775 lines
30 KiB
Matlab
775 lines
30 KiB
Matlab
classdef FFE < handle
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% Implementation of plain and simple FFE.
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% 1) Training mode (stable performance when you use NLMS)
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% 2) Decision directed mode
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%LMS: mu in order of 0.001 for acceptable convergence speed
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%NLMS: mu in order of 0.01 for acceptable convergence speed
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%RLS: mu is lambda -> 0.99 -> 1 (has a strong dependency on this! use a loop to find out best values)
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% FFE("epochs_tr",5,"epochs_dd",2,"len_tr",2^13,"mu_dd",mu_dd,"mu_tr",mu_tr,"order",25,"sps",2,"decide",0, "adaption",adaption_method(adaption),"dd_mode",use_dd_mode);
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% eq_ = FFE("epochs_tr",5,"epochs_dd",5,"len_tr",len_tr, ...
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% "mu_dd",1e-1,"mu_tr",0.4,"order",50, ...
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% "sps",2,"decide",0,"optmize_mus",1,"dd_mode",1, ...
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% "adaption_technique","nlms","mu_dc",1.021e-05);
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properties
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sps % usually 2
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order
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e
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e_tr
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error
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len_tr
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mu_tr
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epochs_tr
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adaption_technique % nlms, lms, rls
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dd_mode % 1 or 0 to set DD-mode on or off
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mu_dd %weight update in dd mode
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epochs_dd
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dd_len_fraction
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mu_dc
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adaptive_dc_enabled
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e_dc
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P % covariance matrix of rls
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constellation % symbol constellation
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decide %wether to return the (hard) decisions or the result after FFE (soft)
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save_debug = 0;
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debug_struct
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optmize_mus = 0;
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mu_optimization
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mu_optimization_iter = 0;
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mu_optimization_len
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plot_mu_optimization = 0;
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mu_optimization_fignum = 3010;
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optimize_dc_params = 0;
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dc_optimization
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dc_optimization_iter = 0;
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dc_optimization_len
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dc_optimization_max_evals
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dc_optimization_delay_weight
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dc_optimization_smoothing_len
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end
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properties (Access = private)
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dc_alpha = 0.98
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dc_gamma = 1e-6
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dc_mu_min = 1e-6
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dc_mu_max = 3e-1
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dc_mu_eff_min = 0
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dc_mu_eff_max = inf
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dc_power_exponent = 1
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end
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methods
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function obj = FFE(options)
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arguments(Input)
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options.sps = 2;
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options.order = 15;
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options.len_tr = 4096;
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options.mu_tr = 0;
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options.epochs_tr = 5;
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options.adaption_technique adaption_method = adaption_method.lms;
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options.dd_mode = 1;
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options.mu_dd = 1e-5;
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options.epochs_dd = 5;
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options.dd_len_fraction = 1;
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options.mu_dc = 0;
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options.adaptive_dc_enabled = false;
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options.decide = false;
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options.save_debug = 0;
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options.optmize_mus = 0;
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options.mu_optimization_len = 2^15;
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options.plot_mu_optimization = 0;
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options.mu_optimization_fignum = 3010;
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options.optimize_dc_params = 0;
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options.dc_optimization_len = 2^15;
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options.dc_optimization_max_evals = 20;
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options.dc_optimization_delay_weight = 1e-3;
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options.dc_optimization_smoothing_len = 501;
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end
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fn = fieldnames(options);
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for n = 1:numel(fn)
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obj.(fn{n}) = options.(fn{n});
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end
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obj.e = zeros(obj.order,1);
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obj.e_dc = 0;
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obj.error = 0;
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end
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function [X,Noi] = process(obj, X, D)
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% actual processing of the signal (steps 1. - 3.)
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% 1 normalize RMS
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X = X.normalize("mode","rms");
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obj.constellation = unique(D.signal);
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obj.e_dc = 0;
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delta = 0.05;
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obj.P = (1/delta) * eye(obj.order);
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if obj.optmize_mus
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obj.optimizeMus(X.signal,D.signal);
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obj.e = zeros(obj.order,1);
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obj.e_dc = 0;
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obj.P = (1/delta) * eye(obj.order);
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end
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if obj.optimize_dc_params
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obj.optimizeDcParams(X.signal,D.signal);
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obj.e = zeros(obj.order,1);
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obj.e_dc = 0;
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obj.P = (1/delta) * eye(obj.order);
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end
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% Training Mode
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training = 1;
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showviz = 0;
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obj.equalize(X.signal, D.signal,obj.mu_tr,obj.epochs_tr,obj.len_tr,training,showviz);
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obj.e_tr = obj.e;
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% Decision Directed Mode
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n = X.length;
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training = 0;
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showviz = 0;
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if obj.dd_mode
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[signal,decision] = obj.equalize(X.signal, D.signal,obj.mu_dd,obj.epochs_dd,n,training,showviz);
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else
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[signal,decision] = obj.equalize(X.signal, D.signal,0,1,n,training,showviz);
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end
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% Output Signal
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if obj.decide
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X.signal = decision;
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else
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X.signal = signal;
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end
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X.fs = D.fs; %change sampling frequency of outgoing signal from fdac e.g. 2 sps to symbol spaced = fsym
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lbdesc = [num2str(obj.order),' tap FFE'];
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X = X.logbookentry(lbdesc); % append to logbook
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Noi = X;
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Noi = X - D;
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end
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function [y,d_hat] = equalize(obj,x,d,mu,epochs,N,training,showviz)
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arguments
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obj
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x
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d
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mu
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epochs
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N
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training
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showviz
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end
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x = [zeros(floor(obj.order/2),1); x; zeros(obj.order,1)];
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lambda = mu;
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if training
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mask = ones(obj.order,1);
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else
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mask = zeros(obj.order,1);
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mask(900:end) = 1;
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mask(ceil(length(obj.e)/2)) = 1;
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end
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mask = ones(obj.order,1);
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maincursor_pos=ceil(length(obj.e)/2);
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always_ideal_decision = 0;
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grad =0;
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weight = 0;
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update = 0;
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if mu == 0 || (~obj.dd_mode && ~training)
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epochs = 1;
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end
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P_err = 0;
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err_prev = 0;
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dc_alpha = obj.dc_alpha;
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dc_gamma = obj.dc_gamma;
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dc_mu_min = obj.dc_mu_min;
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dc_mu_max = obj.dc_mu_max;
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dc_mu_eff_min = obj.dc_mu_eff_min;
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dc_mu_eff_max = obj.dc_mu_eff_max;
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dc_power_exponent = obj.dc_power_exponent;
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debug_enabled = obj.save_debug;
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if debug_enabled
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n_symbols_debug = ceil(N / obj.sps);
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obj.debug_struct.error = NaN(1,n_symbols_debug);
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obj.debug_struct.error_first_epoch = NaN(1,n_symbols_debug);
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obj.debug_struct.main_cursor = NaN(1,n_symbols_debug);
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obj.debug_struct.mu_nlms = NaN(1,n_symbols_debug);
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obj.debug_struct.update_gradient = NaN(1,n_symbols_debug);
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obj.debug_struct.mu_dc_eff = NaN(1,n_symbols_debug);
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obj.debug_struct.e_dc_eff = NaN(1,n_symbols_debug);
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if training
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obj.debug_struct.error_tr = NaN(1,n_symbols_debug);
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obj.debug_struct.update_tr = NaN(1,n_symbols_debug);
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else
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obj.debug_struct.error_dd = NaN(1,n_symbols_debug);
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obj.debug_struct.update = NaN(1,n_symbols_debug);
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end
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end
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for epoch = 1 : epochs
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symbol = 0;
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% obj.e_dc = 0;
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for sample = 1 : obj.sps : N
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symbol = symbol+1;
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mu_dc_eff = 0;
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U = x(obj.order+sample-1:-1:sample);
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y(symbol,1) = obj.e_dc + (obj.e.*mask).' * U; % Calculating output of LMS __ * |
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if training
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d_hat(symbol,1) = d(symbol);
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else
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if ~always_ideal_decision
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[~,symbol_idx] = min(abs(y(symbol) - obj.constellation)); % decision for closest constellation point
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d_hat(symbol,1) = obj.constellation(symbol_idx);
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else
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d_hat(symbol,1) = d(symbol);
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end
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end
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% err(symbol) = y(symbol) - d_hat(symbol); % Instantaneous error
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err(symbol) = d_hat(symbol) - y(symbol); % Instantaneous error
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true_err(symbol) = y(symbol) - d(symbol); % Instantaneous error
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if training || obj.dd_mode
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switch obj.adaption_technique
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case adaption_method.nlms
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% mu used as update weight (suggestion: 0.01-0.05; bit higher during tr)
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normU = ((U.'*U)) + eps;
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weight = mu / normU;
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grad = err(symbol) * U;
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update = grad * weight;
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obj.e = obj.e + update;
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case adaption_method.lms
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% mu used as update weight (suggestion: 0.001)
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weight = mu;
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grad = err(symbol) * U;
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update = grad * weight;
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obj.e = obj.e + update;
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case adaption_method.rls
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% RLS‐Gain:
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denom = lambda + U.' * obj.P * U;
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k = (obj.P * U) / denom;
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% Gewichtsupdate:
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update = k * err(symbol);
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obj.e = obj.e + update;
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% P-Matrix‐Update:
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obj.P = (1/lambda) * (obj.P - k * (U.' * obj.P));
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end
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if obj.mu_dc ~= 0
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if obj.adaptive_dc_enabled
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delta_mu = dc_gamma * err(symbol) * err_prev * (U.'*U);
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obj.mu_dc = min(max(obj.mu_dc + delta_mu,dc_mu_min),dc_mu_max);
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err_prev = err(symbol);
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P_err = dc_alpha*P_err + (1-dc_alpha)*err(symbol)^2;
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mu_dc_eff = obj.mu_dc / ((P_err + eps)^dc_power_exponent);
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else
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mu_dc_eff = obj.mu_dc;
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end
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mu_dc_eff = min(max(mu_dc_eff,dc_mu_eff_min),dc_mu_eff_max);
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obj.e_dc = obj.e_dc + mu_dc_eff * err(symbol);
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end
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end
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%
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% if debug_enabled && epoch == 1
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% obj.debug_struct.error_first_epoch(1,symbol) = err(symbol) * err(symbol)';
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% end
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if debug_enabled && epoch == epochs
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error_power = err(symbol) * err(symbol)';
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update_power = update.'*update ./ (rms(obj.e) + eps);
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obj.debug_struct.error(1,symbol) = error_power;
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obj.debug_struct.main_cursor(1,symbol) = abs(obj.e(maincursor_pos));
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obj.debug_struct.mu_nlms(1,symbol) = weight;
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obj.debug_struct.update_gradient(1,symbol) = grad.'*grad;
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obj.debug_struct.mu_dc_eff(1,symbol) = mu_dc_eff;
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obj.debug_struct.e_dc_eff(1,symbol) = obj.e_dc;
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if training
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obj.debug_struct.error_tr(1,symbol) = error_power;
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obj.debug_struct.update_tr(1,symbol) = update_power;
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else
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obj.debug_struct.error_dd(1,symbol) = error_power;
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obj.debug_struct.update(1,symbol) = update_power;
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end
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end
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end
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end
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end
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function optimizeMus(obj,x,d)
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[x_opt,d_opt,N_opt] = obj.optimizationSignals(x,d);
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switch obj.adaption_technique
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case adaption_method.lms
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mu_range = [1e-5, 1e-2];
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case adaption_method.nlms
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mu_range = [1e-3, 5e-1];
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case adaption_method.rls
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mu_range = [0.98, 0.99999];
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end
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mu_dc_range = [1e-5, 1e-1];
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mu_tr_var = optimizableVariable("mu_tr",mu_range,"Transform","log");
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vars = mu_tr_var;
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if obj.dd_mode
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vars = [vars, optimizableVariable("mu_dd",mu_range,"Transform","log")];
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end
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optimize_mu_dc = obj.mu_dc ~= 0;
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if optimize_mu_dc
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vars = [vars, optimizableVariable("mu_dc",mu_dc_range,"Transform","log")];
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end
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obj.mu_optimization_iter = 0;
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fprintf("FFE mu opt uses %d samples / %d symbols\n",N_opt,numel(d_opt));
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obj.mu_optimization = bayesopt(@(p)obj.muObjective(p,x_opt,d_opt),vars, ...
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"MaxObjectiveEvaluations",20, ...
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"AcquisitionFunctionName","expected-improvement-plus", ...
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"IsObjectiveDeterministic",false, ...
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"Verbose",0, ...
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"PlotFcn",[]);
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obj.mu_tr = obj.mu_optimization.XAtMinObjective.mu_tr;
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if obj.dd_mode
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obj.mu_dd = obj.mu_optimization.XAtMinObjective.mu_dd;
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end
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if optimize_mu_dc
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obj.mu_dc = obj.mu_optimization.XAtMinObjective.mu_dc;
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end
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if obj.dd_mode && optimize_mu_dc
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fprintf("\nFFE mu opt done: mu_tr=%9.3e, mu_dd=%9.3e, mu_dc=%9.3e, BER=%9.3e\n", ...
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obj.mu_tr,obj.mu_dd,obj.mu_dc,obj.mu_optimization.MinObjective);
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elseif obj.dd_mode
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fprintf("\nFFE mu opt done: mu_tr=%9.3e, mu_dd=%9.3e, BER=%9.3e\n", ...
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obj.mu_tr,obj.mu_dd,obj.mu_optimization.MinObjective);
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elseif optimize_mu_dc
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fprintf("\nFFE mu opt done: mu_tr=%9.3e, mu_dc=%9.3e, BER=%9.3e\n", ...
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obj.mu_tr,obj.mu_dc,obj.mu_optimization.MinObjective);
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else
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fprintf("\nFFE mu opt done: mu_tr=%9.3e, BER=%9.3e\n", ...
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obj.mu_tr,obj.mu_optimization.MinObjective);
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end
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if obj.plot_mu_optimization
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obj.plotMuOptimization();
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end
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end
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function optimizeDcParams(obj,x,d)
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[x_opt,d_opt,N_opt] = obj.optimizationSignals(x,d,obj.dc_optimization_len);
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vars = optimizableVariable("mu_dc",[1e-5,1e-1],"Transform","log");
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if obj.adaptive_dc_enabled
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vars = [vars, ...
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optimizableVariable("dc_alpha",[0.85,0.995]), ...
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optimizableVariable("dc_gamma",[1e-7,3e-5],"Transform","log"), ...
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optimizableVariable("dc_power_exponent",[0,1]), ...
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optimizableVariable("dc_mu_eff_max",[1e-3,3e-1],"Transform","log")];
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end
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obj.dc_optimization_iter = 0;
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fprintf("FFE DC opt uses fixed mu_tr=%9.3e, mu_dd=%9.3e on %d samples / %d symbols\n", ...
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obj.mu_tr,obj.mu_dd,N_opt,numel(d_opt));
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obj.dc_optimization = bayesopt(@(p)obj.dcObjective(p,x_opt,d_opt),vars, ...
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"MaxObjectiveEvaluations",obj.dc_optimization_max_evals, ...
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"AcquisitionFunctionName","expected-improvement-plus", ...
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"IsObjectiveDeterministic",false, ...
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"Verbose",0, ...
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"PlotFcn",[]);
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best = obj.dc_optimization.XAtMinObjective;
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obj.mu_dc = best.mu_dc;
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if obj.adaptive_dc_enabled
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obj.dc_alpha = best.dc_alpha;
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obj.dc_gamma = best.dc_gamma;
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obj.dc_power_exponent = best.dc_power_exponent;
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obj.dc_mu_eff_max = best.dc_mu_eff_max;
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fprintf("\nFFE DC opt done: mu_dc=%9.3e, alpha=%6.3f, gamma=%9.3e, p=%5.2f, mu_eff_max=%9.3e, objective=%9.3e\n", ...
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obj.mu_dc,obj.dc_alpha,obj.dc_gamma,obj.dc_power_exponent,obj.dc_mu_eff_max,obj.dc_optimization.MinObjective);
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else
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fprintf("\nFFE DC opt done: mu_dc=%9.3e, objective=%9.3e\n", ...
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obj.mu_dc,obj.dc_optimization.MinObjective);
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end
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end
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function [x_opt,d_opt,N_opt] = optimizationSignals(obj,x,d,opt_len)
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if nargin < 4
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opt_len = obj.mu_optimization_len;
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end
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N_available = min(numel(x),numel(d) * obj.sps);
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if isempty(opt_len) || opt_len <= 0 || isinf(opt_len)
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N_opt = N_available;
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else
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N_opt = min(N_available,max(obj.len_tr,opt_len));
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end
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N_opt = obj.sps * floor(N_opt / obj.sps);
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N_opt = max(obj.sps,N_opt);
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n_symbols = N_opt / obj.sps;
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x_opt = x(1:N_opt);
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d_opt = d(1:n_symbols);
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end
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function objective = muObjective(obj,params,x,d)
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old_debug = obj.save_debug;
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old_mu_dc = obj.mu_dc;
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obj.save_debug = 0;
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has_mu_dc = any(strcmp(params.Properties.VariableNames,"mu_dc"));
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if has_mu_dc
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obj.mu_dc = params.mu_dc;
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||
end
|
||
obj.e = zeros(obj.order,1);
|
||
obj.e_dc = 0;
|
||
obj.P = (1/0.05) * eye(obj.order);
|
||
obj.debug_struct = struct();
|
||
N_tr = min(obj.len_tr,numel(x));
|
||
[signal,~] = obj.equalize(x,d,params.mu_tr,obj.epochs_tr,N_tr,1,0);
|
||
if obj.dd_mode
|
||
[signal,~] = obj.equalize(x,d,params.mu_dd,obj.epochs_dd,numel(x),0,0);
|
||
end
|
||
|
||
[ber,errors] = obj.berObjective(signal,d);
|
||
objective = ber;
|
||
if ~isfinite(objective)
|
||
objective = inf;
|
||
end
|
||
obj.mu_optimization_iter = obj.mu_optimization_iter + 1;
|
||
if obj.dd_mode && has_mu_dc
|
||
fprintf("\rFFE mu opt %02d: mu_tr=%9.3e, mu_dd=%9.3e, mu_dc=%9.3e, BER=%9.3e, errors=%d", ...
|
||
obj.mu_optimization_iter,params.mu_tr,params.mu_dd,params.mu_dc,ber,errors);
|
||
elseif obj.dd_mode
|
||
fprintf("\rFFE mu opt %02d: mu_tr=%9.3e, mu_dd=%9.3e, BER=%9.3e, errors=%d", ...
|
||
obj.mu_optimization_iter,params.mu_tr,params.mu_dd,ber,errors);
|
||
elseif has_mu_dc
|
||
fprintf("\rFFE mu opt %02d: mu_tr=%9.3e, mu_dc=%9.3e, BER=%9.3e, errors=%d", ...
|
||
obj.mu_optimization_iter,params.mu_tr,params.mu_dc,ber,errors);
|
||
else
|
||
fprintf("\rFFE mu opt %02d: mu_tr=%9.3e, BER=%9.3e, errors=%d", ...
|
||
obj.mu_optimization_iter,params.mu_tr,ber,errors);
|
||
end
|
||
obj.save_debug = old_debug;
|
||
obj.mu_dc = old_mu_dc;
|
||
end
|
||
|
||
function objective = dcObjective(obj,params,x,d)
|
||
state = obj.captureObjectiveState();
|
||
cleanup = onCleanup(@()obj.restoreObjectiveState(state));
|
||
|
||
obj.applyDcObjectiveParams(params);
|
||
obj.save_debug = 1;
|
||
obj.e = zeros(obj.order,1);
|
||
obj.e_dc = 0;
|
||
obj.P = (1/0.05) * eye(obj.order);
|
||
obj.debug_struct = struct();
|
||
|
||
N_tr = min(obj.len_tr,numel(x));
|
||
[signal,~] = obj.equalize(x,d,obj.mu_tr,obj.epochs_tr,N_tr,1,0);
|
||
if obj.dd_mode
|
||
[signal,~] = obj.equalize(x,d,obj.mu_dd,obj.epochs_dd,numel(x),0,0);
|
||
end
|
||
|
||
[ber,errors] = obj.berObjective(signal,d);
|
||
[delay_symbols,delay_corr] = obj.dcDelayObjective(signal,d);
|
||
delay_penalty = obj.dc_optimization_delay_weight * abs(delay_symbols) / max(numel(d),1);
|
||
objective = ber + delay_penalty;
|
||
if ~isfinite(objective)
|
||
objective = inf;
|
||
end
|
||
|
||
obj.dc_optimization_iter = obj.dc_optimization_iter + 1;
|
||
if obj.adaptive_dc_enabled
|
||
fprintf("\rFFE DC opt %02d: mu_dc=%9.3e, alpha=%6.3f, gamma=%9.3e, p=%5.2f, mu_eff_max=%9.3e, BER=%9.3e, delay=%7.0f, corr=%6.3f, obj=%9.3e, errors=%d", ...
|
||
obj.dc_optimization_iter,params.mu_dc,params.dc_alpha,params.dc_gamma,params.dc_power_exponent,params.dc_mu_eff_max, ...
|
||
ber,delay_symbols,delay_corr,objective,errors);
|
||
else
|
||
fprintf("\rFFE DC opt %02d: mu_dc=%9.3e, BER=%9.3e, delay=%7.0f, corr=%6.3f, obj=%9.3e, errors=%d", ...
|
||
obj.dc_optimization_iter,params.mu_dc,ber,delay_symbols,delay_corr,objective,errors);
|
||
end
|
||
end
|
||
|
||
function applyDcObjectiveParams(obj,params)
|
||
var_names = string(params.Properties.VariableNames);
|
||
if any(var_names == "mu_dc")
|
||
obj.mu_dc = params.mu_dc;
|
||
end
|
||
if any(var_names == "dc_alpha")
|
||
obj.dc_alpha = params.dc_alpha;
|
||
end
|
||
if any(var_names == "dc_gamma")
|
||
obj.dc_gamma = params.dc_gamma;
|
||
end
|
||
if any(var_names == "dc_power_exponent")
|
||
obj.dc_power_exponent = params.dc_power_exponent;
|
||
end
|
||
if any(var_names == "dc_mu_eff_max")
|
||
obj.dc_mu_eff_max = params.dc_mu_eff_max;
|
||
end
|
||
end
|
||
|
||
function state = captureObjectiveState(obj)
|
||
state.e = obj.e;
|
||
state.e_dc = obj.e_dc;
|
||
state.P = obj.P;
|
||
state.save_debug = obj.save_debug;
|
||
state.debug_struct = obj.debug_struct;
|
||
state.mu_dc = obj.mu_dc;
|
||
state.dc_alpha = obj.dc_alpha;
|
||
state.dc_gamma = obj.dc_gamma;
|
||
state.dc_power_exponent = obj.dc_power_exponent;
|
||
state.dc_mu_eff_max = obj.dc_mu_eff_max;
|
||
end
|
||
|
||
function restoreObjectiveState(obj,state)
|
||
obj.e = state.e;
|
||
obj.e_dc = state.e_dc;
|
||
obj.P = state.P;
|
||
obj.save_debug = state.save_debug;
|
||
obj.debug_struct = state.debug_struct;
|
||
obj.mu_dc = state.mu_dc;
|
||
obj.dc_alpha = state.dc_alpha;
|
||
obj.dc_gamma = state.dc_gamma;
|
||
obj.dc_power_exponent = state.dc_power_exponent;
|
||
obj.dc_mu_eff_max = state.dc_mu_eff_max;
|
||
end
|
||
|
||
function [ber,errors] = berObjective(~,signal,d)
|
||
M = numel(unique(d));
|
||
mapper = PAMmapper(M,0);
|
||
eq_signal_sd = Signal(signal);
|
||
eq_signal_hd = mapper.quantize(eq_signal_sd);
|
||
tx_symbols = Signal(d);
|
||
rx_bits = mapper.demap(eq_signal_hd);
|
||
tx_bits = mapper.demap(tx_symbols);
|
||
[~,errors,ber,~] = calc_ber(rx_bits.signal,tx_bits.signal, ...
|
||
"skip_front",10, ...
|
||
"skip_end",10, ...
|
||
"returnErrorLocation",1);
|
||
end
|
||
|
||
function [delay_symbols,delay_corr] = dcDelayObjective(obj,signal,d)
|
||
delay_symbols = 0;
|
||
delay_corr = 0;
|
||
if ~isfield(obj.debug_struct,"e_dc_eff") || isempty(obj.debug_struct.e_dc_eff)
|
||
return
|
||
end
|
||
|
||
smooth_len = obj.dc_optimization_smoothing_len;
|
||
e_dc_eff_s = movmean(obj.debug_struct.e_dc_eff(:),smooth_len,"omitnan");
|
||
avg_lvl_dc = obj.averageLevelTrace(signal,d,smooth_len);
|
||
|
||
xcorr_len = min(numel(e_dc_eff_s),numel(avg_lvl_dc));
|
||
if xcorr_len < 2
|
||
return
|
||
end
|
||
|
||
inv_dc_xcorr = -e_dc_eff_s(1:xcorr_len);
|
||
avg_lvl_xcorr = avg_lvl_dc(1:xcorr_len);
|
||
inv_dc_xcorr = fillmissing(inv_dc_xcorr,"linear","EndValues","nearest");
|
||
avg_lvl_xcorr = fillmissing(avg_lvl_xcorr,"linear","EndValues","nearest");
|
||
inv_dc_xcorr = inv_dc_xcorr - mean(inv_dc_xcorr,"omitnan");
|
||
avg_lvl_xcorr = avg_lvl_xcorr - mean(avg_lvl_xcorr,"omitnan");
|
||
|
||
if rms(inv_dc_xcorr) <= eps || rms(avg_lvl_xcorr) <= eps
|
||
return
|
||
end
|
||
|
||
[dc_level_xcorr,dc_level_lags] = xcorr(inv_dc_xcorr,avg_lvl_xcorr,"coeff");
|
||
[delay_corr,delay_idx] = max(dc_level_xcorr);
|
||
delay_symbols = dc_level_lags(delay_idx);
|
||
if ~isfinite(delay_corr)
|
||
delay_corr = 0;
|
||
delay_symbols = 0;
|
||
end
|
||
end
|
||
|
||
function avg_lvl_dc = averageLevelTrace(obj,signal,d,smooth_len)
|
||
signal = signal(:);
|
||
d = d(:);
|
||
n_symbols = min(numel(signal),numel(d));
|
||
signal = signal(1:n_symbols);
|
||
d = d(1:n_symbols);
|
||
levels = unique(d);
|
||
avg_for_lvl = NaN(numel(levels),n_symbols);
|
||
|
||
for level_idx = 1:numel(levels)
|
||
level_mask = d == levels(level_idx);
|
||
level_samples = signal(level_mask);
|
||
if isempty(level_samples)
|
||
continue
|
||
end
|
||
|
||
smooth_window = min(smooth_len,numel(level_samples));
|
||
avg_for_lvl(level_idx,level_mask) = movmean(level_samples,smooth_window,"omitnan","Endpoints","shrink");
|
||
avg_for_lvl(level_idx,:) = obj.interpolateMissingAverage(avg_for_lvl(level_idx,:));
|
||
end
|
||
|
||
avg_lvl_dc = mean(avg_for_lvl,1,"omitnan").';
|
||
end
|
||
|
||
function level_average = interpolateMissingAverage(~,level_average)
|
||
valid_samples = isfinite(level_average);
|
||
if nnz(valid_samples) == 0
|
||
return
|
||
elseif nnz(valid_samples) == 1
|
||
level_average(:) = level_average(valid_samples);
|
||
return
|
||
end
|
||
|
||
t = 1:numel(level_average);
|
||
level_average(~valid_samples) = interp1(t(valid_samples),level_average(valid_samples), ...
|
||
t(~valid_samples),"linear","extrap");
|
||
end
|
||
|
||
function plotMuOptimization(obj)
|
||
if isempty(obj.mu_optimization)
|
||
return
|
||
end
|
||
|
||
X = obj.mu_optimization.XTrace;
|
||
objective = obj.mu_optimization.ObjectiveTrace;
|
||
objective = objective(:);
|
||
valid = isfinite(objective);
|
||
|
||
if isempty(X) || ~any(valid)
|
||
return
|
||
end
|
||
|
||
var_names = X.Properties.VariableNames;
|
||
n_vars = numel(var_names);
|
||
eval_idx = (1:numel(objective)).';
|
||
objective_plot = obj.positiveObjectiveForLogPlot(objective);
|
||
best_plot = obj.positiveObjectiveForLogPlot(cummin(objective));
|
||
|
||
figure(obj.mu_optimization_fignum);
|
||
clf;
|
||
t = tiledlayout(2,2,"TileSpacing","compact","Padding","compact");
|
||
title(t,"FFE Bayesian mu optimization");
|
||
|
||
nexttile;
|
||
h_candidate = semilogy(eval_idx,objective_plot,"o-","DisplayName","candidate");
|
||
obj.addOptimizationDataTips(h_candidate,X,objective,objective_plot,eval_idx,var_names);
|
||
hold on;
|
||
h_best_trace = semilogy(eval_idx,best_plot,"k-","LineWidth",1.2,"DisplayName","best so far");
|
||
h_best_trace.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("Evaluation",eval_idx);
|
||
h_best_trace.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("Best BER",best_plot);
|
||
grid on;
|
||
xlabel("Evaluation");
|
||
ylabel("BER");
|
||
legend("Location","best");
|
||
|
||
if n_vars < 2
|
||
return
|
||
end
|
||
|
||
pairs = nchoosek(1:n_vars,2);
|
||
n_pair_plots = min(size(pairs,1),3);
|
||
[~,best_idx] = min(objective);
|
||
|
||
for pair_idx = 1:n_pair_plots
|
||
nexttile;
|
||
x_name = var_names{pairs(pair_idx,1)};
|
||
y_name = var_names{pairs(pair_idx,2)};
|
||
x_data = X.(x_name);
|
||
y_data = X.(y_name);
|
||
c_data = log10(objective_plot);
|
||
|
||
h_scatter = scatter(log10(x_data),log10(y_data),35,c_data,"filled");
|
||
obj.addOptimizationDataTips(h_scatter,X,objective,objective_plot,eval_idx,var_names);
|
||
hold on;
|
||
h_best = plot(log10(x_data(best_idx)),log10(y_data(best_idx)),"kp", ...
|
||
"MarkerSize",12, ...
|
||
"MarkerFaceColor","y", ...
|
||
"DisplayName","best");
|
||
obj.addOptimizationDataTips(h_best,X(best_idx,:),objective(best_idx),objective_plot(best_idx),eval_idx(best_idx),var_names);
|
||
grid on;
|
||
xlabel("log10(" + string(x_name) + ")");
|
||
ylabel("log10(" + string(y_name) + ")");
|
||
cb = colorbar;
|
||
cb.Label.String = "log10(BER)";
|
||
title(string(x_name) + " vs " + string(y_name));
|
||
end
|
||
end
|
||
|
||
function addOptimizationDataTips(~,plot_handle,X,objective,objective_plot,eval_idx,var_names)
|
||
plot_handle.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("Evaluation",eval_idx);
|
||
plot_handle.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("BER",objective);
|
||
plot_handle.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("BER shown",objective_plot);
|
||
|
||
for var_idx = 1:numel(var_names)
|
||
var_name = var_names{var_idx};
|
||
plot_handle.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow(var_name,X.(var_name));
|
||
end
|
||
end
|
||
|
||
function objective_plot = positiveObjectiveForLogPlot(~,objective)
|
||
objective_plot = objective;
|
||
positive_values = objective(isfinite(objective) & objective > 0);
|
||
|
||
if isempty(positive_values)
|
||
floor_value = 1e-12;
|
||
else
|
||
floor_value = min(positive_values) / 10;
|
||
end
|
||
|
||
objective_plot(~isfinite(objective_plot) | objective_plot <= 0) = floor_value;
|
||
end
|
||
end
|
||
end
|