118 lines
3.2 KiB
Matlab
118 lines
3.2 KiB
Matlab
classdef PAMsource
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%NAME Summary of this class goes here
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% Detailed explanation goes here
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properties(Access=public)
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order
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useprbs
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M
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fsym
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randkey
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applypulseform
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pulseformer
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fs_out
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applyclipping
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clipfactor
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end
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methods (Access=public)
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function obj = PAMsource(options)
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%NAME Construct an instance of this class
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% Detailed explanation goes here
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arguments
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options.order = 16;
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options.useprbs = true;
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options.M = true
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options.fsym = 112e9;
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options.randkey = 0;
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options.applypulseform = 1;
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options.pulseformer Pulseformer;
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options.fs_out ;
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options.applyclipping = 0;
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options.clipfactor = 10;
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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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try
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obj.(fn{n}) = options.(fn{n});
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end
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end
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if boolean(obj.applypulseform) && isempty(obj.pulseformer)
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warning('No Pulseformer given. Proceeding with RRC and alpha 0.05');
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options.pulseformer = Pulseformer("fsym",obj.fsym,"fdac",obj.fs_out,"pulse","rrc","pulselength",16,"rrcalpha",0.05);
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end
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end
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function [digi_sig,symbols,bits] = process(obj)
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%%%%% PRBS Generation in correct shape for Modulation Format %%%%%%
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O = obj.order; %order of prbs
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N = 2^(O-1); %length of prbs
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[~,seed] = prbs(O,1); %initialize first seed of prbs
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bitpattern=[];
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if obj.useprbs
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for i = 1:log2(obj.M)
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[bitpattern(:,i),seed] = prbs(O,N,seed);
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end
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else
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s = RandStream('twister','Seed',obj.randkey);
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for i = 1:log2(obj.M)
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bitpattern(:,i) = randi(s,[0 1], N, 1);
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end
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end
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if obj.M == 6
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bitpattern = reshape(bitpattern,[],1);
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bitpattern = bitpattern(1:end-mod(length(bitpattern),5));
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end
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bits = Informationsignal(bitpattern);
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symbols = PAMmapper(obj.M,0).map(bits);
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symbols.fs = obj.fsym;
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if obj.applyclipping
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sym_min = min(symbols.signal);
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sym_max = max(symbols.signal);
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end
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%%%%% Pulseforming %%%%%%
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if obj.applypulseform
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digi_sig = obj.pulseformer.process(symbols);
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else
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digi_sig = symbols;
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end
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%%%%% Resample to f DAC %%%%%%
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digi_sig = digi_sig.resample("fs_in",digi_sig.fs,"fs_out",obj.fs_out,"n",10,"beta",5);
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%%%%% Hard clip digital signal to PAM range before DAC %%%%%%
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if obj.applyclipping
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digi_sig.signal = clip(digi_sig.signal , sym_min * obj.clipfactor , sym_max * obj.clipfactor);
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end
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% append to logbook
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lbdesc = ['Generated PAM Signal'];
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digi_sig = digi_sig.logbookentry(lbdesc);
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end
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end
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end
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