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WIP - implementation and debugging of 224 Gbd PAM4 system

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This commit is contained in:
Silas Oettinghaus
2023-05-17 14:47:56 +02:00
parent c8f1ee17e9
commit 8d098a6c80
12 changed files with 274 additions and 254 deletions
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53
Classes/Filter.m
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@@ -6,13 +6,15 @@ classdef Filter
H
filterType
f_cutoff
lowpass
signal_length
filtdegree
passband_ripple
passband_ripple
stopband_ripple
fsamp
w
end
methods
@@ -20,36 +22,34 @@ classdef Filter
%FILTER Construct an instance of this class
% Detailed explanation goes here
arguments
options.filterType = 1;
options.filterType filtertypes = filtertypes.bessel_inp ;
options.f_cutoff = 0;
options.fsamp = 0;
options.filtdegree = 3;
options.passband_ripple = 0.5;
options.stopband_ripple = 0.5;
options.lowpass = 1;
end
obj.filterType = options.filterType;
obj.f_cutoff = options.f_cutoff;
obj.filtdegree = options.filtdegree;
obj.passband_ripple = options.passband_ripple;
obj.stopband_ripple = options.stopband_ripple;
obj.fsamp = options.fsamp;
fn = fieldnames(options);
for n = 1:numel(fn)
obj.(fn{n}) = options.(fn{n});
end
end
function signalclass_out = process(obj,signalclass_in)
function signalclass_out = process(obj,signalclass_in)
% actual processing of the signal
signalclass_in.signal = obj.process_(signalclass_in.signal);
% actual processing of the signal
signalclass_in.signal = obj.process_(signalclass_in.signal);
% append to logbook
% append to logbook
filterdesc = [num2str(obj.filtdegree),'. order ',char(obj.filterType),' filter with f_cutoff at ', num2str(obj.f_cutoff*1e-9), ' GHz.'];
signalclass_in = signalclass_in.logbookentry(filterdesc);
% write to output
% write to output
signalclass_out = signalclass_in;
end
@@ -58,7 +58,7 @@ classdef Filter
obj.signal_length = length(xin);
obj.H = obj.buildFilter(obj.filterType);
[obj.H,obj.w] = obj.buildFilter(obj.filterType);
yout = obj.applyFilter(xin);
@@ -70,8 +70,8 @@ classdef Filter
end
function H = buildFilter(obj,filterType)
function [H,w] = buildFilter(obj,filterType)
w = [];
rp = obj.passband_ripple; %passband ripple
rs = obj.stopband_ripple; %stopband ripple
@@ -143,9 +143,22 @@ classdef Filter
B = wc*sinc(wc*(-g:g));
A=1;
case 10
% Gaussian Filter
%check if order ist multiple of 1/2
blocklen=obj.signal_length;
faxis=linspace(-obj.fsamp/2,obj.fsamp/2,blocklen+1)';%generates arow vector faxis of blocklen+1 points linearly spaced between and including -para.fs/2 and para.fs/2
faxis=ifftshift(faxis(1:end-1));
H=exp(-((faxis)/(obj.f_cutoff*2)).^(2*obj.filtdegree)*log(2)*2^(2*obj.filtdegree-1));
end
H = freqz(B, A, obj.signal_length,'whole');
% Build Filter from coefficients
if filterType ~= 10
[H,w] = freqz(B, A, obj.signal_length,'whole');
end
end
end