Raised Cosine Filter in Matlab

Question

Nathan Jaqua 2020-3-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/510921-raised-cosine-filter-in-matlab

回答： Sriram Tadavarty 2020-3-15

We are designing a raised cosine filter in Matlab. I have developed most of the logic for BPSK Transmitter but I could use a little help with finishing it out. Not really sure how to plot this in stem or in scatterplot.

close all; clear all;
% Design BPSK transmitter with the random data bits. 
M =  5;           % Modulation levels (Binary PSK)
k = log2(M);     % number of bits per symbol
N = 2e3;         % total number of random bits
sps = 4;         % number of samples per symbol
EbN0 = 10;       % Eb/N0 level in dB
iBits = rand(N, 1) > 0.5;     % generate random bits
bits = 2*iBits - 1;    % convert modulation symbols
% plot first fifty bits.
figure;
stem(    ); grid on; 
title('Random bits'); xlabel('samples'); ylabel('amplitude');
% Attach the plot here…
 
% plot constellation diagram
scatterplot(  ,1,0,'*r');grid on; 
% Attach the plot here…

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Walter Roberson 2020-3-15

在 MATLAB Online 中打开

bits50 = bits(1:50);
stem(bits50)

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Answer 1

Sriram Tadavarty 2020-3-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/510921-raised-cosine-filter-in-matlab#answer_420199

在 MATLAB Online 中打开

Hi Nathan,

Access the vector bits from 1 to 50 elements and pass as the first argument of stem function.

Then, pass the bits directly to scatterplot.

So, the above code will be as below:

close all; clear all;
% Design BPSK transmitter with the random data bits. 
M =  5;           % Modulation levels (Binary PSK)
k = log2(M);     % number of bits per symbol
N = 2e3;         % total number of random bits
sps = 4;         % number of samples per symbol
EbN0 = 10;       % Eb/N0 level in dB
iBits = rand(N, 1) > 0.5;     % generate random bits
bits = 2*iBits - 1;    % convert modulation symbols
% plot first fifty bits.
figure;
stem(bits(1:50)); grid on; 
title('Random bits'); xlabel('samples'); ylabel('amplitude');
% Attach the plot here…
 
% plot constellation diagram
scatterplot( bits ,1,0,'*r');grid on; 
% Attach the plot here…