raised cosine filter frequency domain

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DongShin Yang 2017-5-3

评论： Saswat Mund 2021-10-27

I am coding raised cosine filter in frequency domain directly.

I do not want to use FFT.

I am coding raised cosine filter in frequency domain directly.

beta=0; % roll off factor fs=10; % sampling factor f=[-10:1/fs:10]; % frequency domain

RC=zeros(1,length(f)); % Raised cosine filter mamory for i=1:1:length(f) if f(i) <= (1-beta)/(2*T) RC(i)=T;

        elseif f(i) > (1-beta)/(2*T) || f(i) <= (1+beta)/(2*T)
            RC(i)=T/2*(1+cos( ((pi*T)/beta) * ( f(i) -(1-beta)/(2*T) ) ) );

　　　　 else RC(i)=0; end end

I made the code. ploting RC was a little wrong. I think

        elseif f(i) > (1-beta)/(2*T) || f(i) <= (1+beta)/(2*T)
            RC(i)=T/2*(1+cos( ((pi*T)/beta) * ( f(i) -(1-beta)/(2*T) ) ) );

was wrong.

Saswat Mund 2021-10-27

replace || with &&

as || reprsents the 'or' while && represents 'and' so for getting frequency spectrum with beta we need to use && as the if else.

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