How do I apply a Gaussian pulse shaping filter on a random bit stream using Communications Toolbox?

Question

MathWorks Support Team 2009-6-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/95820-how-do-i-apply-a-gaussian-pulse-shaping-filter-on-a-random-bit-stream-using-communications-toolbox

回答： Tasos Giannoulis 2017-1-25

采纳的回答： MathWorks Support Team

I want to do a Gaussian pulse shaping of a binary signal.

请先登录，再回答此问题。

Answer 1

MathWorks Support Team 2009-6-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/95820-how-do-i-apply-a-gaussian-pulse-shaping-filter-on-a-random-bit-stream-using-communications-toolbox#answer_105172

在 MATLAB Online 中打开

The ability to apply a Gaussian pulse shaping filter on a signal is not available in Communications Toolbox.

As a workaround, you may use the GAUSSFIR function in the Signal Processing Toolbox. The following example demonstrates how this can be done.

%%Signal Source
% Build a set of test data.
x = randint(5,1);
x = x*2 -1;
rxsig = upsample(x,33); % Upsampled signal
rxsig = [zeros(16,1); rxsig];
stem(rxsig); hold on
%%Setup
% Define parameters.
bt = 0.3;
o=8;
n = 2;
%%Filter Definition
% Define filter-related parameters.
h = gaussfir(bt,n,o) ;
%%Filter the Signal
% y = filter(h,1,rxsig)/(h*h'); %Scaling by energy
y = filter(h,1,rxsig)/(max(h)); %Scaling by magnitude
plot(y(17:end, :), 'r');hold off;
legend('Upsampled Binary Signal','After Pulse Shaping')
%%Plot the impulse response of the Gaussian Filter
figure;impz(h);

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Tasos Giannoulis 2017-1-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/95820-how-do-i-apply-a-gaussian-pulse-shaping-filter-on-a-random-bit-stream-using-communications-toolbox#answer_251887

在 MATLAB Online 中打开

Alternatively, you can construct an FIR Gaussian filter using dsp.FIRFilter (from DSP System Toolbox) and gaussdesign (from Signal Processing Toolbox):

bt = 0.3;
span = 4;
sps = 4;
num = gaussdesign(bt, span, sps);
gaussianFilter = dsp.FIRFilter('Numerator', num);
filtered = gaussianFilter(yourSignal);