Plotting spectrum of OFDM
조회 수: 24 (최근 30일)
이전 댓글 표시
I am using following code for plotting spectrum of OFDM.
Hs=spectrum.mtm(30);
Pxx=psd(Hs,IFFT_output(:),'Fs',nFFTSize);
plot(Pxx.frequencies+1,10*log10((Pxx.data)),'b');
size of IFFT_output is 128x100 and size of nFFTSize is 128. It works fine. But when I add Cyclic prefix of 32 samples, the size of IFFT_output becomes 160x100. To plot the spectrum of this new variable, should I change nFFTSize.
댓글 수: 0
답변 (1개)
Albatross
2015년 6월 11일
To plot the spectrum of the (OFDM modulated time domain signal + cyclic prefix) you need to change nFFTsize to 160. You can zero pad to 256 if necessary to speed up the fft and then plot the spectrum. To demodulate the received signal correctly, you need to strip out the cyclic prefix first before the fft.
댓글 수: 0
참고 항목
카테고리
Help Center 및 File Exchange에서 OFDM에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!