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QPSK Simulation/Gray Coding/Rayleigh Fading

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This m-file shows a baseband simulated version of QPSK with Gray coding (Rayleigh fading and AWGN ad

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Editor's Note: Popular File 2009

QPSK with Gray coding BER/SER plots are simulated using Rayleigh fading combined with AWGN.

Comments and Ratings (6)

WAHHAB

WAHHAB (view profile)

allen allen

thank you for this coding

BER using convolutional coding with QPSK and 16QAM modulations in an AWGN and Rayleigh channels as a function of the average SNR (i.e. average ES/N0). The (punctured) convolutional code is the one standardized in IEEE 802.16 with a polynomial generators of {133o, 171o}, constraint length L=7 and a native code rate r=1/2.

Mak

Mak (view profile)

Hi, krishna ..
i have been working on viterbisim.m which is a built-in matlab example for understanding the ber tool.. i that i have tried to change the code rate to 2/3 with trellis structure of
t = poly2trellis([5 4],[23 35 0; 0 5 13]); but output ber graph is completely unexpected n highly fluctuated.. i m not working on simulink ..plz help me how can i resolve this issue ..
basically my project is on mimo-ofdm so far i have done ofdm transceiver which works ok without rayleigh which is like this
data source ->FEC(2/3)->qpsk->ofdm ......but i need to send bits in a loop for more accurate ber that is i dont have to guess in advance ! thats y i m working on viterbisim.m... plz help m i have hardly got 2months to submit it ...
thanks in advance

sachin bisen

itss nice

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