Hi all, I tried to simulate the bit error rate performance using bpsk with convolutional code: R=1/2, K=7, generator polynomials (133,171) in AWGN and the performance using bpsk ofdm with the code in AWGN. I got the same ber curve for both cases, which showed some advantage or gain after using the coding However, when I simulated the bpsk ofdm system using the conv. code in flat rayleigh, I didn't see any improvement and the plot was pretty much parallel with the ber curve of bpsk in flat rayleigh. But when I used the conv.code with bpsk only in flat rayleigh, I saw some improvement (gain). I supposed I should get the same ber performance for both cases in flat rayleigh, right? Anyone has suggestions over this issue? Thanks very much. Yohan
Conv. coding with ofdm in flat rayleigh
Started by ●July 27, 2006
Reply by ●July 28, 20062006-07-28
>Hi all, > >I tried to simulate the bit error rate performance using bpsk with >convolutional code: R=1/2, K=7, generator polynomials (133,171) in AWGN >and the performance using bpsk ofdm with the code in AWGN. I got thesame>ber curve for both cases, which showed some advantage or gain afterusing>the coding > >However, when I simulated the bpsk ofdm system using the conv. code in >flat rayleigh, I didn't see any improvement and the plot was pretty much >parallel with the ber curve of bpsk in flat rayleigh. > >But when I used the conv.code with bpsk only in flat rayleigh, I sawsome>improvement (gain). I supposed I should get the same ber performance for >both cases in flat rayleigh, right? > >Anyone has suggestions over this issue? Thanks very much. > >Yohan > > >I would first check if Eb/N0 is calculated correctly in the Rayleigh case.