I have built an OFDM transceiver with rayleigh channel using standard PDP's Like EPA,EVA and ETU.The problem is I am getting very high BER even for BPSK i.e 50-60 % or higher bits in error.Scatterplotting confirms it.My OFDM transceiver blocks include: ---- Random Data -- Modulation(BPSK,QPSK,QAM) -- Serial2Parallel -- IFFT -- CyclicPrefix >>> Rayleigh Ch >>> Remove CP Data---FFT --- Par2Ser ---DeMod --- Sink Data.
I have used builtin matlab function to create Rayleigh channel passing standard PDP as parameter.
channelObj = rayleighchan(tSampling,fDoppler,tau_in_sec,pdb_in_dB);
channelObj.ResetBeforeFiltering=0; % channel remains static before filtering
What I am getting is very high SNR and scattered constellation symbols.Rest of transceiver blocks are simple and all verified as bug free...Do let me how to improve it. How I could get improve BER? Any need of equalizer?Should a match filter would help?Thanks in advance.
NOTE:ONLY RAYLEIGH CHANNEL IS USED AWGN NOISE IS NOT ADDED AT ALL ...