commworld said:hi..
can nyone pls show me snr vs ber plot for OFDM in awgn channel for 4-QAM.
modulation.
I got the plot but I fear its wrong, m getting prob. of error = 10^-3 at 24db..!!
plz gv a rply...:|
commworld said:ya u two r rite... i dono wer I am mistakening..
I added awgn to the ofdm signal which is made up of 58 ofdm symbols=ofdm_strm
xt=ofdm_strm;
xt=awgn(xt,n);
then I did the reverse process of removal of CP, fft and then demodulation.
then I converted bak the decimal values to binary values... and compared it with my transmitted bit sequence to calculate the BER
[error, pe]=biterr(rx_bit,dat_strm);
then for 40 values of SNR/EbNo I calculated Pe and ploted it
semilogy(EbNo,Pe,'k*-');
plz tel me what step m I missing..
I verified all my functions of ofdm demodulation are working correctly..
I ve attached the plot...
in my code i generated random noise for every snr (for loop use)
then gaussian noise would be n=sqrt(1/(snr))*randn(1,(2*N+Ncp)))
where N is the num of subcarriers and Ncp the cyclic prefix. hope this helps
i just want to design an LTE transciver based
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