partypooper
Joined: 11 May 2008
Posts: 1
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 11 May 2008 16:59 SNR to EbNo in OFDM system |
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hey all,
I made an ofdm simulation in matlab, I want it to output Ber/EbNo plot, and I use the awgn function in order to add white noise in the channel, and as u know the awgn function requires SNR as input, so I need to convert from Eb/No to SNR.
I know this:
Es/No(dB)=10log10(Tsymb*Fs)+SNR(dB)
now I need to convert the Es/No of the ofdm signal to Eb/No:
Es/No(dB)=Eb/No(dB)+10log10(Nc*log2(M))+10log10(CodeRate)+10log10(Tinf/(Tinf+Tcp))
where:
M - number of symbols used in the modulation scheme
Nc - number of subcarriers in the ofdm symbol
CodeRate - well..code rate 
Tinf - information period in the ofdm system
Tcp - cyclic prefix period in the ofdm system
(Tcp+Tinf = Tsymbol)
I"m not too sure about the last equation, would like confirmation or correction
thanks
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