Ambiguity in Eb/N0 vs BER plot

I want to plot Eb/N0 vs BER bpsk demodulation in Matlab. I am using BPSK
modulated signal @ carrier frequencey 8KHz, data rate 1KHz. Sampling rate
is set
I have tried to use awgn function for adding noise. This signal accepts
Signal to noise ratio (SNR)in parameters. In order to convert into Eb/N0
for BPSK signal. I have used following relation
         SNR = Eb/N0 + 10log(R/B) (This formula i have seen for Base Band
signal does it work for band pass as well)
R=data rate (1KHz in our case)
B= channel width (I have found in some literature that B=sampling
rate=96000Hz in our case)
For Eb/ N0=0 dB SNR appears to be -19.22dB 
When I plot Eb/No using these values, result differ from ideal bpsk plot
Can anybody suggest mistake in this procedure? 
Thanks,
Avais

> For Eb/ N0=0 dB SNR appears to be -19.22dB
> When I plot Eb/No using these values, result differ from ideal bpsk plot
> Can anybody suggest mistake in this procedure?
> Thanks,
> Avais

sorry i don't have more details but i recall that you may need a 3 dB
correction between passband and baseband versions

Mark