The question about SNR (also referred as S/N, C/N, or (Co+No)/No ) relation to Eb/No typically arises in link budget analysis. E.g. in satcom the demodulator Eb/No threshold for given FEC can be found in datasheet / manual of the unit, while according C/N required to input into the link budget is often unknown.
Here's what I found in page B-2 of manual of CDM600 satellite communications modem by Comtech EFData:
**broken link removed**
• Eb/No and (Co+No)/No are expressed in dB
• Bits/symbol = 1 for BPSK
• Bits/symbol = 2 for QPSK
• Bits/symbol = 3 for 8-PSK
• Bits/symbol = 4 for 16-QAM
S/N = signal to noise ratio.
when E comes in to the picture means enargy and energy = power * time. so the term related to time or 1/time must be included. if we want in decibal then multiplication will be converted in to addition so
we can say that Eb/No(dB) = S/N(dB) + 10*LOG(BW(Hz) / BitRate(Hz))
S. Benedetto, M. Mondin, and G. Montorsi, "Performance Evaluation of
Trellis-Coded Modulation Schemes," Proceedings of the IEEE, Vol. 82, No. 6,
pp. 832-855, June 1994.
On page number 836. I am implementing a BER calculator to M-QAM systems and defronted me with this same problem.
There are other methods, but I believe to QAM this may be OK.
Thanks for the explanation.. but I'm still in doubt about my formula.. if it is correct or not my direct relation between C/N and SNR.
I found the following paper in the page of Rhode & Schwarz but I don't know if I can apply the 1st formula because of the roll-off factor once I'm using DVB-T system.
And I need to be certain of the formula to allow me to compare my results in SNR scale with the DVB-H results I have in C/N scale.
if the SNR and Eb/No is same then why we say better communicatiuon sysytem is with less Eb/No and large S/N is better..
how its possible...........
e?n and SNR is not same.plz comments
please can someone tell me about snr or eb/no in MIMO OFDM, for example i want to compare the performance (ber vs snr) of direct channel ofdm with 2x1 stbc-ofdm. how to make it comparable.