# Tag Info

what is the price you pay for this bit rate increase? The price you pay according to Shannon-Hartley Theorem is SNR. You need a much higher SNR (S/N) or Eb/No ratio to compress more Bits/baud. $~~~~@~BER=10^{-5}$ Eb/No QAM [dB] ---- --- 4 9.5 16 13.0 (+3.5) 64 17.5 (+4.5) 256 22.5 (+5.0) For Gaussian Noise you can ...