PROCESSING GAIN IN CDMA


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Spreading gain, or processing gain, is achieved when noise components, or noise-like
components, remain spread when the original signal (user 1 in the figure) is despread.
The original signal appears to have gained energy relative the noise. It can also be seen as if the noise has been suppressed.
By filtering out most of the wideband noise energy the original signal can be extracted,provided sufficient bit energy over noise ratio, Eb/NT. It can be seen that the “signal to noise” ratio after despreading will favor user 1 by a factor of
 G = BW/bw (or Fc/Fb or Tb/Tc).
G is then called spreading gain or processing gain.