Coherent averaging method (also known as time-synchronous averaging) is used to increase the signal-to-noise radio (SNR). The technique is very well described in the book of Richard G. Lyons “Understanding Digital Signal Processing”, chapter 11. The achievable results can be summarized as follows.
The SNR gain coefficient equals:
SNRcoh = SQRT(N)
or as as logarithm value:
SNR cohgain (dB) = 20 * log10 (SNRcoh)=20*log10 (SQRT (N)) = 10 * log10 (N)
where N is a number of receivers.
You can make all types of the coherent averaging experiments using our coherent receivers.