PSK Combiners for Fading Microwave Channels
Kamilo Feher, D. Chan · IRE Transactions on Communications Systems · 1975
The signal-to-noise(S/N)ratio of digital signals can be improved by using diversity transmission, followed by combining at the receive end, resulting in a lower probability of errorP(e). Second-order combining schemes for data signals are presented in this paper. The effect of delay difference in the two channels of a diversity system is analyzed, using four-phase coherent, phase-shift keying (PSK) as an example. For comparison with predicted performance, experimental results are included.