Abstract
Efficient use of the radio spectrum is becoming increasingly important since terrestrial and satellite communication needs have placed an increasing burden on the available RF bands. In this paper we determine the detection efficiency of QAM when it is corrupted by Gaussian noise and one or more constant-envelope or amplitude-modulated cochannel interferers. Since the exact method we present involves the summation of an infinite series, upper and lower bounds, which are exponential functions and which are tight for high SNR, are given. Error probability and detection efficiency for 16-ary QAM, 8- and 16-PSK have been evaluated and compared. Cochannel interference immunity of 16-QAM is inferior to that of 8-PSK, but superior to that of 16-PSK.
Published Version
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