Diversity reception of binary NCFSK through Nakagami fading channels and additive white Gaussian noise using ideal switched diversity is considered. Identical as well as different branch parameters are assumed. The effect of correlation among the branch fadings is also considered.

The performances of parametric receivers such as the linear, the maximum likelihood and the hard limiter have been analyzed before for the detection of frequency-hopped multilevel frequency-shift keyed signals (FH-MFSK) in mobile radiotelephony. Also, nonparametric receivers such as the maximum rank sum receiver (MRSR) and the reduced rank sum receiver (RRR) were previously considered. Here, a receiver called the mean level receiver (MLR) is analyzed. It is neither parametric nor nonparametric. It depends on the noise (or interference) distribution except for a scale parameter which may correspond to the noise power. The proposed receiver is distinguished by its easier implementation, constant false alarm rate and relatively good performance.