Improved performance of DPSK and NCFSK signals under nonidentical Nakagami fading channels

Authors:
Redha M. Radaydeh;Mustafa M. Matalgah
Affiliations:
The University of Mississippi, University, MS;The University of Mississippi, University, MS
Venue:
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Year:
2006

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Abstract

Square-law combining is the traditional linear combining scheme used in conjunction with noncoherent and differentially coherent modulation/detection systems. For fading scenarios other than identical Rayleigh channels, such as nonidentical Nakagami-m channels, the square-law receiver is suboptimum, and in fact it incurs combining loss (does not aid the use of signal diversity) at relatively low average signal-to-noise ratios (SNRs). To overcome these disadvantages, this paper presents a receiver design with postdetection weighting for differentially coherent phase-shift keying (DPSK) and noncoherent orthogonal frequency shift-keying (NCFSK) signals over nonidentical Nakagami-m channels. It is shown that the proposed receiver is capable of eliminating the noncoherent loss associated with the square-law receiver, and providing improvements on the average error performance, as compared with the square-law receiver, over the whole range of the average (SNRs).