Title :
Performance of M-PSK with GSC and EGC with Gaussian weighting errors
Author :
Ma, Yao ; Schober, Robert ; Pasupathy, Subbarayan
Author_Institution :
Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
Using a moment-generating function (MGF)-based approach, we study the performance of M-ary phase-shift keying (M-PSK) with generalized selection combining (GSC) and equal gain combining (EGC) in fading channels (including Rayleigh, Rician, Nakagami-m, and Nakagami-q fading) with independent and identically distributed (i.i.d) branches. Analytical expressions for the error and outage probabilities, the signal-to-noise-ratio (SNR) statistics, and the channel capacity of M-PSK diversity receivers are derived, taking into account the effects of Gaussian weighting errors and all relevant system and channel parameters. Unlike the case of perfect channel-state information (CSI), the outage probability for the case of imperfect channel estimation (ICE) is not only a function of the normalized SNR with respect to the SNR threshold, but also a function of the operating SNR itself. The SNR loss of the M-PSK GSC and EGC receivers due to ICE and the relation between the receiver input and output SNRs for ICE are derived. Our results show that, even with ICE, GSC and EGC are effective in improving the output SNR and significantly reduce the error floor and the channel-capacity loss caused by ICE.
Keywords :
Gaussian processes; Rayleigh channels; Rician channels; channel capacity; channel estimation; diversity reception; error statistics; phase shift keying; probability; radio receivers; Gaussian weighting error; M-ary phase-shift keying; Nakagami-g fading channel; Nakagami-m fading channel; Rayleigh fading channel; Rician fading channel; SNR statistics; channel capacity; channel-state information; diversity receiver; equal gain combining; generalized selection combining; imperfect channel estimation; moment-generating function; outage probability; signal-to-noise-ratio; Diversity reception; Fading; Ice; Performance gain; Phase shift keying; Probability; Rayleigh channels; Rician channels; Signal analysis; Signal to noise ratio;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2004.839674