Title :
Analysis of hybrid selection/maximal-ratio diversity combiners with Gaussian errors
Author :
Annamalai, A. ; Tellambura, C.
Author_Institution :
Bradley Dept. of Electr. & Comput. Eng., Virginia Polytechic Inst. & State Univ., Alexandria, VA, USA
fDate :
7/1/2002 12:00:00 AM
Abstract :
The paper examines the impact of Gaussian distributed weighting errors (in the channel gain estimates used for coherent combination) on both the output statistics of a hybrid selection/maximal-ratio (SC/MRC) receiver and the degradation of the average symbol-error rate (ASER) performance as compared with the ideal case. New expressions are derived for the probability density function, cumulative distribution function and moment generating function (MGF) of the coherent hybrid SC/MRC combiner output signal-to-noise ratio (SNR). The MGF is then used to derive exact, closed-form, ASER expressions for binary and M-ary modulations in conjunction a nonideal hybrid SC/MRC receiver in a Rayleigh fading environment. Results for both selection combining (SC) and maximal-ratio combining (MRC) are obtained as limiting cases. Additionally, the effect of the weighting errors on both the outage rate of error probability and the average combined SNR is investigated. These analytical results provide insights into the tradeoff between diversity gain and combination losses, in concert with increasing orders of diversity branches in an energy-sharing communication system
Keywords :
Gaussian processes; Rayleigh channels; diversity reception; error statistics; modulation; radio receivers; ASER performance; Gaussian distributed weighting errors; M-ary modulation; M-ary signaling; Rayleigh fading; Rayleigh fading channels; SC/MRC receiver; SNR; average combined SNR; average symbol-error rate; binary modulation; channel gain estimates; closed-form expressions; coherent combination; coherent hybrid SC/MRC combiner; combination losses; cumulative distribution function; diversity gain; energy-sharing communication system; error probability; hybrid selection/maximal-ratio diversity combiners; maximal-ratio combining; moment generating function; outage rate; output statistics; probability density function; selection combining; signal-to-noise ratio; weighting errors; Degradation; Distribution functions; Diversity reception; Error analysis; Hybrid power systems; Performance gain; Probability density function; Signal generators; Signal to noise ratio; Statistical distributions;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2002.800548
