Title :
CINR difference analysis of optimal combining versus maximal ratio combining
Author :
Burke, J.P. ; Zeidler, J.R. ; Rao, B.D.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of California, San Diego, CA, USA
Abstract :
The statistical gain differences between two common spatial combining algorithms: optimum combining (OC) and maximal ratio combining (MRC) are analyzed using a gain ratio method. Using the receive carrier-to-interference plus noise ratio (CINR), the gain ratio ClNROC /CINRMRC is evaluated in a flat Rayleigh fading communications system with multiple interferers. Exact analytical solutions are derived for the probability density function (PDF) and the average gain ratio with one interferer. When more than one interferer is present, the PDF of the gain ratio is illustrated using Monte Carlo simulations and its mean value is shown in basic integral form. An upper bound to the gain ratio is derived providing a simple means to determine when OC will exhibit significant gains over MRC.
Keywords :
Monte Carlo methods; Rayleigh channels; diversity reception; integral equations; probability; radiofrequency interference; statistical analysis; CINR difference analysis; Monte Carlo simulation; flat Rayliegh fading communication system; gain ratio method; maximal ratio combining; optimal combining; probability density function; receive carrier-to-interference plus noise ratio; spatial combining algorithm; Algorithm design and analysis; Bit error rate; Colored noise; Diversity reception; Fading; Interference; Signal to noise ratio; Speech analysis; Upper bound; Wireless communication;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2004.840241
