Exact crossing rates of dual diversity over unbalanced correlated Rayleigh channels

• Published in: IEEE communications letters Vol. 10; no. 1; pp. 37 - 39
• Main Authors: Filho, J.C.S.S., Fraidenraich, G., Yacoub, M.D.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-01-2006; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna measurements; Antennas; Applied sciences; Channels; Correlation; Directive antennas; Distribution functions; Diversity methods; Diversity reception; Exact sciences and technology; Fading; Genetic expression; Level crossings; Mobile antennas; Omnidirectional antennas; Rayleigh channels; Receiving antennas; Stations; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Correlation; Level crossing rate; diversity methods; level-crossing problems; Wireless telecommunication; Rayleigh channels; Diversity
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2006.1576562

General exact expressions for the level crossing rate of dual-branch selection, equal-gain, and maximal-ratio combiners operating over unbalanced correlated Rayleigh channels are derived. Sample numerical results are presented by specializing the general expressions to a space-diversity system with horizontally spaced omnidirectional antennas at the mobile station. It is observed that, whereas power imbalance is invariably prejudicial, fading correlation may be advantageous with closely spaced antennas arranged parallel to the direction of motion.