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The performance of the maximum ratio combining method in correlated rician-fading channels for antenna-diversity signal combining

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1 Author(s)
Hon Tat Hui ; Sch. of Inf. Technol. & Electr. Eng., Univ. of Queensland, Australia

The performance of the maximum ratio combining method for the combining of antenna-diversity signals in correlated Rician-fading channels is rigorously studied. The distribution function of the normalized signal-to-noise ratio (SNR) is expanded in terms of a power series and calculated numerically. This power series can easily take into account the signal correlations and antenna gains and can be applied to any number of receiving antennas. An application of the method to dual-antenna diversity systems produces useful distribution curves for the normalized SNR which can be used to find the diversity gain. It is revealed that signal correlation in Rician-fading channels helps to increase the diversity gain rather than to decrease it as in the Rayleigh fading channels. It is also shown that with a relative strong direct signal component, the diversity gain can be much higher than that without a direct signal component.

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Antennas and Propagation, IEEE Transactions on  (Volume:53 ,  Issue: 3 )