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Switch-and-Examine Diversity Over Arbitrarily Correlated Nakagami- m Fading Channels

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3 Author(s)
Alexandropoulos, G.C. ; Dept. of Comput. Eng. & Inf., Univ. of Patras, Rio-Patras, Greece ; Mathiopoulos, P.T. ; Sagias, N.C.

The performance of switch-and-examine diversity (SED) over L arbitrarily correlated and not necessarily identically distributed Nakagami-m fading channels is studied. Analytical expressions for the distribution of the SED output signal-to-noise ratio (SNR) are obtained for the constant correlation model. For the most general case of arbitrary correlation, by assuming half-integer or integer values for the fading parameter m, analytical expressions for the distribution of the output SNR with L ?? 3 are derived. Moreover, for L > 3, analytical approximations for the output SNR are presented. The derived expressions are used to study the outage and average symbol error probability of SED receivers. Performance results obtained by numerical evaluation and verified by means of computer simulations show that the performance of the receivers under consideration is degraded with increasing branch correlation. Nevertheless, SED receivers outperform uncorrelated switch-and-stay diversity receivers, even when they operate under high branch correlation.

Published in:

Vehicular Technology, IEEE Transactions on  (Volume:59 ,  Issue: 4 )

Date of Publication:

May 2010

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