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Advisor(s)
Abstract(s)
This paper addresses the performance analysis of an adaptive wireless link with one antenna transmitter and a multiple antenna
maximum-ratio combining (MRC) receiver. Two main assumptions are used in this paper: (1) Rayleigh fading correlated channels
(i.e., MRC branch correlation) and (2) imperfect (outdated) channel state information at the transmitter (CSIT) side. he main
contribution of this work lies in the derivation of analytic expressions (in terms of a series expansion) of the statistics of correct
packet reception conditional on the decisions made by the transmitter based on outdated CSIT. he novelty of this derivation is
the joint modelling of spatially correlated branches, imperfect CSIT, and adaptive modulation based on threshold-trigger decision.
Contrary to common belief, the results presented here suggest that spatial correlation not always afects the performance of the
MRC receiver: at low signal-to-noise ratio (SNR), correlation can improve performance rather than degrading it. In contrast, at
high SNR, correlation is found to always degrade performance. At high SNR, correlation tends to worse the degrading efects of
imperfect CSIT, particularly when the number of antennas increases. Imperfect CSIT causes errors in the assignment of MCSs,
thus reducing throughput performance. hese errors become more evident in the high SNR regime, particularly when the values
of branch correlation and the number of antennas increase.