Performance analysis of scheduled TAS with MRC in the presence of non-identically delayed feedback channels
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This paper studies the performance of a scheduled transmit antenna selection (TAS) with maximal ratio combining (MRC) in the presence of non-identically delayed feedback channels. This paper derives the probability density function of the scheduled TAS with MRC under non-identical feedback delay channels. Using the distribution, this paper derives exact closed-form expressions of the scheduled TAS with MRC for the outage probability and symbol error rate (SER) with M-ary phase shift keying and quadrature amplitude modulation as well as the ergodic capacity under the non-identical feedback delay channels. We also quantify the diversity order of the outage probability and SER. The asymptotic results show that the receive antenna diversity is only available under non-identical feedback delay channels, while the multi-user diversity and transmit spatial diversity are diminished compared to the perfect channel environment. Further, the performance of the scheduled TAS with MRC in the presence of non-identical feedback delay is significantly improved by the number of receive antennas, while the impact of the number of transmit antennas or correlation coefficients of feedback delay is insignificant.
KeywordsTransmit antenna selection Non-identically delayed feedback channels Scheduling SER Outage probability Diversity order Capacity
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