In this paper, we investigate the diversity performance of multi-cell multi-user multiple-input multiple-output wireless system with linear minimum mean-squared error receiver. We consider imperfect channel state information at the receiver, and in particular we focus on the effect of pilot contamination. With the equivalent channel model, we study the outage probability of the uplink transmission, and mathematically analyze the diversity performance. We successfully derive the closed-form expression of the outage probability in finite signal to noise ratio (SNR) regime, and then the optimal pilot-to-data power ratio is studied. It is proved that due to pilot contamination, diversity gain approaches to zero with the SNR growing to positive infinite.
Wireless Personal Communications – Springer Journals
Published: Apr 27, 2017
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