Ergodic Capacity of Multi-User MIMO Systems Using Pilot-Based Channel Estimation, Quantized Feedback and Outdated Feedback as Well as User Selection

The authors derive the ergodic channel capacity of a closed-loop MIMO broadcast system under both Random User Selection (RUS) and Semi-orthogonal User Selection (SUS) principles, when considering the effects of channel estimation errors, Channel State Information (CSI) quantization errors and CSI feedback-delay. They intend to answer the question of "How many simultaneous users should be active in a time slot in order to achieve the maximum sum-rate in a MIMO broadcast system?". It is shown that they should refrain from supporting full-rank transmissions due to the excess inter-user interference caused by imperfect CSI at both the receiver and transmitter under RUS.

Provided by: Institute of Electrical & Electronic Engineers Topic: Mobility Date Added: Aug 2012 Format: PDF

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