Finite Rate Feedback MIMO Broadcast Channels
نویسنده
چکیده
This paper summarizes recent results on the multiple antenna broadcast (downlink) channel with finite rate feedback of channel state information from each receiver. In this model, the receivers are assumed to have perfect channel knowledge, while the transmitter gains channel knowledge through a finite rate feedback channel from each receiver. The SNR degradation as a function of the feedback rate is computed, as is the feedback rate scaling required to achieve throughput close to that with perfect CSIT. Additionally, it is shown that a small number of antennas per receiver can be used to significantly reduce this required feedback load. Finally, the potential multiuser diversity in finite-rate feedback systems with a large number of users is studied.
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