Cross-Layer combining of adaptive Modulation and coding with truncated ARQ over wireless links
IEEE Transactions on Wireless Communications
On the capacity of MIMO broadcast channels with partial side information
IEEE Transactions on Information Theory
MIMO Broadcast Channels With Finite-Rate Feedback
IEEE Transactions on Information Theory
Multi-Antenna Downlink Channels with Limited Feedback and User Selection
IEEE Journal on Selected Areas in Communications
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In this paper, we focus on the well-known drawback of per user unitary beamforming rate control (PU2RC) that sum throughput severely degrades with a small number of users due to the mismatch between the actual link quality and channel feedback of users. We propose an adaptive channel feedback adjustment (ACFA) method which estimates the actual link quality by adaptively adjusting user feedback according to the number of scheduled users. Numerical results show that the proposed ACFA considerably increases sum throughput of PU2RC especially when the number of users is small.