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IEICE TRANSACTIONS on Communications

Adaptive Precoding for Wireless MIMO Broadcast Channels with Limited Feedback

James (Sungjin) KIM, Hojin KIM, Chang Soon PARK, Kwang Bok LEE

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Summary :

Recently, a number of techniques have been introduced to exploit multiuser diversity of a wireless multiple-input multiple-output (MIMO) broadcast channel (BC) that consists of a base station with t transmit antennas and K users with multiple antennas. However, prior works have ignored the rate overhead associated with feedback of MIMO BC channel state information at transmitter (CSIT), which is roughly K times larger than single-user MIMO CSIT (i.e., it is O(tr) where r = rk and rk is the number of antennas at the kth user). Considering the amount of feedback signaling, quantization is a necessity for effective feedback transmission as a form of partial CSIT. In this paper, we propose the greedy multi-channel selection diversity (greedy MCSD) scheme based on block MMSE QR decomposition with dirty paper coding (block MMSE-DP), where partial CSIT is almost sufficient. The sum-rate performance of our novel scheme approaches extremely close to the sum capacity of MIMO BC as the number of users increases, whereas the feedback overhead is reduced by a factor of 2t3/L(t2-t), in which L is the number of active channel vectors. Simulation results validate the expectation from the analysis. In addition, the proposed scheme is shown to be appropriate for reconfigurable implementation.

Publication
IEICE TRANSACTIONS on Communications Vol.E88-B No.11 pp.4237-4245
Publication Date
2005/11/01
Publicized
Online ISSN
DOI
10.1093/ietcom/e88-b.11.4237
Type of Manuscript
Special Section PAPER (Special Section on Software Defined Radio Technology and Its Applications)
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