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Adaptive Precoding for Wireless MIMO Broadcast Channels with Limited Feedback
James (Sungjin) KIM Hojin KIM Chang Soon PARK Kwang Bok LEE
Publication
IEICE TRANSACTIONS on Communications
Vol.E88B
No.11
pp.42374245 Publication Date: 2005/11/01
Online ISSN:
DOI: 10.1093/ietcom/e88b.11.4237
Print ISSN: 09168516 Type of Manuscript: Special Section PAPER (Special Section on Software Defined Radio Technology and Its Applications) Category: Keyword: MIMO, broadcast channel (BC), adaptive precoding, SDR implementation,
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Summary:
Recently, a number of techniques have been introduced to exploit multiuser diversity of a wireless multipleinput multipleoutput (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 singleuser MIMO CSIT (i.e., it is O(tr) where r = r_{k} and r_{k} 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 multichannel selection diversity (greedy MCSD) scheme based on block MMSE QR decomposition with dirty paper coding (block MMSEDP), where partial CSIT is almost sufficient. The sumrate 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 2t^{3}/L(t^{2}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.

