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Adaptive precoding for wireless MIMO broadcast channels with limited feedback

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Authors
Kim, Sungjin; Park, Chang Soon; Kim, Hojin; Lee, Kwang Bok
Issue Date
2005-11
Publisher
Institute of Electronics, Information and Communication Engineers (IEICE)
Citation
IEICE Trans. Commun., vol.E88-B, no.11, pp.4237-4245, Nov. 2005
Keywords
MIMObroadcast channel(BC)adaptive precodingSDR implementation
Description
This paper was presented in part at SPAWC 2005 [1].
Abstract
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
$\mathcal{O}(tr)$ where $r = \sum_{k=1}^K r_k$ and $r_k$ is the
number of antennas at the $k$th 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 \emph{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
$2t^3/L(t^2-t)$, in which $L$ is the number of \emph{active} channel
vectors. Simulation results validate the expectation from the
analysis. In addition, the proposed scheme is shown to be
appropriate for reconfigurable implementation.
ISSN
0916-8516
Language
English
URI
http://search.ieice.org/bin/summary.php?id=e88-b_11_4237&category=B

http://hdl.handle.net/10371/7107
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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