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Transmit Power Allocation for Successive Interference Cancellation in Multicode MIMO Systems

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Authors
Park, Chang Soon; Lee, Kwang Bok
Issue Date
2008-12
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
IEEE Trans. Commun., vol. 56, pp. 2200-2213, Dec. 2008
Keywords
Bit error rate (BER)multicode transmissionmultiple-input multiple-output (MIMO) systemssuccessive interferencetransmit power allocation
Description
Paper approved by X. Wang, the Editor for Multiuser Detection and
Equalization of the IEEE Communications Society. Manuscript received June
10, 2005; revised November 2, 2006 and July 23, 2007. This paper was
presented in part at the IEEE International Conference on Communications,
Seoul, Korea, May 2005.
Abstract
Multiple-input multiple-output (MIMO) system
with multicode transmission can provide high speed data services
by transmitting independent parallel substreams from multiple
antennas and through multicode channelization. In this paper,
we first introduce an iterative two-stage successive interference
cancellation (SIC) detection scheme for a multicode MIMO
system. The proposed technique cancels the interference signals
successively in the space domain followed by the code domain.
Next, we develop various transmit power allocation schemes over
different data substreams for the proposed detection process to
improve error rate performance. The joint transmit power allocation
is derived to make the post-detection signal-to-interferenceplus-
noise ratio (SINR) become the same for all substreams
in both the space and code domains. As a computationally
efficient scheme, we propose a two-stage power allocation scheme,
which allocates the total transmit power to the substreams in
the code domain at the first stage, and allocates this code
domain power to the substreams in the space domain at the
second stage. Furthermore, variable and constant power ratio
(PR) schemes are derived to reduce the feedback overhead. In
particular, the constant PR scheme utilizes the transmit power
ratio determined by the long-term statistical properties of the
fading channel amplitudes, and achieves significantly reduced
feedback rate. Numerical results show that the proposed transmit
power allocation schemes for the two-stage SIC significantly
outperform the equal power allocation scheme.
ISSN
0090-6778
Language
English
URI
http://hdl.handle.net/10371/7485
DOI
https://doi.org/10.1109/TCOMM.2008.050064
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Others_전기·정보공학부
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