NDLI: Efficient Soft-Output Demodulation of MIMO QPSK via Semidefinite Relaxation

Content Provider	IEEE Xplore Digital Library
Author	Nekuii, M. Kisialiou, M. Davidson, T.N. Zhi-Quan Luo
Copyright Year	2007
Abstract	Two efficient list-based “soft”-output demodulators are developed for iterative receivers in multiple-input multiple-output (MIMO) communication systems with QPSK signaling. The proposed demodulators are based on the semidefinite relaxation (SDR) technique, and hence their computational costs are bounded by a low-order polynomial of the number of bits transmitted per channel use. The first demodulator applies the SDR technique once per demodulation-decoding iteration, and generates list members via the randomization procedure that is inherent in the SDR technique. The second demodulator is based on an approximation of that randomization procedure by a set of independent Bernoulli trials, and this approximation reduces the number of semidefinite programs that need to be solved to just one per channel use. List-free implementations that reduce the memory requirements of list demodulators with moderate to long lists are also developed. Analysis suggests that the proposed “Single-SDR” demodulator should offer good performance at moderate computational cost, especially for larger systems. This is quantified using simulations of a richly scattered environment, in which the performance of the Single-SDR demodulator is similar to that of the list sphere decoder with moderate sized lists and better than that of the minimum mean square error soft interference canceler. The average computational cost of a straightforward implementation of the Single-SDR demodulator is competitive with that of the list sphere decoder with moderate sized lists, and the distribution of its computational cost is quite concentrated around the average.
Sponsorship	IEEE Signal Processing Society
Starting Page	1426
Ending Page	1437
Page Count	12
File Size	1622009
File Format	PDF
ISSN	19324553
Volume Number	5
Issue Number	8
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Demodulation Approximation methods Computational efficiency MIMO Phase shift keying Relaxation methods soft-output demodulation Iterative demodulation and decoding (IDD) multiple-input multiple-output (MIMO) communication multiuser detection semidefinite relaxation
Content Type	Text
Resource Type	Article
Subject	Signal Processing Electrical and Electronic Engineering

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