DocumentCode :
2431273
Title :
Linear precoders for multiuser MIMO for finite constellations and a simplified receiver structure under controlled interference
Author :
Ghaffar, Rizwan ; Knopp, Raymond
Author_Institution :
Eurecom, Sophia Antipolis, France
fYear :
2009
fDate :
1-4 Nov. 2009
Firstpage :
1431
Lastpage :
1435
Abstract :
This paper is an extension to the earlier proposed idea of exploiting the discrete constellation alphabets in linear precoding for the downlink of multiuser (MU) MIMO. In the earlier work, it was shown that the transmission of controlled interference to the users bears the potential of exploiting the interference structure in improving the error resilience. In this paper we propose a linear precoding strategy for the downlink of multiuser MIMO on the idea of controlled interference. However under the controlled interference, intuitive optimal receiver is Maximum Likelihood (ML) detector which would require an exhaustive search of the controlled interferers. It would have exponential search complexity in the number of users and their constellation sizes. We further propose in this paper a simplified receiver structure which exploits the interference structure by ML detection but its complexity is equivalent to that of a receiver that confronts no interference (in two user case). Monte Carlo simulations show the improved performance of the proposed linear precoding strategy relative to the existing linear precoding schemes.
Keywords :
MIMO communication; Monte Carlo methods; linear codes; maximum likelihood detection; multi-access systems; precoding; radio receivers; Monte Carlo simulation; controlled interference; controlled interferer; discrete constellation alphabet; finite constellations; intuitive optimal receiver; linear precoder; maximum likelihood detector; multiuser MIMO; simplified receiver structure; Broadcasting; Channel capacity; Communication systems; Downlink; Gaussian channels; Interference; MIMO; Maximum likelihood detection; Mutual information; Optimal control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Signals, Systems and Computers, 2009 Conference Record of the Forty-Third Asilomar Conference on
Conference_Location :
Pacific Grove, CA
ISSN :
1058-6393
Print_ISBN :
978-1-4244-5825-7
Type :
conf
DOI :
10.1109/ACSSC.2009.5469845
Filename :
5469845
Link To Document :
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