DocumentCode :
779083
Title :
Reduced-rank signature~receiver adaptation
Author :
Sun, Yakun ; Honig, Michael L.
Author_Institution :
Mobile Devices Bus., Motorola Inc., Libertyville, IL
Volume :
5
Issue :
10
fYear :
2006
Firstpage :
2896
Lastpage :
2902
Abstract :
Interference in code-division multiple access (CDMA) and multi-antenna systems can be avoided by choosing a signature (in space and/or time), which lies in the direction of least interference plus noise. If the interference statistics are unknown a priori, then the signature can be adaptively estimated with a training sequence. We present an iterative scheme for joint signature-receiver adaptation with an adaptive reduced-rank multi-stage Wiener filter (MSWF) at the receiver. We establish convergence of the iterative signature-receiver optimization scheme for a single user with fixed interference, and show that the limiting performance for any filter rank D ges 2 is the same as that obtained with a full-rank receiver. To reduce feedback requirements, we also consider joint signature-receiver adaptation with a reduced-rank signature, which is confined to a randomly chosen subspace. Numerical results are presented for both single- and multi-user (group) adaptation, which show that reduced-rank signature-receiver estimation can achieve near-optimal performance with relatively little training and low complexity
Keywords :
Wiener filters; antenna arrays; code division multiple access; iterative methods; optimisation; radio receivers; radiofrequency interference; CDMA; code-division multiple access; interference statistics; iterative signature-receiver optimization scheme; multiantenna systems; multistage Wiener filter; reduced-rank signature-receiver adaptation; Adaptive algorithm; Convergence; Interference suppression; Limiting; MIMO; Multiaccess communication; Peer to peer computing; Statistics; Sun; Wiener filter;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2006.04648
Filename :
1705951
Link To Document :
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