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Asynchronous interference mitigation in cooperative base station systems

Zhang, Hongyuan; Mehta, Neelesh B.; Molisch, Andreas LU ; Zhang, Jin and Dai, Huaiyu (2008) In IEEE Transactions on Wireless Communications 7(1). p.155-165
Abstract
Cooperative transmission by base stations (BSs) can significantly improve the spectral efficiency of multiuser, multicell, multiple input multiple output (MIMO) systems. We show that contrary to what is often assumed in the literature, the multiuser interference in such systems is fundamentally asynchronous. Intuitively, perfect timing-advance mechanisms can at best only ensure that the desired signal components - but not also the interference components - are perfectly aligned at their intended mobile stations. We develop an accurate mathematical model for the asynchronicity, and show that it leads to a significant performance degradation of existing designs that ignore the asynchronicity of interference. Using three previously proposed... (More)
Cooperative transmission by base stations (BSs) can significantly improve the spectral efficiency of multiuser, multicell, multiple input multiple output (MIMO) systems. We show that contrary to what is often assumed in the literature, the multiuser interference in such systems is fundamentally asynchronous. Intuitively, perfect timing-advance mechanisms can at best only ensure that the desired signal components - but not also the interference components - are perfectly aligned at their intended mobile stations. We develop an accurate mathematical model for the asynchronicity, and show that it leads to a significant performance degradation of existing designs that ignore the asynchronicity of interference. Using three previously proposed linear precoding design methods for BS cooperation, we develop corresponding algorithms that are better at mitigating the impact of the asynchronicity of the interference. Furthermore, we also address timing-advance inaccuracies (jitter), which are inevitable in a practical system. We show that using jitter-statistics-aware precoders can mitigate the impact of these inaccuracies as well. The insights of this paper are critical for the practical implementation of BS cooperation in multiuser MIMO systems, a topic that is typically oversimplified in the literature. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
multiuser MIMO, mean square error, precoding, linear, jitter, base station cooperation, interference leakage, timing-advance, spectral efficiency
in
IEEE Transactions on Wireless Communications
volume
7
issue
1
pages
155 - 165
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000252374600023
  • scopus:38349163612
ISSN
1536-1276
DOI
10.1109/TWC.2008.060193
language
English
LU publication?
yes
id
eb0db84d-f362-4267-857d-65df905657f2 (old id 1199891)
date added to LUP
2008-09-11 13:14:54
date last changed
2017-11-05 04:15:59
@article{eb0db84d-f362-4267-857d-65df905657f2,
  abstract     = {Cooperative transmission by base stations (BSs) can significantly improve the spectral efficiency of multiuser, multicell, multiple input multiple output (MIMO) systems. We show that contrary to what is often assumed in the literature, the multiuser interference in such systems is fundamentally asynchronous. Intuitively, perfect timing-advance mechanisms can at best only ensure that the desired signal components - but not also the interference components - are perfectly aligned at their intended mobile stations. We develop an accurate mathematical model for the asynchronicity, and show that it leads to a significant performance degradation of existing designs that ignore the asynchronicity of interference. Using three previously proposed linear precoding design methods for BS cooperation, we develop corresponding algorithms that are better at mitigating the impact of the asynchronicity of the interference. Furthermore, we also address timing-advance inaccuracies (jitter), which are inevitable in a practical system. We show that using jitter-statistics-aware precoders can mitigate the impact of these inaccuracies as well. The insights of this paper are critical for the practical implementation of BS cooperation in multiuser MIMO systems, a topic that is typically oversimplified in the literature.},
  author       = {Zhang, Hongyuan and Mehta, Neelesh B. and Molisch, Andreas and Zhang, Jin and Dai, Huaiyu},
  issn         = {1536-1276},
  keyword      = {multiuser MIMO,mean square error,precoding,linear,jitter,base station cooperation,interference leakage,timing-advance,spectral efficiency},
  language     = {eng},
  number       = {1},
  pages        = {155--165},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Wireless Communications},
  title        = {Asynchronous interference mitigation in cooperative base station systems},
  url          = {http://dx.doi.org/10.1109/TWC.2008.060193},
  volume       = {7},
  year         = {2008},
}