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Impact of non-orthogonal training on performance of downlink base station cooperative transmission

Hou, Xueying; Yang, Chenyang and Lau, Buon Kiong LU (2011) In IEEE Transactions on Vehicular Technology 60(9). p.4633-4639
Abstract
Base station (BS) cooperative transmission is a promising technique to improve spectral efficiency of cellular systems, using which the channels become asymmetric in average gain. In this paper, we study the impact of the asymmetric channel gains on the performance of coherent cooperative transmission systems, when minimum mean square error (MMSE) and least square (LS) channel estimators are applied for jointly estimating the channel state information (CSI) under non-orthogonal training. We first derive an upper bound of rate loss caused by both channel estimation errors and CSI delay. We then analyze the mean square errors of the MMSE and LS estimators under both orthogonal and non-orthogonal training, which finally reveals the impact of... (More)
Base station (BS) cooperative transmission is a promising technique to improve spectral efficiency of cellular systems, using which the channels become asymmetric in average gain. In this paper, we study the impact of the asymmetric channel gains on the performance of coherent cooperative transmission systems, when minimum mean square error (MMSE) and least square (LS) channel estimators are applied for jointly estimating the channel state information (CSI) under non-orthogonal training. We first derive an upper bound of rate loss caused by both channel estimation errors and CSI delay. We then analyze the mean square errors of the MMSE and LS estimators under both orthogonal and non-orthogonal training, which finally reveals the impact of different kinds of training on the precoding performance. It is shown that non-orthogonal training for the users in different cells leads to minor performance degradation for the MMSE channel estimator assisted downlink precoding. The performance degradation induced by channel estimation errors

is almost independent of the user’s location. By contrast, the performance loss caused by CSI delay is more

severe for users located at the cell center than that for users located at the cell edge. Our analysis is verified

via simulation results. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
IEEE Transactions on Vehicular Technology
volume
60
issue
9
pages
4633 - 4639
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • wos:000297945900050
  • scopus:83655202933
ISSN
1939-9359
DOI
10.1109/TVT.2011.2168434
language
English
LU publication?
yes
id
8dc0aebc-9464-48a2-a8f5-a43fe75323d5 (old id 2154402)
alternative location
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6021390
date added to LUP
2011-09-06 12:50:31
date last changed
2017-01-01 07:37:41
@article{8dc0aebc-9464-48a2-a8f5-a43fe75323d5,
  abstract     = {Base station (BS) cooperative transmission is a promising technique to improve spectral efficiency of cellular systems, using which the channels become asymmetric in average gain. In this paper, we study the impact of the asymmetric channel gains on the performance of coherent cooperative transmission systems, when minimum mean square error (MMSE) and least square (LS) channel estimators are applied for jointly estimating the channel state information (CSI) under non-orthogonal training. We first derive an upper bound of rate loss caused by both channel estimation errors and CSI delay. We then analyze the mean square errors of the MMSE and LS estimators under both orthogonal and non-orthogonal training, which finally reveals the impact of different kinds of training on the precoding performance. It is shown that non-orthogonal training for the users in different cells leads to minor performance degradation for the MMSE channel estimator assisted downlink precoding. The performance degradation induced by channel estimation errors<br/><br>
is almost independent of the user’s location. By contrast, the performance loss caused by CSI delay is more<br/><br>
severe for users located at the cell center than that for users located at the cell edge. Our analysis is verified<br/><br>
via simulation results.},
  author       = {Hou, Xueying and Yang, Chenyang and Lau, Buon Kiong},
  issn         = {1939-9359},
  language     = {eng},
  number       = {9},
  pages        = {4633--4639},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Transactions on Vehicular Technology},
  title        = {Impact of non-orthogonal training on performance of downlink base station cooperative transmission},
  url          = {http://dx.doi.org/10.1109/TVT.2011.2168434},
  volume       = {60},
  year         = {2011},
}