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

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Author

Summary, in English

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.

Publishing year

2011

Language

English

Pages

4633-4639

Publication/Series

IEEE Transactions on Vehicular Technology

Volume

60

Issue

9

Document type

Journal article

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Status

Published

Research group

  • Electromagnetic theory
  • Radio Systems

ISBN/ISSN/Other

  • ISSN: 1939-9359