Effect of the Asymmetry between Downlink and Uplink on TDD-MIMO Systems

Dai Kang; Song Rong-fang

doi:10.3724/SP.J.1146.2006.00431

Volume 29 Issue 8

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Dai Kang, Song Rong-fang. Effect of the Asymmetry between Downlink and Uplink on TDD-MIMO Systems[J]. Journal of Electronics & Information Technology, 2007, 29(8): 1903-1905. doi: 10.3724/SP.J.1146.2006.00431

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Dai Kang, Song Rong-fang. Effect of the Asymmetry between Downlink and Uplink on TDD-MIMO Systems[J]. Journal of Electronics & Information Technology, 2007, 29(8): 1903-1905. doi: 10.3724/SP.J.1146.2006.00431

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Effect of the Asymmetry between Downlink and Uplink on TDD-MIMO Systems

doi: 10.3724/SP.J.1146.2006.00431

Received Date: 2006-04-06
Rev Recd Date: 2006-09-18
Publish Date: 2007-08-19

Abstract

Abstract

Time-Division Duplex (TDD) and Multiple-Input Multiple-Output (MIMO) are the key techniques in the beyond third generation (B3G) mobile communication systems. In the conventional literatures on TDD, the channel state information at transmitter is obtained by assuming the reciprocity between uplink and downlink. However, affected by the unbalance of the Radio-Frequency (RF) circuitries in practice, the reciprocity between uplink and downlink can not be maintained, which will cause a decrease of the performance. In this paper, the asymmetry effect is analyzed in detail and the RF feedback strategy is proposed to eliminate it. Simulation results show that the RF feedback strategy performs much better than the conventional uplink reuse and the capacity of the MIMO systems is greatly improved.

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References(1)

References

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