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| Adaptive Modulation for MIMO Systems with Channel State Information Feedback Periods and Delays |
| Song Yang; Chang Yong-yu; Yang Da-cheng |
| School of Telecomm. Eng., Beijing Univ. of Posts and Telecomm., Beijing 100876, China |
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Abstract This paper investigates the impact of feedback period and delay on the performance of Multiple-Input Multiple-Output (MIMO) systems with adaptive modulation, and analyzes the characteristics of the equivalent parallel fading subchannels obtained by Singular Value Decomposition (SVD). Its receiver detection method and a simplified detection order are given as well. The results show that the correlation of the subchannels’ fading remains large within a certain period of time. System's performance can be improved significantly when the Zero Forcing (ZF) and Interference Cancellation (IC) techniques are adopted at the receiver.
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Received: 22 July 2005
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2007, Vol. 29 
