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An Improved Signal-to-Leakage-and-Noise Ratio Multi-User Precoding Algorithm |
Zhang Ning-bo; Kang Gui-xia; Zhang Ping; Liu Ze-min |
Wireless Technology Innovation Institute, Beijing University of Posts and Telecommunications, Beijing 100876, China; Key Laboratory of Universal Wireless Communications (BUPT), Ministry of Education, Beijing 100876, China |
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Abstract In Time-Division Duplex (TDD) system, it is possible to obtain downlink channel metrics at the transmitter due to the channel reciprocity. However, there has a disposal delay between uplink channel and downlink channel in TDD systems, the delay will decrease MU-MIMO precoding performance in time-varying channels. System performance can be improved greatly by channel predictor technique, but the channel prediction error will bring the performance loss. An improved MU-MIMO precoding algorithm based on prediction error is proposed in this paper. Precoding vectors are amended by prediction Mean Square Error (MSE) in this method. Simulation results show that the proposed scheme gets more gains over traditional channel prediction scheme, especially in higher vehicle speed scenario.
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Received: 06 October 2008
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