A Transmit Precoding Scheme for Downlink Multiuser MIMO Systems

被引：0
|
作者：
Wang, Hualei [1 ]
Li, Lihua [1 ]
Wang, Ji [1 ]
Song, Lei [1 ]
Ma, Yue [1 ]
Zhou, Zhou [1 ]
机构：
[1] Beijing Univ Posts & Telecommun, Key Lab Universal Wireless Commun, Minist Educ, Beijing 100876, Peoples R China
来源：
2011 IEEE VEHICULAR TECHNOLOGY CONFERENCE (VTC FALL) | 2011年
关键词：
Multiuser MIMO downlink precoding; block diagonalization(BD); MUI; noise;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
This paper focuses on transmit precoding for multiuser MIMO downlink systems. In multiuser MIMO systems, multiuser interference (MUI) and noise are two well-known factors with respect to the system's performance. Block diagonalization (BD) method is proposed to completely eliminate MUI by placing the intended users in the nullspace of all the unintended users. But the BD method imposes a condition on the relation between the number of transmit and receive antennas. In addition, BD method causes the noise enhancement due to not considering noise's influence. Thus, at low and medium signal-to-noise ratio (SNR) regime, the performance of the BD scheme is poor. In this paper, we propose a novel precoding approach for users with multiple antennas to overcome the above mentioned drawbacks of the BD method for multiuser MIMO precoding systems. Simulation results confirm that the proposed algorithm achieves performance improvement over the conventional BD scheme with low complexity. The effect of channel estimate errors on system performance is also studied.
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页数：5
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