分布式天线系统的多用户分集

郑海波; 王京; 周世东; 粟欣

doi:10.3724/SP.J.1146.2006.00508

分布式天线系统的多用户分集

doi: 10.3724/SP.J.1146.2006.00508

基金项目:

国家自然科学基金(90204001)和国家863-B3G(2003AA12331002) 资助课题

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出版历程
- 收稿日期: 2006-04-17
- 修回日期: 2006-09-15
- 刊出日期: 2007-11-19

Multiuser Diversity in Distributed Antenna System

摘要

摘要: 分布式天线系统(DAS)由于其具有更大的覆盖范围，较好的功率效率，以及更高的系统容量在近年来备受关注，但很多文献都只是基于以上几个方面进行分析，而没有考虑多用户分集。该文提出了一种考虑用户公平性的最小容量损失轮询调度算法，并以该算法为基础，从多用户分集的角度研究了基于迫零波束成形算法的下行分布式天线系统的信道容量。结果表明，在天线数目和总功率相同的情况下，采用分布式天线系统可以得到比集中放置天线系统(CAS)更大的多用户分集增益。最小容量损失轮询调度算法明显优于普通轮询调度算法，该算法对DAS和CAS都适用。
- 移动通信;分布式天线系统;多用户分集;信道容量;轮询调度
Abstract: In recent years, there has been considerable interest in distributed antenna system due to its promising improvement in coverage, power efficiency and channel capacity. But many papers are only focused on these cases and do not consider multiuser diversity. A minimal capacity loss Round-Robin scheduling algorithm is presented in this paper. Coupled with this algorithm, the multiuser diversity is studied in downlink distributed antenna system based on zero-forcing beamforming. The results show that with the same antenna number and sum power Distributed Antenna System (DAS) is preferable to Co-located Antenna System (CAS) in term of multiuser diversity gain. The minimal capacity loss Round-Robin scheduling algorithm distinctly outperforms common Round-Robin scheduling algorithm and it can be used in DAS and CAS.

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参考文献(1)

Zhou S D, Zhao M, and Xu X B, et al.. Distributed wireless communication system: A new architecture for future public wireless access [J]. IEEE Communications Magazine, 2003, 41(3): 108-113.[2]Clark M V, Willis T M III, and Greenstein L J, et al.. Distributed versus centralized antenna arrays in broadband wireless networks [A]. Proc IEEE Vehicular Technology [C]. Rodes, Greece: IEEE Vehicular Technology Society, 2001, 1: 33-37.[3]Zhuang H R, Dai L, and Xiao L, et al.. Spectral efficiency of distributed antenna system with random antenna layout [J].Electronics Letters.2003, 39(6):495-496[4]Xiao L, Dai L, and Zhuang H R, et al.. Information-theoretic capacity analysis in MIMO distributed antenna systems [A]. Proc IEEE Vehicular Technology [C], Jeju, Korea: IEEE Vehicular Technology Society, 2003, 1: 22-25.[5]Tse D N. Multiuser diversity in wireless networks [A]. Wireless communication seminar [C], Stanford: Stanford University, 2000.[6]Spencer Q H, Swindlehurst A L, and Haardt M. Zero-forcing methods for downlink spatial multiplexing in multiuser MIMO channels [J].IEEE Trans. on Signal Processing.2004, 52(2):461-471[7]Dimic G and Sidropoulos N D. Low-complexity downlink beamforming for maximum sum capacity [A]. Proc IEEE Acoustics, Speech, and Signal Processing [C], Montreal, Canada: IEEE Signal Processing Society, 2004, 4: 701-704.

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