分布式天线系统的多用户分集

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。

Multiuser Diversity in Distributed Antenna System

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.