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首页> 外文期刊>IEEE transactions on wireless communications >System-wide capacity increase for narrowband cellular systems through multiuser detection and base station diversity arrays
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System-wide capacity increase for narrowband cellular systems through multiuser detection and base station diversity arrays

机译：通过多用户检测和基站分集阵列提高窄带蜂窝系统的系统范围容量

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Multiuser detection (MUD) of signals occupying the same time/frequency slot has been shown to provide significant increases in the capacity of a single cell or coverage area. In a cellular system, however, increasing the number of users per cell also produces increased interference from other cells. Compensation by increasing the co-channel cell spacing partially offsets the capacity gain due to MUD, and the net effect on system capacity then rests on the detection method, such as maximum likelihood (ML) or minimum mean-squared error (MMSE). This paper is the first to analyze the net capacity gains due to ML-MUD in time division multiple access (TDMA), and the first to compare ML-MUD with MMSE-MUD on this basis. We demonstrate that ML-MUD with M cochannel users per cell and four base station antennas gives a net system capacity that is M times greater than that of single-user TDMA system with two antennas. In contrast, we show that MMSE-MUD gives only a modest net capacity increase, and that the system capacity may actually decrease with more than one or two users per cell, making it poorer than the original single-user system.
机译：已经证明，占用相同时间/频率时隙的信号的多用户检测（MUD）可以显着增加单个小区或覆盖区域的容量。然而，在蜂窝系统中，增加每个小区的用户数量也会增加来自其他小区的干扰。通过增加同信道信元间隔的补偿会部分抵消由于MUD引起的容量增益，然后对系统容量的净影响取决于检测方法，例如最大似然（ML）或最小均方误差（MMSE）。本文是第一个分析时分多址（TDMA）中由于ML-MUD带来的净容量增长的方法，也是第一个在此基础上比较ML-MUD和MMSE-MUD的方法。我们证明，每个小区M个同信道用户和四个基站天线的ML-MUD的净系统容量比具有两个天线的单用户TDMA系统的净系统容量大M倍。相反，我们表明MMSE-MUD仅使网络容量有适度的增加，并且每个小区有一个或两个以上的用户时，系统容量实际上可能会减少，从而使其性能比原始的单用户系统差。

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