Performance enhancement through joint detection of cochannel signals using diversity arrays
Performance enhancement through joint detection of cochannel signals using diversity arrays
复制标题
通过使用分集阵列联合检测同信道信号来增强性能
DOI：
10.1109/vetec.1998.686398
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Cavers
中科院分区：
文献类型：
--
作者：
S. Grant;J. Cavers
基于利用多个用户使用的信道之间的差异的联合检测允许接收机在不依赖频谱扩展的情况下区分同信道信号。本文对这一课题做出了一些新的贡献：给出了衰落环境中任意数目的用户和分集天线在理想和非理想CSI下的平均符号错误率联合界的解析表达式，并与经典的MMSE合并进行了性能比较。这一表现令人惊叹。有了精确的CSI，多个用户只需一根天线就可以体验到良好的性能；此外，对于完美的CSI，每增加一个用户只会产生2分贝的损失。对于几个天线，可能会支持比天线数量多得多的用户，但每增加一个用户，性能就会缓慢下降。此外，对信道估计过程不要求高精度。在所有情况下，联合检测的性能都比最小均方误差合并高出一个数量级。
Joint detection based on exploiting differences among the channels employed by several users allows a receiver to distinguish cochannel signals without reliance on spectrum spreading. This paper makes a number of new contributions to the topic: it provides an analytical expression for the union bound on average symbol error rate for an arbitrary number of users and diversity antennas in a fading environment, for both perfect and imperfect CSI, and it compares the performance of joint detection with diversity antennas against classical MMSE combining. The performance is remarkable. With accurate CSI, several users can experience good performance with only a single antenna; moreover, for perfect CSI, only a 2 dB penalty is incurred for each additional user. With several antennas, many more users than the number of antennas may be supported with a slow degradation in performance for each additional user. Furthermore, high accuracy is not required from the channel estimation process. In all cases, the performance of joint detection exceeds that of MMSE combining by orders of magnitude.