Multiuser detection for packet-switched CDMA networks with retransmission diversity
Multiuser detection for packet-switched CDMA networks with retransmission diversity
复制标题
DOI：
10.1109/tsp.2003.821098
复制
发表时间：
2004-03
影响因子：
5.4
通讯作者：
Yi Sun;Xiaodong Cai
中科院分区：
文献类型：
--
作者：
Yi Sun;Xiaodong Cai
在本文中，多用户检测是利用重传多样性来开发的。开发了一种最大似然检测器 (MLD)，其复杂度与仅使用一次传输中的数据的 MLD 相同。结果表明，重传分集增加了最小信号距离，因此显着提高了 MLD 的性能。线性 MMSE、去相关和 MF 检测器是根据两种设计方法开发的。在第一种方法中，我们考虑了多个线性检测器的输出的加权和，其中每个线性检测器针对一次传输实现。获得最大化信号干扰噪声比 (SINR) 的最佳权重集。在第二种方法中，线性检测器联合利用从所有传输收集的统计数据。当线性检测器的 SINR 在每次传输中相同时，对于 J 个传输的数据包，重传分集显示将 SINR 增加了 10log/sub 10/J dB。这三个线性检测器在具有随机扩展序列的大型网络中的极限误码率以封闭形式获得，这使得能够进一步评估网络吞吐量。
In this paper, multiuser detection is developed with exploitation of retransmission diversity. A maximum likelihood detector (MLD) that has the same order of complexity as the MLD using only the data in one transmission is developed. It is shown that the retransmission diversity increases the minimum signal distance and, therefore, significantly improves the performance of MLD. The linear MMSE, decorrelating, and MF detectors are developed under two design approaches. In the first approach,we have considered the weighted sum of outputs of a number of linear detectors, where each is implemented for one transmission. The optimum set of weights that maximizes the signal-to-interference-and-noise ratio (SINR) is obtained. In the second approach, a linear detector jointly utilizes the statistics collected from all transmissions. When the SINR of a linear detector is the same in each transmission, the retransmission diversity is shown to increase the SINR by 10log/sub 10/J dB for a packet of J transmissions. The limiting bit error rate for these three linear detectors in large networks with random spreading sequences is obtained in closed form, which enables further network throughput evaluation.