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Space- time spreading MIMO-CDMA downlink systems using constrained tensor modeling

机译:使用约束张量建模的时空扩展MIMO-CDMA下行链路系统

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摘要

This paper considers the downlink of a multiple-input multiple-output (M1M0) code-division multiple-access (CDMA) system based on space-time spreading (STS) using multiuser/multicode transmission. A constrained tensor model is proposed for the STS transmitted signal. The new STS model generalizes existing ones by allowing multiuser spatial multiplexing with different code reuse/multiplexing patterns for each user. This model is parametrized by two allocation matrices with variable structure, which allow to control, respectively, the allocation of multiple data streams and spreading codes to the transmit antennas. A methodology is proposed to design these allocation matrices leading to finite sets of feasible STS schemes with guaranteed blind symbol recovery. The construction of feasible STS schemes for 2, 3 and 4 transmit antennas is presented as an illustration of this methodology. A blind receiver based on the alternating least squares algorithm is used for symbol recovery. The bit-error-rate performance of this receiver is tested and compared to some existing STS-based downlink transceivers.
机译:本文考虑了基于使用多用户/多码传输的时空扩展(STS)的多输入多输出(M1M0)码分多址(CDMA)系统的下行链路。针对STS传输信号,提出了一个约束张量模型。新的STS模型通过允许对每个用户使用不同代码重用/复用模式的多用户空间复用来概括现有的模型。该模型由两个具有可变结构的分配矩阵参数化,这两个分配矩阵允许分别控制多个数据流和扩频码到发射天线的分配。提出了一种方法来设计这些分配矩阵,从而产生有限的可行STS方案集,并保证盲符号的恢复。提出了针对2、3和4个发射天线的可行STS方案的构造,作为该方法的说明。基于交替最小二乘算法的盲接收机用于符号恢复。测试了该接收器的误码率性能,并将其与某些现有的基于STS的下行链路收发器进行了比较。

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