Asymptotic Analysis of General Multiuser Detectors in MIMO DS-CDMA Channels
Asymptotic Analysis of General Multiuser Detectors in MIMO DS-CDMA Channels
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DOI：
10.1109/jsac.2008.080407
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发表时间：
2007-06
影响因子：
16.4
通讯作者：
K. Takeuchi;Toshiyuki TANAKA;T. Yano
中科院分区：
文献类型：
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作者：
K. Takeuchi;Toshiyuki TANAKA;T. Yano
我们分析了MIMO DS-CDMA信道的去耦结构与一般的多用户检测器前端，使用副本的方法，以比较空时扩频（STS）和时间扩频（TS）计划。在多用户限制下，STS方案的MIMO DS-CDMA信道被解耦成一组单用户SIMO信道。另一方面，一个MIMO DS-CDMA信道与TS方案被解耦成一个银行的单用户MIMO信道。考虑到性能，如果存在传输空间相关性，则STS方案在快衰落情况下优于TS方案。在复杂度方面，STS方案不需要任何空时编码。另一方面，TS方案确实需要空时编码以便实现与STS方案相当的性能。STS方案提高了通信性能，降低了发射机和接收机结构的复杂性。
We analyze decoupling structures of MIMO DS-CDMA channels with general multiuser detector front ends, using the replica method, in order to compare the space-time spreading (STS) and time spreading (TS) schemes. In the many- user limit, a MIMO DS-CDMA channel with the STS scheme is decoupled into a bank of single-user SIMO channels. On the other hand, a MIMO DS-CDMA channel with the TS scheme is decoupled into a bank of single-user MIMO channels. In view of performance, the STS scheme outperforms the TS scheme in the fast fading situation if transmit spatial correlations exist. In terms of complexity, the STS scheme does not require any space-time coding. On the other hand, the TS scheme does require space-time coding in order to achieve comparable performance to the STS scheme. The STS scheme improves the performance of communications and reduces the complexity of transmitter and receiver architectures.