Semi-blind multiuser detection in zero-padded OFDM-CDMA systems

被引:0
作者
Boloix-Tortosa, Rafael [1 ]
Payan-Somet, F. Javier [1 ]
Murillo-Fuentes, Juan Josd [1 ]
机构
[1] Univ Seville, Dept Teor Senal & Commun, Camino Descubrimientos Sn, Seville 41092, Spain
来源
MULTI-CARRIER SPREAD-SPECTRUM | 2006年
关键词
D O I
10.1007/1-4020-4437-2_20
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, we propose a new semi-blind multiuser detector for zero-padded OFDM-CDMA systems. We show that the downlink transmission in a wireless zero-padded OFDM-CDMA system can be modeled as a linear mixture of the transmitted data symbols. Therefore, blind source separation (BSS) algorithms based on the natural gradient are good candidates to blindly recover those symbols. Before applying BSS, we propose to reduce the effect of the additive noise performing a sub-space projection. On the other hand, we propose to take advantage of any available, may be rough, channel estimation to initialize the blind algorithm. The benefits of initializing the BSS approach are twofold: we avoid the source scaling and arrangement problem and we achieve a quite faster convergence.
引用
收藏
页码:191 / +
页数:3
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