Switched Interleaving Techniques with Limited Feedback for Interference Mitigation in DS-CDMA Systems

被引:14
作者
Cai, Yunlong [1 ]
de lamare, Rodrigo C. [2 ]
Fa, Rui [3 ]
机构
[1] Zhejiang Univ, Dept Informat Sci & Elect Engn, Hangzhou 310027, Zhejiang, Peoples R China
[2] Univ York, Dept Elect, Commun Res Grp, York YO10 5DD, N Yorkshire, England
[3] Univ Liverpool, Dept Elect Engn & Elect, Liverpool L69 3GJ, Merseyside, England
关键词
Direct sequence code division multiple access (DS-CDMA); interference suppression; multiuser detection; limited feedback; chip-interleaving; ADAPTIVE TRANSMISSION; CHANNEL-PREDICTION; MULTIPLE; OPTIMIZATION; CANCELLATION; INFORMATION; DETECTORS;
D O I
10.1109/TCOMM.2011.051711.090120A
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 novel switched-interleaving algorithm based on limited feedback for both uplink and downlink DS-CDMA systems. The proposed switched chip-interleaving DS-CDMA scheme requires the cooperation between the transmitter and the receiver, and a feedback channel sending the index of the interleaver to be used. The transmit chip-interleaver is chosen by the receiver from a codebook of interleaving matrices known to both the receiver and the transmitter and the codebook index is sent back using a limited number of bits. In order to design the codebook, we consider a number of different chip patterns by using random interleavers, block interleavers and a proposed frequently selected patterns method (FSP). The best interleaving patterns are chosen by the selection functions of the received signal to interference plus noise ratio (SINR) for both downlink and uplink systems. Since the selection function needs to determine the best interleaver based on the channel state information, it is necessary to predict reliably the channel state information for typical delay values. We present symbol-based and block-based linear minimum mean squared error (MMSE) receivers for interference suppression. Simulation results show that our proposed algorithm achieves significantly better performance than the conventional DS-CDMA (C-CDMA) systems and the existing chip-interleaving, linear precoding and adaptive spreading techniques.
引用
收藏
页码:1946 / 1956
页数:11
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