MMSE receivers for multirate DS-CDMA systems

被引:28
作者
Sabharwal, A [1 ]
Mitra, U
Moses, R
机构
[1] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA
[2] Univ So Calif, Dept Elect Engn, Los Angeles, CA 90089 USA
[3] Ohio State Univ, Dept Elect Engn, Columbus, OH 43210 USA
基金
美国国家科学基金会;
关键词
asynchronous DS-CDMA; cyclostationarity; multicarrier systems; multipath channels; multimedia systems; multiple data rate; MMSE receivers;
D O I
10.1109/26.974265
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
Minimum-mean squared error (MMSE) receivers are designed and analyzed for multiple data rate direct-sequence code-division multiple-access (DS-CDMA) systems. The inherent cyclostationarity of the DS-CDMA signal is exploited to construct receivers for asynchronous multipath channels. Multiple- and single-bandwidth access are treated for both single and multi-carrier scenarios. In general, the optimal receiver is periodically time-varying. When the period of the optimal receiver is large, suboptimal receivers are proposed to achieve a lower complexity implementation; the receivers are designed as a function of the cyclic statistics of the signals. In multiple chipping rate systems, complexity of receivers for smaller bandwidth users can also be controlled by changing their front-end filter bandwidth. The effect of front-end filter bandwidth on receiver performance and system capacity is quantified for a variable chipping rate system. Analysis and simulation show that significant performance gains are realized by the periodically time-varying MMSE receivers over their time-invariant counterparts.
引用
收藏
页码:2184 / 2197
页数:14
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