Constrained adaptive CMA for desired-user synchronization and detection in asynchronous DS-CDMA systems

被引：0
|
作者：
Doroslovacki, M [1 ]
Vojcic, B [1 ]
机构：
[1] George Washington Univ, Dept Elect Engn & Comp Sci, Washington, DC 20052 USA
来源：
2001 MILCOM, VOLS 1 AND 2, PROCEEDINGS: COMMUNICATIONS FOR NETWORK-CENTRIC OPERATIONS: CREATING THE INFORMATION FORCE | 2001年
关键词：
D O I：
暂无
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
A technique for estimation of desired-user bits in asynchronous DS-CDMA systems is developed without an explicit bit synchronization between the receiver and the transmitter. A bit value is estimated based on the observation window of size 2N - 1, where N is the length of bit period. The window shifts for N in order to estimate a new bit. A constrained adaptive constant modulus algorithm (CMA) is used to estimate bits. The constraint limits the maximum elevation angle a weight vector that multiplies the observations can have with respect to the hyperplane defined by shifted copies of the desired-user spreading sequence. The constraint is parameterized so that monitoring is not needed. The constrained CMA is compared with the unconstrained CMA. In addition to the bit estimation, the constrained CMA can estimate the desired-user signal delay.
引用
收藏
页码：1082 / 1086
页数：5
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