Title :
Channel estimation for synchronous DS-CDMA downlink
Author :
Weiss, Anthony ; Friedlander, Benjamin
Author_Institution :
Dept. of Electr. Eng. Syst., Tel Aviv Univ., Israel
Abstract :
Synchronous code-division multiple-access (CDMA) techniques possess intrinsic protection against co-channel interference due to the orthogonal spreading codes used. However in the presence of multipath the signals lose their orthogonality property leading to increased cross-correlation. In these cases channel estimation may be needed in order to improve the detection of the desired symbols. We propose a subspace-based algorithm for blind channel estimation of a synchronous CDMA downlink. We compare the channel estimation accuracy with the Cramer Rao bound and we show that the estimation accuracy can be increased considerably using a decision feedback approach
Keywords :
blind equalisers; cochannel interference; code division multiple access; correlation theory; decision feedback equalisers; interference suppression; mobile radio; multipath channels; signal detection; spread spectrum communication; Cramer Rao bound; blind channel estimation; channel estimation; co-channel interference; code-division multiple-access; cross-correlation; decision feedback approach; downlink; mobile radio; multipath; orthogonal spreading codes; subspace-based algorithm; symbol detection; synchronous DS-CDMA downlink; Algorithm design and analysis; Channel estimation; Code division multiplexing; Cramer-Rao bounds; Downlink; Feedback; Interchannel interference; Multiaccess communication; Multicast algorithms; Protection;
Conference_Titel :
Statistical Signal and Array Processing, 1998. Proceedings., Ninth IEEE SP Workshop on
Conference_Location :
Portland, OR
Print_ISBN :
0-7803-5010-3
DOI :
10.1109/SSAP.1998.739390
