Title :
Delay estimation in CDMA system by differentially coherent eigenanalysis
Author :
Joutsensalo, Jyrki ; Ristaniemi, Tapani
Author_Institution :
Signal Process. Lab., Tampere Univ. of Technol., Finland
Abstract :
In this paper, we propose a very efficient and practical approach for code acquisition in the Code-Division Multiple Access (CDMA) communication system. The essential assumption is that in the initial acquisition phase a constant preamble is transmitted to the desired user. Then the differential correlation matrix obtained by delaying the signal by two or more symbols consists only of the information of the desired user, while uncorrelating interferers and noise are suppressed. Delay estimates are obtained by differentially coherent eigenanalysis of the differential correlation matrix from the MUSIC type approach. The performance of the method is competitive in practical highly loaded and fading systems
Keywords :
code division multiple access; correlation theory; delay estimation; eigenvalues and eigenfunctions; fading; interference suppression; matrix algebra; signal detection; synchronisation; CDMA system; MUSIC type approach; code acquisition; constant preamble transmission; delay estimates; delay estimation; differential correlation matrix; differentially coherent eigenanalysis; fading systems; highly loaded systems; initial acquisition phase; noise suppression; signal model; uncorrelating interferers; Autocorrelation; Delay estimation; Eigenvalues and eigenfunctions; Fading; Filters; Integrated circuit noise; Karhunen-Loeve transforms; Multiaccess communication; Multiple signal classification; Symmetric matrices;
Conference_Titel :
Electronics, Circuits and Systems, 1999. Proceedings of ICECS '99. The 6th IEEE International Conference on
Conference_Location :
Pafos
Print_ISBN :
0-7803-5682-9
DOI :
10.1109/ICECS.1999.814402
