Title :
Transmitter adaptation of DS-CDMA signals in multipath channels
Author_Institution :
Dept. of Electr. Eng., Texas Univ., San Antonio, TX, USA
Abstract :
The main results of this paper are the conditions on channel matrices and real optimal transmitter adaptation sequences such that the received multipath sequences are real generalized WBE (Welch bound equality) sequences. Total weighted squared correlation (TWSC) in the presence and the absence of the colored noise in multipath channels for multiple cell synchronous DS-CDMA systems is defined. As an optimality criterion we used the minimum of the TWSC for a given signature sequence set in slow flat multipath channels and in the presence of colored noise. Numerical results for overloaded DS-CDMA systems are presented in order to support our analysis.
Keywords :
code division multiple access; correlation methods; multipath channels; radio transmitters; radiofrequency interference; spread spectrum communication; DS-CDMA signal; Welch bound equality sequence; channel matrix; colored noise; direct sequence code division multiple access; flat multipath channel; multiple access interference; multiple cell synchronous DS-CDMA system; optimal transmitter adaptation sequence; total weighted squared correlation; Bandwidth; Base stations; Colored noise; Correlation; Multiaccess communication; Multimedia systems; Multipath channels; Multiple access interference; State estimation; Transmitters;
Conference_Titel :
Signals, Systems and Computers, 2004. Conference Record of the Thirty-Seventh Asilomar Conference on
Print_ISBN :
0-7803-8104-1
DOI :
10.1109/ACSSC.2003.1291947
