Title :
Joint symbol detection and channel parameter estimation in asynchronous DS-CDMA systems
Author :
Ranheim, Anders ; Pelin, Per
Author_Institution :
Dept. of Signal & Syst., Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
2/1/2000 12:00:00 AM
Abstract :
A method for jointly estimating the time delay and complex gain parameters, as well as detecting the transmitted symbols in an asynchronous multipath DS-CDMA system, is presented. A short training sequence is used to obtain a coarse estimate of the channel parameters, which is consequently used to detect the symbols. By exploiting structure in the digitally modulated signals, the method iterates to (i) improve the estimate of the channel parameters and (ii) reduce the probability of incorrect detection. The method´s efficacy is demonstrated by numerical simulations
Keywords :
code division multiple access; delay estimation; error statistics; iterative methods; multipath channels; parameter estimation; signal detection; asynchronous DS-CDMA systems; channel parameter estimation; complex gain parameters; digitally modulated signals; incorrect detection probability; multipath channel; numerical simulation; short training sequence; symbol detection; time delay estimation; Covariance matrix; Delay effects; Maximum likelihood detection; Maximum likelihood estimation; Multiaccess communication; Parameter estimation; Robustness; Signal processing; Speech processing; Taylor series;
Journal_Title :
Signal Processing, IEEE Transactions on
