Title :
Spatial-temporal propagation parameter estimation in the asynchronous DS-CDMA systems over fading channel
Author :
Wu, Rui ; Ristaniemi, Tapani
Author_Institution :
Dept. of Math. Inf. Technol., Jyvaskyla Univ., Finland
Abstract :
This paper is concerned with code timing and direction-of-arrival (DOA) estimation, called two-dimensional code acquisition, in asynchronous direct sequence spread spectrum communication systems with the presence of Rayleigh fading effects. An antenna array is used in this paper. A method named independent component analysis frequency selection (ICA-FS) is used to perform interference suppression before parameter estimation. The operation for suppressing interference brings a decrease in undesired Gaussian effects. The ICA-FS requires a training sequence corresponding to the desired user to be known, and data signals corresponding to different users to be statistically independent.
Keywords :
Gaussian channels; Rayleigh channels; antenna arrays; channel estimation; code division multiple access; direction-of-arrival estimation; frequency estimation; independent component analysis; interference suppression; spread spectrum communication; DOA estimation; ICA-FS; Rayleigh fading; antenna array; asynchronous DS-CDMA systems; code timing; direct sequence spread spectrum communication systems; direction-of-arrival estimation; fading channel; independent component analysis frequency selection; interference suppression; parameter estimation; spatial-temporal propagation; statistically independent data signals; training sequence; two-dimensional code acquisition; undesired Gaussian effects; Antenna arrays; Antennas and propagation; Direction of arrival estimation; Fading; Interference suppression; Multiaccess communication; Parameter estimation; Rayleigh channels; Spread spectrum communication; Timing;
Conference_Titel :
Communications and Information Technology, 2004. ISCIT 2004. IEEE International Symposium on
Print_ISBN :
0-7803-8593-4
DOI :
10.1109/ISCIT.2004.1412472
