Title :
Multipath channel estimation for the uplink of a DS-CDMA system
Author :
Amico, A. A D ; Mengali, U. ; Morelli, M.
Author_Institution :
Dept. of Inf. Eng., Pisa Univ., Italy
Abstract :
This paper investigates channel estimation in the uplink of a DS-CDMA system. The transmission medium is characterized by the presence of multipath components and the parameters of interest are the delays and complex gains of the propagation paths. We propose a new method for estimating the channel parameters of a user entering the system. The method is based on the maximum likelihood criterion and exploits a training sequence. In comparison with other estimation algorithms it has two advantages. First, it reduces a complicated multidimensional optimization problem to a sequence of one-dimensional problems. Secondly, it has better capability to resolve closely-spaced multipath components. Computer simulations are used to assess its performance. It is found that it is resistant to multiuser interference and can be effectively used in third generation mobile cellular networks
Keywords :
cellular radio; code division multiple access; delay estimation; maximum likelihood estimation; multipath channels; multiuser channels; radio links; radio networks; radiofrequency interference; spread spectrum communication; DS-CDMA; DS-CDMA system; UMTS system; closely-spaced multipath components resolution; computer simulations; delay estimation; direct-sequence code-division multiple-access; estimation algorithms; maximum likelihood criterion; maximum likelihood estimator; multidimensional optimization; multipath channel estimation; multipath components; multiuser interference; one-dimensional problems; propagation paths; third generation mobile cellular networks; training sequence; transmission medium; uplink; Channel estimation; Computer simulation; Interference; Land mobile radio cellular systems; Maximum likelihood estimation; Multiaccess communication; Multidimensional systems; Multipath channels; Parameter estimation; Propagation delay;
Conference_Titel :
Communications, 2002. ICC 2002. IEEE International Conference on
Conference_Location :
New York, NY
Print_ISBN :
0-7803-7400-2
DOI :
10.1109/ICC.2002.996808
