Title :
Sequence optimization in CDMA point-to-point transmission with multipath
Author :
Gao, Li ; Wong, Tan F.
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA
Abstract :
We consider the problem of spreading sequence optimization in a CDMA point-to-point transmission over a multipath fading channel. The aim of the sequence optimization is to construct a set of spreading sequences to support users in the system with the minimum total transmission power when the MMSE receiver is used for signal reception. We consider the sequence optimization for two difference cases: when the number of users is smaller than or equal to the spreading gain, and when the number of users is larger than the spreading gain. Eigenvectors of the multipath channel matrix describe the channel space spanned by the CDMA system. The optimal solution distributes users´ spreading sequences into the channel space in an optimal manner.
Keywords :
code division multiple access; eigenvalues and eigenfunctions; fading channels; least mean squares methods; matrix algebra; multipath channels; multiuser channels; optimisation; radio receivers; spread spectrum communication; CDMA point-to-point transmission; MMSE receiver; channel space; eigenvectors; minimum total transmission power; multipath channel matrix; multipath fading channel; optimal solution; signal reception; spreading gain; spreading sequence optimization; synchronous DS-CDMA system; AWGN channels; Adaptive algorithm; Code division multiplexing; Distributed algorithms; Fading; Matched filters; Multiaccess communication; Multipath channels; Power system modeling; Signal resolution;
Conference_Titel :
Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th
Print_ISBN :
0-7803-7467-3
DOI :
10.1109/VETECF.2002.1040631
