Title :
Finite precision decorrelating receivers for multiuser CDMA communication systems
Author :
Paris, Bernd-Peter
Author_Institution :
Dept. of Electr. & Comput. Eng., George Mason Univ., Fairfax, VA, USA
fDate :
4/1/1996 12:00:00 AM
Abstract :
The design of single-user decorrelating receivers employing finite-precision sequences for despreading is considered. The problem is formulated as a nonlinear bounded integer optimization problem which is shown to be network performance (NP)-hard. A branch-and-bound algorithm for finding the best finite-precision decorrelating sequence is described. Numerical examples demonstrate that the loss in performance between the optimum, infinite-precision, and the best finite-precision decorrelator is small even for large channel occupancies. Some suboptimum algorithms are investigated which greatly reduce the computational complexity associated with finding good finite precision decorrelator sequences
Keywords :
code division multiple access; computational complexity; optimisation; receivers; sequences; signal detection; spread spectrum communication; NP-hard problem; branch-and-bound algorithm; computational complexity; design; despreading; finite precision decorrelating receivers; large channel occupancies; multiuser CDMA communication systems; network performance; nonlinear bounded integer optimization problem; performance; single-user decorrelating receivers; suboptimum algorithms; CMOS technology; Computational complexity; Decorrelation; Demodulation; Detectors; Matched filters; Multiaccess communication; Nonlinear filters; Performance loss; Spread spectrum communication;
Journal_Title :
Communications, IEEE Transactions on
