Title :
Generalized projection algorithm for blind interference suppression in DS/CDMA communications
Author :
Park, Sang C. ; Doherty, John F.
Author_Institution :
Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
New blind adaptive interference suppression algorithms for DS/CDMA communication systems are presented. A generalized projection algorithm is presented to update a multiple access interference (MAI) suppression filter in a static communication environment. The algorithm adaptively adjusts the filter coefficients by iteratively projecting them onto constraint sets. The constraint sets consist of data sets and property sets, which are obtained from the received signal and prior knowledge of the desired signal, respectively. A space alternating generalized projection algorithm with approximate EM mapping is also presented to suppress the MAI in a dynamic communication environment. This algorithm jointly estimates the filter and desired signal amplitude using a stochastic approximation of the EM algorithm. The performance characteristics of the proposed algorithms are shown by output signal-to-interference ratio and bit-error-rate simulation results. The results show that the proposed algorithms significantly outperform the existing adaptive algorithms in steady state
Keywords :
adaptive filters; code division multiple access; interference suppression; pseudonoise codes; spread spectrum communication; DS/CDMA communication; EM mapping; bit-error-rate; blind adaptive interference suppression; constraint set; data set; dynamic communication; generalized projection algorithm; iterative projection; multiple access interference suppression filter; property set; signal-to-interference ratio; simulation; space alternating generalized projection algorithm; static communication; stochastic approximation; Adaptive filters; Amplitude estimation; Approximation algorithms; Interference constraints; Interference suppression; Iterative algorithms; Multiaccess communication; Multiple access interference; Projection algorithms; Stochastic processes;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on