Title :
An efficient technique for deriving receiver filters in multiuser asynchronous DS/SSMA
Author :
Alexander, Paul D. ; Rasmussen, Lars E.
Author_Institution :
Signal Process. Res. Inst., Univ. of South Australia, The Levels, SA, Australia
Abstract :
It has been shown that the performance of sub-optimal multiuser receivers for synchronous DS/SSMA is improved by using a noise whitening matched filter (WMF) as a receiver filter. In the asynchronous case the performance is also improved through the use of a WMF. We present an efficient technique for deriving the WMF for an asynchronous DS/SSMA system. The WMF is determined as the Cholesky decomposition of X where X is the solution to X=R0-R1TX-1 R1. A recursive algorithm for determining X is proposed. Constraints on the spreading codes that ensure convergence of the algorithm are derived and the efficiency of the technique is demonstrated by simulation
Keywords :
convergence of numerical methods; filtering theory; matched filters; multi-access systems; pseudonoise codes; radio receivers; recursive estimation; spread spectrum communication; telecommunication channels; Cholesky decomposition; convergence; multiuser asynchronous DS/SSMA; performance; receiver filters; recursive algorithm; spreading codes; AWGN; Additive white noise; Australia; Electronic mail; Gaussian noise; Matched filters; Maximum likelihood estimation; Mobile communication; Signal processing; Signal processing algorithms;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1994. Wireless Networks - Catching the Mobile Future., 5th IEEE International Symposium on
Conference_Location :
The Hague
Print_ISBN :
90-5199-193-2
DOI :
10.1109/WNCMF.1994.529144
