Title :
Block-Shanno multi-user constant modulus algorithm for use in multi-user CDMA environment
Author :
Arasaratnam, P. ; Zhu, S. ; Constantinides, A.G.
Author_Institution :
Dept. of Electr. & Electron. Eng., Imperial Coll. of Sci., Technol. & Med., London, UK
fDate :
4/25/2002 12:00:00 AM
Abstract :
In a multi-user direct sequence code division multiple access (DS-CDMA) system, retrieval of transmitted signals with a conventional receiver is difficult when there is chip asynchronism, multipath propagation and the associated near-far problem. Results presented show that despite these problems an adaptive linear receiver based on a mixed cross correlation and constant modulus algorithm (CC-CMA) has the potential to retrieve all users simultaneously. Compared with the conventional CC-CMA algorithm, the proposed algorithm achieves faster convergence. Simulations support the improved convergence properties of the algorithm
Keywords :
Newton method; adaptive equalisers; blind equalisers; code division multiple access; convergence of numerical methods; multiuser channels; spread spectrum communication; Block-Shanno multiuser constant modulus algorithm; DS-CDMA; adaptive linear receiver; binary phase-shift keying; blind equalisation; block processing; chip asynchronism; faster convergence; impulse response; mixed cross correlation; modified Newton algorithm; multipath propagation; multiuser CDMA environment; near-far problem; transmitted signals retrieval;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20020165
