Title :
Constrained quasi-Newton algorithm for CDMA mobile communications
Author :
de Campos, M.L.R. ; Werner, S. ; Apolinario, J.A. ; Laakso, T.I.
Author_Institution :
Dept. de Eng. Electr., Inst. Mil. de Engenharia, Rio de Janeiro, Brazil
Abstract :
This work presents the derivation of the constrained version of a quasi-Newton (QN) algorithm. Application of such an algorithm to the problem of direct-sequence code-division multiple access (DS-CDMA) is investigated through simulations. The algorithm is compared to other constrained adaptation algorithms known in the literature in terms of convergence rate for a similar misadjustment level. Two scenarios describing synchronous and asynchronous transmission are used in simulations of interference suppression in DS-CDMA communication, showing the capabilities of the algorithm in such applications
Keywords :
Newton method; code division multiple access; constraint theory; convergence of numerical methods; interference suppression; mobile radio; DS-CDMA; asynchronous transmission; constrained adaptation algorithms; constrained quasi-Newton algorithm; convergence rate; direct-sequence code-division multiple access; interference suppression; misadjustment level; mobile communications; simulations; synchronous transmission; Adaptive filters; Arithmetic; Array signal processing; Constraint optimization; Convergence; Interference cancellation; Interference constraints; Least squares approximation; Mobile communication; Multiaccess communication;
Conference_Titel :
Telecommunications Symposium, 1998. ITS '98 Proceedings. SBT/IEEE International
Conference_Location :
Sao Paulo
Print_ISBN :
0-7803-5030-8
DOI :
10.1109/ITS.1998.713150
