Title :
Joint incremental codeword and power adaptation in CDMA systems
Author :
Lacatus, Cataalin ; Popescu, Dimitrie C.
Author_Institution :
Department of Electrical and Computer Engineering, The University of Texas at San Antonio, 6900 N Loop 1604 W, 78249-0669, USA
Abstract :
In this paper we present a distributed algorithm for joint codeword and power adaptation in the uplink of a Code Division Multiple Access (CDMA) system. The algorithm uses incremental updates for codewords and powers of individual users such that their corresponding signal-to-interference plus-noise ratios (SINR) at the receiver are maximized subject to specified power constraints. Updates are based on a steepest descent method which is a widely used digital signal processing technique, and which can be easily implemented in a wide range of hardware for communication systems. The proposed algorithm is analyzed and illustrated with numerical examples obtained from simulations.
Keywords :
Algorithm design and analysis; Analytical models; Base stations; Covariance matrix; Digital signal processing; Distributed algorithms; Multiaccess communication; Signal processing algorithms; Signal to noise ratio; Space technology;
Conference_Titel :
Region 5 Conference, 2006 IEEE
Conference_Location :
San Antonio, TX, USA
Print_ISBN :
978-1-4244-0358-5
Electronic_ISBN :
978-1-4244-0359-2
DOI :
10.1109/TPSD.2006.5507434
