Title :
Gradient Descent Interference Avoidance for Uplink CDMA Systems with Multipath
Author :
Popescu, Dimitrie C. ; Rawat, Danda B. ; Popescu, Otilia
Author_Institution :
Old Dominion Univ., Norfolk
Abstract :
In this paper we present an algorithm for joint codeword and power adaptation in uplink code division multiple access (CDMA) systems with multipath channels between users and the base station. The algorithm is based on gradient descent (GD) interference avoidance (IA) and adapts user codewords and powers incrementally to meet specified targets for the signal- to-interference+noise-ratio (SINR). The proposed algorithm is illustrated with numerical examples obtained from simulations.
Keywords :
code division multiple access; gradient methods; interference suppression; multipath channels; radio links; radiofrequency interference; code division multiple access; gradient descent interference avoidance; multipath channels; uplink CDMA systems; Base stations; Error correction codes; Interference; Multiaccess communication; Multipath channels; Power control; Power system modeling; Quality of service; Signal to noise ratio; Transmitters;
Conference_Titel :
Signals, Systems and Computers, 2007. ACSSC 2007. Conference Record of the Forty-First Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
978-1-4244-2109-1
Electronic_ISBN :
1058-6393
DOI :
10.1109/ACSSC.2007.4487384
