Optimal joint signal design and power control for CDMA with decision-feedback receivers subject to user QoS constraints

Author

Guess, Tommy

Author_Institution

Dept. of Electr. & Comput. Eng., Virginia Univ., Charlottesville, VA, USA

fYear

2001

fDate

2001

Firstpage

129

Abstract

A synchronous code-division multiple-access (CDMA) channel is considered for which power control is available. Each of the users is assigned a quality-of-service (QoS) threshold that is measured in terms of a signal-to-interference ratio (SIR), and to cover the situation of multiple classes of users, these are allowed to be unequal to each other. The receiver is taken to be of the nonlinear decision-feedback type in which the users are successively detected. Given the processing gain of the system, which is no greater than the number of users, we minimize the required total power (i.e., the sum of the users´ received powers) over all sets of signature sequences and power-control policies that allow the users to meet their required QoS constraints

Keywords

code division multiple access; feedback; multiuser channels; power control; quality of service; radio receivers; radiofrequency interference; sequences; signal synthesis; telecommunication control; SIR; code-division multiple-access; decision-feedback receivers; nonlinear decision-feedback receiver; optimal joint signal design; power control; processing gain; quality-of-service threshold; signal-to-interference ratio; signature sequences; synchronous CDMA channel; total power minimisation; user QoS constraints; Covariance matrix; Feedback; Multiaccess communication; Power control; Power system modeling; Quality of service; Signal design; Sociotechnical systems; Statistics; Symmetric matrices;

fLanguage

English

Publisher

ieee

Conference_Titel

Information Theory, 2001. Proceedings. 2001 IEEE International Symposium on

Conference_Location

Washington, DC

Print_ISBN

0-7803-7123-2

Type

conf

DOI

10.1109/ISIT.2001.935992

Filename

935992