Event Details
Some Issues on Multiuser Detection in DS-CDMA Systems
Presenter: Zhiwei Mao, ECE Dept.
Supervisor:
Date: Thu, May 1, 2003
Time: 15:00:00 - 16:00:00
Place: EOW 430
ABSTRACT
Abstract:
In this seminar, some issues of multiuser detection in practical systems will be presented. DS-CDMA systems with multiuser detectors used at the receiver will be investigated and two kinds of noval multiuser detectors for DS-CDMA systems will be discussed.
In the investigation of DS-CDMA systems using multiuser detectors at the receiver, a study on the performance of the system will be presented, where heterogeneous traffic with different transmission rates and quality of service (QoS) requirements is supported. The effects of some realistic factors, such as imperfect power control and the existence of multiple cells, on the system performance will be studied. In addition, algorithms will be studied to deal with the forward link power allocation problem.
The first noval multiuser detector is a fast converging adaptive minimum mean-squared-error (MMSE) detector. Particularly, it is designed for the cases where communication channels have severe near-far problem, and thus the convergence rates of adaptive MMSE detectors for users with different powers are quite different. The second noval multiuser detector is a set of semi-blind linear parallel interference cancellation (PIC) detectors for the reverse link of multiple-cell systems, where only the information about intra-cell users is available. The noval detection schemes will be introduced and the performance of the proposed detectors will also be studied.
Free and open to the public