Adaptive Optimization of an Iterative Multiuser Detector for Turbo-Coded CDMA
Journal article, 2008

Extrinsic information transfer (EXIT) charts are utilized to optimize the iterative multiuser detector receiver in a multiuser turbo-coded CDMA system. The (receive) power levels are optimized for the system load using a constrained nonlinear optimization approach. The optimal decoding schedule is derived dynamically using the power optimized EXIT chart and a Viterbi search algorithm. Dynamic scheduling is shown to be a more flexible approach which results in a more stable QoS for a typical system configuration than one-shot scheduling, and large complexity savings over a receiver without scheduling. We verify through simulations that complexity savings of over 50% and power savings of over 8dB can be achieved. We show that the optimized power levels combined with adaptive scheduling allows for efficient utilization of receiver resources for heavily loaded systems.

CDMA

transmission technology

CONVERGENCE ANALYSIS

source/channel coding

wireless access

Multiuser detection

CONCATENATED CODES

transmission technology

Author

David P. Shepherd

CSIRO Data61

Australian National University

Fredrik Brännström

Chalmers, Signals and Systems, Communication and Antenna Systems, Communication Systems

Frank Schreckenbach

Technical University of Munich

Zhenning Shi

CSIRO Data61

Australian National University

Mark C. Reed

CSIRO Data61

Australian National University

IEEE Transactions on Wireless Communications

1536-1276 (ISSN)

Vol. 7 11 4284-4293

Areas of Advance

Information and Communication Technology

Subject Categories

Telecommunications

DOI

10.1109/T-WC.2008.070557

More information

Latest update

3/16/2018