Title :
Optimization of Unequal Power Coded Multiuser DS-CDMA using Extrinsic Information Transfer Charts
Author :
Shepherd, David P. ; Shi, Zhenning ; Reed, Mark C. ; Schreckenbach, Frank
Author_Institution :
Nat. ICT Australia, Australian Nat. Univ., Canberra, ACT
Abstract :
We utilize extrinsic information transfer (EXIT) charts to optimize the power allocation in a multiuser turbo-coded CDMA system. We investigate two methods to obtain the optimal power levels: the first minimises the total power; the second minimises the area between the transfer curves of the interference canceller (IC) or turbo decoder. We show through simulation that the optimized power levels allow for successful decoding of heavily loaded systems.
Keywords :
code division multiple access; interference suppression; multiuser channels; spread spectrum communication; turbo codes; EXIT chart; direct sequence code division multiple access system; extrinsic information transfer; interference canceller; power allocation; turbo decoder; unequal power coded multiuser DS-CDMA optimization; Analysis of variance; Forward error correction; Interference cancellation; Interference constraints; Iterative decoding; Linear programming; Multiaccess communication; Power distribution; Transfer functions; Turbo codes;
Conference_Titel :
Information Sciences and Systems, 2006 40th Annual Conference on
Conference_Location :
Princeton, NJ
Print_ISBN :
1-4244-0349-9
Electronic_ISBN :
1-4244-0350-2
DOI :
10.1109/CISS.2006.286690
