Density evolution and power profile optimization for iterative multiuser decoders based on individually optimum multiuser detectors

Ralf R. Muller, Giuseppe Giuseppe Caire, Toshiyuki Tanaka

    Research output: Contribution to conferencePaper

    Abstract

    Iterative multiuser joint decoding based on exact Belief Propagation (BP) is analyzed in the large system limit by means of the replica method. It is shown that performance can be improved by appropriate power assignment to the users. The optimum power assignment can be found by linear programming in most technically relevant cases. The performance of BP iterative multiuser joint decoding is compared to suboptimum approximations based on Interference Cancellation (IC). While IC receivers show a significant loss for equal-power users, they yield performance close to BP under optimum power assignment.
    Original languageEnglish
    Pages1-10
    Number of pages10
    Publication statusPublished - 4 Oct 2002
    Event40th Annual Allerton Conference on Communications, Control and Computing - Urbana, United States
    Duration: 2 Oct 20024 Oct 2002

    Conference

    Conference40th Annual Allerton Conference on Communications, Control and Computing
    CountryUnited States
    CityUrbana
    Period2/10/024/10/02

    Keywords

    • Belief Propagation
    • Iterative multiuser joint decoding
    • replica method
    • optimum power assignment
    • Interference Cancellation

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