New results on the capacity of M-ary PPM ultra- wideband systems

J. Zhang*, R. A. Kennedy, T. D. Abhayapala

*Corresponding author for this work

    Research output: Contribution to journalConference articlepeer-review

    16 Citations (Scopus)


    In this paper, some new results on the capacity of a typical M-ary pulse position modulation (M-PPM) time hopping (TH) Ultra- Wideband (UWB) system are presented. Previous results using a "pure PPM model" are proven to exaggerate the real capacity of a UWB system. Based on an extended model containing correlator and soft decision decoding, the capacity is evaluated in the single-user case and in the case of a system with asynchronous multiple user interference (MUI) when the inputs are equiprobable. It is found that only when bit- signal-to-noise ratio (bit-SNR) is high enough, larger M leads to higher capacity; and for a specific M, the optimal values of PPM time offset parameter Td, which maximize the capacity, are independent of bit-SNR. The influence of MUI on capacity is detrimental, especially in the case of high bit-SNR.

    Original languageEnglish
    Pages (from-to)2867-2871
    Number of pages5
    JournalConference Record - International Conference on Communications
    Publication statusPublished - 2003
    Event2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States
    Duration: 11 May 200315 May 2003


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