Abstract
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 language | English |
---|---|
Pages (from-to) | 2867-2871 |
Number of pages | 5 |
Journal | Conference Record - International Conference on Communications |
Volume | 4 |
Publication status | Published - 2003 |
Event | 2003 International Conference on Communications (ICC 2003) - Anchorage, AK, United States Duration: 11 May 2003 → 15 May 2003 |