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

被引：0
|
作者：
Zhang, J [1 ]
Kennedy, RA [1 ]
Abhayapala, TD [1 ]
机构：
[1] Australian Natl Univ, RSISE, Dept Telecommun Engn, Canberra, ACT 0200, Australia
来源：
2003 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, VOLS 1-5: NEW FRONTIERS IN TELECOMMUNICATIONS | 2003年
关键词：
D O I：
暂无
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
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 T-d, 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.
引用
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页码：2867 / 2871
页数：5
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