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Capacity of M-ary PPM ultra-wideband communications over AWGN channels

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2 Author(s)
Li Zhao ; Dept. of Electron. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA ; A. M. Haimovich

We compute the channel capacity of M-ary pulse position modulation (PPM) ultra-wideband (UWB) communications over the additive white Gaussian noise channel. The computation extends the known capacity of PPM orthogonal signals to incorporate UWB-specific constraints. The constraints are the power spectrum density limitation under FCC Part 15 rules and a specified spreading ratio. The UWB capacity is expressed as a function of range demonstrating a fundamental trade-off in UWB system design. UWB capacity is also compared to the capacity of M-ary phase shift keying (PSK) direct sequence spread spectrum (DS-SS). It is shown that for the same power constraint,. both systems have similar capacity at high signal to noise ratio (SNR). At low SNR, UWB has a significant advantage for multilevel modulations with M>4, while for M=2,4, DS-SS has a slight advantage

Published in:

Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th  (Volume:2 )

Date of Conference:

2001