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

Document Type

Article

Publication Date

1-1-2001

Abstract

In this paper 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 specific 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.

Identifier

0035191838 (Scopus)

Publication Title

IEEE Vehicular Technology Conference

External Full Text Location

https://doi.org/10.1109/VTC.2001.956964

ISSN

07400551

First Page

1191

Last Page

1195

Issue

54ND

Volume

2

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