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

Author

Zhao, Li ; Haimovich, Alexander M.

Author_Institution

Dept. of Electron. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ, USA

Volume

2

fYear

2001

fDate

6/23/1905 12:00:00 AM

Firstpage

1191

Abstract

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

Keywords

AWGN channels; channel capacity; pulse position modulation; spread spectrum communication; FCC Part 15 rules; M-ary PPM; SNR; UWB communications; additive white Gaussian noise channel; channel capacity; multilevel modulations; power spectrum density limitation; pulse position modulation; signal to noise ratio; spreading ratio; ultra-wideband communications; AWGN; Additive white noise; Bandwidth; Channel capacity; FCC; Interference constraints; Phase shift keying; Pulse modulation; Signal to noise ratio; Ultra wideband technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th

Conference_Location

Atlantic City, NJ

ISSN

1090-3038

Print_ISBN

0-7803-7005-8

Type

conf

DOI

10.1109/VTC.2001.956964

Filename

956964