Open Access

Combining OOK with PSM Modulation for Simple Transceiver of Orthogonal Pulse-Based TH-UWB Systems

  • Sudhan Majhi1Email author,
  • A.S. Madhukumar1,
  • A.B. Premkumar1 and
  • Paul Richardson2
EURASIP Journal on Wireless Communications and Networking20082008:735410

DOI: 10.1155/2008/735410

Received: 21 November 2007

Accepted: 22 July 2008

Published: 5 August 2008

Abstract

This paper describes a combined modulation scheme for time-hopping ultra-wideband (TH-UWB) radio systems by using on-off keying (OOK) and pulse-shape modulation (PSM). A set of orthogonal pulses is used to represent bits in a symbol. These orthogonal pulses are transmitted simultaneously in the same pulse repetition interval resulting in a composite pulse. This scheme transmits the same number of bits by using fewer orthogonal pulses and receiver correlators than those used in PSM and biorthogonal PSM (BPSM). The proposed scheme reduces multiple-access interference and multipulse interference considerably by using crosscorrelation properties of orthogonal pulses. Since each bit is individually received by OOK, the proposed scheme requires less power. Hence, it is applicable for energy constrained and low-cost TH-UWB systems. The bit-error-rate (BER) performance is analyzed both mathematically and through computer simulations under the different channel environments. The performance of this scheme is compared with that of existing PSM and its combined modulation schemes by using two sets of orthogonal pulses.

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Authors’ Affiliations

(1)
School of Computer Engineering, Nanyang Technological University
(2)
Electrical and Computer Engineering, University of Michigan

Copyright

© Sudhan Majhi et al. 2008

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.