Design and performance analysis of TH sequences for UWB-IR systems

Gǔvenç I., ARSLAN H.

2004 IEEE Wireless Communications and Networking Conference, WCNC 2004, Atlanta, GA, United States Of America, 21 - 25 March 2004, vol.2, pp.914-919, (Full Text) identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 2
  • City: Atlanta, GA
  • Country: United States Of America
  • Page Numbers: pp.914-919
  • Keywords: Code design, Impulse radio, Multiple access, Multiuser interference, Time hopping, Ultrawideband
  • Istanbul Medipol University Affiliated: Yes

Abstract

Time hopping (TH) is commonly used with impulse radio (IR) based ultrawideband (UWB) systems as a multiple access scheme. In such systems, TH codes must be carefully designed to optimize the system performance. In this paper, TH code design for both synchronous and asynchronous UWB-IR systems are studied. For synchronous systems, a novel code assignment algorithm that depends on the number of users and delay spread of the channel is proposed. Then, the proposed codes are extended to quasi-synchronous scenarios. For asynchronous systems, frequency hopping (FH) codes obtained by finite field theory are applied to TH-IR, and their autocorrelation and crosscorrelation properties are investigated. A multiuser performance analysis method is proposed which makes use of code correlation characteristics.