The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Novel Multiple Access Schemes for IEEE 802.15.4a Low-rate Ultra-wide Band Systems

  • Zhang, Hong (Mobile Telecommunications Research Lab. The Graduate School of Information Technology & Telecommunications, Inha University) ;
  • Hui, Bing (Mobile Telecommunications Research Lab. The Graduate School of Information Technology & Telecommunications, Inha University) ;
  • Chang, Kyung-Hi (Mobile Telecommunications Research Lab. The Graduate School of Information Technology & Telecommunications, Inha University)
  • 휘빙 (인하대학교 정보통신대학원) ;
  • 장홍 (인하대학교 정보통신대학원) ;
  • 장경희 (인하대학교 정보통신대학원)
  • Received : 2010.04.30
  • Accepted : 2010.07.01
  • Published : 2010.07.31
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Abstract

The IEEE 802.15.4a specification targets the low-rate (LR) Impulse-radio (IR) ultra-wideband (UWB) system which is now widely applied in the WPANs considering rather short distance communications with low complexity and power consumption. The physical (PHY) layer uses concatenated coding with mixed binary phase-shift keying and binary pulse-position modulation (BPSK-BPPM), and direct sequence spreading with time hopping in order that both coherent and non-coherent receiver architectures are supported. In this paper, the performances of multiple access schemes compliant with IEEE 802.15.4a specification are investigated with energy detection receiver, which allow avoiding the complex channel estimation needed by a coherent receiver. However, the performance of energy detection receiver is severely degraded by multi-user interference (MUI), which largely diminishes one of the most fascinating advantages of UWB, namely robustness to MUI as well as the possibility to allow parallel transmissions. So as to improve the performance of multiple access schemes, we propose to apply the novel TH sequences as well as to increase the number of TH positions. The simulation results show that our novel multiple access schemes significantly improve the performance against MUI.

Keywords

References

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