Downlink site diversity with frequency-domain equalization for a DS-CDMA cellular system

Hirotaka Sato, Hiromichi Tomeba, Kazuaki Takeda, Fumiyuki Adachi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In DS-CDMA high speed wireless signal transmissions, the bit error rate (BER) performance with coherent rake combining degrades due to inter-path interference (IPI) caused by a severe frequency-selective fading. The use of frequency-domain equalization (FDE) can significantly improve the BER performance. However, the local average received signal power slowly varies due to path loss and shadowing loss according to the movement of a mobile user. This variation degrades the link capacity particularly when the user is located close to the cell edge. To improve the link capacity, the well-known site diversity can be used in conjunction with FDE. In this paper, we present downlink site diversity with FDE for a DS-CDMA cellular system and derive the MMSE weight for site diversity combining. The downlink capacity is evaluated by computer simulation and compared to the case with coherent rake combining. Then it is shown that the link capacity with FDE is better than that with coherent rake combining.

Original languageEnglish
Title of host publication2006 IEEE Singapore International Conference on Communication Systems, ICCS 2006
DOIs
Publication statusPublished - 2006
Event10th IEEE Singapore International Conference on Communications Systems, ICCS 2006 - Singapore, Singapore
Duration: 2006 Oct 302006 Nov 1

Publication series

Name2006 IEEE Singapore International Conference on Communication Systems, ICCS 2006

Other

Other10th IEEE Singapore International Conference on Communications Systems, ICCS 2006
CountrySingapore
CitySingapore
Period06/10/3006/11/1

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Communication
  • Electrical and Electronic Engineering

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