Decision feedback chip-level maximum likelihood detection for DS-CDMA in a frequency-selective fading channel

Akihiro Saito, Shinsuke Takaoka, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

Abstract

In direct sequence code division multiple access (DS-CDMA), variable rate transmission can be realized by simply changing the spreading factor SF for the given chip rate. In a frequency-selective fading channel, the transmission performance can be improved by using rake combining. However, when a very low SF is used for achieving a high transmission rate, error floor is produced due to insufficient suppression of inter-chip interference (ICI). In this paper, decision feedback chip-level maximum likelihood detection (DF-CMLD) is proposed that can suppress the ICI. An upper-bound for the conditional bit error rate (BER) is theoretically derived for the given spreading sequence and path gains. The theoretical average BER performance is numerically evaluated by Monte-Carlo numerical computation using the derived conditional BER. The numerical computation results are confirmed by computer simulation of DS-CDMA signal transmission with DF-CMLD.

Original languageEnglish
Pages (from-to)2564-2571
Number of pages8
JournalIEICE Transactions on Communications
VolumeE89-B
Issue number9
DOIs
Publication statusPublished - 2006

Keywords

  • DS-CDMA
  • Frequency-selective fading channel
  • Maximum likelihood detection
  • Rake combining

ASJC Scopus subject areas

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

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