2-Step maximum likelihood channel estimation for multicode DS-CDMA with frequency-domain equalization

Yohei Kojima, Kazuaki Takeda, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can provide better downlink bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) than the conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. In this paper, we propose a new 2-step maximum likelihood channel estimation (MLCE) for DS-CDMA with FDE in a very slow frequency-selective fading environment. The 1st step uses the conventional pilot-assisted MMSE-CE and the 2nd step carries out the MLCE using decision feedback from the 1st step. The BER performance improvement achieved by 2-step MLCE over pilot assisted MMSE-CE is confirmed by computer simulation.

Original languageEnglish
Pages (from-to)2065-2071
Number of pages7
JournalIEICE Transactions on Communications
VolumeE92-B
Issue number6
DOIs
Publication statusPublished - 2009 Jun

Keywords

  • Channel estimation
  • DS-CDMA
  • Frequency-domain equalization
  • MMSE

ASJC Scopus subject areas

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

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