Performance comparison of delay transmit diversity and frequency-domain space-time coded transmit diversity for orthogonal multicode DS-CDMA signal reception using frequency-domain equalization

Takeshi Itagaki, Kazuaki Takeda, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In a severe frequency-selective fading channel, the bit error rate (BER) performance of orthogonal multicode DS-CDMA is severely degraded since the orthogonality property of spreading codes is partially lost. The frequency-selectivity of a fading channel can be exploited by using frequency-domain equalization to improve the BER performance. Further performance improvement can be obtained by using transmit diversity. In this paper, joint transmit diversity and frequency-domain equalization is presented for the reception of orthogonal multicode DS-CDMA signals in a frequency-selective fading channel. As for transmit diversity, delay transmit diversity (DTD) and frequency-domain space-time transmit diversity (STTD) are considered. The achievable BER performance of multicode DS-CDMA in a frequency-selective Rayleigh fading channel is evaluated by computer simulation. It is shown that the frequency-domain STTD significantly improves the BER performance irrespective of the degree of the channel frequency-selectivity while DTD is useful only for a weak frequency-selective channel.

Original languageEnglish
Pages (from-to)2719-2728
Number of pages10
JournalIEICE Transactions on Communications
VolumeE87-B
Issue number9
Publication statusPublished - 2004 Sep

Keywords

  • Frequency-domain equalization
  • MMSE
  • Multicode DS-CDMA
  • Transmit diversity

ASJC Scopus subject areas

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

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