Frequency-domain pre-equalization for MC-CDMA/TDD uplink and its bit error rate analysis

Satoshi Abe, Shinsuke Takaoka, Hiromichi Tomeba, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In multi-carrier code division multiple access (MC-CDMA) uplink (mobile-to-base station), since different users' signals go through different frequency-selective fading channels, large multi-access interference (MAI) is produced. The use of frequency-domain equalization reception can only partially restore the orthogonality among different users' signals, resulting in a severe degradation in the bit error rate (BER) performance. Hence, frequency-domain pre-equalization transmission, which equalizes the MC-CDMA signal before transmission, is recently attracting attention. In this paper, we present a generalized minimum mean square error (GMMSE) frequency-domain pre-equalization transmission suitable for MC-CDMA/TDD uplink. The pre-equalization weight is derived based on the method of Lagrange multipliers. The theoretical analysis of BER performance using the GMMSE frequency-domain pre-equalization transmission in a frequency-selective Rayleigh fading channel is presented and the result is confirmed by computer simulation.

Original languageEnglish
Pages (from-to)162-173
Number of pages12
JournalIEICE Transactions on Communications
Issue number1
Publication statusPublished - 2006 Jan
Externally publishedYes


  • Frequency-domain pre-equalization
  • Frequency-selective channel

ASJC Scopus subject areas

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


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