Wideband wireless access based on DS-CDMA

Fumiyuki Adachi, Mamoru Sawahashi

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


Wideband wireless access based on direct sequence code division multiple access, called coherent multi-rate W-CDMA in this paper, designed for next generation mobile communications systems is introduced. It employs inter-cell asynchronous operation with a fast cell search algorithm, orthogonal multi-spreading factor (SF) forward links, and pilot symbol assisted coherent reverse and forward links. Inter-cell asynchronous cell site operation facilitates the continuous deployment of the system from outdoors to indoors. An orthogonal multi-SF forward link allows flexible offering of different multi-rate services to users without losing orthogonality. Gains in the radio link capacity and coverage are obtained from the use of coherent Rake combining and fast transmit power control (TPC) in both forward and reverse links. Computer simulation and field experiment results of the coherent multi-rate W-CDMA radio link performance are presented. Also presented are interference cancellation and adaptive antenna array techniques that can significantly improve the link capacity and coverage.

Original languageEnglish
Pages (from-to)1305-1316
Number of pages12
JournalIEICE Transactions on Communications
Issue number7
Publication statusPublished - 1998
Externally publishedYes


  • Mobile communications
  • Wideband wireless access

ASJC Scopus subject areas

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


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