A new pre-processing technique to enhance single-user-type DS-CDMA detectors in "blind" space-time rake receivers

Kainam Thomas Wong, Petr Tichavský, Shun Keung Cheung, Guisheng Liao

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Proposed herein is a pre-processing technique applicable to maximum-SINR beamformers for "blind" space-time rake receivers in "single-user"-type DS-CDMA detection. This smart-antennas signal-processing technique enhances the constructive summation of multipaths and the rejection of co-channel interference, both of which decrease the bit-error-rate and lower the error-floor of the cellular uplink's near-far problem at high SNR. This technique is "blind" in that it needs neither prior knowledge nor explicit estimation of (1) the channel-faded multipaths' arrival angles, relative arrival delays or power profiles, (2) the receiving antenna array's nominal or actual gain-phase-polarization response, and (3) the co-channel multi-access users' signature-spreading codes. Monte Carlo simulations show that the proposed scheme can enhance the output-SINR by 1-10 dB. A mathematical analysis shows this proposed pre-processing scheme to always improve the asymptotic output-SINR. A formula is analytically derived to predict this asymptotic output-SINR. This formula lies within 7dB of limited simulation results at an input-SIR above -7dB and a chip-rate space time-sampling, but the formula is less accurate otherwise.
Original languageEnglish
Article number1705955
Pages (from-to)2932-2944
Number of pages13
JournalIEEE Transactions on Wireless Communications
Issue number10
Publication statusPublished - 1 Oct 2006


  • Antenna arrays
  • Array signal processing
  • Communication system performance
  • Inter-symbol interference
  • Interference suppression
  • Land mobile radio diversity systems
  • Mobile communication
  • Pseudo-noise coded communication
  • Spread spectrum communication

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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