Multiuser detection for out-of-cell cochannel interference mitigation in the IS-95 downlink

D. Richard Brown, H. Vincent Poor, Sergio Verdu, C. Richard Johnson

Research output: Contribution to journalArticlepeer-review


This paper considers the application of multiuser detection techniques to improve the quality of downlink reception in a multi-cell IS-95 digital cellular communication system. In order to understand the relative performance of suboptimum multiuser detectors including the matched filter detector, optimum multiuser detection in the context of the IS-95 downlink is first considered. A reduced complexity optimum detector that takes advantage of the structural properties of the IS-95 downlink and exhibits exponentially lower complexity than the brute-force optimum detector is developed. The Group Parallel Interference Cancellation (GPIC) detector, a suboptimum, low-complexity multiuser detector that also exploits the structure of the IS-95 downlink is then developed. Simulation evidence is presented that suggests that the performance of the GPIC detector may be near-optimum in several cases. The GPIC detector is also tested on a snapshot of on-air data measured with an omnidirectional antenna in an active IS-95 system and is shown to be effective for extracting weak downlink transmissions from strong out-of-cell cochannel interference. The results of this paper suggest that the GPIC detector offers the most performance gain in scenarios where weak downlink signals are corrupted by strong out-of-cell cochannel interference.

Original languageEnglish (US)
Pages (from-to)217-233
Number of pages17
JournalJournal of VLSI Signal Processing Systems for Signal, Image, and Video Technology
Issue number1-3
StatePublished - 2002

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Information Systems
  • Electrical and Electronic Engineering


  • Code division multiple access (CDMA)
  • IS-95 downlink
  • Interference cancellation
  • Multiuser detection


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