On the performance of linear parallel interference cancellation

D. Richard Brown, Mehul Motani, Venugopal V. Veeravalli, H. Vincent Poor, C. Richard Johnson

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


This paper analyzes the performance of the linear parallel interference cancellation (LPIC) multiuser detector in a synchronous multiuser communication scenario with binary signaling, nonorthogonal multiple access interference, and an additive white Gaussian noise channel. The LPIC detector has been considered in the literature lately due to its low computational complexity, potential for good performance under certain operating conditions, and close connections to the decorrelating detector. In this paper, we compare the performance of the two-stage LPIC detector to the original multistage detector proposed by Varanasi and Aazhang for CDMA systems. The general M-stage LPIC detector is compared to the conventional matched filter detector to describe operating conditions where the matched filter detector outperforms the LPIC detector in terms of error probability at any stage M. Analytical results are presented that show that the LPIC detector may exhibit divergent error probability performance under cert ain operating conditions and may actually yield error probabilities greater than 0.5 in some cases. Asymptotic results are presented for the case where the number of LPIC stages goes to infinity. Implications of the prior results for code division multiple access (CDMA) systems with random binary spreading sequences are discussed in the "large-system" scenario. Our results are intended to analytically corroborate the simulation evidence of other authors and to provide cautionary guidelines concerning the application of LPIC detector to CDMA communication systems.

Original languageEnglish (US)
Pages (from-to)1957-1970
Number of pages14
JournalIEEE Transactions on Information Theory
Issue number5
StatePublished - Jul 2001

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences


  • Code division multiple access (CDMA)
  • Communication theory
  • Interference cancellation
  • Multiaccess communication
  • Multiuser detection


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