Decision-feedback closest lattice point search for UMTS HSPA system

Byonghyo Shim, Farrokh Abrishamkar, Insung Kang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This letter considers a low-complexity multiuser detection based on the closest lattice point search (CLPS) for high speed packet access (HSPA) system. Instead of attempting to solve the ML detection problem in the presence of intersymbol and inter-cell interference, we utilize interference cancelled chips obtained from a bidirectional decision feedback operation to detect symbols. As a result, the worst case complexity of the CLPS is bounded to a controllable level irrespective of multipath spans. From the simulation on single and multi cell downlink communications in HSPA systems, we show that the proposed method offers substantial performance gain over conventional RAKE and MMSE equalizer.

Original languageEnglish
Pages (from-to)1035-1038
Number of pages4
JournalIEEE Signal Processing Letters
Issue number12
Publication statusPublished - 2009


  • Closest lattice point search
  • High speed packet access
  • Interference cancellation
  • Multiuser detection
  • Sphere decoding

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Applied Mathematics


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