Collision resolution in packet radio networks using rotational invariance techniques

Ruifeng Zhang, Nicholas D. Sidiropoulos, Michail K. Tsatsanis

Research output: Contribution to journalArticle

59 Scopus citations


This paper deals with the multiuser medium access problem in the packet radio environment. Under the framework of network diversity multiple access (NDMA), a recently proposed medium access method, a blind collision resolution scheme is proposed employing rotational invariance and factor analysis techniques. The proposed approach (dubbed B-NDMA for Blind NDMA) overcomes the difficulty of orthogonal identification codes required by the original protocol, thereby improving channel utilization and system capacity, while being insensitive to multipath effects and synchronization errors. Performance issues of the proposed technique are addressed both analytically and numerically.

Original languageEnglish (US)
Pages (from-to)146-155
Number of pages10
JournalIEEE Transactions on Communications
Issue number1
StatePublished - Jan 1 2002


  • Access protocols
  • Blind signal separation
  • Matrix decomposition
  • Packet radio
  • Rotational invariance

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