Near-far problem in spread-spectrum road-automobile communications

E. Soljanin, C. N. Georghiades

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In a multiple user radio communication system, a particular roadside beacon communicates simultaneously with the vehicles that are randomly distributed in the area assigned to the beacon. This spatial distribution means different distances of different vehicles to the beacon, which causes different power attenuations. If the received signal energies are very dissimilar, i.e., some users are very weak (vehicles far form the beacon) in comparison to the others (vehicles near the beacon), then the conventional single-user detector is unable to recover the messages of the weak users reliably, even if the signature waveforms have very low crosscorrelations. This is known as the near-far problem. We solve this problem by resorting to recently developed linear decorrelating detectors which are practical to implement and, although not optimal, able to handle the near-far problem.

Original languageEnglish (US)
Title of host publicationProceedings of the American Control Conference
PublisherPubl by American Automatic Control Council
Number of pages2
ISBN (Print)0780302109, 9780780302105
StatePublished - 1992
Externally publishedYes
EventProceedings of the 1992 American Control Conference - Chicago, IL, USA
Duration: Jun 24 1992Jun 26 1992

Publication series

NameProceedings of the American Control Conference


OtherProceedings of the 1992 American Control Conference
CityChicago, IL, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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