Wireless Vehicular Safety Systems: Car-to-Car Link Improvement in Noise

Automotive industries around the world are investigating the use of 5.9GHz Dedicated Short Range Communications (DSRC) for vehicular safety and traffic management applications. This paper summarizes a potential improvement in car-to-car wireless link range when noise is present from other nearby DSRC “vehicle” transmitters (jammers) in adjacent lanes. It is shown that link range can be improved using roof antennas with coverage patterns that are less sensitive to high-noise levels from vehicles transmitting in adjacent lanes. The paper begins with a background of DENSO’s link tests. The paper then discusses transmitter noise from typical DSRC radios that degrade link range. Next, the paper introduces an idea to use antennas with shaped patterns to reduce noise and improve the range. It describes a set-up for field tests to evaluate radio links in noise, and gives test results using antennas with round and oval-shaped coverage patterns. The paper shows that shaped-pattern antennas increased the car-to-car link range by factors of 2 (single jammer) and 6 (two jammers), compared to link range with commonly used round antennas.


  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos; References; Tables;
  • Pagination: 8p
  • Monograph Title: ITS in Daily Life

Subject/Index Terms

Filing Info

  • Accession Number: 01146283
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 7 2009 11:27AM