Multipath mitigation technique using null-steering beamformer for positioning system

Seungyeun Yoo, Sangheon Kim, Dae H. Youn, Chungyong Lee

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


A multipath signal mitigation technique using a null steering beamformer is proposed. In the wireless communications, multipath signals cause the measurement errors of positioning parameters and reduce the wireless positioning accuracy. If a line of sight (LOS) signal exists, the multipath signals would have longer time delay than LOS signal. Therefore, the time delay values of received signals are ill-estimated by superposition of multipath signals. An angle of arrival (AOA) can be estimated from the reverse link using array antennas. However, the AOA measurements include not only the direction of LOS signal but also that of multipath signal. To remove the multipath signals, we use a null steering beamformer. The null steering beamformer can be used to cancel a signal from a known direction by producing a null in the undesired direction and to steer a beam to the desired direction. By repeating the null-steering beamforming for every incident angle, we can obtain the signal at each direction. With correlator, the time delay value for each direction can be estimated and the AOA of the LOS signal can be selected. The computer simulation results show that the proposed technique can reduce the delay estimation errors and angle estimation errors caused by multipath propagation.

Original languageEnglish
Pages (from-to)602-605
Number of pages4
JournalIEEE Vehicular Technology Conference
Issue number1
Publication statusPublished - 2003
Event57th IEEE Semiannual Vehicular Technology Conference (VTC2003) - Jeju, Korea, Republic of
Duration: 2003 Apr 222003 Apr 25

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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