Worcester Polytechnic Institute Electronic Theses and Dissertations Collection

Title page for ETD etd-0430104-121009

Document Typethesis
Author NameAlsindi, Nayef Ali
TitlePerformance of TOA Estimation Algorithms in Different Indoor Multipath Conditions
DepartmentElectrical & Computer Engineering
  • Professor Kaveh Pahlavan, Advisor
  • Professor Wenjing Lou, Committee Member
  • Professor Fred Looft, Department Head
  • Keywords
  • indoor radio propagation
  • time of arrival estimation
  • indoor geolocation
  • super-resolution algorithms
  • Date of Presentation/Defense2004-04-26
    Availability unrestricted


    Using Time of Arrival (TOA) as ranging metric is the most popular technique for accurate indoor positioning. Accuracy of measuring the distance using TOA is sensitive to the bandwidth of the system and the multipath condition between the wireless terminal and the access point.

    In a telecommunication-specific application, the channel is divided into Line of Sight (LOS) and Obstructed Line of Sight (OLOS) based on the existence of physical obstruction between the transmitter and receiver. In indoor geolocation application, with extensive multipath conditions, the emphasis is placed on the behavior of the first path and the channel conditions are classified as Dominant Direct Path (DDP), Nondominant Direct Path (NDDP) and Undetected Direct Path (UDP). In general, as the bandwidth increases the distance measurement error decreases. However, for the so called UDP conditions the system exhibits substantially high distance measurement errors that can not be eliminated with the increase in the bandwidth of the system.

    Based on existing measurements performed in CWINS, WPI a measurement database that contains adequate number of measurement samples of all the different classification is created. Comparative analysis of TOA estimation in different multipath conditions is carried out using the measurement database. The performance of super-resolution and traditional TOA estimation algorithms are then compared in LOS, OLOS DDP, NDDP and UDP conditions. Finally, the analysis of the effect of system bandwidth on the behavior of the TOA of the first path is presented.

  • alsindi.pdf

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