An Enhanced Time-based Wireless Indoor Localization Using Synchronized TDoA Technique

The lack of standard positioning system for wireless networks is the major problem for accurate position estimation of indoor environments. The imperfection of the existing localization techniques and applied wireless technologies may restrict the performance of indoor positioning system. In addition, indoor localization accuracy may be limited by some issues such as structural design of building, indoor decoration of building, and location of building which may cause inaccessibility and unavailability of using GPS. Due to the popularity of time-based indoor positioning in recent researches, an enhanced time-based wireless indoor localization scheme is proposed in this paper. The main challenge of using time-based indoor localization techniques is the necessity to consider how to achieve definite time synchronization among wireless nodes. To overcome this challenge, the proposed scheme uses synchronized Time-Difference-of-Arrival (TDoA) technique which is based on an effective hybrid RBS-PBS synchronization protocol. Simulation evaluations and performance comparisons are provided with various parameters to demonstrate the improved performance of proposed scheme by using Python programming.