Using a spectrum estimation method to be used in estimating the signal reception time in the rail channel and using a genetic algorithm to estimate the user's location in the UMTS system
Subject Areas : Electronics EngineeringMorteza Bayat 1 , Mohsen Najafi 2
1 - Azad University of Arak
2 - Arak University of Science and Technology
Keywords:
Abstract :
With the increasing need for location-dependent services and the proliferation of wireless networks aware of the user's location, location techniques in wireless networks have also become doubly important. TOA and TDOA-based location estimation methods are the most popular location methods and the accuracy of location in these methods naturally depends on the accuracy of TOA estimation. The accuracy of TOA estimation using conventional methods such as the maximum magnification criterion or the maximum posterior probability in different propagation environments is problematic, especially when there is no direct line of sight between the transmitter and receiver or the direct path signal is not the strongest received signal. As a result, in these conditions, there is a need for methods that have the ability to separate more and more accurately the received signals from different propagation paths in the time domain. For this reason, in this article, we review the MUSIC method, which is a method with high resolution. The results of this paper show that by having the difference in signal reception time (delay obtained by MUSIC method), to determine the user's location, the resulting hyperbolic equation can be solved by genetic algorithm and the user's location can be determined with higher accuracy and convergence speed.
_||_