Study On Location Algorithms Based On TDOA And AOA In Cellular Networks

With the rapid development of mobile communication, we have been stepping into the third generation of mobile communication recently. That will bring about the more superior quality of voice, the more colorful multimedia services and more added value service (as radio location for example). As a result, the research on location services has been a hot point.There are many location methods of mobile communication. This paper mainly discusses the basic location principles based on TOA, TDOA and AOA, location models and wireless location channel model. It also discusses the structure and key technologies of WCDMA networks that have the location function. The variety of traditional location algorithms are simulated and analyzed. In order to offset the limitation of these traditional algorithms as Chan and Taylor, the location results of Chan are used as original value of Taylor Series Expansion algorithm, and the performance of location is improved effectively.The biggest error of mobile communication location is caused by the non-line-of-sight (NLOS). The paper mainly discusses the channel model of NLOS. The popular anti-NLOS algorithms are based on the known channel information. In order to reduce the influence caused by NLOS, two modified algorithms are proposed. The first is that loose variable is introduced in TDOA location parameter. The second is that loose variables are introduced in both TDOA and AOA location parameters. The two modified algorithms are simulated. The results demonstrate that the NLOS influence is reduced and the performance of location is improved without the known channel information.This paper also proposed a modified mobile location model based on data...