The Study Of Cellular Wireless Location Network System Communication Protocol

Cellular wireless location network becomes one of the hottest technologies in recent years for its high positioning accuracy and low cost.In this paper,I simulate the cellular wireless network transmission channel with multi-path interference and Gaussian noise. According to the signal-to-noise ratio of contrast between the original signal and the direct spread spectrum signal,it shows that the direct spread spectrum signal have a better performance on anti-multi-path interference.And in chapter 4 of this article,I give the reliazation of POCSAG protocol on mobile station in cellular wireless location network using FPGA.This article first gives a brief introduction about cellular wireless location network.And because of multi-path interference could bring a great error to cellular wireless location network.And according to my simulations,it shows that on direct spread spectrum sequence anti-multi-path performance better and PN sequence with different length have different performance. Then this article analyzes the GSM and CDMA-based methods of positioning system architecture,as well as those methods' interface and location procedure,performance and so on.And then this article shows private cellular wireless location network's characters,architecture,and connections,protocols,location procedure between base station,mobile station and network control center.In comparison of private cellular wireless location network,GSM based and CDMA based loacation methods and also GPS on performances etc. Finally,this article studies POCSAG protocol and gives an FPGA realization.