The Comparative Analysis And Application Of The Common Wireless Radio Transmittal Model

Nowadays, the never-stop growing demand of human on resources has already caused the phenomenon of resource shortness. Recent years, as the number of wireless radio stations growing fast, the frequency resource has been tighter. With bands of various wireless broadcasting services overlapping each other, checking of frequency interference and task scheduling have become more and more important. How to coordinate the overlapping area of different frequencies and avoid the interference between different frequencies is the key to a right and rational frequency management. This is also of significant importance to the working efficiency of various businesses and communication systems. So, only the assessment of electronic environment has been carried out well, can the electronic covering ranges of wireless broadcasting stations be predicted appropriated, different bands of radio frequency well coordinated and locating and building of wireless radio stations put into implementation.The estimating analyze to wireless radio covering range is mainly about the choosing of relatively accurate model which is used in estimating of wireless radio covering range, the analyzing of covering range of different frequencies, the building of area with as larger covering range and as less radio station as possible. To do this, the entry point is the common adapting conditions of wireless radio communication model, its pros and cons and the actual local environment.There are two major parts in this paper. First, several common wireless radio communication models are introduces and comparatively analyzed, such as Free-Space Model, P.1546 Model, Okumura-Hata Model, and Egli Model. This paper is mainly based on the Radio Monitoring Station Management and Coverage Analyzing System of Shanxi Providence, with its independent sub-system Electronic Coverage Analyzing System as written resource. The comparatively analyze will be carried out from both theory and near practice simulation. In the simulating process, two different kinds of simulating data analyzing are involved-static testing and dynamic testing. Then, after the compare of previous common wireless radio communication models, one of then-Okumura Model-will is improved in this paper. Due to the sufficient supplement of information, Okumura-Hata Communication Model is widely used. Especially, the accuracy of estimation on path loss aspect of radio electronic coverage estimating system is very high, making Okumura-Hata Communication Model the criteria to the planning of land mobile communicating system nowadays. Yet, as a experiential broadcasting model drawn from large amount of testing data, Okumura-Hata is not perfect, with the possible error estimation caused by noise in actual applying environment. To make up for this shortcoming, we will give the improving model. There are five chapters, seventeen sections in this paper, elaborating the whole content.The background information and experiment data of Radio Monitoring Station Management and Coverage Analyzing System of Shanxi Providence will be detailed introduced in chapter one. In chapter two and three, comparatively analyze of both pros and cons to several common wireless radio communication models will be given, through static testing and dynamic testing in the actual environment. By analyzing to the simulations, the comparative differences in accuracy of wireless coverage estimation are shown. In chapter four, from the characteristics of radio wave, the expected results, the reason and solution to the problem in this model, the designing plan and result analyze are given. In the fifth chapter, conclusions are drawn and outlooks are given.