Research Of Indoor Environment Short-distance Wireless Channel Staticstis Characteristics

Communication is the sender transmitter information to the receiver by some media on acertain format to achieve a certain purpose, communication technology has bring our lives somuch surprises and conveniences from the ancient flying pigeon preach books, fire alarm tomodern radio, mobile phone, the rapid development of the Internet, it has been made thedistance between person and person closer, change the way of people’s life propounded,improve the economic efficiency.Survey shows that70%of human activities are in the room, and all kinds of low powerconsumption, low cost short-range wireless technology is widely used, also with "the thing"as the core content of the development of a network, which makes the understanding ofindoor wireless channel has become a necessity.However, compared with outdoor model, indoor wireless channel more easily affected byindoor items putting, human activity and uncertain factors, so there has been no certainchannel model can be used to describe the indoor environment, therefore, the study on indoorwireless channel characteristic study is meaningful.This study combined the theoretical analysis and practical test method together, the contentincludes two partsFirst，Theoretical model simulation. Several characteristics of indoor radio wavespropagation though the indoor environment analysis under indoor condition could be draw:one，signal emission is surrounded by walls under indoor environment, almost "go and seestop", it can’t be seen as free space approximately; two, interior space is limited and thereceived signal amplitude is sensitive on changes in distance, wave arrival angle can’t beapproximately0, the angle can be expend to180degrees; three, indoor conditions, the stayingand moving of human, even or odd number are influenced signal receiving. We cannot ignorethem.Then, the actual test: build test environment, test, test data analysis, the supplementarytest, draw actual model according to the measured data, simulation model compared with the actual model, get the indoor distance attenuation factor and distance attenuation fitting curveunder all kinds of conditions conclusion, and wireless channel statistics distribution underindoor condition.This thesis combined theory analysis with practical test to establish a wireless channelmodel which are more conform to the indoor application environment, Draw conclusionsbelow: First, loss trend of signal path against a certain distance fromthe antenna location issubstantially the same with the loss trend of outdoor environments.Second, the path lossconcerning about distance are more susceptible to the walls, materials of goods, shape andsize of decorations which made the path loss may increase or slow under indoor environment.Third, under indoor environment, the deep fading region can be predicted against the locationof antenna, realize the design of optimizing indoor distribution system coupled with theanalysis of user behavior.The research results abovecan be used on System Performance Test,analysis, evaluation,and can providedimportant basis onnetworkdistributionof indoor short distances covering.