Research On The Planar Motion Model And Network Capacity

Wit h the wide application of large s cale w ireless communication systems,the spatia l location of the user and the access point is often not fully deployed.Wireless Ad-Hoc networks have good self-organizat ion,dyna mic topology and non-centrality,because of the advantages of rapid networking,rapid deployment,Wire less Ad-Hoc network has become the hot spot of research at home and abroad.The strength of the received signa l and the intens ity of the interference received by the wire less Ad-Hoc network are directly dependent on the spatial posit ion of the nodes in the network,and the topology of w ire less Ad-Hoc networks and its changes are the key factors affecting the performance of w ireless networks.Therefore,this paper focuses on the research of wire less Ad-Hoc network plane mo ving model and delay,and the interference of wire less Ad-Hoc network in the communication process is analyzed.Fina lly,we evaluate the performance of the model and the network through t he network capacity.In the establis hment of t he planar mob ile model,the w ireless A d-Hoc network is based on Bid irectiona l Full-Duplex(BFD)system and IEEE802.11 DCF(RTS/C TS)standard.In this paper,the wireless Ad-Hoc network is divided into a number of links,every two nodes in the network form a pair of nodes.Two-Way Mult i Input Mult i O utput(Two-Way MIMO)techno logy is used for the trans missio n of the nodes.In this paper,the communication state is defined by t he distance between nodes.The direction of move ment is determined by the angle difference of two successive mot ions.The probabilit y distribut io n funct ion of different communication states is calc ulated,and then the pla nar moving model of w ire less Ad-Hoc network is established.In the analys is of the t ime delay o f mobile model,this paper uses the two-dimens iona l Markov mo del and queuing theory,each state of the two-dimens ional Markov model cons ists of two indexes : the number of attempts and the size of the content ion w indow.And M/G/1 queuing theory is used in channel competit ion.Fina lly,the average time delay of the mobile model is simulated and analyzed.In the evaluat ion of interference,two kinds of interference assessment methods are proposed,node inter ference evaluat ion method and link interference assessment method.The receiver node in t he node pair is taken as the research object in the node interference eva luat ion method.The receiving node is used as the center to establish the interference evaluation range,and to search the sending node which may interfere wit h the interference eva luat ion range.The nodes in the network are divided into different sets in the link inter ference evaluatio n : transmitt ing node set,receiving node set,retransmiss ion transmitt ing node set,retransmiss ion receiving node set.Analys is of the interference between sender and receiver.In this paper,the probability distribut io n funct ion o f inter ference in w ire less Ad-Hoc networks is derived and the SIR value is calculated.In this paper,wireless Ad-Hoc network mobile plane model and interference distribut io n funct ion are analyzed throu gh t he network capacit y.Because the transmiss ion capacit y of w ireless Ad-Hoc network is one of the key properties to ensure the qualit y of network service.And the outage probability,packet arriva l rate and network dela y are taken as the ma in indicators to der ive the expression of transmiss ion capacity based on Bid irectiona l Full-Duplex(BFD)in w ireless Ad-Hoc networks.The effectiveness and universalit y of t he planar model and interference analysis of wireless Ad-Hoc networks are verified by numerical simulation.