Baseband Design of Broadband Wireless ad hoc Network and Cross-layer Optimization of Transmission Power Control WeiChun1, LiMing2,a

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1 4th Natonal Conference on Electrcal, Electronc and Computer Engneerng (NCEECE 205) Baeband Degn of Broadband Wrele ad hoc Network and Cro-layer Optmzaton of ranmon Power Control WeChun, LMng2,a School of Electronc and Informaton Engneerng, Wuhan Donghu Unverty, Wuhan 4302, Chna; 2 Informaton management center, Ar Force Early Warnng Academy, Wuhan 43009, Chna a AFEWA_LM@63.com Keyword: wrele ad hoc, tranmon power, load capacty, cro layer optmzaton, throughput effcency Abtract. he capacty and tranmon power of the wrele ad hoc network are lmted, o the key to tudy n the feld of ad hoc network how to ue the capacty of the node and mprove the performance of the network. Baed on the reearch of tradtonal layered protocol, a new cro layer optmzaton method propoed, whch baed on the network capacty and tranmon power. he OFDM technology ntroduced nto the elf-organzaton network. he MAC protocol can be tranmtted to the tranmon layer, o that the CP protocol can dtnguh the network congeton. Ung the OPNE oftware, the mulaton experment are carred out. he reult how that the tranmon power of the cro layer optmzaton method can effectvely optmze the network, reduce the tme to wat for the tme, mprove the average throughput effcency, and acheve the ame effect a the packet lo. Introducton Wrele ad hoc network a mult hop temporary autonomou ytem, whch compoed of a group of moble node wth wrele trancever. It not requred to et up the network nfratructure. he network flexble and can be mult hop topology. However, the capacty of the network lmted and the tranmon power lmted, o t needed to mprove the performance of ad hoc network by ung network optmzaton. How to ave the energy cot of node, mprove the capacty of lnk load, and effcent utlzaton of the network node, are the key problem whch retrct the reearch and development of elf organzaton network. Degn prncple of capacty and power control for Wrele Ad Hoc Network Wrele ad hoc network protocol tack can be dvded nto 5 layer, ncludng phycal hardware layer, data lnk layer, network layer, tranport layer and applcaton layer, network capacty and tranmon power control the preme of enurng communcaton qualty, by ncreang the network load, adjut the tranmon power, realze the network power conumpton, mprove the network throughput effcency, baed on tranmon power cro layer optmzaton of network control framework tructure hown n Fgure he author - Publhed by Atlant Pre 59

2 Fg. Flow chart of Wrele Ad Hoc Network capacty and tranmon power optmzaton Fgure how the capacty of wrele ad hoc network and the tranmon power of cro layer optmzaton. he proce dvded nto x tep. he frt to defne the network, uch a throughput capacty, lnk utlzaton, equpment effcency, network delay, packet lo and other data, and then ue OPNE oftware to etablh a network mulaton model, whch nclude elf organzaton network, network topology and protocol. After the mulaton model bult, the data collected, and the mulaton reult are fnhed. hen, the network optmzed to carry out the cro layer optmzaton of bae band capacty and tranmon power, and then debug and mulaton. Cro layer optmzaton of Baeband Degn and tranmon power for Wrele Ad Hoc Network he baeband ubytem alo a part of the wrele elf-organzng network. he baeband ubytem can receve data from multple acce ubytem, and the receved data ent to the dgtal ntermedate frequency ytem. At the ame tme, the baeband ubytem receve the data whch proceed by the ntermedate frequency ub ytem, and the data tranmtted to the multple acce ubytem. In the actual communcaton proce, from the gnal tranmtter to receve gnal the end of the path and not only, thu caue multpath effect, the gnal delay, ncreae tranmon lne load negatvely, o a to reduce the tranmon power, whch nfluence the capacty of wrele ad hoc network. In order to olve th problem, the OFDM technology ntroduced nto the network organzaton, wthn one OFDM ymbol contan multple ub gnal va the modulaton of the carrer wave, the ymbol can be expreed a ( t) N = = d rect( t t, t / 2 rect( t) = 0, t = other / 2) exp( j2pf ( t t )), t t t + () 60

In th formula (), N the number of ubcarrer and the ymbol duraton, d repreent the -th ub gnal load wave value, f the -th ub carrer wave frequency, the formula of f a follow f = f + (2) c / he

3 In th formula (), N the number of ubcarrer and the ymbol duraton, d repreent the -th ub gnal load wave value, f the -th ub carrer wave frequency, the formula of f a follow f = f + (2) c / he demodulaton proce proformed for m ub gnal n the formula (), n the t tme, after the ntegral proceng, the formula (3) can be obtaned, m N + t r = exp[ j2p ( t t d j t t dt )] exp[ 2p ( )] = (3) N + t m = d exp[ j2p ( t t dt dm )] = = For the phycal layer power control, the urvval tme and capacty of a wrele node depend on the battery capacty and power conumpton, and the battery capacty can not be mproved. he control of power and node capacty nclude the ntroducton of the wtch and the energy avng mode of the wrele network card, whch can be realzed by changng the clock frequency of CPU and the peed of the hard dk. he cro layer power control the control of the tranmon power to each protocol layer, and the optmzed degn of the network realzed by cro layer optmzaton. Cro layer optmzaton method dvded nto two knd, one the low level of nformaton feedback to hgh-level, uch a the MAC layer of network data packet feedback to the tranmon layer, o that the CP protocol can dtnguh the network congeton, the econd method to bundle many protocol, a protocol to another protocol. Smulaton of wrele ad hoc network optmzaton degn In order to mprove the capacty and performance of wrele ad hoc network, the archtecture of computer and communcaton network requred to tet the performance of the ytem. In order to mplement the OPNE oftware, the mulaton model of the wrele ad hoc network bult, whch hown n Fgure 2. Fg. 2 OPNE wrele ad hoc network mulaton model Fgure 2 how that the wrele ad hoc network mulaton model, whch bult by OPNE oftware, often a data packet lo problem n ad hoc network. Ung tranmon power cro layer optmzaton method can effectvely optmze the network, reduce the tme to wat for a long tme, mprove the average throughput effcency, to acheve the ame effect a the packet lo. 6

Fg. 3 he real-tme average throughput rate of elf organzaton network optmzaton It how n Fg. 3 that the average throughput curve of the real-tme network under the optmzed cene of the organzaton network.

4 Fg. 3 he real-tme average throughput rate of elf organzaton network optmzaton It how n Fg. 3 that the average throughput curve of the real-tme network under the optmzed cene of the organzaton network. he frt knd of method ued, the low level nformaton feedback to the hgh level, the MAC layer of the network data packet feedback to the tranmon layer, o that the CP protocol can dtnguh the network congeton, mprove the network' capacty. Fg. 4 he average load dagram before and after optmzaton Fgure 4 how the average load curve of the network, whch can be een by the graph, the average load of the network mproved, and the load capacty of the network mproved. Concluon Load capacty and power control a typcal cro layer optmzaton problem. A good load capacty and power control cheme can effectvely reduce the power conumpton of ad hoc network, mprove the capacty of network throughput, and effectvely ncreae the tranmon rate of packet. h paper preent a new method of cro layer tranmon power optmzaton baed on the bae band degn, whch can be optmzed accordng to the network ytem' contrant and network tranmon charactertc. Ung OPNE oftware for modelng and Smulaton of the network, the network optmzaton method propoed n th paper can effectvely control the network delay and acheve the ame throughput capacty a the packet lo. 62

5 Reference [] Lu Yanlng,Wu Welng. Applcaton of mart antenna n CDMA network plannng and optmzaton. Wrele communcaton technology, Vol.2 (), (2003): p [2] Da Qnyun, Hu Xuln, Zhang Yunyu. Reearch on the capacty and delay performance of wrele AdHoc network [J].Communcaton technology, Vol.3,(2),(2005): p [3] Yang Wejng, Zhang Jngzhou, Zhang Anxang. Reearch and applcaton of fuzzy adaptve PID control,computer Smulaton, Vol.26 (9),(2009): p [4] Xu Jun Je, Chen Le, Dong Xnmn. Baed on ZgBee vbraton montorng wrele enor network. Machne and hydraulc, Vol.38 (22), (200): p [5] Pang Na, Cheng Defu. Degn of greenhoue montorng ytem Baed on ZgBee wrele enor network. Journal of Jln Unverty, Vol.28 (),(200) : p [6] Lu Jun, L Zhe, Yue Le. Degn and mplementaton of elf organzaton network mulaton platform. computer cence, Vol.35 (),(2008): p.24-26,30. [7] Zhao Xaogang, Zhu Fengxan, Wu D. Reearch and Realzaton of UAV Ad Hoc Network Smulaton n a Rencounter Scenaro. Journal of Sytem mulaton,vol.20(23),(2008): p , [8] Zhu Zhjun, Le Zchun, Zhu Ran. Reearch and mplementaton of OBS network mulaton platform baed on NS2. Journal of communcaton, Vol.30 (9),(2009), p [9] Zhou Ytng, Lng Zhhao, Wu Qnqn.Dcuon on ZgBee wrele communcaton technology and t applcaton. Automaton ntrumentaton, Vol.26 (6), (2005): p.5-9 [0] Da Yuan, Yang Long, He Dongjan. Applcaton of ZgBee n crop cultvaton envronment montorng ytem. Mcro computer nformaton, Vol.25 (-2), (2009): p [] Cao Yuanjun,Wang Xnzhong, Yang Janquan. Reearch on. baed on feld meteorologcal montorng ytem baed on wrele enor network, Vol.2,(2008): p [2] Hu Nanmu, L Yonggang, Wang Cheng. Wrele feld meaurement and control ytem baed on Zgbee. Mcro computer nformaton, Vol.24 (8-3), (2008): p

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