【摘要】：近年來,無線傳感器網(wǎng)絡(luò)技術(shù)已經(jīng)變得日益成熟,其物理層基礎(chǔ)是IEEE802.15.4,最初僅針對低速率、低成本、低功耗的應(yīng)用,隨著對監(jiān)控數(shù)據(jù)豐富需求的增加,節(jié)點配備有麥克風(fēng)及攝像頭的無線多媒體傳感網(wǎng)絡(luò),已經(jīng)成為研究熱點,并在邊境控制、災(zāi)害管理、應(yīng)急救援、區(qū)域通信等多領(lǐng)域發(fā)揮重要作用。本文對語音多跳傳輸技術(shù)進行研究,結(jié)合IEEE 802.15.4的低功耗與低成本特性,以及Ad-hoc網(wǎng)絡(luò)的無中心、自組織、抗摧毀等特性,設(shè)計的語音傳輸系統(tǒng)可以在目標(biāo)區(qū)域通過節(jié)點的多跳轉(zhuǎn)發(fā)實現(xiàn)語音傳輸。設(shè)計并實現(xiàn)的節(jié)點可對聲音信號進行采集、編碼、傳輸、解碼、還原。針對在低速率的無線傳感器網(wǎng)絡(luò)上傳輸較大數(shù)據(jù)量的語音數(shù)據(jù)時,節(jié)點能量、網(wǎng)絡(luò)容量、語音質(zhì)量之間矛盾的問題,提出帶有負載及能量均衡的網(wǎng)絡(luò)路由算法,設(shè)計并實現(xiàn)了帶有語音QoS的語音多跳傳輸協(xié)議。協(xié)議包括地址分配算法、最短路由算法、網(wǎng)絡(luò)維護方法、路由表結(jié)構(gòu)設(shè)計、數(shù)據(jù)包格式設(shè)計、單播以及廣播實現(xiàn)方法等等。為獲得大規(guī)模節(jié)點下協(xié)議的運行狀況,使用NS3對設(shè)計的協(xié)議進行仿真,結(jié)果表明其滿足多跳語音傳輸?shù)囊�。系統(tǒng)測試單跳視距傳輸可達200米,5個節(jié)點4跳傳輸測試丟包率在5%左右,獲得了良好的語音通話效果。設(shè)計并實現(xiàn)的低成本、低功耗的無線語音多跳傳輸系統(tǒng),其潛在應(yīng)用領(lǐng)域包括軍事通信、災(zāi)難救助、礦井通信、長距通信、區(qū)域監(jiān)控以及基礎(chǔ)通信延伸等,具有重要意義。
[Abstract]:In recent years, wireless sensor network (WSN) technology has become more and more mature. The physical layer of WSN is based on the application of low speed, low cost and low power consumption. Wireless multimedia sensor networks equipped with microphones and cameras have become a research hotspot and play an important role in border control, disaster management, emergency rescue, regional communications and other fields. In this paper, the speech multi-hop transmission technology is studied, which combines the low power and low cost characteristics of IEEE 802.15.4, as well as the characteristics of Ad-hoc network, such as no center, self-organization, anti-destruction and so on. The designed voice transmission system can transmit the voice in the target area through the multi-hop transmission of nodes. The designed and realized node can collect, encode, transmit, decode and restore the sound signal. Aiming at the contradiction among node energy, network capacity and voice quality, a network routing algorithm with load and energy balance is proposed to solve the problem of the contradiction between node energy, network capacity and speech quality when transmitting large amount of voice data in low rate wireless sensor networks. A speech multi-hop transmission protocol with voice QoS is designed and implemented. The protocol includes address assignment algorithm, shortest routing algorithm, network maintenance method, routing table structure design, packet format design, unicast and broadcast implementation method and so on. In order to obtain the running status of the protocol under large-scale nodes, the designed protocol is simulated by NS3, and the results show that the protocol meets the requirements of multi-hop voice transmission. The test results show that the system can transmit 200 meters in single hop and 5 nodes in 4 hops, and the packet loss rate is about 5%. The result of voice communication is good. The design and implementation of a low-cost, low-power wireless voice multi-hop transmission system, its potential applications include military communications, disaster relief, mine communications, long-distance communications, regional monitoring and basic communication extension, and so on.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.5;TP212.9

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相關(guān)碩士學(xué)位論文 前1條

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本文編號：2311421