本文選題：視頻傳輸 + G　； 參考：《電子設(shè)計(jì)工程》2016年20期

【摘要】：介紹了一種應(yīng)用在應(yīng)急通信設(shè)備的3G視頻通話系統(tǒng)。不同應(yīng)用環(huán)境的3G,網(wǎng)絡(luò)的帶寬時(shí)變快慢以及鏈路誤碼大小變化較大,對(duì)此提出了一種自適應(yīng)傳輸控制策略,以達(dá)到在不同網(wǎng)絡(luò)環(huán)境都能有較高的帶寬占用和較好的擁塞控制。本文以丟包率,往返延遲和時(shí)延抖動(dòng)為依據(jù)將網(wǎng)絡(luò)細(xì)分為為4種狀態(tài),并分別做相應(yīng)的碼率調(diào)節(jié)。為避免高誤碼引起的不必要的碼率降低,利用累計(jì)抖動(dòng)區(qū)分丟包。并通過(guò)對(duì)網(wǎng)絡(luò)判斷參數(shù)做加權(quán)預(yù)測(cè),對(duì)不同質(zhì)量網(wǎng)絡(luò)應(yīng)用不同碼率上調(diào)條件,來(lái)減少碼率的抖動(dòng)。實(shí)驗(yàn)證明,此系統(tǒng)在不通環(huán)境中,均能較好地運(yùn)行,達(dá)到較高的帶寬占用。
[Abstract]:This paper introduces a 3G video communication system used in emergency communication equipment. In different application environments, the bandwidth of the network varies with time and speed and the size of the link error code changes greatly. In this paper, an adaptive transmission control strategy is proposed to achieve higher bandwidth occupancy and better congestion control in different network environments. Based on packet loss rate, round trip delay and delay jitter, the network is subdivided into four states, and the corresponding bit rate is adjusted. In order to avoid unnecessary bit rate reduction caused by high error code, the accumulative jitter is used to distinguish packet loss. In order to reduce the rate jitter, the weighted prediction of network judging parameters and the application of different bit rate upregulation conditions to different quality networks are carried out in order to reduce the rate jitter. The experimental results show that the system can run well and achieve high bandwidth occupation.
【作者單位】： 北京信息科技大學(xué)儀器科學(xué)與光電工程學(xué)院;北京華環(huán)電子股份有限公司;
【基金】：現(xiàn)代測(cè)控技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室開放課題資助(KF20121123207) 本科生培養(yǎng)-大學(xué)生科研訓(xùn)練(市級(jí))(PXM2014_014224_000079)
【分類號(hào)】：TN919.8
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本文編號(hào)：1782258