本文選題：視頻傳輸 + G　； 參考：《電子設計工程》2016年20期

【摘要】：介紹了一種應用在應急通信設備的3G視頻通話系統。不同應用環(huán)境的3G,網絡的帶寬時變快慢以及鏈路誤碼大小變化較大,對此提出了一種自適應傳輸控制策略,以達到在不同網絡環(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,往返延遲和時延抖動為依據將網絡細分為為4種狀態(tài),并分別做相應的碼率調節(jié)。為避免高誤碼引起的不必要的碼率降低,利用累計抖動區(qū)分丟包。并通過對網絡判斷參數做加權預測,對不同質量網絡應用不同碼率上調條件,來減少碼率的抖動。實驗證明,此系統在不通環(huán)境中,均能較好地運行,達到較高的帶寬占用。
[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】： 北京信息科技大學儀器科學與光電工程學院;北京華環(huán)電子股份有限公司;
【基金】：現代測控技術教育部重點實驗室開放課題資助(KF20121123207) 本科生培養(yǎng)-大學生科研訓練(市級)(PXM2014_014224_000079)
【分類號】：TN919.8
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本文編號：1782258