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无线网络信道带宽有限、误码率高且实变性强。为了平衡无线网络视频服务中相互竞争、相互制约的2个重要指标,即抗错性能和传输效率,该文从跟踪无线网络的信道状态出发,提出了一种基于PID(比例积分微分)控制技术的无线视频传输框架,自适应地跨层优化无线视频通信系统的传输效率,使其在稳定性和传输效率之间达到有效的折衷。仿真实验表明了该方法的可行性和有效性,在同等条件下传输效率比传统方法提高10%~20%,尤其在无线信道误码率变化剧烈的情况下,效果更加明显。该算法对原有编解码器改动不大,具有较强的实用性。
Wireless network channel bandwidth is limited, high bit error rate and strong adaptability. In order to balance two competing and mutually restricting wireless video services, that is, anti-error performance and transmission efficiency, this paper proposes a PID (Proportional Integral-Derivative) control technique based on tracking the channel state of wireless network. Of the wireless video transmission framework to adaptively optimize the transmission efficiency of the wireless video communication system across the layers and make it an effective compromise between stability and transmission efficiency. The simulation results show the feasibility and effectiveness of the proposed method. Under the same conditions, the transmission efficiency is improved by 10% ~ 20% compared with the traditional method. Especially when the bit error rate of wireless channel changes drastically, the effect is more obvious. The algorithm does not change the original codec, with strong practicality.