量化因子在IEEE 802. 11 b/e无线局域网视频流传输中的图像质量性能仿真研究

在NS2-MyEvalvid模型基础上分析了量化因子对传输图像质量性能的影响,并在NS2平台上通过仿真实现了基于Evalvid机制的视频流在无线局域网环境下的传输,总结归纳了编码相关参数仿真视频流在无线网络图像传输过程中的一般方法,通过改变编码的量化因子,得到了在多速率无线局域网环境(802.11b/e)下视频流传输的图像平均延迟和平均PSNR值.分析表明,802.11e在视频流传输性能上比802.11b具有更好的表现.

Study on the Effect of Quantization Factors on Transmission of Video Streams through IEEE Simulation of Image Quality Performance in802. 11 b/e Wireless Local Area Networks

Based on NS2-MyEvalvid, an analysis was conducted on the effect of quantization factors upon the performance of image transmission in this paper. And by simulation, the successful transmission of the video streams grounded on Evalvid mechanism in Wireless Local Area Networks (WLAN) was achieved. A summary of the method to simulate the image transmission process of video streams in WLAN by encoding the related parameters was also provided. Furthermore, by means of changing the encoded quantization factors, the average data of the delay of image and PSNR during the transmission of video streams in multirate WLAN was got, together with a conclusion that 802.11e will guarantee a better transmission performance of video streams than 802. 11b.