Unequal block for low bandwidth adaption in wireless video broadcast

2016 IEEE International Conference on Network Infrastructure and Digital Content (IC-NIDC) Pub Date : 2016-09-01 DOI:10.1109/ICNIDC.2016.7974602

Zhexin Li, Yu Liu, Yumei Wang

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引用次数: 2

Abstract

With the development of information technology, people's demand for wireless video is improved. Recently, an uncoded video transmission scheme called SoftCast was proposed for wireless video communication which provided graceful transition quality. However, when channel bandwidth is low, we need to discard some packets before transmitting to meet the requirement of bandwidth. This will cause a sharp decline on receiver video quality. This paper proposed an unequal block method (UBCAST) based on the frequency of image. UBCAST divides the lowest frequency into the biggest block to protect low frequency information, and divides the highest frequency into the smallest block which can protect low frequency packets from being discarded. What's more we can increase high frequency block proportion to improve transmission quality. And we can also increase low frequency block proportion to increase discarding packets proportion to meet the bandwidth requirement of channel. The experimental results show that when transmitting video information completely, we can improve the performance of the original SoftCast using 8∗8 block up to 2dB. When the SNR of channel is 20dB, discarding packets, we can even get a 10dB gain.

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无线视频广播中低带宽适应的不等块

随着信息技术的发展，人们对无线视频的需求不断提高。近年来，人们提出了一种用于无线视频通信的无编码视频传输方案SoftCast，该方案提供了优美的转换质量。但是，在信道带宽较低的情况下，为了满足带宽的要求，在发送之前需要丢弃一些数据包。这将导致接收机视频质量急剧下降。提出了一种基于图像频率的不等块算法(UBCAST)。UBCAST将最低频率划分为最大块以保护低频信息，将最高频率划分为最小块以保护低频数据包不被丢弃。此外，还可以通过增加高频块比例来提高传输质量。还可以通过提高低频分组比例来提高丢包比例，以满足信道的带宽要求。实验结果表明，在完全传输视频信息的情况下，使用最大2dB的8 * 8块可以提高原软播的性能。当信道信噪比为20dB时，丢弃数据包，我们甚至可以获得10dB增益。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 IEEE International Conference on Network Infrastructure and Digital Content (IC-NIDC)

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