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无线视频移动信道是高误码率、具有突发错误的信道,信号传输的差错严重影响视频业务的传输质量。前向纠错编码是保证信号正确传输的有效方法,级连编码将两种以上的纠错编码级连,以达到在减少硬件复杂程度的前提下来增加组长,提高纠错能力。作者提出级连编码和交错技术结合的纠错编码方案,并进行计算机模拟。结果表明在市区环境下,能使误比特率由1.925×10-2降至2.614×10-5,在重要信息比特没有出现差错时,视频传输的主观效果基本满足要求。
Wireless video mobile channel is a high bit error rate, with a burst of error channels, signal transmission errors seriously affect the quality of video services transmission. Forward error correction coding is an effective way to ensure the correct transmission of signals. Cascading codes cascade two or more error correction codes so as to increase the group leader and improve error correction ability while reducing the hardware complexity. The author proposes cascading encoding and interleaving technology combined error correction coding scheme, and computer simulation. The results show that under urban environment, the bit error rate can be reduced from 1.925 × 10-2 to 2.614 × 10-5. When there is no error in the important information bits, the subjective effect of video transmission basically meets the requirements.