Analog channel coding for wireless image/video SoftCast by data division
Xiaocheng Lin, Yü Liu, Mengyao Sun · 2015
With the widespread popularity of mobile terminals, mobile video has become an indispensable part of daily life. The conventional wireless video transmission scheme which consists of separate digital source coding and digital channel coding is now unable to meet the broadcast and mobile scenarios owing to the dramatic changes in its channel condition. However, an uncoded transmission scheme called SoftCast was recently presented to provide graceful quality transition. SoftCast is not efficient when the channel bandwidth is greater than the video bandwidth (pixels/s) by retransmission. This paper introduces Analog Channel Coding to utilize the wide bandwidth more efficiently. The transmitted data is divided into two parts: the most important part and the remainder. As the most important part can be estimated correctly at decoder side, our scheme only transmits the remainder to correct the reconstructed signal. The experimental results show that the proposed scheme can improve the performance of SoftCast by 2-5dB in wide band channel.