Research On Separable UEP-LT Code

• Main Authors: Guo-Guang Yan, 顏國光
• Other Authors: Hsie-Chia Chang
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/32873334663233982940

碩士 === 國立交通大學 === 電子工程系所 === 96 === With the properties of rateless codes and the complexity of encoding and decoding almost linear to input symbol number k, LT code is especially suitable for multicast and broadcast in cellular network since the complexity of RS code is quadratic to k. For multimedia application, data with different importance must be unequally protected which is named UEP (Unequal Error Protection). As a result, we propose a method that combines UEP and LT code called separable UEP-LT code. According to required error probabilities of data with different importance, we can adjust connections between codeword packets and input symbols. Simulation results show that comparing to traditional LT code, with packet loss rates of most important symbols 10-6 and less important symbols 10-2 lower than the UEP-LT code, we only have to change encoding process but keep the same decoding process as traditional one. Note that, no more complexities are increased in both encoder and decoder.