Research On Fountain Codes Technology In Wireless Multimedia Transmission

Fountain codes is a new kind of application layer-forward error correction technology. With its great technology advantages, fountain codes has drawn increasingly attention nowadays and has been applied to many cases. However, the performance of LT codes and Raptor codes when the code length is small is not excellent enough, and decoding of them will take a lot of memory resources when the code length is large, so it is not feasible to apply them to wireless multimedia transmission cases. In this thesis, we focus on the fountain codes technology in wireless multimedia transmission cases. The main work is as follows:First, we discussed the concepts of fountain codes, and introduced binary random linear codes, LT codes, Raptor codes. We also described the encoding and decoding of these codes.Secondly, we researched on fountain codes which is applicable to wireless multimedia transmission. We discussed the encoding and OFG decoding algorithm of GF(m) random linear codes, made a theoretical derivation of its decoding probability and decoding complexity, and made a simulation analysis on its decoding overhead. We also proposed a optimization scheme of the GF(m) random linear codes, and give the suggestion of parameter picking when using GF(m) random linear codes in wireless multimedia transmission cases.Again, we researched on a proxy server-based application scheme for wireless multimedia transmission. We researched on the design of the proxy server software using in the scheme and made an analysis of its key technologies.Finally, we build a test platform and made a test on using GF(256) random linear codes in wireless multimedia transmission, the results showed that when code length is4, GF(256) random linear codes has excellent performance and is suitable for wireless multimedia transmission.