ABSTRACT
The end-to-end performance of wireless communications depends on the effective processing in both the source and the channel. In practical communications systems, source coding is handled at the application layer, mostly for multimedia contents, and channel coding is most commonly performed at the physical layer (PHY). Guided by Shannon’s separation principle, source coding and channel coding are usually accomplished independently. Hence, an implicit assumption at PHY is that the data to be transmitted are compressed source without redundancies. Contrary to this assumption, numerous applications inject uncompressed data into the network (e.g., e-mails, Web pages, and uncompressed files). The measurement on web pages [344] shows that there exist a substantial amount of compressible data in practical networking traffic. Undoubtedly, intelligently utilizing data redundancy in transmission will greatly boost communication efficiency.
