Joint Source-Channel Coding in Gaussian Fading Channels

Speaker: Prof. Giuseppe CaireAbstract: Multicasting a common "analog" source over a wireless channel to a large number of users is still the main application of wireless communications. Analog FM for audio, AM-SSB for TV, DTV and DAB are practical example of this problem. Shannon's separation theorem has driven the design of today's digital multicasting systems. Unfortunately, separate design and operations of source compression and channel coding might put unnecessarily tight constraints on the channel post-decoding error probability. These constraints require practical systems to back off from the theoretical limits. Furthermore, when multicasting to a large set of users in different (fading) channel conditions, the sharp threshold effect of digital systems designed according to the separation principle is not desirable. On the contrary, a "graceful degradation" effect that emulates the behavior of analog systems is more suited for this scenario.In this talk, I shall present some recent advances in Joint Source Channel Coding applied to the wireless channel. The talk is aimed at presenting on-going work, in an informal and hopefully stimulating format.

Location: Hughes Aircraft Electrical Engineering Center (EEB) - -248

Audiences: Everyone Is Invited

Contact: Mayumi Thrasher