Coding for the variably coherent channel

This talk introduces the concept of coding for variable channel coherence. The need for this type of coding arises naturally in the multiuser broadcast channel since the more mobile a terminal, the harder it is to maintain coherence. The talk shows that noncoherent users can be accommodated without loss to the overall capacity, as long as there are not too many of them. This derivation leads naturally to an efficient (capacity lossless) method of using codes designed for memoryless channels on channels with memory.