No abstract

No abstract

No abstract

No abstract

No abstract

ecently there has been excitement in the image processing and communication fields about dirty-paper coding. This name comes from "Writing on Dirty Paper," the title of a 1983 paper by Max Costa [1] on the capacity of a Gaussian channel having interference that is known to the transmitter y s i w = + + (1)

The fading channel is a significant problem in many communications environments. In this paper, we examine the performance of unitary space-time modulation in a time-varying channel. We use a Gauss-Markov model of the continuously varying channel to characterize performance of differential and trained modulation. We find a performance ceiling at high SNR where the effect of the changing channel dominates. We show that while trained modulation provides an advantage at low SNR, above a certain SNR differential modulation gives better performance. We conclude with simulation results that support our analysis.

No abstract