On Interchannel Correlation in Communication with Feedback

摘要

It has been firmly established in the literature that feedback offers a distinct improvement over conventional unidirectional communications systems in many cases, especially with channels subject to time varying statistics. Many of the analyses extant assume a noiseless, error-free feedback channel is available. Clearly this will not always be a valid assumption. Even in published results which include the effects of feedback errors, the possibility of interchannel correlation and its effects on performance have apparently never been considered. This paper undertakes to show that at least in some cases, some of the system performance measures exhibit a significant sensitivity to interchannel correlation of fading.