Wideband fading channel capacity with training and partial feedback

Manish Agarwal, Michael L. Honig

Research output: Chapter in Book/Report/Conference proceedingConference contribution

16 Scopus citations

Abstract

We consider the capacity of a wideband fading channel with partial feedback, subject to an average power constraint. A doubly block Rayleigh fading model is assumed with finite coherence time (M channel uses) and a large number of independent, finite coherence bands. Without feedback, it is known that uniformly spreading the signal power beyond a critical number of coherence bands decreases the capacity. Here we assume that a pilot sequence is transmitted during each coherence time for channel estimation, and that feedback is used to designate a subset of coherence bands on which to transmit. Our problem is to optimize jointly the training length, average training power, and spreading bandwidth, taking into account the channel estimation error. We do this by maximizing a lower bound on the ergodic capacity. This lower bound becomes tight for large M, and we show that it increases as O(logM). The capacity of the partial feedback scheme therefore exceeds the capacity of "flash" signaling when M exceeds a (positive) threshold value.

Original languageEnglish (US)
Title of host publication43rd Annual Allerton Conference on Communication, Control and Computing 2005
PublisherUniversity of Illinois at Urbana-Champaign, Coordinated Science Laboratory and Department of Computer and Electrical Engineering
Pages65-74
Number of pages10
ISBN (Electronic)9781604234916
StatePublished - Jan 1 2005
Event43rd Annual Allerton Conference on Communication, Control and Computing 2005 - Monticello, United States
Duration: Sep 28 2005Sep 30 2005

Publication series

Name43rd Annual Allerton Conference on Communication, Control and Computing 2005
Volume1

Other

Other43rd Annual Allerton Conference on Communication, Control and Computing 2005
CountryUnited States
CityMonticello
Period9/28/059/30/05

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications

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    Agarwal, M., & Honig, M. L. (2005). Wideband fading channel capacity with training and partial feedback. In 43rd Annual Allerton Conference on Communication, Control and Computing 2005 (pp. 65-74). (43rd Annual Allerton Conference on Communication, Control and Computing 2005; Vol. 1). University of Illinois at Urbana-Champaign, Coordinated Science Laboratory and Department of Computer and Electrical Engineering.