Iterative and one-shot conferencing in relay channels

Chris T.K. Ng, Ivana Maric, Andrea J. Goldsmith, Shlomo Shamai, Roy D. Yates

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

27 Scopus citations

Abstract

We compare the rates of one-shot and iterative conferencing in a cooperative Gaussian relay channel. The relay and receiver cooperate via a conference, as introduced by Willems, in which they exchange a series of communications over orthogonal links. Under one-shot conferencing, decode-and-forward (DF) is capacity-achieving when the relay has a strong channel. On the other hand, Wyner-Ziv compress-and-forward (CF) approaches the cut-set bound when the conference link capacity is large. To contrast with one-shot conferencing, we consider a two-round iterative conference scheme; it comprises CF in the first round, and DF in the second. When the relay has a weak channel, the iterative scheme is disadvantageous. However, when the relay channel is strong, iterative cooperation, with optimal allocation of conferencing resources, outperforms one-shot cooperation provided that the conference link capacity is large. When precise allocation of conferencing resources is not possible, we consider iterative cooperation with symmetric conference links, and show that the iterative scheme still surpasses one-shot cooperation, albeit under more restricted conditions.

Original languageEnglish (US)
Title of host publication2006 IEEE Information Theory Workshop, ITW 2006
Pages193-197
Number of pages5
StatePublished - 2006
Externally publishedYes
Event2006 IEEE Information Theory Workshop, ITW 2006 - Punta del Este, Uruguay
Duration: Mar 13 2006Mar 17 2006

Publication series

Name2006 IEEE Information Theory Workshop, ITW 2006

Other

Other2006 IEEE Information Theory Workshop, ITW 2006
Country/TerritoryUruguay
CityPunta del Este
Period3/13/063/17/06

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Fingerprint

Dive into the research topics of 'Iterative and one-shot conferencing in relay channels'. Together they form a unique fingerprint.

Cite this