Graduate School and Research Center in Digital Sciences

The capacity to within a constant gap of the Gaussian half-duplex relay channel

Cardone, Martina; Tuninetti, Daniela; Knopp, Raymond; Salim, Umer

ISIT 2013, IEEE International Symposium on Information Theory, 7-12 July 2013, Istanbul, Turkey

This paper studies the Gaussian half duplex relay channel, where the relay node can not transmit and receive at the same time. The main contribution lies in showing that both Partial-Decode-Forward and Compress-Forward achieve the Cut-Set upper bound to within a constant gap regardless of the channel parameters. This provides a closed form characterization of the Generalized Degrees-of-Freedom (gDoF) of the channel, which for certain channel parameters is strictly smaller than the gDoF of the full duplex channel. Half duplex channels can convey information through the random switch between the receive and retransmit phases; this work shows numerically that random switch achieves larger rates compared to deterministic switch, which is usually considered in the literature.

Document Doi Hal Bibtex

Title:The capacity to within a constant gap of the Gaussian half-duplex relay channel
Department:Communication systems
Eurecom ref:4013
Copyright: © 2013 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Bibtex: @inproceedings{EURECOM+4013, doi = {}, year = {2013}, title = {{T}he capacity to within a constant gap of the {G}aussian half-duplex relay channel}, author = {{C}ardone, {M}artina and {T}uninetti, {D}aniela and {K}nopp, {R}aymond and {S}alim, {U}mer}, booktitle = {{ISIT} 2013, {IEEE} {I}nternational {S}ymposium on {I}nformation {T}heory, 7-12 {J}uly 2013, {I}stanbul, {T}urkey }, address = {{I}stanbul, {TURKEY}}, month = {07}, url = {} }
See also: