Graduate School and Research Center in Digital Sciences

Achieving the DoF limits of the SISO X channel with imperfect-quality CSIT

Zhang, Jingling; Elia, Petros; Slock, Dirk TM

ISIT 2015, IEEE International Symposium on Information Theory, June 14-19, 2015, Hong Kong, Hong-Kong

In the setting of the two-user single-input singleoutput X channel, recent works have explored the degrees-offreedom (DoF) limits in the presence of perfect channel state information at the transmitter (CSIT), as well as in the presence of perfect-quality delayed CSIT. Our work shows that the same DoF-optimal performance -- previously associated to perfectquality current CSIT -- can in fact be achieved with current CSIT that is of imperfect quality. The work also shows that  the DoF performance previously associated to perfect-quality delayed CSIT, can in fact be achieved in the presence of imperfect-quality delayed CSIT. These follow from the presented sum-DoF lower bound that bridges the gap -- as a function of the quality of delayed CSIT -- between the cases of having no feedback and having delayed feedback, and then another bound that bridges the DoF gap -- as a function of the quality of current CSIT -- between delayed and perfect current CSIT. The bounds are based on novel precoding schemes that are presented here and which employ imperfect-quality current and/or delayed feedback to align interference in space and in time.

Document Doi Bibtex

Title:Achieving the DoF limits of the SISO X channel with imperfect-quality CSIT
Keywords:Degrees of freedom, SISO X channel, CSIT
City:Hong Kong
Department:Communication systems
Eurecom ref:4588
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Bibtex: @inproceedings{EURECOM+4588, doi = {}, year = {2015}, title = {{A}chieving the {D}o{F} limits of the {SISO} {X} channel with imperfect-quality {CSIT}}, author = {{Z}hang, {J}ingling and {E}lia, {P}etros and {S}lock, {D}irk {TM}}, booktitle = {{ISIT} 2015, {IEEE} {I}nternational {S}ymposium on {I}nformation {T}heory, {J}une 14-19, 2015, {H}ong {K}ong, {H}ong-{K}ong}, address = {{H}ong {K}ong, {HONG} {KONG}}, month = {06}, url = {} }
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