On the Degrees of Freedom of K-User SISO Interference and X Channels With Delayed CSIT

Author

Abdoli, Mohammad Javad ; Ghasemi, Abdorasoul ; Khandani, Amir K.

Author_Institution

Huawei Technol. Canada Co., Ltd., Kanata, ON, Canada

Volume

59

Issue

10

fYear

2013

fDate

Oct. 2013

Firstpage

6542

Lastpage

6561

Abstract

The K-user single-input single-output (SISO) additive white Gaussian noise (AWGN) interference channel and 2×K SISO AWGN X channel are considered, where the transmitters have delayed channel state information (CSI) through noiseless feedback links. Multiphase transmission schemes are proposed for both channels which possess novel ingredients, namely, multiphase partial interference nulling, distributed interference management via user scheduling, and distributed higher order symbol generation. The achieved degree-of-freedom (DoF) values are greater than the best previously known DoFs for both channels with delayed CSI at the transmitters.

Keywords

AWGN channels; interference suppression; radio links; radio transmitters; radiofrequency interference; AWGN interference channel; CSI; DoF value; K-user SISO interference; K-user single-input single-output additive white Gaussian noise channel; X channel; channel state information; degree-of-freedom value; delayed CSIT; distributed higher order symbol generation; distributed interference management; multiphase partial interference nulling; multiphase transmission scheme; noiseless feedback link; transmitter; user scheduling; Fading; Integrated circuits; Interference; MIMO; Receivers; Redundancy; Transmitters; Degrees of freedom (DoF); X channel; delayed CSIT; interference channel (IC); retrospective interference alignment (IA);

fLanguage

English

Journal_Title

Information Theory, IEEE Transactions on

Publisher

ieee

ISSN

0018-9448

Type

jour

DOI

10.1109/TIT.2013.2268154

Filename

6530617