Cooperative Relaying for the Rank-Deficient MIMO Relay Interference Channel

Author

Chae, Sung Ho ; Jeon, Sang-Woon ; Chung, Sae-Young

Author_Institution

Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea

Volume

16

Issue

1

fYear

2012

fDate

1/1/2012 12:00:00 AM

Firstpage

9

Lastpage

11

Abstract

Rank-deficient multiple-input multiple-output (MIMO) relay interference channel (IC) is investigated in which K source-destination pairs communicate with the help of N relays. For the K-user rank-deficient MIMO IC with no relays, an achievable sum degrees of freedom (DoF) is upper bounded by Kr_ds, where r_ds denotes the rank of each point-to-point channel matrix. However, if relays assist the communication, we show that there can be significant improvement on the DoF compared to the case where there is no relay. The proposed cooperative relaying uses relays not only for increasing ranks of desired channel matrices but also nullifying inter-user interference.

Keywords

MIMO communication; cooperative communication; interference suppression; matrix algebra; radiofrequency interference; wireless channels; DoF improvement; cooperative relaying; degree-of-freedom; interuser interference nullificatiopn; multiple-input multiple-output relay IC; point-to-point channel matrix; rank-deficient MIMO relay interference channel; source-destination pairs; Antennas; Integrated circuits; MIMO; Relays; Scattering; Vectors; Wireless communication; Cooperative communication; degrees of freedom; rank-deficient channel; relay interference channel;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2011.111011.111514

Filename

6093681