On the optimal relay design for multi-antenna cognitive two-way AF relay networks

Author

Girnyk, Maksym A. ; Vehkapera, Mikko ; Vorobyov, Sergiy A.

Author_Institution

Sch. of Electr. Eng., KTH R. Inst. of Technol., Stockholm, Sweden

fYear

2014

Firstpage

1579

Lastpage

1583

Abstract

Cognitive relaying is an efficient method for tackling the problem of spectrum scarcity by serving new (secondary) users, while keeping the existing (primary) users satisfied with their service. Moreover, additional gains can be attained from employment of the two-way relaying with multiple-antenna relays within the secondary network. In this paper, we consider an underlay two-way cognitive network and propose an efficient algorithm for computing a (nearly) optimal relay precoder matrix subject to the interference constraint towards the primary network. The efficiency of the proposed solution is highlighted by means of numerical simulations.

Keywords

amplify and forward communication; antenna arrays; cognitive radio; matrix algebra; precoding; radiofrequency interference; relay networks (telecommunication); amplify and forward strategy; interference constraint; multiantenna cognitive two-way AF relay network; optimal relay precoder matrix; secondary network; spectrum scarcity; Array signal processing; Cognitive radio; Interference; Optimization; Relays; Resource management;

fLanguage

English

Publisher

ieee

Conference_Titel

Signals, Systems and Computers, 2014 48th Asilomar Conference on

Print_ISBN

978-1-4799-8295-0

Type

conf

DOI

10.1109/ACSSC.2014.7094731

Filename

7094731