Paper Info
Title
Spatial Sensing and Cognitive Radio Communication in the Presence of a -User Interference Primary Network
Abstract
We study the feasibility of cognitive radio (CR) communication in the presence of a -user multi-input multi-output (MIMO) interference channel as the primary network. Assuming that the primary interference network has unused spatial degrees of freedom (DoFs) , we first investigate the sufficient condition on the number of antennas at the secondary transmitter under which the secondary system can communicate while causing no interference to the primary receivers. We show that, to maximize the benefit, the secondary transmitter should have at least the same number of antennas as the spatial DoFs of the primary system. We then derive the secondary precoding and decoding matrices to have zero interference leakage into the primary network while the signal-to-interference plus noise ratio (SINR) at the secondary receiver is maximized. As the success of the secondary communication depends on the availability of unused DoFs, we then propose a fast sensing method based on the eigenvalue analysis of the received signal covariance matrix to determine the availability of unused DoFs or equivalently spatial holes. Since the proposed fast sensing method cannot identify the indices of inactive primary streams, we also provide a fine sensing method based on the generalized likelihood ratio test (GLRT) to decide the absence of individual primary streams. Simulation results show that the proposed CR sensing and transmission scheme can, in practice, provide a significant throughput while causing no interference to the primary receivers, and that the sensing detects the spatial holes of the primary network with high detection probability.
Year
DOI
Venue
2014
10.1109/JSAC.2014.2361073
Selected Areas in Communications, IEEE Journal  
Keywords
Field
DocType
$K$-user MIMO interference channel,Cognitive radio,GLRT detector,K-user MIMO interference channel,eigenvalue-based sensing,interference alignment,null space sensing,null space sensing,spatial holes
Transmitter,Computer science,Signal-to-noise ratio,MIMO,Real-time computing,Signal-to-interference-plus-noise ratio,Interference (wave propagation),Throughput,Precoding,Cognitive radio
Journal
Volume
Issue
ISSN
33
5
0733-8716
Citations 
PageRank 
References 
3
0.39
28
Authors
4
Name
Order
Citations
PageRank
Ardalan Alizadeh1836.00
Hamid-Reza Bahrami2748.75
Mehdi Maleki31148.32
Shivakumar Sastry47913.63