On Degrees of Freedom of the Cognitive MIMO Two-Interfering Multiple-Access Channels

This paper characterizes the exact spatial Degrees of Freedom (DoF) region of the two-user multiple-input-multiple-output two-interfering multiple-access channels (2-IMACs), which models the uplink transmission in cellular networks, for three scenarios. The first scenario is the 2-IMAC without cogni...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2013-06, Vol.62 (5), p.2052-2068
Main Authors: Ayoughi, S. A., Nasiri-Kenari, M., Khalaj, B. H.
Format: Article
Language:English
Subjects:
Applied sciences
Degrees of Freedom (DoF) region
Equipments and installations
Exact sciences and technology
genie-aided cognitive radio (CR)
Interference
interference alignment (IA)
MIMO
Mobile radiocommunication systems
Radio transmitters
Radiocommunications
Receivers
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Transmission and modulation (techniques and equipments)
Transmitters. Receivers
Transmitting antennas
uplink channel
Valuation and optimization of characteristics. Simulation
Vectors
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Summary:This paper characterizes the exact spatial Degrees of Freedom (DoF) region of the two-user multiple-input-multiple-output two-interfering multiple-access channels (2-IMACs), which models the uplink transmission in cellular networks, for three scenarios. The first scenario is the 2-IMAC without cognition, for which the achievability is generalized for more than two transmitters in each multiple-access channel. The two-user 2-IMACs' DoF regions are also derived for two different genie-aided cognition scenarios. Here, zero forcing by transmitters and interference alignment are studied in a network with more than two transmitters, whereas previous works dealt with two-transmitter networks. We also perform a comparative analysis on the DoF of the three scenarios.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2012.2237529