Transmission Capacity of Spectrum Sharing Ad Hoc Networks with Multiple Antennas

Two coexisting ad hoc networks, primary and secondary, are considered, where each node of the primary network has a single antenna, while each node of the secondary network is equipped with multiple antennas. Using multiple antennas, each secondary transmitter uses some of its spatial transmit degre...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2011-07, Vol.10 (7), p.2334-2340
Main Author: Vaze, R.
Format: Article
Language:English
Subjects:
ad hoc network
Ad hoc networks
Antennas
Applied sciences
Business and industry local networks
cognitive radio
Degrees of freedom
Detection, estimation, filtering, equalization, prediction
Exact sciences and technology
Information, signal and communications theory
Interference
interference cancelation
Mathematical analysis
multiple antennas
Networks
Networks and services in france and abroad
Nulling
Radiocommunications
Receivers
Receiving antennas
Signal and communications theory
Signal, noise
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Transmission and modulation (techniques and equipments)
Transmission capacity
Transmitters
Transmitting antennas
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Summary:Two coexisting ad hoc networks, primary and secondary, are considered, where each node of the primary network has a single antenna, while each node of the secondary network is equipped with multiple antennas. Using multiple antennas, each secondary transmitter uses some of its spatial transmit degrees of freedom (STDOF) to null its interference towards the primary receivers, while each secondary receiver employs interference cancelation using some of its spatial receive degrees of freedom (SRDOF). This paper derives the optimal STDOF for nulling and SRDOF for interference cancelation that maximize the scaling of the transmission capacity of the secondary network with respect to the number of antennas, when the secondary network operates under an outage constraint at the primary receivers. With a single receive antenna, using a fraction of the total STDOF for nulling at each secondary transmitter maximizes the transmission capacity. With multiple transmit and receive antennas and fixing all but one STDOF for nulling, using a fraction of the total SRDOF to cancel the nearest interferers maximizes the transmission capacity of the secondary network.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2011.050511.101639