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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 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.

preprint2010arXivOpen access
Rahul Vaze
math.ITInformation Theory
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Rahul Vaze

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