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A robust beamformer design for underlay cognitive radio networks using worst case optimization

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Figure

Figure 1 System model. Underlay cognitive radio network with twosecondary TX-RX pairs (N = 2) coexists with a primary networkconsisting a single primary RX (K = 1)
Figure 2 CDF of the interference due to the secondary networkat a primary RX. Empirical CDF of the interference due to thesecondary network at first primary RX for different values of ξ
Figure 6 Transmit power variation at a secondary TX. Thetransmit power variation at a secondary TX with respect to the radiusof the uncertainty balls (ξ)
Figure 7 Network model for gain pattern comparison.network. Secondary receiver at direction Sample θ = 45◦ and primaryreceivers at directions θ = 60°, θ = 90° and θ = 120°

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