Figure 6From: A robust beamformer design for underlay cognitive radio networks using worst case optimizationTransmit power variation at a secondary TX. The transmit power variation at a secondary TX with respect to the radius of the uncertainty balls (ξ). A network with parameters n t = 4,N = 2 and K = 2 is considered. Transmit power is averaged over 1,000 estimated channel realizations.Back to article page