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Millimeter-wave (mmWave) systems require massive antennas at both transmitter and receiver to reach desirable link budget. Analog-digital hybrid beamforming is a promising architecture since it significantly reduces the hardware cost while approaches the performance of digital beamforming. However, the nonlinear power amplifier (PA) introduces intermodulation interference and degrades the spectral...
Wideband cognitive radios (CRs) receive signals from multiple transmitters simultaneously to increase spectrum utilization. Processing a wideband spectrum is challenging due to large dynamic range (DR) of the received signal and required high sampling speed of the ADC. The power consumption of high sampling speed/high-resolution ADCs have been prohibitive for handheld radios. However, in CR applications...
In this contribution we address the problem of cooperative localization of primary users in cognitive networks. We formulate this problem as a special case of Bayesian tracking, where multiple secondary users obtain direction-of-arrival (DoA) measurements from the target primary user by means of directional antennas, multi-antenna receivers, or virtual arrays. As opposed to typical settings, time-of-arrival...
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