Abstract
Spectrum sensing and direction of arrival (DOA) estimation have both been thoroughly investigated. Estimating spectrum and DOA is important for many signal processing applications, such as cognitive radio (CR). A challenging scenario, faced by CRs, is that of multiband signals, composed of several narrowband transmissions spread over a wide spectrum and each with an unknown carrier frequency and DOA. The Nyquist rate of such signals is high. To overcome the sampling rate issue, several sub-Nyquist sampling methods, such as multicoset or the modulated wideband converter (MWC), have been proposed. In this paper, we use an ULA-based MWC structure to implement joint carrier frequency and DOA estimation at sub-Nyquist sampling rate. Different from other methods, we reduce the complexity of the hardware with fewer antennas and solve the pairing issues compared to other estimation methods.
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