Here, a wideband signal direction-of-arrival (DOA) estimation method was proposed. By applying the keystone transform, the phase difference caused by different frequency is eliminated, and then the narrowband DOA estimation method can be used directly. Compared with the traditional method, the proposed approach can achieve better estimation accuracy than incoherent subspace method and coherent subspace method at low signal-to-noise ratio. The theoretical derivation of the method is given. Monte–Carlo simulations are provided to demonstrate the performance of the proposed scheme.

In this paper, we first study the scenario where N sensors are with the same carrier frequency. Interference appears between each two sensors. An interference signal cancellation method based on multiple parameters estimation is proposed. Through the accurate estimation, the interference is reconstructed and eliminated from the received signal. Simulation is also provided to demonstrate the performance of the proposed scheme.