Direction finding and multipath mitigation using single antenna

In this paper, we address the important problem of direction of arrival (DOA) estimation using a single directional antenna under the multipath environment. We address this practically important problem by following a three step approach; i) Restoration, ii) Separation and iii) Estimation. By assuming constant modulus signal similar to earlier works, we employ the constant modulus algorithm (CMA) to restore the constant modularity which gets destroyed due to multipath, in the restoration step. In the subsequent separation step, using the restored signal as the reference, we separate the power profile corresponding to each of the direct and reflected paths. Further, to estimate DOA from these separated power profiles, a compressed sensing based algorithm is also proposed. Both the simulation and experimental results show significantly better multipath mitigation with the proposed approach than those by the existing approaches.