DOA estimation of coherent and incoherent wideband OFDM signals based on fourth-order cumulants

Abstract

A novel algorithm based on fourth-order cumulants (FOC) was proposed when coherent and incoherent wideband OFDM signals coexist. The proposed algorithmcomprises two steps. The first step is to estimate the DOA of incoherent OFDM signals, then a FOC matrix that only contains the information of coherentOFDMsignalswas constructed by eliminating the contribution of incoherent OFDMsignals; the second step is to estimate the DOA of the coherent OFDMsignals from the constructed matrix by using a sparse reconstruction method. The simulation results demonstrate the performance of our proposed algorithm.