GENERALIZED ARRAY MANIFOLD MODEL FOR WIRELESS COMMUNICATION CHANNELS WITH LOCAL SCATTERING

The authors propose the use of a generalised array manifold for parame terised spatial signature estimation in wireless communication channel s with local scattering. The array manifold commonly used for point so urces is generalised to include linear combinations the nominal array response of vectors and their derivatives. The motivation behind this idea is to obtain better estimates of the spatial signatures for direc tion of arrival (DOA) based signal waveform estimation. The estimators proposed exploit the orthogonality between the so-called noise and si gnal subspaces, leading to a separable solution for the derivative coe fficients. As a result, a search is required for the DOAs only. For un iform linear arrays, the spatial signatures are shown to be approximat ely Vandermonde vectors with damped modes, and a closed-form estimator such as ESPRIT may be used in this case. Simulation examples are incl uded to the signal compare estimation performance obtained using the p roposed generalised manifold and the conventional array manifold.