FURTHER RESULTS IN SPATIAL SMOOTHING

The paper analyses the effect of spatial smoothing on the performance of MUSIC algorithm. In particular, an attempt is made to bring out two effects of the smoothing: (i) reduction of effective correlation betw een the impinging signals and (ii) reduction of the noise perturbation s due to finite data. For the case of a two-source scenario with widel y spaced sources, simplified expressions for improvement with smoothin g have been obtained which provide more insight into the impact of smo othing. Specifically, a pessimistic estimate of the minimum value of s ource correlation beyond which the smoothing is beneficial is brought out by these expressions. Computer simulations are used to demonstrate the usefulness of the analytical results.