Using a model of scattering in a low-intersymbol-interference channel for array beamforming

We propose a new model of scattering for use in evaluating the degradation of a signal impinging on a base station's antenna after passing through a Nakagami-Rice fading channel. We have proposed a scheme to reduce degradation of the signal by selecting the direction-of-arrival (DOA) of the signal for use in forming the antenna beam. In this scheme, the degradation is considered to be caused by the delay spread of scattered waves arriving from the vicinity of the nominal DOA. However, the degradation observed in a low-ISI environment cannot be explained by this consideration. To explain degradation in a low-ISI environment, we propose a new model of scattering in which we consider signal degradation to be caused by Nakagami-Rice fading. We then apply the method to determine the DOA that provides the best quality for the signal. Some numerical results are given to verify that the proposed method is effective.