Optimum Array Processing for Detecting Binary Signals Corrupted by Directional Interference

摘要

This report examines optimum array processing for bit detection of a binary communication signal in the presence of a directional interfering signal. The binary communication signal is assumed to be either completely known or to have random parameters (Rayleigh amplitude and uniform phase). The interfering signal is a wide-sense stationary Gaussian process. The receiving antenna is a linear array of equally spaced isotropic point elements. Statistically independent white noise is added to the signal at each element. An analytical expression for the inverse of the covariance matrix is obtained, and the general structure for the optimum detector is derived. The optimum processor is a correlation receiver whose detailed structure is dependent in general on the power spectrum of the interference, as well as the other antenna and signal parameters. The detection error is calculated for several cases. It is found that the detection error is minimized if the array elements have an optimum spacing, determined by the array size and the incidence angles of the desired signal and the interference. When the optimum is used, the structure of the detection system is not dependent on the power spectrum of the interfering signal. (Author)