MINIMUM REDUNDANCY ARRAY STRUCTURE FOR INTERFERENCE CANCELLATION

A special thinned array structure, termed Minimum Redundancy Array (MR A), is proposed and investigated for interference cancellation. This a rray structure has been proved in the past to have advantages in direc tion finding application. Exclusive attention is given to the Minimum Noise Variance (MNV) performance of MRAs operating in a multiple narro w-band interference environment which is the most suitable for applica tions wherein the desired signal can be assumed absent during weight a daptation, as for example in radar. Particular attention is focused on the single and two-interference cases. The closed-form equation for t he optimal signal-to-interference plus noise ratio is obtained for bot h array structures as a function of the number of array elements, the direction of the interferences and their power to noise ratio. Perform ance comparison is done numerically. A recursive formula for the inver se of the correlation matrix is found and used to evaluate the perform ance of the arrays operating under more than two interferences. It is also shown that MRA almost always outperform URA when they are used as interference cancellers. Simulation results supplement this conclusio n.