Limited area communication using sum & differential patterns

In this paper, a novel communication system for limited area communication is proposed. In the proposed system, sum pattern and differential pattern is used. A main beam of the sum pattern is directed to the direction of the desired user and signal for communication is transmitted using the main beam. On the other hand, a null of the differential pattern is also directed to the desired user and a jamming signal is transmitted using the differential pattern. Numerical results show that the communication area is limited by interference due to the jamming signal while the communication distance is not affected.