Patent ID: 7248897

Claim:
A method for optimizing a radiation pattern of a smart antenna including a linear array of antenna elements, comprising the steps of: determining directions of a desired signal and interfering signals; adjusting amplitude weights and phase shift weights of the antenna elements by a cost function until the cost function in the direction of the desired signal is maximized and the cost function in the direction of each interfering signal is minimized; and obtaining the optimized radiation pattern by the cost function with the adjusted amplitude weights and phase shift weights; wherein the cost function is represented by AF m (θ): A ⁢ ⁢ F m ⁡ ( θ ) = 2 * 1 M ⁢ ∑ n = 1 N ⁢ α m ⁢ ⁢ n ⁢ cos ⁡ [ ( n - 0.5 ) ⁢ ψ + β m ⁢ ⁢ n ] , m = 1 , 2 , 3 , ⁢ … ⁢ , M where M is the number of users; AF m (θ) is the cost function of the linear array for a receiver m; 2N is the number of antenna elements; n=1,2,3, . . . , N; α mn is the amplitude weight of antenna element n for the receiver m; β mn is the phase shift weight of antenna element n for the receiver m; θ is an angle between an incident signal and an array normal; and Ψ=kd sin θ, k is a Boltzmann constant, d is a distance of two adjacent antenna elements.