Interference Supression of the Linear Antenna Arrays Controlled by Phase With Use of SQP Algorithm

Abstract

Abstract-The performance of mobile cellular radio networks is limited by the level of cochannel interference that can be tolerated. The use of antennas arrays is very helpful in enhancing the performance and capacity of the wireless communication system. This paper presents a method for antenna pattern synthesis that suppress multiple interfering narrow or wide band signals while receiving the desired signal by controlling only the phase. Excitation phases are computed using the Sequential Quadratic Programming (SQP) technique. This method transforms the nonlinear minimization (or maximization) problem to a sequence of quadratic subproblems, based on a quadratic approximation of the Lagrangian function.

Co-Frequency Interference Suppression Algorithm via Maximum Signal Minus Interference Level

“…These signals come from different directions, and the space filtering techniques (beamforming) can be used to suppress interference partially [17][18][19][20]. It is assumed that the antenna is just an L-length uniform linear array with digital beamforming capability.…”

Scheduling of a Smart Antenna: Capacitated Coloring of Unit Circular-Arc Graphs

“…Calculating the required weights needed to form a given beam is a complicated task (see: [15,13,8]). One method to overcome this problem is to pre-calculate the coefficients that yields a pencil beam of width 2∆ in any given direction θ, and use superposition to obtain a combination of pencil beams.…”

Effect of Mutual Coupling and Configuration of Concentric Circular Array Antenna on the Signal-to-Interference Performance in Cdma Systems

“…A very popular type of antenna arrays is the circular array (CA) which has several advantages over other schemes such as all-azimuth scan capability (i.e., it can perform 360 • scan around its center) and the beam pattern can be kept invariant. CCAA that contains many concentric circular rings of different radii and number of elements have several advantages including the flexibility in array pattern synthesis and design both in narrowband and broadband beamforming applications [12][13][14][15][16][17][18][19]. CCAA is also favored in direction of arrival (DOA) applications since it provides almost invariant azimuth angle coverage.…”