Abstract
Antenna arrays are able to improve the directivity performance and reduce the cost of wireless communication systems. However, how to reduce the maximum sidelobe level (SLL) of the beam pattern is a key problem in antenna arrays. In this paper, three kinds of antenna arrays that are linear antenna array (LAA), circular antenna array (CAA) and random antenna array (RAA) are investigated. First, we formulate the SLL suppression optimization problems of LAA, CAA and RAA, respectively. Then, we propose a novel method called improved chicken swarm optimization (ICSO) approach to solve the formulated optimization problems. ICSO introduces four enhanced strategies including the local search factor, weighting factor and global search factor into the update method of conventional chicken swarm optimization (CSO) algorithm, respectively, for achieving better beam pattern optimization results of antenna arrays. Moreover, a variation mechanism is proposed to enhance the population diversity so that further improving the performance of the algorithm. We conduct simulations to evaluate the performance of the proposed ICSO for the maximum SLL suppressions of LAAs, CAAs and RAAs, and the results show that ICSO obtains lower maximum SLLs for different antenna array cases with different numbers of antenna elements compared to several other algorithms.
Highlights
Antenna arrays are important technologies for modern wireless communication systems because they can provide high gains and spectral efficiency [1], [2]
To overcome the drawbacks of conventional CSO algorithm above, we propose a novel swarm intelligence approach called improved chicken swarm optimization (ICSO) algorithm to solve the formulated sidelobe suppression optimization problems
ICSO and other comparison algorithms are used for solving the formulated sidelobe level (SLL) reduction optimization problems and results are presented
Summary
Antenna arrays are important technologies for modern wireless communication systems because they can provide high gains and spectral efficiency [1], [2]. That with high spectral efficiency are proposed to enhance the capacity of the system [7], [8] Both of these two technologies are based on antenna arrays. There are many different shapes of antenna arrays used in practical systems, and the linear antenna array (LAA) and circular antenna array (CAA) can be regarded as the most commonly used ones [9]. Both of LAA and CAA are able to perform the beams with high gains to the desired receivers, which can enhance the communication performance and suppress the interferences. The feed network of CAA is more complex than that of LAA
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
