Smart antenna directional pattern synthesis algorithm for RFID reader based on improved particle swarm

Abstract

The invention belongs to the technical field of radio-frequency communication, and relates to a smart antenna directional pattern synthesis algorithm for an RFID reader based on an improved particle swarm. The method comprises the following steps of: analyzing the relationship between a radiation directional pattern and the excitation amplitudes, constructing an optimized objective function of a smart antenna, taking the excitation current amplitudes of array elements as optimization parameters, setting up an optimization particle model by adopting the traditional particle swarm algorithm, and improving the local searching capability and the global searching capability of the optimization particle model by introducing a simulated annealing algorithm, so that the excitation amplitudes of various array elements are determined. By means of the method, the proper array element excitation amplitude can be selected; the radiation directional pattern can be optimized; the null characteristic can be realized; the anti-interference capability of an antenna array in a UHF RFID system can be effectively improved; and the smart antenna directional pattern synthesis algorithm disclosed by the invention has a great practical significance for improving the performance of the RFID system.

Description

technical field [0001] The invention belongs to the technical field of radio frequency communication, and in particular relates to an improved particle swarm-based comprehensive algorithm for the pattern of an RFID reader's smart antenna. Background technique [0002] Radio Frequency Identification (RFID) is a wireless communication technology that realizes data interaction through electromagnetic signals. In recent years, RFID systems have been widely used in various fields such as industrial production, intelligent transportation, and asset management due to their advantages of non-contact, non-line-of-sight, high precision, and low cost. As the key factor to realize wireless data communication in the RFID system, the antenna acts as a bridge between the reader and the tag. Common RFID readers use a single antenna to radiate electromagnetic waves, which has a wide radiation range, a fixed radiation pattern, and low gain, resulting in weak anti-interference ability of the ...

AI Technical Summary

Problems solved by technology

As the communication environment becomes more and more complex, the classic pattern synthesis techniques such as Dolf-Chebyshev synthesis technology and Taylor synthesis technology can no longer meet the needs of communication. For some pattern synthesis problems with constraints, such as Therefore, it is difficult to apply in the pattern synthesis of smart antennas, and it is not suitable for the beamforming of RFID readers.

Images