DESIGN OF THINNED SMART ANTENNA OF SEMI-CIRCULAR DIPOLE ARRAY FOR 5G MASSIVE MIMO SYSTEM

Anindita Khan, Jibendu Sekhar Roy

DOI Number
https://doi.org/10.2298/FUEE2403409K
First page
409
Last page
422

Abstract


In a multi-user environment, wireless networks should be massive MIMO (MMIMO) systems consisting of multiple antennas. MMIMO installs antenna arrays at base stations and uses hundreds of transceivers and other RF modules to form a very narrow and focused beam, thus reducing interference. The disadvantage of MMIMO systems is large power consumption, and the RF module beamforming network for multiple antennas is significant in terms of power consumption. This paper presents a new low power beamforming technique for MMIMO systems. The proposed semicircular array thinned smart antenna (TSA) can form a secure beam for user terminals while reducing interference. In a thinned array, selected antennas are kept off, which reduces power consumption but the array pattern remains the same as the built-in array, and the sidelobe level (SLL) is reduced. The thinned array antennas are designed at 5 GHz of the sub-6GHz band. The differential evolution (DE) algorithm is utilized to determine the optimal array sequence and least mean square (LMS), recursive least square (RLS), and sample matrix inversion (SMI) algorithms are used for beam generation of the TSA and the algorithms are DE-LMS, DE-RLS and DE-SMI. A maximum of 48% energy savings is achieved. Using the DE-LMS, DE-RLS and DE-SMI algorithms, TSA achieved maximum SLL reduction of 11 dB, 11 dB and 9 dB, respectively.

Keywords

Smart antenna, thinning, beamforming, signal processing, differential evolution, power saving

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References


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