Abstract
Data rate and energy efficiency performance of mmWave wireless communication systems consisting of a new lens antenna subarray (LAS) based hybrid multiple input multiple output (MIMO) architecture is investigated. The LAS architecture degenerates into traditional hybrid MIMO architecture (TA) or single lens antenna array architecture (SLA) when the lens diameter of the subarray is reduced or enlarged, respectively. It is shown that under mmWave channel scattering conditions, LAS architecture operates with a data rate approaching that of TA while significantly exceeding the data rate of the SLA. Due to the reduced hardware complexity and power consumption, LAS architectures operate with a significantly improved energy efficiency. In an example system consisting of 64 and 16 transmitter and receiver antennas with 2 RF chains, it is shown that the LAS architecture operates with $2\times $ energy efficiency and 98% spectrum efficiency. In a larger hybrid MIMO antenna systems, LAS architecture is expected to benefit even more.
Highlights
Multimedia driven technologies and multifunctional wireless devices have pushed the existing wireless systems to their limits in traditionally utilized spectrum and increased the desire to operate at higher frequency bands [1], [2]
Due to its reduced precoding capability, the lens antenna subarray (LAS) architecture cannot reach to the spectrum efficiency performance of the traditional hybrid MIMO architecture (TA) which improves by 41% as compared to the single lens antenna array architecture (SLA)
CONCLUDING REMARKS Spectrum and energy efficiencies of mmWave wireless communication systems consisting of a new LAS based hybrid multiple input multiple output (MIMO) architecture were investigated
Summary
Multimedia driven technologies and multifunctional wireless devices have pushed the existing wireless systems to their limits in traditionally utilized spectrum and increased the desire to operate at higher frequency bands [1], [2]. Karabacak et al.: Lens Antenna Subarrays in mmWave Hybrid MIMO Systems: Data Rate and Energy Efficiency phased arrays These investigations have shown that alternative architectures consume less power (due to the removal of phase shifters), they operate with less spectrum efficiency. The LAS architecture necessitates to include a switch network per a subarray as well to perform antenna selection based on desired angular beam direction These architectural modifications allows AFp to gain its electronic beam-steering capability. This was a 1D linear array implementation of the LAS architecture It was designed with the objectives of meeting the radiation efficiency and aperture efficiency (i.e. half-power beamwidth (HPBW)) performance of a traditional N = 20 element λ/2 spaced 1D linear phased antenna array Location of these elements are designed to generate beams with equal θ spacing
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