A ray antenna array, built from fixed-beam subarrays with no phase shifters, can match or beat hybrid beamforming in simulated links while using far cheaper hardware.
Millimeter wave MIMO with lens antenna array: A new path division multiplexing paradigm,
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Ray Antenna Array: A Novel Cost-Effective Multi-Antenna Architecture for Enhanced Wireless Communication
A ray antenna array, built from fixed-beam subarrays with no phase shifters, can match or beat hybrid beamforming in simulated links while using far cheaper hardware.