  Employing large antenna arrays and utilizing large bandwidth have the
potential of bringing very high data rates to future wireless communication
systems. However, this brings the system into the near-field regime and also
makes the conventional transceiver architectures suffer from the wideband
effects. To address these problems, in this paper, we propose a low-complexity
frequency-aware beamforming solution that is designed for hybrid time-delay and
phase-shifter based RF architectures. To reduce the complexity, the joint
design problem of the time delays and phase shifts is decomposed into two
subproblems, where a signal model inspired online learning framework is
proposed to learn the shifts of the quantized analog phase shifters, and a
low-complexity geometry-assisted method is leveraged to configure the delay
settings of the time-delay units. Simulation results highlight the efficacy of
the proposed solution in achieving robust performance across a wide frequency
range for large antenna array systems.
