  Of the wide palette of 5G features, ultra-wide bandwidth and large-scale
antenna configuration are regarded as the essential enabling technology
components at millimeter wave (mmWave) communication. Accurate knowledge of
delay and angle information of multipath components is essential for many
applications in mmWave systems. There is a strong need for a low
computation-cost channel estimation algorithm for such systems, where typically
adopted far-field and narrowband assumptions might be violated. In this work, a
generic yet novel beamspace uniform circular array (UCA) beamforming algorithm
with successive cancellation scheme is proposed to jointly detect the impinging
angle and delay of the multipath components. The proposed algorithm is
computationally cheap and it works for ultra-wideband (UWB) systems in the
near-field conditions. Both numerical simulations and experimental validation
results are provided to demonstrate the effectiveness and robustness of the
proposed algorithm, compared to the state-of-art works.
