Low-Complexity Multi-beamforming with Configurable Beam Profiles via Approximate-DSFT
Conference
Nanthakumar, P, Wijenayake, C, Edussooriya, CUS et al. (2026). Low-Complexity Multi-beamforming with Configurable Beam Profiles via Approximate-DSFT
. Proceedings - IEEE International Symposium on Circuits and Systems, 185-189. 10.1109/ISCAS66217.2026.11562343
Nanthakumar, P, Wijenayake, C, Edussooriya, CUS et al. (2026). Low-Complexity Multi-beamforming with Configurable Beam Profiles via Approximate-DSFT
. Proceedings - IEEE International Symposium on Circuits and Systems, 185-189. 10.1109/ISCAS66217.2026.11562343
Low-complexity digital multi-beamforming via multiplier-less approximations for discrete spatial Fourier transform (DSFT) is explored. The proposed approach employs an approximate-DSFT (ADSFT) which - for a uniform linear array with N antennas producing N simultaneous beams, reduces the hardware multiplier requirement from 3N2 to 0 with marginal error in the beam profiles. Importantly, the proposed approach extends the previously reported approximate discrete Fourier transform (ADFT) multi-beamforming systems having fixed beam profiles to enable configurable beam profiles, where the user can obtain N simultaneous beams within a given spatial angular region. Simulations demonstrate that the multi-beam profiles are largely accurate, and approximate selection results in deviations for 8- and 16-element ULAs, with worst-case beam angle errors of 0.3° and 0.2°, and worst-case sidelobe deviations of 1.7 dB and 1.4 dB, respectively. For the same scenarios, the proposed ADSFT provides 100% reduction in multiplier complexity and 44.45% reduction in adder complexity compared to conventional multi-beamforming algorithms.
