Spatial IDFT for Squint-Free Massive Arrays
Abstract
This paper presents a novel technique to build squint-free massive phased arrays. This is accomplished by explicitly implementing a spatial IDFT to cancel out the DFT imposed by the array nature which causes beam squint. In addition, the paper analyzes the beam-squint issue, which arises from two mechanisms: the coherent bandwidth limitations and the systematic delay spread in the array. These mechanisms reduce the signal-to-noise ratio and cause inter-symbol interference. This work also highlights the importance of utilizing OFDM modulation to enhance signal quality by mitigating the self-interference issue. A numerical solver is used to simulate and verify the IDFT squint-free implementation and to estimate the signal quality limitations in massive arrays.
Cite
@article{arxiv.2305.19559,
title = {Spatial IDFT for Squint-Free Massive Arrays},
author = {Hesham Beshary and Ali Niknejad},
journal= {arXiv preprint arXiv:2305.19559},
year = {2026}
}
Comments
A revision of this work is accepted for publication in IEEE Transactions on Circuits and Systems I: Regular Papers. Copyright transferred to IEEE