An efficient searching algorithm for high DoF non-uniform linear antenna array with constrained spacing

This work proposes a systematic algorithm to build up a spacing-constrained non-uniform linear array (NLA) configuration. Obtainable DoF due to the proposed algorithm can have much better performance than existing NLA configurations. By further applying spatial smoothing and array interpolation techniques, performance indices, such as number of incident signal (NIS) detection and direction of arrival (DoA) estimation, of an antenna array are also demonstrated to be significantly enhanced. In addition, simulation results also illustrate that beamforming techniques based on the proposed NLA configurations can provide much better signal-to-interference-plus-noise ratio (SINR) to a wireless communication system than existing NLA approaches.