Beamforming with semi-coprime arrays

Beamforming Adaptive Arrays with Graphics Processing Units

Beamforming is a signal processing technique by which an array of receivers sensitive to signals from all directions can be processed to form one larger more sensitive receiver that can identify which direction signals originate. Conventional beamforming methods can allow signals from noisy interferers to mask signals of interest if these interferers lie close to those directions to which the b...

Towards Superdirective Beamforming with Loudspeaker Arrays

ABSTRACT In this paper, the superdirective beamforming principle as applied to loudspeaker arrays is investigated. Novel superdirectional beamformer designs (e.g. by Parra, [1]) offer significant spatial selectivity at low frequencies and allow for a small array aperture and some variability in loudspeaker positioning. The theoretical gains of superdirectional beamforming are generally difficul...

A search-free DOA estimation algorithm for coprime arrays

In this paper, we propose a fast search-free method for direction-of-arrival (DOA) estimation with coprime arrays. A coprime array consists of two uniform linear subarrays with inter-element spacings Mλ/2 and Nλ/2, where M and N are coprime integers and λ is the wavelength of the signal. Because uniform linear arrays enjoy many processing advantages over arbitrary geometry arrays, our strategy ...

Experimental Calibration for Electronic Beamforming with Sensor Arrays

Beamforming and Interference Canceling With Very Large Wideband Arrays

Future radio telescopes are envisioned to be beamforming arrays containing hundreds to millions of elements distributed over thousands of km2, with bandwidths that are 10% or more of the RF center frequency. It is awkward to analyze such systems using traditional narrowband beamforming theory. This paper presents a frequency-domain model that includes relevant features such as true time delay, ...