Js. Goldstein et Is. Reed, PERFORMANCE-MEASURES FOR OPTIMAL CONSTRAINED BEAMFORMERS, IEEE transactions on antennas and propagation, 45(1), 1997, pp. 11-14
In this paper, the closed-form expression is derived which relates the
output signal-to-interference plus noise ratio to the minimum mean-sq
uare error of constrained beamformers for narrowband and wideband sign
al environments.