MVDR beamforming with inverse updating

A stable alternative is described for the ‘standard’ systolic MVDR beamforming algorithm of McWhirter and Shepherd [4], which is known to suffer from linear round-off error build-up. The algorithm combines a so-called inverse QR-updating algorithm, with (part of) the McWhirter and Shepherd procedure. Similar to the McWhirter and Shepherd algorithm, it is amenable to parallel (pipelined) implementation. Unlike the McWhirter and Shepherd algorithm, it is stable numerically, and hence does not need repeated reinitializations.