QR VERSUS IQR ALGORITHMS FOR ADAPTIVE SIGNAL-PROCESSING - PERFORMANCEEVALUATION FOR RADAR APPLICATIONS

The authors present a novel systolic array for minimum variance distor tionless response (MVDR) adaptive beamforming, based on inverse QR (IQ R) updates. The array is made up of O(N-2 + mN) processing cells, N be ing the number of degrees of freedom and m the number of look directio ns, and allows a fully parallel and pipelined weight extraction. In th is respect the proposed array overcomes the limitations of existing sy stolic adaptive beamformers which require O(mN(2)) cells and/or do not allow parallel pipelined weight extraction. In addition, the paper co nsiders CORDIC realisation of systolic adaptive beamformers. Finally, it provides a comparative study, via simulation experiments, on the nu merical properties of various systolic adaptive beamformers when imple mented with CORDIC cells and operating on typical radar data.