Abstract: Circuit for computing values of the elements of a triangular matrix, where ##EQU1## similar subcircuits provide CORDIC processing and memory, the subcircuits connected in a folded systolic array, the first subcircuit providing input capability to the array for receiving complex data containing N words, and the output of the last subcircuit coupled to its own input. The circuit may be used to process observation vector data taken from an antenna system of N elements to provide an output useful in determining weights for nulling out the observation data from a larger signal.

Abstract: In-phase and quadrature components of a waveform are generated by sampling the waveform at a rate of four times the center frequency of the frequency band for which components are generated. The samples are digitized and applied to a digital 90.degree. all-pass phase-splitting network. Each pair of output samples is generated as a function of input samples delayed by an even number of time instants through a first all-pass branch and delayed by an odd number of time instants through a second all-pass branch. A common network may form both branches by switching coefficients of a multiplier and alternating the output between in-phase and quadrature samples. The waveform may be shifted from a higher freqeuncy by a mixer and may be filtered prior to sampling.