FILTER COEFFICIENT ARITHMETIC UNIT OF FIR TYPE DIGITAL FILTER FOR DIGITAL BEAM FORMING DEVICE, FIR TYPE DIGITAL FILTER FOR DIGITAL BEAM FORMING DEVICE AND DIGITAL BEAM FORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a filter coefficient arithmetic unit of an FIR-type digital filter for a digital beam forming device which can be applied to information transmission using a carrier wave being a radio wave by providing a coefficient arithmetic means calculating the filter coefficient of plural FIR-type digital filters. ;SOLUTION: DBF circuit 6 of this digital beam forming device is provided with the FIR-type digital filters 9-1 to 9-N filtering and outputting an inputted digital common-mode and orthogonal signal XK (m) based on a load coefficient calculated by an FIR-type digital filter coefficient arithmetic unit 13 and provided with an adder 10. As the DBF circuit 6 and the arithmetic unit 13 are provided, a wide-band beam is formed in the incoming direction of a desired signal being a radio wave and the desired wide-band signal corresponding to the wide-band beam is received to output a desired output signal Z (m) being a base band signal.;COPYRIGHT: (C)1997,JPO