~/4 shift qpsk modulator

Details ~/4 shift qpsk modulator ~/4 shift qpsk modulator

H - Electricity

03

C

H03C 3/00 (2006.01) H04L 27/20 (2006.01)

Patent

CA 2120552

Abstract A .pi./4 shift QPSK modulator has a phase operator for receiving first and second input data at a predetermined symbol cycle, and for producing a first pair of output data after every even number symbol cycle and producing a second pair of output data after every odd number symbol cycle. The first and second pairs of output data are applied to four digital filters. A selector sequentially selects and produces the four filtered digital data. An invertor inverts the polarity of the filtered digital data after every four filtered digital data from the selector.

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