H - Electricity – 03 – D
Patent
H - Electricity
03
D
H03D 3/04 (2006.01) H04L 27/233 (2006.01)
Patent
CA 2180908
A QPSK demodulator that can be made smaller in size and lower in cost by restricting a storage capacity needed for a TAN-1 ROM to a minimum. Values of I and Q channel base band signals obtained by converting and quantizing a received signal is approximated to a nearest one of values on (2N-3 + 1) segment lines represented by Q=(n/2N-3)I, where n=0, 1, ..., 2N-3, with a phase accuracy of positive N bits. Data corresponding to the approximated segment line is previously stored in a TAN-1 ROM as phase arithmetic data. An address decoder converts each base band signal into an address. An arithmetic circuit obtains phase data, for obtaining a QPSK demodulated signal, by performing a predetermined arithmetic operation, which is commensurate with the size of I and Q channel base band signals, on phase arithmetic data stored in the TAN-1 ROM in association with the converted address.
Gowling Lafleur Henderson Llp
Mitsubishi Denki Kabushiki Kaisha
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