Digital modulation circuit

Details Digital modulation circuit Digital modulation circuit

H - Electricity

03

C

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

Patent

CA 2077899

A modulator circuit for generating a modulated, DQPSK signal. The modulator circuit includes an encoder for receiving a binary bit stream comprised of bit pairs defining differential phase changes. An encoder receives a bit stream of which bit pairs thereof define differential phase changes. The encoder encodes the bit pairs into codewords which are stored and then supplied to an I-accumulator a Q-accumulator, and a memory element The memory element contains pre-multiplied values which are supplied to the I- and the Q- accumulators which add terms of the pre-multiplied values to form I- portions and Q-portions of a DQPSK-modulated signal. The I- and Q- portions of a DQPSK-modulated signal. The I- and Q- portions may then be supplied to a quadrature modulator.

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