Digital modulation circuit

Details Digital modulation circuit Digital modulation circuit

1991-04-01

1992-10-20

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 52, 375 54, 375 56, 332103, H04L 2720

Patent

active

051576937

ABSTRACT:
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 may then be supplied to a quadrature modulator.

REFERENCES:
patent: 4358853 (1982-11-01), Qureshi
patent: 4613976 (1986-09-01), Sewerinson et al.
patent: 4672634 (1987-06-01), Chung et al.
patent: 4680556 (1987-07-01), Nakamura et al.

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