PI/4-DQPSK phase state encoder/decoder

Details PI/4-DQPSK phase state encoder/decoder PI/4-DQPSK phase state encoder/decoder

1994-03-31

1995-08-01

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375279, H04L 2710, H04L 2718

Patent

active

054385920

ABSTRACT:
A .pi./4-DQPSK differential phase state encoder/decoder (Codec) is presented which can be implemented using a small number of logic gates. The phase state Codec acts upon data in the transmitter and in the receiver of a .pi./4-DQPSK modulating system whereby the use of a look-up table technique or other off-line procedure to ensure proper phase transitions is not required. The phase state Codec is configured to ensure compliance with the IS-54 standard as well as other similar standards.

REFERENCES:
patent: 3336578 (1967-08-01), Kuflik et al.
patent: 3409831 (1968-11-01), Walker
patent: 5077757 (1991-12-01), Cahill

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