Process for transmitting digital signals which combines advantag

Details Process for transmitting digital signals which combines advantag Process for transmitting digital signals which combines advantag

1995-02-23

1997-03-25

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

375283, 375331, H04L 2718

Patent

active

056152302

ABSTRACT:
A process for transmitting digital signals, in which the digital data are coded differentially in symbols of a symbol period T.sub.s (2.1, 2.2), the symbols transmitted with the Q component being delayed by T.sub.s /2, relative to those of the I component, to achieve a time-staggering. A cross interference of the I and Q components, occurring on the receiver end and caused by the differential coding nd the time staggering, is resolved with a trellis decoder (10), for example. As a result, a differential offset QPSK process achieved on this basis combines the advantages of DQPSK and OQPSK procedures.

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