Robust non-coherent detector for .pi./4-DQPSK signals

Details Robust non-coherent detector for .pi./4-DQPSK signals Robust non-coherent detector for .pi./4-DQPSK signals

1994-05-12

1996-06-11

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375281, 375332, 329306, 329310, H03D 322

Patent

active

055263810

ABSTRACT:
A technique of demodulating a .pi./4-DQPSK composite carrier waveform using a non-coherent discriminator based receiver is presented. In particular, a means of recovering .pi./4-DQPSK modulated data symbols using a dual output discriminator in conjunction with a dual binary amplitude detection process in a discriminator based receiver is discussed. Means which improve the bit error rate of the receiver over the prior art are presented. Additionally, an amplitude detection means which readily provides synchronization of the detected data symbols is discussed which was not heretofore possible with the 4-level slicer of the prior art.

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