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Direct differential detection of phase-shift-keyed signals: a local-oscillatorless DPSK receiver

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1 Author(s)
Bar-David, I. ; Dept. of Electr. Eng., Technion-Israel Inst. of Technol., Haifa, Israel

The phase-diversity mixing concept, originally applied in communication receivers to local-oscillator-aided reception, is here applied to the direct (i.e. local-oscillatorless) differential detection (D3) of phase-shift-keyed (PSK) transmissions. The received signal and its delay replica are first compared by means of a quadrature mixer, directly at the receiver front end, at the optical or microwave signal stage. The baseband phase-diversity signals thus obtained are linearly transformed in a baseband phase equaliser, and thus cancel out undesired, detrimental phase shifts which invariably occur in the wave-generating and wave-conveying components. The resulting D3 PSK receiver is robust under variations in carrier frequency and in differential delay. Its development establishes coherent modulation methods, such as PSK and narrowband FSK, as viable alternatives to on/off keying, which at present is exclusively used in direct detection systems

Published in:

Optoelectronics, IEE Proceedings -  (Volume:141 ,  Issue: 1 )