Coherent PSK detector not requiring carrier recovery

Details Coherent PSK detector not requiring carrier recovery Coherent PSK detector not requiring carrier recovery

1995-10-30

1996-11-12

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

329310, 375324, 375328, 375329, 375331, H03D 300, H04L 27233

Patent

active

055743994

ABSTRACT:
A coherent phase-shift keying (PSK) detector in a receiver generates an unmodulated carrier signal, without attempting to synchronize the unmodulated carrier signal in frequency or phase to the carrier employed at the PSK transmitter. The instantaneous phase of the received PSK signal is detected with reference to the unmodulated carrier signal to create an instantaneous phase signal. Phase rotation due to frequency offset between the two carrier signals is detected and removed from the instantaneous phase signal, then a remaining phase offset is detected and removed. Data are recovered from the resulting instantaneous phase signal.

REFERENCES:
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patent: 5506873 (1996-04-01), Suzuki
S. Yoshida, "A New Coherent Demodulation Technique for Land-Mobile Satellite Communications," 1990 Autumn National Meeting of the Institute of Electronics, Information, and Communication Engineers, B-169 (p. 2-169).
Y. Matsumoto et al., "A Study on pi/4-shift QPSK Coherent Detection Scheme," 1992 Autumn Meeting of the Institute of Electronics, Information, and Communication Engineers, B-241 (p. 2-244).
T. Sakata et al, "An Open Loop Coherent Detection Scheme," 1993 Autumn Meeting of The Institute of Electronics, Information, and Communication Engineers, B-300 (p. 2-300).
Y. Matsumoto et al, "a Low Power Demodulator LSIC for Personal Communication--High Performance Coherent Detection Demodulator, "Technical Report of IEICE, DSP94-18, RCS94-9 (May 1992), pp. 57-63.
Nakamura et al, U. S. patent application Serial Number 08/307,632, filed Sep. 10, 1995.

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