Demodulators – Phase shift keying or quadrature amplitude demodulator
Patent
1992-10-06
1994-02-15
Grimm, Siegfried H.
Demodulators
Phase shift keying or quadrature amplitude demodulator
329306, 329341, 375 80, H04L 2722, H04L 2738
Patent
active
052870677
ABSTRACT:
A method and an apparatus for demodulation with adaptive phase control in quasi-coherent detection, capable of compensating detection phase error due to the initial phase error and the frequency error at high speed and high quality, without a complicated circuit configuration and a significant delay. In the apparatus, a frequency error in the modulated complex input signals is estimated by using a phase variation during one symbol due to the frequency error according to the modulated complex input signals and the demodulated complex signals for present and immediately previous symbols; an initial phase error in the modulated complex input signals is estimated according to the modulated complex input signals, the demodulated complex signals, and the estimated frequency error; and the demodulated complex signals are obtained by applying optimum phase compensation determined according to the estimated frequency error and the estimated initial phase error, to the modulated complex input signals.
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1988 IEEE International Symposium on Circuits and Systems ISCAS '88, 07.09.06.1988, Espoo, FI, vol. 2, pp. 1815-1818, IEEE, New York; P. Eglin et al. Digital Implementation of a Coherent CPM System for Mobile Radio.
Denno Satoshi
Saito Yoichi
Grimm Siegfried H.
Nippon Telegraph and Telephone Corporation
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