Modulators – Frequency shift keying modulator or minimum shift keying...
Patent
1992-01-21
1993-07-06
David, Mis
Modulators
Frequency shift keying modulator or minimum shift keying...
332103, 332117, 332144, 332149, 375 62, 375 64, 375 67, H03C 100, H03C 300, H03C 500
Patent
active
052257959
ABSTRACT:
A digital quadrature modulator having a first storage device for receiving an I phase component of a digital baseband signal and digital carrier phase information as a higher order address and a lower order address, respectively, and a second storage device for receiving a Q phase component of the digital baseband signal and the digital carrier phase information as a higher order address and a lower order address, respectively. The carrier phases of the carrier phase information applied to the first and the second storage devices are out of phase from each other by .pi./2. The first storage device outputs a multiplication result of the I phase component and a carrier signal and the second storage device outputs a multiplication result of the Q phase component and the carrier signal based on these addresses. These outputs are added to each other in a digital manner and then converted into an analog signal which is supplied as a modulated signal.
REFERENCES:
patent: 4584540 (1986-04-01), DuBose et al.
patent: 5091705 (1992-02-01), Hiramatsu et al.
A. Yongacoglu et al., "Differential Detection of GMSK Using Decision Feedback", IEEE Transactions on Communications, vol. 36, No. 6, Jun. 1988, pp. 641-649.
K. Murota et al., "GMSK Modulation for Digital Mobile Radio Telephony", IEEE Transactions on Communications, vol. COM-29, No. 7, Jul. 1981, pp. 1044-1050.
David Mis
Michaelson Peter L.
Sanyo Electric Co,. Ltd.
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