Adaptable demodulator for arbitrary amplitude and phase keyed mo

Details Adaptable demodulator for arbitrary amplitude and phase keyed mo Adaptable demodulator for arbitrary amplitude and phase keyed mo

1983-08-24

1985-10-08

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 329135, 332 17, 332 19, 332 23R, 375 42, 375 52, 375 67, 375 81, 375 83, 375120, H04L 2720, H04L 2722

Patent

active

045463220

ABSTRACT:
A demodulator for demodulating a received signal which has been modulated in accordance with a modulation scheme which falls within the class of APK modulation. The demodulator uses a phase locked loop (PLL) to recover the carrier. A ROM in the demodulator provides information in both the sweep and locked modes of operation of the PLL to control the PLL. The ROM also provides at its output the digital data which has been encoded at the modulator in accordance with the selected APK scheme. The information stored in the ROM is uniquely determined by the signal points associated with the selected scheme. A modulator for generating the modulated signal received by the demodulator is also disclosed.

REFERENCES:
patent: 3970946 (1976-07-01), Matsuo
patent: 4069462 (1978-01-01), Dunn
patent: 4404530 (1983-09-01), Stryer
patent: 4404532 (1983-09-01), Welti
Franks, "Carrier and Bit Synchronization in Data Communication--A Tutorial Review", IEEE Transactions on Communications, vol. COM-28, No. 8, Aug. 1980, pp. 1107-1121.
Matsuo et al., "Carrier Recovery Systems for Arbitrarily Mapped APK Signals", IEEE Transactions on Communications, vol. COM-30, No. 10, Oct. 1982, pp. 2385-2390.
Oetting, "A Comparison of Modulation Techniques for Digital Radio", IEEE Transactions on Communications, vol. COM-27, No. 12, Dec. 1979, pp. 1752-1762.

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