Adaptable demodulator for arbitrary amplitude and phase...

H - Electricity – 03 – D

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329/1, 332/39

H03D 5/00 (2006.01) H04L 27/38 (2006.01)

Patent

CA 1243368

ADAPTABLE DEMODULATOR FOR ARBITRARY AMPLITUDE AND PHASE KEYED MODULATION SIGNALS ABSTRACT OF THE DISCLOSURE 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 sweeped and locked modes of opera- tion 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.

459831

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