H - Electricity – 03 – D
Patent
H - Electricity
03
D
329/16
H03D 1/02 (2006.01) H03D 3/00 (2006.01) H04L 27/38 (2006.01)
Patent
CA 1200854
Abstract In a demodulator for use in deriving demodulated signals from a mod- ulated signal subjected to k-by-k quadrature amplitude-and-phase modulation where k is equal to 2N and N is an integer greater than unity, first and second detection signals, each having k-levels, are derived from the modulated signal by a coherent detecting circuit and processed by first and second processing circuits. Each of the first and the second processing circuits is implemented by a combination of (N-1) full-wave rectifier(s) and (N+2) binary detectors to produce each set of binary signals and each additional binary signal divis- ible into a pair of partial bit signals. Alternatively, each processing circuit is implemented by a combination of N full-wave rectifiers and first through (N+1)-th binary detectors. The first through the N-th detectors detect each set while the (N+1)-th detector, each additional binary signal. Anyway, each set serves to produce the demodulated signals while each addit- ional binary signal, an AGC signal and an APC signal.
435511
Corporation Nec
Smart & Biggar
LandOfFree
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