H - Electricity – 04 – L
Patent
H - Electricity
04
L
329/3
H04L 27/06 (2006.01) H04L 27/38 (2006.01)
Patent
CA 1262266
Abstract of the Disclosure: In a demodulation system comprising a demodulator (22) which demodulates a quadrature amplitude modulated signal into first and second sets of output digital signals by the use of a reference carrier signal (CA), a specific phase control signal is produced in a transient state by discriminating a plurality of areas and a plurality of zones defined on a phase plane of the modulated signal. The areas are defined by dividing the phase plane by both a pair of quadrant reference axes and a pair of auxiliary reference axes phase shifted by .pi./4 (radians) relative to the quadrant decision axes. The zones are defined along and adjacent to the auxiliary reference axes. First and second detection signals (S1 and S2) are produced by a read-only memory (35) as results of discrimination of the areas and the zones, respectively. The specific phase control signal is switched to a normal phase control signal produced in a normal state in the known manner. Alternatively, the first and the second detection signals may be supplied to a transversal equalizer (21) for controlling imaginary part weighting control signals.
516027
Matsuura Toru
Tahara Masato
Yagi Manabu
Yoshida Yasuharu
Corporation Nec
Smart & Biggar
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