Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2007-05-22
2007-05-22
Kim, Kevin (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S332000
Reexamination Certificate
active
10031085
ABSTRACT:
An improved apparatus for receiving BS digital broadcast is disclosed. The apparatus for receiving BS digital broadcast of the present invention has first to third filters and a selective complex calculator circuit.Each of the first to third filters18to20identifies the modulation technique applied to the received signal, by the modulation identification signals A0, A1received from a timing generator circuit25, and filters a phase error signal PED according to the identified modulation technique. The selective complex calculator circuit21shifts the phase of a signal point indicated by an I signal ADI1and a Q signal ADQ1absolute-phased by an absolute-phasing section14,by a phase corresponding to the phase error signal filtered by the first to third filters18to20. At this moment, the selective complex calculator circuit21selects the phase error signal corresponding to the modulation technique identified from the modulation identification signals A0, A1received from the timing generator circuit25. Consequently, in the burst receiving, it is possible to reduce the effect on the error rate because of the signal noise of the ODU to a degree equal to that in the continuous receiving.
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P. Fines et al., Fully Digital M-ary PSK and M-ary QAM Demodulators for Land Mobile Satellite Communications, Electronics & Communication Journal , vol. 3, No. 6, pp. 291-298, Dec. 1991.
A. Horii et al., “Practical Design of Receiver for Satellite Digital Broadcasting”, Digest of Technical Papers, International Conference on Consumer Electronics, 1998, vol. 1998, pp. 68-69.
Horii Akihiro
Matsuda Shoji
Shiraishi Kenichi
Kabushiki Kaisha Kenwood
Kim Kevin
Robinson Eric J.
Robinson Intellectual Property Law Office P.C.
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