Pulse or digital communications – Equalizers – Automatic
Reexamination Certificate
2007-03-20
2007-03-20
Phu, Phuong (Department: 2611)
Pulse or digital communications
Equalizers
Automatic
C375S232000, C375S350000, C375S346000, C708S322000, C708S323000
Reexamination Certificate
active
10413663
ABSTRACT:
A channel equalizing and carrier recovery system for home phoneline networking alliance (HomePNA) receiver and method thereof are provided. The channel equalizing system includes a frequency diverse quadrature amplitude modulation (FD-QAM) equalizer and a quadrature amplitude modulation (QAM) equalizer. The FD-QAM equalizer receives an FD-QAM signal, determines FD-QAM tap coefficients, and equalizes the FD-QAM signal using the FD-QAM tap coefficients. The QAM equalizer receives a QAM signal, determines QAM tap coefficients, and equalizes the QAM signal using the QAM tap coefficients. The QAM equalizer receives the FD-QAM signal and determines the QAM tap coefficients during a predetermined header period. The carrier recovery circuit includes a phase detector, a loop filter, and a numerically controlled oscillator (NCO). The phase detector uses a phase difference between a reception symbol and a decision signal of the reception symbol as an instantaneous phase difference when the reception symbol is a data symbol of an FD-QAM signal or a symbol of a QAM signal, uses “0” as the instantaneous phase difference when the reception symbol is a zero symbol of the FD-QAM signal, averages instantaneous phase differences during a predetermined period or time, and outputs the result of averaging. The loop filter filters the output signal of the phase detector. The NCO generates an oscillation signal having a variable phase in response to an output signal of the loop filter so that a phase error of a reception signal can be controlled.
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Hwang Sung-hyun
Kim Jae-woo
Kim Jung-hoon
Kwon Oh-sang
Park Hyun-cheol
F. Chau & Associates LLC
Phu Phuong
Samsung Electronics Co,. Ltd.
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