Channel equalizing and carrier recovery system for home phoneline networking alliance receiver and method thereof
First Claim
1. An adaptive channel equalizing system for a home phoneline networking alliance (HomePNA) receiver, the channel equalizing system comprising:
- a frequency diverse quadrature amplitude modulation (FD-QAM) equalizer for determining FD-QAM tap coefficients and equalizing an FD-QAM signal input into the adaptive channel equalizing system; and
a quadrature amplitude modulation (QAM) equalizer for receiving the FD-QAM signal determines QAM tap coefficients during a predetermined header period, and continuously updating the QAM tap coefficients during a predetermined payload period to equalize the QAM signal upon receiving the QAM signal.
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Accused Products
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.
28 Citations
18 Claims
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1. An adaptive channel equalizing system for a home phoneline networking alliance (HomePNA) receiver, the channel equalizing system comprising:
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a frequency diverse quadrature amplitude modulation (FD-QAM) equalizer for determining FD-QAM tap coefficients and equalizing an FD-QAM signal input into the adaptive channel equalizing system; and
a quadrature amplitude modulation (QAM) equalizer for receiving the FD-QAM signal determines QAM tap coefficients during a predetermined header period, and continuously updating the QAM tap coefficients during a predetermined payload period to equalize the QAM signal upon receiving the QAM signal. - View Dependent Claims (2, 3, 4)
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5. An adaptive channel equalizing system for a home phoneline networking alliance (HomePNA) receiver, the channel equalizing system comprising:
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a frequency diverse quadrature amplitude modulation (FD-QAM) equalizer for receiving an FD-QAM signal, determining FD-QAM tap coefficients, and equalizing the FD-QAM signal using the FD-QAM tap coefficients; and
a quadrature amplitude modulation (QAM) equalizer for receiving a QAM signal, determining QAM tap coefficients, and equalizes the QAM signal using the QAM tap coefficients, wherein the QAM equalizer receives the FD-QAM signal and determines the QAM tap coefficients during a predetermined header period. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A carrier recovery circuit for a home phoneline networking alliance (HomePNA) receiver, the carrier recovery circuit comprising:
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a phase detector for detecting a phase difference between a reception symbol and a decision signal of the reception symbol to obtain an instantaneous phase difference, determining an average instantaneous phase difference during a predetermined period, and outputting the average instantaneous phase difference;
a loop filter for filtering the output signal of the phase detector; and
a numerically controlled oscillator (NCO) for generating an oscillation signal having a variable phase in response to an output signal of the loop filter, wherein the phase detector uses a phase difference between the reception symbol and the decision signal of the reception symbol as the instantaneous phase difference when the reception symbol is a data symbol of a frequency diverse quadrature amplitude modulation (FD-QAM) signal or a symbol of a quadrature amplitude modulation (QAM) signal and uses “
0”
as the instantaneous phase difference when the reception symbol is a zero symbol of the FD-QAM signal. - View Dependent Claims (13)
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14. An adaptive channel equalizing method for a home phoneline networking alliance (HomePNA) receiver, the channel equalizing method comprising:
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(a) receiving a frequency diverse quadrature amplitude modulation (FD-QAM) signal during a predetermined header period, determining FD-QAM tap coefficients, and equalizing the FD-QAM signal using the FD-QAM tap coefficients;
(b) receiving the FD-QAM signal during the header period and determining quadrature amplitude modulation (QAM) tap coefficients;
(c) updating, continuously, the FD-QAM tap coefficients to equalize the FD-QAM signal upon receiving the FD-QAM signal during a predetermined payload period; and
(d) updating, continuously, the QAM tap coefficients to equalize the QAM signal upon receiving a QAM signal is received during the payload period. - View Dependent Claims (15, 16, 17)
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18. A carrier recovery method for a home phoneline networking alliance (HomePNA) receiver, the carrier recovery method comprising:
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(a) detecting a phase difference between a reception symbol of a reception signal and a decision signal of the reception symbol to obtain an instantaneous phase difference and averaging instantaneous phase differences during a. predetermined period to output an average phase difference;
(b) filtering the average phase difference;
(c) generating an oscillation signal having a variable phase in response to the filtered average phase difference; and
(d) multiplying the reception signal by the oscillation signal, wherein step (a) comprises using a phase difference between the reception symbol and the decision signal of the reception symbol as the instantaneous phase difference when the reception symbol is a data symbol of a frequency diverse quadrature amplitude modulation (FD-QAM) signal or a symbol of a quadrature amplitude modulation (QAM) signal and using “
0”
as the instantaneous phase difference when the reception symbol is a zero symbol of the FD-QAM signal.
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Specification