Receiver for a home phone-lines LAN system
First Claim
1. A receiver in a home phone-lines local area network system, comprising:
- a QAM demodulator for demodulating a received signal into an “
I”
signal and a “
Q”
signal;
an equalizer connected to said QAM demodulator for compensating the “
I”
signal and “
Q”
signal for distortion;
a deconstellation connected to said equalizer for converting the equalized “
I”
signal and the equalized “
Q”
signal into a data signal;
a signal match filter module connected to said QAM demodulator for performing a match operation to generate a match value;
a detector connected to said signal match filter module for detecting a frame type of the received signal according to the match value; and
a data reading module connected to said deconstellation and said detector for reading in the data signal when the frame type is a valid signal frame.
1 Assignment
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Accused Products
Abstract
A receiver in a home phone-lines local area network system is proposed. The receiver can distinguish a valid signal and a collision backoff signal from noises in real time. The receiver for a home phone-lines LAN system comprises a QAM demodulator, an equalizer, a deconstellation, and a transmission data reading device. The receiver further comprises a signal match filter module and a detector. The signal match filter module comprises an adder and at least a cross-correlator. The adder adds the “I” signal and “Q” signal outputted from the QAM demodulator and outputs a combined signal. The cross-correlator performs match operation, such as a comparison operation or a correlation operation, of the combined signal and an identification value and outputs a match value to the detector. Since the signal match filter module connects directly to the output of QAM demodulator, it can immediately identify the identification code TRN16 contained in the received signal. The detector compares the match value with a threshold value and determines whether the received signal frame is a collision backoff signal frame or a valid signal frame. When continuous identification codes TRN16 are detected, the received signal frame is a valid signal frame; whereas when a single identification code TRN16 is detected, the received signal frame is a collision backoff signal frame.
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Citations
8 Claims
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1. A receiver in a home phone-lines local area network system, comprising:
-
a QAM demodulator for demodulating a received signal into an “
I”
signal and a “
Q”
signal;
an equalizer connected to said QAM demodulator for compensating the “
I”
signal and “
Q”
signal for distortion;
a deconstellation connected to said equalizer for converting the equalized “
I”
signal and the equalized “
Q”
signal into a data signal;
a signal match filter module connected to said QAM demodulator for performing a match operation to generate a match value;
a detector connected to said signal match filter module for detecting a frame type of the received signal according to the match value; and
a data reading module connected to said deconstellation and said detector for reading in the data signal when the frame type is a valid signal frame. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
an adder connected to said QAM demodulator for adding up the “
I”
signal and the “
Q”
signal to generate a combined signal; and
at least cross-correlator connected to said adder for performing a correlation operation on the combined signal and an identification value.
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3. The receiver according to claim 2, wherein said signal match filter module includes two sets of cross-correlators with different identification values.
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4. The receiver according to claim 2, wherein each said cross-correlator comprises:
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a plurality of shift buffers connected in series and having an input connected to the combined signal for sequentially shifting the combined signal to the next shift buffer;
a plurality of multipliers connected to said plurality of shift buffers for multiplying values stored in each said shift buffer and the identification values; and
an addition unit connected to said plurality of multipliers for adding up the output values of each said plurality of multipliers to generate the match value.
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5. The receiver according to claim 2, wherein each said cross-correlator comprises:
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a RAM module for storing data of the combined signal circularly;
a ROM module for storing data of the identification value;
a multiplier for multiplying the data output from said RAM module and the data output from said ROM module;
an accumulator for accumulating the value output from the multiplier to generate the match value; and
,a controller for controlling the action of said signal cross-correlator.
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6. The receiver according to claim 1, wherein said detector detects a number of times that the match value exceeds a threshold value within a signal frame.
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7. The receiver according to claim 6, wherein said frame type is a collision backoff signal frame when said number of times is 1.
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8. The receiver according to claim 6, wherein said frame type is a valid signal frame when said number of times is greater than 1.
Specification
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- Resources
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Current AssigneeSilicon Integrated Systems Corporation (Silicon Integrated Systems Corporation Taiwan)
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Original AssigneeSilicon Integrated Systems Corporation (Silicon Integrated Systems Corporation Taiwan)
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InventorsTzou, Ching-kae, Yin, Shih-chung
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Primary Examiner(s)Chin, Stephen
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Assistant Examiner(s)Ha, Dac V.
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Application NumberUS09/551,450Time in Patent Office1,456 DaysField of Search375/142, 375/143, 375/150, 375/152, 375/235, 375/261, 375/316, 375/324, 375/340, 375/343, 375/364, 375/365, 375/368, 375/229, 375/232, 375/354, 375/145, 375/149, 329/304, 329/308, 329/358, 370/509, 370/512, 370/520US Class Current375/261CPC Class CodesH04L 7/042 Detectors therefor, e.g. co...
