US 7,924,952 B2Granted

Signal detection device, signal detection circuit, signal detection method, and program

AssigneePanasonic Corporation

InventorsKazuaki Suzuki, Mikihiro Ouchi

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Abstract

A signal detection device rapidly and accurately detects a desired signal from a reception signal. A correlation unit 231 outputs a correlation value string obtained by cross-correlating an input symbol string and a reference symbol string, a first position detection unit 232 detects a position of a correlation value viewed as a maximum or a local maximum on the correlation value string, a compensation unit 233 performs compensation by suppressing correlation error values from correlation value at positions other than the detected position, a second position detection unit 234 detects a position of a correlation value viewed as the maximum on the compensated correlation value string, and a sync-detected signal generation unit 235 outputs a sync-detected signal based on the position detected by the second position detection unit 234.

Claims12

Dependent claims

A signal detection device comprising:

a correlation unit operable to output a correlation value string based on a result of cross-correlating (i) a reference signal value string included in an input signal value string and (ii) signal value strings that are obtained by shifting a certain signal value string one by one in an order of the input signal value string, and that correspond in length to the reference signal value string;
a first position detection unit operable to detect a first position in the correlation value string output by the correlation unit, the first position being based on a position of a correlation value viewed as a maximum or a local maximum;
and
a compensation unit operable to perform compensation, using a processor, by obtaining a correlation error of at least one of the output correlation values and suppressing the correlation error from the at least one correlation value, wherein
the compensation unit performs the compensation by obtaining the correlation error of the correlation value at at least one position other than the first position detected by the first position detection unit, and suppressing the correlation error from the at least one correlation value, and
the compensation unit performs the compensation by associating the first position detected by the first position detection unit and a position of a maximum on a correlation error value string that is based on a result of cross-correlating the reference signal value string and signal value strings which are obtained by shifting a certain signal value string one by one in order of a known signal value string including the reference signal value string and which correspond in length to the reference signal value string, and suppressing, based on a correlation error value at a position in the correlation error value string corresponding to a second position other than the first position, the correlation error from a correlation value at the second position.

3 more elements

A detection device wherein comprising:

a correlation unit operable to output a correlation value string based on a result of cross-correlating (i) a reference signal value string included in an input signal value string and (ii) signal value strings that are obtained by shifting a certain signal value string one by one in an order of the input signal value string, and that correspond in length to the reference signal value string;
a first position detection unit operable to detect a first position in the correlation value string output by the correlation unit, the first position being based on a position of a correlation value viewed as a maximum or a local maximum;
and
a compensation unit operable to perform compensation, using a processor, by obtaining a correlation error of at least one of the output correlation values and suppressing the correlation error from the at least one correlation value, wherein
the compensation unit performs the compensation by obtaining the correlation error of the correlation value at at least one position other than the first position detected by the first position detection unit, and suppressing the correlation error from the at least one correlation value,
the first position detection unit detects a maximum position that is a position corresponding to a correlation value viewed as the maximum on the correlation value string, and a local maximum position that is a position corresponding to a correlation value viewed as the local maximum on the correlation value string, and
the compensation unit performs the compensation by one of
associating the local maximum position and a position of a maximum on a correlation error value string that is based on a result of cross-correlating the reference signal value string and signal value strings which are obtained by shifting a certain signal value string one by one in order of a known signal value string including the reference signal value string and which correspond in length to the reference signal value string, obtaining a correlation error value on the correlation error value string at a position corresponding to the maximum position, and suppressing, based on the correlation error value, a correlation error from the correlation value at the maximum position, and
associating the maximum position and a position of a maximum on the correlation error value string, obtaining a correlation error value on the correlation error value string at a position corresponding to the local maximum position, and suppressing, based on the correlation error value, a correlation error from the correlation value at the local maximum position.

6 more elements

A signal detection device comprising:

a correlation unit operable to output a correlation value string based on a result of cross-correlating (i) a reference signal value string included in an input signal value string and (ii) signal value strings that are obtained by shifting a certain signal value string one by one in an order of the input signal value string, and that correspond in length to the reference signal value string;
a first position detection unit operable to detect a first position in the correlation value string output by the correlation unit, the first position being based on a position of a correlation value viewed as a maximum or a local maximum;
and
a compensation unit operable to perform compensation, using a processor, by obtaining a correlation error of at least one of the output correlation values and suppressing the correlation error from the at least one correlation value, wherein
the compensation unit performs the compensation by obtaining the correlation error of the correlation value at at least one position other than the first position detected by the first position detection unit, and suppressing the correlation error from the at least one correlation value,
the first position detection unit detects a maximum position that is a position in the correlation value string which corresponds to a correlation value viewed as the maximum, and a local maximum position that is a position in the correlation value string which corresponds to a correlation value viewed as the local maximum, and
the compensation unit performs the compensation by associating the maximum position and a position of a maximum on a correlation error value string that is based on a result of cross-correlating the reference signal value string and signal value strings which are obtained by shifting a certain signal value string one by one in order of a known signal value string including the reference signal value string and which correspond in length to the reference signal value string, obtaining a first correlation error value on the correlation error value string at a position corresponding to the local maximum position, associating the local maximum position and the position of the maximum on the correlation error value string, obtaining a second correlation error value on the correlation error value string at a position corresponding to the maximum position, and one of
suppressing, based on a first composite correlation error value obtained by subtracting the second correlation error value from the first correlation error value, a correlation error from the correlation value at the local maximum position, and
suppressing, based on a second composite correlation error value obtained by subtracting the first correlation error value from the second correlation error value, a correlation error from the correlation value at the maximum position or the local maximum position.

6 more elements

A signal detection circuit comprising:

a correlation circuit operable to output a correlation value string based on a result of cross-correlating (i) a reference signal value string included in an input signal value string and (ii) signal value strings that are obtained by shifting a certain signal value string one by one in an order of the input signal value string, and that correspond in length to the reference signal value string;
a first position detection circuit operable to detect a first position in the correlation value string output by the correlation circuit, the first position being based on a position of a correlation value viewed as a maximum or a local maximum;
and
a compensation circuit operable to perform compensation by obtaining a correlation error of at least one of the output correlation values and suppressing the correlation error from the at least one correlation value, wherein
the compensation circuit performs the compensation by obtaining the correlation error of the correlation value at at least one position other than the first position detected by the first position detection circuit, and suppressing the correlation error from the at least one correlation value,
the first position detection circuit detects a maximum position that is a position corresponding to a correlation value viewed as the maximum on the correlation value string, and a local maximum position that is a position corresponding to a correlation value viewed as the local maximum on the correlation value string, and
the compensation circuit performs the compensation by one of
associating the local maximum position and a position of a maximum on a correlation error value string that is based on a result of cross-correlating the reference signal value string and signal value strings which are obtained by shifting a certain signal value string one by one in order of a known signal value string including the reference signal value string and which correspond in length to the reference signal value string, obtaining a correlation error value on the correlation error value string at a position corresponding to the maximum position, and suppressing, based on the correlation error value, a correlation error from the correlation value at the maximum position, and
associating the maximum position and a position of a maximum on the correlation error value string, obtaining a correlation error value on the correlation error value string at a position corresponding to the local maximum position, and suppressing, based on the correlation error value, a correlation error from the correlation value at the local maximum position.

6 more elements

A signal detection circuit comprising:

a correlation circuit operable to output a correlation value string based on a result of cross-correlating (i) a reference signal value string included in an input signal value string and (ii) signal value strings that are obtained by shifting a certain signal value string one by one in an order of the input signal value string, and that correspond in length to the reference signal value string;
a first position detection circuit operable to detect a first position in the correlation value string output by the correlation circuit, the first position being based on a position of a correlation value viewed as a maximum or a local maximum;
and
a compensation circuit operable to perform compensation by obtaining a correlation error of at least one of the output correlation values and suppressing the correlation error from the at least one correlation value, wherein
the compensation circuit performs the compensation by obtaining the correlation error of the correlation value at at least one position other than the first position detected by the first position detection circuit, and suppressing the correlation error from the at least one correlation value,
the first position detection circuit detects a maximum position that is a position in the correlation value string which corresponds to a correlation value viewed as the maximum, and a local maximum position that is a position in the correlation value string which corresponds to a correlation value viewed as the local maximum, and
the compensation circuit performs the compensation by associating the maximum position and a position of a maximum on a correlation error value string that is based on a result of cross-correlating the reference signal value string and signal value strings which are obtained by shifting a certain signal value string one by one in order of a known signal value string including the reference signal value string and which correspond in length to the reference signal value string, obtaining a first correlation error value on the correlation error value string at a position corresponding to the local maximum position, associating the local maximum position and the position of the maximum on the correlation error value string, obtaining a second correlation error value on the correlation error value string at a position corresponding to the maximum position, and one of
suppressing, based on a first composite correlation error value obtained by subtracting the second correlation error value from the first correlation error value, a correlation error from the correlation value at the local maximum position, and
suppressing, based on a second composite correlation error value obtained by subtracting the first correlation error value from the second correlation error value, a correlation error from the correlation value at the maximum position or the local maximum position.

6 more elements

A signal detection circuit comprising:

a correlation circuit operable to output a correlation value string based on a result of cross-correlating (i) a reference signal value string included in an input signal value string that includes another reference signal value string specifying a signal mode of an input signal and (ii) signal value strings that are obtained by shifting a certain signal value string one by one in an order of the input signal value string, and that correspond in length to the reference signal value string;
a mode detection circuit operable to detect the another reference signal value string based on the input signal value string;
a compensation circuit operable to perform compensation by obtaining a correlation error of at least one of the output correlation values and suppressing the correlation error from the at least one correlation value;
a first position detection circuit operable to detect a first position in the correlation value string output by the correlation circuit, the first position being based on a position of a correlation value viewed as a maximum or a local maximum;
and
a second position detection circuit operable to detect a second position in the correlation value string compensated by the compensation circuit, the second position being based on a position of a correlation value viewed as a maximum on the compensated correlation value string, wherein
the compensation circuit performs the compensation based on a signal mode detected by the mode detection circuit and the correlation error,
the mode detection circuit comprises:
a third correlation circuit operable to specify a position section of a mode signal value string in the input signal with use of output from the first position detection circuit or the second position detection circuit, and cross-correlate a signal value string in the position section and the another reference signal value string that is at least a part of one of a plurality of the mode signal value strings each of which is for identifying a different one of the signal modes;
a cumulative addition circuit operable to cumulatively add correlation values calculated by the third correlation circuit to the plurality of mode signal value strings N times, N being a natural number;
and
a mode specification circuit operable to specify, from among the plurality of mode signal value strings, a mode signal value string having a highest value cumulatively added by the cumulative addition circuit, as a signal mode of the input signal string.

9 more elements

A signal detection circuit comprising:

a correlation circuit operable to output a correlation value string based on a result of cross-correlating (i) a reference signal value string included in an input signal value string that includes another reference signal value string specifying a signal mode of an input signal and (ii) signal value strings that are obtained by shifting a certain signal value string one by one in an order of the input signal value string and that correspond in length to the reference signal value string;
a mode detection circuit operable to detect the third reference signal value string based on the input signal value string;
a compensation circuit operable to perform compensation by obtaining a correlation error of at least one of the output correlation values and suppressing the correlation error from the at least one correlation value;
a first position detection circuit operable to detect a first position in the correlation value string output by the correlation circuit, the first position being based on a position of a correlation value viewed as a maximum or a local maximum;
and
a second position detection circuit operable to detect a second position in the correlation value string compensated by the compensation circuit, the second position being based on a position of a correlation value viewed as a maximum on the compensated correlation value string, wherein
the compensation circuit performs the compensation based on a signal mode detected by the mode detection circuit and the correlation error,
the mode detection circuit comprises:
a third correlation circuit operable to (i) output correlation values with respect to a certain mode signal value string by specifying a position section of a mode signal value string in the input signal with use of output from the first position detection circuit or the second position detection circuit, and cross-correlating a signal value string in the position section and the another reference signal value string that is at least a part of one of a plurality of the mode signal value strings each of which is for identifying a different one of the signal modes, and (ii) output values obtained by inverting a sign of the correlation values as correlation values with respect to another mode signal value string;
a cumulative addition circuit operable to cumulatively add correlation values calculated by the third correlation circuit to the plurality of mode signal value strings N times, N being a natural number;
and
a mode specification circuit operable to specify, from among the plurality of mode signal value strings, a mode signal value string having a highest value cumulatively added by the cumulative addition circuit, as a signal mode of the input signal string.

9 more elements

Dependencies are inferred from the claim text.