Sampling timing phase error detector for VSB modulation signal
AssigneePioneer Electronics Corporation
InventorYoshinori Abe
Life of this patent
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Abstract
A sampling timing phase error detector in a VSB modulation signal which can realize a high speed transmission. The sampling timing phase error detector for detecting a timing phase error of a sampling from a discrete time sequence obtained by sampling, by a frequency n.multidot.fs (n is a positive integer), a multivalue VSB modulation signal in which transmission symbol sequence of real numbers is processed by a VSB modulation at a symbol frequency fs obtains the timing phase error on the basis of signals obtained by detecting the discrete time sequence at frequencies around a Nyquist frequency fs/2 as a center.
Claims8
A sampling timing phase error detector for detecting a timing phase error of a sampling from a discrete time sequence obtained by sampling a multivalue VSB modulation signal, at a frequency n.multidot.fs (n is a positive integer), which is obtained by a VSB modulation of a transmission symbol sequence of real numbers with a symbol frequency fs,
- wherein said timing phase error is obtained on the basis of signals obtained by detecting said discrete time sequence at frequencies around a Nyquist frequency fs/2 as a center.
A sampling timing phase error detector for detecting a timing phase error of a sampling from a discrete time sequence obtained by sampling a multivalue VSB modulation signal, at a frequency n.multidot.fs (n is a positive integer), which is obtained by a VSB modulation of a transmission symbol sequence of real numbers with a symbol frequency fs, comprising:
- frequency converting means for obtaining complex frequency conversion sequence by complex frequency converting said discrete time sequence so that a Nyquist frequency fs/2 of said discrete time sequence forms a DC component;
- complex square computing means for obtaining a complex square sequence by a complex squaring of said complex frequency conversion sequence;
- a filter for extracting a DC complex component from said complex square sequence and setting said DC complex component to said timing phase error;
- and
- phase angle converting means for converting said DC complex square sequence to a phase angle to generate said timing phase error.
A sampling timing phase error detecting method of detecting a timing phase error of a sampling from a discrete time sequence obtained by sampling, by a frequency n.multidot.fs (n is a positive integer), a multivalue VSB modulation signal in which a transmission symbol sequence of real numbers was VSB modulated at a symbol frequency fs, comprising the steps of:
- obtaining a complex frequency conversion sequence by complex frequency converting said discrete time sequence so that a Nyquist frequency fs/2 of said discrete time sequence forms a DC component;
- and
- obtaining said timing phase error on the basis of a signal obtained by detection of said discrete time sequence.
A sampling timing phase error detecting method of detecting a timing phase error of a sampling from a discrete time sequence obtained by sampling, by a frequency n.multidot.fs (n is a positive integer), a multivalue VSB modulation signal in which transmission symbol sequence of real numbers was VSB modulated at a symbol frequency fs, comprising the steps of:
- obtaining complex frequency conversion sequence by complex frequency converting said discrete time sequence so that a Nyquist frequency fs/2 of said discrete time sequence forms a DC component;
- obtaining a complex square sequence by a complex squaring of said complex frequency conversion sequence obtained;
- extracting a DC complex component from said complex square sequence obtained;
- and
- obtaining said timing phase error on the basis of said extracted DC complex component.
A sampling timing phase error detector for detecting a timing phase error of a sampling from a discrete time sequence obtained by sampling a multivalue VSB modulation signal, at a frequency n.multidot.fs (n is a positive integer), which is obtained by a VSB modulation of a transmission symbol sequence of real numbers with a symbol frequency fs,
- wherein said timing phase error is obtained on the basis of signals obtained by detecting said discrete time sequence at frequencies around a Nyquist frequency fs/2 as a center, such that a sampling clock signal synchronized with the transmission symbol sequence can be autonomously formed from the multivalue VSB modulation signal.
A sampling timing phase error detector for detecting a timing phase error of a sampling from a discrete time sequence obtained by sampling a multivalue VSB modulation signal, at a frequency n.multidot.fs (n is a positive integer), which is obtained by a VSB modulation of a transmission symbol sequence of real numbers with a symbol frequency fs, comprising:
- a signal input for receiving a sampling from said discrete time sequence;
- a detector for detecting said discrete time sequence at frequencies around a Nyquist frequency fs/2 as a center;
- and
- circuitry for detecting said timing phase error of the sampling based on signals obtained by the detector for detecting said discrete time sequence .
Dependencies are inferred from the claim text.