| (11) | EP 3 190 714 B1 |
(12) | EUROPEAN PATENT SPECIFICATION |
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(54) | METHOD AND APPARATUS FOR ACQUIRING CHANNEL TRANSMISSION CHARACTERISTICS VERFAHREN UND VORRICHTUNG ZUR ERFASSUNG VON MERKMALEN EINES ÜBERTRAGUNGSKANALS PROCÉDÉ ET APPAREIL D'ACQUISITION DE CARACTÉRISTIQUES DE TRANSMISSION DE CANAL |
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Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
TECHNICAL FIELD
BACKGROUND
SUMMARY
obtaining transmission characteristic curves of at least two channels from a cable modem to a cable modem termination system of a hybrid fiber-coaxial network in a channel scanning manner, where one characteristic curve reflects amplitudes of one channel at all frequencies, the at least two channels form one contiguous frequency band, and frequencies corresponding to the transmission characteristic curves of the at least two channels have frequency values on a same order of magnitude, and have amplitude values on a same order of magnitude;
translating the transmission characteristic curves of the channels in an amplitude direction, to make amplitudes corresponding to same frequencies on all transmission characteristic curves overlapped, so as to form one continuous curve; and
using the continuous curve as a transmission characteristic curve of the contiguous frequency band.
calculating a difference between amplitudes corresponding to a same frequency on transmission characteristic curves of any two adjacent channels, and using the difference as a first distance MovedV;
fixing a transmission characteristic curve of one channel in the any two adjacent channels, and translating a transmission characteristic curve of the other channel in an amplitude direction by the first distance MovedV, to make the amplitudes corresponding to the same frequency on the transmission characteristic curves of the two adjacent channels overlapped, so as to form a transmission characteristic curve corresponding to a frequency band including the two adjacent channels; and
continuing to execute the foregoing steps for the transmission characteristic curve corresponding to the frequency band including the adjacent channels, until transmission characteristic curves corresponding to all channels form one continuous curve.
calculating differences between amplitudes corresponding to all the same frequencies on the transmission characteristic curves of the adjacent channels; and
calculating an average value of the differences between the amplitudes corresponding to all the same frequencies, and using the average value as the first distance MovedV.
collecting pre-equalization coefficients of the at least two channels in the cable modem; and
obtaining the transmission characteristic curves of the channels according to the pre-equalization coefficients of the at least two channels.
collecting transmit power of the cable modem and receive power of the cable modem termination system that are corresponding to each of the channels;
obtaining line attenuation power according to the transmit power and the receive power corresponding to each of the channels; and
shifting upward the transmission characteristic curve of the frequency band in an amplitude direction by a value of the line attenuation power, to obtain an absolute value of a transmission characteristic of the frequency band.
an obtaining module, configured to obtain transmission characteristic curves of at least two channels from a cable modem to a cable modem termination system of a hybrid fiber-coaxial network in a channel scanning manner, where one characteristic curve reflects amplitudes of one channel at all frequencies, the at least two channels form one contiguous frequency band, and frequencies corresponding to the transmission characteristic curves of the at least two channels have frequency values on a same order of magnitude, and have amplitude values on a same order of magnitude; and
a processing module, configured to translate the transmission characteristic curves of the channels in an amplitude direction, to make amplitudes corresponding to same frequencies on all transmission characteristic curves overlapped, so as to form one continuous curve; and use the continuous curve as a transmission characteristic curve of the contiguous frequency band.
calculate a difference between amplitudes corresponding to a same frequency on transmission characteristic curves of any two adjacent channels, and use the difference as a first distance MovedV;
fix a transmission characteristic curve of one channel in the any two adjacent channels, and translate a transmission characteristic curve of the other channel in an amplitude direction by the first distance MovedV, to make the amplitudes corresponding to the same frequency on the transmission characteristic curves of the two adjacent channels overlapped, so as to form a transmission characteristic curve corresponding to a frequency band including the two adjacent channels; and
continue to execute the foregoing steps for the transmission characteristic curve corresponding to the frequency band including the adjacent channels, until transmission characteristic curves corresponding to all channels form one continuous curve.
calculate differences between amplitudes corresponding to all the same frequencies on the transmission characteristic curves of the adjacent channels; and
calculate an average value of the differences between the amplitudes corresponding to all the same frequencies, and use the average value as the first distance MovedV.
collect pre-equalization coefficients of the at least two channels in the cable modem; and
obtain the transmission characteristic curves of the channels according to the pre-equalization coefficients of the at least two channels.
collect transmit power of the cable modem and receive power of the cable modem termination system that are corresponding to each of the channels; and
the processing module is further configured to:
obtain line attenuation power according to the transmit power and the receive power corresponding to each of the channels; and
shift upward the transmission characteristic curve of the frequency band in an amplitude direction by a value of the line attenuation power, to obtain an absolute value of a transmission characteristic of the frequency band.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a schematic diagram of a typical HFC network;
FIG. 2 is a flowchart of a channel transmission characteristic obtaining method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an overlapped area of two adjacent channels;
FIG. 4 is a schematic diagram of transmission characteristic curves of multiple channels in a CM;
FIG. 5 is a transmission characteristic curve that is obtained by means of translation and that is of an entire to-be-measured frequency band;
FIG. 6 is a channel transmission characteristic absolute value curve corresponding to the channel transmission characteristic curve shown in FIG. 5;
FIG. 7 is a schematic structural diagram of a channel transmission characteristic obtaining apparatus according to an embodiment of the present invention; and
FIG. 8 is a schematic structural diagram of a server that can be used for obtaining a channel transmission characteristic according to an embodiment of the present invention.
DESCRIPTION OF EMBODIMENTS
calculate a difference between amplitudes corresponding to a same frequency on transmission characteristic curves of any two adjacent channels, and use the difference as a first distance MovedV;
fix a transmission characteristic curve of one channel in the any two adjacent channels, and translate a transmission characteristic curve of the other channel in an amplitude direction by the first distance MovedV, to make the amplitudes corresponding to the same frequency on the transmission characteristic curves of the two adjacent channels overlapped, so as to form a transmission characteristic curve corresponding to a frequency band including the two adjacent channels; and
continue to execute the foregoing steps for the transmission characteristic curve corresponding to the frequency band including the adjacent channels, until transmission characteristic curves corresponding to all channels form one continuous curve.
calculate a difference between amplitudes corresponding to a same frequencies on transmission characteristic curves of any two adjacent channels, and use the difference as a first distance MovedV;
fix a transmission characteristic curve of one channel in the any two adjacent channels, and translate a transmission characteristic curve of the other channel in an amplitude direction by the first distance MovedV, to make the amplitudes corresponding to the same frequencies on the transmission characteristic curves of the two adjacent channels overlapped; and
repeatedly execute the foregoing steps, until transmission characteristic curves corresponding to all channels form one continuous curve.
calculate a difference between amplitudes corresponding to a same frequency on transmission characteristic curves of any two adjacent channels, and use the difference as a first distance MovedV, where a first distance corresponding to a transmission characteristic curve of a jth channel is MovedVj, and j is an integer greater than 1 and less than or equal to N;
calculate a second distance corresponding to a transmission characteristic curve of an ith channel according to the following formula:
where MovedPoweri is the second distance corresponding to the transmission characteristic curve of the ith channel, and i is an integer greater than 1 and less than or equal to N; and
fix a transmission characteristic curve of the first channel, and separately translate transmission characteristic curves of the other channels in an amplitude direction by second distances corresponding to the transmission characteristic curves of the channels, to make amplitudes corresponding to same frequencies on the transmission characteristic curves of all the channels overlapped, so as to form one continuous curve.
calculate differences between amplitudes corresponding to all the same frequencies on the transmission characteristic curves of the adjacent channels; and
calculate an average value of the differences between the amplitudes corresponding to all the same frequencies, and use the average value as the first distance MovedV.
collect pre-equalization coefficients of the at least two channels in the cable modem; and
obtain the transmission characteristic curves of the channels according to the pre-equalization coefficients of the at least two channels.
obtain line attenuation power according to the transmit power and the receive power corresponding to each of the channels; and
shift upward the transmission characteristic curve of the frequency band in an amplitude direction by a value of the line attenuation power, to obtain the absolute value of the transmission characteristic of the frequency band.
calculate a difference between amplitudes corresponding to a same frequencies on transmission characteristic curves of any two adjacent channels, and use the difference as a first distance MovedV;
fix a transmission characteristic curve of one channel in the any two adjacent channels, and translate a transmission characteristic curve of the other channel in an amplitude direction by the first distance MovedV, to make the amplitudes corresponding to the same frequencies on the transmission characteristic curves of the two adjacent channels overlapped, so as to form a transmission characteristic curve corresponding to a frequency band including the two adjacent channels; and
continue to execute the foregoing steps for the transmission characteristic curve corresponding to the frequency band including the adjacent channels, until transmission characteristic curves corresponding to all channels form one continuous curve.
calculate a difference between amplitudes corresponding to a same frequency on transmission characteristic curves of any two adjacent channels, and use the difference as a first distance MovedV, where a first distance corresponding to a transmission characteristic curve of a jth channel is MovedVj, and j is an integer greater than 1 and less than or equal to N;
calculate a second distance corresponding to a transmission characteristic curve of an ith channel according to the following formula:
where MovedPoweri is the second distance corresponding to the transmission characteristic curve of the ith channel, and i is an integer greater than 1 and less than or equal to N; and
fix a transmission characteristic curve of the first channel, and separately translate transmission characteristic curves of the other channels in an amplitude direction by second distances corresponding to the transmission characteristic curves of the channels, to make amplitudes corresponding to same frequencies on the transmission characteristic curves of the two adjacent channels overlapped, so as to form one continuous curve.
calculate differences between amplitudes corresponding to all the same frequencies on the transmission characteristic curves of the adjacent channels; and
calculate an average value of the differences between the amplitudes corresponding to all the same frequencies, and use the average value as the first distance MovedV.
collect pre-equalization coefficients of the at least two channels in the cable modem; and
obtain the transmission characteristic curves of the channels according to the pre-equalization coefficients of the at least two channels.
obtain line attenuation power according to the transmit power and the receive power corresponding to each of the channels; and
shift upward the transmission characteristic curve of the frequency band in an amplitude direction by a value of the line attenuation power, to obtain the absolute value of the transmission characteristic of the frequency band.
obtaining (201) transmission characteristic curves of at least two channels from a cable modem to a cable modem termination system of a hybrid fiber-coaxial, HFC, network in a channel scanning manner, wherein one characteristic curve reflects amplitudes of one channel at all frequencies, the at least two channels form one contiguous frequency band, and frequencies corresponding to the transmission characteristic curves of the at least two channels have frequency values on a same order of magnitude, and have amplitude values on a same order of magnitude;
translating (202) the transmission characteristic curves of the channels in an amplitude direction, to make amplitudes corresponding to same frequencies on all transmission characteristic curves overlapped, so as to form one continuous curve; and
using (203) the continuous curve as a transmission characteristic curve of the contiguous frequency band;
characterized in that the translating the transmission characteristic curves of the channels in an amplitude direction, to make amplitudes corresponding to same frequencies on all transmission characteristic curves overlapped, so as to form one continuous curve comprises:
calculating differences between amplitudes corresponding to all the same frequencies on transmission characteristic curves of any two adjacent channels;
if the two adjacent channels have only one overlapped frequency, using the difference between amplitudes corresponding to the one overlapped frequency as a first distance MovedV;
if there are multiple same frequencies on the transmission characteristic curves of the two adjacent channels, calculating an average value of the differences between the amplitudes corresponding to all the same frequencies, and using the average value as the first distance MovedV;
fixing a transmission characteristic curve of one channel in the any two adjacent channels, and translating a transmission characteristic curve of the other channel in an amplitude direction by the first distance MovedV, to make the amplitudes corresponding to the same frequency on the transmission characteristic curves of the two adjacent channels overlapped, so as to form a transmission characteristic curve corresponding to a frequency band comprising the two adjacent channels; and
continuing to execute the foregoing steps for the transmission characteristic curve corresponding to the frequency band comprising the adjacent channels, until transmission characteristic curves corresponding to all channels form one continuous curve.
collecting pre-equalization coefficients of the at least two channels of the cable modem of the HFC network; and
obtaining the transmission characteristic curves of the channels according to the pre-equalization coefficients of the at least two channels.
collecting (204) transmit power of the cable modem of the HFC network and receive power of the cable modem termination system of the HFC network that are corresponding to each of the channels;
obtaining (205) line attenuation power according to the transmit power and the receive power corresponding to each of the channels; and
shifting upward (206) the transmission characteristic curve of the frequency band in an amplitude direction by a value of the line attenuation power, to obtain an absolute value of a transmission characteristic of the frequency band.
an obtaining module (701), configured to obtain transmission characteristic curves of at least two channels from a cable modem to a cable modem termination system of a hybrid fiber-coaxial, HFC, network in a channel scanning manner, wherein one characteristic curve reflects amplitudes of one channel at all frequencies, the at least two channels form one contiguous frequency band, and frequencies corresponding to the transmission characteristic curves of the at least two channels have frequency values on a same order of magnitude, and have amplitude values on a same order of magnitude; and
a processing module (702), configured to translate the transmission characteristic curves of the channels in an amplitude direction, to make amplitudes corresponding to same frequencies on all transmission characteristic curves overlapped, so as to form one continuous curve; and use the continuous curve as a transmission characteristic curve of the contiguous frequency band;
characterized in that the processing module (702) is specifically configured to:
calculate differences between amplitudes corresponding to all the same frequencies on transmission characteristic curves of any two adjacent channels;
if the two adjacent channels have only one overlapped frequency, use the difference between amplitudes corresponding to the one overlapped frequency as a first distance MovedV;
if there are multiple same frequencies on the transmission characteristic curves of the at least two adjacent channels, calculate an average value of the differences between the amplitudes corresponding to all the same frequencies, and use the average value as the first distance MovedV;
fix a transmission characteristic curve of one channel in the any two adjacent channels, and translate a transmission characteristic curve of the other channel in an amplitude direction by the first distance MovedV, to make the amplitudes corresponding to the same frequency on the transmission characteristic curves of the two adjacent channels overlapped, so as to form a transmission characteristic curve corresponding to a frequency band comprising the two adjacent channels; and
continue to execute the foregoing steps for the transmission characteristic curve corresponding to the frequency band comprising the adjacent channels, until transmission characteristic curves corresponding to all channels form one continuous curve.
collect pre-equalization coefficients of the at least two channels of the cable modem of the HFC network; and
obtain the transmission characteristic curves of the channels according to the pre-equalization coefficients of the at least two channels.
collect transmit power of the cable modem of the HFC network and receive power of the cable modem termination system of the HFC network that are corresponding to each of the channels; and
the processing module (702) is further configured to:
obtain line attenuation power according to the transmit power and the receive power corresponding to each of the channels; and
shift upward the transmission characteristic curve of the frequency band in an amplitude direction by a value of the line attenuation power, to obtain an absolute value of a transmission characteristic of the frequency band.
an interface circuit (801), configured as the obtaining module (701); and
a processor (802), configured as the processing module (702).
Erfassen (201) von Übertragungsmerkmalskurven von mindestens zwei Kanälen von einem Kabelmodem zu einem Kabelmodemanschlusssystem eines hybriden Faserkoaxialkabel(HFC)-Netzwerks in einer Kanalabtastungsweise, wobei eine Merkmalskurve Amplituden eines Kanals bei allen Frequenzen widerspiegelt, die mindestens zwei Kanäle ein zusammenhängendes Frequenzband bilden und Frequenzen, die den Übertragungsmerkmalskurven der mindestens zwei Kanäle entsprechen, Frequenzwerte in der gleichen Größenordnung aufweisen und Amplitudenwerte in der gleichen Größenordnung aufweisen;
Verschieben (202) der Übertragungsmerkmalskurven der Kanäle in einer Amplitudenrichtung, um Amplituden, die auf allen Übertragungsmerkmalskurven den gleichen Frequenzen entsprechen, überlappen zu lassen, um so eine kontinuierliche Kurve zu bilden; und
Verwenden (203) der kontinuierlichen Kurve als eine Übertragungsmerkmalskurve des benachbarten Frequenzbandes;
dadurch gekennzeichnet, dass das Verschieben der Übertragungsmerkmalskurven der Kanäle in einer Amplitudenrichtung, um Amplituden, die auf allen Übertragungsmerkmalskurven den gleichen Frequenzen entsprechen, überlappen zu lassen, um so eine kontinuierliche Kurve zu bilden, umfasst:
Berechnen von Differenzen zwischen Amplituden, die auf allen Übertragungsmerkmalskurven von zwei beliebigen benachbarten Kanälen den gleichen Frequenzen entsprechen;
wenn die zwei benachbarten Kanäle nur eine überlappende Frequenz aufweisen, Verwenden der Differenz zwischen Amplituden, die der einen überlappten Frequenz entsprechen, als einen ersten Abstand MovedV;
wenn auf den Übertragungsmerkmalskurven der zwei benachbarten Kanäle mehrere gleiche Frequenzen vorhanden sind, Berechnen eines Durchschnittswerts der Differenzen zwischen den Amplituden, die allen den gleichen Frequenzen entsprechen, und Verwenden des Durchschnittswerts als den ersten Abstand MovedV;
Festsetzen einer Übertragungsmerkmalskurve eines Kanals in den beliebigen zwei benachbarten Kanälen und Verschieben einer Übertragungsmerkmalskurve des anderen Kanals in einer Amplitudenrichtung um den ersten Abstand MovedV, um die Amplituden, die auf den Übertragungsmerkmalskurven der zwei benachbarten Kanäle den gleichen Frequenzen entsprechen, überlappen zu lassen, um eine Übertragungsmerkmalskurve zu bilden, die einem Frequenzband entspricht, das die zwei benachbarten Kanäle umfasst; und
Fortsetzen der Ausführung der vorhergehenden Schritte für die Übertragungsmerkmalskurve, die dem Frequenzband entspricht, das die benachbarten Kanäle umfasst, bis die allen Kanälen entsprechenden Übertragungsmerkmalskurven eine kontinuierliche Kurve bilden.
Sammeln von Vorverzerrungskoeffizienten der mindestens zwei Kanäle des Kabelmodems des HFC-Netzwerks; und
Erfassen der Übertragungsmerkmalskurven der Kanäle gemäß den Vorverzerrungskoeffizienten der mindestens zwei Kanäle.
Sammeln (204) der Übertragungsleistung des Kabelmodems des HFC-Netzwerks und der Empfangsleistung des Kabelmodemanschlusssystems des HFC-Netzwerks, die jedem der Kanäle entsprechen;
Erfassen (205) einer Leitungsdämpfungsleistung gemäß der Übertragungsleistung und der Empfangsleistung, die jedem der Kanäle entsprechen; und
Aufwärtsverschieben (206) der Übertragungsmerkmalskurve des Frequenzbandes in einer Amplitudenrichtung um einen Wert der Leitungsdämpfungsleistung, um einen Absolutwert eines Übertragungsmerkmals des Frequenzbandes zu erhalten.
Differenzen zwischen Amplituden zu berechnen, die auf allen Übertragungsmerkmalskurven von zwei beliebigen benachbarten Kanälen den gleichen Frequenzen entsprechen;
wenn die zwei benachbarten Kanäle nur eine überlappende Frequenz aufweisen, die Differenz zwischen Amplituden, die der einen überlappten Frequenz entsprechen, als einen ersten Abstand MovedV zu verwenden;
wenn auf den Übertragungsmerkmalskurven der zwei benachbarten Kanäle mehrere gleiche Frequenzen vorhanden sind, einen Durchschnittswert der Differenzen zwischen den Amplituden zu berechnen, die allen den gleichen Frequenzen entsprechen, und den Durchschnittswert als den ersten Abstand MovedV zu verwenden;
eine Übertragungsmerkmalskurve eines Kanals in den beliebigen zwei benachbarten Kanälen festzusetzen und eine Übertragungsmerkmalskurve des anderen Kanals in einer Amplitudenrichtung um den ersten Abstand MovedV zu verschieben, um die Amplituden, die auf den Übertragungsmerkmalskurven der zwei benachbarten Kanäle den gleichen Frequenzen entsprechen, überlappen zu lassen, um eine Übertragungsmerkmalskurve zu bilden, die einem Frequenzband entspricht, das die zwei benachbarten Kanäle umfasst; und
die Ausführung der vorhergehenden Schritte für die Übertragungsmerkmalskurve fortzusetzen, die dem Frequenzband entspricht, das die benachbarten Kanäle umfasst, bis die allen Kanälen entsprechenden Übertragungsmerkmalskurven eine kontinuierliche Kurve bilden.
die Vorverzerrungskoeffizienten der mindestens zwei Kanäle des Kabelmodems des HFC-Netzwerks zu sammeln; und
die Übertragungsmerkmalskurven der Kanäle gemäß den Vorverzerrungskoeffizienten der mindestens zwei Kanäle zu erfassen.
die Übertragungsleistung des Kabelmodems des HFC-Netzwerks und die Empfangsleistung des Kabelmodemanschlusssystems des HFC-Netzwerks zu sammeln, die jedem der Kanäle entsprechen; und
das Verarbeitungsmodul (702) ferner konfiguriert ist, um:
eine Leitungsdämpfungsleistung gemäß der Übertragungsleistung und der Empfangsleistung zu erfassen, die jedem der Kanäle entsprechen; und
die Übertragungsmerkmalskurve des Frequenzbandes in einer Amplitudenrichtung um einen Wert der Leitungsdämpfungsleistung aufwärts zu verschieben, um einen Absolutwert eines Übertragungsmerkmals des Frequenzbandes zu erfassen.
eine Schnittstellenschaltung (801), die als das Erfassungsmodul (701) konfiguriert ist; und
einen Prozessor (802), der als das Verarbeitungsmodul (702) konfiguriert ist.
l'obtention (201) de courbes caractéristiques de transmission d'au moins deux canaux d'un modem à câble à un système de terminaison de modem à câble d'un réseau hybride fibre-coaxial, HFC, en mode de balayage de canal, dans lequel une courbe caractéristique reflète les amplitudes d'un canal à toutes les fréquences, les au moins deux canaux forment une bande de fréquence contiguë et les fréquences correspondant aux courbes caractéristiques de transmission des au moins deux canaux ont des valeurs de fréquence du même ordre de grandeur et des valeurs d'amplitude du même ordre de grandeur ;
la translation (202) des courbes caractéristiques de transmission des canaux dans une direction de l'amplitude, pour superposer les amplitudes correspondant aux mêmes fréquences sur toutes les courbes caractéristiques de transmission, de manière à former une courbe continue ; et
l'utilisation (203) de la courbe continue en tant que courbe caractéristique de transmission de la bande de fréquences contiguës ;
caractérisé en ce que la translation des courbes caractéristiques de transmission des canaux dans une direction de l'amplitude, pour superposer les amplitudes correspondant aux mêmes fréquences sur toutes les courbes caractéristiques de transmission, de manière à former une courbe continue, comprend :
le calcul des différences entre les amplitudes correspondant à toutes les mêmes fréquences sur les courbes caractéristiques de transmission de deux canaux adjacents quelconques ;
si les deux canaux adjacents n'ont qu'une seule fréquence superposée, l'utilisation de la différence entre les amplitudes correspondant à la fréquence superposée comme première distance MovedV ;
s'il existe plusieurs fréquences égales sur les courbes caractéristiques de transmission des deux canaux adjacents, le calcul d'une valeur moyenne des différences entre les amplitudes correspondant à toutes fréquences égales, et l'utilisation de la valeur moyenne comme première distance MovedV ;
la fixation d'une courbe caractéristique de transmission d'un canal de deux canaux adjacents quelconques, et la translation d'une courbe caractéristique de transmission de l'autre canal dans une direction de l'amplitude de la première distance MovedV, pour superposer les amplitudes correspondant à la même fréquence sur les courbes caractéristiques de transmission des deux canaux adjacents, de manière à former une courbe caractéristique de transmission correspondant à une bande de fréquence comprenant les deux canaux adjacents ; et
la continuation de l'exécution des étapes précédentes pour la courbe caractéristique de transmission correspondant à la bande de fréquences comprenant les canaux adjacents, jusqu'à ce que les courbes caractéristiques de transmission correspondant à tous les canaux forment une courbe continue.
la collecte des coefficients de pré-égalisation des au moins deux canaux du modem à câble du réseau HFC ; et
l'obtention des courbes caractéristiques de transmission des canaux en fonction des coefficients de pré-égalisation des au moins deux canaux.
la collecte (204) de la puissance d'émission du modem à câble du réseau HFC et de la puissance de réception du système de terminaison de modem à câble du réseau HFC qui correspondent à chacun des canaux ;
l'obtention (205) d'une puissance d'atténuation de ligne en fonction de la puissance d'émission et de la puissance de réception correspondant à chacun des canaux ; et
le déplacement vers le haut (206) de la courbe caractéristique de transmission de la bande de fréquence dans une direction d'amplitude d'une valeur de la puissance d'atténuation de ligne, pour obtenir une valeur absolue d'une caractéristique de transmission de la bande de fréquence.
un module d'obtention (701), configuré pour obtenir des courbes caractéristiques de transmission d'au moins deux canaux d'un modem à câble à un système de terminaison de modem à câble d'un réseau hybride fibre-coaxial, HFC, en mode de balayage de canal, dans lequel une courbe caractéristique reflète les amplitudes d'un canal à toutes les fréquences, les au moins deux canaux forment une bande de fréquence contiguë et les fréquences correspondant aux courbes caractéristiques de transmission des au moins deux canaux ont des valeurs de fréquence du même ordre de grandeur et des valeurs d'amplitude du même ordre de grandeur ; et
un module de traitement (702), configuré pour effectuer la translation des courbes caractéristiques de transmission des canaux dans une direction de l'amplitude, de façon à superposer les amplitudes correspondant aux mêmes fréquences sur toutes les courbes caractéristiques de transmission, de manière à former une courbe continue ;
et utiliser la courbe continue comme courbe caractéristique de transmission de la bande de fréquences contiguës ;
caractérisé en ce que le module de traitement (702) est spécifiquement configuré pour :
calculer des différences entre les amplitudes correspondant à toutes les mêmes fréquences sur les courbes caractéristiques de transmission de deux canaux adjacents quelconques ;
si les deux canaux adjacents n'ont qu'une seule fréquence superposée, utiliser la différence entre les amplitudes correspondant à la fréquence superposée comme première distance MovedV ;
s'il existe plusieurs fréquences égales sur les courbes caractéristiques de transmission des deux canaux adjacents, calculer une valeur moyenne des différences entre les amplitudes correspondant à toutes les fréquences égales, et utiliser la valeur moyenne comme première distance MovedV ;
fixer une courbe caractéristique de transmission d'un canal dans deux canaux adjacents quelconques, et effectuer la translation d'une courbe caractéristique de transmission de l'autre canal dans une direction de l'amplitude de la première distance MovedV, pour superposer les amplitudes correspondant à la même fréquence sur les courbes caractéristiques de transmission des deux canaux adjacents, de manière à former une courbe caractéristique de transmission correspondant à une bande de fréquence comprenant les deux canaux adjacents ; et
continuer l'exécution des étapes précédentes pour la courbe caractéristique de transmission correspondant à la bande de fréquences comprenant les canaux adjacents, jusqu'à ce que les courbes caractéristiques de transmission correspondant à tous les canaux forment une courbe continue.
recueillir les coefficients de pré-égalisation des au moins deux canaux du modem à câble du réseau HFC ; et
obtenir les courbes caractéristiques de transmission des canaux en fonction des coefficients de pré-égalisation des au moins deux canaux.
recueillir la puissance d'émission du modem à câble du réseau HFC et la puissance de réception du système de terminaison de modem à câble du réseau HFC qui correspondent à chacun des canaux ; et
dans lequel le module de traitement (702) est en outre configuré pour :
obtenir une puissance d'atténuation de ligne en fonction de la puissance d'émission et de la puissance de réception correspondant à chacun des canaux ; et
déplacer vers le haut la courbe caractéristique de transmission de la bande de fréquence dans une direction d'amplitude d'une valeur de la puissance d'atténuation de ligne, pour obtenir une valeur absolue d'une caractéristique de transmission de la bande de fréquence.
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description