Receiver and method of receiving
First Claim
1. A receiver for receiving payload data from a downstream signal, the receiver comprising:
- an analogue receiving filter configured to receive the downstream signal representing the payload data, the downstream signal including physical layer signaling data identifying downstream communications resources which represent the payload data;
an analogue to digital converter configured to receive the downstream signal from the analogue receiving filter and to convert the downstream signal into a sampled digital form in accordance with a sampling rate which is matched to a bandwidth of the analogue receiving filter;
a demodulator configured to demodulate the digital form of the downstream signal to recover the payload data and the physical layer signaling data, the physical layer signaling data including a mode switch signal to indicate whether the receiver should switch from one of an active mode or a sleep mode to the other of the active mode and the sleep mode; and
a controller configured to detect the mode switch signal and in response to the mode switch signal to control the analogue to digital converter to switch from a first sampling rate to a second sampling rate, and to control the analogue receiving filter to switch from a first frequency band to a second frequency band, wherein the first frequency band serves to perform anti-alias filtering in respect of the first sampling rate, and the second frequency band serves to perform anti-alias filtering in respect of the second sampling rate, only the physical layer signaling data being encompassed in the second frequency band.
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Accused Products
Abstract
A receiver receives payload data from a downstream signal, and includes a filter to receive the downstream signal, and including signalling data identifying downstream resources for the payload data, and an analog to digital converter to receive the downstream signal from the filter and to convert it into a sampled digital form. A demodulator demodulates the digital form of the downstream signal to recover the payload data and the signalling data. The signalling data includes a mode switch signal to indicate an active mode or a sleep mode for the receiver. A controller detects the mode switch signal to control the analog to digital converter to switch sampling rates in response thereto, and to control the filter to switch frequency bands. The frequency bands perform anti-alias filtering for respective sampling rates.
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Citations
19 Claims
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1. A receiver for receiving payload data from a downstream signal, the receiver comprising:
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an analogue receiving filter configured to receive the downstream signal representing the payload data, the downstream signal including physical layer signaling data identifying downstream communications resources which represent the payload data; an analogue to digital converter configured to receive the downstream signal from the analogue receiving filter and to convert the downstream signal into a sampled digital form in accordance with a sampling rate which is matched to a bandwidth of the analogue receiving filter; a demodulator configured to demodulate the digital form of the downstream signal to recover the payload data and the physical layer signaling data, the physical layer signaling data including a mode switch signal to indicate whether the receiver should switch from one of an active mode or a sleep mode to the other of the active mode and the sleep mode; and a controller configured to detect the mode switch signal and in response to the mode switch signal to control the analogue to digital converter to switch from a first sampling rate to a second sampling rate, and to control the analogue receiving filter to switch from a first frequency band to a second frequency band, wherein the first frequency band serves to perform anti-alias filtering in respect of the first sampling rate, and the second frequency band serves to perform anti-alias filtering in respect of the second sampling rate, only the physical layer signaling data being encompassed in the second frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of receiving payload data from a downstream signal, the method comprising
filtering the downstream signal with an analogue receiving filter, the downstream signal representing the payload data, the downstream signal including physical layer signaling data identifying downstream communications resources which represent the payload data; -
analogue to digital converting the downstream signal received from the analogue receiving filter, to convert the downstream signal into a sampled digital form in accordance with a sampling rate which is matched to a bandwidth of the analogue receiving filter; demodulating the digital form of the downstream signal to recover the payload data and the physical layer signaling data; detecting a mode switch signal in the physical layer signaling data, the mode switch signal indicating whether the receiver should switch from one of an active mode or a sleep mode to the other of the active mode and the sleep mode; in response to the mode switch signal controlling the analogue to digital converter to switch from a first sampling rate to a second sampling rate; and controlling the analogue receiving filter to switch from a first frequency band to a second frequency band, wherein the first frequency band serves to perform anti-alias filtering in respect of the first sampling rate, and the second frequency band serves to perform anti-alias filtering in respect of the second sampling rate, only the physical layer signaling data being encompassed in the second frequency band. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A cable modem for receiving payload data from a downstream signal from a cable modem termination system, the receiver comprising
an analogue receiving filter configured to receive the downstream signal representing the payload data, and including physical layer signaling identifying downstream communications resources which represent the payload data in the downstream signal; -
an analogue to digital converter configured to receive the downstream signal from the analogue receiving filter and to convert the downstream signal into a sampled digital form in accordance with a sampling rate determined by a receiver clock; an demodulator configured to demodulate the digital form of the downstream signal to recover the payload data and the physical layer signaling data, wherein the physical layer signaling includes a mode switch signal to indicate whether the receiver should switch from one of an active mode or a sleep mode to the other of the active mode and the sleep mode, and a controller configured to detect the mode switch signal and in response to the mode switch signal to control the analogue to digital converter to switch from a first clock frequency to a second clock frequency, and to control the analogue receiving filter to switch from a first frequency band to a second frequency band, only the physical layer signaling data.
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Specification