RECEIVER AND METHOD OF RECEIVING

摘要

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 analogue 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 analogue 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.

主权项

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, and including physical layer signalling 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 signalling data, wherein the physical layer signalling data 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 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.