CENTER CONTROL UNIT AND BLOCK CODE LENGTH CONTROL METHOD FOR CABLE MODEM TRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a cable modem transmission system providing efficient communication by monitoring an uplink noise level and changing a block code length for error correction depending on a noise occurrence state.

SOLUTION: An uplink signal reception section of a center control unit of the system monitors a noise level in an uplink frequency band in operation and calculates an error rate of uplink data for a prescribed time block at the same time. When the noise level or the error rate indicates a prescribed change, the error correction strength is calculated and an optimum block code length is calculated on the basis of the error correction strength. Then a cable modem is notified to perform coding by the calculated block code length.

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