CARRIER SENSE DEVICE IN DATA COMMUNICATION

摘要

PURPOSE: A carrier sense device in data communication is provided to detect correctly a start point and an end point of a received frame signal by considering a threshold value aspects of time and power. CONSTITUTION: A carrier sense device includes a power conversion portion(21), a power accumulation portion(22), a power threshold value comparison portion(23), and a time threshold value comparison portion(24). The power conversion portion converts a voltage value of an input signal to a power value. The power accumulation portion accumulates the converted power value as much as a predetermined window block. The power threshold value comparison portion compares a power accumulation value of the power accumulation portion with the predetermined threshold value and outputs a compared value. The time threshold value comparison portion counts an outputting period at which the same result value from the power threshold value comparison portion is outputted and compares the counted value with the predetermined threshold value.