Carrier sense apparatus for data communication

Abstract

Disclosed is a carrier sense (CS) apparatus for data communication. The carrier sense apparatus for data communication detects a start time point and an end time point of a reception frame using a power threshold value and a time threshold value of a preset signal to recognize a length of the reception frame at a modem receiver for data communication. The apparatus includes a power converter for converting a voltage value of an input signal into a power value; a power accumulator for accumulating the power value for a prescribed window interval; a power threshold comparator for comparing an accumulated power value generated from the power accumulator with a predetermined power threshold value, and generating the result value; and a time threshold comparator for counting a predetermined time for which the result value generated from the power threshold comparator is continuously maintained, and determining whether the counted time exceeds a predetermined time threshold value. Therefore, the apparatus considers a threshold value in view of two aspects being time and power, and effectively detects accurate start and end time points of a reception frame under a poor channel environment without increasing the load on hardware.

Dependencies are inferred from the claim text.