Apparatus and Method for Detecting Frame Boundary in Wireless Communication System

An apparatus for detecting a boundary of a frame in a wireless communication system, the apparatus comprising:

• a preamble correlation energy detector for detecting correlation energy of one or more samples of decimator output signals and at least one predetermined preamble;
• a received signal strength detector for measuring the strength of the decimator output signals in each of the samples;
• an energy comparator/controller for comparing the correlation energy received from the preamble correlation energy detector with the strength of the received signals received from the received signal strength detector, and removing a sample in which the ratio of the correlation energy with respect to the strength of the received signals is smaller than a reference value;
• and
• a classifier for extracting a maximum value from the correlation energy received from the energy comparator/controller, and determining the boundary of a downlink from the frames of the received signals.

A method for detecting a boundary of a frame in a wireless communication system, the method comprising the steps of:

• a) measuring correlation energy of sample signals transmitted from a transmitter and preambles predetermined and used by the system, and measuring strength of the sample signals transmitted from the transmitter;
• b) removing a sample in which a ratio of the correlation energy with respect to the strength of the received signals is smaller than a reference value;
• and
• c) extracting a maximum value from the correlation energy in which the sample has been removed, and determining the boundary of a downlink from the frames of the received signals.