Patent ID: 8331395
Filing Date: 2012-12-11
Classification: H04B,H04L

Abstract:
1. A communication apparatus which performs a carrier detection for a frame, the frame including a first preamble signal and a second preamble signal, and is connected to a transmission line, the communication apparatus comprising: a carrier detecting unit which detects the first preamble signal and the second preamble signal for the carrier detection in the frame respectively; a comparing unit which provides a comparison result based on comparison of a carrier detecting result of the first preamble signal with a carrier detecting result of the second preamble signal; and a control unit which controls a symbol length of the first preamble signal based upon the comparison result obtained by the comparing unit, wherein: the symbol length of the first preamble signal is shorter than a symbol length of the second preamble signal, and the first preamble signal is placed prior to the second preamble signal in a preamble field.