Patent ID: 7924801

Claim:
An apparatus for detecting a packet in a Wireless Local Area Network (WLAN) based on Orthogonal Frequency Division Multiplexing (OFDM), the apparatus comprising: an autocorrelation average power calculation means for calculating an absolute value of an autocorrelation average power value obtained by delaying a preamble signal of a received signal by half of a preamble length, wherein the preamble signal is configured to have at least 2 or more samples, and wherein the delay of half of the preamble length is configure to be applied immediately after receiving a first sample of the preamble signal from the received signal; an average power calculation means for calculating an average power value of the received signal; a power ratio calculation means for calculating a ratio of the average power value calculated by the average power calculation means to the absolute value of the average power value calculated by the autocorrelation average power calculation means; and a packet detection means for detecting the packet by using the power ratio calculated by the power ratio calculation means.