Patent ID: 7453794
Filing Date: 2008-11-18
Classification: H04L

Abstract:
1. A method of generating a preamble in a Orthogonal Frequency Division Multiplexing (OFDM) communication system, comprises the steps of: Inverse Fast Fourier Transforming (IFFT) polyphase code sequences whose number is the same as half of an IFFT size using Hermitian symmetry; replicating output signals from the transforming step for a predetermined number of times to provide replicated signals; placing the replicated signals in serial; convolving a received signal with a polyphase code sequence which is same as a transmitted polyphase code sequence; and maintaining the convolving step until a predetermined number of peaks equal to the predetermined number are found, wherein a threshold for deciding whether a peak is found is a number which is a magnitude of a first peak times a constant that is a number between 0.7 and 1.0.