APPARATUS FOR GENERATING PREAMBLE SEQUENCE IN BROADBAND WIRELESS ACCESS COMMUNICATION SYSTEM USING ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SCHEME AND METHOD THEREOF

摘要

A preamble sequence generating apparatus and method in a BWA communication system using OFDM. An ARM code generator generates at least one ARM code of a different length. A sub-carrier selection and frequency mask unit maps a second number of ARM code components to a second number of sub-carriers among a third number of OFDM sub-carriers distributed equally in a frequency band and maps null components to sub-carriers excluding from the second number of sub-carriers. Here, the second number being the number of (the components of the ARM code) minus (a DC component and a first number of ARM code components set to prevent adjacent channel interference). Then, an IFFT generates a preamble sequence by inverse-fast-Fourier-transforming the sub-carriers received from the sub-carrier and frequency mask unit.