A method of generating a forward link frame in an OFDM cellular wireless communication system in which a plurality of cells are grouped into a plurality of cell groups, and each cell group includes at least two cells, the forward link frame comprising subframes, each subframe comprising a plurality of OFDM symbols in a time domain, the method comprising: generating first (100-A) and second (100-B) primary synchronization channels that are respectively mapped to OFDM symbols of the forward link frame, wherein the first and second primary synchronization channel comprise the same synchronization sequence; generating first (101-A) and second (101-B) secondary synchronization channels, the first secondary synchronization channel including a first sequence and the second secondary synchronization channel including a second sequence; and generating the forward link frame using the primary synchronization channels and the secondary synchronization channels, wherein the first sequence is different from the second sequence, wherein the first sequence and the second sequence have the same length that is a number of sub-carriers assigned to a secondary sync channel symbol, wherein the first sequence and the second sequence correspond to a scrambling code group number k from among a set of sequences defined by a total number of scrambling code groups, wherein an information about a number of antennas applied to a broadcasting channel, BCH, is modulated to the first and second sequence, wherein the last two OFDM symbols in a subframe are a secondary synchronization channel and a primary synchronization channel symbol, and wherein the first primary synchronization channel and the first secondary synchronization channel are formed based on a time division multiplexing and placed adjacent to each other in the frame, and the second primary synchronization channel and the second secondary synchronization channel are formed based on time division multiplexing and placed adjacent to each other in the frame. generating first (100-A) and second (100-B) primary synchronization channels that are respectively mapped to OFDM symbols of the forward link frame, wherein the first and second primary synchronization channel comprise the same synchronization sequence; generating first (101-A) and second (101-B) secondary synchronization channels, the first secondary synchronization channel including a first sequence and the second secondary synchronization channel including a second sequence; and generating the forward link frame using the primary synchronization channels and the secondary synchronization channels, wherein the first sequence is different from the second sequence, wherein the first sequence and the second sequence have the same length that is a number of sub-carriers assigned to a secondary sync channel symbol, wherein the first sequence and the second sequence correspond to a scrambling code group number k from among a set of sequences defined by a total number of scrambling code groups, wherein an information about a number of antennas applied to a broadcasting channel, BCH, is modulated to the first and second sequence, wherein the last two OFDM symbols in a subframe are a secondary synchronization channel and a primary synchronization channel symbol, and wherein the first primary synchronization channel and the first secondary synchronization channel are formed based on a time division multiplexing and placed adjacent to each other in the frame, and the second primary synchronization channel and the second secondary synchronization channel are formed based on time division multiplexing and placed adjacent to each other in the frame.