a method for detecting a preamble location in a multiple preamble ofdm system is disclosed . an ofdm signal is generated with a plurality of frames , and each of the frames includes symbols and a predetermined preamble symbol . a maximum fddc value is computed for each of the symbols in some of the frames . the preamble location in a frame is determined by summing the maximum fddc value for each symbol at a same frame location in consecutive frames of the ofdm signal .