A method for detecting a boundary between two sequences in a wireless local area network is presented that permits rapid detection of the boundary. The method includes provisions for proper operation when significant interference and multi-path can degrade the received transmission significantly. Additionally, when a modification is made to the signaling format to signal a special enhanced mode with performance and features above those that are specified in a single technical standard, the method detects the boundary between sequences regardless of whether they have the standard format or the modified format.