Patent ID: 7961696
Filing Date: 2011-06-14
Classification: H04B,H04L,H04W

Abstract:
1. A method for accessing an orthogonal frequency division multiplexing access (OFDMA) system comprising the steps of: a) constructing at least one OFDMA frame having a first preamble and a second preamble, the first preamble having a common synchronization channel comprising common synchronization subcarriers, the common synchronization subcarriers carrying a common sequence, and the second preamble comprising a base station specific preamble; the first preamble further including other signaling information pertaining to the configuration of the second preamble; b) assigning said first preamble for use in a plurality of base stations; c) transmitting said at least one OFDMA frame by at least one of said plurality of base stations; d) detecting said at least one OFDMA frame at a subscriber station; and e) performing synchronization at said subscriber station by using the common sequence of the first preamble, and identifying candidate timing synchronization positions using a correlation of the common sequence, and searching for the second preamble using the candidate timing synchronization positions.