其次，本文提出一种针对IEEE 802.20 OFDMA工作模式的下行捕获和同步算法，该算法分为下行帧头检测和扇区标识值识别两个步骤。

Secondly, a novel downlink acquisition and synchronization algorithm for IEEE 802.20 OFDMA system is proposed. The algorithm is composed of downlink frame detection and sector PN code identification.

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其次，提出分层搜索的扇区标识值识别算法，该算法能大大减少检测和识别时间。

Then a hierarchical scan algorithm is proposed to identify the sector PN code, which reduces search time greatly.

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