A low computational complexity algorithm, which is based on fast m-sequence transform, is introduced for detection of 3GPP-LTE downlink secondary synchronization channel (S-SCH). The performance of the algorithm is further improved by setting up a flexible threshold to the results of sequence correlation operation and by averaging several downlink S-SCH frames to reduce the noise effect. Results of computer simulation show that the proposed algorithm can achieve a high detection probability even in low SNR.%针对LTE系统下行辅同步序列的特点提出了一种基于快速m序列变换的低复杂度检测算法。通过采取门限检测和对下行辅同步序列进行多帧平均的处理方法来提高检测性能，计算机仿真表明这种低复杂度检测算法在低信噪比条件下仍然具有良好的检测性能。
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