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Wireless spread spectrum technologies are widely used in the implementation of WLAN physical layer. Bits error rate (BER) and bandwidth efficiency are the two most important aspects we concern. In this paper, we propose a high efficiency spread spectrum modulation technology based on the definition of non-strictly orthogonal sequences (NS-OS). Simulation shows that the proposed scheme has a better performance than the traditional technologies do under AWGN channel, and a parameter q defined in this scheme could be tuned to balance BER performance and bandwidth efficiency according to different applications.