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Abstract: In modern Spread Spectrum (SS) communications, how to generate spread spectrum sequence quickly is important in system modeling and design, and therefore has received wide attentions. Moreover, since ADS (Advanced Design System) software had been a widely used simulation tool in industrial areas and there was only the m-sequence (low linear complexity) in the SS sequence library, this paper investigates the generation of Gordon-Mills-Welch (GMW) sequence (high linear complexity) and designs GMW sequence in ADS software, which will enrich the sequence library of ADS and provide more security in information encryption when engineers design SS systems by ADS. In addition, after analyzing the correlation property, we also study a low-correlation GMW generator based on sequence pair choice. The results show that though original GMW sequences have poor cross-correlation, the latter presents good correlation performance and therefore is beneficial for spread spectrum communications.