OFDM系统对子载波间的正交性要求极其严格，因此对滤波器群延时较敏感。
The OFDM system is very strict in orthogonality of sub-carries, thus it is extremely sensitive to the filter group delay.
分析了将智能算法应用到信号设计中的可行性，并将蚁群算法运用到正交多相编码信号的设计中，对设计的多相码进行了分析研究。
Analyze the feasibility of applying intelligent algorithms to the signal design and design orthogonal polyphase coded signals using the ant colony algorithm.
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