梁德群教授提出了非正交多重调制技术（NMT），是一种多载波调制方式，它突破了正交性限制。
Professor Liang Dequn invented non-orthogonal multi-modulation technique (NMT), which is a multi-carrier modulation; it breaks through the orthogonal limitation.
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.
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.
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