frequency band

OFDM (Orthogonal Frequency Division Multiplexing) is a method that can combat multipaths, fully use the frequency band and has high data rate, and has a promising future in UWA communication.

摘要正交频分复用(OFDM)技术具有抗多径、频带利用充分、传输数据率高，在水声通信中具有重要发展前景。

JCQ depurant-muffler is adopted on 49ZQ engine using small rare-earth element balls as catalyst and took the method of quadrature frequency band optimization to opetmize the configuration parameters.

用于492Q发动机JCQ声器采用稀土小球为催剂，用正交频带加权法选声器结构参数，取得良好声、性能。