frequency band

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.

于492Q发动机的JCQ净化消声器采稀土小球为催化剂，正交频带加权优化法优选消声器结构参数，得良好的消声、净化性能。

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(OFDM)技术具有抗多径、频带利充分、传输数据率高的优，声通信中具有重要的发展前景。