频带

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净化器采用稀土小球为催化剂，用正带加权优化法优选器结构参数，取得良好、净化性。

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.

摘要正复用(OFDM)技术具有抗多径、带利用充、传输数据率高优点，在水通信中具有重要发展前景。