对幅频特性和群时延特性进行精细调整。
The amplitude and group delay characteristics can be controlled exactly.
而对相频特性优化的目的是要在通带内获得平坦的群时延特性。
The purpose of optimizing phase response characteristic is to obtain flat group delay characteristic at Pass band.
通过理论推导得出非理想的BPF的群时延特性，对系统输出信号会造成干扰。
The deduced result shows that the non-ideal group delay characteristic of BPF will cause interference on the output signal of the OFDM system.
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