The orthogonality, however, is impaired by multipath fading channels, thus causing multicode interference (MCI) and deteriorating the system's performance at high data transmission rates.

但是这种正交性却被多径衰落信道破坏，产生了多码道干扰，严重影响了系统高速传输数据的性能。

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In modern shortwave communication systems, the channels are mostly frequency-selective, multipath transmission causes the coherent attenuation and symbol interference.

现代短波通信系统，其信道大多数具有频率的选择性，多径传输产生了信号的相干衰落与符号干扰。

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Cooperative diversity technology can overcome the multipath fading and improve the effectiveness of system transmission.

协作分集技术能够克服多径衰落，有效的改善系统传输的可靠性。

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