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。
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.
在多径衰落信道下，这些参数是很难获得的。
These parameters are difficult to obtain in multipath fading channels.
在多径衰落信道CD MA系统中，扩频码设计与联合检测为提高系统容量的两个重要手段。
Spreading code design and joint detection are two efficient ways to increase CDMA system capacity in multi-path fading channels.
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