码片速率是指用户数据符号经过扩频之后的速率， 从MAC-d传过来的有效fp bit经过channel coding，帧均衡， 速率匹配， 复用到CCTrCH后，分成IQ两路，两路同时分别依次进行扩频和加扰的操作。
扩频信号是一个伪随机代码序列，此码片速率比消息数据速率高若干数量级。
The spreading signal is a pseudo-noise code sequence that has a chip rate which is orders of magnitudes grater than the data rate of the message.
首先对延时相乘信号进行多重自相关处理，在频域可以检测出信号的码片速率、载频。
Firstly, delay-multiply signal can detect the chip rate and the carried frequency in the frequency domain through multi-autocorrelation.
利用降低码片速率有效降低每路信号占有的带宽，将每路信息的比特分配在不同的调制载波上，减少了各路信号间的多址干扰。
Frequency width is compressed by decreasing signature-code speed and using bit-signal modulates by different carrier so as to decrease multi-user interference.
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