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WCDMA下行链路具体是怎样加扰的？
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提问者：ACEyiduqiang
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提问时间：2017-6-22 10:18
根据协议3GPP TS 25.213可知，下行链路中P-CCPCH与P-CPICH都是利用主扰码进行加扰，并且是各自加扰之后进行信道合并（这是我看协议得到的结论，如有不同的见解可以相互交流）。但是P-CCPCH在每个时隙中只发送2304个码片。疑问点有两点（1）协议上有这么一段话
In case of P-CCPCH, the scrambling code shall be applied aligned with the P-CCPCH frame boundary, i.e. the first complex chip of the spread P-CCPCH frame is multiplied with chip number zero of the scrambling code. In case of other downlink channels, the scrambling code shall be applied aligned with the scrambling code applied to the P‑CCPCH. In this case, the scrambling code is thus not necessarily applied aligned with the frame boundary of the physical channel to be scrambled. 这句话如何理解？P-CCPCH帧边界指的是哪里（P-CCPCH每个时隙中前256个码片不传送）？其他信道进行加扰的起始点与P-CCPCH一致又是如何理解？
（2）下行扰码的长度为38400，但是P-CCPCH每个时隙只有2304个码片，根本用不了38400个扰码序列值，是按顺序依次使用，然后对于剩下的扰码序列值摈弃不用么？
In case of P-CCPCH, the scrambling code shall be applied aligned with the P-CCPCH frame boundary, i.e. the first complex chip of the spread P-CCPCH frame is multiplied with chip number zero of the scrambling code. In case of other downlink channels, the scrambling code shall be applied aligned with the scrambling code applied to the P‑CCPCH. In this case, the scrambling code is thus not necessarily applied aligned with the frame boundary of the physical channel to be scrambled. 这句话如何理解？P-CCPCH帧边界指的是哪里（P-CCPCH每个时隙中前256个码片不传送）？其他信道进行加扰的起始点与P-CCPCH一致又是如何理解？
（2）下行扰码的长度为38400，但是P-CCPCH每个时隙只有2304个码片，根本用不了38400个扰码序列值，是按顺序依次使用，然后对于剩下的扰码序列值摈弃不用么？
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