关于IS-2000的前向导频信道(F-PICH) 1.我看到的关于IS-2000的资料上写: The F-PICH is equivalent to the IS-95 pilot channel. This channel is identified by Walsh code W-0-128(0是下标,128上标) . It contains no baseband information in that the baseband sequence is a stream of 1s that are spread by Walsh code W-0-128 , which is also a sequence of 1s2. The resulting sequence (still all 1s) is then multiplied by a pair of quadrature PN codes. Thus the forward pilot channel is effectively the PN code itself. As in IS-95, the forward pilot channel provides the mobile with timing and phase reference. Each base station sector has only one forward pilot channel. 这里的意思,PICH是一个连续的1的数据流?而空中接口上写这导频信道是一个连续为0的序列?为什么不同? |