PSS is a specific physical layer signal that is used for radio frame synchronization. It has characterstics as listed below.
PSS是物理层信号用于无线帧同步，其具有以下特征。
Mapped to 127 active sub carriers around the lower end of the system bandwidth (subcarrier 80~206)
映射到激活的127个子载波，其位于系统带宽的下端（子载波80~206）；
Made up of 127 m-Sequence Values
它由127位的m序列生成；
Used for Downlink Frame Synchronization
用于下行帧同步；
One of the critical factors determining Physical Cell ID
它是组成物理标识PCI主要成分之一；
Comparision to LTE PSS
与LTE中PSS对比
Following is the PSS sequence generation formula for NR PSS and LTE PSS. As you see here, NR PSS is a kind of m-Sequence whereas LTE PSS is a kind of Zadoff-chu sequence.
NR和LTE的PSS生成公式如下图：
NR的PSS是由m序列生成，LTE的PSS是由一种ZC序列生成；
Sequence Generation Algorithm
序列生成算法
NR PSS sequence is generated by the following formula. Unless you are the one who need to implement this, you may not need to understand every details of this formula. But at least it would be good to know of the major factors to determine the sequence. Followings are some highlights about this sequence.
NR中PSS序列是根据如下算法生成；建议了解该算法中的几个主要因素;
The sequence is determined by NID(2) as in LTE.
生成序列的NID(2)与LTE相同
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