SSB Introduction (PbCH and DMRs need to be supplemented)

NR SSB By the main synchronization sequence , Secondary synchronization sequence , The physical broadcast channel and the demodulation reference signal together constitute , That is to say PSS,SSS,PBCH,DMRS In four consecutive OFDM Symbol .

pss The role of ：

ue Search for pss Then make sure OFDM The starting position of the symbol , To determine the SS/PBCH Sub carrier spacing of the block , Realization OFDM Time synchronization of symbols and SS/PBDH Block synchronization , Determine by blind selection N_(2)ID. Generate PSS The formula of the signal is as follows , It can be seen that it is a pseudo-random sequence , With autocorrelation ,
ue The only thing I don't know is N(2)ID, There are only three cases 0,1,2,ue Directly generate three kinds of local sequence correlation , You can know by judging the peak N(2)_ID Value .

SSS About

according to PSS You can push out the position of SSS The location of , It can be determined by blind examination N_(1)_ID. The formula of the agreement is as follows , It is also a pseudo-random sequence , Methods and methods of blind inspection PSS The signal is the same .

according to pss and sss Find out pci

The formula is as follows ：ue know N_(1)_ID( adopt sss obtain ) and N(2)_ID( adopt pss obtain ) You can push it out PCI Value .

pbch and dmrs Need to be further supplemented