36、NR系统中下行物理信号有哪些
A.辅同步信号(Secondary synchronization si gnal, SSS) B.信道状态信息参考信号(Channel -state information reference signal, CSI -RS) C.解调参考信号(Demodulation reference signals, DM-RS) D.相位跟踪参考信号(Phase-tracking reference signals, PT-RS) E.E．主同步信号(Primary synchronization signal, PSS)正确答案ABCDE
