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当前学科：LTE认证考试
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（CRS）用于下行信道估计及非beamforming模式下的解调、调度上下行资源及切换测量；（DRS）仅用于波束赋型模式，用于UE解调；（DMRS）用于上行控制和数据信道的相关解调；（）用于估计上行信道域信息，做频率选择性调度。
A . DMRS，
B . DRS，
C . SRS，
D . CRS.
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