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待解决问题
Sorry, it is not cyclic shift of ZC sequence to differentiate DM-RS, LTE-A use orthogonal cover codes(OCC) to differentiate DM-RS, and no need to inform UE of the precoding matrix info in transmission mode#8/9 since it is non-codebook based precoding and precoding matrix is randomly selected.
If transmission antenna ports >4, the cell specific reference signals(only support 4 antenna ports) are not enough to support DL channel estimation, so CSI Reference signals are introduced in Release10(LTE-Advanced) to support up to max 8 transmission antenna ports.
If transmission antenna ports >4, the cell specific reference signals(only support 4 antenna ports) are not enough to support DL channel estimation, so CSI Reference signals are introduced in Release10(LTE-Advanced) to support up to max 8 transmission antenna ports.
回答时间：2013-4-24 16:12
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