4G-LTE system is a long-term evolution technology proposed by 3GPP. It belongs to quasi-4G technology. It has the features of high rate, wide coverage and low latency. The physical layer is the bottom of the system and the key of technological innovation of mobile communication system. In this paper, some key technologies of the physical layer are studied from the perspective of the physical layer hardware demonstration. The main problems are OFDM synchronization, channel estimation and equalization, multiuser reuse, physical layer algorithm and so on.
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