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In this paper, we discuss the limitations of phased arrays for 5G massive MIMO systems. The multibeam radiation patterns produced by a full phased array, a phased array with fixed sub-arrays, and a phased array with segmented phased sub-arrays are compared via illustrative examples. In fact, conventional phased array can only improve the link gain or the coverage, but couldn't enhance the capacity...
In this paper, a novel architecture of a digital RF transmitter for the future massive MIMO system is proposed, which features flexible deployment, low cost, small volume and power efficiency. The comparison with a traditional architecture is also provided. To evaluate the feasibility of the proposed architecture, a prototype of one radio channel is implemented. The prototype consists of a BBU (Base...
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