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http://dx.doi.org/10.6109/jkiice.2021.25.2.274

Hybrid Precoder Design for Massive MIMO Systems with OSA structure  

Seo, Bangwon (Dept. of Electrical, Electronics and Control Engineering, the Institute of IT Convergence Technology (IITC), Kongju National University)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.25, no.2, 2021 , pp. 274-279 More about this Journal
Abstract
Since conventional massive antenna systems require too many RF chains, they have disadvantages of high implementation cost and complexity. To overcome this problem, hybrid precoding schemes have been proposed. But, they are still of high implementation cost and complexity because RF chains are connected to all antenna elements. In this paper, we consider massive MIMO systems with overlapped sub-array (OSA) structure and then, propose a hybrid precoding scheme. In the overlapped subarray structure, RF analog precoding matrix has a sparse structure where many elements of RF analog precoding matrix are zeros. Using this sparse property, we propose a GTP-based precoder design method for RF and baseband digital precoding. Through simulation, we show that the proposed scheme has more than 85% of the spectral efficiency of the fully-connected structure while having 20~30% of complexity of it.
Keywords
Massive MIMO; Precoder design; Hybrid precoder; Spectral efficiency;
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