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International Journal of Information and Communication Technology Research (IJICT، جلد ۱۶، شماره ۱، صفحات ۱-۱۰
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عنوان انگلیسی A Dynamic Hybrid Precoding Structure for mmWave Massive MIMO Systems
چکیده انگلیسی مقاله Due to the high-power consumption and complexity of fully digital baseband precoding, its implementation in massive millimeter-wave multiple-input multiple-output (MIMO) systems is not cost-efficient and practical; for this reason, hybrid precoding has attracted a lot of attention in recent years.  Most hybrid precoding techniques concentrate on the fully-connected structure, although they require lots of phase shifters, which is high energy-consuming. On the contrary, the partially-connected structure has low power consumption, nevertheless, suffers from a severe decrease in spectral efficiency (SE). To enhance SE, this paper proposed a dynamic hybrid precoding structure where a switch network is able to provide dynamic connections from phase shifters to radio frequency (RF) chains. To determine the digital precoder and the states of switch, a novel alternating minimization algorithm is proposed, which leverages closed-form solutions at each iteration to efficiently converge to an optimal solution. Furthermore, the phase shifter matrix is optimized through an iterative solution. The simulation results show that in terms of SE, the proposed algorithm with a dynamic structure achieves higher performance than the partial structure. Also, since the proposed structure reduces the number of phase shifters, it can guarantee better energy efficiency (EE) than the fully connected structure.
کلیدواژه‌های انگلیسی مقاله Massive MIMO, Spectral efficiency, Hybrid precoding, mmWave communication, Energy efficiency
نویسندگان مقاله | Amirreza Moradi
Department of Electrical Engineering K. N. Toosi University of Technology Tehran, Iran


| Kamal Mohamed-pour
Department of Electrical Engineering K. N. Toosi University of Technology Tehran, Iran


| Nasim Jafari Farsani
Department of Electrical Engineering K. N. Toosi University of Technology Tehran, Iran
نشانی اینترنتی http://ijict.itrc.ac.ir/browse.php?a_code=A-10-4419-1&slc_lang=en&sid=1
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