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Machine Learning-Inspired Hybrid Precoding for mmWave MU-MIMO Systems with Domestic Switch Network
Content Provider | MDPI |
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Author | Li, Xiang Huang, Yang Heng, Wei Wu, Jing |
Copyright Year | 2021 |
Description | Hybrid precoding is an attractive technique in MU-MIMO systems with significantly reduced hardware costs. However, it still requires a complex analog network to connect the RF chains and antennas. In this paper, we develop a novel hybrid precoding structure for the downlink transmission with a compact RF structure. Specifically, the proposed structure relies on domestic connections instead of global connections to link RF chains and antennas. Fixed-degree phase shifters provide candidate signals, and simple on-off switches are used to route the signal to antennas, thus RF adders are no longer required. Baseband zero forcing and block diagonalization are used to cancel interference for single-antenna and multiple-antenna users, respectively. We formulate how to design the RF precoder by optimizing the probability distribution through cross-entropy minimization which originated in machine learning. To optimize the energy efficiency, we use the fractional programming technique and exploit the Dinkelbach method-based framework to optimize the number of active antennas. Simulation results show that proposed algorithms can yield significant advantages under different configurations. |
Starting Page | 3019 |
e-ISSN | 14248220 |
DOI | 10.3390/s21093019 |
Journal | Sensors |
Issue Number | 9 |
Volume Number | 21 |
Language | English |
Publisher | MDPI |
Publisher Date | 2021-04-25 |
Access Restriction | Open |
Subject Keyword | Sensors Telecommunications Block Diagonalization Cross-entropy Hybrid Precoding Mmwave Mu-mimo |
Content Type | Text |
Resource Type | Article |