2023 Fiscal Year Research-status Report
Cooperative Beam Management for Cell-Free Multi-Layer Heterogeneous Network
| Project/Area Number |
23K16870
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| Research Institution | Nara Institute of Science and Technology |
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Principal Investigator |
Chen Na 奈良先端科学技術大学院大学, 先端科学技術研究科, 助教 (80838342)
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| Project Period (FY) |
2023-04-01 – 2026-03-31
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| Keywords | Beam Management / Deep Learning / Massive MIMO / IRS |
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| Outline of Annual Research Achievements |
This research focus on deep learning based heterogeneous network (HetNet) beam management. We aim at developing a deep learning empowered cooperative beam management scheme for the RIS and radio-over-fiber (RoF) and intelligent reflecting surface (IRS) assisted cell-free (CF) HetNet system. We also aim at carrying out a hardware demo with campus local 5G experiment network to confirm the model performance. Comparing with existing study, this is a comprehensive study on deep learning model design for complex communication system beam cooperation with demo implementation, which is of high importance for 5G/6G systems. We mainly did the following study in the past year:
1. We developed deep learning schemes for massive multiple-input multiple-output (mMIMO) beam training. Specifically, we introduced contrastive learning mechanism with Transformer model for reducing the training overhead and improve model efficiency.
2. We developed deep learning algorithms for IRS-assisted mMIMO communication. Specifically, we considered a practical semi-passive IRS design to collect the channel information. Then we designed hybrid convolutional neural network (CNN) encoder-based Transformer deep learning model for IRS beam selection. The model achieved high prediction performance and spectral efficiency.
3. We implemented some hardware demo for RIS. We designed LC-based IRS structure and mushroom style patch design for IRS. Besides, we measured the local 5G channel character and radio-over-fiber channel character.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Based on the theoretic analysis of the IRS-assisted mMIMO system and algorithm simulation, we designed multiple effective deep learning models achieving high beam management accuracy and spectrum efficiency improvement for massive MIMO and IRS-assisted systems. More general distributed deep learning model design considering CF access is under process.
For hardware demo, we purchased RoF devices and improved demo system scale. We simulated the IRS hardware design with simulation. We also made some basic IRS hardware models and measured the reflection performance.
Overall, the research is progressing smoothly.
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| Strategy for Future Research Activity |
In the next step, we will continue with the following 3 aspects:
1. We will continue with the RoF nonlinear character analysis. Specifically, cooperational effect of the multiple RoF links.
2. Based on the study on modeling the CF-IRS network, we will publish journal and conference papers. Specifically, we will discuss how to reduce the training overhead and de-centralized cooperation among network devices.
3. We will accomplish international cooperation and domestic cooperation with the hardware implementation of IRS and design our apporach with deep learning algorithm loaded. We plan to apply for patents about the new IRS model with deep learning algorithm design.
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| Causes of Carryover |
With the previous research achievements, we will develop the reconfigurable IRS and the controlling board in the next year. So we will spend more on the hardware. Meanwhile, we will develop international cooperation to discuss the optimization of hardware and effective control of the IRS element coefficient. We will spend some budget on the communication with international experts, such as inviting researchers for lecture, organizing and participating activities.
For larger scale distributed learning algorithm, we will also spend the budget to improve the computing ability of the deep learning server.
We will also spend the budget for paper publication, conference paper presentation, and patent application.
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