DNN-Based Precoding in RIS-Aided mmWave MIMO Systems With Practical Phase Shift
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866909816294735872 |
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| author | Chou, Po-Heng Chen, Ching-Wen Huang, Wan-Jen Saad, Walid Tsao, Yu Chang, Ronald Y. |
| author_facet | Chou, Po-Heng Chen, Ching-Wen Huang, Wan-Jen Saad, Walid Tsao, Yu Chang, Ronald Y. |
| contents | In this paper, the precoding design is investigated for maximizing the throughput of millimeter wave (mmWave) multiple-input multiple-output (MIMO) systems with obstructed direct communication paths. In particular, a reconfigurable intelligent surface (RIS) is employed to enhance MIMO transmissions, considering mmWave characteristics related to line-of-sight (LoS) and multipath effects. The traditional exhaustive search (ES) for optimal codewords in the continuous phase shift is computationally intensive and time-consuming. To reduce computational complexity, permuted discrete Fourier transform (DFT) vectors are used for finding codebook design, incorporating amplitude responses for practical or ideal RIS systems. However, even if the discrete phase shift is adopted in the ES, it results in significant computation and is time-consuming. Instead, the trained deep neural network (DNN) is developed to facilitate faster codeword selection. Simulation results show that the DNN maintains sub-optimal spectral efficiency even as the distance between the end-user and the RIS has variations in the testing phase. These results highlight the potential of DNN in advancing RIS-aided systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_02824 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | DNN-Based Precoding in RIS-Aided mmWave MIMO Systems With Practical Phase Shift Chou, Po-Heng Chen, Ching-Wen Huang, Wan-Jen Saad, Walid Tsao, Yu Chang, Ronald Y. Signal Processing Artificial Intelligence Information Theory Machine Learning Networking and Internet Architecture 68M10, 68M20, 94A20 C.2.1; C.2.5; C.4 In this paper, the precoding design is investigated for maximizing the throughput of millimeter wave (mmWave) multiple-input multiple-output (MIMO) systems with obstructed direct communication paths. In particular, a reconfigurable intelligent surface (RIS) is employed to enhance MIMO transmissions, considering mmWave characteristics related to line-of-sight (LoS) and multipath effects. The traditional exhaustive search (ES) for optimal codewords in the continuous phase shift is computationally intensive and time-consuming. To reduce computational complexity, permuted discrete Fourier transform (DFT) vectors are used for finding codebook design, incorporating amplitude responses for practical or ideal RIS systems. However, even if the discrete phase shift is adopted in the ES, it results in significant computation and is time-consuming. Instead, the trained deep neural network (DNN) is developed to facilitate faster codeword selection. Simulation results show that the DNN maintains sub-optimal spectral efficiency even as the distance between the end-user and the RIS has variations in the testing phase. These results highlight the potential of DNN in advancing RIS-aided systems. |
| title | DNN-Based Precoding in RIS-Aided mmWave MIMO Systems With Practical Phase Shift |
| topic | Signal Processing Artificial Intelligence Information Theory Machine Learning Networking and Internet Architecture 68M10, 68M20, 94A20 C.2.1; C.2.5; C.4 |
| url | https://arxiv.org/abs/2507.02824 |