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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.12447 |
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| _version_ | 1866915858588106752 |
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| author | Chou, Tzu-Hsuan Liu, Chih-Hao Jiang, Jing |
| author_facet | Chou, Tzu-Hsuan Liu, Chih-Hao Jiang, Jing |
| contents | Multiple-input multiple-output (MIMO) transceiver design and probabilistic shaping (PS) are key enablers for high spectral efficiency in 6G wireless networks. This work proposes a distribution-aware MIMO transceiver optimized for PS constellation symbols, including a Bayesian geometric-mean decomposition (BGMD) precoder and a maximum a posteriori-VBLAST (MAP-VBLAST) detector. BGMD precoder incorporates PS priors into the derivation and equalizes layer gains to facilitate a single modulation and coding scheme for low-complexity transmissions while preserving channel capacity. MAP-VBLAST leverages these PS priors for optimal MAP detection within a successive interference cancellation (SIC) framework. Furthermore, a new codeword-to-layer mapping scheme, termed layer-contained MIMO (LC-MIMO), is proposed. By containing each codeblock (CB) within a single layer, LC-MIMO enables SIC at CB level, allowing the receiver to exploit the error-correction capability of channel coding to mitigate error propagation. Numerical results show that the BGMD transceiver with LC-MIMO achieves notable performance gains over state-of-the-art methods. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_12447 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Distribution-Aware GMD Transceiver Design for Probabilistic Shaping in MIMO Chou, Tzu-Hsuan Liu, Chih-Hao Jiang, Jing Signal Processing Multiple-input multiple-output (MIMO) transceiver design and probabilistic shaping (PS) are key enablers for high spectral efficiency in 6G wireless networks. This work proposes a distribution-aware MIMO transceiver optimized for PS constellation symbols, including a Bayesian geometric-mean decomposition (BGMD) precoder and a maximum a posteriori-VBLAST (MAP-VBLAST) detector. BGMD precoder incorporates PS priors into the derivation and equalizes layer gains to facilitate a single modulation and coding scheme for low-complexity transmissions while preserving channel capacity. MAP-VBLAST leverages these PS priors for optimal MAP detection within a successive interference cancellation (SIC) framework. Furthermore, a new codeword-to-layer mapping scheme, termed layer-contained MIMO (LC-MIMO), is proposed. By containing each codeblock (CB) within a single layer, LC-MIMO enables SIC at CB level, allowing the receiver to exploit the error-correction capability of channel coding to mitigate error propagation. Numerical results show that the BGMD transceiver with LC-MIMO achieves notable performance gains over state-of-the-art methods. |
| title | Distribution-Aware GMD Transceiver Design for Probabilistic Shaping in MIMO |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2603.12447 |