Splitting Precoding with Subspace Selection and Quantized Refinement for Massive MIMO
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| Format: | Preprint |
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2026
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| _version_ | 1866915704443240448 |
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| author | Khorsandmanesh, Yasaman Bjornson, Emil Jalden, Joakim |
| author_facet | Khorsandmanesh, Yasaman Bjornson, Emil Jalden, Joakim |
| contents | Limited fronthaul capacity is a practical bottleneck in massive multiple-input multiple-output (MIMO) 5G architectures, where a base station (BS) consists of an advanced antenna system (AAS) connected to a baseband unit (BBU). Conventional downlink designs place the entire precoding computation at the BBU and transmit a high-dimensional precoding matrix over the fronthaul, resulting in substantial quantization losses and signaling overhead. This letter proposes a splitting precoding architecture that separates the design between the AAS and BBU. The AAS performs a local subspace selection to reduce the channel dimensionality, while the BBU computes an optimized quantized refinement precoding based on the resulting effective channel. The numerical results show that the proposed splitting precoding strategy achieves higher sum spectral efficiency than conventional one-stage precoding. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00616 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Splitting Precoding with Subspace Selection and Quantized Refinement for Massive MIMO Khorsandmanesh, Yasaman Bjornson, Emil Jalden, Joakim Signal Processing Hardware Architecture Limited fronthaul capacity is a practical bottleneck in massive multiple-input multiple-output (MIMO) 5G architectures, where a base station (BS) consists of an advanced antenna system (AAS) connected to a baseband unit (BBU). Conventional downlink designs place the entire precoding computation at the BBU and transmit a high-dimensional precoding matrix over the fronthaul, resulting in substantial quantization losses and signaling overhead. This letter proposes a splitting precoding architecture that separates the design between the AAS and BBU. The AAS performs a local subspace selection to reduce the channel dimensionality, while the BBU computes an optimized quantized refinement precoding based on the resulting effective channel. The numerical results show that the proposed splitting precoding strategy achieves higher sum spectral efficiency than conventional one-stage precoding. |
| title | Splitting Precoding with Subspace Selection and Quantized Refinement for Massive MIMO |
| topic | Signal Processing Hardware Architecture |
| url | https://arxiv.org/abs/2601.00616 |