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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/2604.02498 |
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| _version_ | 1866915911873593344 |
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| author | Kim, Yongjun Dhananjay, Aditya Rangan, Sundeep Shetty, Sachin Barati, C. Nicolas Zappe, Michael Gold, Kimberly Choi, Junil |
| author_facet | Kim, Yongjun Dhananjay, Aditya Rangan, Sundeep Shetty, Sachin Barati, C. Nicolas Zappe, Michael Gold, Kimberly Choi, Junil |
| contents | Null forming is increasingly essential in modern wireless systems for spectrum-sharing, anti-jamming, and covert communications in contested and congested environments. Achieving deep nulls, however, is far more demanding than conventional beam steering: nulls are intrinsically narrow, and even small phase, timing, or gain mismatches across RF chains can significantly degrade suppression. This work develops and validates a self-calibrating SDR architecture tailored for high-fidelity null forming using a compact reference transmitter directionally coupled to the antenna feeds. We demonstrate the effectiveness of the approach through simulation and experimental measurements on an SDR platform operating from 3.0 to 3.5GHz, a band of growing importance for Department of Defense spectrum-sharing initiatives. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02498 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Self-Calibrating SDR for High Fidelity Beam- and Null-forming Arrays Kim, Yongjun Dhananjay, Aditya Rangan, Sundeep Shetty, Sachin Barati, C. Nicolas Zappe, Michael Gold, Kimberly Choi, Junil Signal Processing Null forming is increasingly essential in modern wireless systems for spectrum-sharing, anti-jamming, and covert communications in contested and congested environments. Achieving deep nulls, however, is far more demanding than conventional beam steering: nulls are intrinsically narrow, and even small phase, timing, or gain mismatches across RF chains can significantly degrade suppression. This work develops and validates a self-calibrating SDR architecture tailored for high-fidelity null forming using a compact reference transmitter directionally coupled to the antenna feeds. We demonstrate the effectiveness of the approach through simulation and experimental measurements on an SDR platform operating from 3.0 to 3.5GHz, a band of growing importance for Department of Defense spectrum-sharing initiatives. |
| title | A Self-Calibrating SDR for High Fidelity Beam- and Null-forming Arrays |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2604.02498 |