Nulling Steering Beamforming for Tx-Rx Isolation Optimization in Full-Duplex mMIMO
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Bibliographic record
Abstract
This paper proposes a nulling steering beamforming-based isolation optimization scheme to mitigate the Tx-Rx self-interference in full-duplex massive MIMO systems. By searching the optimal nulling angles in both the uplink and the downlink beamforming process, the simulation and experimental measurements demonstrate a considerable beam-level isolation improvement while maintaining the integrity of the original beamforming performance. Illustrative results with a 20 MHz modulated signal and the 8×8Tx/8×8Rx full-duplex array prototype in the anechoic chamber show an average Tx-Rx isolation improvement of 10.2 dB, resulting in an average Tx-Rx mutual coupling level of -75.7 dB. Within the 25 measured Tx/Rx beam pairs, the most substantial isolation improvement of 22.2 dB can be observed and the best beam-level isolation of 92.7 dB can be achieved.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it