Single-Input Single-Output Digital Predistortion of Multi-user RF Beamforming Arrays
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Bibliographic record
Abstract
We investigate the application of single-input single-output (SISO) digital predistortion (DPD) to mitigate the nonlinearity in millimeter-wave multi-user RF beamforming arrays. In principle, SISO DPD may not be sufficient to linearize such arrays as a multiple-input one may be required due to coupling between the sub-array antennas. Nevertheless, in practice, the coupling between antennas of different sub-arrays may be much smaller than the coupling between antennas of the same sub-array. It is first shown mathematically that if the coupling between sub-arrays is small, then SISO DPD is sufficient to linearize such arrays. This is then confirmed in practice by linearizing two co-located 64-element sub-arrays driven by 800 MHz modulated signals at 28 GHz. Using four sets of SISO DPD coefficients, the EVM and ACPR were improved from as much as 8% and 30 dBc to better than 2% and 40 dBc, respectively, across all steering angle combinations of the two sub-arrays.
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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