Look-up table-based digital predistorter implementation for field programmable gate arrays using long-term evolution signals with 60 MHz bandwidth
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Bibliographic record
Abstract
This study discusses the implementation of a digital predistorter to linearise radiofrequency (RF) power amplifiers, using input signals 60 MHz in bandwidth. The digital predistorter characterisation procedure is performed on a digital signal processor, using a memory polynomial modelling technique with QR-based recursive least squares (QR-RLS) as the extraction procedure. A multiple look-up table design for the memory polynomial predistorter is introduced, and by using fixed-point operations, reduces the processing latency considerably when compared with a floating-point-based predistorter implementation on a field programmable gate array (FPGA). Linearisation results are shown for a laterally diffused metal oxide semi-conductor (LDMOS)-based power amplifier (PA) biased in class AB operation with a three-carrier long-term evolution-time division duplex (LTE-TDD) input signal. Combining both the optimised predistortion coefficient extraction and predistorter implementation gives up to 20 dBc improvement in the adjacent channel and meets the wireless communication standard requirements.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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