Erasure Based PAPR Reduction Using Minimally Expanded Constellations in OFDM Systems
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Bibliographic record
Abstract
This paper develops a new method for peak-to- average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems using an expanded constellation of points in quadrature amplitude modulation (QAM). On each OFDM subcarrier, the scheme uses a specialized representation of QAM symbols that allows mapping of a group of symbols from the conventional constellation onto an alternative symbol from the external square of signalling points. The design of the expanded constellation maintains the minimum distance between signalling points with a minimal increase in the average power. Its advantage stems from the location of the alternative signalling point being "radially symmetric" to the group of original signalling points in QAM. In systems using coding, the alternative signalling points represent recoverable erasures introduced at the transmitter for the purpose of reducing PAPR. The proposed PAPR reduction method is especially applicable to QAM schemes with high number of constellation points such as M = 64 and M = 256. Significant PAPR reduction is achieved by careful mapping and selection of alternative signalling points for transmission that result in lower PAPRs. Specifically, the complementary cumulative distribution function (CCDF) of the modified OFDM signal shows (5) dB improvement in PAPR at a clipping probability of 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-4</sup> over the original OFDM signal.
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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 | 0.000 |
| 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)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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