OFDM-UWB MIMO transceiver implementation in realistic fading channels
Bibliographic record
Abstract
This paper proposes the implementation of an Orthogonal Frequency-Division Multiplexing (OFDM) Ultra-wideband (UWB) multiple-input multiple-output (MIMO) transceiver employing a novel design of Wave-Radio Interferometer (WRI) circuit as a direct down-converter. In order to investigate the performance of the system in a realistic environment, the transceiver is simulated and tested in laboratory using an UWB fading channel defined by the IEEE802.15.3a standard set for high-rate wireless-personal area networks (WPANs). According to these standard specifications, a MATLAB code has been used to generate the channel model for simulations. The same code representing the channel impulse response has been imported to a radio channel emulator to imitate the wireless channel behavior for the laboratory measurements. For the proposed transceiver operating in the frequency range (3.1-4.1GHz), single-input multiple-output (SIMO) and MIMO configurations have been considered. A comparative study between standard channel models (CM) 1 and 4 is presented for each scenario. The results demonstrate a significant performance enhancement when an extra branch is used at the receiver of the SIMO, MIMO systems. This is due to the advantage of added diversity obtained in multiple-output systems.
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How this classification was reachedexpand
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 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".