Transmitter Crest Reduction via Dynamic Peak Limiting
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Solution Overview
Problem
Existing transmitter devices face challenges in reducing crests in transmission signals efficiently, leading to high power consumption and performance issues due to high Peak-to-Average power Ratio (PAR).
Innovation Solution
The proposed solution involves an apparatus with programmable circuitry that stores normalized window waveforms and generates a weight corresponding to signal peaks. This weight is used to produce an output waveform, which is then used to generate a peak limiting waveform (PLW) to reduce the amplitude of signal peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amplitude of the output signal is increased to improve transmission performance, then the transmission distance and reliability are improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamic peak reduction by detecting signal peaks in real-time and applying variable attenuation factors to reduce crests dynamically. The system continuously monitors the signal and adjusts the attenuation applied to different time segments, allowing the transmitter to maintain lower average power consumption while still achieving reliable transmission through intelligent peak management rather than uniform high amplitude transmission.
2Use of energy by moving object
If peak reduction techniques are applied to lower PAR and reduce power consumption, then power efficiency is improved, but signal distortion and quality degradation occur
Solution Approach 1:
The patent implements local quality by applying different attenuation factors to different time segments of the signal based on their specific peak characteristics. Rather than applying uniform reduction, the system analyzes each peak's magnitude and duration, then applies customized attenuation to minimize distortion. This localized approach ensures that only the necessary amount of reduction is applied to each segment, preserving signal quality while achieving overall peak reduction.
Solution Approach 2:
The system employs feedback mechanisms where the processed signal is fed back into the system for continuous monitoring. The feedback loop allows the system to detect residual peaks and adjust attenuation factors accordingly, ensuring that signal quality remains within acceptable thresholds while maximizing power efficiency. This closed-loop control enables precise control over the peak reduction process.
3Use of energy by moving object
If complex peak reduction algorithms are implemented to effectively reduce crests, then PAR is reduced and power consumption decreases, but computational complexity and processing time increase
Solution Approach 1:
The patent divides the signal into multiple time segments and processes each segment independently with customized attenuation factors. This segmentation approach simplifies the overall computational complexity by breaking down the complex peak reduction problem into smaller, manageable sub-problems. Each segment can be processed with appropriate algorithms tailored to its specific characteristics, reducing the computational burden compared to processing the entire signal as a single complex unit.
Data Source
AI summary
An example apparatus to reduce crests in an input signal includes: memory; and programmable circuitry configured to: store a first copy and a second copy of a normalized window waveform in the memory, the first copy of the normalized window waveform including more data points than the second copy of the normalized window waveform; use the second copy of the normalized window waveform to generate a weight corresponding to a peak in the input signal; use the weight and the first copy of the normalized window waveform to generate an output waveform; generate a peak limiting waveform responsive to the output waveform; and combine the peak limiting waveform with the input signal to reduce an amplitude of the peak.