Convolutional Modulation for Low PAPR in Wireless Signals
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Solution Overview
Problem
Current wireless communication technologies face challenges in reducing Peak Average Power Ratio (PAPR) in high-frequency scenarios, particularly in 5G and future generations, which affects signal-to-noise ratio and power consumption, especially in massive Machine Type Communication scenarios where low PAPR is necessary for extended battery life and improved transmission quality.
Innovation Solution
The technique involves using a convolutional modulation scheme with a three-coefficient function and inserting zero coefficients between the input sequence coefficients to generate an intermediate sequence, followed by a multipath delay operation, which reduces PAPR by ensuring equal modulus values and small phase differences between data elements, thereby improving signal-to-noise ratio and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional modulation schemes are used in high-frequency wireless communication, then transmission capacity and connectivity are improved, but Peak Average Power Ratio (PAPR) increases leading to degraded signal-to-noise ratio and reduced power amplifier efficiency
Solution Approach 1:
The patent segments the input sequence by inserting zero coefficients between adjacent coefficients, creating an intermediate sequence with separated elements. This segmentation allows subsequent multipath delay operations to be applied independently to different segments, reducing peak power values while maintaining overall transmission capacity.
Solution Approach 2:
The patent applies dynamic multipath delay operations where delay values are selectively applied to different segments of the sequence. By dynamically adjusting delay values and combining multiple delayed versions with appropriate weighting, the system adapts to reduce PAPR in real-time while preserving signal integrity and transmission capacity.
2Reliability
If conventional modulation schemes are used to maintain transmission quality, then connectivity is improved, but power consumption increases due to high PAPR
Solution Approach 1:
The patent changes key parameters of the modulation scheme by inserting zero coefficients and applying multipath delay operations with specific weighting factors. These parameter changes transform the signal characteristics to achieve lower PAPR, which directly improves power amplifier efficiency and reduces power consumption while maintaining transmission quality.
3Loss of energy
If zero coefficients are inserted between input sequence coefficients to reduce PAPR, then power amplifier efficiency is improved, but sequence length increases
Solution Approach 1:
The patent performs preliminary zero-coefficient insertion and multipath delay operations at the transmitter before transmission. This preliminary processing reduces PAPR in advance, ensuring that the power amplifier operates more efficiently throughout the transmission without requiring additional power correction mechanisms during reception.
Data Source
AI summary
Methods, apparatus, and systems for reducing Peak Average Power Ratio (PAPR) in signal transmissions are described. In one example aspect, a wireless communication method includes determining, for an input sequence of coefficients, an output sequence and generating a waveform using the output sequence. The output sequence corresponds to an output of a convolutional modulation between a three-coefficient function associated with22,1, and22and an intermediate sequence. The intermediate sequence is generated by inserting zero coefficients between coefficients of the input sequence of coefficients.