Phase-Coded Signal Transmission for Low Peak-to-Average Ratio
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Solution Overview
Problem
The current application of space-time wave packet signals is limited, particularly in microwave and millimeter-wave frequency bands, where the high peak-to-average ratio of these signals hinders efficient signal transmission due to the need for superimposing multiple subcarriers, leading to inefficient power amplifier utilization and reduced signal-to-noise ratio in long-distance wireless communication.
Innovation Solution
A signal transmission method involving a transmitter with multiple transmitting units, where each unit corresponds to multiple subcarriers, modulates signals based on specific phases and frequencies, reducing peak-to-average ratio by ensuring spatiotemporal coupling, and a receiver that determines symbols based on signal strength and position to parse the transmitted information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If space-time wave packet signals are generated by superimposing modulated signals of multiple subcarriers in microwave or millimeter-wave frequency bands, then the non-diffracting characteristic is achieved, but the peak-to-average ratio becomes high
Solution Approach 1:
The patent applies parameter changes by modifying the phase distribution across subcarriers. Specifically, it introduces a phase rotation parameter θ that varies with subcarrier index, transforming the signal construction from simple superposition to phase-coded superposition. This parameter change enables control over the peak-to-average ratio while preserving the non-diffracting characteristic through adjusted phase relationships.
2Stability of the object's composition
If the peak amplitude of superimposed space-time wave packet signal is large, then the non-diffracting characteristic is maintained, but the power amplifier utilization becomes inefficient
Solution Approach 1:
The patent changes the phase parameter θ of each subcarrier to control the constructive and destructive interference patterns. By optimizing these phase parameters, the signal achieves non-diffracting propagation with reduced peak amplitudes, allowing power amplifiers to operate more efficiently in their linear region without requiring excessive back-off, thus improving overall utilization efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces the peak-to-average ratio of space-time wave packet signals, maintaining their non-diffracting characteristics while improving spectral efficiency and signal processing flexibility, enabling more efficient long-distance wireless communication.
Implementation Method 1
a phase of the modulated signal is determined based on a first phase and a second phase. The first phase is obtained based on a distance between the target transmitting unit and a reference position and a frequency of the subcarrier... the first phase satisfies a spatiotemporal coupling relationship
Data Source
AI summary
Embodiments of this application provide a signal transmission method and an apparatus. The method is applied to a transmitter including a plurality of transmitting units, and one transmitting unit corresponds to a plurality of subcarriers. The method includes: obtaining an information source bit sequence, and generating at least one symbol based on the information source bit sequence; modulating each subcarrier of a target transmitting unit based on the at least one symbol, to obtain a modulated signal corresponding to each subcarrier, where the target transmitting unit is included in the plurality of transmitting units, a phase of the modulated signal is determined based on a first phase and a second phase.