Segmented Subcarrier Signal Transmission for Extended Sensing Distance
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Solution Overview
Problem
The existing 5G communication systems face limitations in maximum sensing distance due to the cyclic prefix, which does not account for sensing requirements, leading to disrupted frame structures and increased complexity when trying to extend the cyclic prefix.
Innovation Solution
A signal transmission method that separates subcarriers into first-type and second-type sets, where the second-type subcarriers carry a target signal superimposed with a communication signal, allowing flexible extension of cyclic prefixes or suffixes to support various sensing distances while maintaining compatibility with the existing frame structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cyclic prefix is increased to extend maximum sensing distance, then sensing distance is improved, but the frame structure is disrupted and system compatibility is worsened
Solution Approach 1:
The patent segments the frequency domain into two distinct subcarrier sets: first-type subcarriers for communication signals and second-type subcarriers for sensing signals (cyclic prefix extension). This segmentation allows independent optimization of communication and sensing functions without mutual interference, resolving the contradiction between extended sensing distance and frame structure compatibility.
Solution Approach 2:
The patent applies local quality by assigning different functional characteristics to different subcarrier regions. The second-type subcarriers specifically carry extended cyclic prefix sequences for sensing, while first-type subcarriers maintain standard communication signals. This localized functional differentiation enables sensing distance extension in specific frequency regions without disrupting the overall frame structure.
2Length of moving object
If the cyclic prefix is increased to support sensing requirements, then maximum sensing distance is improved, but device complexity is worsened
Solution Approach 1:
The patent divides the cyclic prefix extension into separate second-type subcarriers that carry dedicated sensing sequences. This segmentation allows the system to handle sensing and communication processing separately, reducing overall system complexity compared to a unified approach that would require simultaneous optimization of both functions across all subcarriers.
Solution Approach 2:
The extended cyclic prefix sequences on second-type subcarriers serve dual purposes: they function as sensing signals for distance measurement while simultaneously maintaining the orthogonal frequency-division multiplexing structure required for communication. This multi-functionality reduces the need for separate dedicated sensing hardware or processing paths.
3Length of moving object
If separate sensing and communication signals are transmitted, then sensing distance is improved, but power overhead is worsened
Solution Approach 1:
The patent merges sensing and communication signals into a single OFDM transmission framework by allocating different subcarrier sets for each function. The extended cyclic prefix sequences for sensing and standard modulation signals for communication are combined in the frequency domain and transmitted together through the same physical channel, reducing power overhead compared to separate transmission systems.
Solution Approach 2:
The OFDM signal structure serves universal purposes by simultaneously carrying both communication information on first-type subcarriers and sensing information through extended cyclic prefixes on second-type subcarriers. This multi-functional signal design eliminates the need for separate sensing and communication transmitters, reducing overall power consumption.
Data Source
AI summary
Provided are a signal transmission method, a device, and a storage medium. The signal transmission method applied by a sending end includes determining a first-type subcarrier set and a second-type subcarrier set among transmission symbols, where a second-type subcarrier carries such a generated target signal that a signal on a sample point of a sequence obtained from superposition of a time-domain sequence corresponding to the target signal and a time-domain sequence corresponding to a communication signal carried by a first-type subcarrier satisfies a preset feature; and sending the communication signal and the target signal carried by the transmission symbols to a receiving end.