Radio Access Device Information Sending Method for IoT Signal Reliability
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Solution Overview
Problem
In the context of the Internet of Things, existing radio communications systems face challenges in providing reliable information transmission to a large quantity of low-power sensing devices that are far from radio access devices, resulting in a low signal-to-noise ratio and reduced frequency domain diversity gain.
Innovation Solution
A novel information sending method and apparatus that generates and sends symbol sequences using a higher order modulation scheme across subcarriers with wide spacings, allowing for repeated information transmission and improved transmission performance by utilizing a mixing unit to convert symbol sequences from a first modulation scheme to a second, higher order modulation scheme, and mapping these to resource blocks corresponding to users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensing devices are disposed in a relatively large area far from the radio access device, then the coverage area is expanded, but the signal-to-noise ratio decreases
Solution Approach 1:
The patent combines multiple symbol sequences from different users into a single modulated signal by mapping them to the same time-frequency resource. This merging approach allows the system to serve multiple users simultaneously while maintaining reliable transmission even when users are far from the access device, as the combined signal structure provides inherent diversity and robustness against low signal-to-noise ratio conditions.
2Productivity
If a higher order modulation scheme is used, then the spectral efficiency is improved, but the transmission reliability deteriorates in low signal-to-noise ratio conditions
Solution Approach 1:
The patent segments the transmission by using multiple lower-order modulation schemes (first modulation scheme) for different users, then combines these segmented signals into a higher-order modulation structure (second modulation scheme) for transmission. This segmentation allows each user's signal to maintain the robustness of lower-order modulation while the overall system achieves the spectral efficiency of higher-order modulation through the combined structure.
Solution Approach 2:
The patent creates a composite modulation structure by combining multiple symbol sequences from different users into a unified modulated signal. This composite structure integrates the advantages of multiple lower-order modulations to form a higher-order modulation scheme that achieves both spectral efficiency and transmission reliability, similar to how composite materials combine different materials to achieve superior properties.
3Reliability
If information is repeatedly sent on subcarriers with wide spacings, then the frequency domain diversity gain is obtained, but the resource consumption increases
Solution Approach 1:
The patent makes the time-frequency resource serve multiple functions simultaneously: it carries information for multiple users, provides frequency domain diversity through wide spacing, and achieves spectral efficiency through higher-order modulation. This multi-functionality allows the system to obtain diversity gain without proportionally increasing resource consumption, as the same resource block serves multiple purposes.
Data Source
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AI summary
An information sending method and apparatus, and a radio access device are provided. The information sending method includes: generating, based on N symbol sequences that are in a first modulation scheme and that are respectively corresponding to N users, N symbol sequences that are in a second modulation scheme and that are respectively corresponding to the N users, where N is an integer greater than 1, each symbol sequence in the second modulation scheme includes information about the N symbol sequences in the first modulation scheme, and the second modulation scheme is a higher order modulation scheme than the first modulation scheme; and separately sending the N symbol sequences in the second modulation scheme to the N users by using resource blocks that are respectively corresponding to the N users. The information sending method and apparatus, and the radio access device according to embodiments of the present invention can repeatedly send information for each user on subcarriers that have relatively wide spacings, so that a frequency domain diversity gain can be obtained, and transmission performance for each user can be improved.