Chirp Modulation Frequency Control for IoT Interference Suppression
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Solution Overview
Problem
In wireless communication systems for IoT, as the number of sensor terminals increases, interference between signals narrows the time or frequency interval, leading to incorrect demodulation of frames and decreased reception performance, especially in license-free frequency bands where interference is common.
Innovation Solution
Implementing a transmission and reception system that sets different frequency changes for chirp modulation for each type of information frame, such as using down chirp for control frames and up chirp for data frames, or varying chirp rates, to minimize interference and maintain reception quality even when frames share wireless resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of sensor terminals increases, then the wireless communication system can serve more devices, but interference between signals increases and reception performance deteriorates
Solution Approach 1:
The patent applies local quality by assigning different chirp modulation characteristics (different frequency change rates) to different types of signals (control frames vs. data frames). This allows the system to optimize reception performance for each signal type locally, enabling more sensor terminals to coexist while maintaining reliable communication through differentiated signal characteristics.
2Productivity
If the time or frequency interval between signals is narrowed to accommodate more terminals, then system capacity increases, but interference affects the entire frame and demodulation becomes incorrect
Solution Approach 1:
The patent changes the parameter of chirp modulation frequency change rate to differentiate between control frames and data frames. By using different frequency change rates, the system can narrow time and frequency intervals to accommodate more terminals while maintaining demodulation accuracy, as receivers can distinguish between signal types through their unique frequency characteristics.
3Object-affected harmful factors
If chirp modulation is used to resist interference between wireless communication systems, then interference resistance improves, but interference between different signal types in the same frame increases
Solution Approach 1:
The patent introduces asymmetry by using different chirp modulation characteristics for different signal types (control frames use one frequency change rate, data frames use another). This asymmetric differentiation allows the system to maintain interference resistance from external wireless communication systems while preventing interference between different signal types, as receivers can distinguish signal types through their asymmetric frequency characteristics.
Data Source
AI summary
The present technology relates to a transmission device and method as well as a reception device and method which can suppress the influence of interference. The transmission device sets different methods of changing the frequency of the chirp modulation for each of first information and second information different from the first information. The transmission device transmits the chirp-modulated first information or second information in accordance with the set frequency change method. The present technology can be applied to a wireless communication system.