Radio Communication System Adaptive Clipping Rate Spectrum Shaping
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Solution Overview
Problem
Adaptive coding modulation schemes in radio communication systems face instability in transmission rate, especially when propagation paths are poor, and multiplexing signals from multiple devices can lead to incomplete inter-user interference and reduced detection accuracy.
Innovation Solution
A radio communication system that includes transmission devices and reception devices capable of adaptively controlling the clipping rate in spectrum shaping based on propagation path characteristics, using feedback from the reception device to optimize spectrum allocation and error correction coding, thereby ensuring stable transmission rates and minimizing inter-user interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive coding modulation schemes are used to adjust transmission rate according to propagation path conditions, then transmission reliability is improved, but transmission rate stability deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of clipping rate based on propagation path conditions through feedback mechanisms. The reception device measures propagation path characteristics and feeds back clipping rate control information to the transmission device, which then adaptively changes the clipping rate. This dynamic control allows the system to maintain stable transmission rates while adapting to varying channel conditions, resolving the contradiction between reliability improvement and rate stability.
2Use of energy by moving object
If spectrum shaping with clipping is applied to maximize energy transmission, then energy transmission efficiency is improved, but transmission rate stability deteriorates due to propagation path variations
Solution Approach 1:
The patent employs a feedback mechanism where the reception device measures propagation path characteristics and determines appropriate clipping rate control information, which is then fed back to the transmission device. This closed-loop control allows the system to maintain optimal energy transmission efficiency while adapting to propagation path variations, thereby preserving transmission rate stability. The feedback loop continuously adjusts the clipping rate to match current channel conditions.
3Use of energy by moving object
If multiple transmission devices perform spectrum shaping independently, then individual device energy efficiency is improved, but inter-user interference increases reducing detection accuracy
Solution Approach 1:
The patent changes the control parameter from fixed clipping rate to adaptively controlled clipping rate based on propagation path characteristics. By adjusting the clipping rate parameter according to measured channel conditions and feedback information, the system optimizes energy transmission for each device while accounting for inter-user interference effects, thereby maintaining both individual device efficiency and overall detection accuracy.
Data Source
AI summary
A clipping rate is controlled in spectrum shaping according to a propagation path to thereby improve transmission characteristics and perform communication at a stable transmission rate.Propagation path characteristics are detected by a propagation path information detection unit 5 for detecting propagation path information fed back from a base station device and a water filling principle for distributing energy by a primary spectrum shaping unit 6 according to the propagation path characteristics is applied to transmission spectrum obtained by a DFT unit 4. Clipping information in secondary spectrum shaping fed back from the base station device is detected by a clipping information detection unit 7 to perform the secondary spectrum shaping by a secondary spectrum shaping unit 8. At this time, with the clipping rate by the secondary spectrum shaping unit 8, clipping rates of all transmission devices multiplexed in a scheduling unit 26 of the base station device are controlled adaptively.