Modulation Switching by Power Amplifier Region in Wireless Links
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Solution Overview
Problem
Conventional wireless communication technologies lack the ability to effectively switch between multi-level modulation schemes based on transmission power, leading to inconsistent communication quality due to the power amplifier operating in either linear or nonlinear regions, which affects the suitability of QAM and APSK modulation.
Innovation Solution
A wireless communication method and system that dynamically switches between QAM and APSK modulation schemes based on signal-to-noise ratio (SNR) requirements and predicted SNR degradation, using a power amplifier with varying transmission power to ensure optimal communication quality across a wide power range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless communication system is introduced to allow mobile stations to access the network, then network accessibility and communication flexibility are improved, but the risk of malicious stations performing denial-of-service attacks increases
Solution Approach 1:
The patent introduces a base station as an intermediary that verifies the legitimacy of mobile stations before allowing network access. The base station receives connection requests, validates authentication information, and controls resource allocation, thereby preventing malicious stations from directly attacking the network core while maintaining open access for legitimate users.
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors communication patterns, validates authentication responses, and dynamically adjusts resource allocation based on station legitimacy. This continuous verification process enables the system to identify and block denial-of-service attacks while maintaining normal communication flows.
2Productivity
If resource allocation is dynamically adjusted based on channel quality, then communication efficiency is improved, but the complexity of resource management increases
Solution Approach 1:
The patent implements dynamic resource allocation where the base station adjusts uplink and downlink resource blocks based on real-time channel quality indicators. The system continuously monitors channel conditions and reallocates resources between mobile stations and services, optimizing communication efficiency while the base station centralizes the complexity of management decisions.
Solution Approach 2:
The resource management system is segmented into distinct functional modules: channel quality measurement, resource allocation decision-making, and resource assignment execution. This segmentation allows the complex resource management task to be broken down into manageable components, reducing overall system complexity while maintaining dynamic optimization capabilities.
3Reliability
If authentication verification is performed for each connection request, then system security is improved, but the processing time and computational load increase
Solution Approach 1:
The patent implements preliminary authentication where mobile stations provide authentication information in advance during the connection request phase. The base station verifies this pre-submitted authentication data before allocating resources, enabling security verification to occur parallel to resource setup processes rather than sequentially, thereby reducing overall connection establishment time.
Data Source
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AI summary
A wireless transmission device 10 and a wireless reception device that support QAM and APSK are used. The wireless transmission device 10 includes a power amplifier 26 that varies transmission power. An SNR degradation amount calculation unit 22 calculates an SNR degradation amount {QAM} caused by QAM and an SNR degradation amount {APSK} caused by APSK on the basis of input/output characteristics of the power amplifier 26 acquired from an input/output characteristic storage unit 30, a QAM modulated signal acquired from a QAM modulation unit 16, an APSK modulated signal acquired from an APSK modulation unit 18, and the transmission power of the power amplifier 26. A modulation scheme selection unit 20 acquires a required SNR {QAM} of QAM and a required SNR {APSK} of APSK from a required SNR storage unit 24, compares "required SNR {QAM} + SNR degradation amount {QAM}" with "required SNR {APSK} + SNR degradation amount {APSK}", and selects the modulation scheme with the smaller value.