Wireless Communication Apparatus Modulation Diversity Switching
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Solution Overview
Problem
Conventional radio communication systems experience a decrease in error correction performance when the channel environment is poor, leading to low reception SNR, due to modulation diversity processing on transmission data.
Innovation Solution
A radio communication apparatus that determines whether to generate a transmission signal from a modulated signal or a signal modulated using a modulation diversity technique based on the channel environment, optimizing the modulation scheme to maintain high error correction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If modulation diversity processing is performed on transmission data in poor channel environments, then communication robustness is improved, but error correction performance deteriorates
Solution Approach 1:
The patent implements dynamic switching between modulation diversity processing and conventional modulation based on channel quality feedback. The determination section dynamically selects the appropriate processing mode by comparing channel quality metrics against thresholds, allowing the system to adapt its error correction strategy in real-time according to environmental conditions
Solution Approach 2:
The patent changes the processing parameter (modulation diversity application) based on channel quality conditions. In good channel environments, modulation diversity is applied to improve robustness, while in poor environments, conventional modulation is maintained to preserve error correction performance, thus optimizing the parameter selection according to operational conditions
2Reliability
If modulation diversity technique is used to improve communication quality, then resistance to multipath and fading is enhanced, but reception quality deteriorates in poor channel environments
Solution Approach 1:
The system dynamically adjusts the modulation processing approach based on real-time channel quality assessments. When channel quality is good, modulation diversity is activated to provide multipath and fading resistance. When channel quality deteriorates, the system switches to conventional modulation to maintain reception quality, creating a dynamic adaptation mechanism
3Reliability
If transmission signal is always generated using modulation diversity technique, then communication robustness is improved, but transmission rate decreases
Solution Approach 1:
The patent optimizes the transmission rate by changing the processing parameter (modulation diversity application) based on channel conditions. In good channel environments where high data rates are achievable, conventional modulation is used to maximize transmission rate. In poor environments, modulation diversity is applied to maintain communication robustness, thus optimizing the parameter selection to balance rate and reliability
Data Source
AI summary
A wireless communication apparatus capable of suppressing the reduction in the error correction ability in the wireless communication apparatus at the receiving end even when the propagation path environment is bad and hence the reception quality of received signals is low. This apparatus comprises a turbo encoding part (111) for performing an error correction encoding of transport data; a modulating part (113) for modulating the transport data as error correction coded to generate a modulated signal; a modulation diversity modulating part (120) for generating a modulation diversity modulated signal from the modulated signal; an S/P part (133) for generating a transport signal from one of the modulated signal and the modulation diversity modulated signal; and a deciding part (112) for deciding, in accordance with the propagation path environment of the transport signal as wireless transmitted, from which the transport signal is generated by the S/P part (133), the modulated signal or the modulation diversity modulated signal.