Dynamic PAPR Control in OFDM Transceivers
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Solution Overview
Problem
Existing OFDM systems face challenges in controlling peak-to-average power ratio (PAPR), leading to non-linear distortion and degraded performance, particularly in varying receiving environments, where lowering PAPR improves power efficiency but compromises receiving performance.
Innovation Solution
A data transmission apparatus and method that includes a symbol mapper, normalizing and real signal converter, angle modulation unit, and PAPR control unit, allowing for dynamic adjustment of the sine component's gain to normalize power and control PAPR according to the receiving environment, enabling PAPR to be set to 0 dB in VLC and increased in optical communication for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If PAPR is lowered to improve power efficiency and reduce non-linear distortion, then power efficiency is improved, but receiving performance is deteriorated
Solution Approach 1:
The patent applies dynamics by making the PAPR control mechanism adjustable rather than fixed. The apparatus dynamically adapts the PAPR reduction level based on real-time channel conditions and receiving environment, allowing the system to optimize between power efficiency and receiving performance for each specific operating condition.
Solution Approach 2:
The patent changes the parameter of PAPR control by introducing an adjustable control mechanism that can vary the degree of PAPR reduction. Instead of a fixed PAPR reduction approach, the system modifies the control parameter based on channel characteristics, enabling optimal performance across different receiving environments while maintaining power efficiency benefits.
2Ease of manufacture
If fixed PAPR control method is used, then implementation is simple, but system performance cannot be optimized for varying receiving environments
Solution Approach 1:
The patent transitions from a static PAPR control approach to a dynamic one by incorporating real-time channel condition monitoring and adaptive control. The apparatus adjusts PAPR control parameters based on current receiving environment, maintaining implementation simplicity while significantly improving adaptability to varying conditions.
Solution Approach 2:
The patent introduces feedback mechanisms where the apparatus monitors channel conditions and receiving environment in real-time, then uses this information to adjust PAPR control parameters. This feedback loop enables the system to optimize performance for varying receiving environments while keeping the control logic straightforward and implementable.
Data Source
AI summary
A data transmitting apparatus generates a plurality of modulation data symbols by symbol-mapping a plurality of input data signals, converts the plurality of modulation data symbols to a real signal of a time domain from a frequency domain, performs angle modulation of the signal, and controls and transmits the size of a sine signal of the angle-modulated real signal with a gain varying according to a control signal.