Transmit Power Calibration in FDD Wireless Systems

The patent implements a feedback mechanism where the UE measures its actual transmit power using a power sensor, compares it with the desired power level, and adjusts hardware power settings based on the measured difference. This closed-loop feedback enables the system to maintain accurate transmit power despite rapid changes in transmission bandwidth and frequency, resolving the contradiction between spectral efficiency and power accuracy.

The UE performs self-calibration by autonomously measuring its own transmit power and adjusting its hardware power settings without requiring external calibration signals or network intervention. This self-service approach allows the UE to adapt to changing transmission conditions while maintaining power accuracy, eliminating the need for dedicated calibration resources.

The UE uses its own data transmissions as the calibration signal, measuring the power of its own uplink data signals rather than requiring separate dedicated calibration waveforms. This self-service approach achieves power calibration without consuming additional system resources, as the calibration information is extracted from existing transmissions.

The uplink data transmissions serve dual purposes: conveying user data and providing calibration signals for power measurement. By making the data transmission multi-functional, the system achieves power calibration without requiring separate dedicated resources, eliminating the trade-off between accuracy and resource consumption.