Closed-Loop Power Control for Multi-Band Wireless Systems
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Solution Overview
Problem
Existing power control techniques fail to accurately manage output power in wireless systems with simultaneous transmission in multiple frequency bands, leading to issues with power tolerance and maximum output power capability, especially in systems like inter-band uplink carrier aggregation and dual-SIM dual-active technologies.
Innovation Solution
The implementation of closed loop power control systems that use coupling circuitry, filter circuitry, and power control circuitry to separate and independently control signal components across different frequency bands, allowing for precise adjustment of power levels through input power or bias control, thereby ensuring accurate power measurement and tight power tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional power control techniques are used in multi-transmission systems, then the system can operate in multiple frequency bands, but the power tolerance becomes loose and maximum output power capability cannot be maintained
Solution Approach 1:
The patent segments the total output power control into individual power control loops for each frequency band. Each band has its own power control circuit that independently measures and adjusts power, allowing the system to maintain tight power tolerances in each band while operating across multiple frequency bands simultaneously.
Solution Approach 2:
The patent introduces an intermediary power control circuit between the power amplifier and the output that separately measures and controls the power of each frequency band. This intermediary measurement and control mechanism enables independent power adjustment for each band, resolving the conflict between multi-band operation and power precision.
2Power
If the output power is increased to meet maximum power capability requirements, then the power margin improves, but the linearity performance metrics (ACLR and EVM) degrade when exceeding the maximum linear output power
Solution Approach 1:
The patent implements feedback loops for each frequency band that continuously measure the actual output power and adjust the power control signals accordingly. This feedback mechanism ensures that the total output power across all bands does not exceed the maximum linear output power capability, maintaining ACLR and EVM performance while utilizing the full power capability of the system.
3Adaptability or versatility
If simultaneous transmission in multiple frequency bands is implemented, then the system versatility increases, but the power control accuracy decreases due to interference between bands
Solution Approach 1:
The patent segments the power measurement and control functions into separate circuits for each frequency band. Each power control circuit is dedicated to measuring and controlling the power of a specific band, eliminating measurement interference between bands and maintaining high power measurement accuracy during simultaneous multi-band transmission.
Data Source
AI summary
Techniques for closed loop power control in multi-transmission systems are discussed. One example system employing such techniques can include coupling circuitry configured to receive a transmission path signal comprising a plurality of signal components, wherein the plurality of signal components comprises at least a first signal component in a first frequency band and a second frequency component in a second frequency band distinct from the first frequency band; filter circuitry configured to receive the transmission path signal from the coupling circuitry, to separate the first signal component from the second signal component, and to separately output the first signal component and the second signal component; and power control circuitry configured to receive the first signal component and the second signal component, and to generate a first power control signal based on the first signal component and a second power control signal based on the second signal component.