Envelope Tracking Delay Control for RF Spectral Regrowth
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Solution Overview
Problem
Spectral regrowth in wireless communication systems is challenging to suppress, especially at high transmission power levels, leading to increased interference with adjacent channels, and existing solutions like digital pre-distortion are costly and difficult to implement for high-power or wideband power amplifiers.
Innovation Solution
A wireless communication device with a controller that adjusts the delay of the envelope tracking path to generate asymmetric adjacent channel leakage ratios (ACLR) by using allocation information of resource blocks and ACLR measurement, allowing for effective control of spectral regrowth without requiring high-performance power amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If transmission power is increased, then communication quality is improved, but spectral regrowth increases
Solution Approach 1:
The patent changes the delay parameter of the envelope tracking path to control spectral regrowth. By adjusting the delay value, the system can suppress spectral regrowth while maintaining high transmission power, effectively resolving the contradiction between power output and spectral purity.
Solution Approach 2:
The patent generates asymmetric adjacent channel leakage ratios (ACLR) by adjusting the envelope tracking delay. This asymmetric control allows differential suppression of spectral regrowth in different frequency directions, enabling effective spectral management while maintaining high transmission power.
2Object-generated harmful factors
If a power amplifier that suppresses spectral regrowth is designed, then spectral regrowth is reduced, but device complexity and cost increase
Solution Approach 1:
Instead of designing a complex high-performance power amplifier, the patent uses a simple delay parameter adjustment in the envelope tracking path to suppress spectral regrowth. This approach achieves the same effect with significantly reduced device complexity and cost.
Solution Approach 2:
The patent replaces expensive high-performance power amplifiers with a low-cost delay adjustment mechanism. This simple parameter change provides effective spectral regrowth suppression without requiring costly hardware upgrades.
3Object-generated harmful factors
If a power amplifier that suppresses spectral regrowth is designed, then spectral regrowth is reduced, but manufacturing cost increases
Solution Approach 1:
The patent uses a software-based delay parameter adjustment instead of hardware modifications to suppress spectral regrowth. This approach dramatically reduces manufacturing costs while achieving the desired spectral performance.
Solution Approach 2:
The patent replaces expensive high-performance power amplifiers with a low-cost delay adjustment mechanism, significantly reducing manufacturing costs while maintaining spectral regrowth suppression capability.
4Object-generated harmful factors
If digital pre-distortion is used to suppress spectral regrowth, then spectral regrowth is reduced, but implementation difficulty and cost increase
Solution Approach 1:
The patent replaces complex digital pre-distortion algorithms with a simple delay parameter adjustment in the envelope tracking path. This approach achieves spectral regrowth suppression with minimal implementation difficulty and no additional computational complexity.
Data Source
AI summary
A device for controlling spectral regrowth includes a transmission signal processor configured to generate a baseband transmission signal and a controller. The controller is configured to adjust delay of an envelope tracking path that provides a supply voltage to an envelope tracking power amplifier included in a transmission path that generates a radio frequency (RF) transmission signal from the baseband transmission signal. The controller may obtain allocation information of resource blocks included in the RF transmission signal from the transmission signal processor and may determine the delay of the envelope tracking path based on the allocation information.