Crest Factor Reduction Circuit Frequency Arrangement Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wireless communication systems face challenges in autonomously setting the crest factor reduction (CFR) circuit to optimal settings when the frequency arrangement of synthesized time signals changes, leading to deterioration of communication quality such as error vector magnitude (EVM) due to excessive peak suppression in non-contiguous frequency arrangements.
Innovation Solution
Incorporating a frequency arrangement determination unit and a CFR control unit that determine the frequency arrangement of synthesized time signals and control the CFR circuit accordingly, adjusting the CFR filter passband and reducing the number or amplitude of CFR iterations based on the frequency interval between component carriers to maintain optimal peak suppression and communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the CFR circuit performs strong peak suppression to improve ACLR/EVM, then communication quality improves, but excessive peak suppression causes loss of synthesized time signals and deteriorates EVM in non-contiguous frequency arrangements
Solution Approach 1:
The CFR circuit dynamically adjusts its operation based on frequency arrangement detection. The system transitions from fixed strong peak suppression to adaptive suppression levels, where the CFR is activated or deactivated, and its suppression strength is modulated according to whether component carriers are contiguous or non-contiguous, preventing EVM deterioration while maintaining ACLR improvement
Solution Approach 2:
The system changes key parameters of the CFR circuit based on frequency arrangement. When non-contiguous frequency arrangements are detected, the CFR threshold is adjusted, the number of CFR iterations is reduced, and the correction amplitude is modified. These parameter changes prevent excessive peak suppression that would otherwise cause synthesized time signal loss and EVM deterioration
2Reliability
If the CFR circuit uses fixed strong peak suppression settings, then ACLR improves, but the system cannot autonomously adapt to frequency arrangement changes, leading to EVM deterioration
Solution Approach 1:
The system performs self-diagnosis and self-adjustment through automatic frequency arrangement detection. The base station autonomously determines whether component carriers are contiguous or non-contiguous and automatically configures the CFR circuit accordingly, eliminating the need for manual intervention or external configuration while maintaining optimal performance across different frequency arrangements
Solution Approach 2:
The system implements a feedback mechanism where the detected frequency arrangement information is used to control the CFR circuit operation. The detection result feeds back to adjust the CFR threshold, iteration count, and correction amplitude, creating a closed-loop system that adapts to frequency arrangement changes while maintaining both ACLR and EVM performance
3Reliability
If the CFR circuit performs multiple iterations with high correction amplitude, then peak suppression effectiveness increases, but communication quality deteriorates due to excessive synthesized time signal loss
Solution Approach 1:
The system applies partial CFR action by dynamically adjusting the number of iterations and correction amplitude based on frequency arrangement. Instead of always applying full-strength CFR, the system uses only the necessary amount of peak suppression required for each scenario, avoiding excessive correction that would cause synthesized time signal loss and EVM deterioration while still achieving sufficient peak suppression for ACLR improvement
Data Source
AI summary
A wireless communication apparatus according to the present disclosure includes: a crest factor reduction (CFR) circuit; a digital pre-distortion (DPD) circuit; at least one memory configured to store instructions; and at least one processor configured to execute the instructions to determine frequency arrangement of a synthesized time signal of a plurality of component carriers (CCs) acquired by synthesizing time signals of each of the plurality of CCs being input to the CFR circuit, and control the CFR circuit, based on the determined frequency arrangement of the synthesized time signal of the plurality of CCs.