Multi-Band Crest Factor Reduction With Balanced Clipping Noise
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Solution Overview
Problem
Current radio frequency units face challenges in efficiently processing signals across multiple frequency bands, leading to increased signal processing effort and potential noise imbalance between bands, which affects transmission efficiency and hardware resource utilization.
Innovation Solution
The proposed solution involves an apparatus and method that obtain and process multiple radio signals, determine envelope signals, and apply crest factor reduction techniques using common and band-specific clipping gain signals, optimized by weighing factors to balance noise distribution across bands, thereby reducing the peak-to-average power ratio and enhancing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate clipping noise handling is applied to each band, then band-specific noise optimization is achieved, but device complexity and processing effort increase
Solution Approach 1:
The patent combines the clipping noise handling for multiple bands by determining a common clipping gain signal based on a preview envelope signal that represents the combined envelope of all bands. This merging approach balances clipping noise across bands while avoiding the complexity of completely separate processing for each band, as the common clipping gain signal is then distributed to individual bands with appropriate weighting factors.
2Productivity
If crest factor reduction is applied to multiple radio signals, then transmission efficiency is improved, but signal processing effort increases
Solution Approach 1:
The patent merges the crest factor reduction processing for multiple radio signals by determining a single common clipping gain signal from a combined preview envelope signal. This approach maintains transmission efficiency through effective crest factor reduction while significantly reducing processing time compared to handling each signal separately, as the computationally intensive envelope analysis and clipping gain determination is performed once for the combined signal rather than repeatedly for each individual signal.
3Ease of manufacture
If hardware resources are efficiently utilized through software algorithms, then cost is reduced, but processing complexity increases
Solution Approach 1:
The patent implements a universal software-based crest factor reduction apparatus that can handle multiple radio signals across different frequency bands using a common processing framework. The apparatus determines envelope signals, combines them into a preview envelope signal, and generates a common clipping gain signal that serves all bands simultaneously. This multi-functional approach reduces hardware costs by avoiding dedicated processing chains for each band while managing software complexity through systematic reuse of processing components.
Data Source
AI summary
A method comprising: obtaining a first radio signal and a second radio signal, determining a first envelope signal based on the first radio signal and a second envelope signal based on the second radio signal, determining a preview envelope signal based on the first envelope signal and the second envelope signal, determining a common clipping gain signal based on the preview envelope signal, determining a first clipping gain signal based on the common clipping gain signal and a first weighing factor, determining a second clipping gain signal based on the common clipping gain signal and a second weighing factor, performing a first crest factor reduction for the first radio signal utilizing the first clipping gain signal, and performing a second crest factor reduction for the second radio signal utilizing the second clipping gain signal.