Digital Sub-Band Transceiver Using Oversampled Uniform Filter Banks
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Solution Overview
Problem
Current optical and wireless receivers and transmitters face challenges in achieving high throughput with low complexity, particularly in efficiently processing and transmitting data across multiple sub-bands without spectral guard-bands, which leads to inter-sub-band crosstalk and increased computational complexity.
Innovation Solution
The implementation of digital signal processing using oversampled filter banks, specifically uniform filter banks, to break down digital processing into multiple parallel virtual sub-channels, allowing for efficient digital sub-banding without spectral guard-bands, thereby maintaining orthogonality between sub-bands and reducing hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If digital signal processing uses oversampled filter banks to break down processing into multiple parallel virtual sub-channels, then throughput is improved and computational complexity is reduced, but hardware requirements increase
Solution Approach 1:
The patent divides the digital signal processing into multiple parallel virtual sub-channels using oversampled filter banks. Each sub-channel processes a specific frequency band independently, enabling parallel processing that increases throughput while managing computational complexity through structured decomposition of the signal processing task.
2Productivity
If spectral guard-bands are eliminated to increase spectral efficiency, then spectral efficiency is improved, but inter-sub-band crosstalk increases
Solution Approach 1:
The patent converts the potential harm of inter-sub-band crosstalk into a benefit by using the oversampling structure to deliberately introduce controlled redundancy. This redundancy allows the system to tolerate and even exploit the crosstalk, eliminating the need for spectral guard-bands while maintaining signal integrity through the mathematical properties of the oversampled filter bank.
3Manufacturing precision
If uniform filter banks are used to achieve digital sub-banding without spectral guard-bands, then orthogonality between sub-bands is improved, but device complexity increases
Solution Approach 1:
The patent achieves near-perfect orthogonality between sub-bands by carefully selecting and adjusting parameters of the uniform filter bank, specifically the oversampling ratio and filter design parameters. These parameter changes enable the system to maintain orthogonality without requiring spectral guard-bands, balancing precision with manageable complexity.
Data Source
AI summary
Highly efficient digital domain sub-band based receivers and transmitters.