Digital Sub-Band Receiver Architecture for Orthogonal High Throughput
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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 digital signals to maintain orthogonality between sub-bands without requiring complex hardware.
Innovation Solution
The implementation of digital signal processing using oversampled filter banks, which allows for efficient digital sub-banding by partitioning channels into multiple parallel virtual sub-channels with zero spectral guard-bands, reducing the need for analog components and achieving nearly perfect orthogonality between sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signal processing is implemented to maintain orthogonality between sub-bands, then orthogonality is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the digital signal processing into multiple parallel sub-band processing units. Each sub-band is processed independently through separate filter banks and FFT operations, allowing orthogonality to be maintained in each segment while distributing the overall computational complexity across multiple simpler parallel paths rather than requiring one complex sequential processor
Solution Approach 2:
The patent implements preliminary action through the use of oversampled filter banks that pre-process signals before FFT transformation. By performing preliminary filtering and decimation in the time domain, the system prepares signals in advance to ensure orthogonality is established before frequency domain processing, reducing the need for complex real-time orthogonality maintenance during transmission
2Productivity
If analog sub-band processing is used to enhance throughput, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent applies mechanics substitution by replacing analog/optical domain sub-band processing with digital signal processing. Instead of using complex analog filter banks and optical frequency division multiplexing hardware, the system uses digital filter banks and FFT operations to achieve the same sub-band processing functions, thereby enhancing throughput while reducing hardware complexity
Solution Approach 2:
The patent uses copying by implementing multiple parallel sub-band processing paths that replicate the same processing architecture. Each sub-band has its own dedicated processing chain (filter bank, FFT, modulation), creating identical copies of the processing logic that can be efficiently implemented in digital hardware, achieving high throughput through parallelization rather than complex sequential analog processing
Data Source
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AI summary
Highly efficient digital domain sub-band based receivers and transmitters.