Frequency-Domain MIMO-FIR Filtering With Reduced Block Overlap
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Solution Overview
Problem
The frequency domain MIMO-FIR type signal processing in existing technologies experiences discrete increases in block and tap lengths, leading to inconsistent parameter settings and reduced calculation efficiency in long-distance optical fiber communication systems.
Innovation Solution
A signal processing device and method that adjusts the overlap ratio by storing and discarding specific symbols in the output signal sequence, reducing the overlap ratio and optimizing the number of output symbols per block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the block length and tap length are increased to maintain consistent parameter settings in frequency domain MIMO-FIR signal processing, then the processing accuracy is improved, but the calculation amount increases
Solution Approach 1:
The patent extracts and processes only the necessary portion of output symbols (N/2 symbols) from the inverse Fourier transform result, discarding the redundant half. This extraction approach maintains processing accuracy for the required symbols while reducing the calculation amount by avoiding processing of unnecessary symbols.
Solution Approach 2:
The patent performs inverse Fourier transform on the entire block of N symbols but only utilizes N/2 of the output symbols. This partial action approach allows the system to maintain the mathematical integrity of the full transform while efficiently using only the necessary portion of the result, balancing accuracy requirements with calculation efficiency.
2Stability of the object's composition
If the overlap ratio is increased to ensure continuous signal processing, then the processing continuity is improved, but the calculation redundancy increases
Solution Approach 1:
The patent implements continuous signal processing by overlapping adjacent blocks, where the output of one block feeds into the next. This ensures processing continuity without requiring excessive overlap, as the system efficiently utilizes the N/2 useful symbols from each block while maintaining seamless signal flow through proper block overlap management.
Solution Approach 2:
The patent optimizes the overlap ratio parameter to balance continuity requirements with calculation efficiency. By adjusting the overlap parameter and utilizing only N/2 output symbols per block, the system achieves continuous processing while minimizing redundant calculations that would occur with higher overlap ratios.
Data Source
AI summary
According to an aspect of the present invention, there is provided a signal processing device including: a Fourier transform processing unit that converts an input signal into a frequency domain signal for each block having a size N; a multiplication processing unit that performs filtering processing on the converted frequency domain signal by using a filter weighting coefficient; an inverse Fourier transform processing unit that performs inverse Fourier transform processing on the frequency domain signal on which the filtering processing is performed; and an output signal selection unit that stores N/2+Δ symbols centered on an N/2-th output symbol from the head among output symbols having a size N which are obtained by performing inverse Fourier transform processing, and outputs a signal obtained by discarding output symbols other than the stored output symbols.