Filter-Bank Demultiplexing With Frequency Offset Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing demultiplexing and multiplexing technologies face limitations in frequency arrangement flexibility, leading to inefficient use of frequency bands, increased circuit complexity, and higher power consumption due to the use of band-pass filters and complex multiplication processes.
Innovation Solution
A demultiplexing apparatus with frequency converting low-pass filter units that apply frequency conversion and down-sampling to remove high-frequency components, allowing for flexible frequency arrangement and reduced power consumption by using low-pass filters and a reception-filter-bank control unit to determine optimal frequency offsets based on channel information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If band-pass filters are used for frequency selection in demultiplexing, then frequency arrangement flexibility is improved, but device complexity and power consumption increase
Solution Approach 1:
Instead of using band-pass filters to directly select specific frequency bands, the patent inverts the approach by using low-pass filters to remove high-frequency components and then using frequency conversion (mixing) to shift the remaining signal to the desired frequency band. This inversion simplifies the filter design while maintaining frequency selection capability.
Solution Approach 2:
The patent segments the frequency selection process into two distinct stages: first, low-pass filtering to remove high-frequency components, and second, frequency conversion to shift the signal to the target band. This segmentation allows each stage to be optimized independently, reducing overall system complexity.
2Adaptability or versatility
If band-pass filters are used for frequency selection, then frequency band isolation is improved, but power consumption increases
Solution Approach 1:
The patent extracts only the necessary low-pass filtering function from the traditional band-pass filter approach. By removing high-frequency components with low-pass filters and then using efficient frequency conversion, the system achieves frequency band isolation with lower power consumption compared to implementing full band-pass filtering.
3Adaptability or versatility
If complex multiplication processes are used for frequency conversion, then frequency arrangement flexibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the low-pass filtering and frequency conversion operations into an integrated processing chain. By combining these functions in sequence rather than treating them as separate complex operations, the system achieves frequency arrangement flexibility while reducing overall circuit complexity.
Data Source
AI summary
A demultiplexing apparatus includes, in each of n stages, 2n FC+RXHBFs that down-sample a signal, from which a high-frequency component is removed after frequency conversion is carried out, and output the signal. The demultiplexing apparatus extracts, from an input signal including a plurality of band signals, the band signals to thereby demultiplex the input signal. The demultiplexing apparatus includes a reception-filter-bank control unit that calculates, based on channel information including bands and frequency arrangement of the band signals, a dividing position on a frequency axis and a frequency offset value indicating a frequency conversion value and instructs the FC+RXHBF, which is set as a target of output of divided signals of the input signal, about the calculated values. The FC+RXHBF carries out frequency conversion based on the frequency offset value.