Communication System Dual Sampling Speed Spectrum Division
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Solution Overview
Problem
Direct spectrum division transmission methods result in large circuit sizes due to the need for high frequency resolution and increased sampling points, making it difficult to divide signal spectra effectively without enlarging the circuit size further.
Innovation Solution
A communication system that employs two sampling speeds, using a low first sampling speed for spectrum division and a high second sampling speed for multiplexing and demultiplexing, allowing for fine frequency resolution without increasing circuit size by adjusting sampling speeds and processing sections through time-division processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high frequency resolution is used to divide signal spectra, then spectrum division precision is improved, but circuit size becomes large
Solution Approach 1:
The patent divides the spectrum division process into two stages: first dividing the bandwidth W into multiple sub-spectra at low sampling speed F1, then further distributing each sub-spectrum into multiple narrower sub-spectra at high sampling speed F2. This segmentation of the frequency division process allows achieving fine frequency resolution without requiring a single large-scale high-resolution FFT circuit, thus reducing overall circuit size while maintaining spectral division precision.
Solution Approach 2:
The patent introduces a time dimension by using different sampling speeds (F1 and F2) for different stages of spectrum division. Instead of achieving fine frequency resolution through a single high-resolution frequency domain operation that requires large circuit size, the system uses time-division multiplexing with two different sampling rates, effectively trading time for frequency resolution and avoiding the need for a large single-stage FFT circuit.
2Measurement precision
If sampling points are increased to achieve fine frequency resolution, then spectrum division precision is improved, but processing complexity increases
Solution Approach 1:
The patent segments the frequency division task into two hierarchical levels: first level divides the total bandwidth W into multiple sub-spectra using low sampling speed F1, and second level distributes each sub-spectrum into narrower sub-spectra using high sampling speed F2. This segmentation reduces processing complexity by breaking down a single complex high-resolution FFT operation into multiple simpler low-resolution FFT operations performed sequentially at different sampling rates.
Solution Approach 2:
The patent employs dynamic sampling speed adjustment, switching between low sampling speed F1 for initial spectrum division and high sampling speed F2 for subsequent sub-spectrum distribution. This dynamic adaptation of sampling rates allows the system to optimize processing complexity by using lower sampling speeds when fine frequency resolution is not yet required, and only increasing sampling speed when necessary for final spectral distribution.
3Productivity
If bandwidth F2 is made wider to distribute spectra, then frequency utilization efficiency is improved, but frequency resolution for division becomes insufficient
Solution Approach 1:
The patent segments the bandwidth distribution process into two hierarchical stages: first distributing the total bandwidth W into multiple sub-spectra across the wide bandwidth F2 at low sampling speed F1, then further distributing each sub-spectrum into narrower sub-sub-spectra at high sampling speed F2. This segmentation allows the system to utilize the wide bandwidth F2 for high frequency utilization efficiency while maintaining sufficient frequency resolution through the second-stage high-speed sampling process.
Solution Approach 2:
The patent resolves the contradiction between wide bandwidth utilization and frequency resolution by introducing a hierarchical frequency division structure. The first level operates at low sampling speed F1 to distribute spectra across the wide bandwidth F2, maximizing frequency utilization efficiency. The second level operates at high sampling speed F2 to provide fine frequency resolution for each distributed sub-spectrum, effectively adding a hierarchical dimension to the frequency division process.
Data Source
AI summary
A transmitter of a communication system includes a spectrum dividing section which divides a transmission signal into a plurality of sub-spectra at a first sampling speed F1 and combines one or more low-speed intermediate composite signals from the divided sub-spectra, and a multiplexing section which multiplexes the intermediate composite signals at a second sampling speed F2 faster than the first sampling speed F1 (F2>F1) and distributes to a broadband. A receiver includes a demultiplexing section which extracts one or more low-speed intermediate composite signals from a reception signal at the second sampling speed F2, and a spectrum combining section which combines the intermediate composite signals at the first sampling speed F1 and extracts the sub-spectra to re-combines the transmission signal.