Local Frequency Determination in 5G Wireless Communication Systems
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Solution Overview
Problem
In 5G mobile communication systems, the direct current (DC) component with a subcarrier can cause signal distortion when the local frequency is set at the center of the subcarrier, leading to impaired communication quality.
Innovation Solution
A method and apparatus for determining a local frequency in a wireless communication system by identifying frequency bands and determining a frequency between the first subcarrier and the second subcarrier closest to it, rather than setting it at the center, to avoid signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the local frequency is set at the center of the subcarrier, then the mixing operation can be performed, but signal distortion occurs
Solution Approach 1:
The patent extracts the problematic DC subcarrier component from the frequency band and excludes it from the local frequency selection. By identifying and removing the center subcarrier position from consideration, the solution eliminates the source of signal distortion while maintaining the mixing operation functionality.
Solution Approach 2:
The patent introduces an intermediary frequency selection mechanism that chooses a frequency between the DC subcarrier and the nearest non-DC subcarrier, rather than directly using the DC subcarrier center frequency. This intermediary approach avoids the harmful effect while preserving the mixing function.
2Ease of operation
If the local frequency is set at the center of the subcarrier, then the mixing operation can be performed, but communication quality deteriorates
Solution Approach 1:
The patent extracts the problematic DC subcarrier component from the frequency band and excludes it from the local frequency selection. By identifying and removing the center subcarrier position from consideration, the solution eliminates the source of signal distortion while maintaining the mixing operation functionality.
Solution Approach 2:
The patent introduces an intermediary frequency selection mechanism that chooses a frequency between the DC subcarrier and the nearest non-DC subcarrier, rather than directly using the DC subcarrier center frequency. This intermediary approach avoids the harmful effect while preserving the mixing function.
3Ease of operation
If the local frequency is set at the center of the subcarrier, then the mixing operation can be performed, but error vector magnitude increases
Solution Approach 1:
The patent extracts the problematic DC subcarrier component from the frequency band and excludes it from the local frequency selection. By identifying and removing the center subcarrier position from consideration, the solution eliminates the source of signal distortion while maintaining the mixing operation functionality.
Solution Approach 2:
The patent introduces an intermediary frequency selection mechanism that chooses a frequency between the DC subcarrier and the nearest non-DC subcarrier, rather than directly using the DC subcarrier center frequency. This intermediary approach avoids the harmful effect while preserving the mixing function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces signal distortion and improves wireless digital communication quality by minimizing error vector magnitude and allows for flexible sampling rates in systems with multiple frequency bands.
Implementation Method 1
A mixer is a device for changing a frequency of a signal using a local frequency
Data Source
Figure 1
Figure 2~3A
Figure 3B~3C
AI summary
The disclosure relates to a communication scheme and system for converging a 5th generation (5G) communication system for supporting a data rate higher than that of a 4th generation (4G) system with an internet of things (IoT) technology. The disclosure is applicable to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail, and security and safety-related services) based on the 5G communication technology and the IoT-related technology. The disclosure proposes a method for determining a local frequency in a wireless communication system. The local frequency determination method includes identifying frequency bands in use for communication, identifying, based on a first frequency band being in use for communication, a first subcarrier located at the center of the first frequency band among multiple subcarriers constituting the first frequency band, and determining a frequency between the first subcarrier and a second subcarrier closest to the first subcarrier as the local frequency.