Dynamic Virtual Subcarrier Setting for Multicarrier Spectrum Adaptation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current multicarrier transmission systems are designed for static frequency spectra, making them inflexible and inefficient in dynamic frequency spectrum scenarios, as the number and location of virtual subcarriers are fixed and cannot be adapted to changing conditions.
Innovation Solution
A method and apparatus for dynamically setting virtual subcarriers in a multicarrier transmission system, where the transmitter determines the number and location of virtual subcarriers based on acquired dynamic spectrum information to avoid aliasing and optimize spectrum usage, ensuring the total number is not less than the guard band and not greater than the DFT dimension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number and location of virtual subcarriers are fixed in the system design, then the implementation is simple and the system is easy to manufacture, but the system cannot adapt to dynamic frequency spectrum scenarios and spectrum utilization efficiency deteriorates
Solution Approach 1:
The patent makes the virtual subcarrier configuration dynamic by allowing the number and location of virtual subcarriers to be adjusted according to actual spectrum conditions. The system determines virtual subcarrier parameters based on received spectrum information, enabling the previously static configuration to adapt to changing frequency spectrum environments while maintaining implementation feasibility through standardized adjustment procedures.
Solution Approach 2:
The patent changes the parameters of virtual subcarriers (number and location) based on spectrum conditions. By modifying these parameters dynamically rather than keeping them fixed, the system achieves better adaptability to dynamic frequency spectrum scenarios while maintaining reasonable implementation complexity through parameter adjustment rather than structural redesign.
2Reliability
If more virtual subcarriers are used to prevent spectrum aliasing, then the reliability of signal transmission is improved, but the spectrum utilization efficiency deteriorates due to wasted bandwidth
Solution Approach 1:
The patent dynamically adjusts the number and location parameters of virtual subcarriers based on actual spectrum conditions and signal requirements. This allows the system to use the minimum necessary number of virtual subcarriers to prevent aliasing, rather than using a fixed excessive number, thereby improving spectrum utilization while maintaining reliability.
Solution Approach 2:
The patent avoids excessive use of virtual subcarriers by determining the appropriate number based on actual needs. Instead of always using a large fixed number of virtual subcarriers, the system applies partial action by using only the necessary amount to prevent aliasing, thus improving spectrum efficiency while maintaining signal reliability.
3Productivity
If the transmission bandwidth is increased to accommodate more data, then the productivity is improved, but the risk of spectrum aliasing increases requiring more guard bands
Solution Approach 1:
The patent enables dynamic adjustment of virtual subcarrier configuration based on transmission bandwidth and spectrum conditions. When transmission bandwidth increases to accommodate more data, the system dynamically determines appropriate virtual subcarrier parameters to maintain adequate guard bands and prevent aliasing, rather than using a fixed configuration that would either waste spectrum or risk aliasing.
Data Source
Figure 1~2A
Figure 2B~3A
Figure 3B~3C
AI summary
The present invention provides a method for dynamically setting virtual subcarriers, a receiving method, apparatus and a system. The setting method includes: acquiring, by a transmitter, dynamic spectrum information of a geographic location where the transmitter is located; determining the number of the left edge virtual subcarriers and the number of the right edge virtual subcarriers of the multicarrier transmission system, according to the dynamic spectrum information, at the left and right edges of a working spectrum of the transmitter, to make a sum of the number of the left edge virtual subcarriers and the number of the right edge virtual subcarriers be not less than an aliasing guard band of a baseband signal of the multicarrier transmission system, and be not greater than a dimension of discrete Fourier transform of the baseband signal; and setting virtual subcarriers of the multicarrier transmission system according to the number of the left edge virtual subcarrier and the number of the right edge virtual subcarriers determined. The virtual subcarriers are dynamically set in the present invention, so that a bandwidth and an occupied spectrum of the baseband signal can adaptively change, a spectrum dynamic range of the baseband signal is expanded, and less software and hardware devices are required for covering a given spectrum.