Wireless Sub-Spectrum Power Density Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems performing band division and synthesis transmission, large power density differences between sub-spectra can lead to varying carrier-to-noise ratios, causing signal quality deterioration due to uneven noise distribution across different sub-spectra bands.
Innovation Solution
A wireless communication system with a transmission device that includes a band division unit and a transmission gain control unit, which adjusts the transmission gain of each sub-spectrum based on feedback from a reception device to ensure uniform power densities across all sub-spectra, and a reception device with a reception power density detection unit and feedback unit to maintain uniform power densities during band synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission gain control is performed to ensure uniform power densities across sub-spectra, then signal quality is improved, but device complexity increases due to feedback mechanisms and gain control circuits
Solution Approach 1:
The reception device measures the power density of each sub-spectrum and feeds back this information to the transmission device. The transmission device then adjusts the transmission gain of each sub-spectrum based on this feedback to achieve uniform power densities across all sub-spectra, thereby improving signal quality while managing system complexity through intelligent control
Solution Approach 2:
The system dynamically changes the transmission gain parameter for each sub-spectrum based on measured power density conditions. By adjusting the gain parameter individually for each sub-spectrum, the system achieves uniform power distribution without requiring complete system redesign, thus improving reliability with controlled complexity increase
2Reliability
If reception gain control is performed to uniformize power densities, then signal quality is improved, but noise is amplified along with the signal
Solution Approach 1:
Instead of performing gain control at the reception device (which amplifies both signal and noise), the invention inverts the control point to the transmission device. The transmission device adjusts the transmission gain of each sub-spectrum before transmission, ensuring uniform power densities are achieved at the source, thereby improving signal quality without amplifying noise at the reception end
Data Source
AI summary
In a wireless communication system that performs a wireless communication by performing band division into a plurality of sub-spectra, a transmission device includes a band division unit and a transmission gain control unit configured to control a transmission gain of each of transmission signals of a plurality of sub-spectra for each sub-spectrum in accordance with information that is related to a power density of each sub-spectrum and fed back from a reception device so that the power density of each of reception signals of the plurality of sub-spectra on the reception device is uniform, and the reception device includes a reception power density detection unit configured to detect the power density of each of the plurality of sub-spectra to be received, a feedback unit configured to feed back information regarding the power density to the transmission device, and a band synthesis unit. Thus, it is possible to avoid deterioration of signal quality in hand division and synthesis transmission.