Time-Reversal Filter Power Control for Spectral Mask Compliance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communication systems with multiple transmitters and receivers, time-reversal techniques can amplify signals but often alter the power spectral density, leading to spectral mask violations, which are not addressed effectively by existing technologies.
Innovation Solution
Implementing a transmitter with a time-reversal filter and a power control module to maintain the power spectral density within predetermined spectral mask requirements by reducing transmitter power or selecting appropriate time-reversal filters based on channel characteristics and spectral mask constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-reversal techniques are used to amplify signals and improve temporal focusing, then signal-to-noise ratio is improved, but power spectral density is altered causing spectral mask violations
Solution Approach 1:
The patent modifies the parameters of the time-reversal filter to control the power spectral density of the transmitted signal. By adjusting filter coefficients and applying power control, the system changes the spectral parameters to ensure compliance with spectral masks while preserving the temporal focusing effect that improves signal-to-noise ratio.
Solution Approach 2:
The system dynamically adjusts the time-reversal filter characteristics based on channel conditions and spectral mask requirements. The power control module continuously monitors and modifies the transmitted signal parameters to maintain spectral compliance while optimizing signal quality, making the system adaptable to varying communication conditions.
2Manufacturing precision
If time-reversal filtering is applied to temporally focus the signal, then inter-symbol interference is reduced, but the power spectral density changes may cause spectral mask violations
Solution Approach 1:
The patent adjusts the parameters of the time-reversal filter to achieve optimal temporal focusing while controlling the power spectral density. By modifying filter coefficients and applying power control, the system maintains precise temporal focusing to reduce inter-symbol interference while ensuring spectral compliance through parameter optimization.
3Reliability
If transmitter power is increased to improve signal strength at the receiver, then signal-to-noise ratio improves, but spectral mask requirements are violated
Solution Approach 1:
The patent changes the spectral parameters of the transmitted signal by applying time-reversal filtering and power control. This allows the system to maintain adequate signal strength at the receiver while shaping the power spectral density to comply with spectral mask requirements, effectively decoupling signal strength from spectral compliance through parameter optimization.
Data Source
AI summary
Time-reversal filtering may be used to temporally focus a signal to be transmitted. Power can be reduced at the transmitter so that the temporally focused signal is within spectral mask requirements. In one embodiment, the effect of the time-reversal filter on the power spectral density for a particular transmitted signal can be calculated and the predicted power spectral density can be compared to the permitted spectral mask to identify violations, if any, of the spectral mask. The transmitter power can then be reduced by the amount of the violation. In another embodiment, a set of different time-reversal filters that meet the spectral mask requirements can be provided in advance, and the most appropriate filter—e.g., the one with the best signal-to-noise ratio for the particular signal—can be chosen from the set of filters.