Transmit Power Control Using Distance-Based Initial Estimation
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Solution Overview
Problem
Existing wireless data communication systems require multiple iterative steps to determine optimal transmit power levels, leading to increased power drain and interference due to the need for multiple bidirectional data exchanges.
Innovation Solution
Estimating an initial transmit power based on the distance between transceivers, using measured propagation time and path loss calculations, to quickly converge on an optimal power level, potentially reducing the need for further iterative adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple iterative bidirectional data exchanges are performed to determine optimal transmit power, then accurate power control is achieved, but power drain increases and communication time increases causing interference to other transceivers
Solution Approach 1:
The system performs preliminary ranging measurements to estimate distance between transceivers before initiating the power control process. This preliminary action provides initial information that reduces the number of iterative power adjustment steps needed, thereby reducing power drain while maintaining accurate power control.
Solution Approach 2:
The patent accelerates the power control convergence by using distance-based initial power estimation to skip unnecessary iterative steps. The system rushes through the power determination process by leveraging the preliminary distance information to directly calculate an initial optimal power level, reducing the time and energy spent on multiple bidirectional exchanges.
2Reliability
If multiple iterative bidirectional data exchanges are performed to determine optimal transmit power, then accurate power control is achieved, but communication time increases causing interference to other transceivers
Solution Approach 1:
The system performs preliminary ranging measurements to estimate distance between transceivers before initiating the power control process. This preliminary action provides initial information that reduces the number of iterative power adjustment steps needed, thereby reducing communication time and interference to other transceivers while maintaining accurate power control.
Solution Approach 2:
The patent accelerates the power control convergence by using distance-based initial power estimation to skip unnecessary iterative steps. The system rushes through the power determination process by leveraging the preliminary distance information to directly calculate an initial optimal power level, reducing the time spent on multiple bidirectional exchanges and minimizing interference to other transceivers.
3Reliability
If transmit power is set high to ensure reliable communication, then communication reliability is improved, but interference to other users sharing the same spectrum increases
Solution Approach 1:
The system dynamically adjusts the transmit power parameter based on the measured distance between transceivers. By changing the power level to match the actual communication requirements, the system ensures reliable communication at the minimum necessary power, thereby reducing interference to other users sharing the spectrum.
Solution Approach 2:
The system uses feedback from distance measurements to adjust transmit power levels. The ranging information provides feedback that enables the transmitter to set an optimal power level tailored to the specific communication scenario, ensuring reliability while minimizing harmful interference to other users.
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 minimizes the number of iterative steps required to achieve optimal transmit power, reducing power drain and interference by setting an initial power level closer to the optimal value, often eliminating the need for further adjustments.
Implementation Method 1
measuring the propagation time of a data packet from the first transceiver to the second or more transceiver and back. Because radio waves travel at a nearly constant velocity in air, this round-trip propagation time correlates well to the distance between the transceivers
Data Source
AI summary
The distance between a first Multi Band Orthogonal Frequency Division Multiplex (MB-OFDM) data transceiver and a second or more such transceiver is determined using known techniques. The radio frequency path loss between transceivers is estimated given said distance, using a known relationship between distance and path loss, and further accounting for line-of-sight or non-line-of-sight conditions if desired. This path loss value is added to the typically minimum transmit power level, absent path loss, needed for reliable data communication. This modified initial transmit power level is then used by the first transceiver to begin the known iterative feedback process of transmit power control (TPC). Because this modified initial transmit power level, based on distance, is closer to the final optimum level, convergence in the TPC process occurs in fewer steps and less time than had the initial transmit power been maximum power as is typical in known TPC systems.