Closed Loop Power Control Using PID Feedback
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Solution Overview
Problem
The increasing congestion of airwaves due to numerous wireless devices and communication standards poses challenges in maintaining reliable wireless communication systems, especially in noisy environments, as users demand greater functionality and coverage.
Innovation Solution
A closed loop power control system that measures output power, compares it to a reference signal, and adjusts the preamplifier gain using a proportional integral derivative (PID) controller, ensuring accurate power management and amplitude modulation to maintain desired transmit levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of wireless devices and communication standards increases to meet user demand for greater functionality and coverage, then the coverage area and functionality improve, but the airwave congestion and interference increase
Solution Approach 1:
The patent implements closed-loop power control where the transmitter continuously monitors the received signal power at the receiver and adjusts its transmit power accordingly. The receiver measures the signal quality and sends feedback to the transmitter, which then modifies its power output to maintain optimal signal levels despite increasing network congestion and interference.
Solution Approach 2:
The system dynamically changes the transmit power parameter based on real-time channel conditions, interference levels, and signal quality metrics. By continuously adjusting this key parameter, the system adapts to varying network conditions caused by increased device density and maintains reliable communication.
2Reliability
If transmit power is increased to improve signal reliability in noisy environments, then the signal reliability improves, but the energy consumption and interference to other users increase
Solution Approach 1:
The closed-loop power control mechanism provides continuous feedback on signal quality and channel conditions, enabling the transmitter to use only the minimum necessary power to achieve reliable communication. This prevents excessive energy consumption while maintaining signal reliability through real-time optimization.
Solution Approach 2:
The transmit power is made dynamic rather than static, allowing the system to adapt power levels to current channel conditions. When conditions are good, lower power suffices; when conditions deteriorate, power increases only as needed, optimizing the balance between reliability and energy efficiency.
3Area of stationary object
If transmit power is increased to extend coverage area, then the coverage area improves, but the interference to other wireless communications increases
Solution Approach 1:
The system receives feedback on actual signal quality and channel conditions, allowing it to extend coverage to the maximum area where reliable communication is possible without excessively increasing power beyond what is needed for that specific coverage target, thereby limiting interference to other users.
Solution Approach 2:
By dynamically adjusting transmit power based on measured channel conditions and signal quality, the system extends coverage area efficiently by using higher power only when and where necessary, rather than continuously transmitting at high power levels that would cause widespread interference.
Data Source
AI summary
Aspects of a method and system for closed loop power control in wireless systems are provided. In this regard, an output power of an amplifier may be measured and an indication of the measured power may be compared to a reference signal. The results of the comparison are utilized to generate an error correction factor. The gain of a preamplifier may be adjusted utilizing the error correction factor, where the output of the preamplifier may be input to the amplifier. The error correction factor may be generated via a proportional integral derivative controller. The gain of the preamplifier may be adjusted via at least one control signal, where the at least one control signal may be generated based on a reference control word and the error correction factor. The indication of the measured power and the reference signal may be time aligned.