Multichannel Transmit Power Control via Channel Matrix Feedback
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Solution Overview
Problem
In microwave multichannel communication systems, existing Automatic Transmit Power Control (ATPC) technologies fail to accurately manage transmit power due to in-band interference, leading to inadequate reduction of fading variation impacts on system performance.
Innovation Solution
A method that determines useful receive power in multichannel systems by using a channel matrix to calculate the required transmit power, sending power adjustment messages from the receive end to the transmit end to adjust power levels, ensuring the receive power requirement is met, thereby reducing the impact of fading variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing ATPC technology is used in multichannel systems, then transmit power can be controlled, but in-band interference from other transmit antennas prevents accurate acquisition of useful receive power
Solution Approach 1:
The patent segments the total receive power into useful signal power and interference power by using channel matrix information. The receive end calculates the channel matrix H based on channel estimation sequences, then uses this matrix to determine the proportion of useful signal in the total receive power, effectively separating the useful power from interference for accurate measurement
Solution Approach 2:
The patent implements a feedback mechanism where the receive end determines the useful receive power and compares it with the required receive power, then sends power adjustment messages back to the transmit end. The transmit end adjusts its transmit power based on this feedback, creating a closed-loop control system that continuously optimizes power levels despite interference conditions
2Productivity
If multichannel communication is used to achieve Gbps transmission rates, then bandwidth requirements are reduced, but fading variation impact on system performance increases
Solution Approach 1:
The patent employs feedback control where the receive end continuously monitors useful receive power and sends adjustment messages to the transmit end when fading occurs. This allows the system to dynamically respond to channel conditions and maintain reliable communication even at high transmission rates
Solution Approach 2:
The patent changes the transmit power parameter dynamically based on detected fading conditions. When fading is detected, the transmit power is adjusted within the ATPC control range to compensate for the fading variation, thereby maintaining system performance stability despite operating at high multichannel transmission rates
Data Source
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AI summary
The present invention discloses a method for controlling a transmit power in a multichannel system, a receive end, and a transmit end. The method includes: receiving, through N receive channels, N signals sent by a transmit end, where the N signals include a channel estimation sequence; determining a total receive power of an ith receive channel; determining a channel matrix according to a received channel estimation sequence; determining a useful receive power of the ith receive channel according to the channel matrix and the total receive power of the ith receive channel; determining, according to the channel matrix and a receive power that is required by single-channel communication, a receive power required by the ith receive channel; and sending a power adjustment message to the transmit end if the useful receive power of the ith receive channel does not match the receive power required by the ith receive channel, so that the transmit end adjusts a transmit power of an ith signal. According to the method for controlling a transmit power in a multichannel system, the receive end, and the transmit end in the embodiments of the present invention, the impact of fading variation in a multichannel system can be reduced.