Transmission Power Control for Hidden-Node Avoidance
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Solution Overview
Problem
Existing communication systems face challenges in determining an optimal transmission power back-off level to avoid the hidden-node problem, particularly in powerline communication systems with complex channel characteristics and shared media, leading to inefficiencies in power usage and data rate.
Innovation Solution
A method where each receiver performs channel estimation and suggests a transmission power back-off level to the transmitter, which determines a new power back-off level that is the lowest among the collected suggestions to ensure all receivers can hear transmitted packets, thereby maximizing power efficiency and data rate while avoiding the hidden-node problem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If transmission power is reduced to improve power efficiency and reduce electromagnetic radiation, then power consumption and EM radiation are decreased, but the hidden-node problem occurs where distant nodes cannot hear the signal
Solution Approach 1:
The system performs preliminary channel estimation and power back-off negotiation before actual data transmission. Each receiver estimates the channel characteristics and suggests a power back-off level, allowing the transmitter to pre-determine an appropriate power level that ensures all receivers can detect the signal, thereby preventing hidden-node problems before they occur.
Solution Approach 2:
The system implements feedback mechanisms where receivers provide channel estimation information and power back-off suggestions to the transmitter. The transmitter uses this feedback to dynamically adjust the transmission power level, ensuring optimal power efficiency while maintaining reliable communication across all receivers.
2Productivity
If transmission power is adjusted to improve SNR at receiving side, then data rate is increased, but power efficiency decreases and electromagnetic radiation increases
Solution Approach 1:
The system dynamically adjusts the transmission power parameter based on channel conditions and receiver requirements. By negotiating power back-off levels and adapting power levels per outgoing channel, the system optimizes the balance between achieving sufficient SNR for high data rates and minimizing power consumption and electromagnetic radiation.
3Device complexity
If power back-off level is determined without considering all outgoing channels, then determination is simplified, but hidden-node problem occurs due to insufficient power for distant nodes
Solution Approach 1:
The system segments the power back-off determination process by handling each outgoing channel independently. Each receiver provides channel estimation for its specific outgoing link, and the transmitter determines power levels separately for each channel based on the weakest channel conditions, ensuring all receivers can detect the signal without requiring excessive complexity.
Data Source
AI summary
The present invention discloses a transmission power control method for a communication system comprising a transmitter and a plurality of receivers. The transmitter is coupled to the plurality of receivers via a plurality of corresponding outgoing links. The transmission power control method comprising steps of each of the plurality of receivers performing channel estimation for each of the plurality of corresponding outgoing links, and replying a first suggested transmission power back-off level to the transmitter; and the transmitter determining a new transmission power back-off level after collecting a plurality of first suggested transmission power back-off levels from the plurality of receivers.