Low-Noise Amplifier Bypass for Power-Efficient Packet Listening
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Solution Overview
Problem
Low gain listen wireless communication systems face significant power consumption due to the continuous operation of low noise amplifiers (LNAs) during carrier state searches, where the system configures for the lowest noise figure to maximize packet reception probability, leading to high power usage even when signal strength is sufficient for proper demodulation.
Innovation Solution
A wireless communication device that determines signal power levels and bypasses the low noise amplifier when the signal strength is above a threshold or when a packet is not present, using a switch circuit to route the signal either through the LNA or a bypass route, thereby reducing power consumption by powering down the LNA during periods of sufficient signal strength or absence of packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the low noise amplifier operates continuously with lowest noise figure configuration to maximize packet reception probability, then the reliability of packet reception is improved, but the power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the LNA configuration adaptive rather than static. The system dynamically switches between two operational modes: (1) LNA enabled with lowest noise figure configuration when signal strength is below threshold or no packet is detected, and (2) LNA bypassed when signal strength exceeds threshold or packet is present. This dynamic adaptation resolves the contradiction by adjusting the noise figure configuration based on real-time signal conditions, maintaining high packet reception probability only when necessary while reducing power consumption during periods of sufficient signal strength.
Solution Approach 2:
The patent changes the noise figure parameter of the LNA based on signal strength conditions. The system monitors RSSI and accordingly adjusts the LNA configuration: using the lowest noise figure setting when signals are weak to maximize reception probability, and bypassing the LNA (effectively changing the noise figure parameter) when signals are strong enough. This parameter change strategy resolves the technical contradiction by optimizing the noise figure parameter dynamically according to signal conditions.
2Use of energy by moving object
If the low noise amplifier is bypassed to reduce power consumption, then the power savings increase, but the noise figure performance degrades
Solution Approach 1:
The system dynamically adjusts the LNA configuration based on real-time signal strength monitoring. When RSSI exceeds the threshold or a packet is detected, the system switches to LNA bypass mode for power savings. When RSSI falls below the threshold or no packet is present, the system activates the LNA with lowest noise figure configuration. This dynamic switching strategy ensures that noise figure performance is maintained only when necessary, while achieving power savings during periods of sufficient signal strength.
Solution Approach 2:
The system changes the operational state of the LNA parameter based on signal conditions. By monitoring RSSI and packet presence, the system adjusts whether the LNA is active or bypassed, effectively changing the noise figure parameter of the receiver chain. This parameter change resolves the contradiction by degrading noise figure performance (bypassing LNA) only when signal strength is sufficient, thereby achieving power savings without compromising reception reliability when needed.
3Measurement precision
If the system configures for lowest noise figure during carrier state searches, then the detection sensitivity is improved, but the power consumption increases due to continuous LNA operation
Solution Approach 1:
During carrier state searches, the system dynamically configures the LNA based on detected signal strength. When the carrier signal strength exceeds the threshold, the system bypasses the LNA to reduce power consumption. When the carrier signal strength is below the threshold or no carrier is detected, the system activates the LNA with lowest noise figure configuration to maintain detection sensitivity. This dynamic configuration during carrier searches resolves the contradiction between detection sensitivity and power consumption.
Solution Approach 2:
The system changes the LNA configuration parameter during carrier state searches based on signal strength measurements. By monitoring carrier signal levels and adjusting whether the LNA is active or bypassed, the system optimizes the noise figure parameter dynamically. This parameter change enables the system to maintain high detection sensitivity only when carrier signals are weak, while achieving power savings during carrier searches when signals are strong.
Data Source
AI summary
A wireless communication device includes an antenna to receive a signal, a low noise amplifier, and circuitry that determines the power level of the signal. The circuitry also determines whether the signal includes a packet, and causes the low noise amplifier to amplify the signal when the signal includes a packet and the power level of the signal is below a threshold. The circuitry also causes the low noise amplifier to be bypassed when the signal does not include a packet, or the power level of the signal is above the predetermined threshold and the signal includes a packet.