Receiver Bias Switching Based on RF Jammer Detection
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Solution Overview
Problem
Wireless communication receivers face challenges in managing power consumption and signal quality due to radio frequency (RF) jammers, which degrade signal-to-noise ratio (SNR) and block error rate (BER), and existing solutions either increase power consumption or compromise data throughput.
Innovation Solution
A system that includes a radio frequency (RF) jammer detector and a receiver bias circuit to dynamically adjust the supply voltage of active components based on the presence of RF jammers, providing a low voltage when no jammer is detected to conserve power and a high voltage when a jammer is present to maintain SNR and BER performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver operates at high supply voltage to maintain SNR and BER performance in the presence of RF jammers, then signal quality is improved, but power consumption increases
Solution Approach 1:
The receiver bias circuit dynamically adjusts the supply voltage to the receiver based on real-time jammer detection status. When an RF jammer is detected, the circuit switches to high voltage mode to maintain SNR and BER performance. When no jammer is present, it switches to low voltage mode to conserve power. This dynamic adaptation resolves the contradiction by making the voltage level conditional rather than fixed.
Solution Approach 2:
The system changes the supply voltage parameter from a static value to a variable that adapts to environmental conditions. The receiver bias circuit modifies the voltage parameter based on jammer presence, allowing the system to optimize between power consumption and signal quality by adjusting this critical parameter in response to external threats.
2Use of energy by moving object
If the receiver operates at low supply voltage to conserve power, then power consumption is reduced, but SNR and BER performance deteriorate in the presence of RF jammers
Solution Approach 1:
The system transitions from a static low-voltage operating mode to a dynamic mode where voltage level is continuously adapted based on jammer detection. The receiver bias circuit enables the system to switch between low and high voltage states, ensuring that power savings are achieved during normal operation while performance is maintained when needed.
Solution Approach 2:
The RF jammer detector provides feedback about the presence of jammers to the receiver bias circuit, which then adjusts the supply voltage accordingly. This feedback loop ensures that the system responds to environmental conditions in real-time, switching from power-saving mode to performance mode only when necessary, thus resolving the contradiction between power consumption and reliability.
3Reliability
If the receiver continuously operates at high voltage to ensure reliable performance, then SNR and BER are maintained, but battery life is reduced
Solution Approach 1:
The system employs periodic monitoring of the RF environment through the jammer detector, which continuously or periodically checks for the presence of jammers. Based on these periodic assessments, the receiver bias circuit adjusts the voltage level, allowing the system to spend most time in low-power mode while periodically switching to high-performance mode only when jammers are detected, thus extending battery life while maintaining reliability when needed.
Solution Approach 2:
The supply voltage is transformed from a continuous high state to a dynamic state that alternates between low and high levels based on environmental conditions. This dynamic voltage adjustment significantly reduces average power consumption and extends battery life while ensuring that high performance is available whenever jammers are present.
4Use of energy by moving object
If the receiver uses dynamic voltage adjustment based on jammer detection, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The receiver system is segmented into functionally independent modules: an RF jammer detector, a receiver bias circuit, and the main receiver. Each module performs a specific function, and the bias circuit acts as an intermediary that translates detector output into appropriate voltage levels for the receiver. This segmentation allows the complex functionality to be distributed and managed in manageable parts, reducing overall system complexity while enabling dynamic voltage adjustment.
Solution Approach 2:
The receiver bias circuit serves as an intermediary component between the jammer detector and the receiver. It translates the detector's output signal into the appropriate supply voltage level for the receiver, isolating the complexity of voltage regulation from both the detector and the receiver. This intermediary approach simplifies the overall system architecture while enabling sophisticated power management.
Data Source
AI summary
The disclosure relates to an apparatus including a receiver configured to process a radio frequency (RF) signal to generate a baseband signal; a radio frequency (RF) jammer detector configured to generate a signal indicative of whether an RF jammer is present at an input of the receiver; and a receiver bias circuit configured to generate a supply voltage for the receiver based on the RF jammer indication signal. In another aspect, the apparatus includes constant gain bias circuit to maintain the gain of the receiver constant in response to changes in the supply voltage. In other aspects, the receiver bias circuit may suspend the generating of the supply voltage based on the RF jammer indication signal if the power level of the target received signal is above a threshold. In other aspects, the receiver bias circuit changes the supply voltage during cyclic prefix (CP) intervals between downlink intervals.