Wireless Transceiver Interference Detection Using Shared Power Detector
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Solution Overview
Problem
Conventional Bluetooth wireless transceivers face signal saturation and poor reception quality due to Wi-Fi interference, which requires additional circuit elements and power consumption for continuous interference detection.
Innovation Solution
A wireless transceiver apparatus with a power detector on the transmission side for interference detection, sharing partial circuits for both signal transmission and interference detection, allowing for power-saving and avoiding additional circuit area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional circuit elements are added for continuous interference detection, then interference detection capability is improved, but power consumption increases and circuit area expands
Solution Approach 1:
The power detector originally designed for monitoring power amplifier output power during transmission is made multi-functional by enabling it to detect interference signals during reception mode as well. The detection result is then used to dynamically adjust the gain of the low-noise amplifier, thereby eliminating the need for separate dedicated interference detection circuits and reducing overall power consumption while maintaining interference detection capability.
2Measurement precision
If additional circuit elements are added for continuous interference detection, then interference detection capability is improved, but circuit area increases
Solution Approach 1:
The power detector is designed to serve dual purposes: monitoring the power amplifier during transmission mode and detecting interference signals during reception mode. This multi-functional design allows the same hardware circuit to perform both functions, thereby avoiding the need for additional dedicated interference detection circuits and reducing the overall circuit area occupation.
Solution Approach 2:
The interference detection function is merged with the existing power detection function by using the same power detector circuit for both purposes. The detection path is switched between transmission power monitoring and reception interference detection based on operational mode, combining multiple functions into a single integrated circuit rather than using separate dedicated circuits.
3Reliability
If amplifier gain is increased for better signal reception, then signal reception sensitivity is improved, but signal saturation occurs due to interference
Solution Approach 1:
The amplifier gain is changed from a static fixed value to a dynamic adjustable parameter. The system continuously monitors interference levels using the power detector and dynamically adjusts the low-noise amplifier gain accordingly - increasing gain when interference is low to improve sensitivity, and decreasing gain when interference is high to prevent saturation. This dynamic adaptation resolves the contradiction between reception sensitivity and saturation avoidance.
Solution Approach 2:
A feedback loop is established where the power detector monitors the received signal and detects interference levels, then feeds this information back to the processing circuit which adjusts the amplifier gain accordingly. This closed-loop feedback mechanism enables the system to automatically adapt to varying interference conditions, maintaining optimal reception sensitivity while preventing signal saturation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively detects Wi-Fi interference without occupying extra circuit space, reducing power consumption and maintaining signal quality by adapting amplifier gain values based on detected interference levels.
Implementation Method 1
the power detector detects a power of the received wireless signal to measure an interference power value
Data Source
AI summary
A wireless transceiver apparatus includes a power detector, an analog signal receiving circuit at wireless signal reception side, and a processing circuit. The power detector is configured at wireless signal transmission side and used for detecting power of a power amplifier on a transmitting path of wireless signal transmission side. The analog signal receiving circuit is couple to the power detector and used for receiving a wireless signal form an antenna. Under signal reception mode, the analog signal receiving circuit transmits the received wireless signal to the processing circuit. Under interference detection mode, the analog signal receiving circuit transfers the received wireless signal (as interference) to the power detector, and the power detector is used for detecting the power of wireless signal to measure an interference power value and transmit the value to the processing circuit.