Auxiliary Receive Path for Transmitter Signal Refinement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless transceivers face challenges in refining transmitter signals due to the complete utilization of the receiver in full duplex mode, leading to inadequate feedback for distortion control, and existing solutions like factory calibration and power detector loops are either time-intensive, non-adaptive, or susceptible to noise and variability.
Innovation Solution
An auxiliary receive path is introduced to capture transmitter leakage signals, which are processed to provide feedback for transmitter signal refinement, allowing for adaptive calibration and distortion control without overburdening the main receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the receiver is completely utilized in full duplex operation mode, then communication throughput is improved, but the ability to detect transmitter signal attributes for distortion control is lost
Solution Approach 1:
The receive path is segmented into two separate paths: the main receiver path that handles communication throughput, and the auxiliary receiver path that is dedicated to detecting transmitter signal attributes for distortion control. This segmentation allows both functions to operate simultaneously without interfering with each other, resolving the contradiction between maintaining full duplex communication capability and preserving transmitter signal detection capability.
2Manufacturing precision
If factory calibration with stored calibration values is used, then transmitter signal refinement is achieved, but adaptability to changing transceiver performance over time is lost
Solution Approach 1:
The auxiliary receiver path establishes a real-time feedback loop that continuously monitors transmitter signal attributes and provides information for adaptive distortion control. This feedback mechanism allows the system to automatically adjust and refine transmitter signals based on actual performance conditions, replacing static factory calibration values with dynamic, adaptive correction that responds to changing transceiver characteristics over time.
3Reliability
If analog feedback circuits with power amplifier are used, then transmitter feedback is achieved, but noise performance and stability deteriorate
Solution Approach 1:
The patent replaces the analog feedback circuit approach with a digital signal processing approach. The auxiliary receiver path captures transmitter leakage signals and processes them through digital circuits rather than analog power amplifier feedback circuits. This substitution eliminates the noise and stability issues inherent in analog approaches, as digital processing is not susceptible to the same voltage, temperature, and process variations that plague analog feedback systems.
Data Source
AI summary
Methods and apparatus to provide an auxiliary receive path to support transmitter functions are disclosed. An example transceiver includes an antenna and a duplexer coupled to the antenna. A transmitter is coupled to the duplexer to output a transmit signal at a transmit frequency. A receiver is coupled to the duplexer to receive a received signal at a receiver frequency. A signal processor is coupled to the transmitter and receiver. An auxiliary receiver is communicatively coupled to the signal processor to receive the transmit signal output from the transmitter and send an auxiliary receiver signal to the signal processor. The signal processor adjusts the transmit signal based on the auxiliary receiver signal.