Real-Time Second-Order Distortion Reduction in Radio Receivers
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Solution Overview
Problem
In radio systems, second-order distortion components generated by the transceiver's own transmitted power can interfere with the received signal, degrading the signal-to-noise ratio, especially in modern radio receiver architectures, and initial factory settings may not account for variations caused by age, temperature, and surroundings.
Innovation Solution
A method is implemented in the transceiver to estimate second-order distortion in real-time by processing I and Q components of received signals and adjusting operational parameters, such as mixer bias levels and filter settings, to minimize these distortion components using a closed-loop approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-time estimation and reduction of second order distortion is implemented, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiver continuously monitors second order distortion products generated by the transmitter and feeds this information back to adjust operational parameters. This closed-loop system dynamically compensates for distortion by adjusting mixer bias levels based on real-time measurements of distortion products, thereby improving signal-to-noise ratio while managing complexity through adaptive control.
Solution Approach 2:
The patent changes operational parameters of the transceiver, specifically adjusting mixer bias levels in real-time based on measured distortion levels. By dynamically modifying these parameters rather than using fixed factory settings, the system adapts to environmental variations and maintains optimal performance, resolving the contradiction between improving measurement precision and managing device complexity.
2Device complexity
If factory settings are used for transceiver operation, then device complexity is minimized, but adaptability to environmental variations deteriorates
Solution Approach 1:
The patent transitions from static factory settings to dynamic adaptive operation. The receiver continuously measures second order distortion products and adjusts transmitter operational parameters in real-time based on current environmental conditions. This dynamic approach allows the transceiver to adapt to temperature changes, aging effects, and surrounding interference without requiring complex manual reconfiguration, thereby improving adaptability while keeping the system relatively simple through automated control.
Data Source
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AI summary
A radio receiver method of reducing second order distortion components involves at a first mixer, mixing an input signal with an oscillator signal to generate an I component of a received radio communication signal; at a second mixer, mixing the input signal with a phase shifted oscillator signal to generate a Q component of the received radio communication signal; computing an estimate of second order distortion as a function of the I and Q components of the received radio communication signal; and adjusting an operational parameter of the radio receiver to reduce the estimated value of second order distortion components. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.