Single-Tone Transmitter Calibration for Carrier Leakage and IQ Imbalance
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Solution Overview
Problem
Communication systems face challenges in calibrating carrier leakage and IQ imbalance, which affect the performance of transmission signals due to non-ideal electronic component characteristics and mismatches, requiring efficient calibration methods to minimize these impairments.
Innovation Solution
A communication system comprising a carrier signal generator, a transmitting module, a testing signal generator, a power detection unit, and a calibration apparatus, which uses single tone testing signals and combinations of DC values to determine target calibration parameters for carrier leakage and IQ imbalance, applying candidate parameters to minimize power indicating signals and determine optimal calibration settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional calibration methods are used to compensate for carrier leakage and IQ imbalance, then system performance can be improved, but the calibration process becomes complex and time-consuming
Solution Approach 1:
The patent changes the parameter being measured from general signal quality to specific power indicating signals at the specific frequency of the testing signal. By monitoring power at this specific frequency during calibration, the system can determine optimal calibration parameters more efficiently, reducing calibration complexity while maintaining performance improvement
Solution Approach 2:
The patent implements a feedback mechanism where the power detection unit continuously monitors the power indicating signal at the specific frequency, and this information is fed back to adjust calibration parameters. This closed-loop feedback enables automatic calibration convergence, reducing both complexity and time compared to open-loop traditional methods
2Manufacturing precision
If multiple calibration parameters are adjusted to minimize impairments, then signal quality improves, but the calibration time increases
Solution Approach 1:
The patent performs preliminary action by first determining the specific frequency of the testing signal and configuring the power detection unit to monitor this frequency before actual calibration begins. This preliminary setup enables faster calibration execution by having the measurement system ready and focused on the critical frequency parameter from the start
Solution Approach 2:
The patent segments the calibration process into distinct phases: (1) determining calibration parameters using power indicating signals at specific frequency, (2) applying carrier leakage calibration, and (3) applying IQ imbalance calibration. This segmentation allows each phase to be optimized independently, reducing overall calibration time while maintaining signal quality
Data Source
AI summary
A communication system for determining a target calibration parameter for calibrating impairments in a transmission signal is disclosed. The communication system includes a carrier signal generator, a transmitting module, a testing signal generator, a power detection unit, and a calibration apparatus. The testing signal generator generates a first testing signal to the first transmitting path of the transmitting module or a second testing signal to the second transmitting path of the transmitting module according to a single tone signal having a specific frequency or according to combinations of a DC value and the single tone signal. The power detection unit detects power of components associated with the specific frequency in the transmission signal to generate a power indicating signal. The calibration apparatus applies a first candidate calibration parameter to reference a first power indicating signal corresponding to the first candidate calibration parameter to determine the target calibration parameter.