I/Q Time Delay Compensation for Communication Signal Quality
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Solution Overview
Problem
Communication systems using in-phase and quadrature-phase components face performance degradation due to differences in time delay between these components, primarily caused by varying circuit lengths, channel fading, and phase noise, which existing technologies fail to adequately compensate for.
Innovation Solution
A system and method for determining and compensating the time delay between in-phase and quadrature-phase signal components by using a start time determination module and delay module, which receive reference signals to calculate and adjust the delay, allowing for accurate synchronization and signal recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different circuit lengths are used for I and Q channels, then circuit design flexibility is improved, but I/Q time delay increases
Solution Approach 1:
The patent changes the time delay parameter by introducing adjustable delay elements in the I or Q channel to match the time delays caused by different circuit lengths. This allows the system to maintain circuit design flexibility while compensating for the resulting time delay differences through parameter adjustment.
Solution Approach 2:
The patent employs feedback mechanisms where the time delay differences between I and Q channels are measured and used to adjust the delay elements. This closed-loop approach ensures that the system automatically compensates for time delay variations while maintaining design flexibility.
2Adaptability or versatility
If channel fading and phase noise are present, then real-world communication conditions are met, but I/Q time delay increases
Solution Approach 1:
The patent applies preliminary time delay compensation before signal demodulation and processing. By pre-aligning the I and Q channels using delay elements adjusted according to measured time delay differences, the system prepares the signals to be more resistant to the effects of channel fading and phase noise, thereby maintaining reliability in real-world conditions.
3Device complexity
If I/Q time delay compensation is not applied, then system complexity is reduced, but communication performance deteriorates
Solution Approach 1:
The patent segments the time delay compensation function into separate adjustable delay elements for the I and Q channels, rather than implementing a complex unified compensation system. This modular approach reduces overall system complexity while maintaining the ability to compensate for time delay and improve communication performance.
Data Source
AI summary
A system for determining a time delay between an in-phase signal component and a quadrature-phase signal component includes an in-phase signal start time determination module coupled to an in-phase delay module, the in-phase signal start time determination module and the in-phase delay module configured to receive an in-phase signal component of a received signal. The in-phase signal start time determination module is configured to receive a reference signal. The system also includes a quadrature-phase signal start time determination module coupled to a quadrature-phase delay module, the quadrature-phase signal start time determination module and the quadrature-phase delay module configured to receive a quadrature-phase signal component of a received signal. The quadrature-phase signal start time determination module is configured to receive a reference signal, wherein the in-phase delay module is configured to develop an in-phase delay signal and the quadrature-phase delay module is configured to develop a quadrature-phase delay signal.