Multi-Radio Clock Drift Compensation Using Module Status Detection
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Solution Overview
Problem
In multi-radio communication devices, frequency drift caused by co-located wireless communications modules leads to interference due to shrinking IC sizes and proximity, necessitating a method to compensate for clock signal frequency variations.
Innovation Solution
A communication apparatus with a processor that detects the ON/OFF status of adjacent wireless communications modules and thermal changes to generate indication signals, allowing for compensation of frequency drift by adjusting the oscillating frequency or system parameters, such as the divisor of a PLL circuit or the bandwidth of a loop filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple wireless communications modules are co-located in a mobile electronic device to provide different wireless services, then the device can offer more wireless communication services, but clock frequency drift occurs due to proximity and mutual influence between modules
Solution Approach 1:
The system performs preliminary detection of the ON/OFF status of adjacent wireless communication modules before frequency drift occurs. The processor detects the status of neighboring modules and proactively compensates for frequency drift by adjusting system parameters such as PLL divisor values or loop filter bandwidth, preventing the harmful effect rather than reacting after it occurs.
Solution Approach 2:
The system establishes a feedback mechanism where the processor continuously detects the ON/OFF status of adjacent wireless communication modules and uses this information to adjust system parameters. This closed-loop control compensates for frequency drift caused by module activation, maintaining clock frequency stability despite the presence of multiple wireless modules.
2Volume of moving object
If integrated circuits are shrunk to reduce device size, then the device occupies less space, but the placement distance between wireless communication modules decreases causing increased frequency drift
Solution Approach 1:
The system changes operational parameters to compensate for the reduced placement distance between modules. By detecting the ON/OFF status of adjacent modules and adjusting system parameters such as PLL divisor values or loop filter bandwidth, the system compensates for the increased frequency drift caused by close proximity, allowing small device size without sacrificing frequency stability.
3Reliability
If frequency drift compensation is implemented by detecting ON/OFF status of adjacent modules, then frequency drift can be compensated, but additional detection and processing complexity is introduced
Solution Approach 1:
The system uses the existing status information of adjacent wireless communication modules to compensate for frequency drift. By detecting the ON/OFF status of neighboring modules and using this information to adjust system parameters, the system achieves frequency drift compensation without requiring additional complex sensing or measurement mechanisms, leveraging available system information for the compensation function.
4Device complexity
If frequency drift is not compensated, then the system is simpler, but adjacent channel interference occurs causing illegal interference
Solution Approach 1:
The system applies preliminary anti-action by detecting the ON/OFF status of adjacent wireless communication modules and proactively adjusting system parameters to prevent frequency drift. This preemptive compensation stops the frequency drift before it can cause adjacent channel interference or illegal interference, eliminating the harmful effect before it occurs rather than trying to correct it afterward.
Data Source
AI summary
A communication apparatus having a first and second wireless communications modules is provided. The first wireless communications module includes a receiving unit receiving RF signals from an air interface, a signal processing module performing frequency down conversion on the RF signals to generate baseband signals according to a clock signal, and a processor processing the baseband signals. The processor further detects an ON/OFF status of the second wireless communications module to obtain a detection result and compensates for frequency drift of the clock signal according to the detection result.