FM Transmitter Priority Control for Wireless Coexistence
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Solution Overview
Problem
Interference between different wireless technologies coexisting in mobile devices, such as FM transmission systems and other wireless networking systems, leads to saturation of receivers and reliability issues due to out-of-band transmissions and harmonics, making simultaneous operation problematic.
Innovation Solution
A mobile wireless device with an FM system and a wireless networking system that includes a priority controller to manage operational priorities and reduce interference by disabling or modifying the FM transmitter based on the activity of the wireless networking system and the presence of a modulating signal, ensuring that the system with higher priority operates without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the FM transmitter operates continuously, then audio data transfer is maintained, but interference saturates the receiver of other wireless systems in the device
Solution Approach 1:
The FM transmitter dynamically adjusts its operational state between active and disabled based on real-time detection of modulating signal presence. This dynamic adaptation allows the system to maintain audio data transfer when needed while eliminating interference when the FM signal is not actively modulated, thus resolving the contradiction between continuous operation and interference prevention
Solution Approach 2:
The system implements feedback by continuously monitoring the modulating signal input to the FM transmitter. When the feedback detection indicates absence of modulation (below threshold), the transmitter is automatically disabled. This closed-loop control ensures the transmitter only operates when actual audio data needs transmission, preventing unnecessary interference with other wireless systems
2Adaptability or versatility
If multiple wireless technologies are colocated in a mobile device, then device functionality is enhanced, but out-of-band transmissions and harmonics cause receiver saturation
Solution Approach 1:
The system takes preliminary action by detecting the presence or absence of a modulating signal before the FM transmitter can generate harmful out-of-band emissions or harmonics. By proactively disabling the transmitter when no modulation is detected, the system prevents interference before it occurs, protecting the reliability of colocated wireless receivers while maintaining device versatility
Solution Approach 2:
The invention extracts and removes the harmful component (FM transmitter operation) from the system when it is not needed for its primary function (audio data transfer). By selectively taking out the transmitter operation based on modulation detection, the system eliminates the source of interference (out-of-band emissions and harmonics) while preserving the ability to restore functionality when required
Data Source
AI summary
A system and method for operating an FM system and wireless networking system coexistent in a mobile wireless device. A mobile wireless device includes a frequency modulation (“FM”) system that includes an FM transmitter and, optionally, an FM receiver. The mobile wireless device also includes a wireless networking system having a network receiver. The FM system is configured to disable the FM transmitter if an amplitude of a modulating signal provided to the FM transmitter is below a predetermined threshold.