Antenna Sharing System for WLAN and Bluetooth Coexistence
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Solution Overview
Problem
The coexistence of WLAN and Bluetooth wireless communication services sharing a single antenna leads to interference issues due to their overlapping frequency spectrum, resulting in performance degradation, particularly affecting WLAN throughput.
Innovation Solution
A system comprising an antenna, switching devices, and a controller that manages signal transmission and reception paths to attenuate and prioritize signals, ensuring coexistence by controlling switching devices and connection devices like attenuators, directional couplers, or power dividers to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If WLAN and Bluetooth modules share a single antenna to reduce cost and space, then device complexity is reduced, but interference occurs between the two modules due to overlapping frequency spectrum
Solution Approach 1:
A switching device is introduced as an intermediary component between the single antenna and the WLAN/Bluetooth modules. This switching device dynamically connects the antenna to different modules based on which module is currently active, preventing direct interference between the two modules while allowing them to share the same antenna resource.
Solution Approach 2:
The system dynamically switches the connection between the antenna and different wireless modules based on operational requirements. The switching device changes its state to connect the antenna to either the WLAN module or Bluetooth module as needed, enabling flexible resource allocation and preventing simultaneous interference.
2Productivity
If WLAN and Bluetooth operate simultaneously on overlapping frequencies, then communication efficiency is improved, but interference degrades performance
Solution Approach 1:
The system uses periodic time-division multiplexing where the switching device alternates between connecting to WLAN and Bluetooth modules in scheduled time slots. This periodic switching allows both modules to operate efficiently at different times while preventing simultaneous interference, maintaining both productivity and reliability.
3Reliability
If Bluetooth is prioritized for real-time audio transmission, then reliability of audio communication is improved, but WLAN throughput is degraded
Solution Approach 1:
The switching device is configured to preemptively connect to the Bluetooth module when audio transmission is detected, allocating the antenna resource to Bluetooth before WLAN operations begin. This preliminary action ensures that real-time audio communication receives priority access to the antenna, maintaining audio reliability while WLAN operations are scheduled during Bluetooth idle periods.
Data Source
AI summary
A system for the coexistence between a plurality of wireless communication modules sharing a single antenna includes an antenna, first and second transceiving paths, and first and second wireless communications modules. The first wireless communications module is coupled to a first transceiving path and transmits or receives first wireless signals via the first transceiving path. The second wireless communications module is coupled to the second transceiving path and transmits and receives second wireless signals via the first and the second transceiving paths, wherein signal strengths of the second wireless signals passing through the second transceiving path are attenuated by a certain level, and the attenuated second wireless signals are added to the first wireless signals when passing through the first transceiving path, wherein one of the first and the second communications module is a LTE module and the other one is a WLAN module.