Wireless Stereo Audio Relay Using Spatial Diversity Under Fading
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Solution Overview
Problem
In complex interference and fading environments, especially during long-distance transmission with occlusion, existing Bluetooth audio data transmission protocols like CIS and BIS struggle to maintain communication quality and reliability due to limited transmission times.
Innovation Solution
The method involves one audio data receiving device starting to receive and forward audio data to another device when communication quality falls below a preset requirement, utilizing spatial diversity to ensure both devices receive audio data, even if one has poor reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If audio data is transmitted with a limited number of times within a fixed communication interval, then low latency and synchronization are improved, but communication quality and reliability deteriorate in complex interference and fading environments
Solution Approach 1:
The patent introduces a spatial dimension to the transmission system by deploying multiple transmitting devices at different locations. Each device transmits the same audio data, creating multiple spatial paths for signal propagation. This spatial diversity allows the receiving device to select or combine signals from different paths, overcoming fading and interference that affect individual paths while maintaining low latency through synchronized transmission.
Solution Approach 2:
The patent changes the transmission parameter from single-device to multi-device simultaneous transmission. By coordinating multiple transmitting devices to send identical audio data within the same communication interval, the system increases signal redundancy and reliability without extending the overall transmission time, thus maintaining low latency while improving communication quality in challenging environments.
2Reliability
If the number of transmission times is increased to improve communication quality, then reliability is improved, but latency increases and synchronization performance deteriorates
Solution Approach 1:
Instead of increasing the number of transmission time slots, the patent adds spatial diversity by using multiple transmitting devices simultaneously. This approach provides transmission redundancy through spatial paths rather than temporal repetition, maintaining the fixed communication interval and low latency while achieving improved reliability through parallel spatial transmission channels.
3Device complexity
If single-device transmission is used, then device complexity is reduced, but communication reliability deteriorates in long-distance transmission with occlusion
Solution Approach 1:
The patent merges multiple transmitting devices into a coordinated transmission system where each device sends identical audio data simultaneously. This combination of multiple independent transmission paths creates redundancy that overcomes long-distance fading and occlusion effects. The receiving device combines or selects signals from multiple sources, achieving high reliability without requiring complex individual device functionality.
4Reliability
If multiple transmitting devices are deployed, then communication reliability is improved through spatial diversity, but device complexity and system coordination requirements increase
Solution Approach 1:
Each transmitting device in the system is designed with universal functionality to transmit audio data according to the same protocol and timing requirements. This multi-functionality approach allows any device in the network to serve as a transmitting device, simplifying individual device design while achieving system-level reliability through the collective action of multiple identical-functional devices working in coordination.
Data Source
AI summary
An audio data transmission method, an audio data transmission system, and an audio data transmission device are described. The audio data transmission method comprises: receiving first channel audio data from an audio source device based on a wireless communication protocol by a first audio data receiving device, receiving second audio channel audio data from the audio source device based on the wireless communication protocol by a second audio data receiving device, starting to receive the first channel audio data and the second channel audio data by one of the first and second audio data receiving devices when a communication quality between the audio source device and another one of the first and second audio data receiving devices fails to meet a preset requirement; and forwarding the first or second channel audio data from the one of the first and second audio data receiving devices to the another one of the first and second audio data receiving device. Thus, the present invention utilizes characteristics of independent fading at different spatial positions, improves reliability of wireless communication and enhances communication quality through a spatial diversity gain.