Multimode Bluetooth Transceiver Using Spread-Spectrum Modulation
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Solution Overview
Problem
Mesh networks using Bluetooth protocol face limitations in transmission distance and interference, leading to reduced communication reliability and sensitivity, especially when hop distances are large.
Innovation Solution
Implementing multimode receiving and transmitting devices that convert and modulate Bluetooth data packets using spread-spectrum modulation schemes, allowing for enhanced performance and compatibility with Bluetooth standards, while utilizing multimode transceiving methods to manage data packets with varying spreading lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Bluetooth protocol is used for mesh network communication, then device compatibility and ease of operation are improved, but transmission distance and communication reliability deteriorate
Solution Approach 1:
The patent applies parameter changes by transitioning from standard Bluetooth modulation to spread-spectrum modulation schemes. This changes the fundamental transmission parameters (modulation type, spectral distribution) to achieve extended transmission distance and improved reliability while maintaining Bluetooth protocol compatibility at higher layers. The spread-spectrum approach distributes signal energy across a wider frequency band, improving resistance to interference and extending range.
Solution Approach 2:
The patent implements multi-functionality by designing a receiving device that can handle both standard Bluetooth packets and spread-spectrum enhanced packets. The demodulation circuit is configured to support multiple demodulation schemes, allowing the same hardware platform to operate in both conventional Bluetooth mode and enhanced spread-spectrum mode, thus maintaining compatibility while gaining improved performance.
2Adaptability or versatility
If Bluetooth protocol is used for mesh network communication, then device compatibility is improved, but transmission distance and sensitivity deteriorate
Solution Approach 1:
The patent changes the modulation parameter from standard Bluetooth to spread-spectrum modulation, which fundamentally alters how the signal is transmitted. This parameter change enables the transmission distance to be extended while maintaining compatibility with Bluetooth devices, as the spread-spectrum signal can be detected with higher sensitivity even at longer distances.
Solution Approach 2:
The patent introduces spread-spectrum modulation as an intermediary layer between the Bluetooth protocol and the physical transmission medium. This intermediary technique allows Bluetooth-compatible devices to communicate over longer distances by embedding the Bluetooth data packets within spread-spectrum signals that have superior propagation characteristics and resistance to path loss.
3Reliability
If spread-spectrum modulation is implemented, then communication sensitivity and reliability are improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the receiving device into distinct functional modules: a receiving circuit for signal acquisition, a demodulation circuit for signal processing, and a packet processing unit for data extraction. This modular segmentation allows the complex spread-spectrum demodulation function to be implemented in a structured way, making the complexity manageable and the device easier to manufacture and maintain.
Solution Approach 2:
The patent reduces device complexity by designing a universal demodulation circuit that can handle both standard Bluetooth packets and spread-spectrum enhanced packets. By configuring the demodulation circuit to support multiple schemes, the patent avoids the need for separate hardware for each mode, thus reducing overall device complexity while maintaining improved communication sensitivity.
4Length of stationary object
If spread-spectrum modulation is implemented, then transmission distance is extended, but device complexity increases
Solution Approach 1:
The patent segments the device architecture into modular components, allowing the spread-spectrum modulation and demodulation functions to be added as distinct modules rather than redesigning the entire system. This segmentation enables extended transmission distance while keeping the base Bluetooth functionality intact, making the complexity addition minimal and manageable.
Solution Approach 2:
The patent implements a universal receiving device that can operate in both standard Bluetooth mode and spread-spectrum enhanced mode. This multi-functionality allows the device to achieve extended transmission distance when needed while maintaining compatibility with standard Bluetooth devices, avoiding the need for completely separate hardware systems and thus controlling device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves communication sensitivity and reliability in mesh networks by extending transmission distance and reducing interference, maintaining compatibility with Bluetooth standards with minimal modifications to existing circuits.
Implementation Method 1
a receiving circuit configured to convert a received radio frequency signal to a baseband modulated signal
Implementation Method 2
a demodulation circuit configured to select a demodulation scheme that conforms to a Bluetooth standard or one of a plurality of despread demodulation schemes, in order to demodulate the baseband modulated signal
Data Source
AI summary
A multimode receiving device configured to receive a standard Bluetooth data packet and a physical layer data packet with enhanced performance, can include: a receiving circuit configured to convert a received radio frequency signal to a baseband modulated signal; a demodulation circuit configured to select a demodulation scheme that conforms to a Bluetooth standard or one of a plurality of despread demodulation schemes, in order to demodulate the baseband modulated signal; and the plurality of despread demodulation schemes being configured to correspond to a plurality of predetermined spread-spectrum modulation schemes.