Intra-Aircraft CDMA Sensor Network for Wireless Interference Immunity
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Solution Overview
Problem
Existing wireless sensor networks in aircraft face challenges with data rate limitations and interference from co-existing wireless technologies like Wi-Fi and Bluetooth, impacting the quality of service, throughput, and latency in critical monitoring applications.
Innovation Solution
Implementing a CDMA-based physical layer with synchronous CDMA codes and a restructured channel schema, using 40 MHz channels and Software Defined Radio (SDR) to manage interference and enhance data transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wireless sensor networks are used in aircraft, then installation is simpler and weight is reduced, but data transmission rates are limited and interference from co-existing wireless technologies occurs
Solution Approach 1:
The patent segments the wireless communication spectrum into dedicated channels for different wireless technologies. The CDMA-based IAWSN uses specific frequency channels that are separated from Wi-Fi and Bluetooth bands, allowing simultaneous operation without interference. This spectral segmentation enables high data transmission rates while avoiding harmful interference from co-existing wireless systems.
Solution Approach 2:
The patent introduces CDMA (Code Division Multiple Access) as an intermediary technology that enables multiple wireless systems to coexist. By using unique spreading codes for different sensor nodes and wireless technologies, CDMA acts as a mediator that allows simultaneous transmissions without mutual interference, thus improving data rates while managing interference from Wi-Fi and Bluetooth.
2Adaptability or versatility
If multiple wireless technologies coexist in the aircraft, then functionality and adaptability are improved, but interference and quality of service degradation occur
Solution Approach 1:
The patent implements a universal CDMA-based communication framework that can accommodate multiple wireless sensor nodes and different types of sensors simultaneously. The system uses a common set of spreading codes and channel access mechanisms that work across diverse sensor types and locations, enabling network scalability while maintaining consistent quality of service through unified interference management.
Solution Approach 2:
The patent changes the fundamental communication parameters by adopting CDMA modulation and spreading codes. This parameter change transforms the communication approach from traditional frequency or time division to code division, allowing the network to scale to many nodes while maintaining reliability. The spreading code parameters are designed to provide orthogonal or near-orthogonal separation between nodes, ensuring consistent quality of service even as the network expands.
3Reliability
If wired sensors are used for monitoring, then reliability and data transmission stability are ensured, but system complexity and weight increase
Solution Approach 1:
The patent replaces the mechanical wiring system with a wireless CDMA-based communication system. Instead of physical cables connecting sensors to the monitoring system, the invention uses radio frequency transmissions with CDMA modulation. This substitution eliminates the mechanical complexity of wiring while maintaining monitoring reliability through the robustness of CDMA technology, which provides stable data transmission even in the presence of interference.
Data Source
AI summary
A code-division multiple-access (CDMA) based Intra-Aircraft Wireless Sensor Network (IAWSN) configured for structural health monitoring comprises a network of sensor nodes configured as source nodes to transmit sensor data in accordance with a CDMA technique and a wireless data concentrator (WDC) to receive the sensor data simultaneously from at least some of the sensor nodes. Each of the sensor nodes is assigned a synchronous CDMA code for spreading the sensor data and uniquely identifying transmissions from each sensor node. The WDC may use the synchronous CDMA codes to despread the simultaneously received sensor data and identify the particular sensor node from which the sensor data is received. The synchronous CDMA codes serve as a unique identifier of the sensor nodes, as well as provide for improved immunity from interference.