Optical Body Area Network With 2D CDMA and Time-Delay Security
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Solution Overview
Problem
Current optical body area networks (OBANs) lack a comprehensive method to integrate two-dimensional spatial/spectral double weight zero cross-correlation codes with time-delay techniques for secure and efficient transmission of medical sensor data over free space optical channels, particularly in remote health monitoring applications, and existing 2D SAC-OCDMA codes are inefficient due to complex designs and limited capacity.
Innovation Solution
An optical body area network system utilizing a 2D spectral/spatial double weight zero cross-correlation (DW-ZCC) code with time-delay techniques for encoding and decoding optical signals, combined with a transmitter and receiver telescope for secure transmission over free space optical channels, and a bit error rate estimator for quality control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 2D SAC-OCDMA codes are used for encoding optical signals in OBAN, then the transmission capacity and security are improved, but the code design complexity and system implementation difficulty increase
Solution Approach 1:
The patent segments the 2D spectral/spatial code into two independent 1D code sequences (spectral code and spatial code). Each sequence can be designed and generated separately, reducing the overall design complexity while maintaining the high capacity benefits of 2D coding. The encoder and decoder processes are correspondingly divided into spectral and spatial processing stages.
Solution Approach 2:
The patent transitions from traditional 1D optical codes to 2D spectral/spatial codes by adding a spatial dimension to the spectral coding. This dimensional expansion enables significantly higher transmission capacity and security without requiring entirely new design methodologies, as the 2D code is constructed from established 1D code sequences.
2Reliability
If time-delay techniques are integrated with 2D spectral/spatial coding, then the security against eavesdropping is improved, but the system complexity and synchronization requirements increase
Solution Approach 1:
The patent merges time-delay encoding with the 2D spectral/spatial coding scheme by combining multiple encoded optical signals with different time delays into a single composite signal for transmission. The receiver performs corresponding time-delay compensation and decoding operations to recover individual signals. This integration enhances security against eavesdropping while utilizing existing optical components.
3Adaptability or versatility
If RF technology is used for BAN communication, then the infrastructure and standardization are established, but electromagnetic interference and health concerns arise
Solution Approach 1:
The patent replaces RF electromagnetic communication with optical communication using visible light or infrared light beams. This substitution eliminates electromagnetic interference and health concerns associated with RF radiation, while the free-space optical channel provides a well-established communication paradigm with mature standards and technologies for light transmission and detection.
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
The system ensures secure, reliable, and efficient transmission of patient health data, offering high capacity, immunity to electromagnetic interference, and cost-effective solutions for remote health monitoring, addressing the limitations of RF-based OBANs.
Implementation Method 1
The intra-body or extra-body communication in OBANs is facilitated through light beams in the visible or IR range that are modulated with medical sensor data
Data Source
AI summary
The present disclosure relates to an optical body area network (OBAN) comprising a plurality of on-body optical sensors each configured to generate optical signals based on respective measurements. An optical coordinator receives, spectrally and spatially encodes, time-delays, and combines these signals into a single optical data stream, which is then amplified. A transmitter telescope transmits this amplified stream over a free space optical channel to a receiver telescope. An optical decoder splits the received stream into four equal data streams, applies a decoding time delay, and spatially and spectrally decodes the four decoded equal data streams according to a 2D spatial/spectral double weight zero cross-correlation decode sequence, generating eight decoded optical signals. The OBAN includes a low pass filter to filter the decoded signals and a bit error rate (BER) estimator to perform BER measurements on the decoded signals.