Beacon Channel Security via Code Division Multiplexing
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Solution Overview
Problem
Current beacon channel protection schemes using time division multiplexing (TDM) make it relatively easy for unintended recipients to detect and access sensitive information necessary for decoding the traffic channel, compromising security.
Innovation Solution
Implementing code division multiplexing (CDM) on both the beacon and traffic channels, where the beacon channel is transmitted at a lower power level, making it difficult to detect and hiding it under the traffic channel, while including necessary information for decoding the traffic channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division multiplexing (TDM) is used to transmit the beacon channel, then the beacon channel can provide critical information for decoding the traffic channel, but the beacon channel becomes relatively easy to detect and access by unintended recipients
Solution Approach 1:
The patent changes the multiplexing parameter from time-division to code-division, and changes the power parameter of the beacon channel to be lower than the traffic channel. This allows the beacon channel to be transmitted simultaneously with the traffic channel but remain hidden underneath it, providing both reliable information delivery and security against unintended access.
Solution Approach 2:
The patent introduces a new dimension of security by using code division multiplexing with distinct spreading codes for the beacon and traffic channels. This allows the receiver to selectively decode either channel by applying the appropriate code, while unintended recipients cannot extract information from either channel without knowing the specific codes.
2Object-affected harmful factors
If the beacon channel is transmitted at a lower power level to hide it under the traffic channel, then security is improved, but the beacon channel signal strength is reduced
Solution Approach 1:
The patent replaces the traditional approach of increasing beacon channel power to ensure reliable reception with code division multiplexing and spreading techniques. The lower power beacon channel signal is spread across a wider bandwidth, and the receiver uses correlation with the known spreading code to recover the signal, effectively substituting power-based reliability with code-based signal recovery.
3Object-affected harmful factors
If code division multiplexing (CDM) is used to spread the bandwidth of the traffic channel, then the beacon channel can be hidden underneath, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining and distributing the spreading codes to both transmitter and receiver before actual data transmission. The beacon channel spreading code is made known to legitimate receivers in advance, allowing them to directly correlate and decode the beacon channel without complex iterative processing, thereby reducing operational complexity while maintaining security.
Data Source
AI summary
The present invention is generally directed to using code division multiplexing (CDM) on the beacon and traffic channels while lowering the power of the beacon channel so that it rides under the traffic channel and becomes very difficult to detect. In this way, the beacon channel can contain sensitive information for decoding the traffic channel while remaining hidden from unintended recipients. By hiding the beacon channel, the CDM technique can be particularly beneficial in adaptive waveform systems where sensitive traffic channel acquisition information is regularly transmitted to the receiver.