SDR BLOS Waveform Spreading Factor and Channel Segmentation
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Solution Overview
Problem
Current tactical satellite communication (SATCOM) waveforms lack robustness and covertness against jamming and detection, particularly in contested environments, due to limitations in spreading factors and channel usage.
Innovation Solution
A software-defined radio (SDR) system configured to communicate over multiple channels using a beyond line of sight (BLOS) waveform with spreading factors greater than 256, enabling simultaneous transmission and reception of encrypted communications, and supporting multiple users with increased robustness and data rate capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spreading factors (≤256) are used in tactical SATCOM waveforms, then device complexity is reduced, but robustness against jamming and detection is insufficient
Solution Approach 1:
The patent changes the spreading factor parameter from conventional values (≤256) to extended values (>256, specifically 512, 1024, 2048). This parameter change directly increases processing gain and robustness against jamming while the system manages the associated complexity through efficient implementation in the SDR architecture.
2Productivity
If single-channel communication is used, then device complexity is reduced, but data rate and communication reliability are limited
Solution Approach 1:
The patent divides the communication system into multiple independent channels (Channel 0, Channel 1, etc.), each capable of simultaneous operation. This segmentation allows the system to achieve higher aggregate data rates and improved reliability through diversity, while the SDR architecture manages channel complexity through software-based resource allocation and synchronization.
3Difficulty of detecting and measuring
If conventional waveforms are used, then ease of operation is maintained, but covertness and anti-detection capability are insufficient
Solution Approach 1:
The patent extends the spreading factor into higher dimensional space (beyond the conventional 256 limit to 512, 1024, 2048), which increases the processing gain and spreads the signal energy more densely. This dimensional extension improves covertness by making the signal harder to detect and distinguish from background noise, while the SDR platform maintains ease of operation through software-defined waveform management.
Data Source
AI summary
A system may include a software-defined radio (SDR) configured to communicate over multiple channels by using a beyond line of sight (BLOS) waveform. The SDR may be configured to transmit encrypted communications over some or all of the multiple channels to a satellite and on to at least one radio access node (RAN). The SDR may be configured to receive encrypted communications over some or all of the multiple channels from the at least one RAN via the satellite. At least one of the multiple channels may use a spreading factor greater than 256. The SDR may be configured to simultaneously transmit and receive encrypted communications over the multiple channels.