High-Order PSK Signaling for Low-Power IoT Spread Spectrum
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Solution Overview
Problem
Existing low-power spread spectrum communication systems face challenges in supporting large collections of nodes with reasonable data rates while maintaining security and reducing computational complexity, particularly in IoT deployments where nodes are densely connected and intermittently powered.
Innovation Solution
The High-Order PSK Signaling (HOPS) system employs a residue number system-based sequence generator to produce time-evolving spreading sequences, enabling efficient data transmission and reception with burst-mode communications, frequency hopping, and secure multi-user channel access, using a compact, fixed-point hardware implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequence-based spread spectrum signaling techniques are used for low-power commercial standards, then large collections of nodes can operate at reasonable data rates, but computational complexity increases
Solution Approach 1:
The patent transforms the spread spectrum signal generation from complex continuous functions to discrete High-Order PSK modulation with arbitrary phase angles. By parameterizing the spreading sequences as discrete phase values (e.g., 16-PSK, 32-PSK) rather than continuous waveforms, the system achieves spread spectrum functionality with simpler digital modulation operations that are computationally efficient for low-power devices while maintaining reasonable data rates
Solution Approach 2:
The patent replaces traditional hardware-based spread spectrum signal generation (which requires complex mixers, modulators, and analog signal processing) with software-defined digital signal processing. The arbitrary-phase PSK signaling enables spread spectrum sequences to be generated and processed entirely in the digital domain, substituting mechanical/analog components with software algorithms that reduce hardware complexity and power consumption
2Reliability
If security features are enhanced between nodes, then security is improved, but implementation complexity and computational burden increase
Solution Approach 1:
The patent implements preliminary security measures by embedding authentication credentials and cryptographic keys into the spread spectrum code sequences themselves during system initialization. The arbitrary-phase PSK signaling structure allows security credentials to be pre-loaded into the spreading code generation algorithms, so that authentication and encryption are performed automatically as part of the signal generation process rather than as separate computational steps, reducing real-time implementation complexity
Solution Approach 2:
The patent merges security functions with the spread spectrum signaling mechanism by integrating authentication, encryption, and signal generation into a unified arbitrary-phase PSK framework. The spreading codes serve dual purposes: they provide the necessary signal spreading for low-power operation and simultaneously encode security credentials for node authentication, combining multiple functions into a single integrated system that reduces overall implementation complexity
3Quantity of substance
If the number of supported nodes is increased in multiple access context, then network capacity is improved, but near-far power control requirements become more stringent
Solution Approach 1:
The patent implements dynamic power control adapted to the High-Order PSK signaling structure, where transmit power levels are adjusted in real-time based on the specific phase angle sequences being transmitted and the detected interference environment. The arbitrary-phase nature of the PSK signaling allows for more granular and flexible power adjustments compared to traditional BPSK or QPSK, enabling the system to support a larger number of nodes by dynamically optimizing the power distribution across multiple active transmitters to maintain near-far balance
Data Source
AI summary
A High-Order PSK Signaling (HOPS) communications system which adapts sequence-based spread spectrum signaling techniques to the needs of low-power commercial standards. A HOPS signal generation apparatus incudes a seed calculator configured to calculate a series of seed vectors in response to a plurality of time-evolving key values wherein each of the seed vectors includes a plurality of index values calculated based upon the current key values. A sequence generator is configured to generate a series of time-evolving spreading sequences using the series of seed vectors. A modulator is operative to generate the communications signal by spreading the data signal using the spreading sequences. A transmitter transmits an analog version of the communications signal.