Physical Layer Security With Quantized Coded Signal Mapping
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Solution Overview
Problem
Wireless communications are vulnerable to unauthorized interception due to the sharing nature of wireless communication channels, and existing security techniques based on encryption schemes from higher layers lead to spectral and energy inefficiencies, high data throughput, and increased latency.
Innovation Solution
A system that implements codified amplification through quantized digital amplification and coded mapping of signal envelope samples into bandpass components, using secure mapping rules and coefficients to generate physical layer security without additional complexity or overhead, maintaining Gaussian statistical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption schemes from higher layers are used for wireless security, then security is provided, but spectral efficiency decreases and energy consumption increases
Solution Approach 1:
The patent segments the security function into two parts: (1) physical layer encoding using coded modulation schemes that embed security directly in the signal structure, and (2) higher layer encryption for additional protection. This segmentation allows the system to achieve security through the more energy-efficient physical layer operations rather than relying solely on computationally intensive higher layer encryption.
Solution Approach 2:
The patent introduces coded modulation schemes as an intermediary mechanism between the data source and the encryption layer. These coded modulation schemes (such as coset codes, lattice codes, or signal constellation modifications) act as a mediator that provides security functionality at the physical layer, reducing the burden on higher layer encryption and thereby lowering overall energy consumption.
2Reliability
If encryption schemes from higher layers are used for wireless security, then security is provided, but data throughput decreases
Solution Approach 1:
By segmenting security functionality into physical layer coded modulation and higher layer encryption, the patent enables parallel processing paths. The physical layer security operations occur during signal modulation without requiring separate encryption/decryption processing stages, thus maintaining data throughput while providing security.
Solution Approach 2:
The patent replaces the mechanical processing overhead of higher layer encryption with signal-level operations in coded modulation. Instead of requiring separate encryption algorithm execution that consumes processing time and reduces throughput, the security function is embedded directly into the modulation process, substituting computational mechanics with signal processing operations that occur naturally during transmission.
3Reliability
If encryption schemes from higher layers are used for wireless security, then security is provided, but latency increases
Solution Approach 1:
The patent performs security-related encoding operations as preliminary actions during the signal modulation process itself, rather than as separate post-processing steps. The coded modulation schemes incorporate security encoding into the constellation mapping or signal generation stage, so that security processing occurs concurrently with normal signal preparation, eliminating additional latency.
4Use of energy by moving object
If quantized digital amplification with coded mapping is used, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The patent designs the coded modulation schemes to serve multiple functions simultaneously: (1) providing security through encoded mapping, (2) improving power amplifier efficiency through constant envelope or reduced envelope variation signals, and (3) maintaining compatibility with existing wireless standards. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent achieves energy efficiency through parameter changes in the signal constellation and modulation scheme rather than through hardware modifications. By changing parameters such as constellation geometry, mapping rules, or signal envelope characteristics, the system optimizes power amplifier efficiency without requiring complex hardware redesign, thus limiting the increase in device complexity.
Data Source
AI summary
Systems and methods of performing physical layer security are presented. In one exemplary embodiment, an electronic device includes a set of amplifier circuitry operable to output a set of output signals that collectively represents an amplified sample of an input signal having information. Further, the set of output signals corresponds to a set of bandpass components that is secured by a certain physical layer security scheme and is associated with a quantized polar representation of the input signal sample.