Spatial Interleaving for Low-Latency Wireless Security

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Modern wireless communication systems lack inherent security features, and existing encryption methods in higher layers are slow and complex, with traditional systems like Time-Domain Interleaving introducing significant delays and lacking space diversity.

Innovation Solution

A physical-layer security system using spatial interleaving across multiple-input multiple-output (MIMO) antennas with a secret key for OFDM symbols, providing enhanced security and diversity without additional delay, and utilizing software-defined radio units for encryption and decryption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If higher layer encryption algorithms are implemented, then data security is achieved, but processing speed decreases and complexity increases

Engineering Contradiction:

Improvedata securityVSAvoidprocessing speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent moves the encryption operation from the time domain to the spatial domain by applying different permutation patterns across multiple antennas. This dimensional shift allows parallel processing of encrypted signals across spatial channels, achieving both security and high processing speed suitable for broadband systems

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If Time-Domain Interleaving with long interleaver is used, then security and diversity are provided, but system delay increases significantly

Engineering Contradiction:

ImprovesecurityVSAvoidsystem delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent transitions from time-domain interleaving to spatial-domain interleaving across multiple antennas. This allows the system to achieve security and diversity without requiring long time-domain interleavers, thereby reducing system delay while maintaining reliability

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent divides the encryption process into multiple spatial segments across different antennas, each applying different permutation patterns. This segmentation enables shorter interleaver lengths per antenna while collectively providing strong security, reducing the overall system delay

Inventive Principle:

Principle #1Segmentation

3Reliability

If Frequency or Time domain scrambling is applied, then security is provided, but space diversity is absent

Engineering Contradiction:

ImprovesecurityVSAvoidspace diversity

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent applies scrambling in the spatial domain across multiple antennas rather than in frequency or time domains. This spatial-domain approach inherently provides space diversity while maintaining security, as each antenna transmits differently scrambled versions of the data

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS10855450B1Secured and robust wireless communication system for low-latency applications

Publication Date: 2020.12.01 DESC DUBAI ELECTRONICS SECURITY CENT

AI summary

There is provided a physical layer security (PLS) system for enhanced cryptographic security and diversity of transmitted data, the system comprising a transmitter for first, converting the data into a plurality of OFDM symbols; second, multiplexing the plurality of OFDM symbols into parallel M OFDM streams; and third, performing spatial interleaving (SI) on the parallel M OFDM streams using a secret key. The system further comprises a receiver for receiving and de-scrambling the transmitted plurality of data samples, wherein software-defined radio (SDR) units are used as the system transmitter and receiver.