A distributed differentially encoded OFDM scheme for asynchronous cooperative systems with low probability of interception

Recently, Li, Hwu and Ratazzi have proposed a physical-layer security design to guarantee low probability of interception (LPI) for MIMO systems without relying on upper layer data encryption. The proposed scheme utilizes antenna array redundancy to deliberately randomize the transmitted signals to...

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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 8; no. 7; pp. 3372 - 3379
Main Authors: Li, Zheng, Xia, Xiang-Gen
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.07.2009
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Antenna arrays
Antennas
Applied sciences
asynchronous asynchronous security
Coding, codes
Cooperative systems
Cryptography
Data encryption
Data security
Differential space-time-frequency coding
Eavesdropping
Encoding
Exact sciences and technology
Frequency domain analysis
Frequency domains
Information, signal and communications theory
Interception
low probability of interception
MIMO
Multiplexing
OFDM
Orthogonal Frequency Division Multiplexing
Radiocommunications
Randomization
Redundancy
Signal and communications theory
Telecommunications
Telecommunications and information theory
Time measurements
Timing
Transmitting antennas
Space-time codes
Relay
OFDM
Encryption
Subcarrier
low probability of interception
Eavesdropping
asynchronous cooperative diversity
Randomization
Coding
Security of data
Antenna array
Telecommunication security
MIMO system
Redundancy
Space diversity
Cooperative systems
Frequency domain method
Decoding
Information transmission
Spatial frequency
wireless security
Orthogonal frequency division multiplexing
unitary codes
Frequency diversity
Discrete signal
Differential space-time-frequency coding
Timing
Differential method
ISSN:1536-1276, 1558-2248
Online Access:Get full text
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Summary:Recently, Li, Hwu and Ratazzi have proposed a physical-layer security design to guarantee low probability of interception (LPI) for MIMO systems without relying on upper layer data encryption. The proposed scheme utilizes antenna array redundancy to deliberately randomize the transmitted signals to prevent eavesdropping. Motivated by their idea, in this paper we design a physical-layer transmission scheme to achieve LPI in cooperative systems. There are two major differences in cooperative systems: (1) each relay node may have only one antenna that can not provide antenna array redundancy for signal randomization; (2) there may exist timing errors due to the asynchronous nature of cooperative systems. Considering the two differences, we propose a distributed differentially encoded OFDM transmission scheme with deliberate signal randomization to prevent eavesdropping and exploit the available spatial and frequency diversities in asynchronous cooperative systems. We use diagonal unitary codes to perform the differential encoding in the frequency domain over subcarriers within each OFDM block, or we use general (not necessarily diagonal) unitary codes to perform the differential encoding in the frequency domain across several OFDM blocks. By some deliberate signal randomization, the eavesdropper can not detect the transmitted symbols, while the authorized receiver can perform differential decoding successfully without the knowledge of the channels or the timing errors.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2009.080365