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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| Published in: | IEEE transactions on wireless communications Vol. 8; no. 7; pp. 3372 - 3379 |
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| Main Authors: | , |
| Format: | Journal Article |
| Language: | English |
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New York, NY
IEEE
01.07.2009
Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
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| ISSN: | 1536-1276, 1558-2248 |
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| Abstract | 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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| AbstractList | 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. 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. |
| Author | Xiang-Gen Xia Zheng Li |
| Author_xml | – sequence: 1 givenname: Zheng surname: Li fullname: Li, Zheng – sequence: 2 givenname: Xiang-Gen surname: Xia fullname: Xia, Xiang-Gen |
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| Keywords | 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 |
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| Snippet | Recently, Li, Hwu and Ratazzi have proposed a physical-layer security design to guarantee low probability of interception (LPI) for MIMO systems without... 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... |
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| SubjectTerms | 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 |
| Title | A distributed differentially encoded OFDM scheme for asynchronous cooperative systems with low probability of interception |
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