Non-regenerative two-hop wiretap channels using interference neutralization

Gerbracht, Sabrina; Jorswieck, Eduard A.; Zheng, Gan; Ottersten, Björn

doi:10.1109/wifs.2012.6412659

Cited by 3 publications

(6 citation statements)

References 17 publications

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“…Denote the non-zero columns of P i byP i ∈ C M ×S i . The information leakage constraint (21) is equivalent to For each i, we stack the constrains for all j = i by using G H −i from (18) We write (34) as…”

Section: Secrecy Rates With Larger Systemsmentioning

confidence: 99%

“…Stacking the matrices in (34) for all i, we obtain A vec(R) = b. The matrix A is a block matrix with vertically stacked blocks P T i F T i ⊗ G H −i , for i = 1, .…”

Section: Proof Of Propositionmentioning

confidence: 99%

“…IN has been applied to eliminate interference in various single-carrier systems, such as deterministic channels [29], [30], two-hop relay channels [23], [31], [32] and instantaneous relay channels [33]. Our prior work shows that IN is effective in improving secrecy rates in a two-hop wiretap channel [34].…”

Section: Introductionmentioning

confidence: 99%

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Information Leakage Neutralization for the Multi-Antenna Non-Regenerative Relay-Assisted Multi-Carrier Interference Channel

Jorswieck

Engelmann

2013

IEEE J. Select. Areas Commun.

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In heterogeneous dense networks where spectrum is shared, users privacy remains one of the major challenges. On a multi-antenna relay-assisted multi-carrier interference channel, each user shares the frequency and spatial resources with all other users. When the receivers are not only interested in their own signals but also in eavesdropping other users' signals, the cross talk on the frequency and spatial channels becomes information leakage. In this paper, we propose a novel secrecy rate enhancing relay strategy that utilizes both frequency and spatial resources, termed as information leakage neutralization. To this end, the relay matrix is chosen such that the effective channel from the transmitter to the colluding eavesdropper is equal to the negative of the effective channel over the relay to the colluding eavesdropper and thus the information leakage to zero. Interestingly, the optimal relay matrix in general is not block-diagonal which encourages users' encoding over the frequency channels. We proposed two information leakage neutralization strategies, namely efficient information leakage neutralization (EFFIN) and optimized information leakage neutralization (OPTIN). EFFIN provides a simple and efficient design of relay processing matrix and precoding matrices at the transmitters in the scenario of limited power and computational resources. OPTIN, despite its higher complexity, provides a better sum secrecy rate performance by Fig. 1. Three overlapping LTE cells. The sum secrecy rates over the cells can be improved if a smart multi-antenna relay is introduced into the system. The emphasized arrows from BS 1 to the smart relay in the middle and then to UE 1 illustrate that desired signal strength (together with the direct channel path in red) can be boosted by choosing an appropriate relay strategy. The emphasized arrows from BS 2 to the smart relay and then to UE 1 illustrate that information leakage (shown by a dashed arrow in blue) can be neutralized by choosing the relay strategy appropriately.optimizing the relay processing matrix and the precoding matrices jointly. The proposed methods are shown to improve the sum secrecy rates over several state-of-the-art baseline methods.

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Section: Secrecy Rates With Larger Systemsmentioning

confidence: 99%

“…Stacking the matrices in (34) for all i, we obtain A vec(R) = b. The matrix A is a block matrix with vertically stacked blocks P T i F T i ⊗ G H −i , for i = 1, .…”

Section: Proof Of Propositionmentioning

confidence: 99%

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Information Leakage Neutralization for the Multi-Antenna Non-Regenerative Relay-Assisted Multi-Carrier Interference Channel

Jorswieck

Engelmann

2013

IEEE J. Select. Areas Commun.

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“…With symbol extensions, aligned interference neutralisation, a mix of alignment and neutralisation, can be applied [6]. Our prior works show that signal leakage neutralisation is effective in improving secrecy rates in a conventional four‐node set‐up and multi‐carrier relay‐assisted interference channel (IRC) [40, 41]. In our prior works, perfect channel state information (CSI) is assumed to be available at all nodes.…”

Section: Introductionmentioning

confidence: 99%

Signal leakage neutralisation in instantaneous non‐regenerative relaying networks under channel uncertainty

Jorswieck

2014

IET Communications

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“…IN has been applied to eliminate interference in various systems [13,18,19] including instantaneous relay channels [20]. Our prior work shows that IN is effective in improving secrecy rates in a two-hop wiretap channel [21]. The proposed method in this paper differs The wireless relay-assisted network with layer one repeaters and one smart relay is shown in subfigure (a).…”

Section: Introductionmentioning

confidence: 99%

Efficient information leakage neutralization on a relay-assisted multi-carrier interference channel

Jorswieck

Gerbracht

2013

2013 IEEE International Conference on Acoustics, Speech and Signal Processing

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In heterogeneous dense networks where spectrum is shared, users privacy remains one of the major challenges. When the receivers are not only interested in their own signals but also in eavesdropping other users' signals, the cross talk becomes information leakage. We propose a novel and efficient secrecy rate enhancing relay strategy EFFIN for information leakage neutralization. The relay matrix is chosen such that the effective leakage channel (spectral and spatial) is zero. Thus, it ensures secrecy regardless of receive processing employed at eavesdroppers and does not rely on wiretaps codes to ensure secrecy, unlike other physical layer security techniques such as artificial noise. EFFIN achieves a higher sum secrecy rate over several state-of-the-art baseline methods.

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Non-regenerative two-hop wiretap channels using interference neutralization

Cited by 3 publications

References 17 publications

Information Leakage Neutralization for the Multi-Antenna Non-Regenerative Relay-Assisted Multi-Carrier Interference Channel

Information Leakage Neutralization for the Multi-Antenna Non-Regenerative Relay-Assisted Multi-Carrier Interference Channel

Signal leakage neutralisation in instantaneous non‐regenerative relaying networks under channel uncertainty

Efficient information leakage neutralization on a relay-assisted multi-carrier interference channel

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