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International Workshop on High Mobility Wireless Communications (HMWC)

Security-reliability tradeoff for secure wireless communications with channel estimation error

Gongpu Wang, Yulong Zou, Feifei Gao, Zhangdui D. Zhong

Published Nov 1, 2013• 2 citations
Publisher

Abstract

In this paper, we identify and analyze the tradeoff between security and reliability for wireless communications in the presence of eavesdropping attack. Typically, we assume that both destination and the eavesdropper can only obtain channel state information with estimation errors, instead of perfect channel estimation predominantly assumed in the literature. Linear minimum mean-square error estimation (LMMSE) is performed and the expressions for data throughput of the main link and the wiretap link are derived considering estimation errors. Next the probability that an outage event occurs over the main link, named outage probability, is given to represent the reliability. Meanwhile, the probability that an eavesdropper succeeds in intercepting the source signal, called intercept probability, is found to measure the security. Based on these, the security-reliability tradeoff performance is analyzed and it is shown that the transmission security (reliability) can be improved by loosening the reliability (security) requirement. Simulations are then provided to corroborate the proposed studies.

DOI
10.1109/hmwc.2013.6710314

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In this paper, we identify and analyze the tradeoff between security and reliability for wireless communications in the presence of eavesdropping attack. Typically, we assume that both destination and the eavesdropper can only obtain channel state information with estimation errors, instead of perfect channel estimation predominantly assumed in the literature. Linear minimum mean-square error estimation (LMMSE) is performed and the expressions for data throughput of the main link and the wiretap link are derived considering estimation errors. Next the probability that an outage event occurs over the main link, named outage probability, is given to represent the reliability. Meanwhile, the probability that an eavesdropper succeeds in intercepting the source signal, called intercept probability, is found to measure the security. Based on these, the security-reliability tradeoff performance is analyzed and it is shown that the transmission security (reliability) can be improved by loosening the reliability (security) requirement. Simulations are then provided to corroborate the proposed studies.
In this work, a two-phase optimal-relay transmission scheme for relay networks against eavesdropper is proposed. The security and the reliability performance of this scheme are evaluated in the form of the intercept probability and the outage probability, respectively. In addition, the closed-form expression of security-reliability tradeoff (SRT) is obtained to show the compromise of the security and reliability performance of the system. Specifically, instead of common assumptions of perfect global channel state information in most literature, the channel estimation error and its effects on performance analysis are considered in this paper. It is shown that the security (or reliability) can be enhanced by degrading the reliability (or security) requirement, and the performance can be improved by increasing the number of relays. Finally, simulation results are provided to corroborate our proposed studies.
In this paper, we investigate the physical-layer security for a wireless two-hop relay network in the presence of channel estimation errors when estimating the channel state information (CSI) of the main links (from the source via relays to the destination) and wiretap links (from the source and relays to the eavesdropper). The eavesdropper can not only overhear the confidential signals transmitted by the relays, but also tap the secret messages transmitted by the source. We present an channel estimation error oriented relay selection (CEEoRS) scheme to improve the security-reliability tradeoff (SRT). We also analyze the intercept probability and outage probability of the CEEoRS scheme, where the intercept probability and outage probability can quantify the security and reliability, respectively. For comparison purposes, the traditional direct transmission with channel estimation errors (TDTwCEE) is also analyzed. It is shown that the proposed CEEoRS scheme outperforms the TDTwCEE scheme in terms of its SRT. More specifically, the proposed CEEoRS scheme is capable of significantly improving the SRT performance of wireless communications through increasing the number of relays.
Physical layer (PHY) security is recently regarded as a promising technique to improve the security performance of wireless communication networks. Current developments in PHY security are often based on the assumption of perfect channel state information (CSI). In this paper, both security and reliability performance for the downlink cloud radio access network with optimal remote radio heads (RRHs) node selection are investigated in a practical scenario by considering channel estimation (CE) errors. In particular, a three-phase transmission scheme is proposed and the linear minimum mean-square error (MMSE) estimation method is utilized to obtain the CSI. Based on the CSI estimates and the statistics of CE errors, the outage probability and intercept probability are derived in closed-form expression to evaluate the security and reliability performance, respectively. In addition, two possible cases (with or without intercepting signals from baseband unit) are considered for the eavesdropper. It is found that the suggested optimal RRHs selection scheme outperforms the nonselection scheme, and that the increasing number of RRHs can lower the outage probability as well as the intercept probability. It is also shown that there exists an optimal training number to minimize the sum of the outage probability and intercept probability. Finally, simulation results are provided to corroborate our proposed studies.
This paper investigates the physical-layer security (PLS) of wireless transmissions with the aid of multiple decode-and-forward one-way relays in the presence of both eavesdropping attacks and channel estimation errors (CEEs). To protect wireless transmission with CEE, two opportunistic relaying schemes are conceived to upgrade the PLS of the wireless communications with the aid of relays, namely, the CEE-oriented pure relay selection (CEE-PRS) and CEE-oriented jammer-aided relay selection (CEE-JRS), respectively. Moreover, the security-reliability tradeoff (SRT) is designed due to that increasing the transmit power may enhance the reliability, but the security may be sacrificed concurrently, where the security and reliability are characterized by the intercept probability (IP) and outage probability (OP), respectively. We then analyze the IP and OP of the CEE-PRS and CEE-JRS schemes. Furthermore, both the CEE-oriented direct transmission (CEE-DT) and the perfect channel estimation-oriented direct transmission (PCE-DT) schemes are also analyzed for comparison purposes. It is shown that although the SRT of the wireless communications can indeed be degraded by the eavesdropping attacks in low CEE regions, the proposed CEE-PRS and CEE-JRS schemes are capable of significant improving the SRT performance of wireless communications, demonstrating the advantage of the proposed CEE-PRS and CEE-JRS schemes against eavesdropping.
In this paper, we introduce a three-phase transmission scheme for cloud radio networks against eavesdropper. We study the security and reliability performance of this scheme in the form of intercept probability and outage probability, respectively. Channel estimation error is considered in our study instead of assumption of perfect channel state information. It is found that the security-reliability performance improves as the number of relay increases. Moreover, the length of training symbol considerably influences the performance. Simulation results are provided to corroborate our studies.
In this paper, we investigate security-reliability tradeoff on physical layer in Internet of Things (IoT) network, when an eavesdropper tries to intercept secure transmission. The best-node scheduling scheme is employed as an auxiliary tool to decrease probability of intercept. The main and also wiretap channels are assumed to be subjected to composite generalized-K fading. Asymptotic expression of security versus reliability, valid in the range of medium to high average main-to-eavesdropper’s signal ratio (MER) values, is derived. The impact of different system parameters such as IoT network dimension, fading/shadowing conditions, path loss and average MER on intercept probability versus outage probability is observed, and then accompanying numerical results are shown.