Secure Resource Allocation for Cooperative OFDMA System With Untrusted AF Relaying

Yi-feng, Jin; Li, Xunan; Lv, Guocheng; Zhao, Meihui

doi:10.1109/access.2021.3130067

Cited by 5 publications

(2 citation statements)

References 38 publications

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“…(33) Therefore, the a posteriori expectation of the matrix X shown in (19) can be constructed by replacing each element in the matrix with its corresponding a posteriori expectation computed in (32). Accordingly, one can easily construct the matrices of A 1 and B 1 as A 1 = X, X, X * , X * and B 1 = X, X, X, X, X * , X * , X * , X * , where X is the a posteriori expectation of the matrix X.…”

Section: Ymentioning

confidence: 99%

Coded Assisted Transmit and Receive IQ Mismatch Compensation With Channel Estimation for AF Cooperative OFDM Systems

Marey

Mostafa

2023

IEEE Access

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Amplify-and-forward (AF) orthogonal frequency division multiplexing (OFDM) transmissions encounter a significant difficulty in the form of in-phase and quadrature phase (IQ) mismatch. Previous reports on this problem have solely been discussed in the context of uncoded transmissions. In addition, in these precedent studies, IQ equalization must be conducted following the estimation stage for accurate detection of data symbols. This research delves into the issue of the IQ mismatch between transmission and reception in AF-OFDM systems in the context of channel coding. We design a magnificent code-aided approach to predict the overall channel impulse responses (CIRs), which encompass the actual CIRs and IQ mismatch originating at the source, relay, and destination. Instead of using a collection of algorithms, the proposed approach can be utilized to estimate nine parameters simultaneously. Due to the impractical nature of the precise maximum-likelihood (ML) strategy to this situation, we instead utilize an expectation-maximization (EM) process as a low complexity strategy to predict the parameters under consideration. The suggested estimation approach uses an iterative process to improve predictions exploiting the a priori knowledge gained from the soft information supplied by the channel decoder. In addition, we demonstrate how to carry out data detection by making use of the estimated parameters. The simulation results verify the effectiveness of the proposed estimator and detector for usage in real-world settings, with superiority over the conventional ones.

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Section: Ymentioning

confidence: 99%

Coded Assisted Transmit and Receive IQ Mismatch Compensation With Channel Estimation for AF Cooperative OFDM Systems

Marey

Mostafa

2023

IEEE Access

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“…In two-way relay assisted orthogonal frequency division multiplexing (OFDM) systems, channel gains of one subcarrier in one hop differ from another hop, and system capacity can be maximized by subcarrier pairing and power allocation [ 22 ]. The joint resource allocation in the secure OFDM one-way system was studied in some previous works [ 23 , 24 , 25 ]; however, due to the differences in system models, the existing resource allocation schemes cannot be applied in an OFDM two-way untrusted relay system. A summary of related work is presented in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

Joint Resource Allocation in Secure OFDM Two-Way Untrusted Relay System

Yi-feng

et al. 2022

Sensors

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The security issue of wireless communication is a common concern because of its broadcast nature, especially when the relay becomes an eavesdropper. In the orthogonal frequency division multiplexing (OFDM) relay system, when the relay is untrusted, the security of the system faces serious threats. Although there exist some resource allocation schemes in a single-carrier system with untrusted relaying, it is difficult to apply them to the multi-carrier system. Hence, a resource allocation scheme for the multi-carrier system is needed. Compared to the one-way relay system, a two-way relay system can improve the data transmission efficiency. In this paper, we consider joint secure resource allocation for a two-way cooperative OFDM system with an untrusted relay. The joint resource allocation problem of power allocation and subcarrier pairing is formulated to maximize the sum secrecy rate of the system under individual power constraints. To solve the non-convex problem efficiently, we propose an algorithm based on the alternative optimization method. The proposed algorithm is evaluated by simulation results and compared with the benchmarks in the literature. According to the numerical results, in a high signal-to-noise ratio (SNR) scenario, the proposed algorithm improves the achievable sum secrecy rate of the system by more than 15% over conventional algorithms.

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Second-Order Statistics for STBC Classification Over Amplify-and-Forward Cooperative Systems

Marey

Mostafa

2023

IEEE Access

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Secure Resource Allocation for Cooperative OFDMA System With Untrusted AF Relaying

Cited by 5 publications

References 38 publications

Coded Assisted Transmit and Receive IQ Mismatch Compensation With Channel Estimation for AF Cooperative OFDM Systems

Coded Assisted Transmit and Receive IQ Mismatch Compensation With Channel Estimation for AF Cooperative OFDM Systems

Joint Resource Allocation in Secure OFDM Two-Way Untrusted Relay System

Second-Order Statistics for STBC Classification Over Amplify-and-Forward Cooperative Systems

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