Physical Communication最新文献_第10页

Performance analysis of IRS-UAV-assisted active jamming receiver against active eavesdropper 红外-无人机辅助有源干扰接收机抗有源窃听器性能分析

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-12-29 DOI: 10.1016/j.phycom.2025.102978

Yi Shen , Yuxin Xin , Ping Tan

{"title":"Performance analysis of IRS-UAV-assisted active jamming receiver against active eavesdropper","authors":"Yi Shen , Yuxin Xin , Ping Tan","doi":"10.1016/j.phycom.2025.102978","DOIUrl":"10.1016/j.phycom.2025.102978","url":null,"abstract":"<div><div>We propose a secure transmission system in the presence of an illegal user on the ground. Due to the shielding of obstacles, the ground source is unable to directly transmit confidential information to the ground destination. Therefore, the ground source relays the confidential information to the ground destination through a jointly deployed relay system comprising intelligent reflecting surface and unmanned aerial vehicle (IRS-UAV). The illegal user either monitors the legitimate communication link or actively eavesdrops on legitimate information. Consequently, we consider that the destination employs an active jamming strategy to disrupt the eavesdropper’s reception, thereby enhancing the security and covert performance of the legitimate communication. Based on this scenario, we derive approximate expressions for the detection error probability, covert rate, transmission outage probability, and secrecy outage probability, and analyze the corresponding secure and covert performance. Simulations verify the correctness of the derived formulas and determine the optimal parameters for the destination and illegal user. Analysis demonstrates that introducing active interference by the legitimate destination can prevent the warden from detecting the covert communication with absolute certainty. Furthermore, the deployment of an active IRS is shown to significantly enhance the overall security performance of the system. Conversely, active interference by the eavesdropper increases the secrecy outage probability, thereby degrading secure transmission performance.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"74 ","pages":"Article 102978"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid LSTM-actor-critic framework for temporal-spatial wideband beam tracking in 6G THz massive MIMO 6G THz大规模MIMO中时空宽带波束跟踪的混合LSTM-actor-critic框架

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-11-30 DOI: 10.1016/j.phycom.2025.102933

Siva Kumar T, Jeyakumar P

{"title":"Hybrid LSTM-actor-critic framework for temporal-spatial wideband beam tracking in 6G THz massive MIMO","authors":"Siva Kumar T, Jeyakumar P","doi":"10.1016/j.phycom.2025.102933","DOIUrl":"10.1016/j.phycom.2025.102933","url":null,"abstract":"<div><div>Efficient beam tracking is essential for stable high-throughput communication in ultra-wideband terahertz (THz) massive MIMO systems. However, existing reinforcement learning (RL)-based methods often overlook temporal channel variations and beam squint effects inherent to wideband THz links. To address this, we propose a Hybrid Long Short-Term Memory–Actor-Critic (LSTM–A2C) framework that integrates temporal prediction and spatial decision-making for adaptive beam tracking in 6G THz systems. The LSTM captures beam dynamics over time, while the Actor–Critic learner adjusts beamforming vectors in real time under mobility and hardware impairments. Simulations under realistic THz conditions (with phase noise, ADC quantization, and beam squint) show that LSTM–A2C achieves 15–25 % higher tracking accuracy and 30–40 % lower error compared to DQN, PPO, and EKF methods. It also delivers 3.5 bps/Hz spectral efficiency at 10 dB SNR, 2.1 bits/Joule energy efficiency, and a fairness index of 0.99 in multi-user settings. The reward curve shows faster convergence ( ≈  200 epochs), validating the proposed framework’s efficiency.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"74 ","pages":"Article 102933"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145748481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Joint beamforming and phase optimization for UAV-RIS systems by gradient-based adaptive meta-learning 基于梯度自适应元学习的无人机- ris系统联合波束形成与相位优化

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-11-28 DOI: 10.1016/j.phycom.2025.102942

Shibao Li , Qishuai Guan , Yunwu Zhang , Xuerong Cui , Huajun Song , Zhaozhi Gu , Lianghai Li

{"title":"Joint beamforming and phase optimization for UAV-RIS systems by gradient-based adaptive meta-learning","authors":"Shibao Li , Qishuai Guan , Yunwu Zhang , Xuerong Cui , Huajun Song , Zhaozhi Gu , Lianghai Li","doi":"10.1016/j.phycom.2025.102942","DOIUrl":"10.1016/j.phycom.2025.102942","url":null,"abstract":"<div><div>With the rapid advancement of wireless communication technologies, achieving high reliability, low latency, and energy efficiency remains a critical challenge. Unmanned Aerial Vehicle-mounted Reconfigurable Intelligent Surfaces (UAV-RIS) leverage both the reconfigurability of RIS and the mobility of UAVs to enhance air-to-ground link quality. This paper investigates the joint optimization of UAV trajectory, base station (BS) beamforming, and RIS phase control in UAV-RIS-assisted systems. A density-aware positioning algorithm is first introduced to optimize the UAV trajectory and improve link robustness. Building upon this, a gradient-based adaptive meta-learning (GAML) framework is developed to jointly optimize BS beamforming and RIS phase shifts without extensive pre-training, thereby enhancing adaptability in time-varying channels. The proposed GAML scheme avoids explicit non-convex optimization and significantly reduces computational complexity. Furthermore, the integration of adaptive network structures enhances gradient propagation and mitigates vanishing gradients. Simulation results show that GAML outperforms existing learning-based and random phase methods, achieving up to 14.25% improvement in weighted sum rate (WSR), demonstrating its superior adaptability and efficiency.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"74 ","pages":"Article 102942"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient signal detection in downlink NOMA systems using LSTM-projected layer deep neural networks 基于lstm投影层深度神经网络的下行NOMA系统有效信号检测

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-12-07 DOI: 10.1016/j.phycom.2025.102950

Sebin J. Olickal, Renu Jose

{"title":"Efficient signal detection in downlink NOMA systems using LSTM-projected layer deep neural networks","authors":"Sebin J. Olickal, Renu Jose","doi":"10.1016/j.phycom.2025.102950","DOIUrl":"10.1016/j.phycom.2025.102950","url":null,"abstract":"<div><div>Non-orthogonal multiple access (NOMA) systems help to increase the spectral efficiency of wireless communication and thus support many users simultaneously, making them suitable for next-generation wireless networks. However, signal detection in NOMA systems remains a significant challenge due to inherent interference between users. This paper introduces a novel deep learning (DL) based signal detection method which uses a long-short-term memory projected layer (LSTM-PL), a deep neural network (DNN) model to address this challenge effectively. The proposed approach uses the sequence learning capabilities of LSTMs to capture temporal dependencies in received signals, enabling more accurate detection of superimposed user signals. By incorporating a Projected Layer (PL), the complexity of the detection process is substantially reduced, making it suitable for real-time applications. Extensive simulations demonstrate that the proposed LSTM-PL-based detector achieves a better symbol error rate (SER) compared to traditional signal detection techniques and other DNNs. The method is compared with conventional approaches such as least squares (LS) successive interference cancellation (SIC) and SIC minimum mean square error (MMSE), as well as deep learning methods such as LSTM and gated recurrent unit (GRU). The simulations were conducted using different pilot lengths: 64, 16, 8, and 4. The SER shows that the proposed method leaves behind both conventional and other DNN techniques, offering a robust and efficient solution for signal detection in NOMA systems.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"74 ","pages":"Article 102950"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145747983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phase noise mitigation in higher order probabilistic constellation shaping for high-capacity optical communications 大容量光通信中高阶概率星座成形中的相位噪声抑制

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-11-30 DOI: 10.1016/j.phycom.2025.102946

Sunil Narayan Thool, Devendra Chack

{"title":"Phase noise mitigation in higher order probabilistic constellation shaping for high-capacity optical communications","authors":"Sunil Narayan Thool, Devendra Chack","doi":"10.1016/j.phycom.2025.102946","DOIUrl":"10.1016/j.phycom.2025.102946","url":null,"abstract":"<div><div>The advancement of Probabilistic Constellation Shaping (PCS) is pivotal for high-capacity optical communication systems and the forthcoming 6 G era. PCS aims to approach the Shannon limit, optimising signal efficiency and performance. However, phase noise from continuous-wave (CW) lasers significantly impacts system performance, especially in terms of bit error rate (BER). This paper introduces and evaluates phase noise estimation and correction using the Viterbi & Viterbi (V&V) algorithm at a 50 Gbaud symbol rate in dual-polarised high-capacity optical systems employing higher-order Quadrature Amplitude Modulation (QAM) schemes, such as 64-QAM and 256-QAM PCS. A comparative analysis with the Blind Phase Search (BPS) algorithm demonstrates the V&V algorithm’s ability to maintain BER of 10<sup>–5</sup> and 10<sup>–4</sup> for 64-QAM and 256-QAM PCS, respectively, under CW laser linewidth of 1 MHz. Extensive numerical results demonstrate that the V&V algorithm consistently meets the other analytical parameter requirements of the optical link under CW laser linewidths ranging from 10 kHz to 1 MHz. The implemented system design emphasises the V&V algorithm’s robustness in handling phase noise, highlighting its potential to enhance reliability and performance in high-capacity optical communication systems. The findings underscore the potential of our approach to meet the forthcoming requirements of optical links.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"74 ","pages":"Article 102946"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145694726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved subspace-based method for estimating frequency of unknown signals 基于子空间的未知信号频率估计改进方法

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-11-24 DOI: 10.1016/j.phycom.2025.102930

Bin Peng , Changxiang Fan

引用次数: 0

CFO-based physical-layer authentication for integrated sensing and communication under dynamic time resources 动态时间资源下基于cfo的集成传感与通信物理层认证

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-12-31 DOI: 10.1016/j.phycom.2025.102977

Tuanwei Tian , Ke Shao , Jing Yang , Jinlong Zhang , Hao Deng

{"title":"CFO-based physical-layer authentication for integrated sensing and communication under dynamic time resources","authors":"Tuanwei Tian , Ke Shao , Jing Yang , Jinlong Zhang , Hao Deng","doi":"10.1016/j.phycom.2025.102977","DOIUrl":"10.1016/j.phycom.2025.102977","url":null,"abstract":"<div><div>This study proposes an integrated sensing and communication (ISAC) framework that incorporates physical-layer authentication through a time-slotted protocol with delayed authentication. To begin with, we propose a time-slotted framework in which the carrier frequency offset (CFO) features obtained during the previous authentication phase are used as a reference for current real-time transmitter verification. This structure effectively decouples the sensing and security operations while ensuring both high-precision target localization and robust authentication. Then, we establish a unified analytical model that quantitatively connects the Cramér-Rao Bound (CRB) for time-of-arrival and direction-of-arrival estimation with CFO-based authentication performance, explicitly characterizing the trade-off between sensing accuracy and authentication security under joint time-power resource constraints. Finally, extensive simulations validate the analytical framework and demonstrate significant performance improvements over conventional schemes in terms of authentication probability, detection accuracy, and localization error across various signal-to-noise ratios and mobility conditions. The robustness of the proposed scheme under practical hardware imperfections is also verified.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"74 ","pages":"Article 102977"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145938670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Roadside beyond diagonal reconfigurable intelligent surfaces scattering matrix design for vehicular application 路边超对角线可重构智能表面散射矩阵设计在车辆中的应用

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-12-13 DOI: 10.1016/j.phycom.2025.102963

Fatemeh Mozhdehjou , Mahmoud Atashbar , Hamed Alizadeh Ghazijahani

引用次数: 0

Doppler-aware dynamic resource allocation for V2X communications using Double Deep Q-Network 基于双深q网络的V2X通信多普勒感知动态资源分配

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-11-26 DOI: 10.1016/j.phycom.2025.102923

Xi Huang , Yingying Yu , Longfei Huang , Wenxun Chen

{"title":"Doppler-aware dynamic resource allocation for V2X communications using Double Deep Q-Network","authors":"Xi Huang , Yingying Yu , Longfei Huang , Wenxun Chen","doi":"10.1016/j.phycom.2025.102923","DOIUrl":"10.1016/j.phycom.2025.102923","url":null,"abstract":"<div><div>To address the real-time and robustness challenges of resource allocation under rapidly time-varying channels in high-mobility scenarios, this paper proposes an MHA-augmented scheme within a centralized-training–decentralized-execution architecture for mixed V2I/V2V services. First, we adopt a bounded V2V normalized completion rate as a physically meaningful reliability metric. Second, we embed a Multi-Head Attention layer at the front end of the DDQN Q-network: local observations from each link are linearly projected into Query, Key and Value vectors, and multiple attention heads compute in parallel to produce a set of weighted contextual features. This enables agents to dynamically focus on the interference links most severely affected by Doppler shifts. In addition, we incorporate Prioritized Experience Replay together with importance-sampling correction and priority clipping to control sampling bias and to accelerate learning from critical, Doppler- or blockage-induced extreme samples. Simulation results indicate that the proposed hybrid MHA-enhanced scheme increases average V2I throughput by about 9.7%, while still retaining an approximately 5% advantage in high-density, high-speed scenarios. Concurrently, end-to-end V2V transmission success probability improves by roughly 7.8% on average and attains an average gain of about 9.2% at the peak speed of 30 m/s. These experiments validate the complementary effects of MHA and PER under strong Doppler perturbations and demonstrate the effectiveness of the proposed method in multicriteria trade-offs and engineering-level deployment. <span><span>https://github.com/HX-hx206/V2XX.git</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"74 ","pages":"Article 102923"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145625378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance analysis of covert communication in the presence of intelligent eavesdroppers 智能窃听存在下的隐蔽通信性能分析

IF 2.2 4区计算机科学

Physical Communication Pub Date : 2026-02-01 Epub Date: 2025-11-24 DOI: 10.1016/j.phycom.2025.102927

Yinuo Zhao , Enyu Li , Xiaofei Zhai , Weidong Yao , Tonghao Wang

{"title":"Performance analysis of covert communication in the presence of intelligent eavesdroppers","authors":"Yinuo Zhao , Enyu Li , Xiaofei Zhai , Weidong Yao , Tonghao Wang","doi":"10.1016/j.phycom.2025.102927","DOIUrl":"10.1016/j.phycom.2025.102927","url":null,"abstract":"<div><div>The objective of information confrontation is to detect, interfere with and disrupt satellite communications while protecting one’s own communication. In view of the above background, a covert communication system model is proposed in the information confrontation environment. The exact closed-form result of the detection error probability (DEP) of the eavesdropping user is analyzed, and the optimal value of DEP and the optimal decision threshold are also given. Considering the behavior that intelligent eavesdroppers automatically select attacks and eavesdropping, combined with non-orthogonal multiple access (NOMA) technology and the imperfect successive interference cancellation (SIC) technology, the exact closed-form results of the outage probability of legitimate users and the intercept probability of eavesdroppers are derived, and the approximate results are also given in high signal-to-noise ratio (SNR). Finally, the accuracy of the theoretical derivation is verified by Monte Carlo simulation, and the influence of relevant system parameters is discussed concretely in the simulation. The numerical simulation results show that a reasonable selection of system parameters can improve the covert performance and anti-interference ability of the system, thereby achieving more reliable covert communication.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"74 ","pages":"Article 102927"},"PeriodicalIF":2.2,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145625379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0