Physical Communication最新文献_第2页

Enhancing spectral efficiency in sub-connected hybrid beamforming systems via beam pattern design 通过波束方向设计提高子连接混合波束形成系统的频谱效率

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-05-09 DOI: 10.1016/j.phycom.2025.102700

Neeta Jha, Amrita Mishra, Jyotsna Bapat, Debabrata Das

{"title":"Enhancing spectral efficiency in sub-connected hybrid beamforming systems via beam pattern design","authors":"Neeta Jha, Amrita Mishra, Jyotsna Bapat, Debabrata Das","doi":"10.1016/j.phycom.2025.102700","DOIUrl":"10.1016/j.phycom.2025.102700","url":null,"abstract":"<div><div>Fifth-generation systems with a sub-connected (SC) hybrid beamforming architecture are highly beneficial due to their low complexity and high energy efficiency. The fixed number of antenna elements per subarray renders array gain per data stream limited for SC architecture. Enhancing beamforming gain in this architecture is a challenging problem. This work introduces a novel hybrid precoder designed to enhance spectral efficiency in a multi-user SC hybrid beamforming system by leveraging spatial information about users. An initial beam training approach is employed to gather users’ spatial information, which is further used to form user batches. Each batch is assigned a single coarse steering angle and can have multiple refined steering angles. These angles are used to design the analog and digital beamforming vectors for the proposed hybrid precoder. Users within the same batch employ beam pattern multiplication to efficiently utilize a higher number of antenna elements per data stream, leading to enhanced beamforming gains. The analytical beamforming gain in the presence of user batches has been derived and a relationship between spatial location, user batch formation, and achievable beamforming gain is established. It is observed that the average beamforming gain is maximized when the number of antenna elements per subarray approaches the total number of radio frequency chains. Simulation results demonstrate a significant improvement in beamforming gain and validate the superiority of the proposed design over the conventional SC approach in terms of high beamforming gain and improved spectral efficiency.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"71 ","pages":"Article 102700"},"PeriodicalIF":2.0,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948744","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

Region-specific reliable channel estimation in RIS-enabled wireless communications via clustered federated learning 基于聚类联邦学习的基于ris的无线通信中特定区域可靠信道估计

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-05-08 DOI: 10.1016/j.phycom.2025.102698

Muhammad Asaad Cheema , Apoorva Chawla , Vinay Chakravarthi Gogineni , Pierluigi Salvo Rossi

引用次数: 0

On the performance of hybrid TDMA–NOMA-RIS empowered indoor flying networks under dynamic blockages and imperfect SIC 动态阻塞和不完全SIC条件下TDMA-NOMA-RIS混合动力室内飞行网络性能研究

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-05-07 DOI: 10.1016/j.phycom.2025.102691

Gurinder Singh , Haythem Bany Salameh , Moussa Ayyash , Haitham Al-Obiedollah , Hany Elgala

引用次数: 0

An interleaved iterative-structured joint detection algorithm for active users and frequency offsets in grant-free massive access 无授权海量访问中活跃用户和频率偏移的交错迭代结构联合检测算法

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-05-07 DOI: 10.1016/j.phycom.2025.102697

Shibao Li, Zhihao Cui, Yujie Song, Ziyi Tang, Xuerong Cui, Jianhang Liu

{"title":"An interleaved iterative-structured joint detection algorithm for active users and frequency offsets in grant-free massive access","authors":"Shibao Li, Zhihao Cui, Yujie Song, Ziyi Tang, Xuerong Cui, Jianhang Liu","doi":"10.1016/j.phycom.2025.102697","DOIUrl":"10.1016/j.phycom.2025.102697","url":null,"abstract":"<div><div>Great-free user access is an efficient access method for massive machine-type communications (mMTC). In the massive grant-free access, frequency offsets between users and base stations lead to the degradation of active user detection and channel estimation performance. Although traditional methods achieve joint estimation by extending the perceptual matrix using the grid method, they all ignore the effect of channel fading on joint detection, which can seriously degrade the accuracy of detection. In this paper, we propose an interleaved iterative-structured-vector approximation message passing (VAMP) algorithm, which makes use of the structuring of the extended perceptual matrix, and designs a minimum mean square error (MMSE) nonlinear vector noise reducer based on the Bayesian principle to eliminate the effect of channel fading on detection. In addition, in order to improve the detection accuracy, a two-layer alternating iterative search method is proposed, which effectively overcomes the performance loss caused by the frequency offset of the grid method estimation. Simulation results show that the proposed scheme is superior in active user detection and frequency offset detection accuracy compared with the traditional schemes.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"71 ","pages":"Article 102697"},"PeriodicalIF":2.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143924596","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

Spectrum market stability and variation of rationality in a cognitive radio network 认知无线电网络中频谱市场稳定性与理性变化

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-05-02 DOI: 10.1016/j.phycom.2025.102699

Lhoussaine Daoudi , Hamid Garmani , Mohamed Baslam , Said Safi

{"title":"Spectrum market stability and variation of rationality in a cognitive radio network","authors":"Lhoussaine Daoudi , Hamid Garmani , Mohamed Baslam , Said Safi","doi":"10.1016/j.phycom.2025.102699","DOIUrl":"10.1016/j.phycom.2025.102699","url":null,"abstract":"<div><div>The transition to 5G and 6G presents spectrum dissipation challenges, requiring efficient utilization. Cognitive Radio Networks (CRNs) enable Primary Users (PUs) to lease unused spectrum to Secondary Users (SUs), which generates revenue while improving spectrum utilization efficiency. Consequently, PUs must manage their resources effectively while setting reasonable spectrum lease prices. To address this issue, this paper introduces a Cournot-type non-cooperative price game to model the selfish behavior of PUs under limited information driven by the dynamics of network. By employing a bounded rationality learning mechanism and a best-response algorithm, Nash Equilibrium (NE) is attained, allowing PUs to maximize profits autonomously and equitably while offering spectrum at competitive price rates—an increasingly vital goal as 5G/6G networks drive up spectrum demand and costs. In contrast to prior works that assumed fully rational behavior from all users at all times, a key contribution of this study is the examination of how variations in SU rationality over time affect system stability, reflecting the dynamic behavior of dense CRNs. Numerical simulations demonstrate that high learning rates, stringent QoS demands lead to chaotic and unstable dynamics, whereas lower irrationality contributes to price reduction. To mitigate instability, a time-delayed feedback control is applied to eliminate chaos and restore stability, offering key insights into user behavior and system efficiency for managing next-generation CRNs.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"71 ","pages":"Article 102699"},"PeriodicalIF":2.0,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143906787","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 UAV deployment and resource optimization for enhanced data rates in CDRT-NOMA CDRT-NOMA中提高数据速率的高效无人机部署和资源优化

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-05-01 DOI: 10.1016/j.phycom.2025.102696

Kota Nageswara Rao , Kalpana Naidu

引用次数: 0

RIS based covert symbiotic radio exploiting a full-duplex receiver 基于RIS的隐蔽共生无线电利用全双工接收机

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-04-30 DOI: 10.1016/j.phycom.2025.102695

Shaoqin Shi, Ke-Wen Huang

引用次数: 0

Channel estimation in hybrid RIS-assisted MIMO OFDM systems independent of a Backhaul link 独立于回程链路的ris辅助MIMO OFDM混合系统的信道估计

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-04-25 DOI: 10.1016/j.phycom.2025.102687

Xiayang Chen , Taiyang Ling , Jiachen Tian , Yu Han , Shi Jin

{"title":"Channel estimation in hybrid RIS-assisted MIMO OFDM systems independent of a Backhaul link","authors":"Xiayang Chen , Taiyang Ling , Jiachen Tian , Yu Han , Shi Jin","doi":"10.1016/j.phycom.2025.102687","DOIUrl":"10.1016/j.phycom.2025.102687","url":null,"abstract":"<div><div>A hybrid reconfigurable intelligent surface (HRIS) with active elements is expected to improve channel estimation procedure in RIS-assisted wireless communication systems effectively. However, most related works depend on a wired or wireless backhaul link between the base station (BS) and the HRIS, restricting the flexibility of HRIS deployment. In this paper, a backhaul-independent HRIS (BI-HRIS) is proposed to address this issue, albeit at the cost of introducing new requirements for parameter interaction between the BS and the HRIS. Specifically, we face a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system with the assistance of a BI-HRIS, where a multiple-path channel model with a practical path loss model is considered. Subsequently, we propose a beamforming-based parameter interaction strategy, in which estimated channel parameters are transmitted from the HRIS or the BS to the other side by altering the beamforming directions. On this foundation, a complete channel estimation scheme is established, including the pilot protocol, HRIS reflection phase shift control, and BS beamforming control. Based on the parameter interaction strategy, the scheme enables the BS and the HRIS successively reconstruct the RIS-BS channel and UE-RIS channel. Numerical simulations demonstrate that the proposed schemes enable accurate channel parameters extraction and realize superior performance of channel reconstruction.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"71 ","pages":"Article 102687"},"PeriodicalIF":2.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912138","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

Probabilistic shaping of joint source-channel coding and modulation system based on SC-LDPC codes 基于SC-LDPC码的联合信源信道编码与调制系统的概率整形

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-04-25 DOI: 10.1016/j.phycom.2025.102693

Jichen He , Qiufang Lian , Sanya Liu , Shan Lu , Lin Zhou

{"title":"Probabilistic shaping of joint source-channel coding and modulation system based on SC-LDPC codes","authors":"Jichen He , Qiufang Lian , Sanya Liu , Shan Lu , Lin Zhou","doi":"10.1016/j.phycom.2025.102693","DOIUrl":"10.1016/j.phycom.2025.102693","url":null,"abstract":"<div><div>The integration of the joint source-channel coding (JSCC) system with bit-interleaved coded modulation (BICM) and the deployment of high-order modulation can facilitate a further enhancement in the system’s bandwidth efficiency and throughput. Indeed, spatially coupled low-density parity-check (SC-LDPC) codes exhibit reduced decoding latency and complexity when compared to conventional LDPC codes. Consequently, this paper proposes a joint source-channel coding and modulation (JSCCM) scheme, based on SC-LDPC codes (SC-LDPC-JSCCM). Despite the recent surge in research on probabilistic amplitude shaping (PAS) within the BICM framework, the majority of these studies have exclusively focused on source distributions characterized by uniformity and equal probability. The combination of probabilistic shaping (PS) and JSCC technology allows the unequal probability of the source to be exploited to make full use of the symbol redundancy generated, thereby further improving the reliability of the high-order modulation system. In this paper, by integrating a novel bit marking probabilistic shaping technology, an adaptive optimal probabilistic shaping (AOPS) algorithm is designed to further enhance the performance of the SC-LDPC-JSCCM system. The simulation experiments reveal that the AOPS scheme not only brings the system capacity closer to the Shannon limit, but also significantly improves the system’s bit error rate performance. These results underscore the substantial enhancement provided by the AOPS algorithm in the SC-LDPC-JSCCM system, confirming its potential and novelty.</div></div>","PeriodicalId":48707,"journal":{"name":"Physical Communication","volume":"71 ","pages":"Article 102693"},"PeriodicalIF":2.0,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143883130","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

Ergodic capacity estimation in the uplink of large intelligent surfaces with linear receivers 基于线性接收机的大型智能曲面上行链路遍历容量估计

IF 2 4区计算机科学

Physical Communication Pub Date : 2025-04-24 DOI: 10.1016/j.phycom.2025.102694

Sepideh Ghandali, Hamid Meghdadi, Ali Shahzadi

引用次数: 0