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Random Access in Fast Fading Channels: Signature Code Design and Active User Identification 快速衰减信道中的随机接入：签名代码设计和主动用户识别
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-11 DOI: 10.1109/LCOMM.2024.3457909
Pinmo Li;Jianping Zheng
{"title":"Random Access in Fast Fading Channels: Signature Code Design and Active User Identification","authors":"Pinmo Li;Jianping Zheng","doi":"10.1109/LCOMM.2024.3457909","DOIUrl":"10.1109/LCOMM.2024.3457909","url":null,"abstract":"In this letter, we study the signature code design and active user identification for the random access in fast fading channels. First, we propose a constant-weight signature code construction by utilizing the on-off pattern of the binary subspace chirps. The constructed code has low fading coherence and large size, and thus guarantees good performance with large number of access users. Second, a practical activity detection based on the generalized approximate message passing is proposed. Finally, the performance of the proposed signature code and activity detection is demonstrated by computer simulations.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 11","pages":"2473-2477"},"PeriodicalIF":3.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Secure Communication for RSMA Systems: Integrating Spatial and WFRFT Signal Domains RSMA 系统的安全通信：整合空间和 WFRFT 信号域
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-10 DOI: 10.1109/LCOMM.2024.3457617
Heng Dong;Xiaojie Fang;Jun Zhao;Xu Lin;Xuejun Sha;Zhuoming Li
{"title":"Secure Communication for RSMA Systems: Integrating Spatial and WFRFT Signal Domains","authors":"Heng Dong;Xiaojie Fang;Jun Zhao;Xu Lin;Xuejun Sha;Zhuoming Li","doi":"10.1109/LCOMM.2024.3457617","DOIUrl":"10.1109/LCOMM.2024.3457617","url":null,"abstract":"In this letter, we investigate secure communication for the downlink rate-splitting multiple access (RSMA) system by integrating both the spatial domain and weighted fractional Fourier transform (WFRFT) signal domain to enhance its physical layer security (PLS) performance. To counter the external passive eavesdropper, we propose an RSMA-CM-WFRFT scheme to promote the dual use of the common message (CM), thereby improving the secrecy rate of both common and private messages. Specifically, the common message is encoded based on WFRFT, enabling all received power of legitimate users for signal reconstruction, while introducing inter-component interference at the eavesdropper. Furthermore, the inevitable serial interference caused by the WFRFT-encoded CM sequence overlays onto the private message (PM), thus enhancing its security. To counter internal eavesdroppers, we propose an RSMA-PM-WFRFT scheme to achieve parallel encryption by encoding the private message of different users into different WFRFT domains. Additionally, we formulate and solve a non-convex optimization problem aimed at minimizing the required power under both security and reliability constraints. Numerical results demonstrate the superior performance of the two proposed schemes.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 11","pages":"2498-2502"},"PeriodicalIF":3.7,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Serial Multicode Direct Sequence Spread Spectrum With Applications to Satellite Navigation Pilot Channels 串行多码直接序列扩频与卫星导航先导信道应用
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-10 DOI: 10.1109/LCOMM.2024.3457693
Roberto Garello
{"title":"Serial Multicode Direct Sequence Spread Spectrum With Applications to Satellite Navigation Pilot Channels","authors":"Roberto Garello","doi":"10.1109/LCOMM.2024.3457693","DOIUrl":"10.1109/LCOMM.2024.3457693","url":null,"abstract":"In this letter we introduce Serial Bicode and Serial Multicode Direct Sequence Spread Spectrum (DSSS) and we extend them to Code Division Multiple Access (CDMA). To each user are assigned two or more spreading codes. The information is associated to these codes, which are alternated within a single DSSS signal. The performance of the new techniques for incoherent demodulation is analyzed. Additionally, we present the application to the construction of data-less pilot channels for satellite navigation systems. Alternative codes can be used to embed a pattern or a message that, when recognized, allows to quickly solve time ambiguity and simplify initial synchronization for MEO and LEO scenarios.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 11","pages":"2603-2607"},"PeriodicalIF":3.7,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190006","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
On the Joint Optimization of Signal Constellations and Bit Mappings 论信号星座和比特映射的联合优化
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-10 DOI: 10.1109/LCOMM.2024.3456823
Sandushan Ranaweera;Beeshanga Abewardana Jayawickrama;Ying He;Quynh Tu Ngo;Ren Ping Liu
{"title":"On the Joint Optimization of Signal Constellations and Bit Mappings","authors":"Sandushan Ranaweera;Beeshanga Abewardana Jayawickrama;Ying He;Quynh Tu Ngo;Ren Ping Liu","doi":"10.1109/LCOMM.2024.3456823","DOIUrl":"10.1109/LCOMM.2024.3456823","url":null,"abstract":"This letter presents an enhanced gradient search algorithm for jointly optimizing signal constellations and bit mappings. This approach stands in contrast to the recent trend of utilizing deep learning (DL) to model communication systems as end-to-end (E2E) systems, which often involve a large number of learnable parameters and high computational complexity during training. We enhance the efficiency of the gradient search algorithm by leveraging the symmetrical properties of the I/Q plane, particularly in higher modulation orders. The resulting constellations are evaluated in terms of bit error rate (BER) performance under additive white Gaussian noise and Rayleigh flat fading channels. Our findings indicate that the optimized constellations obtained via the enhanced gradient search algorithm outperform an attention-empowered DL-based E2E system in terms of BER across both channels, notably in higher signal-to-noise ratio regimes, without encountering error floor issues.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 11","pages":"2513-2517"},"PeriodicalIF":3.7,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Power Allocation and Hybrid Beamforming of mmWave NOMA Systems Using DDPG 使用 DDPG 实现毫米波 NOMA 系统的联合功率分配和混合波束成形
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-10 DOI: 10.1109/LCOMM.2024.3457166
Alireza Soofinezhadmoghaddam;Hamidreza Bakhshi
{"title":"Joint Power Allocation and Hybrid Beamforming of mmWave NOMA Systems Using DDPG","authors":"Alireza Soofinezhadmoghaddam;Hamidreza Bakhshi","doi":"10.1109/LCOMM.2024.3457166","DOIUrl":"10.1109/LCOMM.2024.3457166","url":null,"abstract":"Joint Hybrid Beamforming (HBF) and Power Allocation (PA) in mmWave nonorthogonal multiple access (NOMA) systems are investigated in this letter. We consider downlink mmWave NOMA systems, in which HBF is done at the Base Station (BS), and all users have only one antenna. At the BS, user grouping uses the K-means-based algorithm according to the user’s channel correlation. Subsequently, inspired by the benefits of Deep Reinforcement Learning (DRL), a novel algorithm based on DRL is proposed to output the HBF matrix and PA of all the users. Simulations represent the superiority of the proposed algorithm in comparison with the state-of-the-art schemes in both perfect Channel State Information (CSI) and imperfect CSI.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 11","pages":"2578-2582"},"PeriodicalIF":3.7,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Evaluation of MRC Systems Over Sub-Terahertz MFTR Fading Channels 亚太赫兹 MFTR 消隐信道上的 MRC 系统性能评估
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-06 DOI: 10.1109/LCOMM.2024.3455798
Nathaly Orozco Garzón;Henry Carvajal Mora;Fernando Almeida García;José Vega-Sánchez;Diana Moya Osorio
{"title":"Performance Evaluation of MRC Systems Over Sub-Terahertz MFTR Fading Channels","authors":"Nathaly Orozco Garzón;Henry Carvajal Mora;Fernando Almeida García;José Vega-Sánchez;Diana Moya Osorio","doi":"10.1109/LCOMM.2024.3455798","DOIUrl":"10.1109/LCOMM.2024.3455798","url":null,"abstract":"We analyze the outage probability (OP), ergodic capacity (EC), and average bit error probability (ABEP) of L-branch diversity systems using maximal-ratio-combining (MRC) over Multi-cluster-Fluctuating-Two-Ray (MFTR) fading channels, a model well-suited for sub-terahertz bands. We derive exact OP, EC, and ABEP expressions. For this latter metric, we assume M-ary quadrature amplitude modulation (M-QAM), and we also perform its asymptotic analysis to obtain the coding gain and diversity order. Unlike previous works for simpler fading models, our expressions retain consistent complexity regardless of the number of MRC branches and depend on functions available in standard mathematical software. The results show that coding gain relies on fading distribution parameters, L, and M. Meanwhile, diversity order is determined by multiplying L with the number of multipath clusters in the MFTR model.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 10","pages":"2422-2426"},"PeriodicalIF":3.7,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10669087","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental Study on ISAC Performance With Different Sensing Sequences 不同传感序列下 ISAC 性能的实验研究
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-06 DOI: 10.1109/LCOMM.2024.3455779
Diao Wang;Weiwei Chen;Yinghui He;Jianfeng Wang;Haiyan Luo;Guanding Yu
{"title":"Experimental Study on ISAC Performance With Different Sensing Sequences","authors":"Diao Wang;Weiwei Chen;Yinghui He;Jianfeng Wang;Haiyan Luo;Guanding Yu","doi":"10.1109/LCOMM.2024.3455779","DOIUrl":"10.1109/LCOMM.2024.3455779","url":null,"abstract":"Integrated sensing and communication (ISAC) has been recognized as one of the key techniques for 6G, aiming at realizing smart sensing applications using wireless signals. However, existing investigations are limited to the algorithm design for smart sensing applications, and the parameters affecting sensing performance have not been thoroughly explored. To fill this gap, we study the impact of sensing sequences and communication parameters on the performance with real-world evaluations in this letter. Specifically, we develop a sensing platform based on USRP X310 and propose a novel packet detection algorithm as well as a time synchronization algorithm. Two typical applications, i.e., human pose recognition and dynamic gesture recognition, have been conducted under different sequences and communication parameters. The extensive results indicate that the sensing performance is identical across various sequences, and the relationship between the sensing performance and communication parameters is fully investigated.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 11","pages":"2538-2542"},"PeriodicalIF":3.7,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Communication-Efficient Model Aggregation With Layer Divergence Feedback in Federated Learning 联盟学习中利用层发散反馈进行通信效率高的模型聚合
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-05 DOI: 10.1109/LCOMM.2024.3454632
Liwei Wang;Jun Li;Wen Chen;Qingqing Wu;Ming Ding
{"title":"Communication-Efficient Model Aggregation With Layer Divergence Feedback in Federated Learning","authors":"Liwei Wang;Jun Li;Wen Chen;Qingqing Wu;Ming Ding","doi":"10.1109/LCOMM.2024.3454632","DOIUrl":"10.1109/LCOMM.2024.3454632","url":null,"abstract":"Federated Learning (FL) facilitates collaborative machine learning by training models on local datasets, and subsequently aggregating these local models at a central server. However, the frequent exchange of model parameters between clients and the central server can result in significant communication overhead during the FL training process. To solve this problem, this letter proposes a novel FL framework, the Model Aggregation with Layer Divergence Feedback mechanism (FedLDF). Specifically, we calculate model divergence between the local model and the global model from the previous round. Then through model layer divergence feedback, the distinct layers of each client are uploaded and the amount of data transferred is reduced effectively. Moreover, the theoretical analysis reveals that the access ratio of clients has a positive correlation with model performance. Simulation results show that our algorithm uploads local models with reduced communication overhead while upholding a superior global model performance.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 10","pages":"2293-2297"},"PeriodicalIF":3.7,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Quantum Codes for Asymmetric Channels: ZZZY Surface Codes 非对称信道的量子编码：ZZZY 表面码
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-05 DOI: 10.1109/LCOMM.2024.3454804
Diego Forlivesi;Lorenzo Valentini;Marco Chiani
{"title":"Quantum Codes for Asymmetric Channels: ZZZY Surface Codes","authors":"Diego Forlivesi;Lorenzo Valentini;Marco Chiani","doi":"10.1109/LCOMM.2024.3454804","DOIUrl":"10.1109/LCOMM.2024.3454804","url":null,"abstract":"We introduce surface ZZZY codes, a novel family of quantum error-correcting codes designed for asymmetric channels. Derived from standard surface codes through tailored modification of generators, ZZZY codes can be decoded by the minimum weight perfect matching (MWPM) algorithm with a suitable pre-processing phase. The resulting decoder exploits the information provided by the modified generators without introducing additional complexity. ZZZY codes demonstrate a significant performance advantage over surface codes when increasing the channel asymmetry, while maintaining the same correction capability over depolarizing channel.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 10","pages":"2233-2237"},"PeriodicalIF":3.7,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10666750","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Symbiotic NOMA: A Mutualism Communication Paradigm Toward Green Massive Access 共生 NOMA：迈向绿色大规模接入的互助通信范式
IF 3.7 3区 计算机科学
IEEE Communications Letters Pub Date : 2024-09-04 DOI: 10.1109/LCOMM.2024.3454420
Yan Zhang;Lu Lv;Long Yang;Yongjun Xu;Zhiguo Ding;Jian Chen
{"title":"Symbiotic NOMA: A Mutualism Communication Paradigm Toward Green Massive Access","authors":"Yan Zhang;Lu Lv;Long Yang;Yongjun Xu;Zhiguo Ding;Jian Chen","doi":"10.1109/LCOMM.2024.3454420","DOIUrl":"10.1109/LCOMM.2024.3454420","url":null,"abstract":"In this letter, we propose a symbiotic non-orthogonal multiple access (NOMA) mutually reinforcing paradigm for green massive access to better meet the diverse and challenging requirements of Internet-of-Things. In particular, the backscatter device (BD) utilizes the same spectrum resources of the legacy users for reflection while providing beneficial multipath to enhance the performance of legacy transmission. We aim to jointly optimize the active/receive beamforming vectors and reflection coefficients to maximize the weighted sum rate, proving that there is no need to design a dedicated beam for BD via the developed analytical results. Simulation results validate the superiority of the symbiotic NOMA scheme.","PeriodicalId":13197,"journal":{"name":"IEEE Communications Letters","volume":"28 10","pages":"2437-2441"},"PeriodicalIF":3.7,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
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