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Stacked Intelligent Metasurfaces for Integrated Sensing and Communications 用于集成传感与通信的堆叠式智能元表面
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-22 DOI: 10.1109/LWC.2024.3447272
Haoxian Niu;Jiancheng An;Anastasios Papazafeiropoulos;Lu Gan;Symeon Chatzinotas;Mérouane Debbah
{"title":"Stacked Intelligent Metasurfaces for Integrated Sensing and Communications","authors":"Haoxian Niu;Jiancheng An;Anastasios Papazafeiropoulos;Lu Gan;Symeon Chatzinotas;Mérouane Debbah","doi":"10.1109/LWC.2024.3447272","DOIUrl":"10.1109/LWC.2024.3447272","url":null,"abstract":"Stacked intelligent metasurfaces (SIM) have recently emerged as a promising technology, which can realize transmit precoding in the wave domain. In this letter, we investigate a SIM-aided integrated sensing and communications system, in which SIM is capable of generating a desired beam pattern for simultaneously communicating with multiple downlink users and detecting a radar target. Specifically, we formulate an optimization problem of maximizing the spectrum efficiency, while satisfying the power constraint of the desired direction. This requires jointly designing the phase shifts of the SIM and the power allocation at the base station. By incorporating the sensing power constraint into the objective functions as a penalty term, we further simplify the optimization problem and solve it by customizing an efficient gradient ascent algorithm. Finally, extensive numerical results demonstrate the effectiveness of the proposed wave-domain precoder for automatically mitigating the inter-user interference and generating a desired beampattern for the sensing task, as multiple separate data streams transmit through the SIM.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 10","pages":"2807-2811"},"PeriodicalIF":4.6,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142042541","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
Channel-Dependent Power Allocation and Decoding Order for RSMA-Based Uplink Satellite Networks 基于 RSMA 的上行链路卫星网络的信道相关功率分配和解码顺序
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-22 DOI: 10.1109/LWC.2024.3448297
Mehmet Can;Ibrahim Altunbas
{"title":"Channel-Dependent Power Allocation and Decoding Order for RSMA-Based Uplink Satellite Networks","authors":"Mehmet Can;Ibrahim Altunbas","doi":"10.1109/LWC.2024.3448297","DOIUrl":"10.1109/LWC.2024.3448297","url":null,"abstract":"In this letter, we consider a rate-splitting multiple access (RSMA)-based uplink satellite network and propose a dynamic power allocation and decoding order scheme depending on the channel coefficients. The exact outage probability expression of the considered system is derived for the shadowed Rician fading channel. The asymptotic outage probability expression is also obtained, and the coding gain and diversity order of the system are found. Simulation results validate the derived expressions, and it is shown that full diversity can be achieved using the proposed channel-dependent power allocation and decoding order scheme. Furthermore, the proposed scheme is compared with the conventional decoding order and power allocation schemes, and its superior performance is demonstrated.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 10","pages":"2822-2826"},"PeriodicalIF":4.6,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142042526","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
In-Depth Analysis of HARQ Performance in Active RIS-Assisted RSMA Systems 主动 RIS 辅助 RSMA 系统中 HARQ 性能的深入分析
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-21 DOI: 10.1109/LWC.2024.3445503
Yike Zheng;Jie Tang;Beixiong Zheng;Maksim Davydov;Kai-Kit Wong
{"title":"In-Depth Analysis of HARQ Performance in Active RIS-Assisted RSMA Systems","authors":"Yike Zheng;Jie Tang;Beixiong Zheng;Maksim Davydov;Kai-Kit Wong","doi":"10.1109/LWC.2024.3445503","DOIUrl":"10.1109/LWC.2024.3445503","url":null,"abstract":"Utilizing reconfigurable intelligent surface (RIS) technology to construct intelligent radio environments is a prerequisite for developing the sixth-generation (6G) communication networks characterized by ultra-high speed, minimal latency, and extensive connectivity. Therefore, to further enhance the coverage and robustness of wireless communication systems, we investigate an active RIS-assisted rate-splitting multiple access (RSMA) system. Specifically, we examine the effect of relevant parameters on system performance by deriving the analytical expressions of the outage probability (OP) for users employing hybrid automatic repeat request (HARQ) transmission protocol. The numerical results indicate that: 1) Implementing the HARQ transmission protocol can boost signal quality and improve system reliability. 2) The increase in the number of reconfigurable elements also significantly enhances the stability performance of the considered system.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 11","pages":"3074-3078"},"PeriodicalIF":4.6,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142022134","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
SideSeeker: Contention-Based Distributed Relay Finding for Sidelink Mesh Networks SideSeeker：边链路网状网络基于竞争的分布式中继搜索
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-21 DOI: 10.1109/LWC.2024.3447057
Tianxin Wang;Xudong Wang;Yi-Bing Lin
{"title":"SideSeeker: Contention-Based Distributed Relay Finding for Sidelink Mesh Networks","authors":"Tianxin Wang;Xudong Wang;Yi-Bing Lin","doi":"10.1109/LWC.2024.3447057","DOIUrl":"10.1109/LWC.2024.3447057","url":null,"abstract":"Sidelink relays are critical for enabling multi-hop peer-to-peer communications and ensuring connectivity of 6G sidelink mesh networks. To find proper sidelink relays without centralized coordination, a scheme of distributed relay discovery and selection named SideSeeker is designed with two key mechanisms. First, a two-dimensional contention scheme in time and frequency dimensions is designed based on short-term sensing, such that the collision of control signals is alleviated. Second, a mechanism of source-relay pair selection is developed, which prevents data congestion at a certain relay. With SideSeeker, the throughput over sidelinks outperforms those of baseline schemes by 19.4 – 36.9%.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 10","pages":"2802-2806"},"PeriodicalIF":4.6,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142022135","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
Optimal Power Allocation for Over-the-Air Computation With Correlated Data 利用相关数据进行空中计算的最佳功率分配
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-21 DOI: 10.1109/LWC.2024.3446796
Jing Wang;Yiqing Li;Quanzhong Li;Qi Zhang
{"title":"Optimal Power Allocation for Over-the-Air Computation With Correlated Data","authors":"Jing Wang;Yiqing Li;Quanzhong Li;Qi Zhang","doi":"10.1109/LWC.2024.3446796","DOIUrl":"10.1109/LWC.2024.3446796","url":null,"abstract":"Over-the-air computation (AirComp) exploits superposition property of wireless multiple access channels for effective sensing data collection. Existing works on AirComp assume statistically independent sensing data, although in practice sensing data may be correlated with one another. Considering correlated sensing data, we formulate a power allocation optimization problem for achieving the minimum computation mean square error. We transform the formulated problem into a fractional quadratically constrained quadratic problem and propose a semidefinite programming-based scheme to obtain the optimal power allocation factors. It is shown through simulation results that our proposed scheme outperforms the full-power and channel-inversion schemes.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 11","pages":"3079-3083"},"PeriodicalIF":4.6,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142021899","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
Outage Performance of MEC Systems With Joint User Scheduling and Access Point Selection 采用联合用户调度和接入点选择的 MEC 系统的中断性能
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-20 DOI: 10.1109/LWC.2024.3446181
Jun Chang;Bailing Chen;Ding Xu
{"title":"Outage Performance of MEC Systems With Joint User Scheduling and Access Point Selection","authors":"Jun Chang;Bailing Chen;Ding Xu","doi":"10.1109/LWC.2024.3446181","DOIUrl":"https://doi.org/10.1109/LWC.2024.3446181","url":null,"abstract":"The advent of mobile edge computing (MEC) has effectively resolved the challenges associated with computation-intensive applications. In this letter, we investigate a multi-user MEC system with multiple computational access points (CAPs) in the presence of an eavesdropper. In contrast to existing works that only considered user scheduling or CAP selection, we propose a joint user scheduling and CAP selection policy, and derive the system outage probability under the proposed policy in closed form. Simulations are provided to validate the correctness of the theoretical analysis and demonstrate the effectiveness of the proposed policy. The results confirm that the proposed joint user scheduling and CAP selection policy outperforms various existing policies that independently consider user scheduling and CAP selection.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 10","pages":"2792-2796"},"PeriodicalIF":4.6,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142408740","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
A Lightweight UWB NLOS Detection Algorithm Using Referenced CIR Similarity Metrics 使用参考 CIR 相似度指标的轻量级 UWB NLOS 检测算法
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-20 DOI: 10.1109/LWC.2024.3446632
Xu He;Runkun Yang;Lingfei Mo;Xiaolin Meng;Fanxing Yang;Youdong Zhang;Qing Wang
{"title":"A Lightweight UWB NLOS Detection Algorithm Using Referenced CIR Similarity Metrics","authors":"Xu He;Runkun Yang;Lingfei Mo;Xiaolin Meng;Fanxing Yang;Youdong Zhang;Qing Wang","doi":"10.1109/LWC.2024.3446632","DOIUrl":"10.1109/LWC.2024.3446632","url":null,"abstract":"A lightweight and effective algorithm is benefit for real-world applications and edge devices. This letter presents a lightweight algorithm for Non-Line-of-Sight (NLOS) detection in Ultra-Wideband (UWB) systems, using the referenced Channel Impulse Response (CIR) similarity metrics. It retains essential UWB channel characteristics while incorporating a Radar Cross-Section (RCS)-inspired feature engineering method to capture the effective NLOS representation. It bears novel features to significantly reduce the input data dimensions, model parameters, and Floating-point operations (Flops) by 64.9%, 78.5%, 76.0%, respectively, with comparable performance to the latest State-Of-The-Art (SOTA) solutions. We demonstrate its effectiveness through actual measurements and comparative experiments in mixed complex Line-Of-Sight (LOS)/NLOS dataset, offering a computationally efficient solution for UWB NLOS detection with effective representation.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 10","pages":"2797-2801"},"PeriodicalIF":4.6,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142021902","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 Throughput and Blocklength Optimization for RIS-Aided Hybrid Multi-Access Short-Packet System RIS 辅助混合多接入短分组系统的联合吞吐量和块长优化
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-20 DOI: 10.1109/LWC.2024.3446033
Hong Wang;Yibo Fu;Zheng Shi;Youhong Feng
{"title":"Joint Throughput and Blocklength Optimization for RIS-Aided Hybrid Multi-Access Short-Packet System","authors":"Hong Wang;Yibo Fu;Zheng Shi;Youhong Feng","doi":"10.1109/LWC.2024.3446033","DOIUrl":"10.1109/LWC.2024.3446033","url":null,"abstract":"Hybrid multi-access that integrates non-orthogonal multiple access (NOMA) and orthogonal multiple access (OMA), provides greater flexibility in accessing a diverse range of device types and a vast number of devices. This letter investigates a reconfigurable intelligent surface (RIS) aided hybrid NOMA-OMA short-packet (RAHNOSP) system, where NOMA and OMA devices transmit messages to the access point aided by an RIS. Specifically, we focus on optimizing the throughput and the blocklength in the RAHNOSP system. To this end, we formulate a multi-objective optimization (MOO) problem that aims to maximize throughput and minimize blocklength simultaneously. To make the MOO problem tractable, the Chebyshev transformation is invoked to convert the MOO into a single-objective optimization problem, and then we decompose the transformed problem into two subproblems and solve them by using alternating optimization. Numerical results demonstrate that the proposed hybrid NOMA-OMA scheme outperforms the existing strategies in terms of throughput-blocklength tradeoff.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 10","pages":"2787-2791"},"PeriodicalIF":4.6,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142022138","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
Active RIS-Assisted Receive Space Shift Keying With Reflection Modulation 带反射调制的有源 RIS 辅助接收空移键控
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-19 DOI: 10.1109/LWC.2024.3445713
Junzhou Xiong;Guoquan Li;Yongcun Guo;Yu Pang
{"title":"Active RIS-Assisted Receive Space Shift Keying With Reflection Modulation","authors":"Junzhou Xiong;Guoquan Li;Yongcun Guo;Yu Pang","doi":"10.1109/LWC.2024.3445713","DOIUrl":"10.1109/LWC.2024.3445713","url":null,"abstract":"In this letter, an active reconfigurable intelligent surface (RIS)-assisted receive space shift keying with reflection modulation (ARIS-RSSK-RM) scheme is proposed to mitigate the multiplicative fading existed in RIS-assisted systems and improve the spectral efficiency. In the scheme, the transmitter emits only an unmodulated carrier, and the reflecting elements of RIS are divided into groups that can be configured as passive or active states. The information is carried by the receive antenna indices and the number of active reflecting element groups. The pairwise error probability of the ARIS-RSSK-RM scheme is derived based on the moment generating function, and then an upper bound on theoretical bit error probability is obtained. Simulation results confirm the accuracy of the theoretical derivation and demonstrate that the proposed ARIS-RSSK-RM scheme has superior performance in terms of bit error rate and robustness.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 10","pages":"2782-2786"},"PeriodicalIF":4.6,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142007579","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
Movable Antenna Empowered Downlink NOMA Systems: Power Allocation and Antenna Position Optimization 可移动天线下行链路 NOMA 系统：功率分配和天线位置优化
IF 4.6 3区 计算机科学
IEEE Wireless Communications Letters Pub Date : 2024-08-19 DOI: 10.1109/LWC.2024.3445110
Yufeng Zhou;Wen Chen;Qingqing Wu;Xusheng Zhu;Nan Cheng
{"title":"Movable Antenna Empowered Downlink NOMA Systems: Power Allocation and Antenna Position Optimization","authors":"Yufeng Zhou;Wen Chen;Qingqing Wu;Xusheng Zhu;Nan Cheng","doi":"10.1109/LWC.2024.3445110","DOIUrl":"10.1109/LWC.2024.3445110","url":null,"abstract":"This letter investigates a novel communication paradigm employing movable antennas (MAs) within a multiple-input single-output (MISO) non-orthogonal multiple access (NOMA) downlink framework, where users are equipped with MAs. Initially, leveraging the far-field response, we delineate the channel characteristics concerning both the power allocation coefficient and positions of MAs. Subsequently, we endeavor to maximize the channel capacity by jointly optimizing power allocation and antenna positions. To tackle the resultant non-concave problem, we propose an alternating optimization (AO) scheme underpinned by successive convex approximation (SCA) to converge towards a stationary point. Through numerical simulations, our findings substantiate the superiority of the MA-assisted NOMA system over both orthogonal multiple access (OMA) and conventional NOMA configurations in terms of average sum rate and outage probability.","PeriodicalId":13343,"journal":{"name":"IEEE Wireless Communications Letters","volume":"13 10","pages":"2772-2776"},"PeriodicalIF":4.6,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142007578","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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