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Channel Estimation for RIS-aided mmWave Communications via 3D Positioning 基于三维定位的ris辅助毫米波通信信道估计
Pub Date : 2021-07-28 DOI: 10.1109/ICCCWorkshops52231.2021.9538860
Yaoshen Cui, Haifan Yin
Millimeter-wave (mmWave) communication is one of the key technologies for the fifth-generation cellular networks (5G). However, one of the fundamental problems of mmWave communication is the susceptibility to blockage effects. One way to alleviate this effect is the use of Reconfigurable Intelligent Surface (RIS). Nevertheless, due to the large number of passive reflecting elements on RIS, the channel estimation turns out to be a challenging task. This paper proposes a novel 3D localization technology to achieve the low-complexity channel estimation for RIS-aided mmWave communication system. Our idea consists of exploiting the sparsity of the mmWave channel and the topology of RIS itself. In particular, we propose the concept of reflecting unit set (RUS) and a coplanar maximum likelihood-based (CML) efficient 3D positioning method, and derive the corresponding Cramer-Rao Lower Bounds (CRLB) in close-form. Compared to state-of-the-art methods, our proposed method requires less time-frequency resource in channel acquisition. Large performance gains are confirmed in simulation, which proves the effectiveness of our proposed method.
毫米波通信是第五代蜂窝网络(5G)的关键技术之一。然而,毫米波通信的一个基本问题是对阻塞效应的敏感性。缓解这种影响的一种方法是使用可重构智能表面(RIS)。然而,由于RIS上有大量的被动反射元素,信道估计成为一项具有挑战性的任务。为实现ris辅助毫米波通信系统的低复杂度信道估计,提出了一种新的三维定位技术。我们的想法包括利用毫米波信道的稀疏性和RIS本身的拓扑结构。特别地,我们提出了反射单元集(RUS)的概念和基于共面最大似然(CML)的高效三维定位方法,并推导了相应的crmer - rao下界(CRLB)。与现有方法相比,该方法在信道获取中需要较少的时频资源。仿真结果验证了该方法的有效性。
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引用次数: 4
Survey on Space-air-ground Integrated Networks in 6G 6G空间-地空一体化网络研究进展
Pub Date : 2021-07-28 DOI: 10.1109/ICCCWorkshops52231.2021.9538859
Heng Wang, Xu Xia, Tangyijia Song, Yanxia Xing
With 6G receiving more and more attention, the space-air-ground integrated networks (SAGIN) have become the key research content of the next generation communication. This paper investigates the current development status of SAGIN, discusses the key technologies of SAGIN. In addition, the prospect and conception of the application of SAGIN in 6G are presented
随着6G越来越受到重视,天空地一体化网络(SAGIN)已成为下一代通信的重点研究内容。本文综述了SAGIN的发展现状,讨论了SAGIN的关键技术。最后,对SAGIN在6G网络中的应用前景和构想进行了展望
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引用次数: 9
A Review of 3GPP Release 18 on Smart Energy and Infrastructure 3GPP第18版《智慧能源与基础设施》综述
Pub Date : 2021-07-28 DOI: 10.1109/ICCCWorkshops52231.2021.9538875
Xu Xia, Chengli Mei, Xiaodong Zhou, Sheng Wang, Heng Wang, Yanxia Xing
The objective of this paper is to identify and specify 5G service requirements for Smart Grid applications and operation. Specifically, this paper shall address the following requirements on 3GPP: First, the requirements for communication performance requirements include capacity, latency, availability, end-to-end QoS, resilience/redundancy and security. Second, consider deployment requirements for constraints. Third, consider service requirements for enabling microgrids, DER and specifically distributed generation (DG) that require 5G wireless communication. Fourth, the requirement for potential service function requirements include distributed power supply system and distribution automation. Finally, consider additional requirements due to operational manageability.
本文的目的是确定和明确智能电网应用和运行的5G业务需求。具体而言,本文主要针对3GPP的以下要求:一是通信性能要求,包括容量、时延、可用性、端到端QoS、弹性/冗余和安全性。其次,考虑约束的部署需求。第三,考虑启用需要5G无线通信的微电网、DER和分布式发电(DG)的服务需求。第四,潜在业务功能需求包括分布式供电系统和配电自动化。最后,考虑由于操作可管理性而产生的额外需求。
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引用次数: 2
A Low-Complexity Approximate Message Passing Equalizer for OTFS system 一种用于OTFS系统的低复杂度近似消息传递均衡器
Pub Date : 2021-07-28 DOI: 10.1109/ICCCWorkshops52231.2021.9538883
Yang Zhang, Qunfei Zhang, Lingling Zhang, Chengbing He, Xinyuan Tian
The orthogonal time frequency space (OTFS) modulation has emerged as a potential candidate modulation scheme for high mobility wireless communications. However, OTFS may experience significant inter-Doppler interference (IDI) and inter-symbol interference (ISI) occur in the receiver. To jointly combat both interferences, we propose an efficient improved approximate message passing (AMP) equalizer for OTFS transmission over delay-Doppler channels in this paper. Specifically, a decoupling operation can be performed for joint interference cancellation, and the sparse feature of equivalent channel matrix is utilized in delay-Doppler domain. Then, the posterior mean and variance estimates of the transmitted symbol is reconstructed by the denoising step. Furthermore, a threshold-based convergence scheme is proposed with the purpose of trade-off the computational complexity and performance of the OTFS system. Simulation results demonstrate that the proposed improved AMP equalizer exhibits a better bit error rate (BER) performance with a reduced complexity compared to its conventional counterparts.
正交时频空间(OTFS)调制已成为高移动性无线通信的一种潜在的候选调制方案。然而,OTFS可能会遇到显著的多普勒间干扰(IDI)和符号间干扰(ISI)发生在接收机。为了共同对抗这两种干扰,我们提出了一种有效的改进的近似消息传递(AMP)均衡器,用于延迟多普勒信道上的OTFS传输。具体来说,通过解耦运算消除联合干扰,并在延迟多普勒域利用等效信道矩阵的稀疏特性。然后,通过去噪步骤重建传输符号的后验均值和方差估计。此外,为了权衡OTFS系统的计算复杂度和性能,提出了一种基于阈值的收敛方案。仿真结果表明,与传统的均衡器相比,改进的AMP均衡器具有更好的误码率(BER)性能和更低的复杂度。
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引用次数: 1
Input-Output Relation Analysis of OTFS modulation over Rapid Linear Time-Variant Channels 快速线性时变信道OTFS调制的输入输出关系分析
Pub Date : 2021-07-28 DOI: 10.1109/ICCCWorkshops52231.2021.9538868
Haoyan Liu, Min Yang, Yanming Liu, Qiongjie Zhang
Orthogonal time-frequency space (OTFS) is an emerging two-dimensional modulation technology, which converts the delay-Doppler domain symbols to the time domain signals through cascaded orthogonal transforms for transmission. OTFS has been verified to be effective against Doppler shift in quasistatic channels. However, the dynamic Doppler channels have not been paid attention to yet. Furthermore, the power of the received signal will change in some practical systems. A more general linear time-variant (LTV) channel is considered in this paper, where it is assumed that the signal propagating in each path has experienced a unique rapid amplitude fading and phase jitter. We derive the explicit input-output relation of OTFS in the delay-Doppler domain for the case of ideal pulse. Simulation results reveal that OTFS obtain time diversity gain and still outperforms orthogonal frequency-division multiplexing (OFDM) in rapid fading channels.
正交时频空间(OTFS)是一种新兴的二维调制技术,它通过级联正交变换将延迟多普勒域信号转换为时域信号进行传输。在准静态信道中,OTFS对多普勒频移有效。然而,动态多普勒信道尚未引起人们的重视。此外,在一些实际系统中,接收信号的功率会发生变化。本文考虑了一种更一般的线性时变(LTV)信道,其中假设信号在每条路径上传播都经历了独特的快速幅度衰减和相位抖动。在理想脉冲的情况下,导出了延时多普勒域OTFS的显式输入输出关系。仿真结果表明,在快速衰落信道中,OTFS在获得时分集增益的同时仍优于正交频分复用(OFDM)。
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引用次数: 0
Wireless Communication with Extremely Large-Scale Intelligent Reflecting Surface 超大规模智能反射面无线通信
Pub Date : 2021-06-11 DOI: 10.1109/ICCCWorkshops52231.2021.9538864
Chao Feng, Haiquan Lu, Yong Zeng, Shi Jin, Rui Zhang
Intelligent reflecting surface (IRS) is a promising technology for wireless communications, thanks to its potential capability to engineer the radio environment. However, in practice, such an envisaged benefit is attainable only when the passive IRS is of a sufficiently large size, for which the conventional uniform plane wave (UPW)-based channel model may become inaccurate. In this paper, we pursue a new channel modelling and performance analysis for wireless communications with extremely large-scale IRS (XL-IRS). By taking into account the variations in signal’s amplitude and projected aperture across different reflecting elements, we derive both lower- and upper-bounds of the received signal-to-noise ratio (SNR) for the general uniform planar array (UPA)-based XL-IRS. Our results reveal that, instead of scaling quadratically with the increased number of reflecting elements M as in the conventional UPW model, the SNR under the more practically applicable non-UPW model increases with M only with a diminishing return and gets saturated eventually. To gain more insights, we further study the special case of uniform linear array (ULA)-based XL-IRS, for which a closed-form SNR expression in terms of the IRS size and transmitter/receiver location is derived. This result shows that the SNR mainly depends on the two geometric angles formed by the transmitter/receiver locations with the IRS, as well as the boundary points of the IRS. Numerical results validate our analysis and demonstrate the importance of proper channel modelling for wireless communications aided by XL-IRS.
智能反射面(IRS)是一种很有前途的无线通信技术,由于它具有设计无线电环境的潜在能力。然而,在实践中,只有当无源IRS具有足够大的尺寸时,才能实现这种设想的效益,而传统的基于均匀平面波(UPW)的通道模型可能会变得不准确。在本文中,我们对具有超大规模IRS (xml -IRS)的无线通信进行了新的信道建模和性能分析。通过考虑信号振幅和投影孔径在不同反射元件上的变化,我们推导了基于一般均匀平面阵列(UPA)的XL-IRS的接收信噪比(SNR)的下界和上界。我们的研究结果表明,与传统UPW模型中随着反射元素M数量的增加而二次成比例不同,在更实际适用的非UPW模型中,信噪比随着M的增加而增加,但收益递减,最终趋于饱和。为了获得更多的见解,我们进一步研究了基于均匀线性阵列(ULA)的xml -IRS的特殊情况,推导了IRS大小和发射机/接收机位置的封闭形式信噪比表达式。结果表明,信噪比主要取决于发射/接收位置与IRS形成的两个几何角度,以及IRS的边界点。数值结果验证了我们的分析,并证明了适当的信道建模对xml - irs辅助无线通信的重要性。
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引用次数: 17
Cell-Free Symbiotic Radio: Channel Estimation Method and Achievable Rate Analysis 无细胞共生无线电:信道估计方法和可达速率分析
Pub Date : 2021-06-11 DOI: 10.1109/ICCCWorkshops52231.2021.9538923
Zhuoyin Dai, Ruoguang Li, Jingran Xu, Yong Zeng, Shi Jin
Cell-free massive MIMO and symbiotic radio are promising beyond 5G(B5G) networking architecture and transmission technology, respectively. This paper studies cell-free symbiotic radio systems, where a number of distributed access points (APs) cooperatively send primary information to a receiver, and simultaneously support the backscattering communication of the secondary backscatter device (BD). An efficient two-phase uplink-training based channel estimation method is proposed to estimate the direct-link channel and cascaded backscatter channel, and the achievable primary and secondary communication rates taking into account the channel estimation errors are derived. Furthermore, to achieve a flexible trade-off between the primary and secondary communication rates, we propose a low-complexity weighted-maximal-ratio transmission (weighted-MRT) beamforming scheme, which only requires local processing at each AP without having to exchange the estimated channel state information. Simulation results are provided to show the impact of the channel training lengths on the performance of the cell-free symbiotic radio systems.
无蜂窝大规模MIMO和共生无线电分别是超越5G(B5G)网络架构和传输技术的前景。本文研究了无蜂窝共生无线电系统,其中多个分布式接入点(ap)协同向接收机发送主信息,同时支持二次后向散射设备(BD)的后向散射通信。提出了一种有效的基于两相上行链路训练的信道估计方法,用于估计直连信道和级联后向散射信道,并推导了考虑信道估计误差的可实现主、次通信速率。此外,为了实现主从通信速率之间的灵活权衡,我们提出了一种低复杂度加权最大比传输(加权mrt)波束形成方案,该方案只需要在每个AP进行本地处理,而无需交换估计的信道状态信息。仿真结果显示了信道训练长度对无小区共生无线电系统性能的影响。
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引用次数: 10
Rate Splitting Multiple Access for Joint Communication and Sensing Systems with Unmanned Aerial Vehicles 无人机联合通信与传感系统的分频多址
Pub Date : 2020-11-14 DOI: 10.1109/ICCCWorkshops52231.2021.9538915
Yuwei Li, Wanli Ni, Hui Tian, Meihui Hua, Shaoshuai Fan
This paper investigates the problem of resource allocation for joint communication and radar sensing system on rate-splitting multiple access (RSMA) based unmanned aerial vehicle (UAV) system. UAV simultaneously communicates with multiple users and probes signals to targets of interest to exploit cooperative sensing ability and achieve substantial gains in size, cost and power consumption. By virtue of using linearly precoded rate splitting at the transmitter and successive interference cancellation at the receivers, RSMA is introduced as a promising paradigm to manage interference as well as enhance spectrum and energy efficiency. To maximize the energy efficiency of UAV networks, the deployment location and the beamforming matrix are jointly optimized under the constraints of power budget, transmission rate and approximation error. To solve the formulated non-convex problem efficiently, we decompose it into the UAV deployment subproblem and the beamforming optimization subproblem. Then, we invoke the successive convex approximation and difference-of-convex programming as well as Dinkelbach methods to transform the intractable subproblems into convex ones at each iteration. Next, an alternating algorithm is designed to solve the non-linear and non-convex problem in an efficient manner, while the corresponding complexity is analyzed as well. Finally, simulation results reveal that proposed algorithm with RSMA is superior to orthogonal multiple access and power-domain non-orthogonal multiple access in terms of power consumption and energy efficiency.
研究了基于速率分裂多址(RSMA)的无人机系统中联合通信和雷达传感系统的资源分配问题。无人机同时与多个用户通信,探测信号到感兴趣的目标,利用协同传感能力,在尺寸、成本和功耗方面取得实质性的收益。由于在发送端使用线性预编码速率分裂,在接收端使用连续干扰消除,RSMA被引入作为一种有前途的范例来管理干扰以及提高频谱和能源效率。为了使无人机网络的能源效率最大化,在功率预算、传输速率和近似误差约束下,对部署位置和波束形成矩阵进行了联合优化。为了有效地求解公式化的非凸问题,我们将其分解为无人机部署子问题和波束成形优化子问题。然后,我们利用连续凸逼近和凸差分规划以及Dinkelbach方法在每次迭代中将棘手的子问题转化为凸问题。其次,设计了一种交替算法,以有效地求解非线性非凸问题,并分析了相应的复杂性。仿真结果表明,该算法在功耗和能效方面均优于正交多址和功率域非正交多址。
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引用次数: 4
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2021 IEEE/CIC International Conference on Communications in China (ICCC Workshops)
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