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Near-field channel estimation for extremely large-scale Terahertz communications

Science China(Information Sciences) 2024年第9期67卷 213-228页

作者： Songjie YANG Yizhou PENG Wanting LYU Ya LI Hongjun HE zhongpei zhang Chau YUEN National Key Laboratory of Wireless Communications University of Electronic Science and Technology of China Future Research Laboratory China Mobile Research Institute School of Electrical and Electronics Engineering Nanyang Technological University

Future Terahertz communications exhibit significant potential in accommodating ultra-high-rate services. Employing extremely large-scale array antennas is a key approach to realize this potential, as they can harness substantial beamforming gains to overcome the severe path loss and leverage the electromagnetic advantages in the near field. This paper proposes novel estimation methods designed to enhance efficiency in Terahertz widely-spaced multi-subarray(WSMS) systems. Initially, we introduce three sparse channel representation methods: polar-domain representation(PD-R), multi-angular-domain representation(MADR), and two-dimensional polar-angular-domain representation(2D-PAD-R). Each method is meticulously developed for near-field WSMS channels, capitalizing on their sparsity characteristics. Building on this,we propose four estimation frameworks using the sparse recovery theory: polar-domain estimation(PD-E),multi-angular-domain estimation(MAD-E), two-stage polar-angular-domain estimation(TS-PAD-E), and two-dimensional polar-angular-domain estimation(2D-PAD-E). Particularly, 2D-PAD-E, integrating a 2D dictionary process, and TS-PAD-E, with its sequential approach to angle and distance estimation, stand out as particularly effective for near-field angle-distance estimation, enabling decoupled calculation of these parameters. Overall, these frameworks provide versatile and efficient solutions for WSMS channel estimation,balancing low complexity with high-performance outcomes. Additionally, they represent a fresh perspective on near-field signal processing.

关键词： Terahertz communications near field channel estimation widely-spaced multi-subarray sparse recovery

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Competitive access in multi-RAT systems with regulated interference constraints

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Science China(Information Sciences) 2017年第2期60卷 96-106页

作者： Ning WEI zhongpei zhang National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China

Deployment of multiple radio access technologies(RATs) at the same cell site enables the system to flexibly support different types of devices and services. Such multi-RAT systems call for an efficient utilization of the system resources as well as simplified management. In this paper, we take a user-centric approach and let each individual user equipment decide its own access strategy in a multi-RAT system with regulated interference constraints. The formulated problem is a generalized Nash equilibrium(GNE) problem. We show that there always exists a GNE but its uniqueness is not guaranteed. A closed form solution is provided to characterize a special class of the GNEs. We then propose a primal-dual algorithm with detailed convergence analysis for computing a GNE. The proposed algorithm may have practical implications in the design of multi-RAT systems.

关键词： 5G multi-RAT systems multiple access distributed algorithms generalized Nash equilibrium

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Mode Selection for CoMP Transmission with Nonideal Synchronization

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China Communications 2018年第12期15卷 132-146页

作者： Zheqi Gu zhongpei zhang Chengdu Research Institute HUAWEI Technology Co. Ltd National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of China

This paper proposes a mode selection scheme to improve the spectral efficiency for coordinated multi-point(CoMP) transmission with phase synchronization errors(PSE). Upper bounds of average achievable rate for different CoMP transmission modes, such as coordinated beamforming(CB) and joint processing(JP), are derived by random matrix theory and asymptotic mathematical approximation. According to these upper bounds, the proposed scheme switches CoMP transmission mode between CB and JP adaptively to enhance the average achievable rate. Simulation results show that these upper bounds agree well with the average achievable rates for both JP and CB, and the proposed scheme outperforms traditional single mode CoMP transmission when PSE exist.

关键词： CoMP transmission synchronization errors precoding mode selection

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Clustering Approaches for Overhead Reduction over Coordinated Multiple Points Network-MIMO Downlink Systems

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China Communications 2010年第5期7卷 103-111页

作者： Xiao Shanghui zhang zhongpei Shi Zhiping National Key Lab of Communication University of Electronic Science and Technology of China Chengdu 611731 P. R. China School of Physics and Electronic Engineering Yibin University Yibin 644007 P. R. China National Mobile Communications Research Lab Southeast University Nanjing 211189 P. R. China

Owing to the potential for intercell cochannel interference mitigation and significant spectral efficiency improvement, coordinating transmission techniques by multiple radio access points have recently attracted a lot of attention. In this paper, the system structure and mathematical signal model based on clustered structure are presented for multipoint coordinating downlink transmission, the clustered supercell configurations with static/dynamic approaches are discussed, and then optimal precod- ing design is provided for an accepted level of scheduling complexity and reduced signaling over- head. Some simulation results are given to evaluate the performance of different cell-clustering approaches, and to show that a clustered supercell size of 7 is a reasonable choice for clustered coordination with the given transmit power and the reduced feedback.

关键词： overhead reduction clustering approa-ches supercell MIMO ss stems cooperative com-munication

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The analysis of coverage probability,ASE and EE in heterogeneous ultra-dense networks with power control

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Digital Communications and Networks 2020年第4期6卷 524-533页

作者： Qiaoshou Liu zhongpei zhang National Key Laboratory of Science and Technology on Communications University of Electronic Science and Technology of ChinaChengdu611731China Key Laboratory of Optical Communication and Networks Chongqing University of Posts and TelecommunicationsChongqing400065China

The ultra-dense network is a promising technology to increase the network capacity in the forthcoming fifthgeneration(5G)mobile communication networks by deploying lots of low power Small Base Stations(SBSs)which overlap with Macro Base Stations(MBSs).The interference and energy consumption increase rapidly with the number of SBSs although each SBS transmits with small *** this paper,we model a downlink heterogeneous ultra-dense network where a lot of SBSs are randomly deployed with MBSs based on the Poisson point *** derive the coverage probability and its variance,and analyze the area spectral efficiency and energy efficiency of the network considering three Fractional Power Control(FPC)*** numerical results and Monte Carlo simulation results show that power control can mitigate the interference and balance the performances of inner-user and edge-user ***,a great improvement of energy efficiency is archived with a little loss of area spectral efficiency when FPC is ***,we analyze the effect of base stations’(BSs’)sleeping on the performance of the network when it is partially loaded.

关键词： Heterogeneous ultra-dense network Poisson point process Coverage probability Area spectral efficiency Energy efficiency

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产业数字化通用方法及其应用探讨

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现代工业经济和信息化 2024年第9期14卷 83-87页

作者：赵心依张忠培北京邮电大学经济管理学院北京100876 电子科技大学抗干扰全国重点实验室四川成都611731

依据产业数字化理论与实践以及项目规模小、复杂度高、相似度低、周期长的特点,结合其主要挑战,给出技术、经济和管理相结合的分层通用方法。该方法以数字化产业生态为支撑、数字化技术体系为基础、业务体系为核心,产业生态既有数字产... 详细信息

依据产业数字化理论与实践以及项目规模小、复杂度高、相似度低、周期长的特点,结合其主要挑战,给出技术、经济和管理相结合的分层通用方法。该方法以数字化产业生态为支撑、数字化技术体系为基础、业务体系为核心,产业生态既有数字产业化的规模化和标准化又有行业企业的定制化更有企业自身专有知识发掘和保护,数字技术体系包括技术模型和连接模型,连接在于价值传递以及梅特卡夫网络效应发挥,业务体系全要素全流程贯通,学习模型体现了迭代进化。通过不同实例论证了该通用方法。

关键词：数字化产业生态通用方法实例化

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多期构造应力控制走滑断控储层发育机理与差异性研究——以塔里木盆地顺北地区为例

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石油实验地质 2024年第4期46卷 775-785页

作者：张继标邓尚韩俊李映涛刘大卫邱华标张仲培刘雨晴中国石化石油勘探开发研究院北京100083 中国石化西北油田分公司乌鲁木齐830011

塔里木盆地顺北油气田发育典型走滑断控缝洞型储层。区别于受原始沉积相带控制的基质孔洞、受岩溶改造的洞穴等储集类型,走滑断控缝洞型储层的形成主要受断裂活动期构造应力导致的破裂作用控制。为研究走滑断裂多期活动背景下构造应力... 详细信息

塔里木盆地顺北油气田发育典型走滑断控缝洞型储层。区别于受原始沉积相带控制的基质孔洞、受岩溶改造的洞穴等储集类型,走滑断控缝洞型储层的形成主要受断裂活动期构造应力导致的破裂作用控制。为研究走滑断裂多期活动背景下构造应力控制的断控储层发育机理与分布规律,综合应用野外、岩心、测录井、地震及钻井动态等资料,开展不同走滑断裂、同一走滑断裂沿走向不同部位、垂向不同层系断控储层发育特征表征,并结合应力场数值模拟手段开展多期构造应力恢复,预测断控储层发育的主要时期与分布规律。结果表明,走滑断裂活动期不同分段内部应力状态差异显著,其中拉分段内部以张应力为主,主要派生张性裂缝;压隆段内部以挤压应力为主,派生裂缝类型多样。顺北地区勘探目的层奥陶系一间房组顶面断控裂缝主要在加里东中期Ⅲ幕及加里东晚期—海西早期发育,海西中—晚期及之后裂缝基本不发育,且滑移距大的顺北18号断裂带较顺北1号断裂带派生裂缝开度、密度更高。走滑断控储层具有“簇状”结构特征,断裂活动期不同分段内部应力状态控制储层结构差异,拉分段“空腔”多,以“双簇”结构为主,核带规模大,压隆段核带结构多,以“多簇”结构为主,分割性强;走滑断裂活动期应力强度控制储集空间类型与规模,小型断裂储集空间以裂缝为主,大型断裂带发育核带结构,断控储层规模与断裂活动强度呈正相关关系;断控裂缝发育主要受断裂早期活动控制,晚期由于地层埋深增大,岩石不易破裂,新派生裂缝发育较少。

关键词：应力状态多期构造应力分段性断控缝洞型储层顺北地区塔里木盆地

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Collaborative beamforming based on directional perturbation using one bit feedback

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Journal of Systems Engineering and Electronics 2016年第3期27卷 549-554页

作者： Haifen Yang Ning Ding Zhi Zheng Shuisheng Lin zhongpei zhang Guangjun Li School of Communication & Information Engineering University of Electronic Science and Technology of China

A novel collaborative beamforming algorithm is proposed in a wireless communication system with multiple transmitters and one receiver. All transmitters take part in the collaboration and the weighted message is transmitted simultaneously. In order to maximize the beamforming gain, the transmitters use one bit feedback information to adjust the phase offset. It tracks the direction in which the signal strength at the receiver can increase. The directional search and perturbation theory is used to achieve the phase alignment. The feasibility of the proposed algorithm is proved both experimentally and theoretically. Simulation results show that the proposed algorithm can improve the convergent speed of the phase alignment.

关键词： collaborative beamforming one-bit feedback directional perturbation convergent speed

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Deformation patterns and hydrocarbon potential related to intracratonic strike-slip fault systems in the east of Central Uplift Belt in the Tarim Basin

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Energy Geoscience 2022年第1期3卷 63-72页

作者： Fei Ning Jinbiao Yun zhongpei zhang Peng Li Laboratory of Structural and Sedimentological Reservoir Geology Exploration&Production Research InstituteSINOPECBeijing100083China Exploration&Production Research Institute SINOPECBeijing100083China Geology and Geophysics Department University of Wyoming82071USA

Strike-slip faults,proven to be closely linked to hydrocarbon migration and accumulation,are wide-spread in the Tarim Basin *** patterns in the eastern part of the Central Uplift Belt of the Tarim Basin are analyzed in detail to understand the deformation model and genetic mechanism of strike-slip faults,how their patterns impact reservoir formation and influence oil and gas *** tectonic events are taken into consideration to identify the primary factors that controlled the development of strike-slip faults in the *** Tazhong Uplift in the eastern part of Central Uplift Belt is believed to be a complex anticlinal uplift formed by compression-and-torsion acting on the Cambrian-Middle Ordovician platform during the middle-late Caledonian ***-stage development of this north-trending fault-fold belt and the NE-trending strike-slip faults make it structurally *** NE-trending Paleozoic strike-slip faults were formed jointly by the differential thrusting of the Tazhong Uplift along Fault No.Ⅰand the NE-trending shear sliding of the basal fault blocks during the middle-late Caledonian-early *** on the distribution of effective source rocks,the tectonic setting during the period critical to hydrocarbon accumulation,and the distribution of conductive faults,the northern slope of the Tazhong Upliftd-especially its west-central part where the NE-trending faults are developed is not only located close to the northern hydrocarbon source rock area but also possesses conditions suitable for the development of carbonate *** addition,the NE-trending faults provide passage for initial development of the reservoir and the subsequent migration of oil and gas from the Aman area to the uplifted zone,making the Tazhong Uplift an extremely favorable area for oil and gas accumulation with substantial potential for exploration.

关键词： Strike-slipfault Deformation pattern Hydrocarbon accumulation Craton Tarim basin

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鄂尔多斯盆地旬宜地区下古生界走滑断裂特征与油气勘探意义

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石油实验地质 2024年第2期46卷 342-353页

作者：王启超刘光祥吴疆岳欣欣孙自明张军涛高晓鹏刘玲鲁锴张仲培中国石化石油勘探开发研究院北京102206 中国石化深部地质与资源重点实验室北京102206 中国石化河南油田分公司河南南阳473400

近年来随着勘探和认识程度的加深,鄂尔多斯盆地不再被认为是“铁板”一块,盆地内多期多套断裂系统对油气成藏的控制作用越来越受重视。选取盆地南部旬邑—宜君(旬宜)地区,基于最新三维地震资料与钻井资料,应用走滑断裂理论模型,开展了... 详细信息

近年来随着勘探和认识程度的加深,鄂尔多斯盆地不再被认为是“铁板”一块,盆地内多期多套断裂系统对油气成藏的控制作用越来越受重视。选取盆地南部旬邑—宜君(旬宜)地区,基于最新三维地震资料与钻井资料,应用走滑断裂理论模型,开展了断裂几何学与运动学分析,预测了断裂形成机制,并探讨了其对深层碳酸盐岩成储、成藏的控制作用。旬宜地区发育3套断裂系统,且存在深、浅层脱耦现象,下古生界走滑断裂在剖面上呈高陡直立、倾向摆动、“花”状构造等典型特征,平面上表现为“北西部挤压剪切、中部拉张剪切、主干断裂分段变形”。下古生界走滑断裂经历了两期构造活动,其中晚奥陶世至志留纪活动强度较大,为断层主要发育期,中—晚二叠世活动强度较弱,断层呈继承性走滑,形成北东、北西走向两组左行走滑断裂。鄂尔多斯盆地南部可能存在北东和北西向的基底薄弱带,加里东期Ⅱ幕洋盆俯冲闭合向盆内传递应力,斜向挤压导致旬宜地区基底断裂活化,是下古生界走滑断裂系统形成的主要动力机制。下古生界走滑断裂可有效改善深层碳酸盐岩储层物性,形成岩溶型或构造裂缝型优质储层,沿走滑断裂带形成“上生下储—旁生侧储”型成藏组合,是旬宜地区深层油气勘探值得关注的重点领域。

关键词：走滑断裂断裂特征形成机制油气勘探下古生界旬宜地区鄂尔多斯盆地

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