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research Framework of B3G mobile communications Systems

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ZTE communications 2006年第2期4卷 29-34页

作者： Chen Ming, you xiaohu (national mobile communications research laboratory, Southeast University, Nanjing 210096, China)

Compared with the services in 3G, services in Beyond 3G (B3G) have some distinctive characteristics such as the packet data services being the majority, more service types, larger scale of services, higher peak transmission rate, enlarged range of transmission rates, more spatial and temporal distribution differences, and more service transmission requests occurring in fast moving vehicles. In order to meet the requirements of B3G services, the B3G systems must have great improvement in network architecture, air interface scheme, radio resource allocation strategy, frequency bands, and Radio Frequency (RF) technology etc. Therefore, the research of the B3G systems should focus on the theory of generalized cellular communications networks, theory of the Multiple Input Multiple Output (MIMO) wireless transmission system, matching of radio resources to new-type air interfaces, new iterative detection and adaptive link methods, and new-type antenna and RF technologies.

关键词： MIMO IEEE USA research Framework of B3G mobile communications Systems

Design of the Number of Subcarriers for OFDM Systems in Time-Varying Fading Channels

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Design of the Number of Subcarriers for OFDM Systems in Time...

宽带CDMA系统中最大多普勒频移估计方法的研究

数字出版背景下的数字内容安全——2010年亚太信息网络...

作者： Laili WANG bin sheng national mobile communications research laboratory Southeast University nanjing China 210096

In this paper,the mean capacity of an orthogonal frequency division multiplexing（OFDM）system with a given overall bandwidth and cyclic prefix（CP）length is investigated and the number of subcarriers is optimized to... 详细信息

关键词： Interchannel interference（ICI） orthogonal frequency division multiplexing（OFDM） maximum Doppler frequency

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通信学报 2004年第6期25卷 157-165页

作者：盛彬尤肖虎东南大学移动通信国家重点实验室江苏南京210096

估计最大多普勒频移或者是移动台的速度对于优化接收机的性能至关重要。本文主要研究了宽带码分多址通信系统中四种最大多普勒频移的估计方法并通过对WCDMA系统的理论计算和计算机仿真比较了它们在具有各向同性散射体和高斯噪声的瑞利... 详细信息

估计最大多普勒频移或者是移动台的速度对于优化接收机的性能至关重要。本文主要研究了宽带码分多址通信系统中四种最大多普勒频移的估计方法并通过对WCDMA系统的理论计算和计算机仿真比较了它们在具有各向同性散射体和高斯噪声的瑞利信道中的性能差异。

关键词：宽带码分多址最大多普勒频移瑞利衰落信道

LOW-COMPLEXITY BLIND MULTIUSER DETECTION OF DS-CDMA SIGNAL IN DISPERSIVE CHANNELS

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Journal of Electronics(China) 2001年第4期18卷 330-336页

作者： Lin Zhiqiang you xiaohu Wang Yong(national mobile communications research laboratory, Southeast University, Nanjing 210096) national mobile communications research laboratory Southeast University Nanjing 210096

The problem of blind multiuser detection in dispersive channels of Code-Division Multiple-Access (CDMA) in the presence of both Multiple-Access Interference (MAI) and InterSymbol Interference (ISI) is considered. In practice, it is showed that by incorporating the desired user's signature waveform and the auxiliary vector, the information of the user can be identified using the suboptimal subspace method. The major contribution of this paper is to propose a minimum-mean-square-error detector with the suboptimal subspace-based blind technique for joint suppression of MAI and ISI in the dispersive CDMA channels.

关键词： Code-division multiple-access Multiuser detection Multiple-access interference Intersymbol interference

A survey of next generation mobile communications researchin China

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Chinese Science Bulletin 2011年第5期56卷 2875-2888页

作者： TIAN JinFeng 1,2 , ZHENG XiaoYing 2,3 , HU HongLin 1,2 you xiaohu 1,3 1 Shanghai research Center for Wireless communications (WiCO), Shanghai 200335, China 2 Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences (CAS), Shanghai 200050, China 3 national mobile communications research laboratory, Southeast University (SEU), Nanjing 210096, China Shanghai research Center for Wireless communications (WiCO) Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences (CAS) national mobile communications research laboratory Southeast University (SEU)

With the rapid development of wireless communication networks, the fourth generation (4G) has emerged to move beyond the limitations of the third generation (3G), with increased bandwidth, enhanced quality of services, and reduced costs of resources. In this paper, we discuss the key technologies of 4G and focus on surveying the ongoing research in 4G communications in China. The 4G technologies under investigation include multicarrier transmission, multiple antenna techniques, carrier aggregation, relays, cognitive radio, distributed antenna systems, network convergence, and network self-optimization. These technologies are the building blocks of 4G and contribute largely to the requirements of International mobile Telecommunications Advanced (IMT-Advanced). For each technology, its benefits, research topics, and some existing approaches are examined. Finally, we briefly discuss the challenges and future research issues in 4G systems.

关键词：下一代移动通信中国无线通信网络分布式天线系统 4G系统多载波传输国际移动通信认知无线电

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VARIABLE-RATE MULTIUSER DIVERSITY IN CORRELATED MIMO CHANNEL VIA VIRTUAL CHANNEL REPRESENTATION

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Journal of Electronics(China) 2006年第3期23卷 332-337页

作者： Tang Lan you xiaohu Liang Yingchang national mobile communications research laboratory Southeast University Nanjing 210096 China Institute for Information research Singapore 119613 Singapore

This paper studies the multiuser diversity with constellation selection based on a virtual representation of realistic Multiple Input Multiple Output (MIMO) correlated channels. To realize multiuser diversity in slow fading channels, random beamforming is adopted. Random beamforming matrix exploiting virtual channel representation is constructed, which can match the channel matrix of the desired user better. Simultaneously, adaptive coded modulation is applied to each sub-channel of the selected user to improve the system performance further.

关键词：多输入输出 MIMO 多用户检测虚拟通道自适应调制

Linear beamformer schemes with simple relay selection in MIMO relay networks

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The Journal of China Universities of Posts and Telecommunications 2008年第4期15卷 24-29+39页

作者： MENG Qing-min 1,2, PAN Su1, ZHENG Bao-yu1, ZHU Hong-bo1, you Xiao-hu2 1. Jiangsu Key laboratory of Wireless communications and Institute of Signal Processing and Transmission, nanjing university of Posts and Telecommunications, nanjing 210003, China 2. national mobile communications research Lab, Southeast University, Nanjing 210096, China Jiangsu Key laboratory of Wireless communications and Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Nanjing 210003 China national mobile communications research Lab Southeast University Nanjing 210096 China

This article considers a wireless multi-hop/mesh network where single multi-antenna source-destination pair communicates through a selected relay subset using simple relay selection under the constraint of fixed relay’s number. Compared with random selection, the simple relay selection can yield certain capacity advantages while linear zero-forcing (ZF) receiver and linear beamformer are considered at the relay. For match-filter (MF) beamformer and amplified-and-forward (AF) beamformer with a fixed number of relays, the capacities are given. Furthermore, we extend the simple selection methods to the relaying scheme with orthogonal-triangular (QR) beamformer and investigate these linear beamformer schemes over spatially correlated multi-input multi-output (MIMO) links for both the backward and forward channel over the two-hop MIMO relay networks.

关键词： wireless mesh networks multi-hop relaying capacity beamformer

Dual-turbo receiver architecture for turbo coded MIMO-OFDM systems

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Science China(Information Sciences) 2012年第2期55卷 384-395页

作者： WANG WenJin1,GAO XiQi1,WU XiaoFu2,you xiaohu1,ZHAO ChunMing1 & WONG Kai-Kit3 1national Communication research laboratory,Southeast University,Nanjing 210096,China 2nanjing Institute of communications Engineering,nanjing 210007,China 3Department of Electrical and Electronic Engineering,university College London London WC1E 7JE,UK national Communication research laboratory Southeast University Nanjing China nanjing Institute of communications Engineering Nanjing China Department of Electrical and Electronic Engineering University College London London UK

This paper presents a novel architecture of iterative receivers with two layers of iterations for turbo coded multiple-input and multiple-output orthogonal frequency-division multiplexing(MIMO-OFDM)systems,where soft messages are passed not only between the MIMO detector and the turbo decoder,but also between the two component decoders within the turbo decoder.We first derive the factor graph representation of a turbo coded system as a basic building block for developing the iterative receivers.Then,a new soft message passing schedule over the factor graph is proposed,resulting in the proposed dual-turbo receiver architecture(DTRA).In DTRA,the MIMO detector and the turbo decoder work concurrently,and the soft messages for both layers of iterations are updated instantaneously,instead of the block-based exchange of soft messages in the conventional iterative receivers.In so doing,the processing latency can be greatly reduced while low computational complexity can be achieved.

关键词： MIMO-OFDM iterative detection and decoding turbo codes

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最优信道质量预测算法的研究和实现

通信学报 2004年第5期25卷 93-100页

作者：方昕颜永庆尤肖虎东南大学移动通信国家重点实验室江苏南京210096

首先分析了基于MMSE准则的最优信道预测算法,通过数值结果分析了采样时间和多普勒频移的乘积对其性能的影响,并分析了信道估计误差对该算法的影响,介于该最优算法需要计算矩阵的逆,其复杂度太高,本文还提出了一种迭代算法对信道进行预测... 详细信息

首先分析了基于MMSE准则的最优信道预测算法,通过数值结果分析了采样时间和多普勒频移的乘积对其性能的影响,并分析了信道估计误差对该算法的影响,介于该最优算法需要计算矩阵的逆,其复杂度太高,本文还提出了一种迭代算法对信道进行预测,仿真结果表明其算法是逼近于MMSE的性能的,且复杂度也比较小。

关键词：最优预测算法衰落信道迭代算法