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| 1 | An overview of transmission theory and techniques of large-scale antenna systems for 5G wireless communications显示文摘To meet the future demand for huge traffic volume of wireless data service, the research on the fifth generation(5G) mobile communication systems has been undertaken in recent years. It is expected that the spectral and energy efficiencies in 5G mobile communication systems should be ten-fold higher than the ones in the fourth generation(4G) mobile communication systems. Therefore, it is important to further exploit the potential of spatial multiplexing of multiple antennas. In the last twenty years, multiple-input multiple-output(MIMO) antenna techniques have been considered as the key techniques to increase the capacity of wireless communication systems. When a large-scale antenna array(which is also called massive MIMO) is equipped in a base-station, or a large number of distributed antennas(which is also called large-scale distributed MIMO)are deployed, the spectral and energy efficiencies can be further improved by using spatial domain multiple access. This paper provides an overview of massive MIMO and large-scale distributed MIMO systems, including spectral efficiency analysis, channel state information(CSI) acquisition, wireless transmission technology, and resource allocation. | Dongming WANG Yu ZHANG Hao WEI Xiaohu YOU Xiqi GAO Jiangzhou WANG | 2016 | Science China(Information Sciences)2016，59，8： | 21 |
| 2 | Cross-layer packet scheduling for downlink multiuser OFDM systems显示文摘This paper proposes a channel and queue aware fair (CQAF) packet scheduling scheme for the downlink packet transmission in multiuser orthogonal frequency division multiplexing (OFDM) systems. By making use of the information on the channel conditions and the queue lengths, the proposed CQAF packet scheduling scheme efficiently allocates the subcarriers, transmission power and modulation level to users under the constraints of total transmission power, the number of subcarriers, bit-error-rate (BER) requirement and generalized processor sharing (GPS)-based fairness requirement. The numerical results show that the proposed CQAF packet scheduling scheme can reduce the transmission delay and queue length significantly while maximizing system throughput and maintaining fairness among users. | WANG JunBo CHEN HuaMin CHEN Ming WANG JiangZhou | 2009 | Science in China(Series F)2009，52，12： | 6 |
| 3 | Impact of RF mismatches on the performance of massive MIMO systems with ZF precoding显示文摘Thanks to the channel reciprocity, the time division duplex(TDD) operation is more preferred in massive multiple-input multiple-output(MIMO) systems. Avoiding the heavy feedback of downlink channel state information(CSI) from the user equipment(UE) to the base station(BS), the uplink CSI can be exploited for the downlink precoding. However, due to the mismatches of the radio frequency(RF) circuits at both sides of the link, the whole communication channels are usually not symmetric in practical systems. This paper is focused on the RF mismatches at the UEs and the BS for the multi-user massive MIMO systems with zero forcing(ZF) precoding. The closed-form expressions of the ergodic sum-rates are derived for evaluating the impact of RF mismatches on the system performance. Theoretical analysis and simulation results show that the RF mismatches at the UEs only lead to a negligible performance loss. However, it is imperative to perform reciprocity calibration at the BS, because the RF mismatches at the BS contribute to the inter-user interference(IUI) and result in a severe system performance degradation. | Hao WEI Dongming WANG Jiangzhou WANG Xiaohu YOU | 2016 | Science China(Information Sciences)2016，59，2： | 5 |
| 4 | Machine-learning-based high-resolution DOA measurement and robust directional modulation for hybrid analog-digital massive MIMO transceiver显示文摘At hybrid analog-digital(HAD)transceiver,an improved HAD estimation of signal parameters via rotational invariance techniques(ESPRIT),called I-HAD-ESPRIT,is proposed to measure the direction of arrival(DOA)of a desired user,where the phase ambiguity due to HAD structure is dealt with successfully.Subsequently,a machine-learning(ML)framework is proposed to improve the precision of measuring DOA.Meanwhile,we find that the probability density function(PDF)of DOA measurement error(DOAME)can be approximated as a Gaussian distribution by the histogram method in ML.Then,a slightly large training data set(TDS)and a relatively small real-time set(RTS)of DOA are formed to predict the mean and variance of DOA/DOAME in the training stage and real-time stage,respectively.To improve the precisions of DOA/DOAME,three weight combiners are proposed to combine the-maximum-likelihood-learning outputs of TDS and RTS.Using the mean and variance of DOA/DOAME,their PDFs can be given directly,and we propose a robust beamformer for directional modulation(DM)transmitter with HAD by fully exploiting the PDF of DOA/DOAME,especially a robust analog beamformer on RF chain.Simulation results show that:(1)the proposed I-HAD-ESPRIT can achieve the HAD Cramer-Rao lower bound(CRLB);(2)the proposed ML framework performs much better than the corresponding real-time one without training stage;(3)the proposed robust DM transmitter can perform better than the corresponding non-robust ones in terms of secrecy rate. | Zhihong ZHUANG Ling XU Jiayu LI Jinsong HU Linlin SUN Feng SHU Jiangzhou WANG | 2020 | Science China(Information Sciences)2020，63，8： | 5 |
| 5 | Full-spectrum cell-free RAN for 6G systems:system design and experimental results显示文摘With distributed transceivers and scalable cooperative transmission,cell-free massive multipleinput multiple-output(CF-mMIMO)technology eliminates the“cells”of traditional mobile communications,thereby significantly improving the performance of wireless networks.CF-mMIMO is considered as a major technical tool for achieving the key performance indicators of sixth generation(6G)mobile communication systems.In this paper,a scalable implementation architecture for CF-mMIMO is proposed,based on which potential key technologies such as channel information acquisition,transceiver design,dynamic user and access point association,and novel duplexing are introduced.Finally,based on low-cost commercial access points,a CF-mMIMO testbed with 64 transmit and receive antennas is developed,and the performance of the distributed receiver design is evaluated. | Dongming WANG Xiaohu YOU Yongming HUANG Wei XU Jiamin LI Pengcheng ZHU Yanxiang JIANG Yang CAO Xinjiang XIA Ziyang ZHANG Qingji JIANG Pan WANG Dongjie LIU Kang ZHENG Mengting LOU Jing JIN Qixing WANG Jiangzhou WANG | 2023 | Science China(Information Sciences)2023，66，3： | 3 |
| 6 | 意图抽象与知识联合驱动的6G内生智能网络架构显示文摘6G将以智能网络为演进形式,具备内生智能、开放性的特征。智能网络标准化研究中强调了意图驱动网络对实现网络智能化的必要性。但目前基于意图的网络将意图理解为“What to do”而非“What you want”,利用知识定义网络(KDN)可在一定程度上根据“What to do”完成“How to configure the network”。基于此,提出了意图抽象与知识联合驱动的6G内生智能网络架构,旨在根据“What you want”实现“How to configure the network”。首先,设计了意图抽象模块,通过意图获取、意图转译、意图映射和意图建模,从“What you want”获取“What to do”。其次,提出了认知模块,利用机器学习和逻辑推理联合动态优化获取网络知识,从而根据“What to do”完成“How to configure the network”。最后,介绍了支撑6G内生智能实现的意图映射、网络信息测量、网络策略生成、网络策略验证等关键技术及未来挑战。 | 杨静雅 唐晓刚 周一青 刘玲 Jiangzhou Wang | 2023 | 通信学报2023，44，2： | 2 |
| 7 | Fast ambiguous DOA elimination method of DOA measurement for hybrid massive MIMO receiver显示文摘Dear editor,Direction of arrival(DOA)estimation has been widely used in many applications,including wireless communications,radar,navigation,sonar,tracking of various objects,secure and precise wireless transmission(SPWT). | Baihua SHI Xinyi JIANG Nuo CHEN Yin TENG Jinhui LU Feng SHU Jun ZOU Jun LI Jiangzhou WANG | 2022 | Science China(Information Sciences)2022，65，5： | 2 |
| 8 | TDD reciprocity calibration for multi-user massive MIMO systems with iterative coordinate descent显示文摘For massive multiple-input multiple-output(MIMO) antenna systems, time division duplexing(TDD) is preferred since the downlink precoding matrix can be obtained through the uplink channel estimation,thanks to the channel reciprocity. However, the mismatches of the transceiver radio frequency(RF) circuits at both sides of the link make the whole communication channel non-symmetric. This paper extends the total least square(TLS) method to the case of self-calibration, where only the antennas of the access points(APs) are involved to exchange the calibration signals with each other and the feedback from the user equipments(UEs)is not required. Then, the proof of the equivalence between the TLS method and the least square(LS) method is presented. Furthermore, to avoid the eigenvalue decomposition required by these two methods to obtain the calibration coefficients, a novel algorithm named as iterative coordinate descent(ICD) method is proposed.Theoretical analysis and simulation results show that the ICD method significantly reduces the complexity and achieves almost the same performance of the LS method. | Hao WEI Dongming WANG Jiangzhou WANG Xiaohu YOU | 2016 | Science China(Information Sciences)2016，59，10： | 2 |
| 9 | Performance of wideband CDMA systems with complex spreading and imperfect channel estimation 显示文摘 | WANG Jiangzhou CHEN Jun | 2001 | IEEE Journal on Selected Areas in Communications2001，19，1： | 1 |
| 10 | Performance of wideband CDMA system withcomplex spreading and imperfect channel estimation 显示文摘 | Wang Jiangzhou | 2001 | IEEE Journal on selected areas in communications2001，19，1： | 1 |
| 11 | Performance comparison of optimum and MMSE receivers with imperfect channel estimation for VSF-OFDM systems显示文摘 | XiaBin Wang Jiangzhou Sawahashi M | 2005 | Wireless Communications2005，，6： | 1 |
| 12 | Performance of a diesel locomotive waste-heat-powered adsorption air conditioning system显示文摘 | LU Y Z WANG R Z JIANGZHOU S | 2004 | Adsorption2004，10，1： | 1 |
| 13 | Performance of Wideband CDMA Systems with Complex Spreading and Imperfect Channel Estimation显示文摘 | WANG Jiangzhou CHEN Jun | 2001 | IEEE Journal on Selected Areas in Communica- tions2001，19，1： | 1 |
| 14 | A Novel Receiver for FHMA Systems 显示文摘 | Chen Jiang Jiangzhou Wang Senior Member | 2002 | IEEE2002，53，： | 1 |
| 15 | CDMA overlay situations for microcellular mobile communications显示文摘 | WANG Jiangzhou MILSTEIN L B | 1995 | IEEE Trans Commun1995，43，24： | 1 |
| 16 | Performance com-parison of optimum and MMSE receivers with imperfect chan-nel estimation for VSF-OFCDM systems 显示文摘 | Xia Bin Wang Jiangzhou Sawahashi M | 2005 | IEEE Transac-tions on Wireless Communications?2005，4，6： | 1 |
| 17 | Performance of Wideband CDMA Systems with Complex Spreading and Imperfect Channel Estimation显示文摘 | Wang Jiangzhou Chcn Jun | 2001 | IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS2001，19，1： | 1 |
| 18 | Performance of a diesel locomotive waste-heat-powered adsorption air conditioning system显示文摘 | LU Y Z WANG R Z JIANGZHOU S | 2004 | Adsorption2004，10，： | 1 |
| 19 | Downlink transmission of broadband OFCDM systems--part I: Hybrid detection 显示文摘 | Zhou Yiqing Wang Jiangzhou Sawahashi M | 2005 | IEEE Trans on Communications2005，53，4： | 1 |
| 20 | Chunk-based resource allocation in OFDMA systems--Part I: Chunk allocation 显示文摘 | Zhu Hulling Wang Jiangzhou | 2009 | IEEETranson Communications2009，57，9： | 1 |
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