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A survey of next generation mobile communications researchin china

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 China shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences (CAS) Shanghai China National Mobile communications research Laboratory Southeast University (SEU) Nanjing China

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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Weight Based Channel Selection Towards 5G in the Unlicensed Spectrum

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china communications 2018年第8期15卷 54-66页

作者： Yu Zeng Ting Zhou honglin hu Yang Yang jinfeng tian Zhenhong Li shanghai Institute of Microsystem and Information Technology(SIMIT) Chinese Academy of SciencesNo.865 Changning RoadChangning DistrictShanghai 200050China University of Chinese Academy of Sciences No.19A Yuquan RoadShijingshan DistrictBeijing 100049China shanghai Advanced research Institute(SARI) Chinese Academy of SciencesNo.99 Haike RoadPudong DistrictShanghai 201210China shanghaiTech University Shanghai 201210China TCL Communication Technology Holdings Ltd.shanghai R&D center Building C5-9FNo.232Liangjing RoadZhangjiang H igh-tech ParkShanghai 201203China

The growth of the wireless and mobile communication data traffic has brought severe challenges to the present telecommunication systems. To meet the ever-increasing mobile traffic demand in the next 5 th generation(5 G) communication systems, deploying 5 G in the unlicensed spectrum(5 G-U), has been regarded as a promising technology. The Third Generation Partnership Project(3 GPP) has specified the standardization of the Licensed Assisted Access(LAA) and its extension enhanced LAA(e LAA), to opportunistically transmit in the unlicensed spectrum. The LAA/e LAA systems share unlicensed spectrum resource with other networks, e.g., the Wi-Fi systems. In this article, we analyze the coexistence between the e LAA and the Wi-Fi systems in the unlicensed spectrum. We firstly establish the system model where the e LAA coexists with the Wi-Fi systems. Then, we theoretically derive and figure out the unfairness in the multi-channel occupancy rate between the e LAA and the Wi-Fi systems. After that, we propose a weight based channel selection method to improve the fairness of the coexistence. The numerical results demonstrate that by avoiding contentions and declining collisions, our method not only enhances the fairness, but also improves the overall unlicensed spectrum usage rate.

关键词：光谱分析重量隧道 Wi-Fi 通讯系统通讯数据标准化共存

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CYCLOSTATIONARITY-BASED OFDM SIGNAL SENSING OVER DOUBLY-SELECTIVE FADING CHANNELS

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Journal of Electronics(china) 2011年第1期28卷 1-7页

作者： tian jinfeng Jiang Yonglei Chen huaxia hu honglin Key Laboratory of wireless Sensor Network ＆ communications SIMIT Chinese Academy of Science Shanghai 200335 China shanghai research center for wireless communications Shanghai 200335 China

In this paper,using cyclostationarity-based sensing method to detect the presence of Orthogonal Frequency Division Multiplexing(OFDM) signal over doubly-selective fading channels is studied.By approximating the channel with Basis Expansion Model(BEM),we derive the second-order cyclostationary statistics of the received OFDM signal over doubly-selective fading channels.Theoretical analysis indicates that new cyclostationary signatures produced by Doppler spread and multipath delay can be further exploited in the detecting process.Simulation examples demonstrate that the sensing methods using channel-induced cyclostationary features provide substantial improvements on detection performance.

关键词： Signal sensing Cyclostationarity Orthogonal Frequency Division Multiplexing(OFDM) Doubly-selective fading

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