Millimeter-wave(mm Wave) communications will be used in fifth-generation(5G) mobile communication systems, but they experience severe path loss and have high sensitivity to physical objects, leading to smaller cell ra...Millimeter-wave(mm Wave) communications will be used in fifth-generation(5G) mobile communication systems, but they experience severe path loss and have high sensitivity to physical objects, leading to smaller cell radii and complicated network architectures. A coverage extension scheme using large-scale antenna arrays(LSAAs) has been suggested and theoretically proven to be cost-efficient in combination with ultradense small cell networks. To analyze and optimize the LSAA-based network deployments, a comprehensive survey of recent advances in statistical mmWave channel modeling is first presented in terms of channel parameter estimation, large-scale path loss models, and small-scale cluster models. Next, the measurement and modeling results at two 5G candidate mmWave bands(e.g., 28 GHz and 39 GHz) are reviewed and compared in several outdoor scenarios of interest, where the propagation characteristics make crucial contributions to wireless network designs. Finally, the coverage behaviors of systems employing a large number of antenna arrays are discussed, as well as some implications on future mmWave cellular network designs.展开更多
Rapid growth in mobile computing and other wireless multimedia services isinspiring many research and development activities on high-speed wireless communication systems.Main challenges in this area include the develo...Rapid growth in mobile computing and other wireless multimedia services isinspiring many research and development activities on high-speed wireless communication systems.Main challenges in this area include the development of efficient coding and modulation signalprocessing techniques for improving the quality and spectral efficiency of wireless systems. Therecently emerged space-time coding and signal processing techniques for wireless communicationsystems employing multiple transmit and receive antennas offer a powerful paradigm for meeting thesechallenges. This paper provides an overview on the recent development in space-time coding andsignal processing techniques for multiple-input multiple-output (MIMO) communication systems. Wefirst review the information theoretic results on the capacities of wireless systems employingmultiple transmit and receive antennas. We then describe two representative categories of space-timesystems, namely, the BLAST system and the space-time block coding system, both of which have beenproposed for next-generation high-speed wireless system. Signal processing techniques for channelestimation and decoding in space-time systems are also discussed. Finally, some other coding andsignal processing techniques for wireless systems employing multiple transmit and receive antennasthat are currently under intensive research are also briefly touched upon.展开更多
信道建模是设计无线通信系统的基础,为设计智慧交通系统,必须对车联网(vehicle to everything,V2X)信道进行深入研究.文中首先总结了V2X标准化信道的特点,讨论了天线设置、非平稳特性以及毫米波对V2X信道的影响;然后对车与车(vehicle to...信道建模是设计无线通信系统的基础,为设计智慧交通系统,必须对车联网(vehicle to everything,V2X)信道进行深入研究.文中首先总结了V2X标准化信道的特点,讨论了天线设置、非平稳特性以及毫米波对V2X信道的影响;然后对车与车(vehicle to vehicle,V2V)信道参数进行了描述,并分析了V2V信道三种建模方式的优缺点;最后提出将来需要做的工作.展开更多
基金supported in part by the National Natural Science Foundation of China under Grant No.61671145the Key R&D Program of Jiangsu Province of China under Grant BE2018121
文摘Millimeter-wave(mm Wave) communications will be used in fifth-generation(5G) mobile communication systems, but they experience severe path loss and have high sensitivity to physical objects, leading to smaller cell radii and complicated network architectures. A coverage extension scheme using large-scale antenna arrays(LSAAs) has been suggested and theoretically proven to be cost-efficient in combination with ultradense small cell networks. To analyze and optimize the LSAA-based network deployments, a comprehensive survey of recent advances in statistical mmWave channel modeling is first presented in terms of channel parameter estimation, large-scale path loss models, and small-scale cluster models. Next, the measurement and modeling results at two 5G candidate mmWave bands(e.g., 28 GHz and 39 GHz) are reviewed and compared in several outdoor scenarios of interest, where the propagation characteristics make crucial contributions to wireless network designs. Finally, the coverage behaviors of systems employing a large number of antenna arrays are discussed, as well as some implications on future mmWave cellular network designs.
文摘Rapid growth in mobile computing and other wireless multimedia services isinspiring many research and development activities on high-speed wireless communication systems.Main challenges in this area include the development of efficient coding and modulation signalprocessing techniques for improving the quality and spectral efficiency of wireless systems. Therecently emerged space-time coding and signal processing techniques for wireless communicationsystems employing multiple transmit and receive antennas offer a powerful paradigm for meeting thesechallenges. This paper provides an overview on the recent development in space-time coding andsignal processing techniques for multiple-input multiple-output (MIMO) communication systems. Wefirst review the information theoretic results on the capacities of wireless systems employingmultiple transmit and receive antennas. We then describe two representative categories of space-timesystems, namely, the BLAST system and the space-time block coding system, both of which have beenproposed for next-generation high-speed wireless system. Signal processing techniques for channelestimation and decoding in space-time systems are also discussed. Finally, some other coding andsignal processing techniques for wireless systems employing multiple transmit and receive antennasthat are currently under intensive research are also briefly touched upon.
文摘信道建模是设计无线通信系统的基础,为设计智慧交通系统,必须对车联网(vehicle to everything,V2X)信道进行深入研究.文中首先总结了V2X标准化信道的特点,讨论了天线设置、非平稳特性以及毫米波对V2X信道的影响;然后对车与车(vehicle to vehicle,V2V)信道参数进行了描述,并分析了V2V信道三种建模方式的优缺点;最后提出将来需要做的工作.
