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 r...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.展开更多
基金partially supported by the National Natural Science Foundation of China(61002017 and 61072076)the Shanghai Rising-Star Program,the Shanghai Natural Science Foundation(09ZR1430500)the Open Research Fund of the National Mobile Communications Research Laboratory,Southeast University,China
文摘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.
