摘要
There have been considerable research efforts on developing the enabling technologies for the next generation of wireless communication systems all over the world, leading towards the future 5G and beyond 5G wireless systems. The key demands now are user-eentric （instead of the traditional carrier-centric） mobile applications, high mobile data traffic volume, large number of connected devices, long device/network lifetime, improved Quality of Services （QoS） and Quality of Experience （QoE） for users, i.e., high-transmission rate, low delay, and small jitter etc. In recent years, a lot of promising wireless technologies have been proposed or developed to improve the quality of wireless communications and to enable new wireless applications. Such technologies are focused on new spectrum such as millimeter wave, wider bandwidths, new modulation techniques, enhanced small cells, massive MIMO, and so on.
基金
Acknowledgments Tao Jiang＇s work is supported in part by the National Science Foundation for Distinguished Young Scholars of China with Grant number 61325004 and National Science Foundation of China with Grants 61428104 and 61631015, National High Technology Development 863 Program of China under Grants 2015AA01AT10 and 2014AAO1A704, the Key Project of Hubei Province in China with Grant 2015BAA074. Shiwen Mao＇s work is supported in part by the US National Science Foundation under grants CNS-1247955 and CNS-1320664, and by the Wireless Engineering Research and Education Center （WEREC） at Auburn University.
