CodePudding user response:
According to the current consensus, 5 g system should have the features: the capacity of the 4 g (LTE - A) increased by more than 1000 times, spectrum efficiency and the energy consumption and transmission delay, system security and user experience significantly increased, at the same time 5 g for machine to machine (M2M) communications and Internet provide architectural support application scenarios, 5 g research several hot topics: large-scale Massive (MIMO) antenna array Multicarrier technology based on the filter group (Filterbank Multicarrier, FBMC), full duplex multiplexing, super dense network, self-organization network, software defined network and content delivery network, theory problem is the problem, the hardware is not the bottleneck of 5 g) first, large-scale MIMO research difficulties in where? (1) channel modeling, (2) the ratio of multiple access scheme, (3) channel estimation and pilot, (4) receiver, second, filter bank based multicarrier research.Specific can see: https://www.zhihu.com/question/27119413/answer/47471681