From a physical layer aspect, those techniques feature high frequency and power efficiency, and are able to adapt to changing environments and services, will win in the longrun.
在物理层技术层面上，具有高频谱效率和功率效率，并能适应环境和业务变化的技术成为研究的热点。
2
Now the low frequency noise has been paid more attention in modern city. It can run with long distance and penetrate through wall into human ears.