面向5G的Massive MIMO技术应用场景研究

With the development of mobile communication technology, the 5th generation mobile communication (5G) networks have been officially in use and built in a large scale. As an key technology of 5G, Massive MIMO technology has the advantage of large system capacity, wide coverage and strong anti-interference capability. On the basis of introducing Massive MIMO technology and beam forming, this paper analyzes the equipment configuration of Massive MIMO. Equipment cost, user value, terminal distri- bution and brand reputation are combined to construct tridimensional and hierarchical network through sub-scene deployment and utilizing different equipment configuration. Finally, a method to build low-cost and high-quality 5G communication network is pro- posed.     

G.655光缆中继段光纤链路PMD值测试研究

通过实用G.655光缆工程大量测试、对比验证：WS（波长扫描）法可作为ITU建议的PMD（偏振模色散）基准测量方法-IF（干涉）法的替代法;性能稳定,合格的G.655光缆敷设后PMD值影响很小;纤段串接后链路的PMD值可用文中引用的公式（1）计算,而等长纤段串接后PMD值可用简化的公式（2）计算,且由它推出当各段PMD值相等或接近时,它就是串接后光纤链路的值,此公式也适用G.652和G.655纤段串接后链路PMD值的计算,G.655纤链的PMD值不会因G.652纤段的接入而受影响和劣化。