TD-SCDMA标准缺陷研究  

The Research about the Defects of TD-SCDMA Standards

作　　者：傅海阳[1] 陆素花[1] 沈晖[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2006年第1期36-41,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

摘　　要：从智能天线的工作原理出发说明使用智能天线时很难实现小区的分扇区应用、多频点天线公用,因此可以证明智能天线还不是一项可供商用的实用技术;考虑相邻小区/扇区时隙的不对称分配所产生的相邻小区/扇区收发干扰时,可以证明上、下行时隙实质上是不能按需分配的。3 G使用的频段是2 GHz,具有传播衰落大、穿透能力差、不易做大范围覆盖。TD-SCDMA标准很难提供3G标准所规定的在车载、步行、静止环境下分别达到144 kb it/s、384 kb it/s和2 048 kb it/s的无线接入速率要求。It is presented in the paper that it is difficult to realize the sectored cell and the same antenna for multiple frequency channels by analyzing the theory of the smart antenna. Therefore it can be proved that the smart antenna technology is not a commercial technology at present. Asymmetry slot distribution between inter-cells/sectors would bring the transmission and receiving interference between the inter-cells/sectors, so it cant be put into practical application. The technological defects of the TD-SCDMA standard are analyzed in the paper from many aspects, such as the characteristics of 2 GHz frequency band, MS＇s transmission power, a cell capacity on uplink/ downlink and so on. TD-SCDMA system is difficult to support different radio access data rates, such as vehicular environment： 144 kbit/s, pedestrian environment： 384 kbit/s, indoor office environment： 2. 048 Mbit/s, which are required by 3G standards.

关 键 词：3G移动通信 智能天线 小区容量 上下行链路预算 

分 类 号：TN929.5[电子电信—通信与信息系统]