论文部分内容阅读
我国的SCDMA系统最大突破是将智能天线首次应用于民用移动通信,它的优势在于把信号的能量充分集中给有通信需求的用户,并随用户移动。这种智能化的工作方式使天线发出的信号可到达更远的传输距离。再结合上行同步的CDMA同步码分多址的技术,系统就具有了目前国际上最高的频谱利用率,对用户来说,频率使用的费用就大大降低了。SCDMA系统的应用开辟了我国通信行业的新局面,在这里首先总结了SCDMA的发展历史,并对其应用与演进进行了简要的探讨。
The biggest breakthrough of SCDMA system in our country is the first application of smart antenna to civil mobile communications. Its advantage lies in fully concentrating the signal energy to users who have communication needs and moving with the users. This smart way to work makes the signal from the antenna can reach a longer transmission distance. Combined with the uplink synchronous CDMA synchronous code division multiple access technology, the system has the highest international spectrum utilization, the user, the cost of using the frequency is greatly reduced. The application of SCDMA system has opened up a new situation in China’s communications industry. Here we first summarize the development history of SCDMA and briefly discuss its application and evolution.