作　　者： ; ; ; ;

机构地区： 西安电子科技大学通信工程学院

出　　处： 《西安电子科技大学学报》 2005年第2期268-271,共4页

摘　　要： 为了提高移动通信系统的容量,同时考虑到未来GSM与CDMA系统将长期并存的因素,提出了两种系统共享频段的方法.在发送端,通过扩频码对GSM信号进行直接序列扩频,使其多址方式由TDMA变换为CDMA/TDMA,然后与CDMA信号在空间同频传输,这样就可以解决两个系统在Um接口的兼容问题;在接收端,使用相同的扩频码对CDMA/TDMA信号进行解扩,使其多址方式由CDMA/TDMA还原为TDMA,由此可以将GSM与CDMA两种信号进行分离.理论分析和仿真结果表明,该方法可使系统总容量扩大两倍. To increase the capacity of the mobile communication system and consider the concurrence of CDMA and GSM systems for a long term, we put forward the scheme that the two systems share a common radio-band. First, at the transmitter, GSM signals will be multiplied by PN sequences to be transferred from the TDMA mode to the CDMA/TDMA mode. Then they will transmit with CDMA signals on the same bandwidths, so the Um interface combination problem of these two systems can be solved. At the receiver, CDMA/TDMA signals will be multiplied by the same PN sequences to be transferred to the TDMA mode, the these two signals can be separated. It can be seen from theoretical analysis and simulation resuls that this method can double the total system capacity.

关 键 词： 同频共事 系统容量

领　　域： [电子电信] [电子电信]