一种作为抗雨衰对策的自适应CDMA方案

Adaptive CDMA Scheme as Rain Fade Countermeasures

为提高 Ka-波段静止同步卫星通信链路的可用度 ,提出了一种自适应 CDMA方案作为抗雨衰对策。在此方案中 ,预留一定的正交序列作为雨衰发生时各个卫星小站共享的资源。由中心控制站给每个小站分配一组正交序列 ,每组中正交序列的个数取决于发生降雨衰减的量。另外 ,码元重复传输技术也用来弥补雨衰引起的信号能量损耗。

In order to improve the availability at Ka-band geosynchronous satellite communication links,an adaptive CDMA scheme as a rain fade countermeasure is proposed This scheme reserves and shares orthogonal sequences during the rain fade The master station allocates a set of orthogonal sequences to each remote terminal station, and the number of sequences in a set is depended on the amount of rain attention In addition, symbol repetition technique in also used to compensate signal energy loss resulted from the rain fade