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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 of Ka-band geostationary satellite communication links, an adaptive CDMA scheme is proposed as a rain-resistant countermeasure. In this scheme, a certain orthogonal sequence is reserved as the resource shared by each satellite cell when the rain attenuation occurs. Each station is assigned a set of orthogonal sequences by the central control station. The number of orthogonal sequences in each set depends on the amount of rainfall attenuation. In addition, the symbol repeat transmission technology is also used to make up for the signal energy loss caused by rain attenuation.