Satellite-borne laser communication method

The invention discloses a satellite-borne laser communication method. The satellite-borne laser communication method comprises the following steps that: a space-time encoder performs space-time block coding on a plurality of laser sending information sequences; a channel estimator estimates channel amplitude and phase characteristics; and a combiner performs maximum-ratio combination on the received signals according to space-time block codes to obtain N*M combination gain, so that the same combination gain of a transmitting N*M receiving coherent laser communication system is realized under the condition of reducing the size and the weight of a load carried by a single satellite, and a coherent communication system is reserved. 本发明公开了一种星载激光通信方法，包括：空时编码器对多个激光器发送信息序列进行空时分组编码；信道估计器估计出信道振幅和相位特征；合并器按照空时分组码对接收信号进行最大比合并，得到N×M合并增益，以在降低单个卫星携带载荷的尺寸和重量的情况下实现一发N×M收相干激光通信系统同样的合并增益，且保留相干通信体制。