CAJ | 학술논문

在多光束发射系统中，发送天线获得信道状态信息能够提高信道增益，有效克服大气湍流对星地激光通信的影响，提高系统的误码率性能。文章提出一种基于信道互易理论让发送天线获得信道状态信息的方法，然后根据信道状态信息，对发送光束进行最优选择，提高发射功率的利用率，改善信噪比，降低误码率。仿真结果表明，在发送端对发送天线进行最优选择，能够降低星地激光通信的误码率，提高通信系统的性能。
재다광속발사계통중，발송천선획득신도상태신식능구제고신도증익，유효극복대기단류대성지격광통신적영향，제고계통적오마솔성능。문장제출일충기우신도호역이론양발송천선획득신도상태신식적방법，연후근거신도상태신식，대발송광속진행최우선택，제고발사공솔적이용솔，개선신조비，강저오마솔。방진결과표명，재발송단대발송천선진행최우선택，능구강저성지격광통신적오마솔，제고통신계통적성능。
In multi-beam transmission system, trans-mitting antenna obtains channel state information to improve the channel gain, which can effectively over-come the atmospheric turbulence on satellite-ground laser communication, and enhance BER performance of the system. In this paper, transmitting antenna gets the channel state information (CSI) based on the channel reciprocity theory, and then the optimal choice for the transmission beam according to the CSI increases the transmission power efficiency, which is able to improve SNR and reduce the BER. The simulation results show that the transmitting an-tenna of optimal selection can reduce the BER of the satellite-ground laser communication, which can sig-nificantly improve the communication performance of the system.