CAJ | 학술논문

在现有的卫星多波束联合预编码技术研究中，普遍假设卫星发射机有理想的用户信道信息；遗憾的是，由于长距离信号传播延迟，这种假设并不适合于卫星移动通信系统，特别是地球同步卫星系统。为了解决这个问题，提出了基于部分信道信息的多波束协作传输方法；利用阴影-莱斯信道模型，本文导出了闭合形式的中断容量表示，给出了基于部分信道信息的多波束联合预编码优化算法，克服了现有方法的局限性。仿真结果表明，与传统的单波束频率复用方法比较，提出的方法大大降低了系统的发射功率。
재현유적위성다파속연합예편마기술연구중，보편가설위성발사궤유이상적용호신도신식；유감적시，유우장거리신호전파연지，저충가설병불괄합우위성이동통신계통，특별시지구동보위성계통。위료해결저개문제，제출료기우부분신도신식적다파속협작전수방법；이용음영-래사신도모형，본문도출료폐합형식적중단용량표시，급출료기우부분신도신식적다파속연합예편마우화산법，극복료현유방법적국한성。방진결과표명，여전통적단파속빈솔복용방법비교，제출적방법대대강저료계통적발사공솔。
Existing work on multibeam joint precoding technique assumes the availability of perfect channel state information (CSI)at the satellite transmitter.Unfortunately,this assumption is not applicable to mobile satellite systems due to the long propaga-tion delays,especially for the geostationary earth orbit (GEO)satellite systems.In order to solve the problem,this paper presents a multibeam cooperative transmission method based on partial CSI.Employing the shadowed-Rice fading channel model,a closed form expression is derived for the outage capacity and the optimal joint precoding algorithms are proposed assuming the availability of on-ly partial CSI.Simulation results have shown substantial performance gain compared with conventional single beam based processing scheme.