无线电工程
無線電工程
무선전공정
RADIO ENGINEERING OF CHINA
2014年
4期
62-66
,共5页
低轨卫星%Loo模型%Rake接收%FC-LMS算法
低軌衛星%Loo模型%Rake接收%FC-LMS算法
저궤위성%Loo모형%Rake접수%FC-LMS산법
LEO satellite%Loo model%Rake receiver%FC-LMS algorithm
在低轨卫星CDMA移动通信系统中,信关站的上空会同时存在至少2颗卫星。针对这一特点,综合考虑低轨卫星通信信道的特性,研究分析了在信关站端采用的多星分集和Rake接收技术,提出了一种基于快速收敛LMS算法( FC-LMS)的多径合并方案,实现对信道变化的实时跟踪。仿真结果表明,在信关站端采用多星发送分集方案与Rake接收技术,可以有效降低系统误码率,改善系统性能。
在低軌衛星CDMA移動通信繫統中,信關站的上空會同時存在至少2顆衛星。針對這一特點,綜閤攷慮低軌衛星通信信道的特性,研究分析瞭在信關站耑採用的多星分集和Rake接收技術,提齣瞭一種基于快速收斂LMS算法( FC-LMS)的多徑閤併方案,實現對信道變化的實時跟蹤。倣真結果錶明,在信關站耑採用多星髮送分集方案與Rake接收技術,可以有效降低繫統誤碼率,改善繫統性能。
재저궤위성CDMA이동통신계통중,신관참적상공회동시존재지소2과위성。침대저일특점,종합고필저궤위성통신신도적특성,연구분석료재신관참단채용적다성분집화Rake접수기술,제출료일충기우쾌속수렴LMS산법( FC-LMS)적다경합병방안,실현대신도변화적실시근종。방진결과표명,재신관참단채용다성발송분집방안여Rake접수기술,가이유효강저계통오마솔,개선계통성능。
In LEO satellite mobile communication system of CDMA,there are at least two satellites over the gateway station simul-taneously.According to this feature,Rake receiver is studied by considering the channel characteristics of LEO satellite communication systems.In order to track in real time the change of the channel,a multipath combining scheme based on fast convergence LMS algorithm (FC-LMS) is proposed.The simulation results show that the multi-satellite transmits diversity and Rake receiver can be used to reduce the BER and improve the performance of system.