A Power Reduction Method for Pilot Channel of LEO Satellite Based on Dynamic Compensation  

作　　者：Yong Zhang Yongning Zhuo Jian Wang Siyuan Jiang 

机构地区：[1]National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu, China [2]Chengdu Guoheng Space technology and Engineering Inc, Chengdu, China

出　　处：《China Communications》2017年第3期55-65,共11页中国通信（英文版）

基　　金：supported by the National High Technology Research and Development Program of China (863 Program) (No.2012AA01A502);the National Natural Science Foundation of China (No.61179006);the Science and Technology Support Program of Sichuan Province (No.2014GZX0004)

摘　　要：Since the lower power requirement of code division multiple access(CDMA) than that of other multiple access, the CDMA technology is suitable to be used in low earth orbit(LEO) satellite communication system whose space power is limited due to the small size of satellite. The pilot channel of CDMA technology is very important for earth mobile station(EMS) in LEO system to recover carrier and code, but the power requirement of pilot channel is very higher than that of other channels. In this paper, a power reduction method for pilot channel is proposed. By the new method, the power of pilot channel transmitted from LEO satellite is reduced to a lower level. For improving the signal to noise ratio(SNR) of pilot channel with lower power, coherent integration is employed in EMS at the pre-processing stage. Considering the high dynamic situation of LEO satellite, the long period of time for integration will deteriorate the receiving performance of EMS, therefore, a dynamic compensation module is added to carrier tracking loop against the high dynamic. Meanwhile, the transfer function of the new tracking loop and the condition for steadystate zero error are deduced. Numerical examples are provided to demonstrate effectiveness of the proposed approach.Since the lower power requirement of code division multiple access（CDMA） than that of other multiple access, the CDMA technology is suitable to be used in low earth orbit（LEO） satellite communication system whose space power is limited due to the small size of satellite. The pilot channel of CDMA technology is very important for earth mobile station（EMS） in LEO system to recover carrier and code, but the power requirement of pilot channel is very higher than that of other channels. In this paper, a power reduction method for pilot channel is proposed. By the new method, the power of pilot channel transmitted from LEO satellite is reduced to a lower level. For improving the signal to noise ratio（SNR） of pilot channel with lower power, coherent integration is employed in EMS at the pre-processing stage. Considering the high dynamic situation of LEO satellite, the long period of time for integration will deteriorate the receiving performance of EMS, therefore, a dynamic compensation module is added to carrier tracking loop against the high dynamic. Meanwhile, the transfer function of the new tracking loop and the condition for steadystate zero error are deduced. Numerical examples are provided to demonstrate effectiveness of the proposed approach.

关 键 词：low earth orbit satellite communication dynamic compensation power reduction carrier tracking 

分 类 号：TN927.2[电子电信—通信与信息系统]