摘要
There is a contradiction between high processing complexity and limited processing resources when turbo codes are used on the on-board processing(OBP)satellite platform.To solve this problem,this paper proposes a partial iterative decode method for on-board application,in which satellite only carries out limited number of iteration according to the on-board processing resource limitation and the throughput capacity requirements.In this method,the soft information of parity bits,which is not obtained individually in conventional turbo decoder,is encoded and forwarded along with those of information bits.To save downlink transmit power,the soft information is limited and normalized before forwarding.The iteration number and limiter parameters are optimized with the help of EXIT chart and numerical analysis,respectively.Simulation results show that the proposed method can effectively decrease the complexity of onboard processing while achieve most of the decoding gain..
There is a contradiction between high processing complexity and limited processing resources when turbo codes are used on the on-board processing(OBP)satellite platform.To solve this problem,this paper proposes a partial iterative decode method for on-board application,in which satellite only carries out limited number of iteration according to the on-board processing resource limitation and the throughput capacity requirements.In this method,the soft information of parity bits,which is not obtained individually in conventional turbo decoder,is encoded and forwarded along with those of information bits.To save downlink transmit power,the soft information is limited and normalized before forwarding.The iteration number and limiter parameters are optimized with the help of EXIT chart and numerical analysis,respectively.Simulation results show that the proposed method can effectively decrease the complexity of onboard processing while achieve most of the decoding gain..
基金
supported by National High Technology Research and Development Program(863 Program,2012AA01A502)
National Natural Science Foundation of China (41206031)
National Basic Research Program(2012CB316000)
作者简介
received B. S. degree in communicationengineering from University of Electronic Science and Technology of China, Chengdu, China, in 2009. He is currently a Ph. D. candidate at Department of Electronic Engineering, Tsinghua University, Beijing, China. His current research interests include mobile satellite communications and physical layer technology. Ema hang09@mails.tsinghua.edu.cn
GAO Zhen received the BS, MS and PhD degree in Electrical and Information Engineering from Tianjin University, China, in 2005, 2007 and 2011, respectively. During 2008.10 - 2010.11, he was a visiting scholar in GeorgiaTech, working on the design and implementation for OFDM based cooperative communication. During 2011.7 - 2014.12, he was an assistant researcher in the Wireless and Mobile Communication Research Center in Tsinghua University, China. His focus now is mobile satellite communications and fault-tolerant signal processing. ＊ The corresponding author. Email： zgao@tju.edu.cn
ZHAO Ming received a B.S. degree and a Ph.D. in communication and information systems from Tsinghua University in 1993 and 1998, respectively. He currently is associate professor at Tsinghua University, Beijing, China. His research interests include spread spectrum, channel coding and wireless networking. Emaih zhaoming@mail. tsinghua.edu.cn
WANG Jing received the B.S. and M.S. degrees in electronic engineering from Tsinghua University, Beijing, China, in 1983 and 1986, respectively. He has been on the faculty of Tsinghua University since 1986. He currently is a Professor and the Vice-Dean of the Tsinghua National Laboratory for Information Science and Technology. His research interests are in the area of wireless digital communications, including modulation, channel coding, multiuser detection, and 2D RAKE receivers. He has published more than 100 conference and journal papers. He is a member of the Technical Group of China 3G Mobile Communication R＆D Project, and he serves as an expert of communication technology in the National 863 Program. Mr. Wang is also a member of the Radio Communication Committee of Chinese Institute of Communications and a senior member of the Chinese Institute of Electronics. Email： wangj @ mail.tsinghua.edu.cn
