System Link Analysis for a Hybrid SATCOM System with Various Terminal Types
Liao ,Chien-Hsing
National Central University, Department of Communication Engineering
Woo,Tai-Kuo
National Defense Management College,Department of Information Management
Tsay,Mu-King
National Central University, Department of Communication Engineering
Cheng,Kuang-Zeng
National Space Organization
Tactical SATCOM communications employing spread spectrum techniques have been widely investigated for the past several decades. It is typical that an advanced hybrid direct-sequence code-division multiple access (DS-CDMA) system has various remote terminals and must coexist with a conventional frequency-division multiple access (FDMA) system. In this paper, the system link design issues for such hybrid system are investigated. We first investigate a pure and hybrid DS-CDMA satellite communication system under the constraints of specific payload power limitations, mutual interference, and then for the case of different types of ground based terminals with specific applications. Schemes of “balanced” inbound and outbound channel numbers for simplex or duplex applications are available. Furthermore, the similar link analysis and results for such hybrid systems with conventional FDMA terminals are also examined. It is concluded that two power ratio schemes of fixed available Eb/No margins or fixed desired channels are available for same receiving performance or symmetric I/B and O/B channel number application purposes.
Chien-Hsing Liao received his M.S. degree in Telecommunication Engineering from National Chiao-Tung University (NCTU, Taiwan) in 1991. He is now a Ph.D. student in the Department of Communication Engineering of National Central University (NCU). He is also a senior SATCOM communications engineer in Chung- Shan Institute of Science and Technology (CSIST), Taiwan. His current research interests are in the area of secure wireless and satellite communications systems.
Mu-King Tsay received his B.S. degree from National Cheng-Kung University (NCKU, Taiwan) in 1969 and his M.S. degree from National Central University (NCU, Taiwan) in 1972, respectively. He had been a visiting expert for two years in the field of remote sensing at NOAA, Boulder, CO, since 1979. He had also been an associate professor and a professor in the Institute of Computer Science and Electrical Engineering and the Institute of Electrical Engineering of NCU, respectively, since 1981 to 2003. He is now a professor in the Department of Communication Engineering of NCU since 2003. His current research interests include communications systems, remote sensing, data compression, signal processing and pattern recognition.