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J Electromagn Eng Sci > Volume 16(2); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(2):80-86.
DOI: https://doi.org/10.5515/JKIEES.2016.16.2.80   
Proposal of an Algorithm for an Efficient Forward Link Adaptive Coding and Modulation System for Satellite Communication
Joon-Gyu Ryu1, Deock-Gil Oh1, Hyun-Ho Kim2, Sung-Yong Hong2
1Department of Aerospace Research, Electronics and Telecommunications Research Institute (ETRI)
2Department of Radio Sciences & Engineering, Chungnam National University
Correspondence:  Sung-Yong Hong,Email: syhong@cnu.ac.kr
Abstract
This paper proposes the algorithm for forward link adaptive coding and modulation (ACM) and the detailed design for a satellite communication system to improve network reliability and system throughput. In the ACM scheme, the coding and modulation schemes are changed by as much as the channel can provide depending on the quality of the communication link. To implement the forward link ACM system in the Ka-band, channel prediction and modulation/coding decision methods are proposed and simulated. The parameters of the adaptive filter predictor based on the least mean square are optimized, the minimum mean square error of the channel predictor is 0.0608 when step size and the number of filter tap are 0.0001 and 4, respectively. A test-bed is set up to verify the forward link ACM system, and a test is performed using a Ka-band satellite (i.e., Communication, Ocean, and Meteorological Satellite [COMS]). This test verifies that the ACM scheme can increase the system throughput.
Key words: Adaptive Coding and Modulation, DVB-S2, Link Budget, Satellite Communication

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