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VCM-OFDM technique for advanced space communications system with high spectral efficiency
Li, Jionghui; Zhou, Qing; Xiong, Weiming; Zhang, Ying; Yao, Chen; Li, Jionghui (jionghui@nssc.ac.cn)
Department空间技术部
Source PublicationActa Astronautica
2016
Volume128Pages:385-391
ISSN0094-5765
Language英语
AbstractThe development of precise scientific payloads brings higher demand on the efficiency of space communications system to transmit the increasing volume of scientific data. Aiming to this issue, Orthogonal Frequency Division Multiplexing (OFDM) is chosen for its inherent capability of high-rate data transmission. Further, considering the dynamic link condition due to satellite orbital motion, we propose a new technique which combines Variable Coding Modulation (VCM) with OFDM to enhance the communication link spectral efficiency with required transmission reliability. With VCM-OFDM technique, the channel coding and modulation mode can be variable with time according to the link conditions, in order to fit the link budget curve and maintain a relatively fixed link margin. Hence, link resource waste can be reduced and throughput can be remarkably improved. Considering that OFDM-based systems are sensitive to Doppler shifts/spread, the coding and modulation mode (CODMOD) selection should be optimized subject to this scenario. This paper introduces the architecture of near-earth space data transmission system based on VCM-OFDM technique. The Doppler influence is analyzed through simulation and the CODMOD selection algorithm is discussed. The results prove the high performance on spectral efficiency enhancement of VCM-OFDM by comparison with several existing alternative methods. © 2016
Indexed BySCI ; EI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5586
Collection空间技术部
Corresponding AuthorLi, Jionghui (jionghui@nssc.ac.cn)
Recommended Citation
GB/T 7714
Li, Jionghui,Zhou, Qing,Xiong, Weiming,et al. VCM-OFDM technique for advanced space communications system with high spectral efficiency[J]. Acta Astronautica,2016,128:385-391.
APA Li, Jionghui,Zhou, Qing,Xiong, Weiming,Zhang, Ying,Yao, Chen,&Li, Jionghui .(2016).VCM-OFDM technique for advanced space communications system with high spectral efficiency.Acta Astronautica,128,385-391.
MLA Li, Jionghui,et al."VCM-OFDM technique for advanced space communications system with high spectral efficiency".Acta Astronautica 128(2016):385-391.
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