1. He, Y., et al.: 5G-oriented non-orthogonal multiple access technology. Int. J. Commun. Syst. 49(5), 115–120 (2020)
2. He, Y., Duan, Z.: Bidirectional soft information relaying scheme via spatial coupling LDPC coding. J. Harbin Inst. Technol. 49(5), 62–67 (2017)
3. Liu, L.: Space-Ground Integrated Network, 1st edn. Science Press, Peking (2015)
4. Min, S., Liu, G., Chen, B., Liu, J.: Space-Ground Integrated Information Network.1st edn. Electronic Industry Press, Peking (2020)
5. Sundararajan, J.K., Shah, D., Mdard, M.: ARQ for network coding. In: IEEE International Symposium on information Theory, pp. 1651–1655 (2008)