Energy Efficient Adaptive Transmissions in Integrated Satellite-Terrestrial Networks With SER Constraints
Energy Efficient Adaptive Transmissions in Integrated Satellite-Terrestrial Networks With SER Constraints
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DOI：
10.1109/twc.2017.2764472
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发表时间：
2018
影响因子：
10.4
通讯作者：
Y. Ruan;Yongzhao Li;Chengxiang Wang;Rui Zhang
中科院分区：
文献类型：
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作者：
Y. Ruan;Yongzhao Li;Chengxiang Wang;Rui Zhang
卫星-地面综合网络允许卫星和地面网络之间的频率重用，可以在空间上优化稀缺频谱资源的使用，从而成为未来多媒体业务最有前途的基础设施之一。考虑到卫星通信对效率和可靠性的要求，本文提出了一种综合网络的自适应传输方案，该方案中卫星与目标用户的通信既可以采用直接方式，也可以采用协作方式。具体而言，我们首先研究了在复合多径/阴影衰落下，两种共信道干扰传输模式的符号误码率（SER）性能。以导出的SERs为约束，将自适应传输方案表述为以能效（EE）最大化为目标的优化问题，并讨论了能效、频谱效率（SE）和SER之间的权衡。此外，还分析了经济效率作为经济效益和能效的补充绩效指标。仿真结果表明，该方案可以提高卫星通信的可达EE，这表明我们应该根据不同的干扰场景和阴影程度自适应地选择传输模式，而不是咄咄逼人地采用协同传输。
Allowing frequency reuse between satellite and terrestrial networks, the integrated satellite-terrestrial network can spatially optimize the usage of scarce spectrum resource and is thus becoming one of the most promising infrastructures for future multimedia services. Taking the requirements of both efficiency and reliability in satellite communications into account, we propose an adaptive transmission scheme for the integrated network in this paper, where the satellite can communicate with the destination user either in direct mode or in cooperative mode. Specifically, we first investigate the symbol error rate (SER) performance of two transmission modes with co-channel interference under composite multipath/shadowing fading. Taking the derived SERs as constraints, we formulate the adaptive transmission scheme as an optimization problem with the objective of maximizing energy efficiency (EE) and discuss the trade-off among EE, spectral efficiency (SE), and SER. Furthermore, economic efficiency is also analyzed as a complementary performance measure to SE and EE. Simulation results show that the proposed scheme can increase the attainable EE of satellite communications, which indicates that we should choose the transmission mode adaptively according to different interfering scenarios and shadowing degrees, rather than adopting cooperative transmission aggressively.