Performance Analysis and Power Allocation for NOMA-Based Hybrid Satellite-Terrestrial Relay Networks With Imperfect Channel State Information
Performance Analysis and Power Allocation for NOMA-Based Hybrid Satellite-Terrestrial Relay Networks With Imperfect Channel State Information
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DOI：
10.1109/access.2019.2942167
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发表时间：
2019-09
期刊：
影响因子：
3.9
通讯作者：
S. Xie;Bangning Zhang;D. Guo;Bing Zhao
中科院分区：
文献类型：
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作者：
S. Xie;Bangning Zhang;D. Guo;Bing Zhao
本文研究了星地混合中继网络中的多用户非正交多址接入方案。该系统模型考虑了中继节点的解码转发（DF）和放大转发（AF）协议以及所有节点的信道状态信息（CSI）的不完整性。我们分析了中断性能和调查的功率分配问题，以确保用户之间的公平性。特别地，我们推导出了每个用户中断概率的闭式表达式和在高信噪比（SNR）区域的渐近表达式。基于渐近表达式，所考虑的非凸功率分配问题近似为广义线性分式规划问题。一个低复杂度的算法开发，以产生一个最佳的解决方案。仿真结果验证了理论分析的正确性。分析了信道估计误差和信道衰落参数对中断性能的影响。NOMA和正交多址接入（OMA）之间的比较，以及DF和AF协议之间的。
In this paper, we study the multiple-user non-orthogonal multiple access (NOMA) scheme in the hybrid satellite-terrestrial relay networks (HSTRN). The proposed system model takes into account both the decode-and-forward (DF) and amplify-and-forward (AF) protocols at the relay and the imperfection of channel state information (CSI) at all nodes. We analyze the outage performance and investigate the power allocation problem to ensure fairness among users. Specially, we derive the closed-form expressions and the asymptotic expressions at high signal-to-noise-ratios (SNR) region for the outage probability of each user. Based on the asymptotic expressions, the considered non-convex power allocation problem is approximated to a generalized linear fractional programming problem. A low-complexity algorithm is developed to yield an optimal solution. Simulation results demonstrate the validity of theoretical results. The impacts of the channel estimation error and channel fading parameters on the outage performance are analyzed. Comparisons between NOMA and orthogonal multiple access (OMA), as well as between DF and AF protocols are also shown.