Outage Analysis and Power Allocation in Uplink Non-Orthogonal Multiple Access Systems
Outage Analysis and Power Allocation in Uplink Non-Orthogonal Multiple Access Systems
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DOI：
10.1109/lcomm.2017.2769088
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发表时间：
2018-02
期刊：
影响因子：
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通讯作者：
Ye Liu;Mahsa Derakhshani;S. Lambotharan
中科院分区：
文献类型：
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作者：
Ye Liu;Mahsa Derakhshani;S. Lambotharan
我们提出了一个易于处理的表达式在单小区上行链路非正交多址（NOMA）系统服务于任意数量的用户中断概率。该表达式通过使用移位伽马分布随机变量来近似用户间干扰而获得。然后，我们制定并提出了一个有效的NOMA系统的停电约束的最小最大功率分配问题的迭代算法。为了给出严格的比较，我们解决了中断约束的最小-最大功率分配问题的正交多址接入（OMA）对应的用户功率分配和无线电资源划分模式进行了优化。仿真结果证实了NOMA系统中断概率表达式的准确性。此外，我们证明了用户之间的公平性，在传输功率可以实现NOMA。此外，与OMA相比，NOMA可以为用户带来显著的功率节省。
We propose a tractable expression for the outage probability in single-cell uplink non-orthogonal multiple access (NOMA) systems serving an arbitrary number of users. The expression is obtained by approximating the inter-user interference using a shifted-gamma distributed random variable. We then formulate and propose an efficient iterative algorithm for the outage-constrained min–max power allocation problem for the NOMA system. To give a rigorous comparison, we solve the outage-constrained min–max power allocation problem for the orthogonal multiple access (OMA) counterpart where both the user power allocation and the radio resource division pattern are optimized. Simulations confirm the accuracy of the derived outage probability expression for the NOMA system. Also, we demonstrate that fairness among users in terms of transmission power can be achieved by NOMA. Moreover, NOMA can bring significant power savings to the users as compared with OMA.