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arXiv 1708.03065cs.ITmath.IT
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具有功率域NOMA的异构网络:覆盖、吞吐量和功率分配分析

Heterogeneous Networks with Power-Domain NOMA: Coverage, Throughput and Power Allocation Analysis

Chun-Hung Liu, Di-Chun Liang

摘要:

在异构蜂窝网络(HetNet)中,考虑HetNet中的基站能够通过执行功率域非正交多址(NOMA)方案在下行链路中同时调度和服务K个用户。本文旨在对HetNet的下行链路覆盖和吞吐量性能的初步研究与非合作和(建议)合作NOMA计划。首先,研究了每个小区K个用户的覆盖概率和链路吞吐量,推导出了非协作NOMA方案的精确表达式,在非协作NOMA方案中,没有基站协调为特定用户联合发送NOMA信号。我们表明,覆盖范围和链路吞吐量可以大大减少,如果K个用户之间的发射功率分配不满足推导出的约束。接下来,我们分析了K个用户的NOMA合作计划,其中没有用户的空基站协调,以提高最远的NOMA用户在一个小区的覆盖范围和链路吞吐量。精确的仿真结果表明,合作NOMA可以显著提高网络的覆盖范围和链路吞吐量。最后,我们表明,存在最佳的功率分配方案,最大限度地提高平均小区覆盖率和吞吐量下的一些派生的功率分配约束和数值结果验证了我们的分析结果。

英文摘要:

In a heterogeneous cellular network (HetNet), consider that a base station in the HetNet is able to simultaneously schedule and serve K users in the downlink by performing the power-domain non-orthogonal multiple access (NOMA) scheme. This paper aims at the preliminary study on the downlink coverage and throughput performances of the HetNet with the non-cooperative and the (proposed) cooperative NOMA schemes. First, the coverage probability and link throughput of K users in each cell are studied and their accurate expressions are derived for the non-cooperative NOMA scheme in which no BSs are coordinated to jointly transmit the NOMA signals for a particular user. We show that the coverage and link throughput can be largely reduced if transmit power allocations among the K users do not satisfy the constraint derived. Next, we analyze the coverage and link throughput of K users for the cooperative NOMA scheme in which the void BSs without users are coordinated to enhance the farthest NOMA user in a cell. The derived accurate results show that cooperative NOMA can significantly improve the coverage and link throughput of all users. Finally, we show that there exist optimal power allocation schemes that maximize the average cell coverage and throughput under some derived power allocation constraints and numerical results validate our analytical findings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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