电子学报 ›› 2021, Vol. 49 ›› Issue (11): 2138-2145.DOI: 10.12263/DZXB.20200773

• 学术论文 • 上一篇    下一篇

多波束赋形在非正交多址接入技术中的应用研究

刘彦平, 侯蓉晖   

  1. 西安电子科技大学网络与信息安全学院, 陕西 西安 710071
  • 收稿日期:2020-07-24 修回日期:2021-01-18 出版日期:2021-11-25 发布日期:2021-11-25
  • 作者简介:刘彦平 男, 1994年7月出生,陕西渭南人.现为西安电子科技大学通信工程学院研究生.主要研究方向为5G和无人机通信.E‑mail:ypliu721@stu.xidian.edu.cn
    侯蓉晖 女, 1980年6月出生,陕西白水人.现为西安电子科技大学网络与信息安全学院教授.主要研究方向为车联网、卫星组网、网络安全.E‑mail: rhhou@xidian.edu.cn
  • 基金资助:
    国家自然科学基金(61571351);陕西省自然科学基金(2018JZ6006);陕西省重点研发计划(2019ZDLGY12?08)

Research on the Application of Beamforming in Non‑orthogonal Multiple Access Technology

Yan-ping LIU, Rong-hui HOU   

  1. School of Cyber Engineering,Xidian University,Xi’an,Shaanxi 710071,China
  • Received:2020-07-24 Revised:2021-01-18 Online:2021-11-25 Published:2021-11-25

摘要:

为解决非正交多址接入(NOMA)技术在毫米波Massive MIMO系统中用户的分组受限于基站波束宽度的问题,提出了一种能够产生指向多个方向的波束的波束赋形方案.基于该多波束波束赋形方案,建立了多小区多用户场景下的用户资源分配的数学模型.为降低计算的复杂性,采用两阶段的资源分配算法.在第一阶段中,在给定的功率分配条件下将模型转化为联盟博弈中联盟的生成问题,并提出一种通过迭代确定用户分组和天线单元分配的算法;在第二阶段中,通过将非凸的数学优化问题转化为DC规划问题,提出用户功率分配的算法.仿真结果表明,本文所提多波束波束赋形方案能够有效产生指向多个方向的波束,且所提资源分配算法能够有效提高系统的性能.

关键词: 非正交多址接入, 波束赋形, 大规模多输入多输出

Abstract:

In order to solve the problem that the user grouping of non?orthogonal multiple access (NOMA) in the mm?wave massive MIMO system is limited by the beam width of the base station, a beamforming scheme which can generate beams pointing in multiple directions is proposed. Based on the multi?beam beamforming scheme, a mathematical model of user resource allocation in multi?cell and multi?user scenario is established. In order to reduce the complexity of computation, a two?stage resource allocation algorithm is adopted. In the first stage, under the given power allocation conditions, the model is transformed into the coalition generation in the coalition game theory, and an algorithm for iteratively determining user grouping and antenna unit allocation is proposed; in the second stage, an algorithm of user power allocation is proposed by transforming the non?convex mathematical optimization problem into a DC programming problem. The simulation results show that the proposed multi?beam beamforming scheme can effectively generate beams pointing to multiple directions, and the proposed resource allocation algorithm can effectively improve the performance of the system.

Key words: non?orthogonal multiple access(NOMA), beamforming, massive MIMO

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