Spatial Reuse for Coexisting LTE and Wi-Fi Systems in Unlicensed Spectrum
Spatial Reuse for Coexisting LTE and Wi-Fi Systems in Unlicensed Spectrum
复制标题
未授权频谱中共存 LTE 和 Wi-Fi 系统的空间复用
DOI：
10.1109/twc.2017.2776932
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发表时间：
2018-02
影响因子：
10.4
通讯作者：
Geoffrey Ye Li
中科院分区：
文献类型：
--
作者：
Rui Yin;Amine Marref;Geoffrey Ye Li
在本文中，我们利用多天线发射波束成形技术，以使空间重用的LTE和Wi-Fi系统在未授权频谱共存。对于配备有多个发射天线并且在未许可频谱中操作的蜂窝小型小区基站，一些空间自由度（DoF）专用于服务小型小区用户终端（SUE），并且其他空间自由度用于通过应用线性多用户预编码技术（诸如迫零发射波束成形（ZFBF））来减轻对共存的同信道Wi-Fi用户的干扰。通过空间DoF的仔细分配，可以实现未授权频谱资源的增强的空间重用，从而提高未授权频带上的频谱效率。然而，由于固有的信道状态信息（CSI）估计和反馈错误，ZFBF不能完全减轻有害的同信道干扰的影响。在分析SUE之间的所谓无线电技术内（RAT内）干扰之后，即，ZFBF中使用的不完美CSI所引起的残余干扰以及Wi-Fi用户所经历的RAT间干扰，我们分别推导出共存的LTE和Wi-Fi系统的吞吐量。基于导出的吞吐量，可以最优地分配空间DoF和功率，以在不同场景中平衡小小区和Wi-Fi系统之间的吞吐量。我们的理论分析和提出的方案进一步证实了详尽的数值模拟结果。
In this paper, we leverage multi-antenna transmit beamforming techniques in order to enable spatial reuse for coexisting LTE and Wi-Fi systems in unlicensed spectrum. For the cellular small cell base stations equipped with multiple transmit antennas and operating in the unlicensed spectrum, some spatial degrees of freedom (DoF)s are dedicated to serving small cell user terminals (SUEs) and others are employed to mitigate interference to the co-existing co-channel Wi-Fi users by applying a linear multi-user precoding technique, such as zero-forcing transmit beamforming (ZFBF). Through careful allocation of spatial DoFs, enhanced spatial reuse of unlicensed spectrum resources can be achieved, thereby improving spectrum efficiency on unlicensed bands. However, due to inherent channel state information (CSI) estimation and feedback errors, ZFBF cannot completely alleviate detrimental co-channel interference effects. After analysing the so-called intra radio technology (intra-RAT) interference among SUEs, i.e., the residual interference caused by imperfect CSI used in ZFBF, and the inter-RAT interference experienced by the Wi-Fi users, we derive the throughput of the co-existing LTE and Wi-Fi systems, respectively. Based on the derived throughput, spatial DoF and power can be optimally allocated to balance the throughput between the small cell and Wi-Fi systems in different scenarios. Our theoretical analysis and proposed schemes are further confirmed with exhaustive numerical simulation results.
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DOI：
10.1109/glocom.2017.8254944
发表时间：
2017-08
期刊：
GLOBECOM 2017 - 2017 IEEE Global Communications Conference
影响因子：
--
作者：
Rui Yin;A. Maaref;Geoffrey Y. Li
通讯作者：
Rui Yin;A. Maaref;Geoffrey Y. Li
影响因子：
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DOI：
10.1109/icc.2016.7511073
发表时间：
2016-05
期刊：
2016 IEEE International Conference on Communications (ICC)
影响因子：
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作者：
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通讯作者：
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影响因子：
1.9
作者：
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DOI：
10.1109/icc.2012.6364851
发表时间：
2012-06
期刊：
2012 IEEE International Conference on Communications (ICC)
影响因子：
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作者：
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