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Massive MIMO-Based Underlay Spectrum Access Under Incomplete and/or Imperfect Channel State Information
IEEE Transactions on Cognitive Communications and Networking ( IF 8.6 ) Pub Date : 2022-05-02 , DOI: 10.1109/tccn.2022.3171773
E. Venkata Pothan 1 , Salil Kashyap 1
Affiliation  

We investigate use of massive number of antennas at cognitive base station (BS) in reducing interference caused to primary users (PUs) under incomplete and/or imperfect channel state information (CSI) without deteriorating sum spectral efficiency of cognitive users (CUs). We derive analytical expressions for complement of interference outage probability with incomplete and/or imperfect CSI. These novel expressions provide ballpark number for the amount of back-off required to meet interference constraint. We deduce new expressions for sum spectral efficiency of CUs with MR beamforming under incomplete and/or imperfect CSI. We prove that under imperfect CSI, by deploying more antennas at cognitive BS, interference outage probability can be reduced while keeping sum spectral efficiency of CUs fixed. And larger number of PUs can be accommodated in the network while keeping interference outage probability at PUs and sum spectral efficiency of CUs fixed. Furthermore, outage probability reduces as number of channels ${S}$ to which CSI is available increases, since the constraint is violated less often. And by deploying more antennas at cognitive BS, sum spectral efficiency of CUs can be kept fixed even if ${S}$ decreases. Impact of spatial correlation on outage probability at PUs and sum spectral efficiency of CUs is also elucidated.

中文翻译:

不完整和/或不完整信道状态信息下基于大规模 MIMO 的底层频谱接入

我们研究了在认知基站 (BS) 上使用大量天线来减少在不完整和/或不完善的信道状态信息 (CSI) 下对主要用户 (PU) 造成的干扰,而不会降低认知用户 (CU) 的总频谱效率。我们推导出具有不完整和/或不完整 CSI 的干扰中断概率补充的解析表达式。这些新颖的表达式为满足干扰约束所需的回退量提供了大致数。我们推导出了在不完整和/或不完美 CSI 下具有 MR 波束成形的 CU 总频谱效率的新表达式。我们证明了在不完美的 CSI 下,通过在认知基站部署更多的天线,可以降低干扰中断概率,同时保持 CU 的总频谱效率固定。并且可以在网络中容纳更多数量的 PU,同时保持 PU 的干扰中断概率和 CU 的总频谱效率固定。此外,中断概率随着信道数量的增加而降低 ${S}$CSI 可用的数量会增加,因为约束被违反的频率较低。通过在认知基站部署更多天线,CU 的总频谱效率可以保持固定,即使 ${S}$减少。还阐明了空间相关性对 PU 中断概率和 CU 总频谱效率的影响。
更新日期:2022-05-02
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