论文标题
D2D通信和无细胞的大型MIMO系统的共存，具有低分辨率ADC，可改善5G网络的吞吐量
Coexistence of D2D Communications and Cell-Free Massive MIMO Systems With Low Resolution ADC for Improved Throughput in Beyond-5G Networks
论文作者
论文摘要
在本文中，研究了访问点（APS）配备了低分辨率模拟到数字化的转换器（ADCS），研究了与设备对装置（D2D）通信链路共存的无细胞大量多输入多输出（CF-MMIMO）系统的上行链路传输。 D2D用户（会费）和CF-MIMO用户（CFUE）的可实现率的下限均以封闭形式得出，并具有完美和不完美的渠道状态信息。接下来，为了减少试点污染，提出并分析了基于图形的试验算法，并分析了考虑的情况。此外，为了控制干扰和提高性能，设计了两种功率控制策略，还讨论了它们的复杂性和收敛性。第一个功率控制策略旨在最大化CFUES的总和光谱效率（SE），但要在会费上的服务限制下，而第二个则最大程度地提高了CFUES的加权产品和“信号到'信号与互换）的加权产品（SINRS）。数值结果表明，拟议的飞行员和权力分配给网络SE带来了可观的改进。同样，据透露，D2D链接的激活对系统吞吐量有积极影响，即D2D链接确保了网络卸载克服了D2D通信带来的干扰。
In this paper, uplink transmission of a cell-free massive multiple-input multiple-output (CF-mMIMO) system coexisting with device-to-device (D2D) communication links is investigated, under the assumption that access points (APs) are equipped with low-resolution analog-to-digital converters (ADCs). Lower bounds of achievable rates for both D2D users (DUEs) and CF-mMIMO users (CFUEs) are derived in closed-form, with perfect and imperfect channel state information. Next, in order to reduce pilot contamination, greedy and graph coloring-based pilot allocation algorithms are proposed and analyzed for the considered scenario. Furthermore, to control interference and improve the performance, two power control strategies are designed and their complexity and convergence are also discussed. The first power control strategy aims at maximizing CFUEs' sum spectral efficiency (SE) subject to quality of service constraints on DUEs, while the second one maximizes the weighted product of CFUEs' and DUEs' signal-to-interference-plus-noise-ratios (SINRs). Numerical results show that the proposed pilot and power allocations bring a considerable improvement to the network SE. Also, it is revealed that the activation of D2D links has a positive effect on the system throughput, i.e. the network offloading ensured by the D2D links overcomes the increased interference brought by D2D communications.
