低分辨率ADCs/DACs和低质量RF链技术辅助的D2D协助去蜂窝大规模MIMO系统

RF Impairments for D2D-Aided Cell-Free Massive MIMO with Low-Resolution ADCs/DACs

为了有效地解决当前频谱资源稀缺的问题,同时满足未来对大规模的无线接入和高速率的急剧需求,本文提出了低分辨率模数转换(analog-to-digital converters, ADCs)/数模转换(digital-to-analog converters, ADCs)和低质量射频(radio frequency, RF)链技术辅助的终端直连(device-to-device, D2D)协助去蜂窝大规模多入多出(multiple-input multiple-output, MIMO)系统,通过D2D分担数据传输压力,低分辨率ADCs/DACs和低质量RF链技术可用于减少硬件开销,从而提升系统传输速率与能量效率。研究发现增加接入点(access points, APs) APs数量、AP天线数量和D2D用户(D2D user, DUE)天线数量可以有效地提升系统的总速率,当比特数等于16或质量因子等于1时,系统总速率和总能量效率达到最优。此外,增加DUEs密度可以极大地提升系统的性能。研究结果为未来去蜂窝大规模MIMO的实际部署提供了参考方案。

To effectively solve the problem of spectrum scarcity and meet the sharp demand for large-scale wireless access and high speed in the future, this paper proposes the radio frequency (RF) impairments for device-to-device (D2D)-aided cell-free massive multiple-input multiple-output (MIMO) with low-resolution analog-to-digital converters (ADCs)/digital-to-analog converters (DACs). Through D2D to share the data transmission pressure, low-resolution ADCs/DACs, and low-quality RF chain technology can reduce the hardware overhead, thereby improving the system transmission rate and energy efficiency. It is found that increasing the number of access points (APs), AP antennas, and D2D user (DUE) antennas can effectively improve the sum rate of the system. When bits = 16 or quality factor = 1, the system’s sum rate and energy efficiency are optimal. In addition, increasing the density of DUEs can greatly improve the system’s performance. The results provide a reference for the future deployment of cell-free massive MIMO.