莱斯信道下低精度ADC去蜂窝大规模MIMO系统的性能分析  

Performance Analysis of Cell-Free Massive MIMO System with Low-Resolution ADCs Under Rician Fading Channels

作　　者：闫秋娜[1] 金思年 岳殿武[1,2] 鞠默然 YAN Qiuna;JIN Sinian;YUE Dianwu;JU Moran(College of Information Science and Technology,Dalian Maritime University,Dalian,Liaoning 116026,China;State Key Laboratory of Millimeter Waves,Southeast University,Nanjing,Jiangsu 210096,China)

机构地区：[1]大连海事大学信息科学技术学院,辽宁大连116026 [2]东南大学毫米波国家重点实验室,江苏南京210096

出　　处：《信号处理》2022年第9期1903-1911,共9页Journal of Signal Processing

基　　金：国家自然科学基金(61971081);辽宁省博士启动项目(2022-BS-092);东南大学毫米波国家重点实验室开放课题基金(K202208)。

摘　　要：去蜂窝大规模多输入多输出(MIMO)系统被认为是未来6G通信的关键技术之一。然而,随着接入点(APs)和用户数量的激增,硬件成本问题成为了限制系统发展的重要因素。为了有效地降低硬件成本,可以考虑在AP和用户端配置低精度的模数转换器(ADCs)。基于上述原因,本文针对莱斯衰落信道下低精度ADC去蜂窝大规模MIMO系统展开研究。通过利用加性量化噪声模型,推导了该系统使用共轭转置预编码时的可达速率闭合表达式,并且该闭合表达式有助于研究AP的数量、ADC的精度以及莱斯K-因子对于可达速率的影响。此外,在保证每个用户的服务质量和每个AP的功率约束前提下,提出了一种能够最大化总速率的功率控制算法。最后,仿真结果表明了,相较不使用功率控制算法的情况,所提的算法能够带来更大的性能增益。The cell-free massive multiple-input multiple-output(MIMO)system is regarded as one of the key technologies in future 6G communications.However,with the rapid increase in the number of access points(APs)and users,the issue of hardware costs has become an important factor restricting the development of the cell-free massive system.In order to effectively reduce the hardware cost,we can consider configuring low-resolution analog-to-digital converters(ADCs)on the AP and the user.For these reasons,this paper focuses on cell-free massive MIMO system with low-resolution ADCs under Rician fading channels.Leveraging on the additive quantization noise model,the closed-form expression of achievable rate of this system is derived for conjugate beamforming precoding,which enables the study of effects of AP number,the resolution of ADC and Rician K-factor on the achievable rate.Moreover,a power control algorithm is proposed to maximize the sum achievable rate,subject to each user of quality-of-service constraint and each AP of power constraint.Finally,simulation results demonstrate that compared with the case of no power control algorithm,the proposed algorithm can bring greater performance gain.

关 键 词：去蜂窝大规模MIMO 莱斯衰落信道 低精度的模数转换器 功率控制算法 

分 类 号：TN911.23[电子电信—通信与信息系统]