Millimeter wave(mmWave) and large-scale multiple input multiple output(MIMO) are two emerging technologies in fifth-generation wireless communication systems. The power consumption and hardware cost of radio frequency...Millimeter wave(mmWave) and large-scale multiple input multiple output(MIMO) are two emerging technologies in fifth-generation wireless communication systems. The power consumption and hardware cost of radio frequency(RF) chains increase exponentially with the bit resolution of analog-to-digital converters(ADCs) and digital-to-analog converters(DACs). One promising solution is to employ few RF chains with low-bit ADCs and DACs. In this paper, we consider mmWave large-scale MIMO systems with low bits DACs and ADCs. Leveraging on the Bussgang theorem and the additive quantization noise model(AQNM), a closed-form expression of the achievable rate is derived to show the effect of the ADCs? and DACs? resolution. Moreover, an orthogonal matching pursuit(OMP) based hybrid precoding algorithm is proposed to increase the achievable rate. Our results show that the impact of DACs is more pronounced than the impact of ADCs. Furthermore, 5-bit ADCs and DACs are sufficient at the transceiver to operate without a significant performance loss.展开更多
在数字通信系统中,调制技术和信道编码技术是最为关键的物理层技术,它们分别决定着系统的频谱利用率和可靠性。MIMO(Multiple Input and Multipul Output,多输入多输出)技术作为一项空域调制技术,可同时由多根天线发送数据,提高了频谱...在数字通信系统中,调制技术和信道编码技术是最为关键的物理层技术,它们分别决定着系统的频谱利用率和可靠性。MIMO(Multiple Input and Multipul Output,多输入多输出)技术作为一项空域调制技术,可同时由多根天线发送数据,提高了频谱利用率,在接收端利用信号之间的空域自由度进行检测;LDPC码也被证明是目前在各种信道条件下最接近香农信道容量的信道编码技术。在新一代5G数字通信系统的技术研究中,目前已经确定LDPC编码和大规模MIMO分别入选长码数据编码和调制的技术方案。本文将对这两项关键技术的概念和性能进行简要介绍,以期帮助移动通信从业人员建立对这些技术及其性能优势的基本认识。展开更多
基金supported in part by the National Key R&D Program of China (No. 2016YFE0200900)Major Projects of Beijing Municipal Science and Technology Commission (No. Z181100003218010)+3 种基金National Natural Science Foundation of China (Nos. 61601020, 61725101 and U1834210)the Beijing Natural Science Foundation (Nos. 4182049, L171005 and L172020)the open research fund of National Mobile Communications Research Laboratory, Southeast University (No. 2018D04)Key Laboratory of Optical Communication and Networks (No. KLOCN2018002)
文摘Millimeter wave(mmWave) and large-scale multiple input multiple output(MIMO) are two emerging technologies in fifth-generation wireless communication systems. The power consumption and hardware cost of radio frequency(RF) chains increase exponentially with the bit resolution of analog-to-digital converters(ADCs) and digital-to-analog converters(DACs). One promising solution is to employ few RF chains with low-bit ADCs and DACs. In this paper, we consider mmWave large-scale MIMO systems with low bits DACs and ADCs. Leveraging on the Bussgang theorem and the additive quantization noise model(AQNM), a closed-form expression of the achievable rate is derived to show the effect of the ADCs? and DACs? resolution. Moreover, an orthogonal matching pursuit(OMP) based hybrid precoding algorithm is proposed to increase the achievable rate. Our results show that the impact of DACs is more pronounced than the impact of ADCs. Furthermore, 5-bit ADCs and DACs are sufficient at the transceiver to operate without a significant performance loss.
文摘在数字通信系统中,调制技术和信道编码技术是最为关键的物理层技术,它们分别决定着系统的频谱利用率和可靠性。MIMO(Multiple Input and Multipul Output,多输入多输出)技术作为一项空域调制技术,可同时由多根天线发送数据,提高了频谱利用率,在接收端利用信号之间的空域自由度进行检测;LDPC码也被证明是目前在各种信道条件下最接近香农信道容量的信道编码技术。在新一代5G数字通信系统的技术研究中,目前已经确定LDPC编码和大规模MIMO分别入选长码数据编码和调制的技术方案。本文将对这两项关键技术的概念和性能进行简要介绍,以期帮助移动通信从业人员建立对这些技术及其性能优势的基本认识。