Millimeter wave systems suffer from high power consumption and are constrained to use low resolution quantizers --digital to analog and analog to digital converters (DACs and ADCs). However, low resolution quantization leads to reduced data rate and increased out-of-band emission noise. In this paper, a multiple-input multiple-output (MIMO) system with linear transceivers using low resolution DACs and ADCs is considered. An information-theoretic analysis of the system to model the effect of quantization on spectrospatial power distribution and capacity of the system is provided. More precisely, it is shown that the impact of quantization can be accurately described via a linear model with additive independent Gaussian noise. This model in turn leads to simple and intuitive expressions for spectrospatial power distribution of the transmitter and a lower bound on the achievable rate of the system. Furthermore, the derived model is validated through simulations and numerical evaluations, where it is shown to accurately predict both spectral and spatial power distributions.
翻译:千米波系统受到高功率消耗的影响,并不得不使用低分辨率的量子系统 -- -- 数字到模拟和模拟到数字转换器(DACs和ADCs) -- -- 然而,低分辨率的量子化导致数据率下降和带外排放噪音增加。在本文中,考虑使用低分辨率的DACs和ADCs的线性传输器(MIIMO)多输入多输出器(MIMO)系统;提供对系统的信息理论分析,以模拟量化对系统光谱空间能量分布和能力的影响。更确切地说,量化的影响可以通过一个带有独立高斯噪音添加剂的线性模型准确描述。这一模型反过来又导致发报机光力分布的简单和直观的表达方式,对系统可实现的速率的更低约束。此外,通过模拟和数字评估对衍生模型进行验证,显示其准确预测光谱和空间功率分布。