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Energy Efficiency Optimization for Millimeter Wave System with Resolution-Adaptive ADCs
IEEE Wireless Communications Letters ( IF 6.3 ) Pub Date : 2020-09-01 , DOI: 10.1109/lwc.2020.2995908 Hualian Sheng , Xihan Chen , Xiongfei Zhai , An Liu , Min-Jian Zhao
IEEE Wireless Communications Letters ( IF 6.3 ) Pub Date : 2020-09-01 , DOI: 10.1109/lwc.2020.2995908 Hualian Sheng , Xihan Chen , Xiongfei Zhai , An Liu , Min-Jian Zhao
This letter investigates the uplink of a multi-user millimeter wave (mmWave) system, where the base station (BS) is equipped with a massive multiple-input multiple-output (MIMO) array and resolution-adaptive analog-to-digital converters (RADCs). Although employing massive MIMO at the BS can significantly improve the spectral efficiency, it also leads to high hardware complexity and huge power consumption. To overcome these challenges, we seek to jointly optimize the beamspace hybrid combiner and the ADC quantization bits allocation to maximize the system energy efficiency (EE) under some practical constraints. The formulated problem is non-convex due to the non-linear fractional objective function and the non-convex feasible set which is generally intractable. In order to handle these difficulties, we first apply some fractional programming (FP) techniques and introduce auxiliary variables to recast this problem into an equivalent form amenable to optimization. Then, we propose an efficient double-loop iterative algorithm based on the penalty dual decomposition (PDD) and the majorization-minimization (MM) methods to find local stationary solutions. Simulation results reveal significant gain over the baselines.
中文翻译:
具有分辨率自适应 ADC 的毫米波系统的能效优化
这封信研究了多用户毫米波 (mmWave) 系统的上行链路,其中基站 (BS) 配备了大规模多输入多输出 (MIMO) 阵列和分辨率自适应模数转换器 ( RADC)。虽然在基站采用大规模 MIMO 可以显着提高频谱效率,但也会导致硬件复杂度高和功耗大。为了克服这些挑战,我们寻求联合优化波束空间混合组合器和 ADC 量化位分配,以在一些实际约束下最大化系统能效 (EE)。由于非线性分数目标函数和通常难以处理的非凸可行集,制定的问题是非凸的。为了应对这些困难,我们首先应用一些分数规划 (FP) 技术并引入辅助变量将这个问题重新转换为适合优化的等效形式。然后,我们提出了一种基于惩罚对偶分解 (PDD) 和主要化-最小化 (MM) 方法的高效双循环迭代算法来寻找局部平稳解。仿真结果揭示了在基线上的显着增益。
更新日期:2020-09-01
中文翻译:
具有分辨率自适应 ADC 的毫米波系统的能效优化
这封信研究了多用户毫米波 (mmWave) 系统的上行链路,其中基站 (BS) 配备了大规模多输入多输出 (MIMO) 阵列和分辨率自适应模数转换器 ( RADC)。虽然在基站采用大规模 MIMO 可以显着提高频谱效率,但也会导致硬件复杂度高和功耗大。为了克服这些挑战,我们寻求联合优化波束空间混合组合器和 ADC 量化位分配,以在一些实际约束下最大化系统能效 (EE)。由于非线性分数目标函数和通常难以处理的非凸可行集,制定的问题是非凸的。为了应对这些困难,我们首先应用一些分数规划 (FP) 技术并引入辅助变量将这个问题重新转换为适合优化的等效形式。然后,我们提出了一种基于惩罚对偶分解 (PDD) 和主要化-最小化 (MM) 方法的高效双循环迭代算法来寻找局部平稳解。仿真结果揭示了在基线上的显着增益。