Exploring Uplink Achievable Rate for HPO MIMO Through Quasi-Monte Carlo and Variance Reduction Techniques
Exploring Uplink Achievable Rate for HPO MIMO Through Quasi-Monte Carlo and Variance Reduction Techniques
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DOI：
10.1109/access.2020.2989235
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
Yi Gong;Lin Zhang;Keping Yu;Renping Liu
中科院分区：
文献类型：
--
作者：
Yi Gong;Lin Zhang;Keping Yu;Renping Liu
在毫米波和大规模多输入多输出（MIMO）通信系统中，由于宽带和大量天线的使用，接收端的功耗将急剧增加。最近提出了一种半纯相位MIMO（HPO MIMO）方案来克服上述问题，其中基站（BS）获取复包络信号的$\pi $ -周期相位测量。由于HPO MIMO的非线性性质，可实现速率的估值非常具有挑战性。本文的目的是提供一种有效的方法来计算HPO MIMO系统的可达速率。利用互信息理论，将可达速率转化为两个高维积分的和。然而，当使用传统的蒙特-卡罗方法时，计算这些积分遭受巨大的计算负担。为了提高效率，提出了一种将拟蒙特卡罗方法与方差缩减技术相结合的新方法。此外，我们推导了HPO MIMO系统的概率密度函数（PDF），并分析了HPO MIMO方案的上行链路可达速率。数值结果表明，我们提出的方法是有效的计算HPO MIMO系统的可达速率。通过所提出的方法，我们证实了HPO MIMO在未来低功耗通信场景中是一种很有前途的技术。
The power consumption at the receiver side will be dramatically increased in the millimetre-wave and massive multiple-input-multiple-output (MIMO) communication systems due to the wide bandwidth and a large number of antennas adopted. A half phase-only MIMO (HPO MIMO) scheme, in which the base station (BS) acquires $\pi $ -periodic phase measurements of the complex envelop signals was proposed very recently to overcome the above problem. Due to the non-linear nature of HPO MIMO, the valuation of the achievable rate is very challenging. The purpose of the paper is to provide an efficient method for calculating the achievable rate of the HPO MIMO system. By the mutual information theory, we transform the achievable rate into a sum of two high-dimensional integrations. However, calculating those integrations suffers from the enormous computational burden when using the traditional Monte-Carlo method. In order to increase efficiency, a new method by combining quasi-Monte Carlo with a variance reduction technique is proposed. Besides, we derive the probability density function (PDF) of the HPO MIMO system and analyze the uplink achievable rate of the HPO MIMO scheme. Numerical results show that our proposed method is efficient for calculating the achievable rate of the HPO MIMO system. With the proposed method we confirm that HPO MIMO is a promising technology in future low-power communication scenarios.