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arXiv 2202.08925eess.SPcs.ITmath.IT
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有限容量前传下MU-MIMO的量化感知预编码

Quantisation-aware Precoding for MU-MIMO with Limited-capacity Fronthaul

Yasaman Khorsandmanesh, Emil Björnson, Joakim Jaldèn

摘要:

5G及以后的基站使用先进的天线系统(AAS),其中多个无源天线元件和无线电单元集成到单个盒子中。这种系统的关键瓶颈是AAS和基带单元(BBU)之间的数字前传,其具有有限的容量。在本文中,我们研究了一种用于预编码下行链路传输多用户多输入多输出(MU-MIMO)信道的AAS。首先,我们提出了当在BBU处计算预编码器并且然后量化以通过前传发送时创建的基线量化未知预编码方案。我们提出了一种新的预编码设计,是知道的前传量化。我们制定了一个优化问题,以最小化接收端的均方误差。数值结果表明,本文提出的预编码算法在和速率方面大大优于量化未知预编码算法。

英文摘要:

Base stations in 5G and beyond use advanced antenna systems (AASs), where multiple passive antenna elements and radio units are integrated into a single box. A critical bottleneck of such a system is the digital fronthaul between the AAS and baseband unit (BBU), which has limited capacity. In this paper, we study an AAS used for precoded downlink transmission over a multi-user multiple-input multiple-output (MU-MIMO) channel. First, we present the baseline quantization-unaware precoding scheme created when a precoder is computed at the BBU and then quantized to be sent over the fronthaul. We propose a new precoding design that is aware of the fronthaul quantization. We formulate an optimization problem to minimize the mean squared error at the receiver side. We rewrite the problem to utilize mixed-integer programming to solve it. The numerical results manifest that our proposed precoding greatly outperforms quantization-unaware precoding in terms of sum rate.

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