Herein, a precoding scheme is developed for orthogonal frequency division multiplexing (OFDM) transmission in multiple-input multiple-output (MIMO) systems that use one-bit digital-to-analog converters (DACs) and analog-to-digital converters (ADCs) at the transmitter and receiver, respectively, as a means to reduce the power consumption. Two different one-bit architectures are presented. In the first, a single user MIMO system is considered where the DACs and ADCs of the transmitter and the receiver are assumed to be one-bit and in the second, a network of analog phase shifters is added at the receiver as an additional analog-only processing step with the view to mitigate some of the effects of coarse quantization. The precoding design problem is formulated and then split into two NP-hard optimization problems, which are solved by an algorithmic solution based on the Cyclic Coordinate Descent (CCD) framework. The design of the analog post-coding matrix for the second architecture is decoupled from the precoding design and is solved by an algorithm based on the alternating direction method of multipliers (ADMM). Numerical results show that the proposed precoding scheme successfully mitigates the effects of coarse quantization and the proposed systems achieve a performance close to that of systems equipped with full resolution DACs/ADCs.

中文翻译：

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基于一位 DAC 和 ADC 的 MIMO-OFDM 收发器架构的联合符号级预编码和组合


本文中，开发了一种用于多输入多输出（MIMO）系统中的正交频分复用（OFDM）传输的预编码方案，该系统使用一位数模转换器（DAC）和模数转换器（ADC） ）分别在发送器和接收器处作为降低功耗的一种手段。提出了两种不同的一位架构。第一种，考虑单用户 MIMO 系统，其中发射机和接收机的 DAC 和 ADC 被假定为一位；第二种，在接收机处添加模拟移相器网络作为额外的模拟唯一的处理步骤是为了减轻粗量化的一些影响。制定预编码设计问题，然后将其分解为两个 NP 难优化问题，并通过基于循环坐标下降 (CCD) 框架的算法解决方案来求解。第二架构的模拟后编码矩阵的设计与预编码设计解耦，并且通过基于乘法器交替方向法(ADMM)的算法来求解。数值结果表明，所提出的预编码方案成功地减轻了粗量化的影响，并且所提出的系统实现了接近配备全分辨率 DAC/ADC 的系统的性能。