论文标题
构造下行链路MU-MISO系统的1位发射信号向量：QAM星座
Construction of 1-Bit Transmit Signal Vectors for Downlink MU-MISO Systems: QAM constellations
论文作者
论文摘要
在本文中，我们调查了在具有成本效益的1位数字到分析转换器下具有大量天线阵列的基站发射信号的构建。由于粗糙的非线性特性，常规的预编码方法无法在严重的错误地板问题的情况下产生有吸引力的性能。此外，由于其组合性质，找到最佳的传输信号在计算上是不可信的。因此，有效构造1位传输信号仍然是一个开放的问题。作为我们早期工作的扩展，我们提出了一种有效的方法，可以在正交振幅调制星座下构建1位传输信号。在此方面，我们首先得出所谓的可行性条件，该条件确保每个用户的无噪声观察属于所需的决策区域，然后将其转换为线性约束。考虑到对加性噪声的鲁棒性，提出的施工方法被公式化为定义明确的混合式线性编程问题。基于此，我们开发了一种低复杂性算法来求解它（等效地，生成1位传输信号）。通过模拟，我们根据计算复杂性和检测性能来验证所提出的方法的优越性。
In this paper, we investigate the construction of a transmit signal for a base station with a massive number of antenna arrays under the cost-effective 1-bit digital-to-analog converters. Due to the coarse nonlinear property, conventional precoding methods could not yield an attractive performance with a severe error-floor problem. Moreover, finding an optimal transmit signal is computationally implausible because of its combinatorial nature. Thus, it is still an open problem to construct a 1-bit transmit signal efficiently. As an extension of our earlier work, we propose an efficient method to construct an 1-bit transmit-signal under quadrature-amplitude-modulation constellations. Toward this, we first derive the so-called feasibility condition which ensures that every user's noiseless observation belongs to a desired decision region, and then transform it as linear constraints. Taking into account the robustness to an additive noise, the proposed construction method is formulated as a well-defined mixed-integer-linear-programming problem. Based on this, we develop a low-complexity algorithm to solve it (equivalently, to generate a 1-bit transmit signal). Via simulations, we verify the superiority of the proposed method in terms of a computational complexity and detection performance.
