标题： 概率ODMA接收器在MIMO无源随机接入中的低复杂度算法 显示英文标题

标题： Probabilistic ODMA Receiver with Low-Complexity Algorithm for MIMO Unsourced Random Access

摘要： 在这项工作中，我们提出了用于多输入多输出（MIMO）系统中无源随机接入（URA）的非耦合导频和无导频开关键控（ODMA）接收机的设计。与非耦合导频ODMA不同，后者中的开关键控模式与导频选择相关联，非耦合导频和无导频ODMA减少了传输冗余，但面临着处理复杂性和容量性能的挑战。联合模式和数据检测器（JPDD）设计对于这些方案至关重要，但当前的JPDD算法具有高复杂性，计算成本呈二次增长。为了解决这个问题，我们提出了一种基于近似消息传递（AMP）的低复杂度检测器，该检测器提供线性复杂度，在欠定线性回归情况下提供了降低成本和改进性能的优势。解码通过无导频矩阵分解通过交替最小化来初始化，解决了相位和标量模糊问题。与现有的无导频方案相比，所提出的方法在复杂性和容量性能方面实现了13 dB的提升，并且具有更优的权衡。 显示英文摘要

摘要： In this work, we present the design for both pilot-uncoupled and pilot-free on-off multiple access (ODMA) receivers in unsourced random access (URA) for multiple-input multiple-output (MIMO) systems. Unlike pilot-coupled ODMA, where on-off patterns are linked to pilot selection, pilot-uncoupled and pilot-free ODMA reduce transmission redundancy but face challenges in processing complexity and capacity performance. The joint pattern and data detector (JPDD) design is critical for these schemes, but the current JPDD algorithm has high complexity with quadratic computational costs. To address this, we propose a low-complexity detector based on approximate message passing (AMP), which offers linear complexity, providing reduced cost and improved performance in the under-determined linear regression case. Decoding is initialized via pilot-free matrix factorization through alternating minimization, resolving phase and scalar ambiguities. Compared to existing pilot-free schemes, the proposed method achieves a 13 dB improvement and favorable trade-offs in complexity and capacity performance when compared to benchmarks.