论文标题
与大量MIMO的编码随机访问的联合PHY和MAC层设计
A Joint PHY and MAC Layer Design for Coded Random Access with Massive MIMO
论文作者
论文摘要
无赠款访问计划是候选人，旨在支持未来的大规模多个访问应用程序，因为它们可以减少控制信号和延迟。作为一类有希望的无赠款计划，编码的随机访问方案也可以通过不协调的传输以及在存在数据包碰撞的情况下实现高可靠性。在本文中，提出并利用用于系统设计和优化的密度演化的分析工具，基于密度演变。与现有文献形成鲜明对比的是，在简化的通道假设下开发了此类工具，该工具不仅捕获MAC层特征，还捕获了物理无线褪色通道和基于多个天线和随机选择的正交飞行员的实际物理层信号处理。通过与符号级蒙特卡洛模拟进行比较来验证理论结果。
Grant-free access schemes are candidates to support future massive multiple access applications owing to their capability to reduce control signaling and latency. As a promising class of grant-free schemes, coded random access schemes can achieve high reliabilities also with uncoordinated transmissions and therefore in presence packet collisions. In this paper, an analysis tool for coded random access, based on density evolution, is proposed and exploited for system design and optimization. In sharp contrast with the existing literature, where such tools have been developed under simplified channel assumptions, the proposed tool captures not only MAC layer features, but also the physical wireless fading channel and a realistic physical layer signal processing based on multiple antennas and randomly-chosen orthogonal pilots. Theoretical results are validated by comparison with symbol-level Monte Carlo simulations.
