论文标题
与未知延迟的SCMA的异步多源检测：一种压缩传感方法
Asynchronous Multiuser Detection for SCMA with Unknown Delays: A Compressed Sensing Approach
论文作者
论文摘要
尽管是越来越多的研究的主题，但非正交的多重访问仍未获得足够的支持，无法纳入现代标准中。非正交多访问的最有前途的方法之一是稀疏代码多重访问，它试图利用非正交的，稀疏的扩散代码与传统正交方法更有效地共享用户之间的带宽。几乎所有有关稀疏代码多重访问的研究都假定在接收方的同步，这可能并不总是一个实际的假设。在这项工作中，我们旨在通过放弃同步的假设来使这项有希望的技术更接近实际实现。因此，我们提出了一种基于压缩感应的延迟估计技术，专门为上行链路稀疏代码多访问系统开发。所提出的技术几乎可以与现有文献中提出的几乎所有解码算法一起使用，包括流行的消息传递方法。此外，我们得出了有关该技术的恢复性能的理论结合，并使用仿真来证明其在实用上行链路系统中的生存能力。
Despite being the subject of a growing body of research, non-orthogonal multiple access has failed to garner sufficient support to be included in modern standards. One of the more promising approaches to non-orthogonal multiple access is sparse code multiple access, which seeks to utilize non-orthogonal, sparse spreading codes to share bandwidth among users more efficiently than traditional orthogonal methods. Nearly all of the studies regarding sparse code multiple access assume synchronization at the receiver, which may not always be a practical assumption. In this work, we aim to bring this promising technology closer to a practical realization by dropping the assumption of synchronization. We therefore propose a compressed sensing-based delay estimation technique developed specifically for an uplink sparse code multiple access system. The proposed technique can be used with nearly all of the numerous decoding algorithms proposed in the existing literature, including the popular message passing approach. Furthermore, we derive a theoretical bound regarding the recovery performance of the proposed technique, and use simulations to demonstrate its viability in a practical uplink system.
