论文标题
动态网络中无授予FTN-NOMA的联合数据和主动用户检测
Joint Data and Active User Detection for Grant-free FTN-NOMA in Dynamic Networks
论文作者
论文摘要
比Nyquist（FTN）信号传导和非正交多访问（NOMA）更快的速度都有希望的下一代无线通信技术，这是它们提高系统光谱效率的能力的好处。本文考虑了一个上行链路系统，该系统结合了FTN和NOMA的优势。因此，通过故意引入符号间干扰（ISI）和用户间干扰（IUI）来实现提高的光谱效率。更具体地说，我们提出了一种无授予的传输方案，以减少所考虑的NOMA系统的信号传导开销和传输潜伏期。为了区分主动用户和不活跃的用户，我们开发了一个新的消息传递接收器，该消息可以共同估算渠道状态，检测用户活动并执行解码。与正交传输系统相比，我们通过量化合并的FTN-NOMA方案实现的显着光谱效率增益来结束，该效率增益高达87.5％。
Both faster than Nyquist (FTN) signaling and non-orthogonal multiple access (NOMA) are promising next generation wireless communications techniques as a benefit of their capability of improving the system's spectral efficiency. This paper considers an uplink system that combines the advantages of FTN and NOMA. Consequently, an improved spectral efficiency is achieved by deliberately introducing both inter-symbol interference (ISI) and inter-user interference (IUI). More specifically, we propose a grant-free transmission scheme to reduce the signaling overhead and transmission latency of the considered NOMA system. To distinguish the active and inactive users, we develop a novel message passing receiver that jointly estimates the channel state, detects the user activity, and performs decoding. We conclude by quantifying the significant spectral efficiency gain achieved by our amalgamated FTN-NOMA scheme compared to the orthogonal transmission system, which is up to 87.5%.
