论文标题
NOMA系统的双极近乎等效的紧密框架
Bipolar Almost Equiangular Tight Frames for NOMA Systems
论文作者
论文摘要
非正交的多重访问（NOMA）是一个在多源网络中广受欢迎的概念。这是由于它在整个网络吞吐量方面的优势。它在大型网络（例如物联网（IoT）网络或5G网络）中变得尤为重要。 DS-CDMA Noma是已知的NOMA技术之一，它利用非正交编码方案来优化多源网络的容量。众所周知，等缘紧密帧（ETF）是该技术的最佳序列集（以容量意义）。不幸的是，ETF仅限于非常具体的用户编号和序列长度对，这些长度和序列长度对实际系统构成了不良约束。在本文中，我们的目标是通过提出替代性非正交序列的替代家族来打破这些约束，一方面具有与ETF相似的属性（因此，我们将它们表示为几乎是ETF），另一方面，没有对用户的数量和序列长度的限制。我们是从已知的构建标准ETF的技术开始，并通过对构建AETF的技术进行稍作修改而扩展其方法。在本文中，我们将专注于双极性（+/- 1值），并且相对较短（长度为100个序列），因为我们对序列感兴趣，该序列对实际系统具有实际价值。
Non-Orthogonal Multiple Access (NOMA) is a concept which is gaining a big popularity in multiuser networks. It's due to its advantages in sense of total network throughput. It becomes especially significant in large networks such as Internet of Things (IoT) networks or 5G networks. One of the known NOMA techniques is DS-CDMA NOMA, which make use of non-orthogonal coding schemes to optimize capacity at multiuser networks. Equiangular Tight Frames (ETF) are known to be an optimal sequences' sets (in sense of capacity) for this technique. Unfortunately, ETFs are limited to very specific pairs of users' number and sequence lengths which put undesirable constraints on practical systems. In this paper our goal is to break those constraints by proposing alternative family of non-orthogonal sequences which on the one hand, possess similar properties to those of ETFs (for that reason we'll denote them as Almost ETFs) and on the other hand, doesn't have those limitation on users' number and sequence length. We're basing our approach by starting with known technique of building standard ETFs, and extending it by slight modifications to technique of building AETFs. In this paper we'll concentrate on bipolar (+/-1 valued) and relatively short (up to length of 100) sequences, since we're interested in sequences which will be of practical value in real systems.
