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.

翻译：非正统多重存取( NOMA) 是一个在多用户网络中获得极大支持的概念, 因为它在网络总吞吐量方面的优势。 它在诸如Things( IoT) 网络或 5G 网络的互联网等大型网络中变得特别重要。 已知的NOMA 技术之一是 DS- CDMA NOMA 技术之一, 它利用非正统的编码方法优化多用户网络的能力。 已知, Qeagronight 框架( ETF) 是这一技术的最佳序列( 能力感知 ) 。 不幸的是, ETF 仅限于非常具体的用户数量和序列长度, 从而给实际系统造成不应有的限制。 在本文中, 我们的目标是打破这些限制, 提出非正统序列的替代式组合, 一方面, 它具有与 ETF 的类似特性( 因为这样, 我们把它们称为几乎 ETF ), 而在另一方面, 用户数量和顺序的长度上没有这些限制。 不幸的是, 我们的用户数量和顺序限制。