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Sparse multi-user detection for non-orthogonal multiple access in 5G systems

机译:5G系统中非正交多路访问的稀疏多用户检测

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A key technology in the 5th generation (5G) wireless communications is non-orthogonal multiple access (NOMA) which can effectively support massive random access. Since in a 5G system the number of active users generally does not exceed 10% of the total number of users in practice, the main challenge for multi-user detection (MUD) is the joint detection of sparse active users and their data. To address this challenge, we propose a novel compressed sensing based NOMA (CS-NOMA) scheme which can be deployed in a CDMA or an OFDM system and does not have control signaling overhead and need no knowledge of the active state of users. In the proposed scheme, K users are multiplexed over N shared resources (K ≫ N). Then, a CS-based MUD is applied to the proposed CS-NOMA scheme. Simulation results show that, in the case that active users are sparse (e.g., 10%), the proposed scheme can achieve a superior performance even when the system loading is up to 300%.
机译:第五代(5G)无线通信中的一项关键技术是非正交多路访问(NOMA),它可以有效地支持大规模随机访问。由于在5G系统中,实际活动用户的数量通常不超过实际用户总数的10%,因此多用户检测(MUD)的主要挑战是联合检测稀疏活动用户及其数据。为了解决这一挑战,我们提出了一种新颖的基于压缩感知的NOMA(CS-NOMA)方案,该方案可以部署在CDMA或OFDM系统中,并且不具有控制信令开销,并且不需要了解用户的活动状态。在提出的方案中,K个用户在N个共享资源(K≫ N)上进行了多路复用。然后,将基于CS的MUD应用于建议的CS-NOMA方案。仿真结果表明,在活动用户稀疏的情况下(例如10%),即使系统负载达到300%,该方案也可以实现较高的性能。

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