Adaptive Receiver for MCM Based NOMA in Doubly Selective Channels

Nour El Houda Bouda, S. Elahmar, I. Dayoub
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Abstract

Non-orthogonal multiple access (NOMA) has been identified as a potential fundamental shift for the design of multiple access systems. Over a high Doubly Selective (DS) channel scenario, this paper considers the use of NOMA system based on Multi-Carrier Modulation (MCM) with various waveforms, with Orthogonal Frequency Division Multiplexing (OFDM) and Filter Bank Multicarrier Modulation (FBMC) as special cases. Furthermore, we investigate the Imperfect Successive Interference Cancellation (I-SIC). NOMA users are affected by intra-user interference and inter-user interference in this situation. To this end, an adaptive receiver scheme that combines one-tap equalization and a joint iterative interference cancellation, proposed in literature, is introduced. The receiver selects the appropriate data detection mechanism based on the power allocation factor and hence the channel constraints. The One-Tap equalizer is so useful in practice. Unfortunately, once the DS channel and NOMA induced interference begin to dominate the noise, a one-tap equalization under-performs. On the other hand, by using the joint iterative interference cancellation approach, performance will be greatly improved at the cost of computational complexity. Moreover, numerical simulations are carried out to illustrate the efficacy of the suggested combined strategy in contrast to the theoretical Perfect-SIC (PSIC) condition.
双选择信道中基于MCM的NOMA自适应接收机
非正交多址(NOMA)已被确定为多址系统设计的潜在根本转变。在高双选择性(DS)信道场景下,以正交频分复用(OFDM)和滤波器组多载波调制(FBMC)为例,研究了基于各种波形的多载波调制(MCM)的NOMA系统的使用。此外,我们还研究了不完全连续干扰抵消(I-SIC)。在这种情况下,NOMA用户受到用户内干扰和用户间干扰的影响。为此,介绍了文献中提出的一抽头均衡和联合迭代干扰抵消相结合的自适应接收机方案。接收机根据功率分配因子和信道约束选择适当的数据检测机制。一键均衡器在实践中非常有用。不幸的是,一旦DS通道和NOMA诱导的干扰开始主导噪声,一分接均衡就会表现不佳。另一方面,采用联合迭代干扰抵消方法,将大大提高性能,但代价是计算量的增加。此外,通过数值模拟验证了该组合策略的有效性,并与理论的完美sic (PSIC)条件进行了对比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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