Exploiting non‐orthogonal multiple access in downlink coordinated multipoint transmission with the presence of imperfect channel state information,International Journal of Communication Systems

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Exploiting non‐orthogonal multiple access in downlink coordinated multipoint transmission with the presence of imperfect channel state information
International Journal of Communication Systems ( IF 1.7 ) Pub Date : 2020-07-14 , DOI: 10.1002/dac.4533
Fahri Wisnu Murti _{1,

2} , Rahmat Faddli Siregar _{1,

2} , Muhammad Royyan _{2,

3} , Soo Young Shin ₂

Affiliation

In this paper, the impact of imperfect channel state information (CSI) on a downlink coordinated multipoint (CoMP) transmission system with non‐orthogonal multiple access (NOMA) is investigated since perfect knowledge of a channel cannot be guaranteed in practice. Furthermore, the channel estimation error is applied to estimate the channel information wherein its a priori of variance is assumed to be known. The impact of the number of coordinated base stations (BSs) on downlink CoMP NOMA is investigated. Users are classified into one of two groups according to their position within the cell, namely, cell‐center user (CCU) and cell‐edge user (CEU). In this paper, ergodic capacity and sum capacity for both CCU and CEU are derived as closed forms. In addition, various experiments are conducted with different parameters such as SNR, error variance, and power allocation to show their impact on the CoMP method. The results show that CoMP NOMA outperforms the CoMP orthogonal multiple access (OMA) wherein the condition of the channel impacts the performance of CoMP NOMA less. It is worth noting that a higher number of coordinated BSs enhances the total capacity of CoMP NOMA. Finally, the performance analysis is validated due to the close accordance between the analytical and simulation results.

中文翻译：

存在不完善信道状态信息的下行协作多点传输中的非正交多路访问

在本文中，研究了不完善的信道状态信息（CSI）对具有非正交多址（NOMA）的下行链路多点协作（CoMP）传输系统的影响，因为实际上不能保证对信道的完全了解。此外，将信道估计误差应用于估计其信息的先验先验已知的信道信息。研究了协作基站（BS）数量对下行CoMP NOMA的影响。根据用户在小区中的位置，它们被分为两组之一，即小区中心用户（CCU）和小区边缘用户（CEU）。在本文中，CCU和CEU的遍历容量和总容量以封闭形式导出。此外，还使用不同的参数（例如SNR，误差方差，和功率分配，以显示它们对CoMP方法的影响。结果表明，CoMP NOMA优于CoMP正交多路访问（OMA），其中信道条件对CoMP NOMA性能的影响较小。值得注意的是，更多的协调BS可以增强CoMP NOMA的总容量。最后，由于分析结果与仿真结果之间的紧密一致性，对性能分析进行了验证。

更新日期：2020-07-14

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