Successive interference cancelation-inspired channel estimation for downlink non-orthogonal multiple access,Transactions on Emerging Telecommunications Technologies

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Successive interference cancelation-inspired channel estimation for downlink non-orthogonal multiple access
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2021-05-25 , DOI: 10.1002/ett.4314
Lehlohonolo Sekokotoana ₁ , Fambirai Takawira ₁ , Olutayo Oyerinde ₁

Affiliation

This paper proposes a channel estimation (CE) scheme composed of two successive interference cancelation-inspired approaches for a two-user power domain downlink non-orthogonal multiple access system. One approach is intended for the weaker user, and the other approach is intended for the stronger user. Both CE approaches employ a constant step-size least mean squares (CSS-LMS) algorithm, using partial pilots to estimate a Rayleigh flat fading channel with a Jake's Doppler spectrum. Closed-form analytical expressions for the CE error variance are presented for each approach and the mean square error (MSE) is used as the performance metric. Through simulation, the CE performance of the stronger user and the weaker user is assessed for different probabilities of error in detection of the unknown pilot. A reasonable probability of error in detection is then selected and employed in evaluating the CE performance of both schemes against their theoretical analyses. Overall, the theoretical analysis matches the simulation results.

中文翻译：

用于下行非正交多址的连续干扰消除启发的信道估计

本文针对双用户功率域下行链路非正交多址系统提出了一种信道估计 (CE) 方案，该方案由两个连续的干扰消除启发方法组成。一种方法适用于较弱的用户，另一种方法适用于较强的用户。两种 CE 方法都采用恒定步长最小均方 (CSS-LMS) 算法，使用部分导频来估计具有 Jake 多普勒频谱的瑞利平坦衰落信道。每种方法都提供了 CE 误差方差的封闭式解析表达式，并使用均方误差 (MSE) 作为性能指标。通过仿真，针对未知导频检测中的不同错误概率，对较强用户和较弱用户的CE性能进行评估。然后选择一个合理的检测错误概率，并根据它们的理论分析评估两种方案的 CE 性能。总体而言，理论分析与仿真结果相符。

更新日期：2021-05-25

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