Non-Pilot-Aided Phase Estimator for 2-Source BPSK NOMA Channel with Closed-Form Solver

J. Sýkora
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Abstract

In this paper, we focus on developing the non-pilot-aided phase CSE (Channel State Estimator) for 2-source BPSK generic NOMA (Non-Orthogonal Multiple Access) scenario. Apart of the exact CSE form, we develop also the low-SNR approximation which allows us to find a closed-form ML (Maximum Likelihood) solver. Both, exact and low-SNR (Signal to Noise Ratio) forms will be analyzed in terms of their fundamental mean-square error performance limits. We will use classical and mismatched model Cramer-Rao Lower Bound (CRLB) analysis. The numerical analysis shows that the mismatched low-SNR model CRLB nicely pairs the true estimator performance for low and medium SNRs.
2源BPSK NOMA信道的非导频辅助相位估计与封闭解算器
在本文中,我们重点研究了针对2源BPSK通用NOMA(非正交多址)场景的非导频辅助相位CSE(信道状态估计器)。除了精确的CSE形式,我们还开发了低信噪比近似,这使我们能够找到一个封闭形式的ML(最大似然)求解器。精确和低信噪比(信噪比)形式将根据其基本均方误差性能限制进行分析。我们将使用经典和错配模型Cramer-Rao下界(CRLB)分析。数值分析表明,在低信噪比和中信噪比情况下,错匹配的低信噪比模型CRLB能很好地匹配真实估计器的性能。
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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