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Training Based Channel Estimation Scheme for LTE SC-FDMA Systems Using LMS Algorithm

机译:使用LMS算法的LTE SC-FDMA系统基于训练的信道估计方案

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Long term evolution (LTE) uses orthogonal frequency division multiple access (OFDMA) scheme for the downlink and single carrier-frequency division multiple access (SC-FDMA) in uplink. Main challenges for a terminal implementation are efficient realization of the inner receiver, especially for channel estimation (CE) and equalization. In this paper, training based least mean square (LMS) CE scheme is presented for a SC-FDMA system under the umbrella of the LTE that can avoid the illconditioned least square (LS) problem. This CE scheme uses adaptive estimator which is able to update parameters of the estimator continuously, so that knowledge of channel and noise statistics are not required I.e., it does not require measurements of the relevant correlation functions, nor does it require matrix inversion. Simulation results show that the LMS CE method with 500 Hz Doppler frequency has 3 (IB better performances compared with 1500 Hz Doppler frequency.
机译:长期演进(LTE)对下行链路使用正交频分多址(OFDMA)方案,在上行链路中使用单载波频分多址(SC-FDMA)。终端实现的主要挑战是内部接收器的有效实现,尤其是对于信道估计(CE)和均衡而言。在本文中,针对LTE框架下的SC-FDMA系统,提出了一种基于训练的最小均方(LMS)CE方案,该方案可以避免病态最小平方(LS)问题。该CE方案使用能够连续更新估计器的参数的自适应估计器,从而不需要信道和噪声统计信息,即,它不需要测量相关的相关函数,也不需要矩阵求逆。仿真结果表明,与1500 Hz多普勒频率相比,具有500 Hz多普勒频率的LMS CE方法具有3(IB的性能更好)。

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