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Iterative based time domain equalization method for OFDM signal under high mobile environments

机译:高移动环境下OFDM信号的基于迭代的时域均衡方法

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A loss of subcarrier orthogonality in orthogonal frequency division multiplexing (OFDM) signal due to time-varying multipath fading channel causes an inter-carrier interference (ICI) which would lead fatal degradation of bit error rate (BER) performance. To solve this problem, this paper proposes a high accuracy time domain channel impulse response (CIR) estimation method and a time domain equalization (TDE) method of using estimated CIR at every sampling time in conjunction with a low-complexity iterative method instead of using an inverse matrix calculation. The salient feature of proposed method is to employ a time-domain training sequence (TS) for the estimation of CIR at every sampling time and low-complexity iterative method for solving the simultaneous equations which are required in the TDE method. This paper presents various simulation results to demonstrate the effectiveness of proposed TDE method as comparing with the conventional frequency domain equalization (FDE) method.
机译:由于时变多径衰落信道而导致的正交频分复用(OFDM)信号中子载波正交性的损失会导致载波间干扰(ICI),这将导致误码率(BER)性能的致命下降。为了解决这个问题,本文提出了一种高精度时域信道冲激响应(CIR)估计方法和一种时域均衡(TDE)方法,该方法在每个采样时间使用估计的CIR结合低复杂度迭代方法,而不是使用逆矩阵计算。所提出方法的显着特征是采用时域训练序列(TS)估算每个采样时间的CIR,并采用低复杂度迭代法求解TDE方法中所需的联立方程。本文提供了各种仿真结果,以证明与传统的频域均衡(FDE)方法相比,所提出的TDE方法的有效性。

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