论文标题
具有冲动性高斯噪声的通道中零填充ofdm的近似最大似然时间同步算法
An Approximate Maximum Likelihood Time Synchronization Algorithm for Zero-padded OFDM in Channels with Impulsive Gaussian Noise
论文作者
论文摘要
在无线通信系统中，正交频划分多路复用（OFDM）包括使用环状前缀（CP）或零填充（ZP）作为后卫间隔的变体，以避免隔离间干扰。 OFDM非常适合处理频率选择通道和添加剂白色高斯噪声（AWGN）；但是，在存在冲动噪声的情况下，其性能可能会大大退化。与CP同步相比，OFDM的ZP变体显示出较低的位错误率（BER）和更高的能源效率，但它们要求严格的时间同步，这在没有试点和CP的情况下具有挑战性。而且，与AWGN相反，冲动噪声严重损坏了数据。在本文中，提出了用于实用冲动 - 噪声环境的ZP-OFDM的新的低复杂性偏移量（TO），其中依赖于多路径褪色通道和噪声的第二个统计数据。与现有与估计量的性能比较表明，在各种实际情况下，在宽范围的信噪比（SNR）中，在锁定概率方面表现出色，或者在广泛的信噪比（SNR）上的复杂性较低。
In wireless communication systems, Orthogonal Frequency-Division Multiplexing (OFDM) includes variants using either a cyclic prefix (CP) or a zero padding (ZP) as the guard interval to avoid inter-symbol interference. OFDM is ideally suited to deal with frequency-selective channels and additive white Gaussian noise (AWGN); however, its performance may be dramatically degraded in the presence of impulse noise. While the ZP variants of OFDM exhibit lower bit error rate (BER)and higher energy efficiency compared to their CP counterparts,they demand strict time synchronization, which is challenging in the absence of pilot and CP. Moreover, on the contrary to AWGN, impulse noise severely corrupts data. In this paper, a new low-complexity timing offset (TO) estimator for ZP-OFDM for practical impulsive-noise environments is proposed, where relies on the second-other statistics of the multipath fading channel and noise. Performance comparison with existing TO estimators demonstrates either a superior performance in terms of lock-in probability or a significantly lower complexity over a wide range of signal-to-noise ratio (SNR) for various practical scenarios.
