脉冲高斯噪声信道下零填充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
摘要：
在无线通信系统中，正交频分复用（OFDM）包括使用循环前缀（CP）或零填充（ZP）作为保护间隔以避免符号间干扰的变体。OFDM非常适合处理频率选择性信道和加性高斯白噪声（AWGN）;然而，在存在脉冲噪声的情况下，其性能可能会显著下降。虽然OFDM的ZP变体与它们的CP对应物相比表现出较低的误比特率（BER）和较高的能量效率，但是它们需要严格的时间同步，这在没有导频和CP的情况下是具有挑战性的。此外，与AWGN相反，脉冲噪声严重破坏数据。本文提出了一种新的低复杂度的ZP-OFDM定时偏移（TO）估计器，它依赖于多径衰落信道和噪声的第二-其它统计量。与现有TO估计器的性能比较表明，无论是在锁定概率方面的优异性能，还是在各种实际情况下的宽范围的信噪比（SNR）上的显着较低的复杂性。
英文摘要：
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.
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