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首页> 外文会议>2010 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB 2010) >An investigation into the properties of the ML-NVE in asynchronous OFDM systems
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An investigation into the properties of the ML-NVE in asynchronous OFDM systems

机译：异步OFDM系统中ML-NVE的特性研究

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摘要

Orthogonal frequency division multiplexing (OFDM) systems require the knowledge of signal-to-noise ratio (SNR) at receiver in order to maximize system performance. In general, SNR can be estimated with the help of noise variance. The existing literatures mostly assume that noise variance is estimated in the case of that channel status information (CSI) is known in advance and synchronization is perfectly achieved. However, CSI generally cannot be obtained in advance and perfect synchronization is impossible in reality. This paper derives the statistical property (including mean, variance, and MSE) of maximum likelihood noise variance estimator (ML-NVE) in an asynchronous OFDM system with estimated channel. And moreover, simulation results are presented to substantiate the derivations.
机译：正交频分复用（OFDM）系统需要了解接收机处的信噪比（SNR），以使系统性能最大化。通常，可以借助噪声方差来估算SNR。现有文献大多假设在预先知道信道状态信息（CSI）并且完美实现同步的情况下估计噪声方差。但是，通常不能预先获得CSI，并且实际上不可能实现完美的同步。本文推导了具有估计信道的异步OFDM系统中最大似然噪声方差估计器（ML-NVE）的统计属性（包括均值，方差和MSE）。此外，给出了仿真结果以证实推导。

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