Error Vector Magnitude to SNR Conversion for Nondata-Aided Receivers
Error Vector Magnitude to SNR Conversion for Nondata-Aided Receivers
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DOI：
10.1109/twc.2009.080862
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发表时间：
2009-05-01
影响因子：
10.4
通讯作者：
Arslan, Hueseyin
中科院分区：
文献类型：
--
作者：
Mahmoud, Hisham A.;Arslan, Hueseyin
误差向量值(EVM)是被广泛接受的用于评估通信系统质量的优值之一。在文献中，EVM与数据辅助接收机的信噪比(SNR)有关，在数据辅助接收机中，使用前导序列或导频来测量EVM，或者在高信噪比的假设下。在本文中，我们研究了非数据辅助接收器的这种关系，结果表明，这种关系的性能很差，特别是在低信噪比或高调制阶数的情况下。然后评估非数据辅助接收器的EVM，其值与加性白高斯噪声(AWGN)信道和瑞利衰落信道上的正交幅度调制(QAM)和脉冲幅度调制(PAM)信号的SNR以及具有IQ不平衡的系统的SNR有关。结果表明，推导出的公式可以利用基于检测到的数据符号的EVM测量来可靠地估计SNR值，因此，本文的工作对于诸如矢量信号分析仪(VSA)这样的测量设备非常有用，因为EVM测量是容易获得的。
Error vector magnitude (EVM) is one of the widely accepted figure of merits used to evaluate the quality of communication systems. In the Literature, EVM has been related to signal-to-noise ratio (SNR) for data-aided receivers, where preamble sequences or pilots are used to measure the EVM, or under the assumption of high SNR values. In this paper, this relation is examined for nondata-aided receivers and is shown to perform poorly, especially for low SNR values or high modulation orders. The EVM for nondata-aided receivers is then evaluated and its value is related to the SNR for quadrature amplitude modulation (QAM) and pulse amplitude modulation (PAM) signals over additive white Gaussian noise (AWGN) channels and Rayleigh fading channels, and for systems with IQ imbalances. The results show that derived equations can be used to reliably estimate SNR values using EVM measurements that are made based on detected data symbols., Thus, presented work can be quite useful for measurement devices such as vector signal analyzers (VSA), where EVM measurements are readily available.