利用自相关和过零检测进行盲码率估计

M. Elgenedy, A. Elezabi
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引用次数: 13

摘要

本文介绍了一种新的、简单的估计未知调制单载波系统符号率的方法。所介绍的技术从一个连续的符号速率范围检测符号速率,即它不假设一个有限的候选符号速率集。该方法不需要任何关于系统参数的知识,因此是完全盲的。该方法属于基于自相关的符号率估计方法,然而,与许多此类方案不同的是,它的性能对滚转因子的值不敏感。然后,我们提出了一种简单的基于自相关函数的频率偏移补偿方法。所提出的估计器作为完整DVB-C[1]接收机的一部分实现,并通过仿真验证,即使在低信噪比和高频率偏移下也具有稳健的性能。
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Blind symbol rate estimation using autocorrelation and zero crossing detection
In this paper we introduce a new and simple method to estimate the symbol rate for single carrier systems of unknown modulation. The introduced technique detects the symbol rate from a continuous range of symbol rates, i.e. it does not assume a finite set of candidate symbol rates. The method does not require any knowledge about system parameters and is therefore totally blind. The method belongs to the family of autocorrelation-based symbol rate estimators, yet, unlike many such schemes, its performance is insensitive to the value of the roll-off factor. We then propose a simple method for frequency offset compensation also based on the autocorrelation function. The proposed estimator is implemented as part of a complete DVB-C [1] receiver and is verified using simulations and results in robust performance even at low SNR and high frequency offsets.
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