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Configurable symbol synchronizers for software-defined radio applications

机译：用于软件定义的无线电应用的可配置符号同步器

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摘要

In many synchronous receivers, symbol timing synchronization is achieved through implementation of an analog phase locked loop (PLL). A phase detector and voltage-controlled oscillator drive a reference signal to be in phase with the received training sequence. Due to the quick phase convergence this option is attractive; however, limitations in pre-packaged hardware make this approach infeasible at times. Changes in the received symbol rate in software radio applications can further complicate the hardware implementation by requiring additional control signals to alter the frequency of the reference signal. This paper examines a configurable symbol synchronizer for software-defined radio (SDR) architecture with a predefined RF front end. In this scenario, we implement a typical method for digital phase locking and make it adaptable to different data rates. A pre-synchronization step is used to provide a reasonable initial estimate for the received symbol period for lower, over-sampled data rates. This decreases the synchronization time while maintaining a constant sampling period at the ADC. It also maintains the down-conversion stage at the receiver. The paper shows the feasibility of this architecture to support wide range of symbol rates.
机译：在许多同步接收器中，符号定时同步是通过实现模拟锁相环（PLL）来实现的。鉴相器和压控振荡器驱动参考信号与接收的训练序列同相。由于快速的相位收敛，该选项很有吸引力。但是，预包装硬件的限制有时使这种方法不可行。通过要求附加的控制信号来改变参考信号的频率，软件无线电应用中接收到的符号率的变化会使硬件实现更加复杂。本文研究了具有预定义RF前端的软件定义无线电（SDR）体系结构的可配置符号同步器。在这种情况下，我们实现了一种用于数字锁相的典型方法，并使它适用于不同的数据速率。预同步步骤用于为接收到的符号周期提供合理的初始估计，以降低较低的过采样数据速率。这样可以减少同步时间，同时在ADC上保持恒定的采样周期。它还在接收机处保持下变频阶段。本文显示了该架构支持广泛的符号率的可行性。

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  • 来源
    《Journal of network and computer applications》 |2009年第3期|607-615|共9页
  • 作者

    Y. Tachwali; W.J. Barnes; H. Refai; Members IEEE;

  • 作者单位

    Electrical and Computer Engineering Department, University of Oklahoma-Tulsa Campus, 4502 E. 41st Street, Tulsa, OK 74135 USA;

    Electrical and Computer Engineering Department, University of Oklahoma-Tulsa Campus, 4502 E. 41st Street, Tulsa, OK 74135 USA;

    Electrical and Computer Engineering Department, University of Oklahoma-Tulsa Campus, 4502 E. 41st Street, Tulsa, OK 74135 USA;

    Electrical and Computer Engineering Department, University of Oklahoma-Tulsa Campus, 4502 E. 41st Street, Tulsa, OK 74135 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    configurable; symbol timing recovery; synchronization; SDR;

    机译：可配置的符号定时恢复;同步特别提款权;

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