An effective approach for parameter determination of the digital phase-locked loop in the z-domain
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- 作者：Yunhua Lia ; b ; yunhuali0816@126.com" class="auth_mail" title="E-mail the corresponding authorAuthor Vitae ; Bin Tiana ; b ; btian@xidian.edu.cn" class="auth_mail" title="E-mail the corresponding authorAuthor Vitae ; Kechu Yia ; kchyi@mail.xidian.edu.cn" class="auth_mail" title="E-mail the corresponding authorAuthor Vitae ; Quan Yua ; c ; yuquan@public3.bta.net.cn" class="auth_mail" title="E-mail the corresponding authorAuthor Vitae
- 关键词：Digital phase-locked loop (DPLL) ; Loop parameters ; Carrier phase recovery ; z-Domain ; Bilinear transformation algorithm
- 刊名：Digital Signal Processing
- 出版年：2016
- 出版时间：July 2016
- 年：2016
- 卷：54
- 期：Complete
- 页码：87-94
- 全文大小：671 K
文摘
In digital communication systems, typical methodologies in determining loop parameters of the digital phase-locked loop (DPLL) are based on the mapping transformation from the analog domain to the digital domain. However, such transform based algorithms are relatively complicated and not straightforward, and they also cause the problem that loop parameters are affected by the pre-detection integration time greatly. To solve these issues, an effective direct method of determining loop parameters of the second-order DPLL in the z-domain is proposed in this paper. Through ascertaining specific positions of the closed-loop system function's poles inside the right-hand side of the z-plane's unit circle, unknown parameters are calculated directly and flexibly in this method, which enables the DPLL to acquire good low-pass filtering characteristic and system stability. This novel method not only reduces the complexity of solving the parameters, but also eliminates the effect of the pre-detection integration time on loop parameters. Simulation results are provided to confirm the feasibility of the proposed method and to show that the DPLL obtained by this method achieves the similar tracking performance to the discretized PLL.