Design of the interpolation filter in an all-digital timing recovery scheme
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摘要: 介紹了全數字時鐘恢復方案中采用Farrow結構高效實現內插濾波器的設計方法.提出一種計算Farrow結構內插濾波器系數的算法,使得接收機輸出信號的均方誤差始終最小.仿真結果表明,與傳統的內插濾波器設計相比,應用本文算法的全數字同步方案提高了接收機輸出均方差和輸出信噪比的性能,并且降低了時鐘恢復方案中內插濾波器的實現復雜度.Abstract: A design method was introduced to efficiently implement an interpolator by Farrow structure, which can be used in an all-digital timing recovery scheme. An algorithm was presented to calculate the interpolator coefficients of Farrow structure and minimize the mean square error (MSE) at the output of the receiver. Simulation results show that compared with other conventional interpolation filters, the per/ormance with this optimized Farrow coefficients was improved in minimum MSE and the implementation complexity was reduced.
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Key words:
- timing recovery /
- interpolation filter /
- clock synchronization /
- low complexity
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