Optimal Variable-Phase Filter Design and High-Accuracy Channel-Phase Compensation

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560479
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Communication/Network engineering
• Research Institution: Toho University
• Principal Investigator: ITO Noboru 東邦大学, 理学部, 教授 (00237041)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 線形位相 / 非線形位相 / 位相回路

Outline of Final Research Achievements

In digital communications, a nonlinear-phase communication-channel will distort the waveform of a transmitted signal, which is not allowed. To keep the waveform undistorted after signal transmission, it is necessary to compensate the nonlinear-phase by using a digital phase-circuit (phase filter) such that the whole phase response of the compensated communication channel is nearly linear. In this research, various mathematical-programming techniques are utilized to formulate different types of optimal methods for designing an all-pass phase filter so as to approximate a given desired phase accurately. In the variable-phase case, each coefficient of the variable all-pass phase filter is expressed as a polynomial in the phase parameter that tunes the phase response, and then the optimal coefficients of all the polynomials are determined through applying an optimization solver. As a result, the phase response of the designed phase filter can be tuned online for practical applications.

Free Research Field

信号処理