| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| 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.
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