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Type-Based Group Delay Equalizer Considering the Nonlinear Phase Distortion of HPA
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 Title & Authors
Type-Based Group Delay Equalizer Considering the Nonlinear Phase Distortion of HPA
Kim, Yongguk; Jo, Byung Gak; Baek, Gwang Hoon; Ryu, Heung-Gyoon;
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In this paper, we propose a novel equalizer to compensate for the group delay including AM/PM nonlinear distortion characteristics by the nonlinear power amplifier (PA). The group delay characteristic is a nonlinear non-constant time delay that appears differently depending on each frequency component. The phase distortion by AM/PM characteristics arising from the power amplifier is a major factor to increase group delay. By the group delay distortion, the signal in the constellation expands and is rotated. Considering the problem mentioned above, the nonlinear time delay that appears differently depending on each frequency component is classified as a static group delay and AM/PM characteristic of PA, the different phase transitions depending on the size of input signal as a dynamic group delay. Static group delay estimates and compensate for phase distortions in the frequency domain with type-based method and dynamic group delay compensates for phase rotation in the time domain. We confirmed that the group delay compensation techniques were enough to compensate the group delay characteristics including AM/PM characteristics of the power amplifier.
static group delay;dynamic group delay;equalizer;AM/PM;
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