| We have developed very broadband predistortion linearisers for traveling wave tube amplifiers. |
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| By minimizing memory effects, it is possible to use simple linearizers, such as analog predistortion, and still achieve sufficient performance, according to this book. |
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| However the challenge remains to estimate the predistortion function in order to fully linearize the amplifier. |
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| We have realized several neural networks architectures which can realize real time tasks like identification, predistortion and equalization. |
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| Although a baseband predistorter implementation is preferable, a circuit to apply the predistortion at IF or RF can be designed. |
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| To solve those problems, two solutions are available: equalization and predistortion. |
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| The predistortion function is the inverse of the field distortion function for the optics, so that the virtual image seen by the eye matches the image in the virtual screen buffer. |
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| Figure 10 APSK constellation with predistortion. Figure 11 APSK constellation without predistortion. |
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| Figure 12 Windowed spectrum after phase predistortion. |
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| The concept of the predistortion has been introduced. |
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| The difference between the statistics at the input and output of the amplifier contains the information necessary to derive the predistortion function. |
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| To solve this problem, predistortion techniques have been put forward. |
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| Figure 11 Spectrum after phase predistortion. |
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