Abstract
Radio-Frequency Power Amplifiers are the most power-consuming component ofany wireless base station. As a result, even the slightest increase in efficiency
has a very high impact on lessening a base station’s consumption. One of
several possible ways to achieve increased performance is to modulate the
Power Amplifier’s supply voltage in function of the signal’s input envelope. Such a feat is made possible by co-operation of the Power Amplifier and a, newly introduced, Dynamic Power Supply. In such an arrangement, maximum
performance is only achieved when both components are perfectly matched to
each other. However, an immediate problem is that this internal interface, and
the exact matching as a result, is not observable by the designer.
Classically, these baseband dynamics, as presented at this internal interface,
are assumed to solely consist of a linear delay and are consequently treated as
such. This has led to the introduction of several time alignment techniques that aim to minimize the negative impact of these dynamics on the total
transmitter's performance metrics. These techniques achieve better
performance, but only up to a certain point. For example, non-linear delays nor dynamic ripples can be captured and compensated by these techniques.
In this thesis, an analysis technique for approximating and modeling the signals at this internal interface, and the baseband dynamics as a result, is introduced. Such a technique makes heavy use of the already existing linear parametervarying framework and molds this theoretical technique to the practical properties of a Supply-Modulated Transmitter. The approximated baseband dynamics are then use a precompensation template for increasing the device’s performance beyond what is achievable with a simple time alignment technique.
Furthermore, both the static and dynamic dependency of these dynamics are
analyzed in function of the transmitter’s average input power, among others.
has a very high impact on lessening a base station’s consumption. One of
several possible ways to achieve increased performance is to modulate the
Power Amplifier’s supply voltage in function of the signal’s input envelope. Such a feat is made possible by co-operation of the Power Amplifier and a, newly introduced, Dynamic Power Supply. In such an arrangement, maximum
performance is only achieved when both components are perfectly matched to
each other. However, an immediate problem is that this internal interface, and
the exact matching as a result, is not observable by the designer.
Classically, these baseband dynamics, as presented at this internal interface,
are assumed to solely consist of a linear delay and are consequently treated as
such. This has led to the introduction of several time alignment techniques that aim to minimize the negative impact of these dynamics on the total
transmitter's performance metrics. These techniques achieve better
performance, but only up to a certain point. For example, non-linear delays nor dynamic ripples can be captured and compensated by these techniques.
In this thesis, an analysis technique for approximating and modeling the signals at this internal interface, and the baseband dynamics as a result, is introduced. Such a technique makes heavy use of the already existing linear parametervarying framework and molds this theoretical technique to the practical properties of a Supply-Modulated Transmitter. The approximated baseband dynamics are then use a precompensation template for increasing the device’s performance beyond what is achievable with a simple time alignment technique.
Furthermore, both the static and dynamic dependency of these dynamics are
analyzed in function of the transmitter’s average input power, among others.
| Original language | English |
|---|---|
| Qualification | Doctor of Engineering Sciences |
| Awarding Institution |
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| Supervisors/Advisors |
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| Award date | 6 Sep 2021 |
| Place of Publication | Brussels |
| Publication status | Published - 2021 |