Envelope shaping in envelope tracking power amplification
A technology of power amplification and envelope tracking, which is applied in the direction of power amplifiers, components of amplification devices, amplifiers, etc., can solve problems affecting the efficiency and linearity of ETPA systems, unpredictability, and sudden drop in gain, and achieve system performance and linearity Acceleration improvement, efficiency improvement, good signal quality effect
Active Publication Date: 2017-09-26
MICROSOFT TECH LICENSING LLC
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Problems solved by technology
However, when the PA power momentarily changes from low to high dynamically, the operating condition of the PA on the drain side changes drastically accordingly, and vice versa
Such significant changes in the operating point of the power amplifier induce unwanted distortion and memory effects, which can lead to gain dips and unpredictable and uncorrectable distortion, and adversely affect the efficiency and linearity of ET PA systems
Method used
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[0019] The subject matter described herein will now be described with reference to a number of example embodiments. It should be understood that these embodiments are described only to enable those skilled in the art to better understand and realize the subject matter described herein, and are not intended to limit the scope of the subject matter described herein in any way.
[0020] As used herein, the term "comprising" and variations thereof should be read as open-ended terms meaning "including but not limited to". The term "or" is to be read as "and / or" unless the context clearly indicates otherwise. The term "based on" should be read as "based at least in part on". The terms "one embodiment" and "an embodiment" should be read as "at least one embodiment"; the term "another embodiment" should be read as "at least one further embodiment". Other explicit and implicit definitions will be included in the description below.
[0021] figure 1 A block diagram of an electronic ...
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The subject matter described herein relates to envelope shaping in envelope tracking power amplification. A method, apparatus and computer storage medium are provided for envelope shaping in envelope tracking power amplification. In an embodiment, the method comprises performing an envelope shaping operation on reference envelope signals in a time domain to obtain shaped envelope signals; performing a signal quality control on the shaped envelope signals in a frequency domain; and converting the shaped envelope signals from the frequency domain into the time domain to obtain resulting shaped envelope signals. In such a way, a better signal quality can be provided without any modifications to the receiver side. And in turn, the PAPR of the envelope signal may be reduced before entering into a supply modulator and the efficiency of the ET supply modulator could be improved. As a result, the ET PA system performance can be enhanced.
Description
Background technique [0001] The efficiency of a radio frequency (RF) power amplifier (PA) is generally defined as the ratio between the desired transmitted radio power and the total power coming from the power supply. However, in emerging broadband applications and beyond, this ratio will appear considerably lower if legacy architectures are still used. For the purpose of improving efficiency, the technique of envelope tracking (ET) has been proposed and utilized in the wireless communication industry, especially in user equipments and base stations. The ET technique refers to a method of RF amplifier design in which the supply voltage applied to the power amplifier is continuously adjusted to ensure that the amplifier operates at peak efficiency for the power required for each transmission instant. Furthermore, ET technology has been considered as the most promising efficiency-enhancing scheme for fourth-generation (4G) and beyond wireless communications. [0002] Currently...
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Login to View More IPC IPC(8): H03F1/02H03F3/24
CPCH03F1/0227H03F3/24H03F2200/102H03F2200/451H04L27/26265H03F1/0222H04L25/03343H04L25/03834H04L27/0008H04L27/2615
Inventor ็ๅ ไป
Owner MICROSOFT TECH LICENSING LLC