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Signal processing apparatus and method for amplitude modulation to amplitude modulation pre-compensation

A signal processing device and pre-compensation technology, which is applied to the device dedicated to the transmitter, the parts of the amplifier device, and the transmission modification based on the link quality, etc., which can solve the problems such as the large influence of the low power state

Inactive Publication Date: 2017-10-27
MSTAR SEMICON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, quantization effects have a greater impact on low-power states

Method used

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  • Signal processing apparatus and method for amplitude modulation to amplitude modulation pre-compensation
  • Signal processing apparatus and method for amplitude modulation to amplitude modulation pre-compensation
  • Signal processing apparatus and method for amplitude modulation to amplitude modulation pre-compensation

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Embodiment Construction

[0013] The following embodiments and related drawings can fully illustrate the inventive concepts of the present application. Like component numbers in the various figures correspond to similar functions or components. It should be noted that the word "invention" here is used to refer to the inventive concepts presented in these embodiments, but its scope is not limited to the embodiments themselves. In addition, the mathematical expressions in this disclosure are used to illustrate the principles and logics related to the embodiments of the present invention, and do not limit the scope of the present invention unless otherwise specified. Those with ordinary knowledge in the technical field of the present invention can understand that there are a variety of technologies to realize the physical representations corresponding to these mathematical formulas.

[0014] figure 1 is a functional block diagram of the digital transmitter 100 . The digital transmitter 100 is used to m...

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Abstract

Pairs of input in-phase and quadrature data words are provided as arguments to a pre-distortion function to generate computed in-phase and quadrature data. Additionally, by comparing the input data word with a full amplitude value, additional in-phase and quadrature data words are generated. When the input data word has the full magnitude, the digital power amplifier generates a maximum current. The additional in-phase and quadrature data words and the post-operation in-phase and quadrature data words are added to produce the pre-distorted in-phase and quadrature data words. The pre-compensated in-phase and quadrature data words are provided to the digital power amplifier to generate a corresponding RF analog signal.

Description

technical field [0001] The present invention is related to predistortion in digital modulators. Background technique [0002] Amplitude modulation to amplitude modulation (AMAM) distortion is a third-order intermodulation distortion (intermodulation distortion, IMD), which will cause the amplitude of the output signal to be compressed or expanded, which is caused by the digital power amplifier or RF power amplifier. Current amplitude changes. Highly linear amplifiers with minimal distortion are especially useful when signal quality is more important than cost. However, highly linear amplifiers consume considerable power and are relatively expensive, so they are rarely used in cost-conscious wireless devices. [0003] In order to strike a balance between efficiency, linearity and cost, the digital power amplifier can be designed to have a known nonlinearity, and then use pre-compensation to eliminate this nonlinearity, so that the output signal is linearized. That is to sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03
CPCH03F1/3241H04L27/367H03F2200/336H03F2201/3233H04L1/0033
Inventor 丹尼斯·马欧尼胡拉姆·穆罕默德
Owner MSTAR SEMICON INC