Shared digital predistortion system and method for multiple-input multiple-output transmitter
A digital pre-distortion and multi-output technology, which is applied in transmission systems, improved amplifiers to reduce nonlinear distortion, parts of amplifiers, etc., can solve problems such as unsuitability, large power amplifiers, high hardware costs and power consumption, and achieve cost reduction effect
Active Publication Date: 2019-11-12
SOUTHEAST UNIV
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Problems solved by technology
However, the traditional digital pre-distortion technology is aimed at a single power amplifier, and the number of amplifiers in the large-scale multi-input and output system is very large. If each link uses a digital pre-distortion device to separate linear The hardware cost and power consumption will be particularly high
Therefore, traditional digital predistortion technology is not suitable for large-scale multiple input output system
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[0040] The technical solution of the present invention will be further introduced below in combination with specific implementation methods and accompanying drawings.
[0041] This specific embodiment discloses a shared digital predistortion system for multiple-input multiple-output transmitters, such as figure 1 As shown, including the shared digital pre-distortion module, the input signal passes through the shared digital pre-distortion module to generate a pre-distortion signal, the pre-distortion signal passes through a power amplifier to generate an output signal, and both the pre-distortion signal and the output signal are sent to the coefficient extraction module and tolerance calculation module, the coefficient extraction module calculates the coefficient of the digital predistorter corresponding to each power amplifier, the tolerance calculation module calculates the coefficient tolerance of each power amplifier, and sends the coefficient tolerance of all power amplifi...
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The invention discloses a shared digital predistortion system for a multi-input multi-output transmitter, including shared digital predistortion modules, the input signal passes through a shared digital predistortion module to generate a predistorted signal, the predistorted signal generates an output signal through a power amplifier, the predistorted signal and the output signal are both sent into a coefficient extraction module and a tolerance calculation module, the coefficient extracting module calculates the coefficients of the digital predistorter corresponding to each power amplifier, the tolerance calculation module calculates the coefficient tolerance of each power amplifier, sends the coefficient tolerance of all power amplifiers to the number decision module of shared digital predistorters, calculates the number of shared digital predistorters, and updates the shared digital predistorters according to the number of shared digital predistorters. The invention also discloses ashared digital predistortion method for a multi-input multi-output transmitter. The present invention enables linearization of power amplifiers in all channels at low cost.
Description
technical field [0001] The invention relates to the technical field of digital pre-distortion, in particular to a shared digital pre-distortion system and method for multiple-input multiple-output transmitters. Background technique [0002] In the upcoming era of fifth-generation mobile communications (5G), massive multiple-input multiple-output systems will play an important role in achieving high-speed data transmission. These systems are often composed of many links, and each link has its own power amplifier and antenna unit. Like the traditional mobile communication system, in order to ensure the working efficiency of the system, the power amplifier usually works in the nonlinear region, and the resulting in-band distortion and spectrum expansion will seriously affect the communication quality. [0003] Digital predistortion technology, with its advantages of low cost and high precision, has been widely used in the linearization of power amplifiers. However, the tradit...
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IPC IPC(8): H04B1/04H03F1/32
CPCH03F1/3241H04B1/04H04B1/0483H04B2001/0425
Inventor 余超景建新严蘋蘋
Owner SOUTHEAST UNIV