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Digital pre-distortion structure for beam forming system, and control method thereof

A technology of digital predistortion and beamforming, which is applied in transmission systems, baseband system components, radio transmission systems, etc., can solve problems such as uncorrectable, poor linearization performance of predistortion, etc., to reduce computing energy consumption, improve Linear performance, effect of simplified transmitter structure

Active Publication Date: 2018-01-09
TSINGHUA UNIV
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Problems solved by technology

Since the linearization object of this scheme is all the power amplifiers in the sub-array, when the nonlinear characteristics of the power amplifiers in the sub-array are greatly different, the linearization performance of the pre-distortion of the scheme will be deteriorated, or even uncorrectable

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  • Digital pre-distortion structure for beam forming system, and control method thereof
  • Digital pre-distortion structure for beam forming system, and control method thereof
  • Digital pre-distortion structure for beam forming system, and control method thereof

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Embodiment Construction

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0044] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element refe...

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Abstract

The invention provides a digital pre-distortion structure for a beam forming system, and a control method thereof. The control method comprises the following steps: transmitting an input original signal x(n) via an antenna array after processing the original signal via a predistorter, a DAC, an up-conversion module, a phase shifter and a power amplifier; collecting an output signal yp(n) of each power amplifier by a feedback channel in a time sharing manner; synthesizing an equivalent far field signal y(n) of a main beam direction by using a beam forming algorithm according to yp(n); performing DPD training by using an indirect learning structure or a direct learning structure depending on the y(n) and the x(n), and updating the coefficients of the predistorter; and inputting the generatedDPD signal in the system, transmitting the signal via a transmitting channel, and using the transmitted signal as a linear signal of the main beam direction. The digital pre-distortion structure provided by the invention can greatly simplify the transmitter structure, reduce the computing energy consumption, achieves the linearization of the signal of the main beam direction, and can achieve verygood nonlinear performance when the difference of the nonlinear characteristics of each power amplifier is relatively large.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a digital predistortion structure oriented to a beamforming system and a control method thereof. Background technique [0002] With the advancement of communication technology, 5G, as the fifth-generation wireless mobile communication network, has launched key research and development around the world and will gradually replace 4G networks. In 5G communication systems, Massive MIMO (Massive MIMO) technology will be widely used. The concept of massive MIMO technology was proposed by Tomas L.Marzetta of Bell Labs in 2010. It refers to increasing the number of antennas configured in the base station to tens or even hundreds of antennas on the basis of traditional MIMO technology to ensure that the number of antennas in the base station is greater than The number of mobile station users in the cell enables the same time-frequency resource to serve multiple users through...

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Application Information

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IPC IPC(8): H04L25/03H04B1/04H04B7/0413H04B7/06
CPCY02D30/70
Inventor 张千陈文华刘昕
Owner TSINGHUA UNIV
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