Digital Predistortion Structure and Control Method for Beamforming System

A technology of digital pre-distortion and beamforming, which is applied in transmission systems, baseband system components, radio transmission systems, etc., can solve the problems of pre-distortion linearization performance deterioration and inability to correct, so as to reduce computing energy consumption and improve Linear performance, effect of simplified transmitter structure
CN107566306BActive Publication Date: 2020-01-24TSINGHUA UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2020-01-24

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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.
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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...

Claims

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