Digital pre-distortion structure, analog full-connection hybrid beam forming system and transmitter

Abstract

The invention discloses a digital pre-distortion structure, an analog full-connection hybrid beam forming system and a transmitter, and the structure comprises a time delay alignment module which is used for carrying out the time alignment of an equivalent power amplifier output signal of a power amplifier array in a digital domain and an equivalent power amplifier input signal of the power amplifier array in the digital domain; a multi-beam estimation module used for synthesizing the equivalent power amplifier output signals after time alignment into equivalent multi-beam signals in a digitaldomain according to beam forming conditions; a pre-distorter training module used for training based on the equivalent multi-beam signal and the transmitting signal of the transmitting link to obtaina model of Q input into a pre-distorter, wherein Q is greater than or equal to 2; and a multiple-input-multiple-output predistorter module comprising Q Q input predistorters, wherein each predistorter is used for carrying out linearization correction on Q paths of transmitting signals transmitted by the connected transmitting link. Therefore, adjacent channel spectrum leakage is significantly suppressed, and the signal linearity in the beam direction is significantly improved.

Description

technical field [0001] The disclosure belongs to the technical field of mobile communication, and relates to a digital predistortion structure, an analog fully connected hybrid beamforming system and a transmitter, in particular to a digital predistortion structure for an analog fully connected hybrid beamforming system, including the digital predistortion Structured simulation of a fully connected hybrid beamforming system and transmitter. Background technique [0002] Modern wireless communication systems widely adopt multiple-input multiple-output (MIMO) technology to support the rapidly increasing number of users. In the coming 5G era, the number of transmitter radio frequency links will further increase. Correspondingly, massive MIMO (mMIMO) technology has become a crucial technology in 5G transmitters, which is expected to significantly increase network capacity and transmission data rate. , Improve communication reliability. Massive MIMO systems are often combined w...

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Problems solved by technology

However, in a hybrid massive MIMO transmitter, the number of transmission chains is far less than the number of antennas and PAs, and each digital signal needs to drive multiple PAs, so a DPD module is configured for each PA for independent linearization Traditional solutions are practically impossible

[0004]At present, most of the research is mainly on the digital predistortion scheme of the sub-array connection architecture hybrid beamforming system, because the sub-array connection architecture hybrid beamforming system and the analog full connection architecture The difference in the structure of the hybrid beamforming system, the existing digital predistortion scheme for the hybrid beamforming system of the sub-array connection architecture is not suitable for the analog full-connection hybrid beamforming system, the signals from different transmission links are in front of the power amplifier Combination, the radio frequency signal containing the transmitted signals of each channel will produce complex nonlinear intermodulation distortion after passing through the power amplifier. Since these distortions are nonlinear, the signal in the beam direction after spatial synthesis still contains these intermodulation distortions, which seriously deteriorates the reception Therefore, it is necessary to propose a digital predistortion structure for analog fully connected hybrid beamforming systems to solve the problem of received signal distortion

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