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Optimization method of digital predistortion at transmitter of mimo system based on input sequence

A technology of digital pre-distortion and input sequence, applied in synchronization/start-stop system, improved amplifier to reduce nonlinear distortion, power amplifier, etc., can solve problems such as large resource consumption, impossible completion, and increased number of coefficients, and achieve simplification Non-linear model, effect of reducing computational complexity

Inactive Publication Date: 2019-03-15
SHANGHAI JINUOSHI AUTOMOBILE PARTS
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Problems solved by technology

However, compared with the single-input case, the number of estimated coefficients required by the MVP model has greatly increased, making the amount of calculation significantly too large.
Moreover, the number of parameters will increase with the number of antennas and the order and delay of the polynomial, which will bring a very large resource consumption, and it is even impossible to complete

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  • Optimization method of digital predistortion at transmitter of mimo system based on input sequence
  • Optimization method of digital predistortion at transmitter of mimo system based on input sequence
  • Optimization method of digital predistortion at transmitter of mimo system based on input sequence

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Embodiment Construction

[0022] The technical content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] As mentioned above, there is crosstalk between antennas in the radio frequency front end of the MIMO system. The crosstalk is classified into nonlinear crosstalk and linear crosstalk according to whether it occurs before or after the power amplifier. Linear crosstalk can be processed as part of the channel at the receiving end, and nonlinear crosstalk will affect predistortion at the transmitting end, so it needs to be taken into account during predistortion processing. However, the model of the predistortion of the power amplifier after considering the crosstalk is relatively complicated, and there are many parameters to be calculated, and the calculation complexity is relatively high.

[0024] In order to accurately and efficiently perform pre-distortion processing on the transmitting end of the MIMO...

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Abstract

The present invention discloses an MIMO system transmitting end digital pre-distortion optimization method based on an input sequence. The method comprises a step of using a memory polynomial model to characterize the power amplifier of a transmitting end, a step of inputting a predetermined input sequence to the model of the power amplifier such that the input signals between different antennas have association, simplifying the memory polynomial models of multiple antennas as similar with the memory polynomial model of a single antenna, and estimating a corresponding coefficient, and a step of separating a crosstalk coefficient and the coefficient of the power amplifier according to the coefficient estimated by the input sequence, and compensating the crosstalk influence and the nonlinear influence of the power amplifier. Through optimized design of the input sequence, a nonlinear model is simplified, and the computational complexity is reduced.

Description

technical field [0001] The invention relates to a digital predistortion optimization method, in particular to an input sequence-based digital predistortion optimization method at a transmitting end of a MIMO system, and belongs to the technical field of wireless communication. Background technique [0002] The MIMO (Multiple Input Multiple Output) system is widely used in modern wireless communication systems because it adopts multiple antennas, which can significantly expand the system capacity and is robust to multipath fading channels. However, since multiple antennas are on the same chip, this will introduce crosstalk between the antennas. The crosstalk that occurs before the power amplifier (PowerAmplifier, PA for short) makes the modeling of the power amplifier significantly different from the SISO (single-input single-output) system, and the crosstalk coefficient between the antennas is also included in the model, which will make The power amplifier model in the MIMO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49H03F1/32H03F3/20
Inventor 钱骅
Owner SHANGHAI JINUOSHI AUTOMOBILE PARTS
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