CORRECTION APPARATUS AND CORRECTION METHOD

• US 20200136706A1
• Filed: 12/26/2019
• Published: 04/30/2020
• Est. Priority Date: 06/26/2017
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: LV, Jinsong, CHEN, Mo, WANG, Wei, ZHANG, Zhiwei, ZHANG, Lie
• Granted Patent: US 11,265,061 B2
• Time in Patent Office: Days
• CPC Class Codes: H03F 1/32 Modifications of amplifiers to reduce non-linear distortion by negative feedback H03F1/34
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0686 Hybrid systems, i.e. switching and simultaneous transmission
• CPC Class Codes: H04L 27/364 Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels
• CPC Class Codes: H04L 27/367 using predistortion

Abstract

The present disclosure relates to correction apparatus and correction methods. One example correction apparatus includes a first adjustment module, a plurality of second adjustment modules, a correction calculation module, and a plurality of non-ideal channels. One second adjustment module is disposed on one non-ideal channel. The first adjustment module is connected to each non-ideal channel. The correction calculation module is separately connected to the first adjustment module and the plurality of second adjustment modules. The correction calculation module is connected to an output end of each non-ideal channel. The non-ideal channel is a channel that outputs an output signal in response to a drive signal having an error value.

Claims

1. A correction apparatus, wherein the correction apparatus comprises a first adjustment module, a plurality of second adjustment modules, a correction calculation module, and a plurality of non-ideal channels, wherein one second adjustment module is disposed on one non-ideal channel, wherein the first adjustment module is connected to each non-ideal channel, wherein the correction calculation module is separately connected to the first adjustment module and the plurality of second adjustment modules, wherein the correction calculation module is connected to an Output end of each non-ideal channel, and wherein the non-ideal channel is a channel that outputs an output signal in response to a drive signal having an error value;

wherein the correction calculation module is configured to obtain a first adjustment parameter and a second adjustment parameter through calculation based on the output signal of the non-ideal channel and a reference signal, and wherein the reference signal is obtained based on the drive signal;

wherein the first adjustment module is configured to adjust the drive signal based on the first adjustment parameter to uniformly correct error values of output signals of the plurality of non-ideal channels; and

wherein the second adjustment module on each non-ideal channel is configured to adjust a channel signal based on the second adjustment parameter to correct a part that is of the error value and that is not corrected by the first adjustment module, and wherein the channel signal is a signal that is input to the non-ideal channel after the first adjustment module adjusts the drive signal.

2. The correction apparatus according to claim 1, wherein:

the reference signal comprises the drive signal and the input signal of the non-ideal channel;

the correction calculation module comprises a first calculation unit and a second calculation unit, the first calculation unit is connected to the first adjustment module, the second calculation unit is connected to the second adjustment module, and the second calculation unit is further connected to an input end of the non-ideal channel;

the first calculation unit is configured to obtain the first adjustment parameter through calculation based on the output signal of the non-ideal channel and the drive signal; and

the second calculation unit is configured to obtain the second adjustment parameter through calculation based on an output signal and an input signal that belong to a same non-ideal channel.

3. The correction apparatus according to claim I, wherein:

the first adjustment module is a digital predistortion module;

the second adjustment module is a nonlinear adjustment module;

the correction calculation module is a hybrid beamforming (HBF) predistortion calculation module;

the first adjustment parameter is a digital predistortion parameter;

the second adjustment parameter is an analog nonlinear correction parameter;

the drive signal is a digital I/Q complex signal;

the non-ideal channel is an analog channel;

the channel signal is a radio frequency signal;

the correction apparatus further comprises a digital-to-analog converter and a plurality of power amplifiers, one power amplifier is disposed on one analog channel, the power amplifier is connected to an output end of the nonlinear adjustment module, an input end of the digital-to-analog converter is connected to the digital predistortion module, an output end of the digital-to-analog converter is separately connected to the plurality of nonlinear adjustment modules, a factor in generation of the error value of the output signal of the analog channel comprises nonlinearity of the power amplifier, and the output signal of the analog channel is an output signal of the power amplifier;

the digital predistortion module is configured to perform predistortion adjustment on the digital I/Q complex signal based on the digital predistortion parameter to uniformly compensate for nonlinearity of the plurality of power amplifiers; and

the nonlinear adjustment module is configured to perform nonlinear adjustment on the radio frequency signal based on the analog nonlinear correction parameter to compensate for a part that is of the nonlinearity of the power amplifier and that is not compensated by the digital predistortion module.

4. The correction apparatus according to claim 3, wherein the HBF predistortion calculation module is further configured to obtain the digital predistortion parameter through calculation based on an output signal of any analog channel and the digital I/Q complex signal.

5. The correction apparatus according to claim 3, wherein:

the reference signal comprises the digital I/Q complex signal and the input signal of the analog channel;

the HBF predistortion calculation module comprises a first calculation unit and a second calculation unit, the first calculation unit is connected to the digital predistortion module, the second calculation unit is connected to the nonlinear adjustment module, and the second calculation unit is further connected to an input end of each analog channel;

the first calculation unit is configured to obtain the digital predistortion parameter through calculation based on the output signal of the analog channel and the digital I/Q complex signal; and

the second calculation unit is configured to obtain the analog nonlinear correction parameter through calculation based on an output signal and an input signal that belong to a same analog channel.

6. The correction apparatus according to claim 3, wherein:

a switch module is further disposed between the HBF predistortion calculation module and output ends of the plurality of power amplifiers in the correction apparatus; and

the switch module is configured to select an output signal of one of a plurality of analog channels in a time-division manner, wherein the HBF predistortion calculation module obtains the output signal of the analog channel.

7. The correction apparatus according to claim 3, wherein:

on each analog channel, the correction apparatus further comprises at least one of an analog gain adjustment module or an analog phase adjustment module, the at least one of the analog gain adjustment module or the analog phase adjustment module is close to an input end of the power amplifier, the analog gain adjustment module is connected to the HBF predistortion calculation module, and the analog phase adjustment module is connected to the HBF predistortion calculation module;

the analog gain adjustment module is configured to perform gain adjustment on the radio frequency signal based on an analog gain adjustment parameter;

the analog phase adjustment module is configured. to perform phase adjustment on the radio frequency signal based on an analog phase adjustment parameter; and

the HBF predistortion calculation module is further configured to obtain the at least one of the analog gain adjustment parameter or the analog phase adjustment parameter through calculation based on the output signal of the analog channel.

8. The correction apparatus according to claim 3, wherein:

the correction apparatus further comprises an amplitude phase correction module, a plurality of transmit channels, and a plurality of receive channels, the transmit channel and the receive channel each are connected to an antenna, the transmit channel is the analog channel, the receive channel is an analog channel used to receive an antenna signal, one end of the amplitude phase correction module is connected to a port of the antenna, the other end of the amplitude phase correction module is connected to a channel on which a signal is output to the plurality of transmit channels, and the other end of the amplitude phase correction module is further connected to a channel on which a signal is obtained from the plurality of receive channels; and

the amplitude phase correction module is configured to;

perform amplitude phase calibration on the plurality of transmit channels; and

perform amplitude phase calibration on the plurality of receive channels.

9. The correction apparatus according to claim 8, wherein:

the transmit channel and the receive channel are packaged in a form of a chip;

the chip comprises the transmit channel and the receive channel, and the amplitude phase correction module is separately connected to the transmit channel and the receive channel by using a switching switch; and

the switching switch is configured to connect the amplitude phase correction module to the transmit channel and the receive channel in a time-division manner, wherein the amplitude phase correction module performs amplitude phase calibration on the plurality of transmit channels and performs amplitude phase calibration on the plurality of receive channels in a time-division manner.

10. The correction apparatus according to claim 8, wherein:

the transmit channel and the receive channel are packaged in a form of a chip;

each chip of a plurality of chips comprises the plurality of transmit channels or the plurality of receive channels; and

the amplitude phase correction module is configured to;

first perform amplitude phase calibration on the plurality of transmit channels or the plurality of receive channels in the chip; and

then perform amplitude phase calibration on the transmit channels or the receive channels in different chips.

11. A correction method, wherein the method is applied to a correction calculation module in a correction apparatus, wherein the correction apparatus comprises a first adjustment module, a plurality of second adjustment modules, the correction calculation module, and a plurality of non-ideal channels, wherein one second adjustment module is disposed on one non-ideal channel, wherein the first adjustment module is connected to each non-ideal channel, wherein the correction calculation module is separately connected to the first adjustment module and the plurality of second adjustment modules, wherein the correction calculation module is connected to an output end of each non-ideal channel, wherein the non-ideal channel is a channel that outputs an output signal in response to a drive signal having an error value, and wherein the method comprises:

obtaining, by the correction calculation module, the output signal of the non-ideal channel and a reference signal, wherein the reference signal is obtained based on the drive signal;

obtaining, by the correction calculation module, a first adjustment parameter and a second adjustment parameter through calculation based on the output signal of the non-ideal channel and the reference signal;

outputting, by the correction calculation module, the first adjustment parameter to the first adjustment module, wherein the first adjustment module adjusts the drive signal based on the first adjustment parameter to uniformly correct error values of output signals of the plurality of non-ideal channels; and

outputting, by the correction calculation module, the second adjustment parameter to the second adjustment module on each non-ideal channel, wherein the second adjustment module on each non-ideal channel adjusts a channel signal based on the second adjustment parameter to correct a part that is of the error value and that is not corrected by the first adjustment module, wherein the channel signal is a signal that is input to the non-ideal channel after the first adjustment module adjusts the drive signal.

12. The method according to claim 11, wherein:

the reference signal comprises the drive signal and the input signal of the non-ideal channel;

the correction calculation module comprises a first calculation unit and a second calculation unit, the first calculation unit is connected to the first adjustment module, the second calculation unit is connected to the second adjustment module, and the second calculation unit is further connected to an input end of the non-ideal channel; and

the obtaining, by the correction calculation module, a first adjustment parameter and a second adjustment parameter through calculation based on the output signal of the non-ideal channel and the reference signal comprises;

obtaining, by the first calculation unit, the first adjustment parameter through calculation based on the output signal of the non-ideal channel and the drive signal; and

obtaining, by the second calculation unit, the second adjustment parameter through calculation based on an output signal and an input signal that belong to a same non-ideal channel.

13. The method according to claim 11, wherein:

the first adjustment module is a digital predistortion module;

the second adjustment module is a nonlinear adjustment module;

the correction calculation module is a hybrid beamforming (HBF) predistortion calculation module;

the first adjustment parameter is a digital predistortion parameter;

the second adjustment parameter is an analog nonlinear correction parameter;

the drive signal is a digital I/Q complex signal;

the non-ideal channel is an analog channel;

the channel signal is a radio frequency signal;

the correction apparatus further comprises a digital-to-analog converter and a plurality of power amplifiers, one power amplifier is disposed on one analog channel, the power amplifier is connected to an output end of the nonlinear adjustment module, an input end of the digital-to-analog converter is connected to the digital predistortion module, an output end of the digital-to-analog converter is separately connected to the plurality of nonlinear adjustment modules, a factor in generation of the error value of the output signal of the analog channel comprises nonlinearity of the power amplifier, and the output signal of the analog channel is an output signal of the power amplifier;

the outputting, by the correction calculation module, the first adjustment parameter to the first adjustment module comprises;

outputting, by the HBF predistortion calculation module, the digital predistortion parameter to the digital predistortion module, wherein the digital predistortion module performs predistortion adjustment on the digital I/Q complex signal based on the digital predistortion parameter, to uniformly compensate for nonlinearity of the plurality of power amplifiers; and

the outputting, by the correction calculation module, the second adjustment parameter to the second adjustment module on each non-ideal channel comprises;

outputting, by the HBF predistortion calculation module, the analog nonlinear correction parameter to the nonlinear adjustment module on each analog channel, wherein the nonlinear adjustment module performs nonlinear adjustment on the radio frequency signal based on the analog nonlinear correction parameter, to compensate for a part that is of the nonlinearity of the power amplifier and that is not compensated by the digital predistortion module.

14. The method according to claim 13, wherein:

the obtaining, by the correction calculation module, an output signal of the non-ideal channel comprises;

obtaining, by the HBF predistortion calculation module, an output signal of any analog channel; and

the obtaining, by the correction calculation module, a first adjustment parameter through calculation based on the output signal of the non-ideal channel and the reference signal comprises;

obtaining, by the HBF predistortion calculation module, the digital predistortion parameter through calculation based on the output signal of any analog channel and the digital I/Q complex signal.

15. The method according to claim 13, wherein:

the reference signal comprises the digital I/Q complex signal and the input signal of the analog channel;

the HBF predistortion calculation module comprises a first calculation unit and a second calculation unit, the first calculation unit is connected to the digital predistortion module, the second calculation unit is connected to the nonlinear adjustment module, and the second calculation unit is further connected to an input end of each analog channel;

the obtaining, by the correction calculation module, the output signal of the non-ideal channel and a reference signal comprises;

obtaining, by the first calculation unit, the output signal of the analog channel and the digital I/Q complex signal; and

obtaining, by the second calculation unit, the output signal of the analog channel and the input signal of the analog channel; and

the obtaining, by the correction calculation module, a first adjustment parameter and a second adjustment parameter through calculation based on the output signal of the non-ideal channel and the reference signal comprises;

obtaining, by the first calculation unit, the digital predistortion parameter through calculation based on the output signal of the analog channel and the digital I/Q complex signal; and

obtaining, by the second calculation unit, the analog nonlinear correction parameter through calculation based on an output signal and an input signal that belong to a same analog channel.

16. The method according to claim 15, wherein the obtaining, by the second calculation unit, the analog nonlinear correction parameter through calculation based on an output signal and an input signal that belong to a same analog channel comprises:

obtaining, by the second calculation unit, a difference value through calculation based on the output signal and the input signal that belong to the same non-ideal channel, wherein the difference value is a difference between an output signal of the power amplifier on the analog channel and a preset output signal; and

obtaining, by the second calculation unit, the analog nonlinear correction parameter through calculation by applying a cascaded predistortion (PD) model to the difference value.

17. The method according to claim 13, wherein:

on each analog channel, the correction apparatus further comprises at least one of an analog gain adjustment module or an analog phase adjustment module, the at least one of the analog gain adjustment module or the analog phase adjustment module is close to an input end of the power amplifier, the analog gain adjustment module is connected to the HBF predistortion calculation module, and the analog phase adjustment module is connected to the HBF predistortion calculation module; and

the method further comprises;

obtaining, by the HBF predistortion calculation module, the at least one of an analog gain adjustment parameter or an analog phase adjustment parameter through calculation based on the output signal of the analog channel;

outputting, by the HBF predistortion calculation module, the analog gain adjustment parameter to the analog gain adjustment module, wherein the analog gain adjustment module performs gain adjustment on the radio frequency signal based on the analog gain adjustment parameter; and

outputting, by the HBF predistortion calculation module, the analog phase adjustment parameter to the analog phase adjustment module, wherein the analog phase adjustment module performs phase adjustment on the radio frequency signal based on the analog phase adjustment parameter.