WO2011088780A1

WO2011088780A1 - Method, system, outdoor unit and indoor unit for improving output performance

Info

Publication number: WO2011088780A1
Application number: PCT/CN2011/070364
Authority: WO
Inventors: 王伟; 许少峰; 宋亮
Original assignee: 华为技术有限公司
Priority date: 2010-01-19
Filing date: 2011-01-18
Publication date: 2011-07-28
Also published as: CN101800716A; CN101800716B

Abstract

A method, a system, an outdoor unit and an indoor unit for improving output performance are disclosed by the embodiment of the present invention. The method comprises: down converting a first analog data signal output by a power amplifier (PA) into a second analog data signal; performing analog-to-digital conversion on the second analog data signal to acquire a second digital data signal; and feeding the second digital data signal back to the indoor unit. The embodiment of the present invention can realize linearization of a sending link without the need of requiring the PA to work in a linear mode.

Description

Method and system for improving output performance and outdoor unit and indoor unit. Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. TECHNICAL FIELD The present invention relates to data processing techniques, and more particularly to a method and system for improving output performance, and an outdoor unit and an indoor unit.

Background technique

As a backbone transmission network device, a microwave transmission device can be used to connect the base station and the base station controller. A corresponding microwave transmission device may be separately disposed on the base station side and the base station controller side, and the microwave transmission devices on both sides generally include an outdoor device and an indoor device, wherein the outdoor device includes a microwave antenna and an Out Door Unit (ODU). Indoor equipment includes an In Door Unit (IDU). The signal sent from the IDU on one side passes through the ODU and the microwave antenna on the side and is sent to the other side. In order to make the transmitted signal undistorted, it can be realized by ensuring that the transmission link is linear. In the prior art, the power amplifier (PA) in the ODU is operated in a linear mode to ensure the linearity of the transmission link. The prior art has at least the following problems: When the PA operates in the linear mode, its working efficiency is too low. If the PA does not work in the linear mode, the distortion is large, that is, the output performance of the existing scheme is poor.

SUMMARY OF THE INVENTION Embodiments of the present invention provide a method and system for improving output performance, and an outdoor unit and indoor The unit solves the problem of poor output performance existing in the prior art.

The embodiment of the invention provides a method for improving output performance, including:

Downconverting a first analog data signal outputted by the power amplifier to a second analog data signal; performing analog-to-digital conversion on the second analog data signal to obtain a second digital data signal; and feeding the second digital data signal to the indoor unit So that the indoor unit performs digital pre-distortion according to the first digital data signal and the second digital data signal that have been generated by itself.

The embodiment of the invention further provides a method for improving output performance, including:

Receiving a second digital data signal fed back by the outdoor unit;

Calculating a digital pre-distortion coefficient according to the first digital data signal and the second digital data signal that have been generated by itself;

Performing digital predistortion processing on the first digital data signal by using the digital predistortion coefficient;

The digital pre-distortion processed digital data signal is digital-to-analog converted and transmitted to the outdoor unit.

An embodiment of the present invention provides an outdoor unit, including:

a down conversion module, configured to down convert a first analog data signal output by the power amplifier into a second analog data signal;

An analog-to-digital conversion module, configured to perform analog-to-digital conversion on the second analog data signal to obtain a second digital data signal;

And a feedback module, configured to feed back the second digital data signal to the indoor unit, so that the indoor unit performs digital predistortion according to the first digital data signal and the second digital data signal that have been generated by the indoor unit.

An embodiment of the present invention provides an indoor unit, including: a receiving module, configured to receive a second digital data signal fed back by the outdoor unit; and a calculating module, configured to calculate a digital pre-distortion coefficient according to the first digital data signal and the second digital data signal that have been generated by the computing unit;

a digital predistortion module, configured to perform digital predistortion processing on the first digital data signal by using the digital predistortion coefficient;

And a sending module, configured to perform digital-to-analog conversion of the digital pre-distortion processed digital data signal and send the digital data signal to the outdoor unit.

Embodiments of the present invention provide a system for improving output performance, including:

An indoor unit, configured to generate a first digital data signal, perform digital-to-analog conversion on the first digital data signal, and send the signal to a power amplifier in the outdoor unit;

An outdoor unit, configured to perform a down-conversion and an analog-to-digital conversion process on the first analog data signal output by the power amplifier to obtain a second digital data signal, and feed the second digital data signal to the indoor unit;

The indoor unit is further configured to calculate a digital pre-distortion coefficient according to the first digital data signal and the second digital data signal, and perform digital pre-distortion processing on the first digital data signal according to the digital pre-distortion coefficient, so that Sended to the outdoor unit.

According to the foregoing technical solution, the embodiment of the present invention re-feeds the signal output by the PA to the IDU through the ODU, so that the IDU can perform DPD, so as to realize linearization of the transmission link without requiring the PA working mode, and improve the work of the PA. Efficiency, energy savings, and improved output performance. DRAWINGS

FIG. 1 is a schematic flowchart diagram of a method according to a first embodiment of the present invention;

2 is a schematic structural diagram of an ODU according to a first embodiment of the present invention; 3 is a schematic flowchart of a method according to a second embodiment of the present invention;

4 is a schematic structural diagram of an ODU according to a second embodiment of the present invention;

FIG. 5 is a schematic flowchart of a method according to a third embodiment of the present invention;

6 is a schematic structural diagram of an IDU according to a third embodiment of the present invention;

7 is a schematic structural diagram of a system according to a fourth embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a system according to a fifth embodiment of the present invention. detailed description

The technical solution of the present invention will be further described in detail below through the accompanying drawings and embodiments. The IDU and the ODU can transmit signals through a multiplexer in the ODU. The multiplexer can include multiple filters, such as a low pass filter (LPF) or a band pass filter (Band Pass Filter, BPF). Different BPFs can be used to transmit signaling signals and data signals respectively. For example, the 5.5M corresponding BPF can be used to transmit the signaling signals sent by the IDU to the Amplitude Shift Keying (ASK) module in the ODU. Then, it is transmitted to the Micro Controller Unit (MCU) in the ODU through the ASK module; the BPF corresponding to the 10M can be used to transmit the signaling signal generated by the MCU received from the ASK module to the IDU. The BPF corresponding to the 350M can be used to receive the data signal sent by the IDU. Then, the data signal is sent to the PA through the transmission link in the ODU, and then sent to the microwave antenna through the combiner and the duplexer; the BPF corresponding to the 140M can be used. The data signal received from the receiving link is transmitted to the IDU.

In the above transmission mode, in order to ensure the linearity of the transmission link, it is usually adopted that the PA operates in a linear mode. However, because the PA works in linear mode, its efficiency is too low. In order to ensure the linearity of the transmission link and the operation mode of the PA, the following aspects are mainly adopted in the embodiment of the present invention: 1. In the ODU, the signal output by the PA is sent to the feedback channel through the coupler, and the feedback channel collects and stores the feedback data, which is controlled by the MCU. At the appropriate timing, the collected data is passed through the ASK. Passed to the IDU.

2. In the IDU, digital predistortion (DPD λ) is performed based on the initial digital baseband signal generated by the IDU and the digital baseband signal returned by the ODU.

Since the DPD can implement linearization of the transmission link, the IDU technology can implement linearization of the transmission link without requiring the PA working mode by using the DPD technology. The embodiment of the present invention can implement closed-loop DPD through the ODU and the IDU, and can implement adaptive DPD to better adapt to changes in the environment.

The scheme of the embodiment of the present invention is specifically described below:

FIG. 1 is a schematic flowchart of a method according to a first embodiment of the present invention, including:

Step 11: The ODU shifts the first analog data signal output by the power amplifier to a second analog data signal.

The frequency shift can be down-converted; the IDU can send the analog data signal to the ODU through the multiplexer (multiplexer) in the ODU, and then send it to the PA in the ODU through the transmission link in the ODU, and then pass the PA and the vehicle. The combiner and the duplexer are sent to the microwave antenna.

Step 12: The ODU performs analog-to-digital conversion on the second analog data signal to obtain a second digital data signal.

Step 13: The ODU feeds back the second digital data signal to the IDU.

Further, the ODU may buffer the obtained second digital data signal to wait for a suitable timing, such as an idle period for transmitting signaling, and feed the buffered second digital data signal to the IDU at an appropriate timing.

In this embodiment, the DPD can be performed in the IDU by feeding back the signal output by the PA to the IDU. In order to realize the linearization of the transmission link without requiring the PA working mode, the working efficiency of the PA is improved, and energy is saved.

FIG. 2 is a schematic structural diagram of an ODU according to a first embodiment of the present invention, including a down conversion module 21, an analog to digital conversion module 22, and a feedback module 23. The down conversion module 21 is configured to down convert the first analog data signal outputted by the power amplifier into a second analog data signal; the analog to digital conversion module 22 is coupled to the down conversion module 21, and configured to perform modulus on the second analog data signal. The second digital data signal is obtained after the conversion; the feedback module 23 is connected to the analog to digital conversion module 22 for feeding back the second digital data signal to the IDU.

The carrier frequency of the first analog data signal output by the PA may be the microwave frequency F2, and the carrier frequency of the second analog data signal obtained by the down conversion module 21 may be the intermediate frequency F0. Specifically, the down conversion module 21 can be a mixer having a local oscillation frequency of F0.

Further, the analog-to-digital conversion module 22 can be an analog-to-digital converter (ADC) with a buffer function, that is, the analog-to-digital conversion module 22 can buffer the second digital data signal so that the feedback module is suitable. The timing feeds back the second digital data signal to the IDU.

In this embodiment, by transmitting the signal output from the PA to the IDU, the DPD can be performed in the IDU to realize linearization of the transmission link without requiring the PA working mode, improve the working efficiency of the PA, save energy, and improve output. performance.

FIG. 3 is a schematic flowchart of a method according to a second embodiment of the present invention, including:

Step 31: The down conversion module in the ODU receives the first analog data signal sent by the coupler in the ODU, and the clutch is used to split the first analog data signal output by the PA in the ODU into two paths.

One of them is sent to the microwave antenna through the duplexer to be sent to the opposite ODU, and the other is fed back to the IDU.

Step 32: The down conversion module downconverts the first analog data signal into second analog data The signal is then sent to the analog to digital conversion module.

Step 33: The analog-to-digital conversion module performs analog-to-digital conversion on the second analog data signal to obtain a second digital data signal (for example, 12, Q2), and sends the signal to the feedback module.

Step 34: The MCU in the feedback module receives the second digital data signal, and then the MCU sends the second digital data signal to the ASK module.

The MCU can specifically receive the second digital data signal by using a serial port (such as SPI0 or SPI1 interface on the MCU); after that, the MCU adopts an interface with the ASK module (for example, the UART1 interface on the MCU) to the second digital data. The signal is handed over to the ASK module. .

Step 35: The ASK module feeds the second data signal to the IDU through the multiplexer.

The ASK module may send the second data signal to the IDU through a BPF (for example, the above-mentioned BPF corresponding to 10M) in the multiplexer for transmitting a signaling signal.

The analog-to-digital conversion module in this embodiment may further perform buffer processing on the obtained second digital data signal, and transmit the second digital data signal to the MCU when the MCU determines that the ASK module is in the idle period of the transmission signaling, and then , transmitted to the IDU through the ASK module and multiplexer.

In this embodiment, by transmitting the signal outputted by the PA to the IDU, DPD can be performed in the IDU to realize linearization of the transmission link without requiring the PA working mode, improve the working efficiency of the PA, and save energy. Moreover, in this embodiment, the existing components in the ODU are used, and the components are not added as much as possible, so that the existing resources can be better utilized, and the cost and layout space can be reduced.

4 is a schematic structural diagram of an ODU according to a second embodiment of the present invention, including a down conversion module 41, an analog-to-digital conversion module 42, and a feedback module 43. For the functions of the foregoing modules, refer to the first embodiment. The feedback module 43 in this embodiment includes an MCU 431, an ASK module 432, and a multiplexer 433. The coupler 44 is connected to the down conversion module 41 for splitting the first analog data signal output by the power amplifier into two paths, one of which is sent to the down conversion module. The MCU 431 is connected to the analog-to-digital conversion module 42. Specifically, the MCU 431 can be connected to the analog-to-digital conversion module 42 through a serial port for receiving the second digital data signal and sent to the ASK module 432. The ASK module 432 and the MCU 431 The connection is configured to receive the second digital data signal and send the signal to the multiplexer. The multiplexer 433 is coupled to the ASK module 432 for receiving the second digital data signal and transmitting the second digital data signal to the IDU.

In this embodiment, the signal output from the PA is fed back to the IDU, so that the IDU can perform DPD, so as to realize linearization of the transmission link without requiring the PA working mode, improve the working efficiency of the PA, and save energy. Moreover, in this embodiment, the existing components in the ODU are used, and the components are not added as much as possible, so that the existing resources can be better utilized, and the cost and layout space can be reduced.

FIG. 5 is a schematic flowchart of a method according to a third embodiment of the present invention, including:

Step 51: The IDU receives the second digital data signal fed back by the ODU.

Specifically, the IDU receives the second digital data signal sent by the multiplexer in the ODU. The second digital data signal is output by the power amplifier in the outdoor unit, and after being subjected to down-conversion and analog-to-digital conversion processing, is sequentially outputted to the microcontroller and the amplitude shift keying modulation module in the outdoor unit. The multiplexer.

Step 52: The IDU calculates a digital pre-distortion coefficient according to the first digital data signal and the second digital data signal that have been generated by the IDU.

The IDU can also calculate the link delay of the transmitted data back to the IDU before calculating the digital predistortion coefficient to ensure the synchronization of the collected first digital data signal and the second digital data signal, and ensure the calculation of the digital predistortion coefficient. accuracy.

Step 53: The IDU performs digital predistortion processing on the first digital data signal by using the digital predistortion coefficient.

The principle of Digital Predistortion (DPD) technology is as follows: Before entering the PA, the signal is first pre-distorted by using the DPD coefficient, and the distortion curve of the pre-distortion is exactly opposite to the distortion curve of the PA, thereby achieving the distortion purpose of eliminating the PA by 4 degrees.

The DPD coefficient can be implemented by using a plurality of models, and the DPD coefficient can be obtained by using one of the prior art, which is not limited herein.

Step 54: The IDU performs digital-to-analog conversion on the digital pre-distortion processed digital data signal and sends the digital data signal to the ODU.

In this embodiment, by adopting the DPD technology, the linearization of the transmission link can be realized when the PA operation mode is not required, and the PA can work in the class B or the AB class, which can improve the working efficiency of the PA, save energy, and improve output performance.

FIG. 6 is a schematic structural diagram of an IDU according to a third embodiment of the present invention, including a receiving module 61, a calculating module 62, a digital pre-distortion module 63, and a sending module 64. The receiving module 61 is configured to receive the second digital data signal fed back by the ODU; the calculating module 62 is coupled to the receiving module 61 for using the first digital data signal (eg, II, Q1) and the second digital data signal that have been generated according to itself. Calculating a digital predistortion coefficient; the digital predistortion module 63 is coupled to the calculation module 62 for performing digital predistortion processing on the first digital data signal by using the digital predistortion coefficient; the transmitting module 64 and the digital predistortion The module 63 is connected to perform digital-to-analog conversion of the digital pre-distortion processed digital data signal to the ODU.

FIG. 7 is a schematic structural diagram of a system according to a fourth embodiment of the present invention, including an IDU 71 and an ODU

72. The IDU 71 is configured to generate a first digital data signal, perform digital-to-analog conversion on the first digital data signal, and send the signal to the power amplifier in the ODU 72. The ODU 72 is connected to the IDU 71 for use in The first analog data signal outputted by the power amplifier is subjected to down-conversion and analog-to-digital conversion processing to obtain a second digital data signal, and the second digital data signal is fed back to the IDU 71; the IDU 71 is further configured to The first digital data signal and the second digital data signal are calculated to obtain a digital predistortion coefficient, and the first digital data signal is digitally predistorted according to the digital predistortion coefficient for transmission to the ODU.

In this embodiment, the digital pre-distortion processing in the ODU can realize the linearization of the transmission link without requiring the PA to work in the linear mode. The PA of this embodiment can work in the A-type working mode and the B-type working mode. Or in the AB working mode, improve the working efficiency of the PA and save energy. Moreover, in the embodiment, the closed loop DPD can be formed in the system composed of the IDU and the ODU through the above cycle, and the closed loop DPD can ensure the benefit of the DPD and ensure the stability of the system operation, and can adaptively adjust the coefficient of the DPD, thereby reducing the production. The requirements for commissioning, improve the straight-through rate and reduce the impact of the environment on the PA. Therefore, this embodiment can ensure the performance of the system and improve the competitiveness of the product.

FIG. 8 is a schematic structural diagram of a system according to a fifth embodiment of the present invention, including an IDU 81 and an ODU

82. The IDU 81 includes a receiving module 811, a calculating module 812, a digital pre-distortion module 813, and a sending module 814. The functions of the foregoing modules may be specifically referred to the third embodiment. One or more combinations of the foregoing modules may be integrated into one Field programmable gate array (Field

The programmable gate Array (FPGA) may further include a signaling generating module 815 and a data receiving module 816. The signaling generating module 815 is configured to generate a signaling signal and send the signal to the ODU 82. The data receiving module 816 is configured to receive the data signal sent by the ODU82. The ODU 82 includes a coupler 821, a down conversion module 822, an analog to digital conversion module 823, an MCU 824, an ASK module 825, and a multiplexer 826. The functions of the above modules may be specifically referred to the second embodiment.

For a better understanding of the embodiment, this embodiment also shows a transmission link 827 in the ODU. PA 828, duplexer 829, and receive link 820. The multiplexer 826 includes a first BPF 8261, a second BPF 8262, a third BPF 8263, and a fourth BPF 8264. The first BPF 8261 may correspond to a 10M frequency for transmitting signaling signals from the ODU to the IDU, and second. The BPF 8262 may correspond to a 5.5M frequency for transmitting signaling signals from the IDU to the ODU, the third BPF 8263 may correspond to a 350M frequency for transmitting data signals from the IDU to the ODU, and the fourth BPF 8264 may correspond to 140M. Frequency, used to transfer data signals from the ODU to the IDU.

For the connection relationship between the above modules, refer to FIG. 8.

In this embodiment, by adopting the DPD technology, the linearization of the transmission link can be realized without limiting the working mode of the PA, which can improve the working efficiency of the PA and save energy. By adopting the closed-loop DPD technology, the adaptive processing of the DPD can be realized, which can ensure The benefits of DPD reduce the requirements for production commissioning, improve the straight-through rate, and reduce the impact of the environment on the PA. By adding only the feedback path and corresponding components in the ODU, you can make full use of existing resources, reduce cost and power consumption, and save layout. Space; This embodiment can improve the system performance and improve the product competitiveness by forming a closed-loop DPD with less modifications in the middle system composed of the IDU and the ODU.

The system provided in the embodiment of the present invention may be a base station, a base station controller, or a base station system.

The indoor unit and/or the outdoor unit provided by the embodiment of the present invention may be located on the base station side or on the base station controller side, that is, the embodiment of the present invention further provides a base station, including any one of the foregoing embodiments. An indoor unit and/or an outdoor unit; and a base station controller including any one of the indoor unit and/or the outdoor unit provided in the above embodiments.

It will be understood by those skilled in the art that all or part of the steps of implementing the above method embodiments may be performed by hardware associated with the program instructions.

The descriptions of "first", "second" and the like in the embodiments of the present invention are only for making the description clearer, and are not Show the pros and cons of the program.

It should be noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and are not to be construed as limiting the embodiments of the present invention. The technical solutions of the present invention may be modified or equivalently substituted, and the modified technical solutions may not deviate from the spirit and scope of the technical solutions of the present invention.

Claims

Rights request

A method for improving output performance, comprising:

2. The method according to claim 1, wherein the first analog data signal is output by the power amplifier through a clutch, and the clutch is used to output a first simulation of the power amplifier. The data signal is divided into two paths, one of which is the first analog data signal.

The method according to claim 1 or 2, wherein the feeding back the second digital data signal to the indoor unit comprises:

The second digital data signal is fed back to the indoor unit through the microcontroller, the shift keying modulation module, and the multiplexer in sequence.

The method according to claim 3, wherein the feeding back the second digital data signal to the indoor unit comprises:

The second digital data signal is buffered, and the second digital data signal is fed back to the indoor unit by the multiplexer through an idle period in which the microcontroller transmits signaling during the shift keying modulation module.

5. A method for improving output performance, comprising:

Receiving a second digital data signal fed back by the outdoor unit;

Digital predistortion of the first digital data signal using the digital predistortion coefficient Reason

The method according to claim 5, wherein the receiving the second digital data signal fed back by the outdoor unit comprises:

Receiving, by the multiplexer in the outdoor unit, the second digital data signal, the second digital data signal is output by a power amplifier in the outdoor unit, and after frequency shifting and analog to digital conversion processing And outputting to the multiplexer through the microcontroller and the shift keying modulation module in the outdoor unit in sequence.

7. An outdoor unit, comprising:

The outdoor unit according to claim 7, further comprising:

And a coupler, configured to divide the first analog data signal output by the power amplifier into two paths, one of which is sent to the down conversion module.

The outdoor unit according to claim 7 or 8, wherein the feedback module comprises: a microcontroller connected to the analog to digital conversion module, and an amplitude shift keying modulation connected to the microcontroller a module and a multiplexer coupled to the shift keying modulation module, the multiplexer for The second digital data signal is fed back to the indoor unit.

10. The outdoor unit of claim 9 wherein:

The analog to digital conversion module is further configured to buffer the second digital data signal;

The microcontroller is configured to send the second digital data signal output by the analog to digital conversion module to the amplitude shifting modulation module during an idle period in which the amplitude shifting modulation module transmits signaling.

11. An indoor unit, comprising:

a receiving module, configured to receive a second digital data signal fed back by the outdoor unit;

a calculating module, configured to calculate a digital pre-distortion coefficient according to the first digital data signal that has been generated by itself and the second digital data signal;

The indoor unit according to claim 11, wherein the receiving module is specifically configured to receive a second digital data signal fed back by the outdoor unit by transmitting a signaling channel.

13. A system for improving output performance, comprising:

The indoor unit is configured to generate a first digital data signal, perform digital-to-analog conversion on the first digital data signal, and send the signal to the outdoor unit;

The outdoor unit is configured to perform down-conversion and analog-to-digital conversion processing on the first analog data signal output by the power amplifier to obtain a second digital data signal, and feed the second digital data signal to the indoor unit;

The indoor unit is further configured to calculate, according to the first digital data signal and the second digital data signal Calculating a digital pre-distortion coefficient, performing digital pre-distortion processing on the first digital data signal according to the digital pre-distortion coefficient for transmission to the outdoor unit.

14. The system of claim 13 wherein:

The indoor unit is the indoor unit of any one of claims 11-12;

The outdoor unit is the outdoor unit of any one of claims 7-10;

The receiving module is connected to the feedback module.

A base station, comprising:

16. The base station according to claim 15, wherein:

The indoor unit is the indoor unit of any one of claims 11-12;

The outdoor unit is the outdoor unit of any one of claims 7-10;

The receiving module is connected to the feedback module.

17. A base station controller, comprising:

An outdoor unit for downconverting and modulating the first analog data signal output by the power amplifier Number conversion processing, obtaining a second digital data signal, and feeding back the second digital data signal to the indoor unit;

18. The base station controller of claim 17, wherein

The indoor unit is the indoor unit of any one of claims 11-12;

The outdoor unit is the outdoor unit of any one of claims 7-10;

The receiving module is connected to the feedback module.