CN105517200B - Method and device for processing transmitted signal - Google Patents
Method and device for processing transmitted signal Download PDFInfo
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- CN105517200B CN105517200B CN201410500343.4A CN201410500343A CN105517200B CN 105517200 B CN105517200 B CN 105517200B CN 201410500343 A CN201410500343 A CN 201410500343A CN 105517200 B CN105517200 B CN 105517200B
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Abstract
The embodiment of the application provides a method and a device for processing a transmission signal, wherein in the process of transmitting a first signal of a first communication system, before the first signal is input into a power amplifier, the first signal is subjected to pre-distortion processing by using a first input/output characteristic, because the first input/output characteristic and a second input/output characteristic of the power amplifier, through which the first signal passes, are superposed to form a third input/output characteristic which meets the requirement of the first communication system on the transmission signal, the power amplifier can be used for amplifying signals of communication systems which do not conform to the input/output characteristic of the power amplifier, therefore, in a signal transmission system, the same power amplifier can be used for amplifying transmission signals of different communication systems, and the purpose of reducing the volume of a communication terminal is achieved.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a method and an apparatus for processing a transmission signal.
Background
At present, more and more systems and frequency bands need to be supported by communication terminals, for example, a mobile phone needs to support GSM, CDMA, LTE, and the like. Generally, a communication terminal needs to amplify a signal by a power amplifier and then transmit the signal. It can be seen that the input and output of the finally transmitted signal may be affected by the power amplifier.
Because the final transmission signals of different standards have different requirements on the input and output characteristics, the transmission signals of different standards have different requirements on the input and output characteristics of the power amplifier, for example, a GSM signal requires that the output power of the power amplifier is nonlinear with the change of the input power, and an LTE signal requires that the output power of the power amplifier is highly linear with the change of the input power.
Because the current power amplifier has fixed input and output characteristics, different power amplifiers are required for different standards, so that different power amplifiers need to be simultaneously arranged in the communication terminal to meet the requirements of transmitting signals of different standards, and this undoubtedly results in overlarge layout area of circuit layout, thereby being not beneficial to reducing the volume of the communication terminal.
Content of application
The embodiment of the application provides a method and a device for processing a transmitted signal, and aims to solve the problem that the size of a communication terminal is not reduced due to the fact that different power amplifiers need to be arranged in the communication terminal at the same time to meet the requirements of transmitting signals of different systems.
In order to achieve the above object, the embodiments of the present application provide the following technical solutions:
a transmit signal processing method, comprising:
in the process of transmitting a first signal of a first communication system, before the first signal is input into a power amplifier, pre-distortion processing is carried out on the first signal by using first input-output characteristics;
the power amplifier has a second input-output characteristic, the first input-output characteristic and the second input-output characteristic are superposed to form a third input-output characteristic, and the third input-output characteristic meets the requirement of the first communication system on a transmission signal.
Optionally, the method is applied to an electronic device, where the electronic device includes at least two communication paths, a first communication path supports a first communication standard, a second communication path supports a second communication standard, the first communication standard is different from the second communication standard, a signal of the first communication standard and a signal of the second communication standard share the power amplifier, the power amplifier may cover frequency bands of the signal of the first communication standard and the signal of the second communication standard, and before the pre-distortion processing is performed on the first signal by using a first input/output characteristic, the method further includes:
acquiring the first input and output characteristic;
wherein the specific process of acquiring the first input/output characteristic includes:
acquiring the second input and output characteristic;
determining a reference signal under the first communication system by inquiring a one-to-one correspondence between preset input and output characteristics and different communication systems, wherein the reference signal has the third input and output characteristics;
and calculating the first input-output characteristic according to the reference signal and the second input-output characteristic, so that the third input-output characteristic is formed after the first input-output characteristic and the second input-output characteristic are superposed.
Optionally, the obtaining the second input-output characteristic includes:
generating a transmission test signal;
sending the transmit test signal to the power amplifier;
acquiring a transmission test signal amplified by the power amplifier;
and performing down-conversion processing on the transmission test signal amplified by the power amplifier to obtain a baseband test signal, wherein the input and output characteristics of the baseband test signal are the second input and output characteristics.
Optionally, the method further comprises:
storing the first input-output characteristic.
Optionally, the method further comprises:
and the first signal after the pre-distortion treatment is subjected to in-phase quadrature IQ modulation and then is sent to the power amplifier through a signal transceiver.
A transmission signal processing apparatus comprising:
the predistortion processing module is used for performing predistortion processing on a first signal by using a first input/output characteristic before the first signal is input into a power amplifier in the process of transmitting the first signal of a first communication system, the power amplifier has a second input/output characteristic, a third input/output characteristic is formed after the first input/output characteristic and the second input/output characteristic are superposed, and the third input/output characteristic meets the requirement of the first communication system on the transmission signal.
Optionally, the apparatus is applied to an electronic device, where the electronic device at least includes two communication paths, a first communication path supports a first communication system, a second communication path supports a second communication system, and a signal of the first communication system and a signal of the second communication system share a power amplifier that can cover a frequency band of the power amplifier, and the apparatus further includes:
an obtaining module, configured to obtain a first input/output characteristic before the predistortion processing module performs predistortion processing on the first signal by using the first input/output characteristic;
wherein, the acquisition module specifically includes:
an acquisition unit configured to acquire the second input/output characteristic;
the determining unit is used for determining a reference signal under the first communication system by inquiring the one-to-one correspondence between a preset input/output characteristic curve and different communication systems, wherein the reference signal has the third input/output characteristic;
and the calculating unit is used for calculating the first input-output characteristic according to the reference signal and the second input-output characteristic, so that the third input-output characteristic is formed after the first input-output characteristic and the second input-output characteristic are superposed.
Optionally, the obtaining unit includes:
a signal generating subunit, configured to generate a transmission test signal;
a transmitting subunit for transmitting the transmission test signal to the power amplifier;
the signal sampling subunit is used for acquiring the emission test signal amplified by the power amplifier;
and the signal processing subunit is configured to perform down-conversion processing on the transmission test signal amplified by the power amplifier to obtain a baseband test signal, where an input/output characteristic of the baseband test signal is the second input/output characteristic.
Optionally, the method further comprises:
and the storage module is used for storing the first input and output characteristics.
Optionally, the method further comprises:
and the sending module is used for sending the first signal after the pre-distortion treatment to the power amplifier through a signal transceiver after IQ modulation.
In the method and apparatus for processing a transmitted signal provided in the embodiment of the present application, in the process of transmitting a first signal of a first communication system, pre-distorting said first signal using a first input-output characteristic before inputting said first signal into a power amplifier, because the first input-output characteristic is superposed with the second input-output characteristic of the power amplifier through which the first signal will pass, a third input-output characteristic is formed, and the third input/output characteristic meets the requirement of the first communication system on the transmission signal, and as can be seen, the method and the device of the embodiment of the application, after the first signal after the pre-distortion processing passes through the power amplifier, even if the input/output characteristics of the power amplifier do not meet the requirements of the first communication system on the transmission signal, the first signal can meet the requirements of the first communication system due to the pre-distortion processing. Therefore, the power amplifier can be used for amplifying signals of communication systems which are not in accordance with the input and output characteristics of the power amplifier, so that the same power amplifier can be used for amplifying transmission signals of different communication systems in a signal transmission system, and the purpose of reducing the volume of the communication terminal is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for processing a transmission signal according to an embodiment of the present disclosure;
fig. 2 is a flowchart of another method for processing a transmission signal according to an embodiment of the present disclosure;
FIG. 3 is a flowchart illustrating a specific method for obtaining a second input/output characteristic according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a transmit signal processing apparatus according to an embodiment of the present application.
Detailed Description
The embodiment of the application discloses a method for processing a transmitted signal, which can be applied to a signal transmitting system, wherein the signal transmitting system comprises a power amplifier used for amplifying the power of a signal to be transmitted before transmitting the signal. The power amplifier has a second input-output characteristic.
In the method described in this embodiment, in the process of transmitting the first signal of the first communication system, before inputting the first signal into the power amplifier, the first signal is subjected to predistortion processing by using the first input/output characteristic.
And after the first input-output characteristic and the second input-output characteristic are superposed, a third input-output characteristic is formed, and the third input-output characteristic meets the requirement of the first communication system on a transmission signal.
In the method and apparatus for processing a transmission signal described in this embodiment, before the transmission of a signal, a signal is pre-distorted using a first input/output characteristic, and after the first output/output characteristic is superimposed with a second input/output characteristic of a power amplifier, a signal satisfying a requirement of a first communication system for the transmission signal can be formed, so that even if the input/output characteristic of the power amplifier does not satisfy the requirement of the first communication system, the signal of the first communication system can be amplified, and therefore, the power amplifier is not limited by the communication system, and as long as the first input/output characteristic is preset, a signal of a different communication system can be amplified using one power amplifier, so that the applicability of the power amplifier is improved, and in a signal transmission system including a plurality of different communication systems, a signal of a different communication system can be amplified using the same power amplifier, it is advantageous to simplify the structure of the signal transmission system.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The method for processing the transmitted signal disclosed in the embodiment of the present application is applied to an electronic device, the electronic device at least includes two communication paths, a first communication path supports a first communication system, a second communication path supports a second communication system, the first communication system is different from the second communication system, a signal of the first communication system and a signal of the second communication system share the power amplifier, and the power amplifier can cover frequency bands of the signal of the first communication system and the signal of the second communication system, as shown in fig. 1, the method includes the following steps:
s101: acquiring a first input/output characteristic;
s102: pre-distortion processing is carried out on the first signal by using the first input and output characteristics;
the predistortion processing may be implemented by power compensation, phase compensation or amplitude compensation, and the specific implementation manner may refer to an existing predistortion processing method, which is not described herein again.
S103: and transmitting the pre-distorted first signal to the power amplifier through a signal transceiver after IQ (in-phase quadrature) modulation.
The method in this embodiment is applied to an electronic device including a plurality of communication paths of different communication schemes, and is different from the prior art in that the communication paths of different communication schemes share one power amplifier, and because the communication signals are subjected to predistortion processing before entering the power amplifier, even if the power amplifier does not support a signal of a certain communication scheme, the signal after power amplification can meet the requirement of the communication scheme, so that the number of the power amplifiers in the electronic device can be significantly reduced, thereby being beneficial to realizing the ultra-thin design of the electronic device.
An embodiment of the present application discloses a method for processing a transmission signal, as shown in fig. 2, including the following steps:
s201: acquiring the output characteristic of the power amplifier, and recording the output characteristic as a second input/output characteristic;
s202: determining a reference signal under the first communication system by inquiring a one-to-one correspondence between preset input and output characteristics and different communication systems, wherein the reference signal has the third input and output characteristics;
s203: calculating the first input-output characteristic according to the reference signal and the second input-output characteristic, so that the third input-output characteristic is formed after the first input-output characteristic and the second input-output characteristic are superposed;
s204: storing the first input-output characteristic;
specifically, the input-output characteristics may be stored in a table form, that is, the output parameters are stored in a table in correspondence with the input parameters.
S205: pre-distortion processing is carried out on the first signal by using first input and output characteristics;
s206: and carrying out IQ modulation on the first signal subjected to the predistortion treatment, and then sending the first signal to the power amplifier through a signal transceiver.
In this embodiment, a one-to-one correspondence between the input/output characteristics and different communication systems may be preset, so that in the process of transmitting a signal, the input/output characteristics required by the communication system of the signal to be transmitted are determined by querying the correspondence, so as to calculate the first input/output characteristics, and the signal to be transmitted is subjected to predistortion processing by using the first input/output characteristics, so that the signal to be transmitted meets the requirements of the communication systems.
In this embodiment, as shown in fig. 3, a specific method for obtaining the second input/output characteristic may specifically include the following steps:
s301: generating a transmission test signal;
s302: sending the transmit test signal to the power amplifier;
s303: acquiring a transmission test signal amplified by the power amplifier;
s304: and performing down-conversion processing on the transmission test signal amplified by the power amplifier to obtain a baseband test signal, wherein the input and output characteristics of the baseband test signal are the second input and output characteristics.
The second input and output characteristic can be obtained by utilizing the existing equipment of the electronic equipment, and additional equipment is not required to be added, so that the hardware implementation is easy, and the cost of the electronic equipment is not increased.
Corresponding to the above method embodiment, the embodiment of the present application further discloses a device for processing a transmitted signal, including:
the predistortion processing module is used for performing predistortion processing on a first signal by using a first input/output characteristic before the first signal is input into a power amplifier in the process of transmitting the first signal of a first communication system, the power amplifier has a second input/output characteristic, a third input/output characteristic is formed after the first input/output characteristic and the second input/output characteristic are superposed, and the third input/output characteristic meets the requirement of the first communication system on the transmission signal.
Specifically, the device can be applied to an electronic device, the electronic device at least comprises two communication paths, a first communication path supports a first communication system, a second communication path supports a second communication system, and signals of the first communication system and signals of the second communication system share one power amplifier capable of covering a frequency band of the power amplifier.
As shown in fig. 4, the apparatus may specifically include:
an obtaining module 401, configured to obtain the first input/output characteristic;
a predistortion processing module 402, configured to, in a process of transmitting a first signal of a first communication system, perform predistortion processing on the first signal by using a first input/output characteristic before inputting the first signal into a power amplifier;
a storage module 403, configured to store the first input/output characteristic.
A sending module 404, configured to send the first signal after the predistortion processing to the power amplifier through a signal transceiver after IQ modulation.
Further, the obtaining module 401 specifically includes:
an obtaining unit 4011 configured to obtain the second input/output characteristic;
the determining unit 4012 is configured to determine a reference signal in the first communication system by querying a one-to-one correspondence between a preset input/output characteristic curve and different communication systems, where the reference signal has the third input/output characteristic;
the calculating unit 4013 is configured to calculate the first input/output characteristic according to the reference signal and the second input/output characteristic, so that the third input/output characteristic is formed after the first input/output characteristic and the second input/output characteristic are superimposed.
Further, the obtaining unit 4011 specifically includes:
a signal generating subunit, configured to generate a transmission test signal;
a transmitting subunit for transmitting the transmission test signal to the power amplifier;
the signal sampling subunit is used for acquiring the emission test signal amplified by the power amplifier;
and the signal processing subunit is configured to perform down-conversion processing on the transmission test signal amplified by the power amplifier to obtain a baseband test signal, where an input/output characteristic of the baseband test signal is the second input/output characteristic.
The method in this embodiment is applied to an electronic device including a plurality of communication paths of different communication schemes, and is different from the prior art in that the communication paths of different communication schemes share one power amplifier, and even if the power amplifier does not support a signal of a certain communication scheme, the device in this embodiment enables the signal after power amplification to meet the requirement of the communication scheme, so that the number of the power amplifiers in the electronic device can be significantly reduced, thereby facilitating the realization of an ultra-thin design of the electronic device.
The functions described in the method of the embodiment of the present application, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for processing a transmission signal is applied to an electronic device, the electronic device at least includes two communication paths, a first communication path supports a first communication system, a second communication path supports a second communication system, the first communication system is different from the second communication system, a signal of the first communication system and a signal of the second communication system share a power amplifier, and the power amplifier can cover frequency bands of the signal of the first communication system and the signal of the second communication system, and the method includes:
in the process of transmitting a first signal of a first communication system, before the first signal is input into a power amplifier, pre-distortion processing is carried out on the first signal by using first input-output characteristics;
the power amplifier does not support signals of a first communication system, has a second input-output characteristic, and forms a third input-output characteristic after the first input-output characteristic and the second input-output characteristic are superposed, wherein the third input-output characteristic meets the requirement of the first communication system on transmitting signals.
2. The method of claim 1, wherein prior to said pre-distorting said first signal using said first input-output characteristic, said method further comprises:
acquiring the first input and output characteristic;
wherein the specific process of acquiring the first input/output characteristic includes:
acquiring the second input and output characteristic;
determining a reference signal under the first communication system by inquiring a one-to-one correspondence between preset input and output characteristics and different communication systems, wherein the reference signal has the third input and output characteristics;
and calculating the first input-output characteristic according to the reference signal and the second input-output characteristic, so that the third input-output characteristic is formed after the first input-output characteristic and the second input-output characteristic are superposed.
3. The method of claim 2, wherein the obtaining the second input-output characteristic comprises:
generating a transmission test signal;
sending the transmit test signal to the power amplifier;
acquiring a transmission test signal amplified by the power amplifier;
and performing down-conversion processing on the transmission test signal amplified by the power amplifier to obtain a baseband test signal, wherein the input and output characteristics of the baseband test signal are the second input and output characteristics.
4. The method of claim 2, further comprising:
storing the first input-output characteristic.
5. The method of claim 1 or 3, further comprising:
and the first signal after the pre-distortion treatment is subjected to in-phase quadrature IQ modulation and then is sent to the power amplifier through a signal transceiver.
6. A transmission signal processing device is applied to an electronic device, the electronic device at least includes two communication paths, a first communication path supports a first communication system, a second communication path supports a second communication system, the first communication system is different from the second communication system, a signal of the first communication system and a signal of the second communication system share a power amplifier, and the power amplifier can cover frequency bands of the signal of the first communication system and the signal of the second communication system, and the transmission signal processing device includes:
the predistortion processing module is used for performing predistortion processing on a first signal of a first communication system by using a first input/output characteristic before the first signal is input into a power amplifier in the process of transmitting the first signal of the first communication system, the power amplifier does not support the signal of the first communication system and has a second input/output characteristic, a third input/output characteristic is formed after the first input/output characteristic and the second input/output characteristic are superposed, and the third input/output characteristic meets the requirement of the first communication system on transmitting the signal.
7. The apparatus of claim 6, further comprising:
an obtaining module, configured to obtain a first input/output characteristic before the predistortion processing module performs predistortion processing on the first signal by using the first input/output characteristic;
wherein, the acquisition module specifically includes:
an acquisition unit configured to acquire the second input/output characteristic;
the determining unit is used for determining a reference signal under the first communication system by inquiring the one-to-one correspondence between a preset input/output characteristic curve and different communication systems, wherein the reference signal has the third input/output characteristic;
and the calculating unit is used for calculating the first input-output characteristic according to the reference signal and the second input-output characteristic, so that the third input-output characteristic is formed after the first input-output characteristic and the second input-output characteristic are superposed.
8. The apparatus of claim 7, wherein the obtaining unit comprises:
a signal generating subunit, configured to generate a transmission test signal;
a transmitting subunit for transmitting the transmission test signal to the power amplifier;
the signal sampling subunit is used for acquiring the emission test signal amplified by the power amplifier;
and the signal processing subunit is configured to perform down-conversion processing on the transmission test signal amplified by the power amplifier to obtain a baseband test signal, where an input/output characteristic of the baseband test signal is the second input/output characteristic.
9. The apparatus of claim 7, further comprising:
and the storage module is used for storing the first input and output characteristics.
10. The apparatus of claim 6 or 8, further comprising:
and the sending module is used for sending the first signal after the pre-distortion treatment to the power amplifier through a signal transceiver after IQ modulation.
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| CN101257322A (en) * | 2006-12-06 | 2008-09-03 | 美国博通公司 | Method and system for processing signal received by communication medium |
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