CN104980384A - Signal processing method, system and device for DPD (Digital Pre-Distortion) MCPA (Multi-Carrier Power Amplifier) and MCPA - Google Patents
Signal processing method, system and device for DPD (Digital Pre-Distortion) MCPA (Multi-Carrier Power Amplifier) and MCPA Download PDFInfo
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Abstract
A signal processing method, system and device for a DPD (Digital Pre-Distortion) MCPA (Multi-Carrier Power Amplifier) and an MCPA are disclosed. The signal processing method for the DPD MCPA comprises a step of receiving a digital baseband signal of the DPD MCPA, and obtaining frequency point information of each carrier wave in the digital baseband signal after a first control signal is received; a step of performing carrier wave separation of the digital baseband signal according to the frequency point information to obtain at least two ways of carrier wave signals; performing corresponding treatment of the at least two ways of carrier wave signals, and sending the treated at least two ways of carrier wave signals to corresponding DPD processors for DPD treatment; and receiving at least two ways of feedback digital signals sent by corresponding couplers according to control of received feedback switching instructions, and sending the at least two ways of feedback digital signals to the corresponding DPD processors for serving as reference data for DPD treatment of the carrier wave signals. According to the invention, the digital baseband signal is separated into the at least two ways of carrier wave signals according to the frequency point information of each carrier wave, the correspondingly-processed carrier wave signals are output to the corresponding DPD processors for DPD treatment, and the carrier wave number of radiofrequency signals is increased without exceeding the treatment frequency band width of the DPD processor, and the data transmission speed of the base station is improved.
Description
Technical field
The present invention relates to communication technical field, particularly relate to the signal processing method of a kind of DPD MCPA, system, device and MCPA equipment.
Background technology
Along with the planning of the universal and 4G network of the high speed development, particularly 3G network of wireless communication technology and digital technology, higher requirement is proposed to data-signal transmission capacity and speed.Along with the development of digitizing technique, base station MCPA(Multi-Carrier Power Amplifier, Multi-Carrier Power Amplifier) as the core component of wireless communication system, the multiple digitizing technique of Integrated predict model.
Traditional DPD(Digital Pre-Distortion, digital pre-distortion) MCPA, first radio frequency input signal carries out down-conversion and modulus sampling processing obtains digital baseband signal, then utilizes DPD processor to carry out digital pre-distortion process to digital baseband signal, produces digital predistortion signal.Carry out to digital predistortion signal the radiofrequency signal that digital-to-analogue conversion and upconversion process obtain predistortion, power amplifier carries out power amplification to the radiofrequency signal of predistortion and obtains radio frequency output signal.Because the process frequency bandwidth by DPD processor limits, the carrier number of radio-frequency input signals can not be too much, and traditional DPD MCPA limits the carrier number of radiofrequency signal, causes base station data transmission speed low.
Summary of the invention
Based on this, be necessary for the problems referred to above, a kind of signal processing method, system, device and the MCPA equipment that improve the DPD MCPA of base station data transmission speed are provided.
A signal processing method of DPD MCPA, comprises the following steps: the digital baseband signal receiving DPD MCPA; After receiving the first control signal for controlling carrier wave separation, obtaining the frequency point information of each carrier wave in described digital baseband signal, according to described frequency point information, carrier wave separation being carried out to described digital baseband signal, obtaining at least two-way carrier signal; First peak value ALC process and average ALC process are carried out all successively to described at least two-way carrier signal; Respectively the second peak A LC process is carried out at least two-way carrier signal after carrying out described average ALC process, and be delivered to corresponding DPD processor respectively, wherein, the corresponding DPD processor of each road carrier signal; Receiving the feedback switching command for controlling to receive feedback digital signal, receiving at least two-way feedback digital signal that corresponding coupler sends respectively, and being delivered to corresponding DPD processor respectively, wherein, the corresponding coupler of each road feedback digital signal.
A signal processing system of DPD MCPA, comprising:
Receiver module, for receiving the digital baseband signal of DPD MCPA;
Carrier wave separation module, for after receiving the first control signal for controlling carrier wave separation, obtain the frequency point information of each carrier wave in described digital baseband signal, according to described frequency point information, carrier wave separation is carried out to described digital baseband signal, obtain at least two-way carrier signal;
First carrier processing module, for carrying out the first peak value ALC process and average ALC process all successively to described at least two-way carrier signal;
Second carrier processing module, for respectively to described in after carrying out described average ALC process at least two-way carrier signal carry out the second peak A LC process, and be delivered to corresponding DPD processor respectively, wherein, the corresponding DPD processor of each road carrier signal;
Feedback signal reception module, for receiving the feedback switching command for controlling to receive feedback digital signal, receiving at least two-way feedback digital signal that corresponding coupler sends respectively, and being delivered to corresponding DPD processor respectively, wherein, the corresponding coupler of each road feedback digital signal.
A signal processing apparatus of DPD MCPA, the second processor comprising first processor and be connected with described first processor,
Described first processor receives the digital baseband signal of DPD MCPA; After receiving the first control signal for controlling carrier wave separation, obtain the frequency point information of each carrier wave in described digital baseband signal; According to described frequency point information, carrier wave separation is carried out to described digital baseband signal, obtain first carrier signal and the second carrier signal, and described second carrier signal is sent to described second processor; Described first processor exports corresponding DPD processor to after carrying out the first peak value ALC process, average ALC process and the second peak A LC process successively to described first carrier signal; Export the first feedback digital signal received to corresponding DPD processor;
Described second processor exports corresponding DPD processor to after carrying out the first peak value ALC process, average ALC process and the second peak A LC process successively to described second carrier signal; Receiving the feedback switching command for controlling to receive feedback digital signal, receiving the first feedback digital signal and second feedback digital signal of the transmission of corresponding coupler respectively, and described first feedback digital signal is sent to described first processor; Described second processor exports described second feedback digital signal to corresponding DPD processor; Described first processor and the second processor be a corresponding DPD processor respectively.
A kind of MCPA equipment, comprise the signal input channel, analog to digital converter and the above-mentioned DPDMCPA signal processing apparatus that connect successively, comprise the first signal output channels and secondary signal output channel, also comprise the feedback switch, feedback down-conversion device and the feedback A/Ds that connect successively, described analog to digital converter connects the first processor of described DPD MCPA signal processing apparatus, and described feedback A/Ds connects the second processor of described DPDMCPA signal processing apparatus;
Described signal input channel comprises low-converter and I/O modulator, and low-converter is connected with described analog to digital converter by described I/O modulator; Described first signal output channels and secondary signal output channel include the DPD processor, digital to analog converter, upconverter, Multi-Carrier Power Amplifier and the coupler that are connected successively, described first signal output channels and the DPD processor in secondary signal output channel are connected first processor and second processor of described DPD MCPA signal processing apparatus respectively, and described first signal output channels is all connected with described feedback switch with the coupler in secondary signal output channel.
The signal processing method of above-mentioned DPD MCPA, system, device and MCPA equipment, receive the digital baseband signal of DPD MCPA, obtain the frequency point information of each carrier wave in digital baseband signal after receiving the first control signal.According to frequency point information, carrier wave separation is carried out to digital baseband signal, obtain at least two-way carrier signal.Respectively corresponding DPD processor is delivered to, as DPD process at least two-way carrier signal after carrying out respective handling.According to the control of the feedback switching command received, receive at least two-way feedback digital signal that corresponding coupler sends respectively, and be delivered to corresponding DPD processor respectively, be used as the reference data of carrier signal being carried out to DPD process.Digital baseband signal is separated at least two-way carrier signal by the frequency point information according to each carrier wave, and exports corresponding DPD processor after carrying out respective handling to and carry out DPD process.The basis of process frequency bandwidth not exceeding DPD processor adds the carrier number of radiofrequency signal, improves base station data transmission speed.
Accompanying drawing explanation
Fig. 1 is the flow chart of the signal processing method of DPD MCPA in an embodiment;
Fig. 2 is the flow chart of the signal processing method of DPD MCPA in another embodiment;
Fig. 3 is the structure chart of the signal processing system of DPD MCPA in an embodiment;
Fig. 4 is the structure chart of the signal processing system of DPD MCPA in another embodiment;
Fig. 5 is the structure chart of the signal processing apparatus of DPD MCPA in an embodiment;
Fig. 6 is the structure chart of MCPA equipment in an embodiment.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.Set forth a lot of detail in the following description so that fully understand the present invention.But the present invention can be much different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar improvement when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present invention understand usually.The object of term used in the description of the invention herein just in order to describe specific embodiment, is not intended to be restriction the present invention.Term as used herein " and/or " comprise arbitrary and all combinations of one or more relevant Listed Items.
A signal processing method of DPD MCPA, as shown in Figure 1, comprises the following steps:
Step S110: the digital baseband signal receiving DPD MCPA.
Digital baseband signal specifically carries out digital-to-analogue conversion by the analog to digital converter of DPD MCPA to analog if signal and obtains, and specifically receives digital baseband signal by primary processor.
Wherein in an embodiment, after step S110, before carrying out step S120, also can comprise the step of digital baseband signal being carried out to temperature-compensating.Before carrying out carrier wave separation, temperature-compensating is carried out to digital baseband signal, reduce variation of ambient temperature to the impact of signal, improve signal accuracy.
Step S120: after receiving the first control signal for controlling carrier wave separation, obtains the frequency point information of each carrier wave in digital baseband signal, carries out carrier wave separation, obtain at least two-way carrier signal according to frequency point information to digital baseband signal.
Can the first control signal be received by primary processor and carry out carrier wave separation equally.Digital baseband signal comprises multiple carrier wave, after primary processor receives the first control signal, obtains the frequency point information of each carrier wave, carries out carrier wave separation obtain at least two-way carrier signal according to frequency point information to digital baseband signal.Two-way carrier signal is obtained to be separated, can be that each carrier wave in digital baseband signal is divided into two parts by after the sequence of frequency height, obtain two-way carrier signal, reduce the distribution of the frequency of all carrier waves in the carrier signal of each road, be convenient to follow-up PDP process.Also can be that a frequency threshold value is set, the carrier wave of frequency more than frequency threshold value is divided into a road, frequency is divided into another road lower than the carrier wave of frequency threshold value.
The concrete mode that carrier wave is separated can be different because the standard of digital baseband signal is different, take digital baseband signal as WCDMA(Wideband Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) signal and LTE(Long Term Evolution, Long Term Evolution) signal is example, if digital baseband signal is WCDMA signal, after obtaining the frequency point information of signal, DDC(Digital Down Converter can be passed through, Digital Down Convert) process and the carrier wave in WCDMA signal is separated, then by DUC(Digital Up Conversion, Digital Up Convert) synthesis output.If digital baseband signal is LTE signal, because the bandwidth of signal is unknown, need multi-path choice process, Signal separator can export through the DDC process of multichannel and DUC process by signal.
Primary processor carries out carrier wave separation to digital baseband signal, can be digital baseband signal is separated into two-way carrier signal, also can be three roads or the carrier signal more than three tunnels, and being specifically separated into a few road can adjust according to actual conditions.
Step S130: the first peak value ALC process and average ALC process are carried out all successively at least two-way carrier signal.
ALC(Automatic Level Control, auto level control) process is for due to device change itself, environment causes working point change etc. to carry out stable level process, corrects the numerical value that the level offset gets back to setting.Namely first peak value ALC process is carry out ALC to the peak value of carrier signal to correct process, namely average ALC process is carry out correction process to the average of carrier signal, be appreciated that different carrier signals, the standard of carrying out the first peak value ALC process and average ALC process also can be different.
Specifically can be processed at least two-way carrier signal by primary processor and coordinating from processor.From the quantity of processor and the way of carrier signal corresponding, as carrier signal be two-way time, be 1 from processor quantity, primary processor and rush processor and respectively a road carrier signal is processed; If carrier signal is three tunnels, be 2 from the quantity of processor, primary processor and rush processor and respectively a road carrier signal is processed.Primary processor and all can adopt FPGA(Field-Programmable Gate Array, field programmable gate array from processor) chip.
Step S140: carry out the second peak A LC process to carrying out at least two-way carrier signal after average ALC process respectively, and be delivered to corresponding DPD processor respectively.
The corresponding DPD processor of each road carrier signal.Can be processed at least two-way carrier signal by primary processor and coordinating from processor equally, from the quantity of processor and the quantity of carrier signal corresponding.Average is carried out again to the carrier signal after average ALC process and corrects process, be then sent to corresponding DPD processor and be used as DPD process.In like manner, to different carrier signals, the standard of the second peak A LC process is different.
Further, corresponding DPD processor is delivered to after also can carrying out equilibrium treatment at least two-way carrier signal after the second peak A LC process again.Specifically can respectively by the primary processor of correspondence with carry out equilibrium treatment from processor to signal, the yield value of the carrier wave of adjustment different frequent points, improves signal accuracy.
Wherein in an embodiment, after step S130, before step S140, the signal processing method of DPD MCPA also can comprise after carrying out average ALC process and peak value carries out the step of peak clipping process higher than the carrier signal of corresponding preset value.
For primary processor, digital baseband signal is separated into two-way carrier signal equally, after primary processor Dui mono-tunnel carrier signal carries out average ALC process, judge that whether the peak value of the signal after processing is higher than corresponding preset value, corresponding preset value can adjust according to the difference of the signal of process.If the signal peak after average ALC process is higher than corresponding preset value, primary processor carries out peak clipping process to it, reduces the peak-to-average force ratio of signal, improves the operational efficiency of DPD MCPA subsequent treatment.
After average ALC process being carried out to another road carrier signal from processor, judge that whether the peak value of the signal after processing is higher than corresponding preset value, if then carry out peak clipping process to it, reduces the peak-to-average force ratio of signal.Be appreciated that primary processor with from processor for judge whether to carrier signal carry out peak clipping process corresponding preset value can identical also can be different.
Wherein in an embodiment, the signal processing method of DPD MCPA also can comprise the forward direction switching command received for controlling power detection, the carrier signal after digital baseband signal, the first peak value ALC carrier signal before treatment and the second peak A LC process is carried out to the step of power detection.
Particularly, for primary processor, digital baseband signal is separated into two-way carrier signal, forward direction switching command can be sent to primary processor with from processor, primary processor adopts time division multiplexing mode to digital baseband signal according to forward direction switching command, and carries out power detection by the carrier signal after primary processor carries out the second peak A LC process.Time division multiplexing mode is adopted to carry out power detection to the carrier signal before the first peak value ALC process and after the second peak A LC process from processor according to forward direction switching command.
Namely be primary processor in the present embodiment and carry out all having carried out power detection before process and after process to respective signal from processor, in real time power monitoring is carried out to the signal of input and output.Primary processor and can adjusting corresponding signal transacting standard according to the power data detected from processor, improves signal transacting accuracy further.Be appreciated that in other embodiments, also can not have carried out power detection to the signal before process and after process, primary processor and all according to default standard, respective handling is carried out to signal from processor.
Step S180: receiving the feedback switching command for controlling to receive feedback digital signal, receiving at least two-way feedback digital signal that corresponding coupler sends respectively, and being delivered to corresponding DPD processor respectively.
Feedback digital signal is that the radio frequency output signal that corresponding coupler exports from MCPA carries out the signal obtained of sampling, the corresponding coupler of each road feedback digital signal.Feedback switching command can be received by from processor, receive feedback digital signal, the feedback digital signal of reception be separated in step S120 that the carrier signal obtained is corresponding and quantity is identical.Take feedback digital signal as two-way be example, two-way feedback digital signal is accessed by the same port from processor, from processor according to feedback switching command, time division multiplexing mode is adopted to receive feedback digital signal, as received a wherein road feedback digital signal when feedback switching command is high level, receive another road feedback digital signal when feedback switching command is low level.
The carrier signal exported by primary processor in step S120 can be called first via carrier signal at this, the feedback digital signal corresponding with first via carrier signal is called first via feedback signal, is called the second tunnel carrier signal and the second tunnel feedback signal by the carrier signal exported from processor and feedback digital signal corresponding with it.From processor, first via feedback signal is delivered to the DPD processor receiving first via carrier signal through primary processor, as DPD processor, first via carrier signal is carried out to the reference data of DPD process.From processor, the second tunnel feedback signal is delivered to the DPD processor of reception second tunnel carrier signal, as DPD processor, the second tunnel carrier signal is carried out to the reference data of DPD process.
If feedback digital signal is more than three tunnels, can be receive feedback digital signal from processor, respectively through the primary processor of correspondence or be sent to corresponding DPD processor from processor.
Wherein in an embodiment, also can be sent to corresponding DPD processor after carrying out temperature-compensating again at least two-way feedback digital signal, reduce variation of ambient temperature to the impact of signal, improve signal accuracy.
Wherein in an embodiment, after step S180, the signal processing method of DPD MCPA also can comprise and all carries out Digital Down Convert process at least two-way feedback digital signal, and carries out the step of power detection to the signal obtained after digital down-converted.Digital Down Convert process can be carried out by primary processor with from processor to feedback digital signal equally, and power detection is carried out to the signal obtained after digital down-converted.
The signal processing method of above-mentioned DPD MCPA, receives the digital baseband signal of DPD MCPA, obtains the frequency point information of each carrier wave in digital baseband signal after receiving the first control signal.According to frequency point information, carrier wave separation is carried out to digital baseband signal, obtain at least two-way carrier signal.Respectively corresponding DPD processor is delivered to, as DPD process at least two-way carrier signal after carrying out respective handling.According to the control of the feedback switching command received, receive at least two-way feedback digital signal that corresponding coupler sends respectively, and be delivered to corresponding DPD processor respectively, be used as the reference data of carrier signal being carried out to DPD process.Digital baseband signal is separated at least two-way carrier signal by the frequency point information according to each carrier wave, and exports corresponding DPD processor after carrying out respective handling to and carry out DPD process.The basis of process frequency bandwidth not exceeding DPD processor adds the carrier number of radiofrequency signal, improves base station data transmission speed.
Wherein in an embodiment, as shown in Figure 2, after step S110, the signal processing method of DPD MCPA is further comprising the steps of:
Step S150: after receiving the second control signal be separated for control signal, obtains the signaling mode data of digital baseband signal, carries out Signal separator, obtain at least two-way standard signal according to signaling mode data to digital baseband signal.
Can the second control signal be received by primary processor and carry out Signal separator equally.When digital baseband signal comprises the signal of multiple different systems, send second and control signal to primary processor, primary processor obtains the signaling mode data of digital baseband signal, carries out Signal separator according to signaling mode data to digital baseband signal.The quantity of the standard signal obtained also can adjust according to actual conditions, if digital baseband signal comprises the signal of two kinds of standards, according to signaling mode data, digital baseband signal can be separated into two-way standard signal.If digital baseband signal comprises the signal of more than three kinds standards, primary processor can be the signal of each standard is all separated become a road standard signal, also can be that the Signal separator of two or more standards wherein is out formed a road standard signal.
Step S160: the first peak value ALC process and average ALC process are carried out all successively at least two-way standard signal.Concrete and step S130 is similar, do not repeat them here.
Step S170: carry out the second peak A LC process to carrying out at least two-way standard signal after average ALC process respectively, and be delivered to corresponding DPD processor respectively.Concrete and step S140 is similar, do not repeat them here.
Equally, after also can carrying out equilibrium treatment at least two-way standard signal after the second peak A LC process, be delivered to corresponding DPD processor again, improve signal accuracy.
Wherein in an embodiment, after step S160, before step S170, the signal processing method of DPD MCPA also can comprise after carrying out average ALC process and peak value carries out the step of peak clipping process higher than the standard signal of corresponding set point, reduces the peak-to-average force ratio of signal.Concrete mode and aforementioned to carry out the step of peak clipping process to carrier signal similar, does not repeat them here.For judge whether to carrier signal carry out peak clipping process corresponding preset value can identical also can be different.
Wherein in an embodiment, the signal processing method of DPD MCPA also can comprise the step that the standard signal after to the first peak value ALC standard signal before treatment and the second peak A LC process carries out power detection, carries out power monitoring in real time to the signal of input and output.Concrete mode and aforementioned to carry out the step of power detection to carrier signal similar, does not repeat them here.
Namely step S150 to step S170 there is provided another kind of signal processing mode, obtains and according to the signaling mode data of digital baseband signal, digital baseband signal is separated at least two-way standard signal after receiving the second control signal.Corresponding DPD processor is delivered to, as DPD process at least two-way standard signal after carrying out respective handling.Be appreciated that owing to not receiving the first control signal, do not carry out step S120 to step 140.Now at least two-way feedback digital signal is delivered to the DPD processor receiving corresponding standard signal by step S180.
Combining step S110 is to step S180, namely there is provided two kinds of signal processing modes of operation, user can carry the first control signal or second to control signal to primary processor according to actual conditions, controlling primary processor and digital baseband signal is separated into carrier signal or standard signal, being delivered to corresponding DPD processor to being separated after the signal obtained processes.Digital baseband signal is separated into two paths of signals with primary processor comparatively in specific embodiment by one equally wherein, primary processor and be treated to example to a road signal respectively from processor, and the signal processing method of DPD MCPA comprises the following steps:
Primary processor receives the digital baseband signal of DPD MCPA and carries out temperature-compensating to it, and after receiving the first control signal, digital baseband signal is separated into two-way carrier signal, after receiving the second control signal, digital baseband signal is separated into two-way standard signal.Primary processor is sent to being separated the two paths of signals Zhong mono-road signal obtained from processor.
Primary processor carries out the first peak value ALC process and average ALC process successively to another road signal, if the peak value of average ALC process Hou Gai road signal is higher than corresponding threshold value, peak clipping process is carried out to it, after then carrying out the second peak A LC process and equilibrium treatment, is delivered to corresponding DPD processor again.Primary processor receives forward direction switching command, carries out power detection to the signal after digital baseband signal and the second peak A LC process.
From processor, the first peak value ALC process and average ALC process are carried out to the signal that primary processor sends, if the peak value of average ALC process Hou Gai road signal is higher than corresponding threshold value, peak clipping process is carried out to it, after then carrying out the second peak A LC process and equilibrium treatment, is delivered to corresponding DPD processor again.Receive forward direction switching command from processor, power detection is carried out to the signal before the first peak value ALC process and after the second peak A LC process.
From processor according to feedback switching command, time division multiplexing mode is adopted to receive the two-way feedback digital signal of corresponding coupler transmission, one tunnel feedback digital signal is sent to primary processor, and primary processor is delivered to corresponding DPD processor after carrying out temperature-compensating to feedback digital signal.Another corresponding DPD processor is delivered to after processor carries out temperature-compensating to another road feedback digital signal.Primary processor and also Digital Down Convert process is carried out to the feedback digital signal of correspondence from processor, and power detection is carried out to the signal obtained after digital down-converted.
A signal processing system of DPD MCPA, as shown in Figure 3, comprises receiver module 110, carrier wave separation module 120, first carrier processing module 130, second carrier processing module 140 and feedback signal reception module 180.
Receiver module 110 is for receiving the digital baseband signal of DPD MCPA.
Digital baseband signal specifically carries out digital-to-analogue conversion by the analog to digital converter of DPD MCPA to analog if signal and obtains.Wherein in an embodiment, receiver module 110 also can carry out temperature-compensating to digital baseband signal, reduces variation of ambient temperature to the impact of signal, improves signal accuracy.
Carrier wave separation module 120, for after receiving the first control signal for controlling carrier wave separation, obtaining the frequency point information of each carrier wave in digital baseband signal, carrying out carrier wave separation, obtain at least two-way carrier signal according to frequency point information to digital baseband signal.
Digital baseband signal comprises multiple carrier wave, after carrier wave separation module 120 receives the first control signal, obtains the frequency point information of each carrier wave, carries out carrier wave separation obtain at least two-way carrier signal according to frequency point information to digital baseband signal.Embodiment and step S120 similar, therefore not to repeat here.
First carrier processing module 130 is for carrying out the first peak value ALC process and average ALC process all successively at least two-way carrier signal.Concrete and step S130 is similar, therefore not to repeat here.
Second carrier processing module 140 for carrying out the second peak A LC process to carrying out at least two-way carrier signal after average ALC process respectively, and is delivered to corresponding DPD processor respectively.
The corresponding DPD processor of each road standard signal.The operation principle that second carrier processing module 140 is concrete and step S140 similar, therefore not to repeat here.
Further, the signal processing system of DPD MCPA also can comprise the 3rd carrier processing module, 3rd carrier processing module is after the first processing module 130 carries out average ALC process, before second carrier processing module 140 carries out the second peak A LC process, to carry out after average ALC process and peak value carries out peak clipping process higher than the carrier signal of corresponding preset value.3rd carrier processing module carries out concrete principle and the aforementioned primary processor of peak clipping process and to carry out peak clipping process from processor similar, and therefore not to repeat here.
Wherein in an embodiment, the second carrier processing module 140 is delivered to corresponding DPD processor again after also can carrying out equilibrium treatment to the signal after the second peak A LC process.Equilibrium treatment is carried out to signal, improves signal accuracy.Concrete with aforementioned primary processor with to carry out equilibrium treatment from processor to signal similar, therefore not to repeat here.
In addition, the second carrier processing module 140 also can receive the forward direction switching command for controlling power detection, carries out power detection to the carrier signal after digital baseband signal, the first peak value ALC carrier signal before treatment and the second peak A LC process.Concrete with aforementioned primary processor with to carry out power detection from processor to corresponding signal similar, therefore not to repeat here.
Feedback signal reception module 180, for receiving the feedback switching command for controlling to receive feedback digital signal, receiving at least two-way feedback digital signal that corresponding coupler sends respectively, and being delivered to corresponding DPD processor respectively.
Feedback digital signal is that the radio frequency output signal that corresponding coupler exports from MCPA carries out the signal obtained of sampling, the corresponding coupler of each road feedback digital signal.The operation principle of feedback signal reception module 180 is concrete and step S180 is similar, does not repeat them here.
Feedback signal reception module 180 also can be sent to corresponding DPD processor at least two-way feedback digital signal again after carrying out temperature-compensating, reduce variation of ambient temperature to the impact of signal, improve signal accuracy.
Wherein in an embodiment, feedback signal reception module 180 also can be used for all carrying out Digital Down Convert process at least two-way feedback digital signal, and power detection is carried out to the signal obtained after digital down-converted, same and primary processor and to carry out power detection from processor to corresponding signal similar, therefore not to repeat here.
The signal processing system of above-mentioned DPD MCPA, receiver module 110 receives the digital baseband signal of DPD MCPA, and carrier wave separation module 120 obtains the frequency point information of each carrier wave in digital baseband signal after receiving the first control signal.According to frequency point information, carrier wave separation is carried out to digital baseband signal, obtain at least two-way carrier signal.First carrier processing module 130 and the second carrier processing module 140 are delivered to corresponding DPD processor, as DPD process at least two-way carrier signal respectively after carrying out respective handling.Feedback signal reception module 180, according to the control of the feedback switching command received, receives at least two-way feedback digital signal that corresponding coupler sends respectively, and is delivered to corresponding DPD processor respectively, is used as the reference data of carrier signal being carried out to DPD process.Digital baseband signal is separated at least two-way carrier signal by the frequency point information according to each carrier wave, and exports corresponding DPD processor after carrying out respective handling to and carry out DPD process.The basis of process frequency bandwidth not exceeding DPD processor adds the carrier number of radiofrequency signal, improves base station data transmission speed.
Wherein in an embodiment, as shown in Figure 4, the signal processing system of DPD MCPA also comprises signal separation module 150, first signal processing module 160 and secondary signal processing module 170.
Signal separation module 150, for after receiving the second control signal be separated for control signal, obtains the signaling mode data of digital baseband signal, carries out Signal separator, obtain at least two-way standard signal according to signaling mode data to digital baseband signal.Concrete and step S150 is similar, do not repeat them here.
First signal processing module 160 is for carrying out the first peak value ALC process and average ALC process all successively at least two-way standard signal.Concrete and step S160 is similar, do not repeat them here.
Secondary signal processing module 170 for carrying out the second peak A LC process to carrying out at least two-way standard signal after average ALC process respectively, and is delivered to corresponding DPD processor respectively.Concrete and step S170 is similar, do not repeat them here.
Further, the signal processing system of DPD MCPA also can comprise the 3rd signal processing module, 3rd signal processing module is used for after the first signal processing module 160 carries out average ALC process, before secondary signal processing module 170 carries out the second peak A LC process, to carry out after average ALC process and peak value carries out peak clipping process higher than the standard signal of corresponding set point.
Wherein in an embodiment, secondary signal processing module 170 is delivered to corresponding DPD processor again after can carrying out equilibrium treatment to the signal after the second peak A LC process equally, improves signal accuracy.In addition, secondary signal processing module 170 also can receive the forward direction switching command for controlling power detection, carries out power detection to the carrier signal after digital baseband signal, the first peak value ALC carrier signal before treatment and the second peak A LC process.
Namely signal separation module 150, first signal processing module 160 and secondary signal processing module 170 there is provided another kind of signal processing mode, obtain and according to the signaling mode data of digital baseband signal, digital baseband signal is separated at least two-way standard signal after receiving the second control signal.Corresponding DPD processor is delivered to, as DPD process at least two-way standard signal after carrying out respective handling.Be appreciated that owing to not receiving the first control signal, carrier wave separation module 120, first carrier processing module 130 and the second carrier processing module 140 do not work.Now at least two-way feedback digital signal is delivered to the DPD processor receiving corresponding standard signal by feedback signal reception module 180.
A signal processing apparatus of DPD MCPA, as shown in Figure 5, comprise first processor 210 and the second processor 220, first processor 210 connects the second processor 220.In the present embodiment, first processor 210 connects the second processor 220 and all adopts fpga chip.
First processor 210 receives the digital baseband signal of DPD MCPA; After receiving the first control signal for controlling carrier wave separation, obtain the frequency point information of each carrier wave in digital baseband signal; According to frequency point information, carrier wave separation is carried out to digital baseband signal, obtain first carrier signal and the second carrier signal, and the second carrier signal is sent to the second processor.First processor 210 pairs of first carrier signals export corresponding DPD processor to after carrying out the first peak value ALC process, average ALC process and the second peak A LC process successively.
Second processor 220 exports corresponding DPD processor to after carrying out the first peak value ALC process, average ALC process and the second peak A LC process successively to the second carrier signal; Receiving the feedback switching command for controlling to receive feedback digital signal, receiving the first feedback digital signal and second feedback digital signal of the transmission of corresponding coupler respectively, and the first feedback digital signal is sent to first processor 210.First processor 210 exports the first feedback digital signal to corresponding DPD processor, and the second processor 220 exports the second feedback digital signal to corresponding DPD processor.
First processor 210 and the second processor 220 be a corresponding DPD processor respectively, and namely first processor 210 is connected with a DPD processor respectively with the second processor 220.First processor 210 is by the first carrier signal after the second peak A LC process, and the first feedback digital signal received is sent to same DPD processor, second processor 220 is by the second carrier signal after the second peak A LC process, and the second feedback digital signal received is sent to same DPD processor.
The embodiment of the above-mentioned functions of first processor 210 and the second processor 220 and aforementioned primary processor and similar from the operation principle of processor, do not repeat them here.
First processor 210 and the second processor 220 after carrying out average ALC process to carrier signal, before carrying out the second peak A LC process, can carry out peak clipping process to peak value higher than the carrier signal of corresponding preset value.First processor 210 and the second processor 220 are delivered to corresponding DPD processor after also can carrying out equilibrium treatment to the carrier signal after carrying out the second peak A LC process again.First processor 210 and the second processor 220 are sent to corresponding DPD processor again after also can carrying out temperature-compensating to feedback digital signal, reduce variation of ambient temperature to the impact of signal, improve precision.First processor 210 and the second processor 220 also at least two-way feedback digital signal all can carry out Digital Down Convert process in addition, and carry out power detection to the signal obtained after digital down-converted.
In addition, first processor 210 before carrying out carrier wave separation to digital baseband signal, can carry out temperature-compensating to digital baseband signal; Also can receive the forward direction switching command for controlling power detection, power detection is carried out to the first carrier signal after digital baseband signal and the second peak A LC process.Second processor 220 also can receive the forward direction switching command for controlling power detection, carries out power detection to the second carrier signal before the first peak value ALC process and after the second peak A LC process.
The signal processing apparatus of above-mentioned DPD MCPA, first processor 210 and the second processor 220 pairs of digital baseband signals carry out Signal separator and obtain two-way carrier signal, and export corresponding DPD processor after carrying out respective handling to, as DPD process; And receive the two-way feedback digital signal of corresponding coupler transmission, and be delivered to corresponding DPD processor respectively, be used as the reference data of carrier signal being carried out to DPD process.Digital baseband signal is separated into two-way carrier signal by the frequency point information according to each carrier wave, and exports corresponding DPD processor after carrying out respective handling to and carry out DPD process.The basis of process frequency bandwidth not exceeding DPD processor adds the carrier number of radiofrequency signal, improves base station data transmission speed.
Wherein in an embodiment, first processor 210, after receiving the second control signal be separated for control signal, obtains the signaling mode data of digital baseband signal; According to signaling mode data, Signal separator is carried out to digital baseband signal, obtain the first standard signal and the second standard signal, and the second standard signal is sent to the second processor 220.First processor 210 exports corresponding DPD processor to after carrying out the first peak value ALC process, average ALC process and the second peak A LC process successively to the first standard signal.
Second processor 220 exports corresponding DPD processor to after carrying out the first peak value ALC process, average ALC process and the second peak A LC process successively to the second standard signal.
First processor 210 and the second processor 220 can after carrying out average ALC process to standard signal, before carrying out the second peak A LC process, carry out peak clipping process to peak value higher than the standard signal of corresponding preset value.First processor 210 and the second processor 220 are delivered to corresponding DPD processor after also can carrying out equilibrium treatment to the standard signal after carrying out the second peak A LC process again.
Namely be that first processor 210 and the second processor 220 provide another kind of signal processing mode in the present embodiment, obtain after receiving the second control signal and according to the signaling mode data of digital baseband signal, digital baseband signal be separated into two-way standard signal.Corresponding DPD processor is delivered to, as DPD process after respective handling is carried out to two-way standard signal.
First processor 210 carries out two kinds of mode of operations switchings with the second processor 220 according to the control signal received is different.Upon receiving the first control signal, digital baseband signal being separated into two-way carrier signal, when receiving the second control signal, digital baseband signal being separated into two-way standard signal.First processor 210 is sent to corresponding DPD processor with the second processor 220 respectively by being separated the two paths of signals obtained, and the two-way feedback digital signal of reception is also sent to corresponding DPD processor respectively.
In addition, first processor 210 and the second processor 220 also can carry out the similar process of other and carrier signal to standard signal, and therefore not to repeat here.
Present invention also offers a kind of MCPA equipment, as shown in Figure 6, comprise the signal input channel 310, analog to digital converter 320 and the above-mentioned DPD MCPA signal processing apparatus 200 that connect successively, comprise the first signal output channels 330 and secondary signal output channel 340, also comprise the feedback switch 350, feedback down-conversion device 360 and the feedback A/Ds 370 that connect successively, analog to digital converter 320 connects the first processor 210 of DPD MCPA signal processing apparatus 200, and feedback A/Ds 370 connects the second processor 220 of DPD MCPA signal processing apparatus 200.
Signal input channel 310 comprises low-converter 312 and I/O modulator 314, and low-converter 312 is connected with analog to digital converter 320 by I/O modulator 314.Low-converter 312 received RF input signal, radio frequency input signal carries out down-converted and obtains analog if signal, and is sent to I/O modulator 314.Analog to digital converter 320 is sent to after I/O modulator 314 pairs of analog if signals carry out I/O modulation.The quantity of signal input channel 310 can be one also can be multiple.
Analog to digital converter 320 carries out analog-to-digital conversion to the signal received, and obtains digital baseband signal and is sent to first processor 210.If the quantity of signal input channel 310 is multiple, analog to digital converter 320 can adopt time division multiplexing mode to carry out analog-to-digital conversion to the signal that multiple signal input channel 310 sends equally.In the present embodiment, analog to digital converter 320 can be the analog to digital converter successively comparing type, and conversion speed is fast, precision is high, reduces the distorted signals that AD conversion causes.
First signal output channels 330 comprises the DPD processor 331, digital to analog converter 332, upconverter 333, Multi-Carrier Power Amplifier 334 and the coupler 335 that connect successively, and secondary signal output channel 340 comprises the DPD processor 341, digital to analog converter 342, upconverter 343, Multi-Carrier Power Amplifier 344 and the coupler 345 that connect successively.In first signal output channels 330, DPD processor 331 connects the first processor 210 of DPDMCPA signal processing apparatus 200, and coupler 335 is connected with feedback switch 350.In secondary signal output channel 350, DPD processor 351 connects the second processor 220 of DPD MCPA signal processing apparatus 200, and coupler 345 is connected with feedback switch 350.
When the quantity of signal input channel 310 is one, user sends first and controls signal to after digital baseband signal is separated into two-way carrier signal by first processor 210, DPD MCPA signal processing apparatus 200 and be sent to DPD processor 331 and DPD processor 341 respectively.When the quantity of signal input channel 310 is multiple, user sends second and controls signal to after digital baseband signal is separated into two-way standard signal by first processor 210, DPD MCPA signal processing apparatus 200 and be sent to DPD processor 331 and DPD processor 341 respectively.
Receive the first carrier/standard signal after respective handling of first processor 210 transmission for the first signal output channels 330, DPD processor 331, and the second processor 220 receives and the first feedback digital signal sent through first processor 210.DPD processor 331 carries out pre-distortion according to the first feedback digital signal to first carrier/standard signal, obtains digital predistortion signal and is sent to digital to analog converter 332.
Digital to analog converter 332 pairs of digital predistortion signal carry out digital-to-analogue conversion process, obtain the analog if signal after predistortion and are sent to upconverter 333.In the present embodiment, digital to analog converter 332 can be the digital to analog converter of current-output type, and conversion accuracy is higher, improves the linear index of output signal.
Analog if signal after upconverter 333 pairs of predistortions carries out upconversion process, obtains and exports predistortion RF signal to Multi-Carrier Power Amplifier 334.
Multi-Carrier Power Amplifier 334 pairs of predistortion RF signals carry out amplification process, obtain the first radio frequency output signal and export through coupler 335.In the present embodiment, Multi-Carrier Power Amplifier 334 is HEPA(High-Efficiency Power Amplifier, high efficiency power amplifier), adopt dynamic load traction technique, make power amplifier still can keep higher efficiency when high average power rollback.
Similar in the operation principle of each parts in secondary signal output channel 340 and concrete type of device and the first signal output channels 330, repeat no more.The second radio frequency output signal that Multi-Carrier Power Amplifier 344 obtains exports through coupler 345.
Coupler 335 and coupler 345 are sampled to the radio frequency output signal that Multi-Carrier Power Amplifier 334 and Multi-Carrier Power Amplifier 344 export respectively, obtain a part for two-way radio frequency output signal as the first feedback radiofrequency signal and the second feedback radiofrequency signal, and be sent to feedback switch 350.
Feedback switch 350 same employing time division multiplexing mode accesses the first feedback radiofrequency signal and second respectively and feeds back radiofrequency signal to feedback down-conversion device 360.
Feedback down-conversion device 360 carries out down-converted to the first feedback radiofrequency signal and the second feedback radiofrequency signal, obtains the first feedback intermediate-freuqncy signal and the second feedback intermediate-freuqncy signal, and is sent to feedback A/Ds 370.
Feedback A/Ds 370 carries out analog-to-digital conversion to the first feedback intermediate-freuqncy signal and the second feedback intermediate-freuqncy signal, obtains the first feedback digital signal and the second feedback digital signal, and is sent to the second processor 220 of DPD MCPA signal processing apparatus 200.In the present embodiment, feedback A/Ds 370 can be the analog to digital converter successively comparing type equally, and conversion speed is fast, precision is high, reduces the distorted signals that AD conversion causes.
The first feedback digital signal received is sent to DPD processor 331 through first processor 210 by the second processor 220, and the first carrier/standard signal after respective handling as 331 pairs of first processors 210 transmissions of DPD processor carries out the reference data of DPD process.The second feedback digital signal received is sent to DPD processor 341 by the second processor 220, as DPD processor 341, the second carrier wave after respective handling/standard signal that second processor 220 sends is carried out to the reference data of DPD process.
Above-mentioned MCPA equipment, the signal obtained, after signal input channel 310 processes, is sent to analog to digital converter 320 by the radio-frequency input signals of access.Analog to digital converter 320 carries out analog-to-digital conversion to the signal received, and obtains digital baseband signal and is sent to DPD MCPA signal processing apparatus 200.DPD MCPA signal processing apparatus 200 carries out separation according to the control signal received to digital baseband signal and obtains two-way carrier wave/standard signal, is respectively sent to first signal output channels 330 and secondary signal output channel 340 after carrying out respective handling to two-way carrier wave/standard signal.Feedback switch 350 switch-in coupler 335 and coupler 345 sample obtain first feedback radiofrequency signal and second feedback radiofrequency signal, process successively through feedback down-conversion device 360 and feedback A/Ds 370 and obtain the first feedback digital signal and the second feedback digital signal, carry out the reference data of DPD process as DPD processor 331 and DPD processor 341.Digital baseband signal is separated into two paths of signals by the frequency point information according to each carrier wave, and exports corresponding DPD processor after carrying out respective handling to and carry out DPD process.The basis of process frequency bandwidth not exceeding DPD processor adds the carrier number of radiofrequency signal, improves base station data transmission speed.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (11)
1. a signal processing method of DPD MCPA, is characterized in that, comprises the following steps:
Receive the digital baseband signal of DPD MCPA;
After receiving the first control signal for controlling carrier wave separation, obtaining the frequency point information of each carrier wave in described digital baseband signal, according to described frequency point information, carrier wave separation being carried out to described digital baseband signal, obtaining at least two-way carrier signal;
First peak value ALC process and average ALC process are carried out all successively to described at least two-way carrier signal;
Respectively the second peak A LC process is carried out at least two-way carrier signal after carrying out described average ALC process, and be delivered to corresponding DPD processor respectively, wherein, the corresponding DPD processor of each road carrier signal;
Receiving the feedback switching command for controlling to receive feedback digital signal, receiving at least two-way feedback digital signal that corresponding coupler sends respectively, and being delivered to corresponding DPD processor respectively, wherein, the corresponding coupler of each road feedback digital signal.
2. the signal processing method of DPD MCPA according to claim 1, it is characterized in that, after described average ALC process, before carrying out described second peak A LC process, also comprise to carry out after described average ALC process and peak value carries out the step of peak clipping process higher than the carrier signal of corresponding preset value.
3. the signal processing method of DPD MCPA according to claim 1, is characterized in that, after receiving described digital baseband signal, further comprising the steps of:
After receiving the second control signal be separated for control signal, obtain the signaling mode data of described digital baseband signal, according to described signaling mode data, Signal separator is carried out to described digital baseband signal, obtain at least two-way standard signal;
Described first peak value ALC process and average ALC process are carried out all successively to described at least two-way standard signal;
Respectively described second peak A LC process is carried out at least two-way standard signal after carrying out described average ALC process, and be delivered to corresponding DPD processor respectively, wherein, the corresponding DPD processor of each road standard signal.
4. the signal processing method of DPD MCPA according to claim 3, it is characterized in that, after described average ALC process, before carrying out described second peak A LC process, also comprise to carry out after described average ALC process and peak value carries out the step of peak clipping process higher than the standard signal of corresponding set point.
5. a signal processing system of DPD MCPA, is characterized in that, comprising:
Receiver module, for receiving the digital baseband signal of DPD MCPA;
Carrier wave separation module, for after receiving the first control signal for controlling carrier wave separation, obtain the frequency point information of each carrier wave in described digital baseband signal, according to described frequency point information, carrier wave separation is carried out to described digital baseband signal, obtain at least two-way carrier signal;
First carrier processing module, for carrying out the first peak value ALC process and average ALC process all successively to described at least two-way carrier signal;
Second carrier processing module, for respectively to described in after carrying out described average ALC process at least two-way carrier signal carry out the second peak A LC process, and be delivered to corresponding DPD processor respectively, wherein, the corresponding DPD processor of each road carrier signal;
Feedback signal reception module, for receiving the feedback switching command for controlling to receive feedback digital signal, receiving at least two-way feedback digital signal that corresponding coupler sends respectively, and being delivered to corresponding DPD processor respectively, wherein, the corresponding coupler of each road feedback digital signal.
6. the signal processing system of DPD MCPA according to claim 5, is characterized in that, also comprises the 3rd carrier processing module,
Described 3rd carrier processing module is used for after described first processing module carries out described average ALC process, before described second processing module carries out described second peak A LC process, to carry out after described average ALC process and peak value carries out peak clipping process higher than the carrier signal of corresponding preset value.
7. the signal processing system of DPD MCPA according to claim 5, is characterized in that, also comprise:
Signal separation module, for after receiving the second control signal be separated for control signal, obtain the signaling mode data of described digital baseband signal, according to described signaling mode data, Signal separator is carried out to described digital baseband signal, obtain at least two-way standard signal;
First signal processing module, for carrying out described first peak value ALC process and average ALC process all successively to described at least two-way standard signal;
Secondary signal processing module, for carrying out described second peak A LC process at least two-way standard signal after carrying out described average ALC process respectively, and is delivered to corresponding DPD processor respectively, wherein, and the corresponding DPD processor of each road standard signal.
8. the signal processing system of DPD MCPA according to claim 7, is characterized in that, also comprises the 3rd signal processing module,
Described 3rd signal processing module is used for after described first signal processing module carries out described average ALC process, before described secondary signal processing module carries out described second peak A LC process, to carry out after described average ALC process and peak value carries out peak clipping process higher than the standard signal of corresponding set point.
9. a signal processing apparatus of DPD MCPA, is characterized in that, the second processor comprising first processor and be connected with described first processor,
Described first processor receives the digital baseband signal of DPD MCPA; After receiving the first control signal for controlling carrier wave separation, obtain the frequency point information of each carrier wave in described digital baseband signal; According to described frequency point information, carrier wave separation is carried out to described digital baseband signal, obtain first carrier signal and the second carrier signal, and described second carrier signal is sent to described second processor; Described first processor exports corresponding DPD processor to after carrying out the first peak value ALC process, average ALC process and the second peak A LC process successively to described first carrier signal; Export the first feedback digital signal received to corresponding DPD processor;
Described second processor exports corresponding DPD processor to after carrying out the first peak value ALC process, average ALC process and the second peak A LC process successively to described second carrier signal; Receiving the feedback switching command for controlling to receive feedback digital signal, receiving the first feedback digital signal and second feedback digital signal of the transmission of corresponding coupler respectively, and described first feedback digital signal is sent to described first processor; Described second processor exports described second feedback digital signal to corresponding DPD processor; Described first processor and the second processor be a corresponding DPD processor respectively.
10. the signal processing apparatus of DPD MCPA according to claim 9, is characterized in that,
Described first processor, after receiving the second control signal be separated for control signal, obtains the signaling mode data of described digital baseband signal; According to described signaling mode data, Signal separator is carried out to described digital baseband signal, obtain the first standard signal and the second standard signal, and described second standard signal is sent to described second processor; Described first processor exports corresponding DPD processor to after carrying out described first peak value ALC process, average ALC process and the second peak A LC process successively to described first standard signal;
Described second processor exports corresponding DPD processor to after carrying out described first peak value ALC process, average ALC process and the second peak A LC process successively to described second standard signal.
11. 1 kinds of MCPA equipment, it is characterized in that, comprise the signal input channel, analog to digital converter and the DPD MCPA signal processing apparatus described in claim 9 to 10 any one that connect successively, comprise the first signal output channels and secondary signal output channel, also comprise the feedback switch, feedback down-conversion device and the feedback A/Ds that connect successively, described analog to digital converter connects the first processor of described DPD MCPA signal processing apparatus, and described feedback A/Ds connects the second processor of described DPD MCPA signal processing apparatus;
Described signal input channel comprises low-converter and I/O modulator, and low-converter is connected with described analog to digital converter by described I/O modulator; Described first signal output channels and secondary signal output channel include the DPD processor, digital to analog converter, upconverter, Multi-Carrier Power Amplifier and the coupler that are connected successively, described first signal output channels and the DPD processor in secondary signal output channel are connected first processor and second processor of described DPDMCPA signal processing apparatus respectively, and described first signal output channels is all connected with described feedback switch with the coupler in secondary signal output channel.
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