CN101686069A - Device and method for calibrating predistortion in time division mobile communication system - Google Patents
Device and method for calibrating predistortion in time division mobile communication system Download PDFInfo
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Abstract
The invention discloses a device and a method for calibrating predistortion in a time division mobile communication system. The device comprises n transmission channels, a signal processing module andn feedback and receiving multiplexer channels, wherein, the n transmission channels correspond to the n feedback and receiving multiplexer channels one by one; the signal processing module stores predistortion compensating parameters, transmits receiving identifications to each feedback and receiving multiplexer channel in the period of service signal receiving, and in the period of service signal transmitting, transmits feedback identifications to each feedback and receiving multiplexer channel and receives feedback signals from each feedback and receiving multiplexer channel, updates the predistortion calibration parameters according to the feedback signals, carries out compensation on the service signals to be transmitted by utilizing the updated predistortion calibration parameters, and transmits the compensated service signals to each transmitting channel corresponding to each feedback and receiving multiplexer channel; and the feedback and receiving multiplexer channels transmitthe service signals and the feedback signals in time division way. By applying the invention, the circuit scale of a predistortion calibrating device can be reduced.
Description
Technical field
The present invention relates to the transmitting set technical field, relate in particular to predistortion calibrating device and method in a kind of time division mobile communication system.
Background technology
In wireless communication technology field,, usually need in transmitter, use high power amplifier in order to improve the transmitting power of transmitter.High power amplifier has nonlinear characteristic, makes high power amplifier when amplifying linearly modulated signal, can make modulated signals produce serious distortion and intermodulation composition, thereby cause problems such as spectral re-growth and Lin Dao interference.
In third generation wireless communication system, binary phase shift keying (QPSK), the 8 system phase shift keyings higher modulation systems of frequency spectrum utilance such as (8PSK) have been adopted, these modulation systems have not only been modulated the phase place of carrier signal, but also modulated the amplitude of carrier signal, thereby produce the bigger non-permanent envelope modulated signal (peak-to-average force ratio is meant the ratio of peak power and average power) of peak-to-average force ratio.The bigger peak-to-average force ratio of this non-permanent envelope modulated signal is had higher requirement to the linearity of high power amplifier again.Therefore, how solving the caused nonlinear distortion question of non-linearization characteristic of high power amplifier, is existing wireless communications system problem demanding prompt solution.
At present, the method for the caused nonlinear distortion question of non-linearization characteristic of solution high power amplifier mainly comprises:
1, in the transmitter of wireless communication system, adopts the higher high power amplifier of the linearity.
2, the transmitting chain with transmitter carries out back-off, makes high power amplifier be operated in linear zone under the requirement of satisfying peak-to-average force ratio.
3, adopt linearization technique, promptly, make the whole transmitting chain that comprises transmission channel and this nonlinearity correction circuit show the characteristic of input signal being carried out linear amplification by the reverse nonlinearity correction circuit of nonlinear characteristic additional and transmission channel.
In above-mentioned three kinds of methods, the 1st kind of method is high to the linearity requirement of high power amplifier itself, therefore semiconductor device processing technology is had relatively high expectations, and the high power amplifier of manufacturing high linearity is the cost height not only, and technical difficulty is also bigger; Therefore the 2nd kind of method, reduced the operating efficiency of transmitter owing to the power of transmitting chain need be carried out rollback; The 3rd kind of method both do not required the high power amplifier of making high linearity, do not need the power of transmitting chain is carried out rollback yet, therefore, both avoided the bigger semiconductor device processing technology of difficulty, also improved simultaneously the efficient of transmitter, be the wider method of using at present, wherein (Digital Pre-Distortion, DPD) technology is the most effective with digital pre-distortion.
The thought of DPD technology is: by digital correction circuit is set in transmitter, thus non-linear at the numeric field compensating power amplifier.Particularly, the DPD technology depends on signal amplitude and the non linear system opposite with the nonlinear characteristic direction of this high power amplifier by place a distorted signals composition before nonlinear high power amplifier, makes that the system after the cascade becomes a linear system.
Fig. 1 is the theory diagram of DPD, among Fig. 1, before the high power amplifier of transmitter cascade a predistorter, wherein the abscissa of curve in the high power amplifier block diagram and the curve in the predistorter block diagram is the range value of input signal, ordinate is the range value of output signal, as seen, because predistorter is just in time opposite to the non-linear direction that signal amplifies with high power amplifier to the non-linear direction that signal amplifies, therefore, the transmitting chain of being made up of predistorter and high power amplifier shows the characteristic of input signal being carried out linear amplification, its transfer function as shown in Equation 1:
F (| V
m|) G (| V
d|)=K formula 1
Wherein, F (| V
m|) be the characteristic function that predistorter amplifies input signal, G (| V
d|) be the characteristic function that power amplifier amplifies input signal, K is a constant gain.
Fig. 2 is the predistortion calibrating device structure chart of the available technology adopting digital pre-distortion technology nonlinear distortion of calibrating two antennamitters.
As shown in Figure 2, in this predistortion calibrating device, every antenna of transmitter all corresponding riches all the way penetrates passage, one road DPD feedback path and one road receive path.Transmission channel wherein is made up of digital to analog converter (D/A converter), upconverter, filter and power amplifier, the DPD feedback path is made up of attenuator, low-converter, filter, analog to digital converter (A/D converter), and receive path is made up of low noise amplifier, filter, low-converter, intermediate frequency amplifier and A/D converter.Workflow to this predistortion calibrating device is introduced below:
In the time division multiplexing mobile communication system, the transmission channel of this predistortion calibrating device and receive path are by the control time-sharing work of switch, wherein, in transmission channel work, the DPD feedback path is coupled out part signal from the signal of transmitter emission, as the predistortion feedback signal, the DPD feedback path is sent into this predistortion feedback signal in the adaptive algorithm device, the adaptive algorithm device is according to the feature of predistortion feedback signal, adopt adaptive algorithm that this pre-distorted signals is carried out Digital Signal Processing, thereby dynamically adjust pre-distortion parameters, regularly upgrade the pre-distortion parameters in the LUT question blank, thereby realize adaptively service signal to be sent being carried out pre-distortion calibration.Predistorter wherein, question blank LUT and adaptive algorithm device are all realized in the programmable logic device (FPGA) at the scene.
As seen, in present predistortion calibrating device, corresponding each transmission channel all is provided with a feedback path and a receive path, and the circuit scale of predistortion calibrating device is bigger, and cost is also higher.
Summary of the invention
In view of this, the purpose of the embodiment of the invention is to provide predistortion calibrating device and the method in a kind of time division mobile communication system, to reduce the circuit scale of predistortion calibrating device.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
Predistortion calibrating device in a kind of time division mobile communication system, comprise n transmission channel, this device comprises that also signal processing module and n feedback receive multiplex channel, wherein, n is a natural number, and a described n transmission channel is corresponding one by one with described n feedback reception multiplex channel;
Described signal processing module at the service signal reception period, receives multiplex channel to each feedback and sends the reception indication, handles and receives the service signal of feedback multiplexed passage from each; During the service signal emission, receive multiplex channel to each feedback and send the feedback indication, reception receives the feedback signal of multiplex channel from each feedback, upgrade the pre-distortion calibration parameter according to this feedback signal, utilize the pre-distortion calibration parameter of upgrading that service signal to be sent is compensated, the service signal after the compensation is issued each transmission channel that each feedback receives the multiplex channel correspondence;
Described feedback receives multiplex channel, receives described reception indication, will transfer to described signal processing module by the service signal that antenna receives; Receive described feedback indication, the feedback signal that will obtain from the service signal coupling of antenna emission transfers to described signal processing module.
Pre-distortion calibration method in a kind of time division mobile communication system, this method comprises:
Merging receive path and feedback path is that a feedback receives multiplex channel, and corresponding with a transmission channel;
At the service signal reception period, utilize feedback to receive the service signal that the multiplex channel transmission receives by antenna; During the service signal emission, utilize feedback to receive multiplex channel and transmit the feedback signal that is coupled to from the signal of antenna emission, upgrade the pre-distortion calibration parameter according to this feedback signal, utilize the pre-distortion calibration parameter of upgrading that service signal to be sent is compensated, the service signal after the compensation is issued with described feedback received the corresponding transmission channel of multiplex channel.
In the embodiment of the invention, include signal processing module and feedback reception multiplex channel in the predistortion calibrating device, this feedback receives control timesharing transmitting business signal and the feedback signal of multiplex channel according to this signal processing module, make the feedback path that is used for the receive path of transmitting business signal in the prior art and is used to transmit feedback signal unite two into one, thereby reduced the circuit scale of predistortion calibrating device.
Description of drawings
Fig. 1 is the theory diagram of DPD;
Fig. 2 is the predistortion calibrating device structure chart of the available technology adopting digital pre-distortion technology nonlinear distortion of calibrating two antennamitters;
Fig. 3 is the composition embodiment schematic diagram of the predistortion calibrating device in the time division mobile communication system provided by the invention;
Fig. 4 is the composition schematic diagram that feedback receives multiplex channel in the predistortion calibrating device of the present invention, comprises figure A and figure B two width of cloth figure;
Fig. 5 is the composition example structure figure that feedback receives multiplex channel in the predistortion calibrating device in the time division mobile communication system provided by the invention;
Fig. 6 is the structure chart of the radio frames in the TDD-LTE system;
Fig. 7 is the structure chart that contains the predistortion calibrating device of even number transmission channel;
Fig. 8 is the structure chart that contains the predistortion calibrating device of 3 transmission channels;
Fig. 9 is the pre-distortion calibration method flow diagram in time division mobile communication system provided by the invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
Fig. 3 is the composition embodiment schematic diagram of the predistortion calibrating device in the time division mobile communication system provided by the invention, as shown in Figure 3, this device comprises that n transmission channel 302, signal processing module 301 and n feedback receive multiplex channel 303, wherein, n is a natural number, and transmission channel 302 is corresponding one by one with feedback reception multiplex channel 303.
Feedback receives multiplex channel 303, receives described reception indication, will transfer to signal processing module 301 by the service signal that antenna receives; Receive described feedback indication, the feedback signal that will obtain from the service signal coupling of antenna emission transfers to signal processing module 301.
Predistortion calibrating device shown in Figure 3 is arranged in the transmitter of described time division mobile communication system, and the antenna shown in Fig. 3 is the antenna of described transmitter.
In the predistortion calibrating device shown in Figure 3, feedback receives multiplex channel 303 and can be divided into feedback reception shared module, switch control module, feedback special module and receive special module, specifically asks for an interview Fig. 4.
Fig. 4 is the composition schematic diagram that feedback receives multiplex channel in the predistortion calibrating device of the present invention, comprises figure A and figure B two width of cloth figure.
Feedback among Fig. 4 receives multiplex channel 403 and comprises that switch control module 4031, feedback receive shared module 4032, feedback special module 4033 and receive special module 4034, wherein:
Switch control module 4031 receives the reception indication from signal processing module 402, and Control and Feedback receives shared module 4032 and links to each other with reception special module 4034; Reception is from the feedback indication of signal processing module 402, and Control and Feedback receives shared module 4032 and links to each other with feedback special module 4033.
Feedback reception shared module 4032, when linking to each other with feedback special module 4033, the feedback signal that the service signal coupling that transmission is launched from antenna obtains, when linking to each other with reception special module 4034, the service signal that transmission receives by antenna.
Feedback special module 4033 is used to transmit described feedback signal.
Receive special module 4034, be used to transmit the described service signal that receives by antenna.
Switch control module 4031, feedback shown in figure A among Fig. 4 and the figure B receives shared module 4032, feedback special module 4033 and receive special module 4034 particular location each other only is feedback to be received multiplex channel be divided into the object lesson that feedback receives shared module, feedback special module and receives special module, is not to be used to limit the present invention.In the practical application, the feedback special module, receive special module and feedback receive the shared module order of connection each other according to the processing sequence of feedback signal, to the processing sequence of the service signal that receives by antenna and the processing apparatus that is used for finishing described processing belong to above-mentioned three kinds of modules which kind of decide.
Particularly, need according to the processing of feedback signal with to the processing of the service signal that receives by antenna, adopt feedback to receive shared module the processing that the two needs jointly and difference is less and realize, the processing that processing that the two is different or difference are bigger is adopted the feedback special module respectively and is received special module and realizes.Feedback receives the connection between shared module, feedback special module and the reception special module and switches and can realize by switch control module.
Described common needs and the less processing of difference are meant handles identical and close to the same treatment performance demands processing of type, in other words, this processing need be adopted the processing apparatus of same type, and exists such processing apparatus can satisfy the demand of the service signal of feedback signal and reception simultaneously.Service signal to feedback signal and reception carries out such processing if desired, then can adopt feedback to receive shared module described processing is carried out in the service signal timesharing of described feedback signal and reception.For example, if feedback signal and service signal all need to carry out A/D conversion ability incoming traffic signal processing module, feedback signal is higher to the rate requirement of A/D converter, and the service signal that receives is higher to the performance demands such as signal to noise ratio of A/D converter, through screening rationally, can select and not only satisfy described rate requirement but also satisfy the A/D converter that performance index such as described signal to noise ratio require, so then can select so not only to satisfy described rate requirement but also satisfy A/D converter that performance index such as described signal to noise ratio require and come timesharing that the service signal of described feedback signal and described reception is carried out described processing.Correspondingly, the A/D converter that is selected belongs to feedback and receives shared module.
Described different processing or the bigger processing of difference are meant the processing of handling the type difference or the same treatment performance demands being differed greatly; in other words; this processing need be adopted dissimilar processing apparatus; perhaps; though the processing apparatus type that this processing is adopted is identical, the service signal of feedback signal and reception runs counter to or differs far away to the requirement of the same performance of the identical processing apparatus of the type.Service signal to feedback signal and reception carries out such processing if desired, then needs to adopt the feedback special module and receive special module respectively the service signal of described feedback signal and described reception to be carried out described processing.For example, if the bandwidth range of the service signal of the bandwidth range of feedback signal and reception is different, and the two differs far away, though all need the two is carried out Filtering Processing, but because the two bandwidth range to filter requires to differ far away, so, need adopt different filters to carry out Filtering Processing respectively to the service signal of described feedback signal and described reception.Correspondingly, the filter that is used for feedback signal is carried out Filtering Processing belongs to the feedback special module, and the filter that the service signal that receives carries out Filtering Processing is belonged to the reception special module.
If when handling to feedback signal with by the service signal that antenna receives, all be to carry out corresponding analog filtering earlier to handle, carry out described A/D conversion again, so, feedback reception shared module is positioned at the feedback special module and receives after the special module; If when handling, all be to carry out the A/D conversion earlier to feedback signal with by the service signal that antenna receives, carry out the corresponding digital Filtering Processing again, so, feedback reception shared module is positioned at the feedback special module and receives before the special module.
To feed back reception multiplex channel 403 is divided into feedback reception shared module 4032, switch control module 4031, feedback special module 4033 and receives special module 4034, can be according to the control of switch control module 4032, utilize feedback to receive shared module 4032 timesharing transmitting business signal and feedback signals, thereby reduce the circuit scale of predistortion calibrating device.
In addition, owing to be provided with feedback special module 4033 and receive special module 4034, therefore, when the processing that described feedback signal and described service signal are carried out differs greatly, can and receive special module 4034 by feedback special module 4033 and realize respectively.
The working range that it should be noted that the device that feedback reception shared module 4032 is adopted need satisfy described by the service signal of antenna reception and the requirement of described feedback signal simultaneously.
Fig. 5 is the composition example structure figure that feedback receives multiplex channel in the predistortion calibrating device in the time division mobile communication system provided by the invention.
Feedback among Fig. 5 receives multiplex channel 403 and comprises that the first switch control module 4031-1, second switch control module 4031-2, the 3rd switch control module 4031-3, the first feedback reception shared module 4032-1, second feedback receive shared module 4032-2, the first feedback special module 4033-1, the second feedback special module 4033-2, the first reception special module 4034-1 and second receive special module 4034-2.Wherein, the first switch control module 4031-1, the first feedback special module 4033-1, first receive special module 4034-1 and the first feedback reception shared module 4032-1 formation first order feedback receives multiplex channel, is used for the signal that this first order feedback reception multiplex channel transmits is carried out radio frequency processing and intermediate frequency processing and amplifying; Second switch control module 4031-2, the second feedback special module 4033-2, second receive special module 4034-2, the 3rd switch control module 4031-3 and the second feedback reception shared module 4032-2 formation second level feedback receives multiplex channel, is used for that the signal that this second level feedback reception multiplex channel transmits is carried out intermediate frequency filtering and handles and modulus (AD) conversion process.
The first switch control module 4031-1 adopts in the prior art and realizes at the switch of antenna place control receiving and transmitting signal, be used for control signal according to signal processing module 401, control antenna, the first feedback special module 4033-1 receive shared module 4032-1 with first feedback and link to each other in turn, and control antenna, the first reception special module 4034-1 and first feedback receive shared module 4032-1 and link to each other in turn.
The first feedback reception shared module 4032-1 and the first feedback special module 4033-1 and first receive special module 4034-1 and link to each other, and link to each other with the second feedback special module 4033-2 or with the second reception special module 4034-2 by second switch control module 4031-2.
Second switch control module 4031-2, receiving shared module 4032-1 with first feedback links to each other, be used for receiving between the special module 4034-2 at the second feedback special module 4033-2 and second according to the control signal of signal processing module 401 and switch, the control second feedback special module 4033-2 and first feedback receive shared module 4032-1 and link to each other or control second and receive special module 4034-2 and the first feedback reception shared module 4032-1 links to each other.
The 3rd switch control module 4031-3, receiving shared module 4032-2 with second feedback links to each other, be used for receiving between the special module 4034-2 at the second feedback special module 4033-2 and second according to the control signal of signal processing module 401 and switch, the control second feedback special module 4033-2 and second feedback receive shared module 4032-2 and link to each other or control second and receive special module 4034-2 and the second feedback reception shared module 4032-2 links to each other.
The first feedback special module 4033-1 and the second feedback special module 4033-2 all are used to transmit feedback signal.
First receives special module 4034-1 and second receives special module 4034-2, all is used to transmit the service signal of described reception.
Which kind of processing apparatus is each module among Fig. 5 specifically comprise according to deciding the introduction of giving an example below to the processing of feedback signal with to the processing of the service signal that receives.
Because the power of the feedback signal that the direct coupling of signal of launching from antenna obtains is bigger, and the power of the service signal that receives from antenna is less and noise is bigger, therefore, for described feedback signal, need earlier it to be carried out power attenuation, for described service signal, need to amplify through low noise amplifier earlier, remove noise through filter again.
Therefore, the first feedback special module 4033-1 comprises attenuator, and first receives special module 4034-1 comprises the low noise amplifier and first receiving filter, and first feedback receives shared module 4031-1 and comprises mixer.
Described attenuator directly links to each other with described mixer, is used for described feedback signal is carried out sending into described mixer after the power attenuation.
Described first receiving filter is connected between described low noise amplifier and the described mixer, is used for the service signal that receives is carried out rf filtering.
Service signal to feedback signal and reception also needs to carry out down-conversion and intermediate frequency amplification, and therefore, first feedback receives shared module 4032-1 also should comprise low-converter and intermediate frequency amplifier.
After the service signal of feedback signal and reception carries out the intermediate frequency amplification, also need to carry out corresponding intermediate frequency filtering, because the two requirement such as bandwidth range to filter differs far away, therefore, the two described filtering of carrying out is needed to adopt the feedback special module respectively and receives special module to carry out.Particularly, the second feedback special module 4033-2 comprises feedback filter, and second receives special module 4034-2 comprises second receiving filter.
Described feedback filter links to each other with described intermediate frequency amplifier respectively by second switch control module 4031-2 with described first receiving filter.
Described feedback filter is used for leaching described feedback signal from the signal of described intermediate frequency amplifier output.Therefore, performance index such as the bandwidth of described feedback filter are decided according to described feedback signal.
Described second receiving filter is used for leaching described service signal from the signal of described intermediate frequency amplifier output.Therefore, performance index such as the bandwidth of described second receiving filter are decided according to described service signal.
The service signal of feedback signal and reception is through behind the baseband filtering, need carry out after the A/D conversion input signal processing module 401 again, and therefore, second feedback receives shared module 4032-2 and comprises A/D converter.
For the predistortion calibrating device among Fig. 3, Fig. 4 and Fig. 5, when n is not less than 2, when promptly this predistortion calibrating device is applied in the multiple antenna transmitter, feedback receives multiplex channel 303 can comprise the binary channels device, two passages of this binary channels device are used separately as two feedbacks and receive multiplex channel, that is to say that two passages of this binary channels device are used in two different feedbacks respectively and receive in the multiplex channel, receive the part of multiplex channel respectively as these two different feedbacks.
Usually, described binary channels device comprises double channel A/D transducer, and/or the binary channels intermediate frequency amplifier, and/or the binary channels low-converter.The working range of described binary channels device satisfies described by the service signal of antenna reception and the requirement of described feedback signal simultaneously.
In addition, for the time division multiplexing mobile communication system, owing to do not have at interval between the transmitting-receiving frequency, so feedback receives multiplex channel and the transmission channel corresponding with it can shared local oscillation circuit and/or clock circuit.Can when reducing the predistortion calibrating device circuit scale, reduce local oscillation circuit and Clock Generation Circuit difficulty like this.
In the above-mentioned predistortion calibrating device, signal processing module is to concern to determine that according to the structure of time slot in the time division mobile communication system of using this predistortion calibrating device service signal reception period and service signal are during launching, be example with time division multiplexing Long Term Evolution (TDD-LTE) system below, how illustrate specifically to concern to determine during the professional received signal and during the service signal emission according to structure of time slot.
The structure of time slot of TDD-LTE system comprises four-layer structure altogether, is respectively system-frame, radio frames, subframe and time slot, and the structure of the radio frames in the TDD-LTE system is described below in conjunction with Fig. 6.
Fig. 6 is the structure chart of the radio frames in the TDD-LTE system.
As shown in Figure 6, each radio frames length is 10ms (10ms=307200Ts), can be divided into the field of two 5ms, and each field can be divided into the subframe that 3 special time slots and 4 length are respectively 30720Ts again.Each subframe all comprises position and the clear position (timeslot interval) that sends data.3 special time slots comprise descending pilot frequency (DwPTS) time slot, protection (GP) time slot and ascending pilot frequency (UpPTS) time slot; comprise one in the GP time slot wherein by being up to descending transfer point (DL/UL) or, also can carrying out the conversion of uplink and downlink during the timeslot interval in each conventional time slot by the transfer point (UL/DL) of downstream-to-upstream.
In the TDD-LTE system, all comprise two up-downgoing transfer points in each subframe, the position of one of them up-downgoing transfer point is fixed, and is arranged in described GP time slot, and another up-downgoing transfer point can be arranged on during the timeslot interval of arbitrary conventional time slot flexibly.Time slot before the up-downgoing transfer point of described flexible setting is an ascending time slot, and time slot afterwards is a descending time slot.
Signal processing module concerns according to above-mentioned structure of time slot, come Control and Feedback to receive multiplex channel according to the position at up-downgoing transfer point place, particularly, at UL/DL transfer point place, receive multiplex channel to feedback and send the feedback indication, at DL/UL transfer point place, receive multiplex channel to feedback and send the reception indication.For the multiplex channel of Control and Feedback reception in time transmits feedback signal at descending time slot; at the ascending time slot transmitting business signal; usually also corresponding Timing Advance need be set; on the basis of up-downgoing transfer point position, the period that shifts to an earlier date described Timing Advance size again receives multiplex channel to feedback and sends described reception indication or the indication of described feedback.
Below in conjunction with concrete example predistortion calibrating device is illustrated, particularly, predistortion calibrating device that contains the even number transmission channel and the predistortion calibrating device that contains the odd number transmission channel are illustrated respectively.
Fig. 7 is the structure chart that contains the predistortion calibrating device of even number transmission channel.
As shown in Figure 7, this contains the even number predistortion calibrating device and comprises that signal processing module, a L transmission channel and L feedback receive multiplex channel, is applied in the transmitter with L root antenna, and wherein L is an even number.Described signal processing module is realized by fpga chip, comprises predistorter, question blank LUT and adaptive algorithm device.
Transmission channel among Fig. 7 comprises D/A converter, upconverter, filter and power amplifier.
Feedback among Fig. 7 receives multiplex channel and comprises low noise amplifier 701, first receiving filter 702, attenuator 703, mixer 704, low-converter 705, intermediate frequency amplifier 706, switch 707, feedback filter 708, second receiving filter 709, A/D converter 710.The low noise amplifier 701 wherein and first receiving filter 702 belong to first and receive special module, attenuator 703 belongs to the first feedback special module, mixer 704, low-converter 705 and intermediate frequency amplifier 706 belong to first feedback and receive shared module, feedback filter 708 belongs to the second feedback special module, second receiving filter 709 belongs to second and receives special module, and A/D converter 710 belongs to second feedback and receives shared module.
Among Fig. 7, two passages in employing binary channels low-converter, binary channels intermediate frequency amplifier and the double channel A/D transducer are realized low-converter, intermediate frequency amplifier and the A/D converter of two antennas respectively.And, the upconverter of the transmission channel of these two antenna correspondences and shared local oscillation circuit of described binary channels low-converter and clock circuit.
Be example with the predistortion calibrating device that contains 3 transmission channels below, introduce the predistortion calibrating device that contains the odd number transmission channel.
Fig. 8 is the structure chart that contains the predistortion calibrating device of 3 transmission channels.
As shown in Figure 8, this predistortion calibrating device that contains 3 transmission channels comprises that signal processing module, 3 transmission channels and 3 feedbacks receive multiplex channel, are applied in the transmitter with 3 antennas.
Transmission channel among Fig. 8 is identical with transmission channel among Fig. 7.
The difference that feedback among Fig. 8 receives the feedback reception multiplex channel among multiplex channel and Fig. 7 is: among Fig. 8, the feedback reception multiplex channel that the feedback of the 1st antenna correspondence receives multiplex channel and the 2nd antenna correspondence adopts two passages in binary channels low-converter, binary channels intermediate frequency amplifier and double channel A/D transducer to realize corresponding low-converter, intermediate frequency amplifier and A/D converter respectively.And, the upconverter of the transmission channel of these two antenna correspondences and shared local oscillation circuit of described binary channels low-converter and clock circuit, and the 3rd antenna adopts single pass low-converter 705-1, intermediate frequency amplifier 706-1 and A/D converter 710-1 to receive low-converter, intermediate frequency amplifier and the A/D converter of multiplex channel as the feedback of the 3rd antenna correspondence.
Provide the method embodiment of pre-distortion calibration in the time division mobile communication system below.
In this method embodiment, merging a receive path and feedback path is that a feedback receives multiplex channel, and corresponding with a transmission channel.
Fig. 9 is the pre-distortion calibration method flow diagram in time division mobile communication system provided by the invention, and as shown in Figure 9, this method comprises:
Step 901 judges that current time is during service signal reception period or service signal are launched, if the service signal reception period, execution in step 902, otherwise execution in step 903.
This step is to determine during service signal reception period and the service signal emission according to the structure of time slot in described time division mobile communication system relation.
Step 902 utilizes feedback to receive the service signal that the multiplex channel transmission receives by antenna.
The predistortion calibrating device that the embodiment of the invention provides and the time division mobile communication system of method be can use and TD-SCDMA system and TDD-LTE system comprised.
As seen from the above technical solution, in the embodiment of the invention, include signal processing module and feedback reception multiplex channel in the predistortion calibrating device, this feedback receives control timesharing transmitting business signal and the feedback signal of multiplex channel according to this signal processing module, make the feedback path that is used for the receive path of transmitting business signal in the prior art and is used to transmit feedback signal unite two into one, thereby reduced the circuit scale of predistortion calibrating device.
Because adopting feedback to receive multiplex channel unites two into one receive path of the prior art and feedback path, transmitting-receiving frequency in the time division mobile communication system is not at interval, therefore, intermediate frequency can be arranged on same frequency, just can realize the local oscillator of receive path and feedback path with a frequency source, simplified the local oscillator design, the spuious and interference of having avoided the local oscillator integrated circuit board to produce simultaneously owing to many local oscillators.
When in feedback reception multiplex channel, using the binary channels device, can also further dwindle the integrated circuit board size, simplify the design of local oscillator and clock circuit, improve the consistency and the reliability of integrated circuit board simultaneously.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1, the predistortion calibrating device in a kind of time division mobile communication system, comprise n transmission channel, it is characterized in that, this device comprises that also signal processing module and n feedback receive multiplex channel, wherein, n is a natural number, and a described n transmission channel is corresponding one by one with described n feedback reception multiplex channel;
Described signal processing module stores the pre-distortion compensated parameter, at the service signal reception period, receives multiplex channel to each feedback and sends the reception indication, handles and receives the service signal of feedback multiplexed passage from each; During the service signal emission, receive multiplex channel to each feedback and send the feedback indication, reception receives the feedback signal of multiplex channel from each feedback, upgrade the pre-distortion calibration parameter according to this feedback signal, utilize the pre-distortion calibration parameter of upgrading that service signal to be sent is compensated, the service signal after the compensation is issued each transmission channel that each feedback receives the multiplex channel correspondence;
Described feedback receives multiplex channel, receives described reception indication, will transfer to described signal processing module by the service signal that antenna receives; Receive described feedback indication, the feedback signal that will obtain from the service signal coupling of antenna emission transfers to described signal processing module.
2, device as claimed in claim 1 is characterized in that, described feedback receives multiplex channel and comprises that switch control module, feedback receive shared module, feedback special module and receive special module;
Described switch control module receives described reception indication, and Control and Feedback receives shared module and links to each other with the reception special module; Receive described feedback indication, Control and Feedback receives shared module and links to each other with the feedback special module;
Described feedback receives shared module, when linking to each other with the feedback special module, transmits described feedback signal, when linking to each other with the reception special module, transmits the described service signal that receives by antenna;
Described feedback special module is used to transmit described feedback signal;
Described reception special module is used to transmit the described service signal that receives by antenna.
3, device as claimed in claim 2 is characterized in that, described switch control module comprises first switch control module, second switch control module and the 3rd switch control module;
Described feedback receives shared module and comprises that first feedback receives shared module and second feedback receives shared module;
Described feedback special module comprises the first feedback special module and the second feedback special module;
Described reception special module comprises that first receives the special module and the second reception special module;
Receive special module and first feedback by described first switch control module, the first feedback special module, first and receive shared module and forms first order feedback and receive multiplex channel, be used for that this first order feedback is received the signal that multiplex channel transmits and carry out radio frequency processing and intermediate frequency processing and amplifying;
The first switch control module control antenna, the first feedback special module receive shared module with first feedback and link to each other in turn, and control antenna, the first reception special module and first feedback receive shared module and link to each other in turn;
Receive special module and second feedback by described the 3rd switch control module, the second feedback special module, second and receive shared module and forms second level feedback and receive multiplex channel, be used for the signal that this second level feedback receives the multiplex channel transmission is carried out intermediate frequency filtering processing and modulus AD conversion process;
The second switch control module receives shared module with first feedback and links to each other, and the control second feedback special module and first feedback receive shared module and link to each other or control second and receive special module and first and feed back the reception shared module and link to each other;
The 3rd switch control module receives shared module with second feedback and links to each other, and the control second feedback special module and second feedback receive shared module and link to each other or control second and receive special module and second and feed back the reception shared module and link to each other.
4, device as claimed in claim 3, it is characterized in that, the described first feedback special module comprises attenuator, and described first receives special module comprises the low noise amplifier and first receiving filter, and described first feedback receives shared module and comprises mixer, low-converter and intermediate frequency amplifier;
Described first receiving filter is used for that the service signal that receives is carried out rf filtering to be handled.
5, device as claimed in claim 3 is characterized in that, the described second feedback special module comprises feedback filter, and described second receives special module comprises second receiving filter, and described second feedback receives shared module and comprises modulus a/d transducer.
As the described device of the arbitrary claim of claim 1 to 5, it is characterized in that 6, described feedback receives shared module and adopts the binary channels device;
Two passages of described binary channels device are used separately as two feedbacks and receive multiplex channel.
7, device as claimed in claim 6 is characterized in that, the working range of described binary channels device satisfies described by the service signal of antenna reception and the requirement of described feedback signal simultaneously.
8, device as claimed in claim 6 is characterized in that,
Described feedback receives multiplex channel transmission channel shared local oscillation circuit and/or the clock circuit corresponding with it.
9, device as claimed in claim 5 is characterized in that,
Described signal processing module is during definite service signal reception period of the relation of the structure of time slot in the described time division mobile communication system and service signal emission.
10, the pre-distortion calibration method in a kind of time division mobile communication system is characterized in that, this method comprises:
Merging a receive path and feedback path is that a feedback receives multiplex channel, and corresponding with a transmission channel;
At the service signal reception period, utilize feedback to receive the service signal that the multiplex channel transmission receives by antenna; During the service signal emission, utilize feedback to receive multiplex channel and transmit the feedback signal that is coupled to from the signal of antenna emission, upgrade the pre-distortion calibration parameter according to this feedback signal, utilize the pre-distortion calibration parameter of upgrading that service signal to be sent is compensated, the service signal after the compensation is issued with described feedback received the corresponding transmission channel of multiplex channel.
11, method as claimed in claim 10 is characterized in that,
Be to determine during described service signal reception period and the service signal emission according to the relation of the structure of time slot in the described time division mobile communication system.
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