CN104219020A - Method and system for processing IQ data of radio-frequency remote unit and radio remote unit - Google Patents
Method and system for processing IQ data of radio-frequency remote unit and radio remote unit Download PDFInfo
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- CN104219020A CN104219020A CN201310213736.2A CN201310213736A CN104219020A CN 104219020 A CN104219020 A CN 104219020A CN 201310213736 A CN201310213736 A CN 201310213736A CN 104219020 A CN104219020 A CN 104219020A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/38—Angle modulation by converting amplitude modulation to angle modulation
- H03C3/40—Angle modulation by converting amplitude modulation to angle modulation using two signal paths the outputs of which have a predetermined phase difference and at least one output being amplitude-modulated
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Abstract
The present invention discloses a method for processing IQ data of radio-frequency remote unit (RRU), the method comprising: after receiving IQ data sent by a baseband processing unit (BBU) via a dual carrier, the RRU conducts parallel processing on IQ data on the dual carrier, modulates the processed dual carrier into a radio-frequency signal and outputs the signal to an antenna terminal. The present invention discloses an IQ data processing system and a radio-frequency remote unit at the same time. The technical solution of the present invention enhances the capability of an active antenna for transmitting data and reduces cost.
Description
Technical field
The present invention relates to the communication technology in the communications field, particularly relate to a kind of processing method of I/Q data of Remote Radio Unit, system and Remote Radio Unit.
Background technology
Along with network frequency range, standard get more and more, support multi-frequency multi-mode high-performance base station---active antenna or active antenna system (AAS, Active Antenna System) arise at the historic moment.Active antenna, as a brand-new industry direction, is a kind of new architecture of base station form, as shown in Figure 1, active antenna by the radio-frequency part diversity of base station to inner antenna, adopt multichannel radio frequency and antenna element to coordinate, implementation space beam forming, completes the transmitting-receiving of radiofrequency signal.Active antenna is as new base station architecture form, and baseband signal is similarly sent to active antenna element by baseband processing unit (BBU, Base Band Unit); Be different from BBU+ Remote Radio Unit (RRU, Remote Radio frequency Unit) framework form, transceiver channel is divided into antenna oscillator rank by active antenna, and granularity is more careful.By configuring the difference of AAE active antenna element, control flexibly and multiple-input and multiple-output (MIMO with the wave beam realizing practical communication networking, Multi Input Multi Output) etc. function, realize more flexibly dynamic resource allocation and share, to reach the target of the whole network best performance and lower fullnet networking cost.
At present, transmitting chain design principle figure general in communication system as shown in Figure 2, after RRU receives the I/Q data that BBU issues, first through Digital IF Processing resume module, then through digital to analog converter (DAC, Digital Analog Converter) digital signal is converted to analog signal, then be modulated to radiofrequency signal through I/Q modulator, eventually pass through a series of process operation such as power amplifier, filtering and the radiofrequency signal needed for antenna is sent to antenna end.At present, the model machine major part of the active antenna that equipment vendor provides adopts the antenna frame of 4 × 2, for realizing the flexible control to wave beam; Under this framework, if will realize the support to vertical multi-beam and space division multiple access, need double radio-frequency channel number, but can make high cost like this, and this scheme is abandoned in current most of equipment commercial city.At present, the mode with the two carriers carry I/Q data of frequency is directly used under there is the antenna frame of 4 × 2, but, because in two carrier waves, the frequency of each subcarrier is identical, there will be the problem causing numeric field power too low because even offsetting with two carrier wave weakening frequently.
Therefore, when not increasing radio-frequency channel number, how improving the ability of active antenna transmission data and its bandwidth taken at radio frequency mouth is not increased, is the problem needing solution at present badly.
Summary of the invention
In view of this, main purpose of the present invention is the processing method of the I/Q data providing a kind of Remote Radio Unit, system and Remote Radio Unit, can improve the ability of active antenna transmission data, reduce costs.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of processing method of I/Q data of radio frequency remote unit RRU, described method comprises:
RRU carries out parallel processing to the I/Q data of described pair of carrier wave, is radiofrequency signal, and exports antenna end to by the two carrier modulation after process after receiving the I/Q data of BBU by two carrier wave transmission.
In such scheme, two carrier waves that described BBU transmission I/Q data uses are same two carrier wave frequently.
In such scheme, described with frequently two carrier wave be carrier wave one and carrier wave two time, the described I/Q data to described pair of carrier wave carries out parallel processing, comprising:
Filtering and Digital Up Convert process are carried out respectively to the I/Q data of described carrier wave one, the I/Q data of described carrier wave two;
The I/Q data of described carrier wave one, the I/Q data of described carrier wave two are converted to respectively the I road analog signal of described carrier wave one and Q road analog signal, the I road analog signal of described carrier wave two and Q road analog signal;
The I road analog signal of the I road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road, the Q road analog signal of the Q road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road.
In such scheme, the described I/Q data to described pair of carrier wave carries out parallel processing, comprising:
Respectively filtering is carried out to the described I/Q data with frequently two carrier wave, and by filtered described with two carrier wave frequently respectively Digital Up Convert be the two carrier wave of alien frequencies; The two carrier wave of described alien frequencies is carrier wave three, carrier wave four;
The I road signal of the I road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the Q road signal of the Q road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the I road signal behind Bing Jianghe road and Q road signal are converted to corresponding analog signal;
Described carrier wave three, described carrier wave four are carried out frequency-conversion processing respectively, makes described carrier wave three and described carrier wave four frequency conversion be same carrier wave frequently.
In such scheme, before exporting antenna end to, described method also comprises:
The radiofrequency signal of the described carrier wave three after modulation and described carrier wave four is carried out Frequency mixing processing.
Present invention also offers a kind of radio frequency remote unit RRU, described RRU comprises transceiver module, parallel processing module and modulation module; Wherein,
Described transceiver module, for receiving the I/Q data that BBU is sent by two carrier wave; For radiofrequency signal is sent to antenna end;
Described parallel processing module, for carrying out parallel processing to the I/Q data of described pair of carrier wave;
Described modulation module, for being radiofrequency signal by the two carrier modulation after described parallel processing module process.
In such scheme, the I/Q data that described transceiver module receives is the I/Q data that BBU uses with two carrier wave transmission frequently.
In such scheme, described with frequently two carrier wave be carrier wave one and carrier wave two time, described parallel processing module also for,
Filtering and Digital Up Convert process are carried out respectively to the I/Q data of described carrier wave one, the I/Q data of described carrier wave two; The I/Q data of described carrier wave one, the I/Q data of described carrier wave two are converted to respectively the I road analog signal of described carrier wave one and Q road analog signal, the I road analog signal of described carrier wave two and Q road analog signal; The I road analog signal of the I road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road, the Q road analog signal of the Q road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road.
In such scheme, described parallel processing module also for,
Respectively filtering is carried out to the described I/Q data with frequently two carrier wave, and by filtered described with two carrier wave frequently respectively Digital Up Convert be treated to the two carrier wave of alien frequencies; The two carrier wave of described alien frequencies is carrier wave three, carrier wave four;
The I road signal of the I road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the Q road signal of the Q road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the I road signal behind Bing Jianghe road and Q road signal are converted to corresponding analog signal;
Described carrier wave three, described carrier wave four are carried out frequency-conversion processing respectively, makes described carrier wave three and described carrier wave four frequency conversion be same carrier wave frequently.
In such scheme, described modulation module also for, the described carrier wave three after modulation and the radiofrequency signal of described carrier wave four are carried out Frequency mixing processing.
Present invention also offers a kind of I/Q data treatment system, described system comprises baseband processing unit BBU and radio frequency remote unit RRU, wherein,
Described BBU, for sending I/Q data by two carrier wave to RRU;
Described RRU, after receiving the I/Q data of described BBU by two carrier wave transmission, carries out parallel processing to the I/Q data of described pair of carrier wave, is radiofrequency signal, and exports antenna end to by the two carrier modulation after process.
In such scheme, described RRU is RRU mentioned above.
The processing method of the I/Q data of Remote Radio Unit provided by the present invention, system and Remote Radio Unit, after RRU receives the I/Q data of BBU by two carrier wave transmission, parallel processing is carried out to the I/Q data of described pair of carrier wave, be radiofrequency signal by the two carrier modulation after process, and export antenna end to.So, the invention solves in current communication system the two carrier wave of the same frequency that occurs to weaken and even offset and the problem that causes numeric field power too low; And when not increasing radio-frequency channel number, by increasing the mode of DAC or I/Q modulator, avoiding and weakening with the two carrier wave of frequency the problem even offset, improve the ability of active antenna transmission data, reduce cost.Concrete, the present invention, when not increasing radio-frequency channel number, by increasing the mode of DAC, achieving with the two carrier wave function of frequency, improve downlink capacity, greatly reduce cost; The present invention is not when increasing radio-frequency channel number, by increasing I/Q modulator, using the two carrier wave of alien frequencies to carry I/Q data, can more I/Q data be transmitted, again because two years wave frequency differences, weaken with the two carrier wave of frequency the problem even offset so there will not be, and, be with frequency carrier wave by described pair of carrier wave frequency conversion, and then what make to export from RRU is with frequently two carrier wave, the bandwidth taken at radio frequency mouth can not increase, and improves downlink capacity, greatly reduces cost.Further, technical solution of the present invention is particularly useful for the applied environment of the antenna frames such as 4 × 2 or 4 × 1.In addition, technical solution of the present invention also can be applicable to the space division multiple access environment of two carrier wave.
Accompanying drawing explanation
Fig. 1 is that in prior art, base station develops schematic diagram;
Fig. 2 is transmitting chain design principle schematic diagram in prior art;
Fig. 3 is the realization flow schematic diagram of the processing method of the I/Q data of a kind of Remote Radio Unit of the present invention;
Fig. 4 is the composition structural representation of Remote Radio Unit of the present invention;
Fig. 5 is a kind of link transmissions structural representation realized with the two carrier transmission I/Q data of frequency of the present invention;
Fig. 6 is that a kind of Remote Radio Unit of the present invention is by the realization flow schematic diagram with the two carrier transmission I/Q data method of frequency;
Fig. 7 is a kind of link transmissions structural representation realizing the two carrier transmission I/Q data of alien frequencies of the present invention;
Fig. 8 is the realization flow schematic diagram of a kind of Remote Radio Unit of the present invention by the two carrier transmission I/Q data method of alien frequencies;
Fig. 9 is embodiment of the present invention schematic flow sheet by same two carrier transmission I/Q data frequently under 4 × 1 antenna frames.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
Fig. 3 is the realization flow schematic diagram of the processing method of the I/Q data of a kind of radio frequency remote unit RRU of the present invention, and as shown in Figure 3, the method comprises the following steps:
Step 301:RRU carries out parallel processing to the I/Q data of described pair of carrier wave after receiving the I/Q data of baseband processing unit BBU by two carrier wave transmission;
Here, two carrier waves that described BBU transmission I/Q data uses are same two carrier wave frequently.
Concrete, described with two carrier wave be frequently carrier wave one and carrier wave two time, the described I/Q data to described pair of carrier wave carries out parallel processing, comprising:
Filtering and Digital Up Convert (DUC, Digital Up Converter) process are carried out respectively to the I/Q data of described carrier wave one, the I/Q data of described carrier wave two;
The I/Q data of described carrier wave one, the I/Q data of described carrier wave two are converted to respectively the I road analog signal of described carrier wave one and Q road analog signal, the I road analog signal of described carrier wave two and Q road analog signal;
The I road analog signal of the I road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road, the Q road analog signal of the Q road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road.
Concrete, the described I/Q data to described pair of carrier wave carries out parallel processing, comprising:
Respectively filtering is carried out to the described I/Q data with frequently two carrier wave, and by filtered described with two carrier wave frequently respectively Digital Up Convert be the two carrier wave of alien frequencies; The two carrier wave of described alien frequencies is carrier wave three, carrier wave four carries out filtering respectively to the described I/Q data with two carrier wave frequently, and by filtered described with two carrier wave frequently respectively Digital Up Convert be the two carrier wave of alien frequencies; Suppose that the two carrier wave of described alien frequencies is carrier wave three, carrier wave four;
The I road signal of the I road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the Q road signal of the Q road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the I road signal behind Bing Jianghe road and Q road signal are converted to corresponding analog signal;
Described carrier wave three, described carrier wave four are carried out frequency-conversion processing respectively, makes described carrier wave three and described carrier wave four frequency conversion be same carrier wave frequently.
Step 302: be radiofrequency signal by carrier modulation two after process, and export antenna end to.
Concrete, before exporting antenna end to, described method also comprises:
The radiofrequency signal of the described carrier wave three after modulation and described carrier wave four is carried out Frequency mixing processing.
Fig. 4 is the composition structural representation of Remote Radio Unit of the present invention, and as shown in Figure 4, described Remote Radio Unit comprises transceiver module 41, parallel processing module 42 and modulation module 43; Wherein,
Described transceiver module 41, for receiving the I/Q data that BBU is sent by two carrier wave; For radiofrequency signal is sent to antenna end;
Described parallel processing module 42, for carrying out parallel processing to the I/Q data of described pair of carrier wave;
Described modulation module 43 is radiofrequency signal for the two carrier modulation after being processed by described parallel processing module 41.
Concrete, the I/Q data that described transceiver module 41 receives is that BBU uses the I/Q data sent with the two carrier wave of frequency.
Concrete, described with two carrier wave be frequently carrier wave one and carrier wave two time, described parallel processing module 42 also for,
Filtering and Digital Up Convert process are carried out respectively to the I/Q data of described carrier wave one, the I/Q data of described carrier wave two; The I/Q data of described carrier wave one, the I/Q data of described carrier wave two are converted to respectively the I road analog signal of described carrier wave one and Q road analog signal, the I road analog signal of described carrier wave two and Q road analog signal; The I road analog signal of the I road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road, the Q road analog signal of the Q road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road.
Concrete, described parallel processing module 42 also for,
Respectively filtering is carried out to the described I/Q data with frequently two carrier wave, and by filtered described with two carrier wave frequently respectively Digital Up Convert be treated to the two carrier wave of alien frequencies; Suppose that the two carrier wave of described alien frequencies is carrier wave three, carrier wave four;
The I road signal of the I road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the Q road signal of the Q road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the I road signal behind Bing Jianghe road and Q road signal are converted to corresponding analog signal;
Described carrier wave three, described carrier wave four are carried out frequency-conversion processing respectively, makes described carrier wave three and described carrier wave four frequency conversion be same carrier wave frequently.
Concrete, described modulation module 43 also for,
The radiofrequency signal of the described carrier wave three after modulation and described carrier wave four is carried out Frequency mixing processing.
Here, described Remote Radio Unit also can be realized by multiple processing apparatus, such as, and the hereinafter described Remote Radio Unit shown in Fig. 5 or Fig. 7.
Fig. 5 is a kind of link transmissions structural representation realized with the two carrier transmission I/Q data of frequency of the present invention, and as shown in Figure 5, this link transmissions structure comprises: BBU and RRU; Wherein, described RRU comprises: Digital IF Processing module, the first digital to analog converter, the second digital to analog converter, the first mixer, the second mixer, I/Q modulator and power amplifier filtration module; Wherein, described data intermediate frequency module and the first digital to analog converter and the second digital to analog converter parallel join, one output of described first digital to analog converter is connected with an input of the first mixer, and another output of described first digital to analog converter is connected with an input of the second mixer; One output of described second digital to analog converter is connected with another input of the first mixer, and another output of described second digital to analog converter is connected with another input of the second mixer; The output of described first mixer, the output of described second mixer are connected with the input of I/Q modulator respectively; The output of described I/Q modulator is connected with the input of power amplifier filtration module, and the output of described power amplifier filtration module is connected with antenna end.
Concrete, described Digital IF Processing module, for receive the I/Q data of BBU by two carrier wave transmission as RRU after, carries out parallel processing to the I/Q data of described pair of carrier wave;
Described pair of carrier wave be carrier wave one with carrier wave two time;
Described first digital to analog converter, for being converted to I road analog signal and the Q road analog signal of described carrier wave one by the I/Q data of described carrier wave one;
Described second digital to analog converter, for being converted to I road analog signal and the Q road analog signal of described carrier wave one by the I/Q data of described carrier wave two.
Here, described pair of carrier wave is that described carrier wave one is identical with the frequency of described carrier wave two with the two carrier wave of frequency.
In order to describe the operation principle of the RRU shown in Fig. 5 in detail, by Remote Radio Unit as shown in Figure 6 by illustrating with the realization flow schematic diagram of the two carrier transmission I/Q data method of frequency.
Fig. 6 is the realization flow schematic diagram of a kind of Remote Radio Unit of the present invention by same two carrier transmission I/Q data method frequently, and as shown in Figure 6, the method comprises the following steps:
After step 601:RRU receives the I/Q data of BBU by two carrier wave transmission, the Digital IF Processing modular concurrent of RRU carries out the process such as filtering, Digital Up Convert to carrier wave one and carrier wave two;
Here, described carrier wave one is identical with the frequency of described carrier wave two, and namely described carrier wave one and described carrier wave two are with frequently.Because Digital IF Processing module is to described carrier wave one and described carrier wave two parallel processing, namely described carrier wave one and described carrier wave two are processed simultaneously, and described carrier wave one and described carrier wave two compartment are come, therefore, there is not the situation of cancelling out each other in described carrier wave one and described carrier wave two.
Here, described Digital IF Processing module is to described carrier wave one and described carrier wave two parallel processing, and the function of each processing unit of described Digital IF Processing module realizes by the program run on processor, also realizes by concrete logical circuit.Do not repeat them here.
Step 602: through the process of Digital IF Processing module, the I/Q data of carrier wave one and the I/Q data of carrier wave two are converted into analog signal respectively through respective digital to analog converter;
Concrete, the I circuit-switched data of carrier wave one is converted to I road analog signal by the first digital to analog converter (DACl), and the Q circuit-switched data of carrier wave one is converted to Q road analog signal; The I circuit-switched data of carrier wave two is converted to I road analog signal by the second digital to analog converter (DAC2), and the Q circuit-switched data of carrier wave two is converted to Q road analog signal.
Here, the I circuit-switched data of carrier wave one or carrier wave two is converted to I road analog signal by the first digital to analog converter or the second digital to analog converter, by same as the prior art for the method that the Q circuit-switched data of carrier wave one or carrier wave two is converted to Q road analog signal, does not repeat them here.
Step 603: the I circuit-switched data of carrier wave one and the I circuit-switched data of carrier wave two are merged into a road by the first mixer, and the I circuit-switched data after merging is sent to I/Q modulator; The Q circuit-switched data of carrier wave one and the Q circuit-switched data of carrier wave two are merged into a road by the second mixer, and the Q circuit-switched data after merging is sent to I/Q modulator;
Here, described mixer all can be two and enters a mixer out, carrier wave one and the I circuit-switched data of carrier wave two or the Q circuit-switched data of carrier wave one and carrier wave two can be merged into a road, but the I circuit-switched data between each carrier wave or Q circuit-switched data can not be obscured, be only merge.
Here, although the data that carrier wave one and carrier wave two transmit are twices of single carrier, because carrier wave one and carrier wave two are identical in the frequency of simulation part, so the bandwidth taken at radio frequency mouth does not increase.
I circuit-switched data after mixer merges by step 604:IQ modulator and Q circuit-switched data are modulated to radiofrequency signal;
Here, the modulator approach of described I/Q modulator is same as the prior art, does not repeat them here.
Step 605: by the radiofrequency signal of modulating through I/Q modulator, carries out the process such as filtering, amplification, and the radiofrequency signal after process is sent to antenna end.
Here, described filtering process can be realized by filter circuit, and described amplification process can be realized by power amplifier.
Here, described I/Q modulator and described power amplifier filtration module can by the radiofrequency signals needed for rf-signal modulation to antenna.
Therefore, Fig. 5 and Fig. 2 compares, although add a digital to analog converter, but can avoid weakening with the two carrier wave of frequency the problem even offset by said method, achieve same two carrier wave frequently and, to the transmission of I/Q data, improve the ability of the transmission data of active antenna, and because two years wave frequencies are identical, from RRU output is that the bandwidth taken at radio frequency mouth does not increase, and greatly reduces cost with the two carrier wave of frequency.
Fig. 7 is a kind of link transmissions structural representation realizing the two carrier transmission I/Q data of alien frequencies of the present invention, as shown in Figure 7, this downlink transmission structure comprises: BBU and RRU, wherein, described RRU comprises: Digital IF Processing module, the first mixer, the second mixer, digital to analog converter, the first splitter, the second splitter, the first I/Q modulator, the second I/Q modulator, the 3rd mixer, frequency mixer and power amplifier filtration module; Wherein, described data intermediate frequency module and the first mixer, the second mixer parallel join, the output of described first mixer is connected with an input of described digital to analog converter, and an output of described digital to analog converter is connected with an input of the first I/Q modulator, an input of the second I/Q modulator respectively by the first splitter; The output of described second mixer is connected with another input of described digital to analog converter, and another output of described digital to analog converter is connected with another input of the first I/Q modulator, another input of the second I/Q modulator respectively by the second splitter; The output of described first I/Q modulator, the output of described second I/Q modulator are connected with the input of frequency mixer by the 3rd mixer, the output of described frequency mixer is connected with the input of power amplifier filtration module, and the output of described power amplifier filtration module is connected with antenna end.
Concrete, described Digital IF Processing module, for receiving BBU as RRU by after the I/Q data with two carrier wave transmission frequently, parallel processing is carried out to the described I/Q data with frequently two carrier wave: respectively filtering is carried out to the described I/Q data with two carrier wave frequently, and by filtered described with two carrier wave frequently respectively Digital Up Convert be treated to the two carrier wave of alien frequencies;
Here, if described pair of carrier wave is carrier wave three and carrier wave four.
Concrete, described first mixer, for closing Lu Weiyi road by the I road signal of the I road signal of described carrier wave three and described carrier wave four;
Concrete, described second mixer, for closing Lu Weiyi road by the Q road signal of the Q road signal of described carrier wave three and described carrier wave four;
Concrete, described digital to analog converter, for being converted to corresponding analog signal by the I road signal behind conjunction road and Q road signal;
Concrete, described first I/Q modulator, for the I road analog signal of described carrier wave three that exported by digital to analog converter and Q road analog signal, carries out frequency-conversion processing, and makes described carrier wave three and the carrier wave after described 4th I/Q modulator frequency conversion four for frequency carrier wave;
Concrete, described second I/Q modulator, carries out frequency-conversion processing for the I road analog signal of described carrier wave four that exported by digital to analog converter and Q road analog signal, and makes described carrier wave four and the carrier wave after described 3rd I/Q modulator frequency conversion three for frequency carrier wave.
Concrete, described first I/Q modulator, also for the I road analog signal of described carrier wave three and Q road analog signal are modulated to radiofrequency signal;
Concrete, described second I/Q modulator, also for the I road analog signal of described carrier wave four and Q road analog signal are modulated to radiofrequency signal;
Described frequency mixer, for carrying out mixing by the radiofrequency signal of the described carrier wave three after modulation and described carrier wave four by frequency mixer.
In order to describe the operation principle of Fig. 7 in detail, illustrate by the realization flow schematic diagram of Remote Radio Unit as shown in Figure 8 by the two carrier transmission I/Q data method of alien frequencies.
Fig. 8 is the realization flow schematic diagram of a kind of Remote Radio Unit of the present invention by the two carrier transmission I/Q data method of alien frequencies, and as shown in Figure 8, the method comprises the following steps:
After step 801:RRU receives the I/Q data of BBU by two carrier wave transmission, the Digital IF Processing modular concurrent of RRU carries out the process such as filtering, Digital Up Convert to carrier wave three and carrier wave four;
Concrete, Digital IF Processing module can by carrier wave three Digital Up Convert to f1, by carrier wave four Digital Up Convert to f2.
Here, after Digital Up Convert process, the frequency f 1 of described carrier wave three is greater than the frequency f 2 of carrier wave four, and because of described carrier wave three different from the frequency of described carrier wave four, so the frequency spectrum of the two does not have overlap, there is not the situation of cancelling out each other.
Step 802: the I circuit-switched data of carrier wave three and the I circuit-switched data of carrier wave four are combined into a road, the Q circuit-switched data of carrier wave three and the Q circuit-switched data of carrier wave four are combined into a road, and the I/Q data after Bing Jianghe road is converted into analog signal by digital to analog converter;
Here, because carrier wave three is different with the frequency of carrier wave four, so there is not the problem of frequency cancellation.
Step 803: the I road analog signal of the described carrier wave three that digital to analog converter is exported and Q road analog signal, I road analog signal and the Q road analog signal of described carrier wave four carry out frequency-conversion processing respectively by respective I/Q modulator, make described carrier wave three and described carrier wave four be same carrier wave frequently; Further, by the I road analog signal of described carrier wave three and Q road analog signal, I road analog signal and the Q road analog signal of described carrier wave four are modulated to radiofrequency signal respectively by respective I/Q modulator;
Here, the frequency of described first I/Q modulator and described second I/Q modulator is f=(f1-f2)/2; And described first I/Q modulator carries out down-conversion, described second I/Q modulator carries out up-conversion.
Concrete, the frequency f 1 of carrier wave three is after the first I/Q modulator modulation, and its frequency becomes f1-f=f1-(f1-f2)/2=(f1+f2)/2; Namely the frequency f 1 of carrier wave three is downconverted to (f1+f2)/2 by described first I/Q modulator.The frequency f 2 of carrier wave four is after the modulation of IQ second I/Q modulator, and its frequency becomes f2+f=f1+ (f1-f2)/2=(f1+f2)/2; Namely described second I/Q modulator by frequency f 2 up-conversion of carrier wave four to (f1+f2)/2; Because the carrier wave three after the first I/Q modulator modulation is identical with the frequency of carrier wave four after the second I/Q modulator modulation, so the bandwidth taken at radio frequency mouth can not increase.
Step 804: the radiofrequency signal of the described carrier wave three after modulation and described carrier wave four is carried out mixing by frequency mixer;
Step 805: carry out the process such as filtering, power amplifier to the radiofrequency signal after mixing, is converted to the radiofrequency signal needed for antenna end by described radiofrequency signal, and exports antenna end to.
Fig. 7 and Fig. 2 compares, although merely add an I/Q modulator on device, the two carrier wave of alien frequencies is used to carry I/Q data, can more I/Q data be transmitted, again because two years wave frequency differences, weaken with the two carrier wave of frequency the problem even offset so there will not be; And if before radio frequency mouth, be still two alien frequencies carrier waves, the bandwidth taken at radio frequency mouth can increase, namely the two carrier wave of alien frequencies can take the bandwidth of a times more; So, before frequency mixer, two alien frequencies carrier waves are converted to the identical carrier wave of two frequencies, and are converted to frequency carrier wave the frequency meeting radiofrequency signal by lower for described frequency two by frequency mixer, then be sent to antenna end through the process of amplification, filtering.Because from RRU output is with the two carrier wave of frequency, thus can not increase in the bandwidth that radio frequency mouth takies.
Fig. 9 is embodiment of the present invention schematic flow sheet by same two carrier transmission I/Q data frequently under 4 × 1 antenna frames, and as shown in Figure 9, this flow process comprises the following steps:
After step 901:RRU receives the carrier wave one of BBU and the I/Q data of carrier wave two, the I/Q data of carrier wave one and carrier wave two is all copied as four tunnels by the Digital IF Processing module of RRU, and carries out the adjustment of phase place and amplitude respectively to four tunnel I/Q data of carrier wave one and carrier wave two;
The Digital IF Processing module of step 902:RRU carries out parallel processing to the first via I/Q data of carrier wave one and the first via I/Q data of carrier wave two;
Here, described carrier wave one is identical with the frequency of carrier wave two, therefore, the each road I/Q data of Digital IF Processing module to each road I/Q data of carrier wave one and carrier wave two of RRU carries out parallel processing, namely described carrier wave one and described carrier wave two are processed simultaneously, and described carrier wave one and described carrier wave two compartment are come, so, there is not the situation of cancelling out each other in described carrier wave one and described carrier wave two.
Step 903: through the process of Digital IF Processing module, the first via I/Q data of carrier wave one and the first via I/Q data of carrier wave two are converted into analog signal respectively through respective digital to analog converter;
Here, the I circuit-switched data of the first via I/Q data of carrier wave one is converted to I road analog signal by the digital to analog converter corresponding with carrier wave one, and the Q circuit-switched data of the first via I/Q data of carrier wave one is converted to Q road analog signal; The I circuit-switched data of the first via I/Q data of carrier wave two is converted to I road analog signal by the digital to analog converter corresponding with carrier wave two, and the Q circuit-switched data of the first via I/Q data of carrier wave two is converted to Q road analog signal.
Step 904: the I circuit-switched data of the first via I/Q data of the I circuit-switched data in the first via I/Q data of carrier wave one and carrier wave two is merged into a road by mixer; The Q circuit-switched data of the Q circuit-switched data of the first via IQ of carrier wave one and the first via I/Q data of carrier wave two is merged into a road by mixer;
Step 905: I and the Q data after the first via I/Q data of the first via IQ of carrier wave one and carrier wave two being merged are modulated to radiofrequency signal through I/Q modulator;
After step 906:IQ modulators modulate to radiofrequency signal, the filtering power amplifier processing module of RRU carries out the process such as filtering, amplification to described radiofrequency signal, described radiofrequency signal is converted to the radiofrequency signal needed for antenna end, and is sent to antenna end.
Described carrier wave one second and third, four tunnel I/Q data and described carrier wave two second and third, four tunnel I/Q data, all through the process of step 901 to 906, thus realize with two carrier wave frequently the transmission of I/Q data.
The present invention also describes a kind of I/Q data treatment system, and described system comprises baseband processing unit BBU and radio frequency remote unit RRU, wherein,
Described BBU, for sending I/Q data by two carrier wave to RRU;
Described RRU, after receiving I/Q data that described BBU sent by two carrier wave, carries out parallel processing to the I/Q data of described pair of carrier wave, and when described pair of carrier wave is the two carrier wave of alien frequencies, be same frequency carrier wave by described pair of carrier wave frequency conversion; To be radiofrequency signal with two carrier modulation frequently, and export antenna end to.
Concrete, the RRU that described RRU is mentioned above.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention, and all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. a processing method for the I/Q data of radio frequency remote unit RRU, is characterized in that, described method comprises:
RRU carries out parallel processing to the I/Q data of described pair of carrier wave, is radiofrequency signal, and exports antenna end to by the two carrier modulation after process after receiving the I/Q data of baseband processing unit BBU by two carrier wave transmission.
2. method according to claim 1, is characterized in that, two carrier waves that described BBU transmission I/Q data uses are same two carrier wave frequently.
3. method according to claim 2, is characterized in that, described with frequently two carrier wave be carrier wave one and carrier wave two time, the described I/Q data to described pair of carrier wave carries out parallel processing, comprising:
Filtering and Digital Up Convert process are carried out respectively to the I/Q data of described carrier wave one, the I/Q data of described carrier wave two;
The I/Q data of described carrier wave one, the I/Q data of described carrier wave two are converted to respectively the I road analog signal of described carrier wave one and Q road analog signal, the I road analog signal of described carrier wave two and Q road analog signal;
The I road analog signal of the I road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road, the Q road analog signal of the Q road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road.
4. method according to claim 2, is characterized in that, the described I/Q data to described pair of carrier wave carries out parallel processing, comprising:
Respectively filtering is carried out to the described I/Q data with frequently two carrier wave, and by filtered described with two carrier wave frequently respectively Digital Up Convert be the two carrier wave of alien frequencies; The two carrier wave of described alien frequencies is carrier wave three, carrier wave four;
The I road signal of the I road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the Q road signal of the Q road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the I road signal behind Bing Jianghe road and Q road signal are converted to corresponding analog signal;
Described carrier wave three, described carrier wave four are carried out frequency-conversion processing respectively, makes described carrier wave three and described carrier wave four frequency conversion be same carrier wave frequently.
5. method according to claim 4, is characterized in that, before exporting antenna end to, described method also comprises:
The radiofrequency signal of the described carrier wave three after modulation and described carrier wave four is carried out Frequency mixing processing.
6. a radio frequency remote unit RRU, is characterized in that, described RRU comprises transceiver module, parallel processing module and modulation module; Wherein,
Described transceiver module, for receiving the I/Q data that BBU is sent by two carrier wave; For radiofrequency signal is sent to antenna end;
Described parallel processing module, for carrying out parallel processing to the I/Q data of described pair of carrier wave;
Described modulation module, for being radiofrequency signal by the two carrier modulation after described parallel processing module process.
7. Remote Radio Unit according to claim 6, is characterized in that, the I/Q data that described transceiver module receives is the I/Q data that BBU uses with two carrier wave transmission frequently.
8. Remote Radio Unit according to claim 7, is characterized in that, described with frequently two carrier wave be carrier wave one and carrier wave two time, described parallel processing module also for,
Filtering and Digital Up Convert process are carried out respectively to the I/Q data of described carrier wave one, the I/Q data of described carrier wave two; The I/Q data of described carrier wave one, the I/Q data of described carrier wave two are converted to respectively the I road analog signal of described carrier wave one and Q road analog signal, the I road analog signal of described carrier wave two and Q road analog signal; The I road analog signal of the I road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road, the Q road analog signal of the Q road analog signal of described carrier wave one and described carrier wave two is closed Lu Weiyi road.
9. Remote Radio Unit according to claim 7, is characterized in that, described parallel processing module also for,
Respectively filtering is carried out to the described I/Q data with frequently two carrier wave, and by filtered described with two carrier wave frequently respectively Digital Up Convert be treated to the two carrier wave of alien frequencies; The two carrier wave of described alien frequencies is carrier wave three, carrier wave four;
The I road signal of the I road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the Q road signal of the Q road signal of described carrier wave three and described carrier wave four is closed Lu Weiyi road, the I road signal behind Bing Jianghe road and Q road signal are converted to corresponding analog signal;
Described carrier wave three, described carrier wave four are carried out frequency-conversion processing respectively, makes described carrier wave three and described carrier wave four frequency conversion be same carrier wave frequently.
10. Remote Radio Unit according to claim 9, is characterized in that, described modulation module also for,
The radiofrequency signal of the described carrier wave three after modulation and described carrier wave four is carried out Frequency mixing processing.
11. 1 kinds of I/Q data treatment systems, is characterized in that, described system comprises baseband processing unit BBU and radio frequency remote unit RRU, wherein,
Described BBU, for sending I/Q data by two carrier wave to RRU;
Described RRU, after receiving the I/Q data of described BBU by two carrier wave transmission, carries out parallel processing to the I/Q data of described pair of carrier wave, is radiofrequency signal, and exports antenna end to by the two carrier modulation after process.
12. systems according to claim 11, is characterized in that, described RRU is the RRU described in any one of power 6 to power 10.
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| CN201310213736.2A CN104219020B (en) | 2013-05-31 | 2013-05-31 | Processing method, system and the Remote Radio Unit of the I/Q data of Remote Radio Unit |
| PCT/CN2013/090964 WO2014190750A1 (en) | 2013-05-31 | 2013-12-30 | Remote radio frequency unit, iq data processing method, system, and computer storage medium |
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| CN201310213736.2A CN104219020B (en) | 2013-05-31 | 2013-05-31 | Processing method, system and the Remote Radio Unit of the I/Q data of Remote Radio Unit |
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