CN104219020B - IQ data processing method and system of remote radio unit and remote radio unit - Google Patents
IQ data processing method and system of remote radio unit and remote radio unit Download PDFInfo
- Publication number
- CN104219020B CN104219020B CN201310213736.2A CN201310213736A CN104219020B CN 104219020 B CN104219020 B CN 104219020B CN 201310213736 A CN201310213736 A CN 201310213736A CN 104219020 B CN104219020 B CN 104219020B
- Authority
- CN
- China
- Prior art keywords
- carrier
- frequency
- data
- signal
- same
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C2200/00—Indexing scheme relating to details of modulators or modulation methods covered by H03C
- H03C2200/0037—Functional aspects of modulators
- H03C2200/0058—Quadrature arrangements
Landscapes
- Transmitters (AREA)
- Transceivers (AREA)
Abstract
本发明公开了一种射频拉远单元(RRU)的IQ数据的处理方法，包括：RRU接收到基带处理单元(BBU)通过双载波发送的IQ数据后，对所述双载波的IQ数据进行并行处理，将处理后的双载波调制为射频信号，并输出至天线端。本发明还同时公开了一种IQ数据处理系统及射频拉远单元。采用本发明的技术方案，提高了有源天线传输数据的能力，降低了成本。
The invention discloses a method for processing IQ data of a remote radio unit (RRU), which includes: after the RRU receives the IQ data sent by a baseband processing unit (BBU) through dual carriers, parallel processing is performed on the IQ data of the dual carriers processing, modulating the processed dual-carrier into a radio frequency signal, and outputting it to the antenna end. The invention also discloses an IQ data processing system and a remote radio unit at the same time. By adopting the technical scheme of the invention, the ability of the active antenna to transmit data is improved, and the cost is reduced.
Description
Technical Field
The present invention relates to communications technologies in the communications field, and in particular, to a method and a system for processing IQ data of a radio remote unit, and a radio remote unit.
Background
With the increasing number of network frequency bands and systems, a high performance base station supporting multiple frequencies and multiple modes, i.e., an Active Antenna or an Active Antenna System (AAS), has come into force. As shown in fig. 1, the active antenna collects the radio frequency part of the base station into the antenna, and adopts the cooperation of multi-channel radio frequency and antenna array to realize space beam forming and complete the transceiving of radio frequency signals. An active antenna is used as a new Base station architecture form, and a baseband processing Unit (BBU) similarly sends a baseband signal to the active antenna Unit; different from a BBU (base band Unit) and RRU (Remote Radio frequency Unit) architecture form, the active antenna divides a receiving and transmitting channel to an antenna oscillator level, and granularity is finer. Through different configurations of the active antenna elements, functions such as beam flexible control and Multiple Input Multiple Output (MIMO) of actual communication networking are achieved, more flexible dynamic resource configuration and sharing are achieved, and the purposes of optimal overall network performance and low overall network networking cost are achieved.
At present, a general transmit link design schematic diagram in a communication system is shown in fig. 2, after receiving IQ data issued by BBU, an RRU first processes the IQ data through a Digital intermediate frequency processing module, then converts the Digital signal into an analog signal through a Digital-to-analog converter (DAC), modulates the analog signal into a radio frequency signal through an IQ modulator, and finally sends the radio frequency signal required by an antenna to an antenna end through a series of processing operations such as power amplification and filtering. At present, most of prototype machines of active antennas provided by equipment manufacturers adopt a 4 × 2 antenna architecture for realizing flexible control of beams; under the structure, if the support of the vertical multi-beam and the space division multiple access is realized, the number of radio frequency channels is doubled, but the cost is high, and most equipment manufacturers abandon the scheme at present. At present, a mode of directly using the same-frequency dual-carrier to carry IQ data under a 4 × 2 antenna architecture exists, but because the frequency of each subcarrier in two carriers is completely the same, the problem of too low digital domain power caused by weakening or even cancelling the same-frequency dual-carrier occurs.
Therefore, it is an urgent need to solve the problem how to improve the data transmission capability of the active antenna without increasing the number of rf channels and the bandwidth occupied by the active antenna at the rf port.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for processing IQ data of a remote radio unit, and the remote radio unit, which can improve data transmission capability of an active antenna and reduce cost.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a method for processing IQ data of a Radio Remote Unit (RRU), which comprises the following steps:
and after receiving IQ data sent by the BBU through the dual-carrier, the RRU performs parallel processing on the IQ data of the dual-carrier, modulates the processed dual-carrier into a radio frequency signal and outputs the radio frequency signal to an antenna end.
In the above scheme, the dual carriers used by the BBU to send the IQ data are same-frequency dual carriers.
In the above scheme, when the dual carriers of the same frequency are a carrier one and a carrier two, the performing parallel processing on the IQ data of the dual carriers includes:
filtering and carrying out digital up-conversion processing on the IQ data of the first carrier and the IQ data of the second carrier respectively;
converting the IQ data of the first carrier and the IQ data of the second carrier into an I-path analog signal and a Q-path analog signal of the first carrier and an I-path analog signal and a Q-path analog signal of the second carrier respectively;
combining the I-path analog signal of the first carrier and the I-path analog signal of the second carrier into one path, and combining the Q-path analog signal of the first carrier and the Q-path analog signal of the second carrier into one path.
In the foregoing solution, the performing parallel processing on the IQ data of the dual carriers includes:
filtering the IQ data of the same-frequency dual-carrier waves respectively, and digitally up-converting the filtered same-frequency dual-carrier waves into different-frequency dual-carrier waves respectively; the pilot frequency double carrier waves are carrier wave three and carrier wave four;
combining the I-path signal of the third carrier wave and the I-path signal of the fourth carrier wave into one path, combining the Q-path signal of the third carrier wave and the Q-path signal of the fourth carrier wave into one path, and converting the combined I-path signal and Q-path signal into corresponding analog signals;
and respectively carrying out frequency conversion processing on the carrier III and the carrier IV to enable the carrier III and the carrier IV to be frequency-converted into same-frequency carriers.
In the above solution, before outputting to the antenna end, the method further includes:
and mixing the modulated radio frequency signals of the carrier wave three and the carrier wave four.
The invention also provides a radio remote unit RRU, which comprises a transceiver module, a parallel processing module and a modulation module; wherein,
the transceiver module is used for receiving IQ data sent by the BBU through a dual-carrier; the antenna is used for transmitting the radio frequency signal to an antenna end;
the parallel processing module is used for carrying out parallel processing on the IQ data of the double carriers;
and the modulation module is used for modulating the dual-carrier processed by the parallel processing module into a radio frequency signal.
In the above scheme, the IQ data received by the transceiver module is IQ data sent by the BBU using a co-frequency dual carrier.
In the above scheme, when the same-frequency dual carriers are a carrier one and a carrier two, the parallel processing module is further configured to,
filtering and carrying out digital up-conversion processing on the IQ data of the first carrier and the IQ data of the second carrier respectively; converting the IQ data of the first carrier and the IQ data of the second carrier into an I-path analog signal and a Q-path analog signal of the first carrier and an I-path analog signal and a Q-path analog signal of the second carrier respectively; combining the I-path analog signal of the first carrier and the I-path analog signal of the second carrier into one path, and combining the Q-path analog signal of the first carrier and the Q-path analog signal of the second carrier into one path.
In the above solution, the parallel processing module is further configured to,
filtering the IQ data of the same-frequency dual-carrier waves respectively, and carrying out digital up-conversion processing on the filtered same-frequency dual-carrier waves respectively to obtain different-frequency dual-carrier waves; the pilot frequency double carrier waves are carrier wave three and carrier wave four;
combining the I-path signal of the third carrier wave and the I-path signal of the fourth carrier wave into one path, combining the Q-path signal of the third carrier wave and the Q-path signal of the fourth carrier wave into one path, and converting the combined I-path signal and Q-path signal into corresponding analog signals;
and respectively carrying out frequency conversion processing on the carrier III and the carrier IV to enable the carrier III and the carrier IV to be frequency-converted into same-frequency carriers.
In the foregoing scheme, the modulation module is further configured to perform frequency mixing processing on the modulated radio frequency signals of the carrier three and the carrier four.
The invention also provides an IQ data processing system, which comprises a baseband processing unit BBU and a radio remote unit RRU, wherein,
the BBU is used for sending IQ data to the RRU through double carriers;
and the RRU is used for receiving the IQ data sent by the BBU through the dual-carrier, then carrying out parallel processing on the IQ data of the dual-carrier, modulating the processed dual-carrier into a radio frequency signal, and outputting the radio frequency signal to an antenna end.
In the above scheme, the RRU is the RRU described above.
According to the processing method and system for the IQ data of the RRU and the RRU, after the RRU receives the IQ data sent by the BBU through the dual-carrier, the IQ data of the dual-carrier is processed in parallel, the processed dual-carrier is modulated into a radio frequency signal, and the radio frequency signal is output to an antenna end. Therefore, the invention solves the problem that the power of a digital domain is too low due to weakening and even offsetting of the same-frequency double carriers in the current communication system; under the condition of not increasing the number of radio frequency channels, by means of increasing the DAC or the IQ modulator, the problem of weakening and even offsetting of the same-frequency double carriers is avoided, the data transmission capacity of the active antenna is improved, and the cost is reduced. Specifically, under the condition that the number of radio frequency channels is not increased, the invention realizes the function of same frequency double carrier waves by increasing the DAC, improves the downlink capacity and greatly reduces the cost; the invention can transmit more IQ data by increasing the IQ modulator and using different-frequency dual carriers to bear IQ data without increasing the number of radio frequency channels, and because the frequencies of the two carriers are different, the problem of weakening and even offsetting of the same-frequency dual carriers can not occur. Moreover, the technical scheme of the invention is particularly suitable for application environments of antenna architectures such as 4 × 2 or 4 × 1. In addition, the technical scheme of the invention can also be applied to the space division multiple access environment of double carriers.
Drawings
Fig. 1 is a schematic diagram of evolution of a base station in the prior art;
FIG. 2 is a schematic diagram of a design principle of a transmission link in the prior art;
fig. 3 is a schematic flow chart illustrating an implementation of a method for processing IQ data of a remote radio unit according to the present invention;
fig. 4 is a schematic structural diagram of a remote radio unit according to the present invention;
FIG. 5 is a schematic diagram of a link transmission structure for implementing transmission of IQ data by dual carriers of the same frequency according to the present invention;
fig. 6 is a schematic flow chart illustrating an implementation of a method for transmitting IQ data by a radio remote unit through a same-frequency dual carrier according to the present invention;
fig. 7 is a schematic diagram of a link transmission structure for implementing different-frequency dual-carrier transmission of IQ data according to the present invention;
fig. 8 is a schematic flow chart illustrating an implementation of a method for transmitting IQ data by a radio remote unit through different-frequency dual carriers according to the present invention;
fig. 9 is a schematic flow chart illustrating transmission of IQ data by dual co-frequency carriers under a 4 × 1 antenna architecture according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 3 is a schematic diagram of an implementation flow of a method for processing IQ data of a remote radio unit RRU according to the present invention, and as shown in fig. 3, the method includes the following steps:
step 301: after receiving IQ data sent by a baseband processing unit BBU through a dual-carrier, an RRU performs parallel processing on the IQ data of the dual-carrier;
here, the dual carriers used by the BBU to send the IQ data are same-frequency dual carriers.
Specifically, when the dual carriers of the same frequency are a carrier one and a carrier two, the parallel processing of the IQ data of the dual carriers includes:
filtering and Digital Up Converter (DUC) processing are respectively carried out on the IQ data of the first carrier and the IQ data of the second carrier;
converting the IQ data of the first carrier and the IQ data of the second carrier into an I-path analog signal and a Q-path analog signal of the first carrier and an I-path analog signal and a Q-path analog signal of the second carrier respectively;
combining the I-path analog signal of the first carrier and the I-path analog signal of the second carrier into one path, and combining the Q-path analog signal of the first carrier and the Q-path analog signal of the second carrier into one path.
Specifically, the parallel processing of the IQ data of the dual carriers includes:
filtering the IQ data of the same-frequency dual-carrier waves respectively, and digitally up-converting the filtered same-frequency dual-carrier waves into different-frequency dual-carrier waves respectively; the different-frequency dual carrier wave is a carrier wave three, the carrier wave four filters the IQ data of the same-frequency dual carrier wave respectively, and the filtered same-frequency dual carrier waves are digitally up-converted into different-frequency dual carrier waves respectively; the different-frequency double carriers are assumed to be a carrier three and a carrier four;
combining the I-path signal of the third carrier wave and the I-path signal of the fourth carrier wave into one path, combining the Q-path signal of the third carrier wave and the Q-path signal of the fourth carrier wave into one path, and converting the combined I-path signal and Q-path signal into corresponding analog signals;
and respectively carrying out frequency conversion processing on the carrier III and the carrier IV to enable the carrier III and the carrier IV to be frequency-converted into same-frequency carriers.
Step 302: and modulating the processed dual-carrier into a radio frequency signal and outputting the radio frequency signal to an antenna end.
Specifically, before outputting to the antenna end, the method further includes:
and mixing the modulated radio frequency signals of the carrier wave three and the carrier wave four.
Fig. 4 is a schematic diagram of a composition structure of a remote radio unit according to the present invention, as shown in fig. 4, the remote radio unit includes a transceiver module 41, a parallel processing module 42, and a modulation module 43; wherein,
the transceiver module 41 is configured to receive IQ data sent by a dual carrier by the BBU; the antenna is used for transmitting the radio frequency signal to an antenna end;
the parallel processing module 42 is configured to perform parallel processing on the IQ data of the dual carriers;
the modulation module 43 is configured to modulate the dual carrier processed by the parallel processing module 41 into a radio frequency signal.
Specifically, the IQ data received by the transceiver module 41 is IQ data sent by the BBU using a co-frequency dual carrier.
Specifically, when the same-frequency dual carriers are a carrier one and a carrier two, the parallel processing module 42 is further configured to,
filtering and carrying out digital up-conversion processing on the IQ data of the first carrier and the IQ data of the second carrier respectively; converting the IQ data of the first carrier and the IQ data of the second carrier into an I-path analog signal and a Q-path analog signal of the first carrier and an I-path analog signal and a Q-path analog signal of the second carrier respectively; combining the I-path analog signal of the first carrier and the I-path analog signal of the second carrier into one path, and combining the Q-path analog signal of the first carrier and the Q-path analog signal of the second carrier into one path.
In particular, the parallel processing module 42 is also configured to,
filtering the IQ data of the same-frequency dual-carrier waves respectively, and carrying out digital up-conversion processing on the filtered same-frequency dual-carrier waves respectively to obtain different-frequency dual-carrier waves; the different-frequency double carriers are assumed to be a carrier three and a carrier four;
combining the I-path signal of the third carrier wave and the I-path signal of the fourth carrier wave into one path, combining the Q-path signal of the third carrier wave and the Q-path signal of the fourth carrier wave into one path, and converting the combined I-path signal and Q-path signal into corresponding analog signals;
and respectively carrying out frequency conversion processing on the carrier III and the carrier IV to enable the carrier III and the carrier IV to be frequency-converted into same-frequency carriers.
In particular, the modulation module 43 is also configured to,
and mixing the modulated radio frequency signals of the carrier wave three and the carrier wave four.
Here, the remote radio unit may also be implemented by a plurality of processing devices, for example, the remote radio unit shown in fig. 5 or fig. 7 described below.
Fig. 5 is a schematic diagram of a link transmission structure for implementing same-frequency dual-carrier transmission of IQ data according to the present invention, as shown in fig. 5, the link transmission structure includes: BBU and RRU; wherein the RRU comprises: the digital intermediate frequency processing module, the first digital-to-analog converter, the second digital-to-analog converter, the first combiner, the second combiner, the IQ modulator and the power amplifier filtering module; the digital intermediate frequency module is connected with a first digital-to-analog converter and a second digital-to-analog converter in parallel, one output end of the first digital-to-analog converter is connected with one input end of a first combiner, and the other output end of the first digital-to-analog converter is connected with one input end of a second combiner; one output end of the second digital-to-analog converter is connected with the other input end of the first combiner, and the other output end of the second digital-to-analog converter is connected with the other input end of the second combiner; the output end of the first combiner and the output end of the second combiner are respectively connected with the input end of an IQ modulator; the output end of the IQ modulator is connected with the input end of the power amplifier filtering module, and the output end of the power amplifier filtering module is connected with the antenna end.
Specifically, the digital intermediate frequency processing module is configured to perform parallel processing on IQ data of a dual carrier after the RRU receives the IQ data sent by the BBU through the dual carrier;
when the double carriers are a carrier I and a carrier II;
the first digital-to-analog converter is used for converting the IQ data of the first carrier into an I-path analog signal and a Q-path analog signal of the first carrier;
and the second digital-to-analog converter is used for converting the IQ data of the second carrier into an I-path analog signal and a Q-path analog signal of the first carrier.
Here, the dual carriers are same-frequency dual carriers, and the frequency of the first carrier is the same as that of the second carrier.
To illustrate the working principle of the RRU shown in fig. 5 in detail, an implementation flow diagram of a method for transmitting IQ data by a dual co-frequency carrier by a radio remote unit shown in fig. 6 is shown.
Fig. 6 is a schematic flow chart illustrating an implementation process of a method for transmitting IQ data by a remote radio unit through a co-frequency dual carrier according to the present invention, as shown in fig. 6, the method includes the following steps:
step 601: after receiving IQ data sent by a BBU through double carriers, a digital intermediate frequency processing module of the RRU carries out filtering, digital up-conversion and other processing on a carrier I and a carrier II in parallel;
here, the frequencies of the first carrier and the second carrier are the same, that is, the first carrier and the second carrier are the same frequency. The digital intermediate frequency processing module processes the first carrier and the second carrier in parallel, namely processes the first carrier and the second carrier simultaneously and separates the first carrier and the second carrier, so that the first carrier and the second carrier do not cancel each other.
Here, the digital if processing module processes the first carrier and the second carrier in parallel, and the functions of the processing units of the digital if processing module may be implemented by a program running on a processor or by a specific logic circuit. And will not be described in detail herein.
Step 602: the IQ data of the carrier I and the IQ data of the carrier II are respectively converted into analog signals through respective digital-to-analog converters after being processed by the digital intermediate frequency processing module;
specifically, a first digital-to-analog converter (DACl) converts the I path of data of the first carrier into an I path of analog signal, and converts the Q path of data of the first carrier into a Q path of analog signal; a second digital-to-analog converter (DAC2) converts the I data of carrier two into an I analog signal and converts the Q data of carrier two into a Q analog signal.
Here, the method for converting the I-path data of the carrier wave one or the carrier wave two into the I-path analog signal and converting the Q-path data of the carrier wave one or the carrier wave two into the Q-path analog signal by the first digital-to-analog converter or the second digital-to-analog converter is the same as the prior art, and is not described herein again.
Step 603: combining the I path data of the first carrier and the I path data of the second carrier into one path through a first combiner, and sending the combined I path data to an IQ modulator; combining the Q-path data of the first carrier and the Q-path data of the second carrier into one path through a second combiner, and sending the combined Q-path data to an IQ modulator;
here, the combiners may be two-in one-out combiners, and may combine the I-path data of the first carrier and the second carrier or the Q-path data of the first carrier and the second carrier into one path, but the I-path data or the Q-path data between the carriers are not mixed and are merely combined.
Here, although the data transmitted by the first carrier and the second carrier is twice that of the single carrier, since the frequencies of the first carrier and the second carrier in the analog part are the same, the bandwidth occupied at the radio port is not increased.
Step 604: the IQ modulator modulates the I path data and the Q path data combined by the combiner to a radio frequency signal;
here, the modulation method of the IQ modulator is the same as the prior art, and is not described herein again.
Step 605: and carrying out filtering, amplification and other processing on the radio-frequency signal modulated by the IQ modulator, and sending the processed radio-frequency signal to an antenna end.
Here, the filtering process may be implemented by a filtering circuit, and the amplifying process may be implemented by a power amplifier.
Here, the IQ modulator and the power amplifier filter module may modulate the rf signal to the rf signal required by the antenna.
Therefore, although a digital-to-analog converter is added in fig. 5 compared with fig. 2, the method can avoid the problem of weakening or even offsetting the same-frequency dual carrier, realize the transmission of IQ data by the same-frequency dual carrier, improve the data transmission capability of the active antenna, and because the frequencies of the two carriers are the same, the same-frequency dual carrier is output from the RRU, the bandwidth occupied by the radio frequency port is not increased, and the cost is greatly reduced.
Fig. 7 is a schematic diagram of a link transmission structure for implementing IQ data transmission on dual carriers in different frequencies according to the present invention, as shown in fig. 7, the downlink transmission structure includes: BBU and RRU, wherein, the RRU includes: the digital intermediate frequency processing module, the first combiner, the second combiner, the digital-to-analog converter, the first splitter, the second splitter, the first IQ modulator, the second IQ modulator, the third combiner, the mixer and the power amplifier filtering module; the digital intermediate frequency module is connected with the first combiner and the second combiner in parallel, the output end of the first combiner is connected with one input end of the digital-to-analog converter, and one output end of the digital-to-analog converter is respectively connected with one input end of the first IQ modulator and one input end of the second IQ modulator through the first divider; the output end of the second combiner is connected with the other input end of the digital-to-analog converter, and the other output end of the digital-to-analog converter is respectively connected with the other input end of the first IQ modulator and the other input end of the second IQ modulator through the second combiner; the output end of the first IQ modulator and the output end of the second IQ modulator are connected with the input end of a mixer through a third combiner, the output end of the mixer is connected with the input end of a power amplifier filtering module, and the output end of the power amplifier filtering module is connected with an antenna end.
Specifically, the digital intermediate frequency processing module is configured to, after the RRU receives IQ data sent by the BBU through the same-frequency dual carrier, perform parallel processing on the IQ data of the same-frequency dual carrier: filtering the IQ data of the same-frequency dual-carrier waves respectively, and carrying out digital up-conversion processing on the filtered same-frequency dual-carrier waves respectively to obtain different-frequency dual-carrier waves;
here, the dual carriers are assumed to be carrier three and carrier four.
Specifically, the first combiner is configured to combine the I-path signal of the carrier three and the I-path signal of the carrier four into one path;
specifically, the second combiner is configured to combine the Q-path signal of the carrier three and the Q-path signal of the carrier four into one path;
specifically, the digital-to-analog converter is configured to convert the combined I-path signal and Q-path signal into corresponding analog signals;
specifically, the first IQ modulator is configured to perform frequency conversion on the I-path analog signal and the Q-path analog signal of the third carrier output by the digital-to-analog converter, and make the third carrier and the fourth carrier frequency-converted by the fourth IQ modulator be a same-frequency carrier;
specifically, the second IQ modulator is configured to perform frequency conversion on the I-path analog signal and the Q-path analog signal of the carrier four output by the digital-to-analog converter, and make the carrier four and the carrier three subjected to frequency conversion by the third IQ modulator be a same-frequency carrier.
Specifically, the first IQ modulator is further configured to modulate the I-path analog signal and the Q-path analog signal of the carrier three into radio frequency signals;
specifically, the second IQ modulator is further configured to modulate the I-path analog signal and the Q-path analog signal of the carrier four into radio frequency signals;
and the mixer is used for mixing the modulated radio frequency signals of the carrier wave three and the carrier wave four through the mixer.
To explain the working principle of fig. 7 in detail, the implementation flow diagram of the method for transmitting IQ data by an inter-frequency dual carrier by an rf remote unit as shown in fig. 8 can be used for illustration.
Fig. 8 is a schematic flow chart illustrating an implementation process of a method for transmitting IQ data by a radio remote unit through a dual carrier with different frequencies according to the present invention, as shown in fig. 8, the method includes the following steps:
step 801: after receiving IQ data sent by the BBU through the dual carriers, the RRU performs filtering, digital up-conversion and other processing on a carrier III and a carrier IV in parallel by a digital intermediate frequency processing module;
specifically, the digital if processing module may up-convert the carrier three number to f1 and up-convert the carrier four number to f 2.
Here, after the digital up-conversion processing, the frequency f1 of the carrier three is greater than the frequency f2 of the carrier four, and because the frequencies of the carrier three and the carrier four are different, the frequency spectrums of the two do not overlap, and there is no case of mutual cancellation.
Step 802: combining the I-path data of the carrier wave III and the I-path data of the carrier wave IV into one path, combining the Q-path data of the carrier wave III and the Q-path data of the carrier wave IV into one path, and converting the combined IQ data into an analog signal through a digital-to-analog converter;
here, since the frequencies of carrier three and carrier four are different, there is no problem of frequency cancellation.
Step 803: carrying out frequency conversion processing on the I-path analog signal and the Q-path analog signal of the carrier III, which are output by a digital-to-analog converter, and the I-path analog signal and the Q-path analog signal of the carrier IV through respective IQ modulators respectively, so that the carrier III and the carrier IV are same-frequency carriers; modulating the I-path analog signal and the Q-path analog signal of the carrier wave three, and modulating the I-path analog signal and the Q-path analog signal of the carrier wave four into radio frequency signals respectively through respective IQ modulators;
here, the frequencies of the first IQ modulator and the second IQ modulator are both f ═ (f1-f 2)/2; and the first IQ modulator performs down-conversion, and the second IQ modulator performs up-conversion.
Specifically, after the frequency f1 of the carrier three is modulated by the first IQ modulator, the frequency is changed to f1-f 1- (f1-f 2)/2-f 1+ f 2)/2; i.e. the first IQ-modulator down-converts the frequency f1 of carrier three to (f1+ f 2)/2. After the frequency f2 of the carrier four is modulated by the IQ second IQ modulator, the frequency becomes f2+ f ═ f1+ (f1-f2)/2 ═ f1+ f 2)/2; that is, the second IQ modulator up-converts the frequency f2 of carrier four to (f1+ f 2)/2; because the frequency of the carrier wave III modulated by the first IQ modulator is the same as that of the carrier wave IV modulated by the second IQ modulator, the bandwidth occupied by the radio frequency port cannot be increased.
Step 804: mixing the modulated radio frequency signals of the carrier wave three and the carrier wave four through a mixer;
step 805: and carrying out filtering, power amplification and other processing on the radio-frequency signals after frequency mixing, converting the radio-frequency signals into radio-frequency signals required by an antenna end, and outputting the radio-frequency signals to the antenna end.
Compared with fig. 2, although only one IQ modulator is added to the device, the use of dual carriers with different frequencies to carry IQ data can transmit more IQ data, and the problem of attenuation or even cancellation of dual carriers with the same frequency does not occur because the two carriers have different frequencies; moreover, if two different-frequency carriers are still present before the radio frequency port, the bandwidth occupied by the radio frequency port will be increased, i.e. the different-frequency dual carriers will occupy one more time of bandwidth; therefore, before the mixer, the two different-frequency carriers are converted into two carriers with the same frequency, the two same-frequency carriers with lower frequency are converted into frequencies conforming to radio frequency signals through the mixer, and the frequencies are amplified and filtered to be sent to an antenna end. Because the same-frequency dual carriers are output from the RRU, the bandwidth occupied by the radio frequency interface cannot be increased.
Fig. 9 is a schematic flow chart of transmitting IQ data by a co-frequency dual carrier under a 4 × 1 antenna architecture according to an embodiment of the present invention, and as shown in fig. 9, the flow chart includes the following steps:
step 901: after receiving IQ data of a carrier I and a carrier II of the BBU, a digital intermediate frequency processing module of the RRU copies the IQ data of the carrier I and the carrier II into four paths, and respectively adjusts the phase and the amplitude of the four paths of IQ data of the carrier I and the carrier II;
step 902: a digital intermediate frequency processing module of the RRU carries out parallel processing on the first path of IQ data of the first carrier and the first path of IQ data of the second carrier;
here, the frequencies of the first carrier and the second carrier are the same, so that the digital intermediate frequency processing module of the RRU performs parallel processing on each channel of IQ data of the first carrier and each channel of IQ data of the second carrier, that is, the first carrier and the second carrier are processed simultaneously, and the first carrier and the second carrier are separated, so that the first carrier and the second carrier do not cancel each other.
Step 903: after the processing of the digital intermediate frequency processing module, the first path of IQ data of the first carrier and the first path of IQ data of the second carrier are converted into analog signals through respective digital-to-analog converters respectively;
here, the digital-to-analog converter corresponding to the first carrier converts the I-path data of the first IQ data of the first carrier into an I-path analog signal, and converts the Q-path data of the first IQ data of the first carrier into a Q-path analog signal; and the digital-to-analog converter corresponding to the second carrier converts the I path of data of the first path of IQ data of the second carrier into an I path of analog signal and converts the Q path of data of the first path of IQ data of the second carrier into a Q path of analog signal.
Step 904: combining the I-path data in the first path of IQ data of the carrier I and the I-path data of the first path of IQ data of the carrier II into one path through a combiner; combining the Q path data of the first path IQ of the carrier I and the Q path data of the first path IQ data of the carrier II into one path through a combiner;
step 905: modulating I and Q data obtained by combining the first path of IQ data of the first carrier and the first path of IQ data of the second carrier to radio frequency signals through an IQ modulator;
step 906: after the IQ modulator modulates the radio frequency signal, a filtering power amplifier processing module of the RRU performs filtering, amplification and other processing on the radio frequency signal, converts the radio frequency signal into a radio frequency signal required by an antenna end, and sends the radio frequency signal to the antenna end.
The second, third and fourth paths of IQ data of the first carrier and the second, third and fourth paths of IQ data of the second carrier are all processed in steps 901 to 906, so that transmission of IQ data by the same-frequency dual carriers is realized.
The invention also describes an IQ data processing system comprising a baseband processing unit BBU and a radio remote unit RRU, wherein,
the BBU is used for sending IQ data to the RRU through double carriers;
the RRU is used for carrying out parallel processing on IQ data of the dual-carrier after receiving the IQ data sent by the BBU through the dual-carrier, and carrying out frequency conversion on the dual-carrier into a same-frequency carrier when the dual-carrier is a different-frequency dual-carrier; and modulating the dual carriers with the same frequency into radio frequency signals and outputting the radio frequency signals to an antenna end.
Specifically, the RRU is the RRU described above.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (6)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310213736.2A CN104219020B (en) | 2013-05-31 | 2013-05-31 | IQ data processing method and system of remote radio unit and 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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310213736.2A CN104219020B (en) | 2013-05-31 | 2013-05-31 | IQ data processing method and system of remote radio unit and remote radio unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104219020A CN104219020A (en) | 2014-12-17 |
| CN104219020B true CN104219020B (en) | 2019-10-11 |
Family
ID=51987950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310213736.2A Active CN104219020B (en) | 2013-05-31 | 2013-05-31 | IQ data processing method and system of remote radio unit and remote radio unit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104219020B (en) |
| WO (1) | WO2014190750A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106559110B (en) * | 2015-09-29 | 2020-03-20 | 中国电信股份有限公司 | Active antenna, carrier aggregation method and system |
| CN106027446B (en) * | 2016-05-19 | 2019-06-11 | 京信通信系统（中国）有限公司 | Multi-carrier expansion processing method, apparatus and system |
| TWI664830B (en) * | 2017-04-21 | 2019-07-01 | 財團法人工業技術研究院 | Method for beamforming and control apparatus using the same |
| CN109462438B (en) * | 2019-01-02 | 2020-07-31 | 京信通信系统（中国）有限公司 | Relay network element equipment, remote network element equipment and optical fiber distributed system |
| CN113891503A (en) * | 2020-07-03 | 2022-01-04 | 中兴通讯股份有限公司 | Method, system, equipment and medium for intelligently slicing 5G active room by radio frequency |
| CN115001925B (en) * | 2022-07-01 | 2024-03-19 | 白盒子(上海)微电子科技有限公司 | A MIMO signal demodulation method under radio frequency combining |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1729642A (en) * | 2002-12-19 | 2006-02-01 | 皇家飞利浦电子股份有限公司 | Transmitter diversity method for OFDM system |
| CN101057413A (en) * | 2004-11-12 | 2007-10-17 | 诺基亚公司 | RF transmitter using digital-to-RF conversion |
| CN101436896A (en) * | 2007-11-13 | 2009-05-20 | 中兴通讯股份有限公司 | IQ data transmission method of radio frequency zooming unit |
| CN101651480A (en) * | 2008-08-14 | 2010-02-17 | 华为技术有限公司 | Active antenna, base station, method for refreshing amplitude and phase and signal processing method |
| CN101453799B (en) * | 2007-11-30 | 2010-05-19 | 京信通信系统（中国）有限公司 | Multi-carrier digital frequency-selective radio remote system and its signal processing method |
| CN101932002A (en) * | 2009-06-19 | 2010-12-29 | 中兴通讯股份有限公司 | Method for realizing uplink and downlink transmission rate matching and BBU and RRU |
| EP2299607A2 (en) * | 2009-09-18 | 2011-03-23 | Vodafone Group PLC | Multicarrier transmit diversity in UTRAN for HSPA |
| CN102104390A (en) * | 2009-12-16 | 2011-06-22 | 中国科学院微电子研究所 | Dual Carrier OFDM UWB Transceiver for 6 to 9GHz |
| CN102130697A (en) * | 2010-01-20 | 2011-07-20 | 华为技术有限公司 | Receiver, transmitter and feedback device, transceiver and signal processing method |
| CN102186264A (en) * | 2011-04-12 | 2011-09-14 | 新邮通信设备有限公司 | Remote radio unit and remote ratio method |
| CN102223340A (en) * | 2011-06-20 | 2011-10-19 | 电子科技大学 | Terabit transmission rate coherent light orthogonal frequency division multiplexing (OFDM) system based on optical comb |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101258763B (en) * | 2006-01-12 | 2011-09-14 | 中兴通讯股份有限公司 | Far-end radio frequency unit and annular networking system thereof |
| CN101056313B (en) * | 2007-05-30 | 2013-03-20 | 中兴通讯股份有限公司 | An IQ data transmission method between the BBU and RRU |
-
2013
- 2013-05-31 CN CN201310213736.2A patent/CN104219020B/en active Active
- 2013-12-30 WO PCT/CN2013/090964 patent/WO2014190750A1/en not_active Ceased
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1729642A (en) * | 2002-12-19 | 2006-02-01 | 皇家飞利浦电子股份有限公司 | Transmitter diversity method for OFDM system |
| CN101057413A (en) * | 2004-11-12 | 2007-10-17 | 诺基亚公司 | RF transmitter using digital-to-RF conversion |
| CN101436896A (en) * | 2007-11-13 | 2009-05-20 | 中兴通讯股份有限公司 | IQ data transmission method of radio frequency zooming unit |
| CN101453799B (en) * | 2007-11-30 | 2010-05-19 | 京信通信系统（中国）有限公司 | Multi-carrier digital frequency-selective radio remote system and its signal processing method |
| CN101651480A (en) * | 2008-08-14 | 2010-02-17 | 华为技术有限公司 | Active antenna, base station, method for refreshing amplitude and phase and signal processing method |
| CN101932002A (en) * | 2009-06-19 | 2010-12-29 | 中兴通讯股份有限公司 | Method for realizing uplink and downlink transmission rate matching and BBU and RRU |
| EP2299607A2 (en) * | 2009-09-18 | 2011-03-23 | Vodafone Group PLC | Multicarrier transmit diversity in UTRAN for HSPA |
| CN102104390A (en) * | 2009-12-16 | 2011-06-22 | 中国科学院微电子研究所 | Dual Carrier OFDM UWB Transceiver for 6 to 9GHz |
| CN102130697A (en) * | 2010-01-20 | 2011-07-20 | 华为技术有限公司 | Receiver, transmitter and feedback device, transceiver and signal processing method |
| CN102186264A (en) * | 2011-04-12 | 2011-09-14 | 新邮通信设备有限公司 | Remote radio unit and remote ratio method |
| CN102223340A (en) * | 2011-06-20 | 2011-10-19 | 电子科技大学 | Terabit transmission rate coherent light orthogonal frequency division multiplexing (OFDM) system based on optical comb |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104219020A (en) | 2014-12-17 |
| WO2014190750A1 (en) | 2014-12-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10355769B2 (en) | Narrowband signal transport sub-system for distributed antenna system | |
| US10075252B2 (en) | Telecommunication system using multiple Nyquist zone operations | |
| US9712363B2 (en) | Transmitting circuit, transceiver, communication system, and method for transmitting data | |
| US10785827B2 (en) | Master unit, remote unit and multiband transmission system | |
| US10129821B2 (en) | Multichannel radio frequency apparatus and method | |
| JP2022040055A (en) | Power amplifier power management in user equipment | |
| CN104219020B (en) | IQ data processing method and system of remote radio unit and remote radio unit | |
| US11916577B2 (en) | Systems and methods for duplexer circuits having signal cancellation paths | |
| CN104426829B (en) | A kind of base station retransmission method, relevant device and base station return system | |
| EP3531565A1 (en) | Tower top device and passive intermodulation cancellation method | |
| KR101528324B1 (en) | Donor/remote unit and mobile communication base station system with the same | |
| KR20130103732A (en) | Apparatus and method for a multiband radio operating in a wireless network | |
| US20220303013A1 (en) | Central unit and remote unit | |
| KR20210045726A (en) | Apparatus and method for transmitting and receiving signals on mutiple bands in wireless communication system | |
| CN108649967A (en) | A kind of more servicing transceiver systems in broadband based on zero intermediate frequency chip | |
| CN107211480B (en) | Distributed base station and signal transmission method | |
| US12526751B2 (en) | Multiple antenna transmission to manage radiated power | |
| EP4576640A1 (en) | Sub-band full-duplex communication system and method, and base station | |
| US20250240080A1 (en) | Sensing method, communication apparatus, and communication system | |
| KR20210074739A (en) | Apparatus and method for transmitting and receiving signals on mutiple bands in wireless communication system | |
| EP3111583B1 (en) | Method and apparatus for high data rate communication | |
| KR101400926B1 (en) | Apparatus and method for transmitting/receiving signal | |
| EP4607819A1 (en) | Communication method and apparatus | |
| US20230105730A1 (en) | Beamforming in radio frequency communication systems using frequency division duplexing | |
| US10708012B1 (en) | Wideband subcarrier wireless transceiver circuits and systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |