CN106357310B - Multiple input multiple output signal transmission method and system - Google Patents
Multiple input multiple output signal transmission method and system Download PDFInfo
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- CN106357310B CN106357310B CN201610824337.3A CN201610824337A CN106357310B CN 106357310 B CN106357310 B CN 106357310B CN 201610824337 A CN201610824337 A CN 201610824337A CN 106357310 B CN106357310 B CN 106357310B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a remote radio module which comprises an interface unit for receiving and transmitting baseband signals and a remote radio subunit, wherein the remote radio subunit comprises a signal processing module for being connected with the interface unit, a time delay adjustment module for eliminating time delay difference of the signals, a power amplification module for amplifying the signals, a filtering module for reducing noise of the signals, a receiving and transmitting combining module for combining/branching the signals and a port for transmitting/receiving the signals. Also disclosed is a multiple-input multiple-output signal transmission system employing the remote radio module; a multi-downlink signal transmission control method and a multi-uplink signal transmission control method based on the multi-input multi-output signal transmission system are also disclosed. The multi-input multi-output signal transmission system has low manufacturing cost and good system stability, and the multi-input multi-output signal transmission method realized based on the system effectively improves the signal coverage effect.
Description
Technical Field
The present invention relates to the field of mobile communications, and in particular, to a method and system for transmitting multiple input multiple output signals.
Background
The mobile communication coverage is divided into outdoor coverage and indoor coverage, the outdoor and small building coverage is basically completed by a macro base station, the indoor coverage of a large building is completed by an indoor distribution system, and in recent years, a large amount of outdoor distribution coverage exists in the scenes of residential communities and the like, and the indoor distribution coverage system and the outdoor distribution coverage system are collectively called as a distribution coverage system.
The existing passive distributed coverage system is generally completed by adopting a single radio frequency cable and a single polarized antenna, and two methods are generally adopted to realize the MIMO (multiple input multiple output) technology by the existing passive distributed system. One is to increase the number of radio frequency cables and the number of antennas according to the number of MIMO ports; one frequency conversion mode is that the same frequency MIMO signal is converted into different frequency and then transmitted by one path of radio frequency cable, finally the frequency is converted into original frequency after the antenna is converted into the original frequency and then covered by different antennas, and the mode can be called MIMO frequency conversion distribution coverage system. Such MIMO variable frequency distributed coverage systems generally comprise a base station as a source, an antenna at the far end of the signal, a transmission path for transmitting signals between the base station and the antenna, and an access unit arranged at the side of the transmission path close to the base station and a far end unit arranged at the side of the transmission path close to the antenna.
The MIMO variable frequency distribution coverage system can be further divided into a plurality of modes as shown in fig. 1, 2, 3 and 4, respectively. The mode 1 shown in fig. 1 is characterized by one channel without frequency conversion, but has the disadvantage that the time delay of the frequency conversion signal and the frequency non-conversion signal is poor, which can lead to the great reduction of the performance of the MIMO, especially in the case of commonly adopting 2×2MIMO for indoor distributed coverage. The mode 2 shown in fig. 2 is characterized in that one path does not change frequency, but in order to adjust the delay difference, a delay adjusting module is added to an access unit to adjust the delay so as to solve adverse effects caused by the delay difference, but the mode 2 has the defects that the delay adjusting module needs to bear high power, and has high cost and large implementation difficulty. The mode 3 shown in fig. 3 is characterized by having one channel not frequency-converted, in order to adjust the delay difference, a delay adjustment module is added to the remote unit to adjust the delay of the signal not frequency-converted, but the disadvantage is that the number is large, the cost is high, and the link loss of other systems is increased in the multi-system combining way, so that the coverage of other systems is affected. Mode 4 shown in fig. 4 is characterized in that all ports are subjected to frequency conversion, so that the problem of poor time delay does not exist, but the disadvantage is that the cost is high, the link loss of other systems is increased when the multiple systems are combined, and the coverage of other systems is affected.
All the four MIMO variable frequency distribution coverage systems can not meet the requirements of the existing mobile communication, and therefore, a variable frequency distribution coverage system with better performance and lower cost is needed to better support the application of the MIMO technology.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a multi-input multi-output signal transmission method and a distributed coverage system applying the method.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a multi-downlink signal transmission control method comprises the following steps:
after the base station carries out time delay adjustment on other multipath signals except one path of signal, respectively converting the other multipath signals into signals with different frequencies;
combining the frequency-converted signal with the signal without frequency conversion and then transmitting the combined signal downwards;
branching the transmitted combined signal;
and carrying out frequency reduction on the rest multipath signals subjected to frequency conversion after branching, and respectively transmitting all paths of signals to corresponding antennas to continue descending.
Further, the base station realizes baseband signal processing and radio remote processing, and the downlink multipath signals are subjected to time delay adjustment when subjected to radio remote processing.
Further, the multiplexed signals after the combination are transmitted through one or a combination of radio frequency cables, optical fibers, coaxial cables and passive devices. Preferably, the multiplexed signal after combining is transmitted through a single radio frequency cable and at least one passive device.
Optionally, the downstream multipath signals are subjected to synchronization processing before the combining processing and after the splitting processing so as to ensure that the signals at the antenna end are synchronous with the signals at the base station end.
A multi-uplink signal transmission control method comprises the following steps:
converting the rest multipath signals except one path of signals received by different antennas into signals with different frequencies;
combining the frequency-converted signal with the signal without frequency conversion and then transmitting the combined signal up;
branching the transmitted combined signals and then respectively carrying out frequency restoration;
and respectively performing time delay adjustment on all the signals after the frequency is restored at the base station so as to eliminate the time delay difference among the signals.
Further, the base station realizes baseband signal processing and radio remote processing, and the uplink multipath signals are subjected to time delay adjustment when subjected to radio remote processing.
Further, the multiplexed signals after the combination are transmitted through one or a combination of radio frequency cables, optical fibers, coaxial cables and passive devices. Preferably, the multiplexed signal after combining is transmitted through a single radio frequency cable and at least one passive device.
Optionally, the uplink multipath signals are subjected to synchronization processing before combining processing and after splitting processing so as to ensure that signals at the antenna end are synchronous with signals at the base station end.
The remote radio module comprises an interface unit for receiving and transmitting baseband signals and a remote radio subunit connected with the interface unit, wherein the remote radio subunit comprises a signal processing module, a time delay adjustment module, a power amplification module, a filtering module, a receiving and transmitting combining module and a port, wherein the signal processing module is used for being connected with the interface unit, the time delay adjustment module is used for eliminating time delay difference of signals, the power amplification module is used for amplifying the signals, the filtering module is used for reducing noise of the signals, the receiving and transmitting combining module is used for combining/splitting the signals, and the port is used for transmitting/receiving the signals.
Preferably, the interface unit receives and transmits baseband signals through an optical fiber.
Further, the signal processing module comprises a transmitting signal processing module for processing a baseband signal to be downlink and a receiving signal processing module for processing a radio frequency signal to be uplink.
Further, the delay adjustment module comprises a downlink delay adjustment module for adjusting the delay difference of the downlink signal and an uplink delay adjustment module for adjusting the delay difference of the uplink signal.
Specifically, the power amplification module is a downlink power amplification module for amplifying downlink signals; the filtering module is an uplink low-noise amplifier module for reducing noise of uplink signals. Preferably, the downlink power amplifier module and the uplink low-noise amplifier module are respectively connected with the transceiver combiner module.
More preferably, the remote radio module is provided with a plurality of remote radio subunits, the interface unit is connected with the plurality of remote radio subunits, and each remote radio subunit corresponds to a port for transmitting/receiving signals.
The signal transmission system comprises a base station serving as a signal source, an antenna at the far end of the signal, a transmission channel for transmitting the signal between the base station and the antenna, an access unit arranged at one end of the transmission channel close to the base station and a far end unit arranged at one end of the transmission channel close to the antenna, wherein the base station comprises a baseband processing module and a remote radio module, and the remote radio module adopts any remote radio module.
The access unit realizes the frequency processing of the signals of the base station end: the access unit comprises a plurality of first frequency conversion subunits corresponding to ports of each remote radio module, and each first frequency conversion subunit comprises a downlink frequency conversion module for converting downlink signals and an uplink frequency reduction module for frequency reduction of uplink signals. In order to realize the combined transmission, the access unit further comprises a first multi-frequency combiner for connecting the plurality of first frequency conversion subunits with the transmission channel.
The remote unit performs frequency processing of signals at the antenna end: the remote unit comprises a plurality of second frequency conversion subunits corresponding to each antenna, and each second frequency conversion subunit comprises a downlink frequency reduction module for carrying out frequency reduction on downlink signals and an uplink frequency conversion module for carrying out frequency conversion on uplink signals. In order to realize the combined transmission, the remote unit further comprises a second multi-frequency combiner for connecting a plurality of second frequency conversion subunits with the transmission channel.
In order to adapt to the use of the TDD standard base station, the access unit and the remote unit further comprise a synchronization module for performing synchronization processing on the uplink signal and the downlink signal.
In order to realize remote transmission of signals, the transmission channel is one or a combination of a radio frequency cable, an optical fiber, a coaxial cable and a passive device. Preferably, the transmission channel comprises a single radio frequency cable and at least one passive device.
Compared with the prior art, the invention has the following advantages:
firstly, the method and the system for transmitting the multi-input multi-output signals are characterized in that a time delay adjustment module is arranged at a base station, and the elimination of time delay difference is realized at a base station end, so that the performance of the system can be greatly improved;
secondly, the multi-input multi-output signal transmission method and system of the invention, the time delay adjustment module set in the base station can be realized by using a section of program code, the manufacturing, transformation and maintenance costs are very low, and the loss influence on other systems is small when the multi-system is combined;
finally, the time delay adjustment module is arranged in the base station, so that the system is prevented from using more active modules, the system is more stable, and the covering effect of the multiple inputs and the multiple outputs is not influenced by the faults of the active modules.
Drawings
Fig. 1 is a schematic diagram of a multiple-input multiple-output co-cable transmission system with one path of signal unchanged in frequency and without adjusting delay difference in the prior art.
Fig. 2 is a schematic diagram of a multiple-input multiple-output co-cable transmission system with a single channel signal unchanged in frequency and a near-end adjustment delay difference in the prior art.
Fig. 3 is a schematic structural diagram of a multiple-input multiple-output co-cable transmission system with one channel of signal unchanged in frequency and with a remote adjustment delay difference in the prior art.
Fig. 4 is a schematic structural diagram of a multiple-input multiple-output co-cable transmission system for frequency conversion of all signals in the prior art.
Fig. 5 is a schematic structural diagram of a mimo signal transmission system according to the present invention.
Fig. 6 is a schematic structural diagram of a remote radio module in the mimo signal transmission system according to the present invention.
Fig. 7 is a schematic structural diagram of a base station in the mimo signal transmission system according to the present invention when the base station is a TDD base station.
Detailed Description
The invention is described in further detail below with reference to the drawings and detailed description.
The mimo signal transmission system of the present invention shown with reference to fig. 5 includes a base station 1 as a source, an antenna 5 at a far end of the signal, a transmission path 3 for transmitting the signal between the base station 1 and the antenna 5, and an access unit 2 disposed at an end of the transmission path 3 near the base station 1 and a far end unit 4 disposed at an end of the transmission path 3 near the antenna. The transmission system can realize indoor and outdoor distribution coverage of mobile communication signals.
Referring to fig. 5 and 6, the base station 1 is a distributed base station composed of a baseband processing module 11 (Building Base band Unit, BBU) and a remote radio module 12 (Remote Radio Unit, RRU), which adopts a remote radio technology, separates the baseband processing module and the radio processing module in a conventional base station from each other, and installs an RRU, which is connected to a macro base station or a separate baseband unit (i.e., BBU) through an optical fiber, at one end closer to an antenna. The distributed base station (BBU+RRU mode) has smaller volume, larger capacity, easier installation and stronger adaptability to environment.
Referring to fig. 6, the remote radio module 12 includes an interface unit 121 for receiving and transmitting baseband signals, and a remote radio subunit 12A connected to the interface unit 121.
The interface unit 121 is connected to the baseband processing module 11 through an optical fiber 13 for receiving and transmitting baseband signals.
The remote radio module 12 is provided with a plurality of remote radio subunits 12A connected with the interface unit 121, and each remote radio subunit 12A is composed of a signal processing module 122 connected with the interface unit, a delay adjustment module 123 for eliminating delay differences of signals, a power amplification module for amplifying signals, a filtering module for reducing noise of signals, a transmit-receive combining module 126 for combining/splitting signals, and a port 127 for transmitting/receiving signals.
The signal processing module 122 includes a transmit signal processing module 1221 for processing a baseband signal to be downlink and a receive signal processing module 1222 for processing a radio frequency signal to be uplink. The input end of the transmission signal processing module 1221 and the output end of the reception signal processing module 1222 are respectively connected with the interface unit 121.
Further, the delay adjustment module 123 includes a downstream delay adjustment module 1231 connected to an output of the transmit signal processing module 1221 for adjusting a delay difference of a downstream signal, and an upstream delay adjustment module 1232 connected to an input of the receive signal processing module 1222 for adjusting a delay difference of an upstream signal.
Further, the power amplifier module is a downlink power amplifier module 124 for amplifying a downlink signal, and an input end of each downlink power amplifier module 124 is connected with an output end of each downlink delay adjustment module 1231; the filtering module is an uplink low-noise amplification module 125 for reducing noise of uplink signals, and an output end of each uplink low-noise amplification module 125 is connected with an input end of each uplink delay adjustment module 1232. The output end of the downlink power amplifier module 124 and the input end of the uplink low noise amplifier module 125 are also respectively connected with one of the transceiver combiner modules 126.
Thus, each of the remote subunits 12A forms two links:
downlink link: the device comprises a sending signal processing module 1221, a downlink delay adjusting module 1231, a downlink power amplifier module 124, a transceiver combiner module 126 and a port 127, which provides a downlink for transmitting after converting a baseband signal into a radio frequency signal;
uplink: is composed of the port 127, the transceiver module 126, the uplink low noise amplifier module 125, the uplink delay adjustment module 1232 and the received signal processing module 1222, which provide an uplink for transmitting the rf signal to be converted into the baseband signal later.
In order to make the multiple signals all transmitted through the same radio frequency cable, frequency conversion is needed before the multiple signals enter the radio frequency cable, and frequency recovery is needed after the multiple signals pass through the radio frequency cable.
With continued reference to fig. 5, the access unit 2 includes N-1 first frequency conversion subunits 21 (N is the number of remote subunits) corresponding to the remote subunit 12A, and a first multi-frequency combiner 22. The first frequency conversion subunit 21 includes two sub-ports (not shown), a first sub-transmit-receive combining module 211 and a second sub-transmit-receive combining module 214, which are respectively connected to one sub-port, and a down-conversion module 212 and an up-conversion module 213, which are respectively connected between the first sub-transmit-receive combining module 211 and the second sub-transmit-receive combining module 214. Further, the first sub-transceiver combiner module 211 is connected to the port 127 of the remote radio subunit 12A; the second sub-transceiver combiner module 214 is connected to the first multi-frequency combiner 22.
As shown in fig. 5, the remote unit 4 includes N-1 second frequency conversion subunits 42 (the number of antennas is N) corresponding to the antennas 5, and a second multi-frequency combiner 41. The second frequency conversion subunit 42 includes two sub-ports (not shown), a third sub-transceiver combiner module 421 and a fourth sub-transceiver combiner module 424, which are respectively connected to one sub-port, and a downstream frequency reduction module 422 and an upstream frequency conversion module 423, which are respectively connected between the third sub-transceiver combiner module 421 and the fourth sub-transceiver combiner module 424. Further, the third sub-transceiver combiner module 421 is connected to the second multi-frequency combiner 41; the fourth sub-transceiver module 424 is connected to the antenna 5.
With continued reference to fig. 5, the transmission channel 3 provides a stable transmission medium with shielding function for electromagnetic waves for mobile communication signals. The transmission channel 3 comprises a first channel 31 connecting said base station 1 and said access unit 2, a second channel 32 connecting said access unit 2 and a remote unit 4, and a third channel 33 connecting said remote unit 4 and said antenna 5. Specifically, the first channel 31 is connected between the port 127 of the N-1 remote radio subunits 12A and the sub-port of the first frequency conversion subunit 21 corresponding to the port 127; in this embodiment, the first channel 31 is composed of a transmission line 311 and a coupler 312, where the transmission line 311 is one of a radio frequency cable, an optical fiber, a coaxial cable or other known transmission lines, and the coupler 312 is one of typical known passive devices. Further, the second channel 32 is connected between the first multi-frequency combiner 22 of the access unit 2 and the second multi-frequency combiner 41 of the remote unit 4; in the transmission distribution system, the access unit 2 is close to the base station end, and the remote unit 4 is close to the antenna end, so that the access unit 2 and the remote unit 4 are generally far away from each other, and thus, the second channel 32 is generally a radio frequency cable, preferably a single radio frequency cable, as the second channel 32, from the viewpoints of convenience of wiring construction and stability and safety of signal transmission. Still further, the third channel 33 is connected between the port of each second frequency conversion subunit 42 of the remote unit 4 and the corresponding antenna 5, and in this embodiment, the third channel 33 is connected by a transmission line (radio frequency cable, optical fiber, coaxial cable or other known transmission line), however, it should be understood by those skilled in the art that the third channel 33 may be set up in other known manners.
To optimize the transmission control of the multipath signals, the transmission channel 3 further comprises a fourth channel 34 directly connecting one port 127 of the base station 1 and the first multi-frequency combiner 22 of the access unit 2, and a fifth channel 35 directly connecting the second multi-frequency combiner 41 of the remote unit 4 and one of the antennas 5. The fourth and fifth channels 34, 35 may be provided in a known manner. Thus, the signals transmitted through the fourth and fifth channels 34 and 35 are not subjected to the frequency conversion processing and the frequency reduction processing.
Referring to fig. 7, when the base station 1 adopts a time division duplex (Time Division Duplexing, TDD) system, the remote radio module is a TDD mode remote radio module 13. In a mobile communication system in TDD mode, different time slots of the same frequency channel (i.e., carrier) are received and transmitted to ensure time to separate, receive and transmit channels. Thus, to ensure the synchronicity of the signals at the base station and the antenna, the access unit 2 needs to be provided with a first synchronization module 23, and simultaneously, the remote unit 4 needs to be provided with a second synchronization module 43, and the synchronization processing is performed before the multi-frequency combiner and after the splitting processing to ensure the synchronization of the signals at the antenna and the base station.
With continued reference to fig. 5 and 6, the control method for multi-path signal transmission according to the present invention includes a method for transmission control of multi-downlink signals and a method for transmission control of multi-uplink signals based on the mimo signal transmission system of the present invention. The two transmission control methods are described below.
The downlink signal generally refers to a signal sent from a base station end to a receiving antenna at a far end, and when one base station corresponds to a plurality of receiving antennas, a plurality of downlink signals are formed. The transmission control method of the multi-downlink signal comprises the following steps:
(1) The downlink baseband signals are transmitted from the baseband processing module 11 of the base station 1 to the interface unit 121 of the remote radio module 12 through the optical fiber 13, and the interface unit 121 divides the downlink baseband signals into N paths of downlink baseband signals which respectively pass through each remote radio subunit 12A;
(2) The downlink baseband signal transmitted to each remote radio unit 12A is converted into a downlink radio signal by the transmission signal processing module 1221, the downlink radio signal is sequentially processed by the downlink delay adjustment module 1231 and the downlink power amplification module 124, the downlink radio signal after delay adjustment and power amplification is combined by the transmit-receive combining module 126 to be processed into a primary combined signal, and then the primary combined signal is output by the port 127, and N-1 paths of the primary combined signal are transmitted to the first frequency conversion subunit 21 of the access unit 2 through the first channel 31; the remaining primary combined signal is directly transmitted to the first multi-frequency combiner 22 through the fourth channel 34;
(3) The first sub-transceiver combiner module 211 of the first frequency conversion subunit 21 separates the primary combined signal into a downlink signal, and the downlink frequency conversion module 212 performs frequency conversion on the separated downlink signal;
(4) The first multi-frequency combiner 22 combines the N-1 downlink signal after frequency conversion and one primary combined signal without frequency conversion into a secondary combined signal, and the secondary combined signal is transmitted to the second multi-frequency combiner 41 of the remote unit 4 through the second channel 32;
(5) The second multi-frequency combiner 41 separates the secondary combined signal into a down signal after frequency conversion and a primary combined signal without frequency conversion;
(6) The downlink frequency reduction module 422 performs frequency reduction on the downlink signal after frequency conversion, and then continues to downlink to the corresponding antenna 5 through the third channel 33; the primary combined signal without frequency conversion directly goes down to the corresponding antenna 5 through the fifth channel 35.
The uplink signal generally refers to a signal transmitted from a receiving antenna to a base station, and when a plurality of receiving antennas correspond to one base station, multiple uplink signals are formed. The transmission control method of the multi-uplink signal comprises the following steps:
(1) N uplink signals are received by different antennas 5, wherein N-1 uplink signals are transmitted to the second frequency conversion subunit 42 of the corresponding remote unit 4 through the third channel 33, and one uplink signal is directly transmitted to the second multi-frequency combiner 41 through the fifth channel 35;
(2) The uplink signal transmitted to each second frequency conversion subunit 42 is subjected to frequency conversion by the uplink frequency conversion module 423;
(3) The second multi-frequency combiner 41 combines the converted N-1 uplink signal and one non-converted uplink signal into a combined signal, and then transmits the combined signal to the first multi-frequency combiner 22 of the access unit 2 through the second channel 32;
(4) The first multi-frequency combiner 22 separates the combined signal into N uplink signals again, which include N-1 uplink signals subjected to frequency conversion processing and one uplink signal not subjected to frequency conversion processing;
(5) The uplink frequency reduction module 213 of the first frequency conversion subunit 21 of the access unit 2 performs frequency reduction on the frequency-converted uplink signal, and then uplink to the base station 1 through the first channel 31; the non-converted uplink signal is directly uplink to the base station 1 through the fourth channel 34;
(6) Each remote radio subunit 12A in the base station 1 correspondingly receives one path of the uplink signal, the uplink signal enters the remote radio subunit 12A by taking the port 127 and the transceiver combiner module 126 as inlets, and the uplink signal sequentially passes through the uplink low noise amplifier module 125 and the uplink time delay adjustment module 1232 to reduce noise in the uplink signal and eliminate time delay difference between the uplink signals;
(7) The uplink signal after noise reduction and delay adjustment is converted from a radio frequency signal to a baseband signal in the received signal processing module 1222, and the N uplink baseband signals are summarized by the interface unit 121 and transmitted to the baseband processing module 11 through the optical fiber 13 to analyze and process the uplink signal.
Further, when the base station 1 is a base station in TDD mode, in order to ensure that the transmission and reception of the uplink and downlink variable frequency signals are synchronous with the base station signal, the uplink and downlink variable frequency signals entering the access unit 2 need to be processed by using the synchronization process of the first synchronization module 23; the up-down converted signal entering the remote unit 4 needs to be synchronized by the second synchronization module 43 (as shown in fig. 7).
In summary, the mimo signal transmission system of the present invention has low cost and good system stability, and the mimo signal transmission method implemented based on the system effectively improves the signal coverage effect.
The above embodiments are preferred embodiments of the present invention, but are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made therein and are intended to be equivalent substitutions within the scope of the present invention.
Claims (25)
1. The multi-downlink signal transmission control method is characterized by comprising the following steps:
after the base station carries out time delay adjustment on other multipath signals except one path of signal, respectively converting the other multipath signals into signals with different frequencies;
combining the frequency-converted signal with the signal without frequency conversion and then transmitting the combined signal downwards;
branching the transmitted combined signal;
and carrying out frequency reduction on the rest multipath signals subjected to frequency conversion after branching, and respectively transmitting all paths of signals to corresponding antennas to continue descending.
2. The multi-downlink signal transmission control method as claimed in claim 1, wherein: the base station realizes baseband signal processing and radio remote processing, and the downlink multipath signals are subjected to time delay adjustment during the radio remote processing.
3. The multi-downlink signal transmission control method as claimed in claim 1, wherein: the combined multipath signals are transmitted through one or a combination of a radio frequency cable, an optical fiber, a coaxial cable and a passive device.
4. The multi-downlink signal transmission control method as claimed in claim 3, wherein: the combined multipath signals are transmitted through a single radio frequency cable and at least one passive device.
5. The multi-downlink signal transmission control method as claimed in claim 1, wherein: and the downstream multipath signals are subjected to synchronous processing before combining processing and after branching processing so as to ensure that signals at the antenna end are synchronous with signals at the base station end.
6. The multi-uplink signal transmission control method is characterized by comprising the following steps of:
converting the rest multipath signals except one path of signals received by different antennas into signals with different frequencies;
combining the frequency-converted signal with the signal without frequency conversion and then transmitting the combined signal up;
branching the transmitted combined signals and then respectively carrying out frequency restoration;
and respectively performing time delay adjustment on all the signals after the frequency is restored at the base station so as to eliminate the time delay difference among the signals.
7. The multi-uplink signal transmission control method according to claim 6, wherein: and the base station realizes baseband signal processing and radio remote processing, and the uplink multipath signals are subjected to time delay adjustment during the radio remote processing.
8. The multi-uplink signal transmission control method according to claim 6, wherein: the combined multipath signals are transmitted through one or a combination of a radio frequency cable, an optical fiber, a coaxial cable and a passive device.
9. The multi-uplink signal transmission control method according to claim 8, wherein: the combined multipath signals are transmitted through a single radio frequency cable and at least one passive device.
10. The multi-uplink signal transmission control method according to claim 6, wherein: and the uplink multipath signals are subjected to synchronous processing before combining processing and after branching processing so as to ensure that signals at the antenna end are synchronous with signals at the base station end.
11. The utility model provides a remote radio module which characterized in that: the device comprises an interface unit for receiving and transmitting baseband signals and a plurality of remote radio subunits connected with the interface unit, wherein the remote radio subunits comprise a signal processing module, a time delay adjustment module, a power amplification module, a filtering module, a receiving and transmitting combination module and a port, wherein the signal processing module is used for being connected with the interface unit, the time delay adjustment module is used for eliminating time delay difference of signals, the power amplification module is used for amplifying the signals, the filtering module is used for reducing noise of the signals, the receiving and transmitting combination module is used for combining/splitting the signals, and the port is used for transmitting/receiving the signals;
the signal processing module comprises a transmitting signal processing module and a receiving signal processing module, and the input end of the transmitting signal processing module and the output end of the receiving signal processing module are respectively connected with the interface unit; the time delay adjusting module comprises a downlink time delay adjusting module connected with the output end of the signal sending processing module and an uplink time delay adjusting module connected with the input end of the signal receiving processing module; the power amplification module comprises a downlink power amplification module, and the input end of the downlink power amplification module is connected with the output end of the downlink delay adjustment module; the filtering module comprises an uplink low-noise amplification module, and the output end of the uplink low-noise amplification module is connected with the uplink delay adjustment input end; the output end of the downlink power amplifier module and the input end of the uplink low-noise amplifier module are respectively connected with the receiving and transmitting combining module;
the downlink transmission control method of the baseband signal comprises the steps that the interface unit receives downlink baseband signals and then divides the downlink baseband signals into multiple paths of downlink baseband signals, the multiple paths of downlink baseband signals are converted into downlink radio frequency signals through the signal processing module, the downlink radio frequency signals are processed through the downlink delay adjusting module and the downlink power amplifier module in sequence, and then are transmitted out through the port after being combined through the receiving and transmitting combining module;
the uplink transmission control method of the baseband signal comprises the steps that each remote radio subunit receives an uplink signal, the uplink signal takes the port and the receiving and transmitting combining module as an inlet, and the uplink signal sequentially passes through the uplink low-noise amplifying module and the uplink time delay adjusting module and then is converted into the baseband signal through the signal processing module, and the baseband signal is collected by the interface unit and then is sent.
12. The remote radio module of claim 11, wherein: the interface unit receives and transmits baseband signals through an optical fiber.
13. The remote radio module of claim 11, wherein: the signal processing module comprises a transmitting signal processing module for processing a baseband signal to be downlink and a receiving signal processing module for processing a radio frequency signal to be uplink.
14. The remote radio module of claim 11, wherein: the time delay adjustment module comprises a downlink time delay adjustment module for adjusting the time delay difference of the downlink signal and an uplink time delay adjustment module for adjusting the time delay difference of the uplink signal.
15. The remote radio module of claim 11, wherein: the power amplification module is a downlink power amplification module for amplifying downlink signals; the filtering module is an uplink low-noise amplifier module for reducing noise of uplink signals.
16. The remote radio module of claim 15, wherein: and the downlink power amplifier module and the uplink low-noise amplifier module are respectively connected with the receiving and transmitting combination module.
17. The remote radio module of claim 11, wherein: the remote radio module is provided with a plurality of remote radio subunits, the interface unit is connected with the remote radio subunits, and each remote radio subunit corresponds to a port for transmitting/receiving signals.
18. A multiple-input multiple-output signal transmission system, which includes a base station as a source, an antenna at a far end of the signal, a transmission channel for transmitting the signal between the base station and the antenna, an access unit disposed at an end of the transmission channel near the base station, and a far end unit disposed at an end of the transmission channel near the antenna, the base station including a baseband processing module and a remote radio module, characterized in that: the signal transmission system is configured to implement the multi-downlink signal transmission control method according to any one of claims 1 to 5 or the multi-uplink signal transmission control method according to any one of claims 6 to 10.
19. The multiple-input multiple-output signal transmission system of claim 18, wherein: the access unit comprises a plurality of first frequency conversion subunits corresponding to ports of each remote radio module, and each first frequency conversion subunit comprises a downlink frequency conversion module for converting downlink signals and an uplink frequency reduction module for frequency reduction of uplink signals.
20. The multiple-input multiple-output signal transmission system of claim 19, wherein: the access unit further comprises a first multi-frequency combiner connecting the plurality of first frequency conversion subunits with the transmission channel.
21. The multiple-input multiple-output signal transmission system of claim 18, wherein: the remote unit comprises a plurality of second frequency conversion subunits corresponding to each antenna, and each second frequency conversion subunit comprises a downlink frequency reduction module for carrying out frequency reduction on downlink signals and an uplink frequency conversion module for carrying out frequency conversion on uplink signals.
22. The multiple-input multiple-output signal transmission system of claim 21, wherein: the remote unit further comprises a second multi-frequency combiner connecting the plurality of second frequency conversion subunits with the transmission channel.
23. The multiple-input multiple-output signal transmission system of claim 18, wherein: the access unit and the remote unit further comprise a synchronization module for performing synchronization processing on the uplink signal and the downlink signal.
24. The multiple-input multiple-output signal transmission system of claim 18, wherein: the transmission channel is one or a combination of a radio frequency cable, an optical fiber, a coaxial cable and a passive device.
25. The multiple-input multiple-output signal transmission system of claim 24, wherein: the transmission channel includes a single radio frequency cable and at least one passive device.
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| CN109547105B (en) * | 2017-09-22 | 2021-11-02 | 罗森伯格（上海）通信技术有限公司 | Communication equipment for realizing MIMO transmission |
| CN107819483B (en) * | 2017-11-02 | 2019-03-19 | 京信通信系统（中国）有限公司 | Signal transmitting apparatus and its test equipment, repeater communication equipment |
| WO2021133243A1 (en) * | 2019-12-23 | 2021-07-01 | Aoao Global Pte Ltd | Apparatuses, system and methods for mimo transmission in a wireless communication system |
| CN110988918B (en) * | 2019-12-25 | 2022-03-01 | 中电科航空电子有限公司 | Airborne position tracking equipment and positioning method |
| CN113938140A (en) * | 2021-09-30 | 2022-01-14 | 京信网络系统股份有限公司 | Remote transmission covering method, system and remote unit |
| CN114286355B (en) * | 2021-12-30 | 2024-03-22 | 陕西天基通信科技有限责任公司 | Active remote unit and indoor coverage system based on same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202841526U (en) * | 2012-08-01 | 2013-03-27 | 京信通信技术(广州)有限公司 | Variable frequency combiner, its master hub unit (MHU) and radio remote unit (RRU) |
| CN104301909A (en) * | 2014-05-05 | 2015-01-21 | 河南普世通信科技有限公司 | Indoor distribution system MIMO single cable covering method and system |
| WO2016019843A1 (en) * | 2014-08-06 | 2016-02-11 | 华为技术有限公司 | Multi-antenna implementation method, device and system |
-
2016
- 2016-09-14 CN CN201610824337.3A patent/CN106357310B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202841526U (en) * | 2012-08-01 | 2013-03-27 | 京信通信技术(广州)有限公司 | Variable frequency combiner, its master hub unit (MHU) and radio remote unit (RRU) |
| CN104301909A (en) * | 2014-05-05 | 2015-01-21 | 河南普世通信科技有限公司 | Indoor distribution system MIMO single cable covering method and system |
| WO2016019843A1 (en) * | 2014-08-06 | 2016-02-11 | 华为技术有限公司 | Multi-antenna implementation method, device and system |
| CN105337646A (en) * | 2014-08-06 | 2016-02-17 | 华为技术有限公司 | Multi-antenna implementation method, device and system |
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