CN107493600A - A kind of massive MIMO communication devices and synchronous method - Google Patents
A kind of massive MIMO communication devices and synchronous method Download PDFInfo
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- CN107493600A CN107493600A CN201610410919.7A CN201610410919A CN107493600A CN 107493600 A CN107493600 A CN 107493600A CN 201610410919 A CN201610410919 A CN 201610410919A CN 107493600 A CN107493600 A CN 107493600A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2609—Arrangements for range control, e.g. by using remote antennas
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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Abstract
The invention discloses a kind of massive MIMO communication devices and synchronous method, it is related to wireless communication field, methods described includes：Main control unit utilizes external clock synchronisation source, generates system clock, and the system clock of generation is distributed into baseband processing unit；The baseband processing unit utilizes the system clock, generates local clock, and the local clock generated is passed into connected radio frequency and antenna element；The radio frequency and antenna element choose a clock from the local clock from the baseband processing unit received, and utilize selected clock, realize synchronous with the baseband processing unit clock.By solving the problems, such as the high-precise synchronization of a large amount of distributed radio frequencies and antenna element, performance in wireless communication systems is lifted.
Description
Technical field
The present invention relates to wireless communication field, more particularly to a kind of extensive multiple-input and multiple-output (massive
Multiple Input Multiple Output, massive MIMO) communication device and synchronous method.
Background technology
Fig. 1 is the traditional distributed base station architecture figure that prior art provides, as shown in figure 1, traditional base station transceiver bag
Containing baseband processing unit and radio frequency and antenna element, each radio frequency and antenna element use 2~8 antennas.
Massive MIMO are as the 5th third-generation mobile communication technology (The 5th Generation Mobile
Communication Technology, 5G) technology a kind of core technology, by base station transceiver (Base
Transceiver Station, BTS) on using a large amount of antennas (such as 64,128 or more than 256) realize bigger nothing
Line data traffic and connection reliability.This mode fundamentally changes the base station transceiver framework of existing standard, existing
The base station transceiver framework of standard is at most only using 8 fan-shaped topologys of antenna composition.
Due to using more antenna element, massive mimo systems face the system that existing network never runs into and chosen
War.For example, how to be synchronized between numerous independent RF transceivers (i.e. radio frequency and antenna element)；Baseband processing unit with
RF processing unit (i.e. radio frequency and antenna element) uses distributed synchronization framework, how to make indoor baseband processing unit
It is synchronous and meet to assist between (Building Baseband Unit, BBU) and each radio frequency unit (i.e. radio frequency and antenna element)
Discuss precision prescribed.
Based on different time service modes, main Clock Synchronization Technology can be divided into synchronous (the general designation worldwide navigation of satellite clock
Satellite system (Global Navigation Satellite System, GNSS), including global positioning system (Global
Positioning System, GPS) time dissemination system, Big Dipper time dissemination system etc.) and network clocking synchronization (including Network Synchronization association
Discuss (Network Time Protocol, NTP) and IEEE1588V2 network synchronization protocols etc.).How these time service modes are applied
Distributed radio frequency units (i.e. radio frequency and antenna element) synchronization accuracy is set to meet the problem of MIMO required precisions are also urgent need to resolve.
The content of the invention
The technical problem that the technical scheme provided according to embodiments of the present invention solves is to realize a large amount of distributed radio frequencies and day
The high precision clock of line unit is synchronous.
A kind of synchronous method of the massive MIMO communication devices provided according to embodiments of the present invention, including：
Main control unit utilizes external clock synchronisation source, generates system clock, and the system clock of generation is distributed into base band
Processing unit；
The baseband processing unit utilizes the system clock, generates local clock, and the local clock generated is passed
Pass connected radio frequency and antenna element；
When the radio frequency and antenna element choose one from the local clock from the baseband processing unit received
Clock, and selected clock is utilized, realize synchronous with the baseband processing unit clock.
Preferably, the main control unit utilizes external clock synchronisation source, generates system clock, and by the system clock of generation
The step of being distributed to baseband processing unit includes：
The main control unit utilizes external clock synchronisation source, its local clock is adjusted, when making the local after adjustment
Clock is synchronous with the external clock synchronisation source clock；
Using the local clock after the adjustment, system clock is generated, and via clock and data transmission unit by described in
The system clock of generation is distributed to each baseband processing unit.
Preferably, when the external clock synchronisation source is global navigation satellite system GNSS or network synchronization protocols 1588V2
Clock.
Preferably, the local clock of the baseband processing unit generation is by carrying out debounce to the system clock received
And live again what processing obtained.
Preferably, the baseband processing unit is to the system clock progress debounce received and the sheet obtained after processing of living again
Ground clock is the clock being adapted with the transmission rate of its optical port, and the baseband processing unit will be resulting via corresponding optical port
Local clock passes to connected radio frequency and antenna element.
Preferably, the radio frequency and antenna element are chosen from the local clock from the baseband processing unit received
One clock, and selected clock is utilized, realize that the step synchronous with the baseband processing unit clock includes：
Recover to be derived from the base band in each optical port that the radio frequency and antenna element are connected from it with baseband processing unit
The local clock of processing unit；
The radio frequency and antenna element carry out optical port arbitration process, obtained according to the state and sequence number of each optical port
To a main light port；
The radio frequency and antenna element utilize the local clock recovered from the main light port, generate work clock, make institute
It is synchronous with the baseband processing unit clock to state work clock.
Preferably, the work clock of the radio frequency and antenna element generation is by from the local that the main light port is recovered
Clock carries out debounce and lives again what processing obtained.
The storage medium provided according to embodiments of the present invention, it is stored for realizing above-mentioned massive MIMO communication devices
Synchronous method program.
A kind of massive MIMO communication devices provided according to embodiments of the present invention, including：
Main control unit, for utilizing external clock synchronisation source, system clock is generated, and the system clock of generation is distributed to
Baseband processing unit；
Baseband processing unit, for utilizing the system clock, local clock is generated, and the local clock generated is passed
Pass connected radio frequency and antenna element；
Radio frequency and antenna element, for from the local clock from the baseband processing unit received choose one when
Clock, and selected clock is utilized, realize synchronous with the baseband processing unit clock.
Preferably, the main control unit utilizes external clock synchronisation source, its local clock is adjusted, after making adjustment
Local clock is synchronous with the external clock synchronisation source clock, and utilizes the local clock after the adjustment, generates system clock,
The system clock of the generation is distributed to each baseband processing unit via clock and data transmission unit.
Preferably, when the external clock synchronisation source is global navigation satellite system GNSS or network synchronization protocols 1588V2
Clock.
Preferably, the local clock of the baseband processing unit generation is by carrying out debounce to the system clock received
And live again what processing obtained.
Preferably, the baseband processing unit is to the system clock progress debounce received and the sheet obtained after processing of living again
Ground clock is the clock being adapted with the transmission rate of its optical port, and the baseband processing unit will be resulting via corresponding optical port
Local clock passes to connected radio frequency and antenna element.
Preferably, recover to be derived from institute in each optical port that the radio frequency and antenna element are connected from it with baseband processing unit
The local clock of baseband processing unit is stated, according to the state and sequence number of each optical port, optical port arbitration process is carried out, obtains
One main light port, and using the local clock recovered from the main light port, generate work clock, make the work clock and institute
State the synchronization of baseband processing unit clock.
Preferably, the work clock of the radio frequency and antenna element generation is by from the local that the main light port is recovered
Clock carries out debounce and lives again what processing obtained.
Technical scheme provided in an embodiment of the present invention has the advantages that：
Massive MIMO communication devices provided in an embodiment of the present invention and synchronous method, realize simply, can effectively solve
Clock synchronization issue between certainly multiple Remote Radio Unit (Remote Radio Unit, RRU), synchronization accuracy is high, Neng Gouyou
The performance of effect lifting wireless communication system.
Brief description of the drawings
Fig. 1 is the traditional distributed base station architecture figure that prior art provides；
Fig. 2 is the synchronous method theory diagram of massive MIMO communication devices provided in an embodiment of the present invention；
Fig. 3 is the first hardware block diagram of massive MIMO communication devices provided in an embodiment of the present invention；
Fig. 4 is second hardware block diagram of massive MIMO communication devices provided in an embodiment of the present invention；
Fig. 5 is the synchronous flow chart of Fig. 4 described devices；
Fig. 6 is the high-level schematic functional block diagram of the baseband processing unit of Fig. 4 described devices；
Fig. 7 is that block diagram is realized in the radio frequency of Fig. 4 described devices and the inside of antenna element；
Fig. 8 is the application scenarios schematic diagram for corresponding 1 RRU of 2 BBU that another embodiment of the present invention provides；
Fig. 9 is the application scenarios schematic diagram for corresponding 3 RRU of 2 BBU that another embodiment of the present invention provides.
Embodiment
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail, it will be appreciated that described below is excellent
Select embodiment to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Fig. 2 is the synchronous method theory diagram of massive MIMO communication devices provided in an embodiment of the present invention, such as Fig. 2 institutes
Show, step includes：
Step S101：Main control unit utilizes external clock synchronisation source, generates system clock, and the system clock of generation is divided
Issue baseband processing unit.
Main control unit utilizes external clock synchronisation source, and to its, local clock is adjusted, when making local after adjustment
Clock is synchronous with external clock synchronisation source clock, then using the local clock after adjustment, generates system clock, and via clock
And the system clock of generation is distributed to each baseband processing unit by data transmission unit.
Wherein, the external clock synchronisation source can be GNSS, such as global positioning system (Global Positioning
System, GPS) time dissemination system, Big Dipper time dissemination system etc. or IEEE1588V2 clocks.
Step S102：Baseband processing unit utilizes system clock, generates local clock, and the local clock generated is passed
Pass connected radio frequency and antenna element.
Baseband processing unit carries out debounce and processing of living again to the system clock received, obtains the transmission rate with optical port
Adaptable local clock, and pass the local clock to connected radio frequency and antenna element via corresponding light oral instructions.
Step S103：When radio frequency and antenna element choose one from the local clock from baseband processing unit received
Clock, and selected clock is utilized, realize synchronous with baseband processing unit clock.
Recover to be derived from baseband processing unit in each optical port that radio frequency and antenna element are connected from it with baseband processing unit
The local clock, and according to the state and sequence number of each optical port, carry out optical port arbitration process, obtain a main light port,
So as to using the clock that recovers from main light port, generate work clock, i.e., debounce and again is carried out to the clock recovered from main light port
Raw processing obtains work clock, makes work clock synchronous with baseband processing unit clock.
Main control unit, clock and data penetration transmission unit and baseband processing unit the composition BBU network elements of the present embodiment, this implementation
The radio frequency and antenna element of example are RRU network elements, and the annexation of BBU network elements and RRU network elements can be one-to-one, one-to-many, more
To one and multi-to-multi, and the synchronization accuracy under various connected modes all meets the synchronous requirement of mimo system.
Can be with it will appreciated by the skilled person that realizing that all or part of step in above-described embodiment method is
The hardware of correlation is instructed to complete by program, described program can be stored in computer read/write memory medium, should
Program upon execution, including step S101 to step S103.Wherein, described storage medium can be ROM/RAM, magnetic disc, light
Disk etc..
Fig. 3 is the first hardware block diagram of massive MIMO communication devices provided in an embodiment of the present invention, as shown in figure 3,
Including：
Main control unit, for utilizing external clock synchronisation source, system clock is generated, and the system clock of generation is distributed to
Baseband processing unit, the external clock synchronisation source can be GNSS, such as global positioning system (Global Positioning
System, GPS) time dissemination system, Big Dipper time dissemination system etc. or IEEE1588V2 clocks.Specifically, main control unit profit
With external clock synchronisation source, its local clock is adjusted, makes the local clock after adjustment and external clock synchronisation source clock
It is synchronous, and using the local clock after adjustment, generate system clock, during via clock and data transmission unit by the system of generation
Clock is distributed to each baseband processing unit.Furtherly, main control unit is in the synchronization of generation system clock, the also synchronous triggering of generation
Signal, and the synchronous triggering signal is distributed to each baseband processing unit via clock and data transmission unit.
Baseband processing unit, for using system clock, generating local clock, and the local clock generated is passed to
Connected radio frequency and antenna element.Specifically, baseband processing unit carries out debounce and again to the system clock that is received
Raw processing, obtains being adapted to the local clock of the transmission rate of its optical port, and via corresponding optical port by resulting local clock
Pass to connected radio frequency and antenna element.Furtherly, baseband processing unit is while system clock is received, from when
Clock and data transmission unit receive synchronous triggering signal, and baseband processing unit enters line number using local clock and synchronous triggering signal
According to processing and optical port data transmit-receive.
Radio frequency and antenna element, for choosing a clock from the local clock from baseband processing unit received,
And selected clock is utilized, realize synchronous with baseband processing unit clock.Specifically, radio frequency and antenna element are from itself and base
Recover the local clock from baseband processing unit in each optical port of tape handling unit connection, according to the state of each optical port and
Sequence number, optical port arbitration process is carried out, obtain a main light port, and using the local clock recovered from main light port, generate work
Make clock, i.e., debounce carried out to the local clock recovered from main light port and processing of living again obtains work clock, make work clock with
Baseband processing unit clock is synchronous.Furtherly, radio frequency and antenna element from each optical port extract clock while, further from
Optical port extracts synchronous triggering signal and data, radio frequency and antenna element are entered using work clock and synchronous triggering signal to the data
Row data processing and data transmit-receive.
Fig. 4 is second hardware block diagram of massive MIMO communication devices provided in an embodiment of the present invention, as shown in figure 4, institute
State device and be divided into BBU and RRU, the annexation between BBU network elements and RRU network elements can be one-to-one, one-to-many, many-one and
Multi-to-multi.Wherein, BBU Base Band Unit include main control unit, clock and data transmission unit (i.e. clock and data penetration transmission unit or
Clock and file distributing unit) and one or more baseband processing units, RRU radio frequency units are radio frequency and antenna element, comprising
Intermediate frequency and radio frequency processing module (rf data processing module in i.e.).The present embodiment realizes BBU Base Band Unit and radio frequency and antenna
Synchronous transmission and Processing Interface between unit.
Massive MIMO communication device hardware block diagrams provided by the invention are shown in such as Fig. 2.Device is broadly divided into BBU and RRU.
BBU Base Band Unit, include main control unit, clock and file distributing unit and baseband processing unit；RRU radio frequency units, i.e. radio frequency
And antenna element, include intermediate frequency, radio frequency processing.The Core Feature part of the present invention is BBU baseband processing units and radio frequency and day
Synchronous transmission and Processing Interface between line unit.
Main control unit is responsible for generation system clock and data distribution.System clock uses GNSS/1588V2 sync identification sides
Formula adjusts and tracking.Main control unit produces clock signal and synchronous triggering signal according to system clock, passes to clock and data
Transparent transmission unit.
Clock and data penetration transmission unit, each Base-Band Processing is given clock signal, synchronous triggering signal and data distribution
Unit.
Baseband processing unit is responsible for business data processing and optical port transmission.Baseband processing unit is according to clock and data penetration transmission
The clock and trigger signal of unit transmission produce local work clock (i.e. local clock) and timing (i.e. synchronous triggering signal), use
In establishment downlink service data, and radio frequency and antenna element are passed the data to by optical port.
Radio frequency and antenna element have multiple optical ports and multiple antennas, can receive multiple baseband boards (i.e. baseband processing unit)
Data.RF processing unit (i.e. radio frequency and antenna element) selects one from multiple optical ports being connected with baseband board and is used as key light
Mouth extraction clock and synchronization timing (i.e. synchronous triggering signal).Using above-mentioned recovered clock as benchmark, data are sent to eating dishes without rice or wine.Its
In, the main light port selection of radio frequency and antenna element can be according to one of the condition of the on off operating mode of optical port as prioritizing selection.
The RRU network elements of the present embodiment use integrated radio-frequency transceiver, have more optical ports and support multiple antennas, further
Ground, RRU network elements have N number of optical port, can be at most connected with N number of BBU, wherein N >=6, preferably 6.
The integrated radio-frequency transceiver of the present embodiment, selects main light port from multiple optical ports, and obtains clock and synchronization
Trigger signal.
The integrated radio-frequency transceiver of the present embodiment, using fixed buffer cache baseband processing unit data, use master
The clock that optical port is recovered is read out and handled, the time using the synchronous triggering signal that main light port is recovered as transceiving data.
Fig. 5 is the synchronous flow chart of Fig. 4 described devices, as shown in figure 5, main control unit uses GNSS/1588V2 time service sides
Formula adjusts local clock and timing, generation system clock and timing pip (i.e. synchronous triggering signal), pass to clock and
Data penetration transmission unit；Clock and data penetration transmission unit distribution clock and synchronous triggering signal give each baseband processing unit；Receive
After clock and synchronous triggering signal, baseband processing unit using clock adjustment local clock and timing signal, after synchronization when
Clock and timing signal are used to handling and receiving and dispatching base band data, then radio frequency and antenna element are passed to by optical fiber, such as Fig. 6 institutes
Show；Radio frequency and antenna element distinguish recovered clock and timing signal by agreement from multiple optical ports, while data are stored in
buffer；Main light port is selected according to arbitration, radio frequency processing in being carried out using the clock and timing signal of main light port to all data,
As shown in Figure 7.Specific steps include：
Step S201：It is electric on main control unit, clock and file distributing unit and radio frequency and antenna element.Wherein, master control list
In member after electricity, electricity on baseband processing unit is controlled.
Step S202：After main control unit detects that GNSS or 1588v2 clock references are available, local VCXO is adjusted
Output frequency and clock timing synchronization are in GNSS or 1588V2 master clocks；After synchronization, generation system work clock is (i.e.
System clock, such as 61.44M) and synchronous triggering signal (such as 10ms pulses).Main control unit is by caused system clock and synchronization
Trigger signal sends clock and data penetration transmission unit to.To improve transmission reliability, system clock and synchronous triggering signal are all adopted
With differential pair signal come anti-interference.
Step S203：Clock and data penetration transmission unit by the system clock received and synchronous triggering signal, data distribution to
Each baseband processing unit.
Similarly, in order to improve transmission reliability, system clock and synchronous triggering signal are all resisted using differential pair signal
Interference.
Step S204：Baseband processing unit receives clock and data penetration transmission unit distributes the system clock to come and timing is touched
Signal after (i.e. synchronous triggering signal), debounce carried out to system clock and lived again, produces local work clock (i.e. local clock),
For data framing/solution frame processing and the processing of optical port transceiving data；Meanwhile baseband processing unit uses the synchronous triggering received
Signal ensures that data origination is alignd with reference synchronization trigger signal as framing or the timing signal of data processing.
Fig. 6 is the high-level schematic functional block diagram of the baseband processing unit of Fig. 4 described devices, as shown in fig. 6, baseband processing unit
After receiving clock and the system clock and synchronous triggering signal of the transmission of data penetration transmission unit, its debounce and processing module of living again first
Debounce is carried out to system clock to live again, obtains the local clock after synchronization, when then its data solution frame/framing module utilizes local
The data that clock and synchronous triggering signal pair interact with upstream equipment carry out framing processing, last its optical port transmission/reception module profit
The data exported with local clock and synchronous triggering signal to data solution frame/framing module carry out optical port data transmission.
Step S205：Radio frequency and antenna processing unit are stored in data and delayed respectively from multiple optical port data recovery clocks
Rush in area, a main light port is then selected according to arbitration, using the data of the Clockreading buffering area of main light port, and uses key light
The synchronous triggering signal adjustment data transmit-receive moment that mouth recovers.
Fig. 7 is that block diagram is realized in the radio frequency of Fig. 4 described devices and the inside of antenna element, as shown in fig. 7, radio frequency and antenna list
Member distinguishes recovered clock signal, synchronous triggering signal and data from each of which optical port, wherein, using the clock signal of recovery,
Data are stored in respective data buffer zone, for example, the data that will recover using the clock signal recovered from optical port 0 from optical port 0
The data buffer of optical port 0 is stored in, the data of optical port 1 are stored in using from the clock signal that optical port 1 is recovered by the data recovered from optical port 1
Buffer, optical port N data buffer etc. is stored in using from the clock signal that optical port N recovers by the data recovered from optical port N.Key light
Mouthful arbitration unit obtains the state of each optical port, and according to the state and optical port sequence number of each optical port, carries out main light port arbitration, from
An optical port is chosen in each optical port as main light port, for example, optical port x optical ports are in place, and alert without error code, and its sequence number is errorless
Highest priority in the optical port of code alarm, optical port x is now determined to be main critical point.After main light port x is selected, using clock jitter removing and
Module of living again carries out debounce and processing of living again to the clock recovered from main light port x, obtains being used to read data buffer zone and data
The work clock of processing.Using the work clock, the data that data buffer zone preserves are read, and by the data read feeding
Rf data processing module.Middle rf data processing module carries out data processing using the work clock and synchronous triggering signal,
Each antenna element carries out data transmit-receive using the work clock and synchronous triggering signal.That is, radio frequency and antenna list
Member recovered clock, synchronous triggering signal and data from more optical ports, wherein, clock and synchronous triggering signal are sent into main light port arbitration
Module, data put data buffer zone into using respective optical port recovered clock.Main light port arbitration unit is according to the state of each optical port
And sequence number, select a main light port.After main light port is selected, select main light port recovery clock and synchronous triggering signal to read
There are the data of data buffer zone and carry out follow-up data processing.The data and transmitting-receiving time for being sent into each antenna element use together
One work clock and frame timing, ensure the data syn-chronization that each antenna opening is sent.
The optical port data of radio frequency and antenna element enter field programmable gate array (Field-Programmable Gate
Array, FPGA) after, cache by data buffer area, handled using the clock of local recovery and timing (i.e. synchronous triggering signal)
And send data.Wherein, FPGA includes optical port, optical port data buffer, middle rf data processing module, antenna transmitting/reception
Module.
The BBU and RRU of the present invention annexation can also be one-to-many, many-one, multi-to-multi etc., and device realizes spirit
It is living, different structures can be used.
The BBU and RRU of the present invention annexation can be many-ones, such as corresponding 1 RRU of 2 BBU shown in Fig. 8
Application scenarios, BBU_1 optical port 0 to optical port N-M connects RRU optical port 0 to optical port N-M, BBU_2 light by optical fiber respectively
Mouth 0 to optical port M-1 passes through the optical port N-M+1 to optical port N that optical fiber connects RRU respectively.
The BBU and RRU of the present invention annexation can also be multi-to-multis, such as 2 BBU shown in Fig. 9 corresponding 3
RRU application scenarios, BBU_1 optical port 0 to optical port k connect RRU_1 optical port 0 to optical port k by optical fiber respectively, BBU_1's
Optical port k+1 to optical port 2k connects RRU_2 optical port 0 to optical port k by optical fiber respectively, BBU_1 optical port 2k+1 to 3k points of optical port
The optical port 0 that RRU_3 is connected by optical fiber corresponds to RRU_1, RRU_2 and RRU_3 to optical port k, i.e. BBU_1；Similarly, BBU_2
Optical port 0 connect RRU_1 optical port k+1 to optical port N by optical fiber respectively to optical port k, BBU_2 optical port k+1 to 2k points of optical port
RRU_2 optical port k+1 to optical port N is not connected by optical fiber, BBU_2 optical port 2k+1 to optical port 3k is connected by optical fiber respectively
RRU_3 optical port k+1 to optical port N, i.e. BBU_2 correspond to RRU_1, RRU_2 and RRU1_3.In other words, BBU_1 and BBU_2 pairs
Answer RRU_1, BBU_1 and BBU_2 to correspond to RRU_2, BBU_1 and BBU_2 and correspond to RRU_3.To realize the synchronization between multiple RRU,
It can be pre-configured with and require that RRU_1, RRU_2 and RRU_3 are synchronous with BBU_1 clocks, now RRU1_1 is from the light being connected with BBU_1
Mouth 0 arbitrates out main light port into optical port k, and using the clock recovered from the main light port, realization is synchronous with BBU_1 clock, together
Sample, RRU_2 and RRU_3 realize with BBU_1 clock synchronous in the same way, i.e., RRU_1, RRU_2 and RRU1_3 are equal
It is synchronous with BBU_1, so as to solve the clock synchronization issue between multiple RRU.
To sum up, embodiments of the invention have following technique effect：
The present invention solves massive mimo systems largely distributed Transmit Receive Unit (i.e. radio frequency and antenna element)
Stationary problem, synchronous method is realized simple, and synchronization accuracy is high, disclosure satisfy that the synchronous requirement of massive mimo systems, has
Effect suppresses the multi-path jamming of massive mimo systems, greatly improves channel estimation and channel equalization accuracy rate, effectively lifts nothing
The performance of line communication system.
Although the present invention is described in detail above, the invention is not restricted to this, those skilled in the art of the present technique
Various modifications can be carried out according to the principle of the present invention.Therefore, all modifications made according to the principle of the invention, all should be understood to
Fall into protection scope of the present invention.
Claims (14)
1. a kind of synchronous method of extensive multiple-input and multiple-output massive MIMO communication devices, including：
Main control unit utilizes external clock synchronisation source, generates system clock, and the system clock of generation is distributed into Base-Band Processing
Unit；
The baseband processing unit utilizes the system clock, generates local clock, and the local clock generated is passed to
Connected radio frequency and antenna element；
The radio frequency and antenna element choose a clock from the local clock from the baseband processing unit received, and
Using selected clock, realize synchronous with the baseband processing unit clock.
2. according to the method for claim 1, the main control unit utilizes external clock synchronisation source, system clock is generated, and
The step of system clock of generation is distributed into baseband processing unit includes：
The main control unit utilizes the external clock synchronisation source, its local clock is adjusted, when making the local after adjustment
Clock is synchronous with the external clock synchronisation source clock；
Using the local clock after the adjustment, system clock is generated, and via clock and data transmission unit by the generation
System clock be distributed to each baseband processing unit.
3. method according to claim 1 or 2, the external clock synchronisation source is global navigation satellite system GNSS or net
Network synchronous protocol 1588V2 clocks.
4. according to the method for claim 1, the local clock of the baseband processing unit generation passes through to being received
System clock carries out debounce and lives again what processing obtained.
5. according to the method for claim 4, the baseband processing unit carries out debounce and again to the system clock that is received
The local clock obtained after raw processing is the clock being adapted with the transmission rate of its optical port, and the baseband processing unit is via phase
Answer optical port that resulting local clock is passed into connected radio frequency and antenna element.
6. according to the method for claim 1, the radio frequency and antenna element are derived from the baseband processing unit from what is received
Local clock in choose a clock, and utilize selected clock, realize synchronous with the baseband processing unit clock
Step includes：
Recover to be derived from the Base-Band Processing in each optical port that the radio frequency and antenna element are connected from it with baseband processing unit
The local clock of unit；
The radio frequency and antenna element carry out optical port arbitration process, obtain one according to the state and sequence number of each optical port
Individual main light port；
The radio frequency and antenna element utilize the local clock recovered from the main light port, generate work clock, make the work
It is synchronous with the baseband processing unit clock to make clock.
7. according to the method for claim 6, the work clock of the radio frequency and antenna element generation is by from described
The local clock that main light port is recovered carries out debounce and lives again what processing obtained.
8. a kind of extensive multiple-input and multiple-output massive MIMO communication devices, including：
Main control unit, for utilizing external clock synchronisation source, system clock is generated, and the system clock of generation is distributed to base band
Processing unit；
Baseband processing unit, for utilizing the system clock, local clock is generated, and the local clock generated is passed to
Connected radio frequency and antenna element；
Radio frequency and antenna element, for choosing a clock from the local clock from the baseband processing unit received,
And selected clock is utilized, realize synchronous with the baseband processing unit clock.
9. device according to claim 8, the main control unit utilizes external clock synchronisation source, and its local clock is carried out
When adjusting, make the local clock after adjustment synchronous with the external clock synchronisation source clock, and utilizing the local after the adjustment
Clock, system clock is generated, the system clock of the generation is distributed to each Base-Band Processing via clock and data transmission unit
Unit.
10. device according to claim 8 or claim 9, the external clock synchronisation source be global navigation satellite system GNSS or
Network synchronization protocols 1588V2 clocks.
11. device according to claim 8, the local clock of the baseband processing unit generation passes through to being received
System clock carries out debounce and lives again what processing obtained.
12. device according to claim 11, the baseband processing unit system clock received is carried out debounce and
Obtained local clock after processing of living again is the clock being adapted with the transmission rate of its optical port, the baseband processing unit via
Resulting local clock is passed to connected radio frequency and antenna element by corresponding optical port.
13. device according to claim 8, the radio frequency and antenna element are connected each from it with baseband processing unit
Recover the local clock from the baseband processing unit in optical port, according to the state and sequence number of each optical port, carry out
Optical port arbitration process, a main light port is obtained, and utilizes the local clock recovered from the main light port, generate work clock,
Make the work clock synchronous with the baseband processing unit clock.
14. device according to claim 13, the work clock of radio frequency and the antenna element generation is by from institute
The local clock for stating main light port recovery carries out debounce and lives again what processing obtained.
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