CN103152816B - Distributed beam forming system and carrier synchronization method of transmitting antennas at source end of distributed beam forming system - Google Patents
Distributed beam forming system and carrier synchronization method of transmitting antennas at source end of distributed beam forming system Download PDFInfo
- Publication number
- CN103152816B CN103152816B CN201310085314.1A CN201310085314A CN103152816B CN 103152816 B CN103152816 B CN 103152816B CN 201310085314 A CN201310085314 A CN 201310085314A CN 103152816 B CN103152816 B CN 103152816B
- Authority
- CN
- China
- Prior art keywords
- base station
- base stations
- carrier
- synchronizing signal
- information
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
Abstract
The invention is applicable to the technical field of wireless communication and provides a distributed beam forming system and a carrier synchronization method of transmitting antennas at the source end of the distributed beam forming system. The transmitting antennas at the source end of the distributed beam forming system can realize accurate time slot control, can conduct frequency and phase estimation to received signals and can estimate phase shift information caused by channel time delay. The carrier synchronization method fully utilizes the broadcasting characteristics of wireless links and realizes the accurate synchronization of carrier frequency and phase of the distributed beam forming system through accurate time slot control and channel estimation. Compared with the traditional carrier synchronization method, the carrier synchronization method provided by the invention has the advantages that the synchronization overhead is greatly reduced, the time slot needed for synchronization is decreased to M from 2M-1 (wherein M is the number of source-end base stations) and the effective communication time of the system is increased.
Description
Technical field
The invention belongs to wireless communication technology field, particularly relate to the carrier synchronization method of a kind of distributed beams synthesis system and each transmitting antenna of source thereof.
Background technology
Distributed beams synthetic technology is a kind of wireless communication technology that can significantly improve system-power efficiency, it forms virtual antenna array the independently antenna being distributed in multiple community, and (wherein each antenna has respective crystal oscillator, and only know the local zone time of oneself), each day alignment object base station in antenna array sends identical signal, and these signals are relevant in object base station to be merged.Due to extensibility and the robustness of virtual antenna arrays, make distributed beams synthetic technology can obtain higher directional transmissions characteristic relative to traditional antenna battle array, larger received signal to noise ratio (Signal Noise Ratio can be obtained relative to a single aerial system, SNR) gain, its application relates to multi-cell cooperating network, multi-user wireless communication system, wireless sensor network (Wireless Sensor Network, WSN), OFDM (Orthogonal Frequency DivisionMultiplexing, OFDM)-multiple-input, multiple-output (Multiple-Input Multiple-Output, MIMO), 3G Long Term Evolution (Long Term Evolution, the various fields such as LTE).But due to the isomerism of source base station in network, namely each source base station has the independently position of local oscillator, source base station and the difference of channel transmission state, phase deviation is produced when making the signal of each source base station arrive object base station, destroy the merger and reorganization of signal, therefore, source synchronously must process transmission carrier wave.
Source carrier synchronization is the key technology in distributed beams synthesis, and whether carrier synchronization determines the quality of destination receptivity, and the fewer systematic function of synchronous holding time is better.Be applicable to distributed beams synthetic technology in prior art and carry out synchronous open-loop method to carrier wave mainly contain round carrier synchronization method based on time division duplex and two-way carrier synchronization method.A kind of front method is the upward signal received round-trip transmission in transmitting terminal base station, estimate that the phase information of each base station realizes with this synchronous, it is more that the shortcoming of this method mainly contains the time slot that (1) take, system for M root antenna composition needs 2M-1 time slot to realize all base station synchronizations, (2) this method can only realize the synchronous of carrier phase, the precise synchronization of carrier frequency can not be realized, (3) this method can not realize synchronous before antenna sends signal, could must start synchronous after receiving the upward signal from destination, increase the time delay of system, a kind of rear method utilizes the timesharing transmitted in both directions of synchronizing signal between base station to estimate phase of received signal, thus realize the carrier synchronization of base station, but the timeslot number that this method takies is more, the system for M root antenna composition needs 2M-2 time slot to realize all base station synchronizations.
Summary of the invention
First technical problem to be solved by this invention is the carrier synchronization method of each transmitting antenna of source providing a kind of distributed beams synthesis system, is intended to the phase place of the carrier wave realizing each transmitting antenna of source, Frequency Synchronization also reduces the time slot expense synchronously taken.
The present invention realizes like this, a kind of carrier synchronization method of each transmitting antenna of source of distributed beams synthesis system, described distributed beams synthesis system comprises source and destination, described source has multiple base station, each base station only covers adjacent base station, its both sides, described multiple base station comprises synchronizing signal and produces base station and intermediate base stations, described intermediate base stations is produce base station farthest, base station apart from described synchronizing signal, and described synchronizing signal produces between base station and intermediate base stations has two bars bang paths; Described carrier synchronization method comprises the steps:
Steps A, synchronizing signal produces base station at the first time slot initial synchronization signal and to synchronizing signal described in the adjacent base station broadcast in its both sides, and the adjacent base station of intermediate base stations both sides is estimated and the phase pushing figure of channel between itself and intermediate base stations respectively simultaneously;
Step B, described synchronizing signal is passed to intermediate base stations along described two bars bang path forwards respectively, transfer mode is that each time slot transmits a station, and in whole forward transmittance process, carrier information estimation is all carried out according to the synchronizing signal received in each base station, obtains the respective first carrier estimation information comprising carrier frequency and phase information;
Step C, the synchronizing signal that described two bars bang paths pass over superposes by intermediate base stations, then by superposition after synchronizing signal more respectively along the reverse transmission of described two bars bang path, adjacent base station, intermediate base stations both sides extracts the signal that the other side path passes over from the synchronizing signal after described superposition, and carry out carrier information estimation according to extracted signal, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information; Then the base station that intermediate base stations both sides are adjacent is passed to described synchronizing signal generation base station by reverse for the signal of extraction, all carry out carrier information estimation according to the extraction signal received with each base station on synchronizing signal bang path equidirectional in transmittance process, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information;
Step D, frequency in frequency in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronous by all base stations, the phase place in the phase place in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronously.
Second technical problem to be solved by this invention is to provide a kind of distributed beams synthesis system, and comprise source and destination, described source has multiple base station, and each base station only covers adjacent base station, its both sides;
Described multiple base station comprises synchronizing signal and produces base station and intermediate base stations, and described intermediate base stations is produce base station farthest, base station apart from described synchronizing signal, and described synchronizing signal produces between base station and intermediate base stations has two bars bang paths;
Described synchronizing signal produces base station and to be used at the first time slot initial synchronization signal and to synchronizing signal described in the adjacent base station broadcast in its both sides; The base station that described synchronizing signal produces both sides, base station respectively along described two bars bang paths by described synchronizing signal forward broadcast delivery to intermediate base stations, and transfer mode is each time slot transmits a station; And intermediate base stations is for superposing the synchronizing signal that described two bars bang paths pass over, then the synchronizing signal after superposition is passed to described synchronizing signal generation base station along described two bars bang paths are reverse more respectively;
A phase pushing figure evaluation unit is included in the adjacent base station of intermediate base stations and both sides thereof; Described phase pushing figure evaluation unit is used for when going on the air in described synchronizing signal generation base station, the phase pushing figure of the channel between the base station that estimation intermediate base stations is adjacent with its both sides;
A first carrier information estimation unit, the second carrier information evaluation unit and synchronizing information computing unit is included in each base station; Described first carrier information estimation unit is used in whole forward broadcast delivery process, carries out carrier information estimation according to the synchronizing signal received, and obtains the respective first carrier estimation information comprising carrier frequency and phase information; Described second carrier information evaluation unit for extracting the signal passed, and carries out carrier information estimation according to extracted signal, obtains respective the second carrier wave estimation information comprising carrier frequency and phase information; The synchronizing information computing unit of all base stations is used for the frequency in the frequency in respective first carrier estimation information and the second carrier wave estimation information to be added as the carrier frequency after synchronous, the phase place in the phase place in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronously.
The present invention takes full advantage of the broadcast characteristic of wireless link, the precise synchronization in the carrier frequency of distributed beams synthesis system and phase place is realized by accurately sequence control and channel estimation, compared with convention carrier synchronous method, present invention substantially reduces synchronization overhead, make synchronous required time slot be reduced to M (wherein M is source base station number) from 2M-1, thus add the efficient communication time of system.
Accompanying drawing explanation
Fig. 1 is that in distributed beams synthesis system provided by the invention, source has the signal during base station of odd number loop configuration to flow to schematic diagram;
Fig. 2 is that in distributed beams synthesis system provided by the invention, source has the signal during base station of even number loop configuration to flow to schematic diagram;
Fig. 3 is that in distributed beams synthesis system provided by the invention, source has the signal during base station of odd number linear structure to flow to schematic diagram;
Fig. 4 is that in distributed beams synthesis system provided by the invention, source has the signal during base station of even number linear structure to flow to schematic diagram;
Fig. 5 is the architecture principle figure of distributed beams synthesis system provided by the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In distributed beams synthesis system provided by the invention, each base station of source at least has an antenna, and each antenna provides and serves and have respective crystal oscillator in respective overlay area, each antenna uses respective local zone time Received signal strength and processing signals, accurate sequence control can be realized, and carry out the phase-shift information that frequency and phase place and channel time delay cause to received signal and estimate.
In the present invention, each base station of source only covers adjacent base station, its both sides, specifically can realize by arranging suitable signal transmission range, and comprise synchronizing signal in multiple base station and produce base station, it can be one (as loop configuration) that this synchronizing signal produces base station, also can be two (as linear structures), specifically see below content.
Carrier wave circulation method provided by the invention comprises the following steps:
Steps A, synchronizing signal produces base station at the first time slot initial synchronization signal and to synchronizing signal described in the adjacent base station broadcast in its both sides, and the adjacent base station of intermediate base stations both sides is estimated and the phase pushing figure of channel between itself and intermediate base stations respectively simultaneously.
Wherein, intermediate base stations is produce base station farthest, base station apart from described synchronizing signal, and when source has odd number base station, distance synchronous signal produces base station two base stations farthest, and wherein any one all can be used as intermediate base stations.Suppose to be numbered the base station in the system of M base station composition, be followed successively by BS
1, BS
2..., BS
m, a certain time slot, BS (is supposed in any base station
1) initial synchronization signal broadcast this synchronizing signal towards periphery, this synchronizing signal can only be received by its two adjacent base station.Like this, synchronizing signal produces between base station and intermediate base stations has two bars bang paths, synchronizing signal produce adjacent base station, the both sides of base station can along two bars bang paths by synchronizing signal forward broadcast delivery to intermediate base stations, in transmittance process, the synchronizing signal that next base station receives is the periodic extension of the synchronizing signal that a upper base station sends, be in particular in that phase place can postpone to some extent, frequency then remains unchanged substantially.
Because what this method utilized is the broadcast characteristic of wireless link, in synchronizing signal processing procedure, the synchronizing signal that there will be two base station broadcasts arrives the situation of intermediate base stations simultaneously.Processing method is now, these three base stations related to estimate and between oneself adjacent base station, due to the phase-shift information that channel time delay causes, broadcast out two base stations of synchronizing signal after the synchronizing signal receiving intermediate base stations broadcast passback, the synchronizing signal after process is separately deducted with this Received signal strength, synchronizing signal after this process is that the synchronizing signal phase place broadcasted away with previous time slot adds the signal of channel time delay phase place as new phase, and intermediate base stations does similar process.According to the parity of base station number, the base station number needing to carry out channel estimation is different, then the timeslot number that takies of channel estimation is also different.Base station number is greater than to the situation of 6, the time slot of initial broadcast synchronization signal can be utilized to carry out channel estimation, thus reduce the timeslot number shared by whole synchronizing process; Base station number is not more than to the situation of 6, in order to avoid interference then needs extra time slot to estimate for channel.When base station number is M, different according to concrete M value, the timeslot number of needs is respectively: (1) M > 6, needs M time slot to realize synchronous, (2) M≤6, is similar to and needs M+1 time slot realization synchronous.
Step B, described synchronizing signal is passed to intermediate base stations along described two bars bang path forwards respectively, transfer mode is that each time slot transmits a station, and in whole forward transmittance process, carrier information estimation is all carried out according to the synchronizing signal received in each base station, obtains the respective first carrier estimation information comprising carrier frequency and phase information.
As above, a certain time slot, any base station (supposing BS1) initial synchronization signal also broadcasts this synchronizing signal towards periphery, and this synchronizing signal can only be received by its two adjacent base station, and for estimating respective carrier frequency and phase information, now, this signal is ignored in other base stations, and at next time slot, these two base stations forward the synchronization signal broadcast that previous time slot receives, received by base station adjacent separately, and estimate for carrier information.This synchronizing signal will along path BS
1, BS
2..., BS
m/2with path BS
m, B
sM-1..., BS
m/2transmit simultaneously, until arrival intermediate base stations, the synchronizing signal received now is utilized along the base station on signaling path direction, wave frequency and phase information are carried in estimation, thus obtaining first carrier estimation information, the synchronizing signal received then directly is ignored in the base station on signaling path rightabout.
Step C, the synchronizing signal that described two bars bang paths pass over superposes by intermediate base stations, then by superposition after synchronizing signal more respectively along the reverse transmission of described two bars bang path, adjacent base station, intermediate base stations both sides extracts the signal that the other side path passes over from the synchronizing signal after described superposition, and carry out carrier information estimation according to extracted signal, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information; Then the base station that intermediate base stations both sides are adjacent is passed to described synchronizing signal generation base station by reverse for the signal of extraction, all carry out carrier information estimation according to the extraction signal received with each base station on synchronizing signal bang path equidirectional in transmittance process, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information.
After synchronization signal broadcast is passed to intermediate base stations, intermediate base stations goes out the summation broadcast delivery after the superposition from the synchronizing signal on two paths, this signal receives through the adjacent base station of intermediate base stations, after process, transmit along contrary path more simultaneously, until synchronizing signal broadcasts the base station passing back to initialization again, with similar before, the synchronizing signal received is utilized along the base station on signaling path direction, wave frequency and phase information are carried in estimation, thus obtain the second carrier wave estimation information, the synchronizing signal received then directly is ignored in base station on signaling path rightabout.
For the adjacent base station of intermediate base stations and both sides thereof, also need many channel estimation process, the odd even according to source base station number performs following step C1 or C2:
Step C1, when source base station number is odd number, for the base station that intermediate base stations both sides are adjacent, after synchronizing signal respectively after receiving the superposition that intermediate base stations sends over, the signal that synchronizing signal after described superposition receives as minuend, the upper time slot that is delayed 2 times of described phase pushing figures is done difference as subtrahend, then carry out carrier information estimation according to difference, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information.
Step C2, when source base station number is even number, for the base station that intermediate base stations both sides are adjacent, after synchronizing signal respectively after receiving the superposition that intermediate base stations sends over, using the synchronizing signal after described superposition as minuend, the signal that the upper time slot being delayed 2 times of described phase pushing figures receives does difference as subtrahend, then carrier information estimation is carried out according to difference, obtain respective the second carrier wave estimation information (why wanting the phase pushing figure of 2 times to be because be delayed by twice between two base stations of correspondence at signal) comprising carrier frequency and phase information.Then the base station that intermediate base stations both sides are adjacent separates different time-gap the signal after respective extraction process and broadcasts away, intermediate base stations carries out carrier information estimation to the signal that now receive two are extracted and obtains two phase estimation values and two frequence estimation values, utilize two phase estimation values to deduct corresponding described phase pushing figure respectively as its first and second carrier phase estimation information, frequence estimation value is the first and second carrier frequency estimation information.
Step D, frequency in frequency in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronous by all base stations, the phase place in the phase place in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronously.
At this moment, there is first carrier estimation information each base station, (base station of initialization synchronizing signal only has a class frequency and phase estimation information to the second carrier wave estimation information, frequency when another class frequency and phase information are initializations and phase place), and three of centre base stations also have phase estimation information, each base station is added two frequencies as the frequency after synchronously, phase place is added as the phase place after synchronously, thus realizes the carrier synchronization of all base stations in system.
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be described with three embodiments, four kinds of situations below.
Embodiment one: the odd number base station of source forms a closed-loop structure, synchronizing signal generation base station is any one base station in closed-loop structure, as shown in Figure 1.Steps A specifically comprises the following steps: steps A 1, at the first time slot, and the adjacent base station of intermediate base stations both sides, the phase pushing figure of the channel respectively between estimation and intermediate base stations.In Fig. 1, solid line represents the transmittance process of synchronizing signal between each base station, and the signal transmitted each time is all the periodic extension of previous time slot signal, and dotted line represents the process that channel is estimated, now needs a time slot TS
1for channel estimation (be base station respectively
estimation
with
between channel phase,
estimation
with
between channel phase), TS here
irepresent i-th time slot, BS
irepresent i-th base station, symbol "
" represent round, lower with.
Embodiment two: the even number base station of source forms a closed-loop structure, synchronizing signal generation base station is any one base station in closed-loop structure, as shown in Figure 2.Steps A specifically comprises the following steps: steps A 2, at the first time slot, and the adjacent base station of intermediate base stations both sides, the phase pushing figure of the channel respectively between estimation and intermediate base stations; At the second time slot, intermediate base stations estimates the phase pushing figure of the channel between itself and the adjacent base station of side; At last time slot of reverse broadcast delivery, intermediate base stations estimates the phase pushing figure of the channel between itself and the adjacent base station of opposite side.In Fig. 2, solid line represents the transmittance process of synchronizing signal between each base station, and the signal transmitted each time is all the periodic extension of previous time slot signal, and dotted line represents the process of channel estimating, now needs three time slots for channel estimation (at TS
1time slot, BS
m/2, BS
m/2+2estimate respective and BS
m/2+1between channel phase; At TS2 time slot, BS
m/2+1estimate itself and BS
m/2+2between channel phase; At TS
mtime slot, BS
m/2+1estimate itself and BS
m/2between channel phase).
Embodiment three: multiple base stations of source can form a linear structure, synchronizing signal produces the base station that base station is the two ends of linear structure, it can be now the odd number base station shown in Fig. 3, also can be the even number base station shown in Fig. 4, produce unlike the synchronizing signal at, two ends the synchronizing signal that base station produces with loop configuration can be the same or different.Steps A specifically comprises the following steps: steps A 3, at the first time slot, and the adjacent base station of intermediate base stations both sides, the phase pushing figure of the channel respectively between estimation and intermediate base stations.For the situation of Fig. 3, fine line represents the transmittance process of synchronizing signal between each base station, and the signal transmitted each time is all the periodic extension of previous time slot signal, and heavy line represents the process that channel is estimated, now needs a time slot TS
1for channel estimation (be base station respectively
estimation
with
between channel phase,
estimation
with
between channel phase), dotted line represents base station
with
separately two time slots think that surrounding broadcast transmits synchronizing signal, and when a base station broadcast signal, another base station is in the state of intercepting but is left intact, thus avoid signal and arrive intermediate base stations simultaneously.For the situation of Fig. 4, fine line represents the transmittance process of synchronizing signal between each base station, and the signal transmitted each time is all the periodic extension of previous time slot signal, and heavy line represents the process that channel is estimated, now needs a time slot TS
1for channel estimation (be base station respectively
estimation
with
between channel phase,
estimation
with
between channel phase), dotted line represents that intermediate base stations receives the synchronizing signal from adjacent two base stations respectively.
It should be noted that the situation for linear odd number, when base station linear distribution, BS
1, BS
minitial synchronization signal simultaneously, and space broadcast towards periphery, the frequency of these two synchronizing signals and phase place are not necessarily equal, and when base station annular spread, only have base station BS
1initial synchronization signal, and space broadcast towards periphery, namely the adjacent base station of intermediate base stations both sides carries out the broadcast delivery of synchronizing signal respectively at two different time-gaps.
To sum up, the present invention takes full advantage of the broadcast characteristic of wireless link, the precise synchronization in the carrier frequency of distributed beams synthesis system and phase place is realized by accurately sequence control and channel estimation, its spirit is that the propagation path of synchronizing signal is divided into two, then base station on two paths is recorded respectively the phase delay information of preserving the other side path, the mode transmitted between the base stations by synchronizing signal exchanges the local time information of base station, thus realizes the global synchronization of system carrier.After system carrier realizes global synchronization, each base station uses the phase place synchronously to deduct uplink signal phase place, this difference is as the phase place of downstream signal, and synchronous after frequency deduct uplink signal frequency, this difference is as the frequency (frequency after generally synchronous is similar to 2 times of upward signal frequency) of downstream signal, like this when downstream signal incoming terminal, always synchronous.Compared with convention carrier synchronous method, present invention substantially reduces synchronization overhead, make synchronous required time slot be reduced to M (wherein M is source base station number) from 2M-1, thus add the efficient communication time of system.
Fig. 5 shows the structural principle of distributed beams synthesis system provided by the invention, for convenience of description, illustrate only part related to the present invention.Fig. 5 is only described for the base station of source odd number annular array, should be appreciated that the base station of all the other even number annular array, and odd, even linearly aligned base station principle is identical.
With reference to Fig. 5, this distributed Beam synthesis system comprises source and destination, and source has multiple base station BS
1to BS
m, each base station only covers adjacent base station, its both sides.Multiple base station comprises synchronizing signal and produces base station BS
1and intermediate base stations, in the present invention, intermediate base stations is produce base station farthest, base station apart from described synchronizing signal, and synchronizing signal produces base station BS
1and have two bars bang paths between intermediate base stations, in the present invention, when source has odd number base station, distance synchronous signal produces base station BS
1have two base stations farthest, wherein any one all can be used as intermediate base stations, and with BS in Fig. 5
(M/2)+2as intermediate base stations.Synchronizing signal produces base station BS
1for at the first time slot initial synchronization signal and the base station broadcast synchronizing signal adjacent to its both sides; Synchronizing signal produces base station BS
1base station BS middle with it
(M/2)+2between there are two bars bang paths, synchronizing signal produce base station BS
1the adjacent base station BS in both sides
2and BS
mrespectively along two bars bang paths by synchronizing signal forward broadcast delivery to intermediate base stations BS
(M/2)+2, and transfer mode is each time slot transmits a station; And intermediate base stations BS
(M/2)+2for the synchronizing signal that two bars bang paths pass over being superposed, then the synchronizing signal after superposition is produced base station BS along the reverse synchronizing signal that is passed to of two bars bang paths more respectively
1.
At intermediate base stations BS
(M/2)+2and the base station BS that both sides are adjacent
(M/2)+1and BS
(M/2)+3in include a phase pushing figure evaluation unit; Phase pushing figure evaluation unit is used for when going on the air in synchronizing signal generation base station, estimation intermediate base stations BS
(M/2)+2and the base station BS that both sides are adjacent
(M/2)+1and BS
(M/2)+3between the phase pushing figure of channel.
A first carrier information estimation unit, the second carrier information evaluation unit and synchronizing information computing unit is included in each base station; The first carrier information estimation unit of each base station is used in whole forward broadcast delivery process, all carries out carrier information estimation according to the synchronizing signal received, and obtains the respective first carrier estimation information comprising carrier frequency and phase information; Second carrier information evaluation unit of each base station for extracting the signal passed, and carries out carrier information estimation according to extracted signal, obtains respective the second carrier wave estimation information comprising carrier frequency and phase information.The synchronizing information computing unit of all base stations is used for the frequency in the frequency in respective first carrier estimation information and the second carrier wave estimation information to be added as the carrier frequency after synchronous, the phase place in the phase place in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronously.
Further, multiple base stations of source can form a closed-loop structure, and synchronizing signal generation base station is any one base station in closed-loop structure.When the base station number of source is odd number, at the first time slot, intermediate base stations BS
(M/2)+2both sides adjacent base station BS
(M/2)+1and BS
(M/2)+3in phase pushing figure evaluation unit, respectively estimation with intermediate base stations BS
(M/2)+2between the phase pushing figure of channel.When the base station number of source is even number, at the first time slot, intermediate base stations BS
(M/2)+2both sides adjacent base station BS
(M/2)+1and BS
(M/2)+3in phase pushing figure evaluation unit, the phase pushing figure of channel respectively between estimation with intermediate base stations; At the second time slot, intermediate base stations BS
(M/2)+2in phase pushing figure evaluation unit estimate the adjacent base station BS of itself and side
(M/2)+1and BS
(M/2)+3between the phase pushing figure of channel; At last time slot of reverse broadcast delivery, the phase pushing figure evaluation unit in intermediate base stations estimates the phase pushing figure of the channel between itself and the adjacent base station of opposite side.
Further, multiple base stations of source can form a linear structure, and synchronizing signal produces the base station that base station is the two ends of linear structure; At the first time slot, intermediate base stations BS
(M/2)+2both sides adjacent base station BS
(M/2)+1and BS
(M/2)+3in phase pushing figure evaluation unit, the phase pushing figure of channel respectively between estimation with intermediate base stations.
Further, when the base station number of source is odd number, intermediate base stations BS
(M/2)+2both sides adjacent base station BS
(M/2)+1and BS
(M/2)+3the broadcast delivery of synchronizing signal is carried out respectively at two different time-gaps.
Further, when source base station number is odd number, after the synchronizing signal of the second carrier information evaluation unit in the base station that intermediate base stations both sides are adjacent respectively after receiving the superposition that intermediate base stations sends over, the signal that synchronizing signal after described superposition receives as minuend, the upper time slot that is delayed 2 times of described phase pushing figures is done difference as subtrahend, then carry out carrier information estimation according to difference, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information.When source base station number is even number, after the synchronizing signal of the second carrier information evaluation unit in the base station that intermediate base stations both sides are adjacent respectively after receiving the superposition that intermediate base stations sends over, the signal that synchronizing signal after described superposition receives as minuend, the upper time slot that is delayed 2 times of described phase pushing figures is done difference as subtrahend, then carry out carrier information estimation according to difference, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information; Then the base station that intermediate base stations both sides are adjacent separates different time-gap the signal after respective extraction process and broadcasts away, intermediate base stations carries out carrier information estimation to the signal that now receive two are extracted and obtains two phase estimation values and two frequence estimation values, utilize two phase estimation values to deduct corresponding described phase pushing figure respectively as its first and second carrier phase estimation information, frequence estimation value is the first and second carrier frequency estimation information.
The present invention is applicable to wireless communication technology field, particularly relates to the carrier synchronization of distributed time-division duplex system, multi-cell communication systems, cooperation communication system, distributed adhoc/mesh network etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the carrier synchronization method of each transmitting antenna of the source of a distributed beams synthesis system, it is characterized in that, described distributed beams synthesis system comprises source and destination, described source has multiple base station, each base station only covers adjacent base station, its both sides, described multiple base station comprises synchronizing signal and produces base station and intermediate base stations, described intermediate base stations is produce base station farthest, base station apart from described synchronizing signal, and described synchronizing signal produces between base station and intermediate base stations has two bars bang paths; Described carrier synchronization method comprises the steps:
Steps A, synchronizing signal produces base station at the first time slot initial synchronization signal and to synchronizing signal described in the adjacent base station broadcast in its both sides, and the adjacent base station of intermediate base stations both sides is estimated and the phase pushing figure of channel between itself and intermediate base stations respectively simultaneously;
Step B, described synchronizing signal is passed to intermediate base stations along described two bars bang path forwards respectively, transfer mode is that each time slot transmits a station, and in whole forward transmittance process, carrier information estimation is all carried out according to the synchronizing signal received in each base station, obtains the respective first carrier estimation information comprising carrier frequency and phase information;
Step C, the synchronizing signal that described two bars bang paths pass over superposes by intermediate base stations, then by superposition after synchronizing signal more respectively along the reverse transmission of described two bars bang path, adjacent base station, intermediate base stations both sides extracts the signal that the other side path passes over from the synchronizing signal after described superposition, and carry out carrier information estimation according to extracted signal, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information; Then the base station that intermediate base stations both sides are adjacent is passed to described synchronizing signal generation base station by reverse for the signal of extraction, all carry out carrier information estimation according to the extraction signal received with each base station on synchronizing signal bang path equidirectional in transmittance process, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information;
Step D, frequency in frequency in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronous by all base stations, the phase place in the phase place in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronously.
2. carrier synchronization method as claimed in claim 1, it is characterized in that, multiple base stations of described source can form a closed-loop structure, and described synchronizing signal generation base station is any one base station in closed-loop structure;
When the base station number of source is odd number, steps A specifically comprises the following steps: steps A 1, and at the first time slot, the adjacent base station of intermediate base stations both sides estimates the phase pushing figure of the channel between itself and intermediate base stations respectively;
When the base station number of source is even number, steps A specifically comprises the following steps: steps A 2, and at the first time slot, the adjacent base station of intermediate base stations both sides estimates the phase pushing figure of the channel between itself and intermediate base stations respectively; At the second time slot, intermediate base stations estimates the phase pushing figure of the channel between itself and the adjacent base station of side; At last time slot of described reverse broadcast delivery, intermediate base stations estimates the phase pushing figure of the channel between itself and the adjacent base station of opposite side.
3. carrier synchronization method as claimed in claim 1, it is characterized in that, multiple base stations of described source can form a linear structure, and described synchronizing signal produces the base station that base station is the two ends of linear structure;
Steps A specifically comprises the following steps: steps A 3, and at the first time slot, the adjacent base station of intermediate base stations both sides estimates the phase pushing figure of the channel between itself and intermediate base stations respectively.
4. carrier synchronization method as claimed in claim 3, it is characterized in that, when the base station number of source is odd number, the adjacent base station of intermediate base stations both sides carries out the broadcast delivery of synchronizing signal respectively at two different time-gaps.
5. carrier synchronization method as claimed in claim 1, it is characterized in that, described step C comprises the steps C1 or C2:
Step C1, when source base station number is odd number, for the base station that intermediate base stations both sides are adjacent, after synchronizing signal respectively after receiving the superposition that intermediate base stations sends over, the signal that synchronizing signal after described superposition receives as minuend, the upper time slot that is delayed 2 times of described phase pushing figures is done difference as subtrahend, then carry out carrier information estimation according to difference, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information;
Step C2, when source base station number is even number, for the base station that intermediate base stations both sides are adjacent, after synchronizing signal respectively after receiving the superposition that intermediate base stations sends over, the signal that synchronizing signal after described superposition receives as minuend, the upper time slot that is delayed 2 times of described phase pushing figures is done difference as subtrahend, then carry out carrier information estimation according to difference, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information; Then the base station that intermediate base stations both sides are adjacent separates different time-gap the signal after respective extraction process and broadcasts away, intermediate base stations carries out carrier information estimation to the signal that now receive two are extracted and obtains two phase estimation values and two frequence estimation values, utilize two phase estimation values to deduct corresponding described phase pushing figure respectively as its first and second carrier phase estimation information, frequence estimation value is the first and second carrier frequency estimation information.
6. a distributed beams synthesis system, comprises source and destination, and described source has multiple base station, and each base station only covers adjacent base station, its both sides; It is characterized in that:
Described multiple base station comprises synchronizing signal and produces base station and intermediate base stations, and described intermediate base stations is produce base station farthest, base station apart from described synchronizing signal, and described synchronizing signal produces between base station and intermediate base stations has two bars bang paths;
Described synchronizing signal produces base station and to be used at the first time slot initial synchronization signal and to synchronizing signal described in the adjacent base station broadcast in its both sides; The base station that described synchronizing signal produces both sides, base station respectively along described two bars bang paths by described synchronizing signal forward broadcast delivery to intermediate base stations, and transfer mode is each time slot transmits a station; And intermediate base stations is for superposing the synchronizing signal that described two bars bang paths pass over, then the synchronizing signal after superposition is passed to described synchronizing signal generation base station along described two bars bang paths are reverse more respectively;
A phase pushing figure evaluation unit is included in the adjacent base station of intermediate base stations and both sides thereof; Described phase pushing figure evaluation unit is used for when going on the air in described synchronizing signal generation base station, the phase pushing figure of the channel between the base station that estimation intermediate base stations is adjacent with its both sides;
A first carrier information estimation unit, the second carrier information evaluation unit and synchronizing information computing unit is included in each base station; Described first carrier information estimation unit is used in whole forward broadcast delivery process, carries out carrier information estimation according to the synchronizing signal received, and obtains the respective first carrier estimation information comprising carrier frequency and phase information; Described second carrier information evaluation unit for extracting the signal passed, and carries out carrier information estimation according to extracted signal, obtains respective the second carrier wave estimation information comprising carrier frequency and phase information; The synchronizing information computing unit of all base stations is used for the frequency in the frequency in respective first carrier estimation information and the second carrier wave estimation information to be added as the carrier frequency after synchronous, the phase place in the phase place in described first carrier estimation information and the second carrier wave estimation information is added as the carrier frequency after synchronously.
7. distributed beams synthesis system as claimed in claim 6, it is characterized in that, multiple base stations of described source can form a closed-loop structure, and described synchronizing signal generation base station is any one base station in closed-loop structure;
When the base station number of source is odd number, at the first time slot, the phase pushing figure evaluation unit in the adjacent base station of intermediate base stations both sides estimates the phase pushing figure of the channel between intermediate base stations respectively;
When the base station number of source is even number, at the first time slot, the phase pushing figure evaluation unit in the adjacent base station of intermediate base stations both sides estimates the phase pushing figure of the channel between intermediate base stations respectively; At the second time slot, the phase pushing figure evaluation unit in intermediate base stations estimates the phase pushing figure of the channel between itself and the adjacent base station of side; At last time slot of described reverse broadcast delivery, the phase pushing figure evaluation unit in intermediate base stations estimates the phase pushing figure of the channel between itself and the adjacent base station of opposite side.
8. distributed beams synthesis system as claimed in claim 6, it is characterized in that, multiple base stations of described source can form a linear structure, and described synchronizing signal produces the base station that base station is the two ends of linear structure;
At the first time slot, the phase pushing figure evaluation unit in the adjacent base station of intermediate base stations both sides estimates the phase pushing figure of the channel between intermediate base stations respectively.
9. distributed beams synthesis system as claimed in claim 8, it is characterized in that, when the base station number of source is odd number, the adjacent base station of intermediate base stations both sides carries out the broadcast delivery of synchronizing signal respectively at two different time-gaps.
10. distributed beams synthesis system as claimed in claim 6, it is characterized in that, when source base station number is odd number, after the synchronizing signal of the second carrier information evaluation unit in the base station that intermediate base stations both sides are adjacent respectively after receiving the superposition that intermediate base stations sends over, the signal that synchronizing signal after described superposition receives as minuend, the upper time slot that is delayed 2 times of described phase pushing figures is done difference as subtrahend, then carry out carrier information estimation according to difference, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information;
When source base station number is even number, after the synchronizing signal of the second carrier information evaluation unit in the base station that intermediate base stations both sides are adjacent respectively after receiving the superposition that intermediate base stations sends over, the signal that synchronizing signal after described superposition receives as minuend, the upper time slot that is delayed 2 times of described phase pushing figures is done difference as subtrahend, then carry out carrier information estimation according to difference, obtain respective the second carrier wave estimation information comprising carrier frequency and phase information; Then the base station that intermediate base stations both sides are adjacent separates different time-gap the signal after respective extraction process and broadcasts away, intermediate base stations carries out carrier information estimation to the signal that now receive two are extracted and obtains two phase estimation values and two frequence estimation values, utilize two phase estimation values to deduct corresponding described phase pushing figure respectively as its first and second carrier phase estimation information, frequence estimation value is the first and second carrier frequency estimation information.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310085314.1A CN103152816B (en) | 2013-03-18 | 2013-03-18 | Distributed beam forming system and carrier synchronization method of transmitting antennas at source end of distributed beam forming system |
| PCT/CN2013/086813 WO2014146435A1 (en) | 2013-03-18 | 2013-11-10 | Distributed beamforming system and carrier synchronization method of transmitting antennas at source end thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310085314.1A CN103152816B (en) | 2013-03-18 | 2013-03-18 | Distributed beam forming system and carrier synchronization method of transmitting antennas at source end of distributed beam forming system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103152816A CN103152816A (en) | 2013-06-12 |
| CN103152816B true CN103152816B (en) | 2015-07-15 |
Family
ID=48550616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310085314.1A Expired - Fee Related CN103152816B (en) | 2013-03-18 | 2013-03-18 | Distributed beam forming system and carrier synchronization method of transmitting antennas at source end of distributed beam forming system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103152816B (en) |
| WO (1) | WO2014146435A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152816B (en) * | 2013-03-18 | 2015-07-15 | 深圳大学 | Distributed beam forming system and carrier synchronization method of transmitting antennas at source end of distributed beam forming system |
| CN103634895B (en) * | 2013-11-13 | 2016-08-17 | 深圳大学 | Fast beam synthesis system and the carrier synchronization method of each transmission antenna of source thereof |
| US10932211B2 (en) | 2016-08-11 | 2021-02-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for wireless device synchronization in a beam-based communication system |
| WO2018033606A1 (en) | 2016-08-19 | 2018-02-22 | Telefonaktiebolaget Lm Ericsson (Publ) | Distinguishing reference signals in a beam-based communication system |
| CN110518957B (en) * | 2019-07-30 | 2020-11-06 | 北京大学 | Bypass network guiding method in open wireless channel |
| CN113207168B (en) * | 2021-07-06 | 2021-09-24 | 军事科学院系统工程研究院网络信息研究所 | Agile access method and system based on directional beam forming |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304399A (en) * | 2008-04-17 | 2008-11-12 | 北京邮电大学 | Method and equipment for multi-frequency deviation carrier synchronization and channel evaluation |
| CN101388701A (en) * | 2007-09-10 | 2009-03-18 | 大唐移动通信设备有限公司 | Customer data receiving/transmitting method, apparatus and distributed intelligent antenna system |
| CN101447962A (en) * | 2007-11-27 | 2009-06-03 | 华为技术有限公司 | Method, device and synchronous system for sending and receiving synchronous information |
| CN101599817A (en) * | 2008-06-03 | 2009-12-09 | 中兴通讯股份有限公司 | A kind of method that improves performance of synchronous non-self-adapting mixed automatic retransmission |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101626269A (en) * | 2009-08-17 | 2010-01-13 | 中兴通讯股份有限公司 | Downlink synchronous emission control method and system |
| EP2369880B1 (en) * | 2010-03-23 | 2013-08-21 | Mitsubishi Electric Corporation | Method for synchronizing nodes of a mesh wireless network |
| CN102821455B (en) * | 2012-07-18 | 2015-11-11 | 北京无线电计量测试研究所 | For microwave duplex transmission device and the method for synchronizing time of many base station time synchronisms |
| CN103152816B (en) * | 2013-03-18 | 2015-07-15 | 深圳大学 | Distributed beam forming system and carrier synchronization method of transmitting antennas at source end of distributed beam forming system |
-
2013
- 2013-03-18 CN CN201310085314.1A patent/CN103152816B/en not_active Expired - Fee Related
- 2013-11-10 WO PCT/CN2013/086813 patent/WO2014146435A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388701A (en) * | 2007-09-10 | 2009-03-18 | 大唐移动通信设备有限公司 | Customer data receiving/transmitting method, apparatus and distributed intelligent antenna system |
| CN101447962A (en) * | 2007-11-27 | 2009-06-03 | 华为技术有限公司 | Method, device and synchronous system for sending and receiving synchronous information |
| CN101304399A (en) * | 2008-04-17 | 2008-11-12 | 北京邮电大学 | Method and equipment for multi-frequency deviation carrier synchronization and channel evaluation |
| CN101599817A (en) * | 2008-06-03 | 2009-12-09 | 中兴通讯股份有限公司 | A kind of method that improves performance of synchronous non-self-adapting mixed automatic retransmission |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103152816A (en) | 2013-06-12 |
| WO2014146435A1 (en) | 2014-09-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103152816B (en) | Distributed beam forming system and carrier synchronization method of transmitting antennas at source end of distributed beam forming system | |
| CN102165830B (en) | Method of transmitting reference signals for cooperative wireless communication system and method of allocating radio resources for relay-based wireless communication system | |
| TW202008815A (en) | Method and apparatus of wireless communication in WLAN | |
| CN105144612A (en) | Method and apparatus for configuring QCL between antenna ports for massive MIMO in a wireless communication system | |
| CN102710309B (en) | Be applicable to the synchronizing signal launching technique of large-scale antenna array | |
| JP6949136B2 (en) | A method in which a terminal communicates by CDD (cyclic delay diversity) using multiple antennas in a wireless communication system and a device for that purpose. | |
| WO2015070679A1 (en) | System for quickly synthesizing wave beams and carrier synchronization method for various sending antennas at source end thereof | |
| CN103139913B (en) | A kind of method of collocating uplink sounding reference signal and LTE heterogeneous network | |
| CN101626269A (en) | Downlink synchronous emission control method and system | |
| US8139557B2 (en) | Wireless base station apparatus and system to avoid preamble interference | |
| CN103650419A (en) | Mobile communications network, mobile communications device, relay node and method | |
| CN103517398A (en) | Device-to-device communication method and terminal | |
| CN103475614A (en) | Method and device for frequency offset estimation and compensation | |
| US8937938B2 (en) | Method and apparatus for acquiring uplink and downlink synchronization between a plurality of base stations and a terminal in a cooperative communication network | |
| CN102158457B (en) | Method for compensating frequency offset of multi-point multi-user OFDM (Orthogonal Frequency Division Multiplexing) system | |
| CN103825681B (en) | Communication means and receiving device | |
| CN106160814B (en) | A kind of multi-base station cooperative downlink transmission method based on interference alignment techniques | |
| CN102307163A (en) | Channel estimating method based on circulation orthogonal sequence in multi-relay cooperative communication system | |
| CN102547967B (en) | Method, system and user device to realize synchronization through time division duplex long-term evolution system | |
| CN102523619B (en) | Distributed coherent cooperation method in long distance wireless communication system | |
| CN106604325B (en) | The method of base station and its execution in millimeter-wave communication system | |
| CN106534035A (en) | Timing synchronization method in low-orbit satellite communication system | |
| KR102088026B1 (en) | Downlink signal transmission / reception method of terminal and base station in wireless communication system and apparatus supporting same | |
| CN101615940B (en) | Antenna recognition method for multiple- antenna system | |
| CN107528616B (en) | Large-scale MIMO transmission method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150715 Termination date: 20160318 |