CN103138910B - Communication means in communication means in base station, base station, movement station and movement station - Google Patents
Communication means in communication means in base station, base station, movement station and movement station Download PDFInfo
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- CN103138910B CN103138910B CN201310081879.2A CN201310081879A CN103138910B CN 103138910 B CN103138910 B CN 103138910B CN 201310081879 A CN201310081879 A CN 201310081879A CN 103138910 B CN103138910 B CN 103138910B
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Abstract
Communication means in communication means in a kind of base station of present invention offer, base station, movement station and movement station.Base station, when being communicated with movement station by MIMO ofdm communication, in the case that the communication environment of movement station is good, is multiple-input and multiple-output using multiple data stream transmission（MIMO）Communication mode, and in the case that the communication environment of movement station is bad, be single input and multi-output using single data stream transmission（SIMO）Communication mode is sending data and pilot signal.In this MIMO ofdm communication, base station is controlled as follows：Make the single data stream for the pilot signal of channel estimation with abutting subdistrict in the single data stream transmission of regulation cell misaligned in frequency direction and/or time-axis direction for the pilot signal of channel estimation when transmitting.
Description
The application is the application for a patent for invention of original bill Application No. No.200680052160.4（International application no：PCT/
JP2006/305488, the applying date：On March 20th, 2006, denomination of invention：Base station and its MIMO-OFDM communication means）Division
Application.
Technical field
The present invention relates to base station and its MIMO-OFDM communication means, more particularly to using multiple OFDM dispensing devices, adopt
Use multiple-input and multiple-output（Multiple Input Multiple Output：MIMO）Pilot tone is believed by communication mode from multiple antennas
Number it is sent collectively to base station and its MIMO-OFDM communication means of movement station with data.
Background technology
In many digital mobile communication systems, in order to compensate the distortion of the data signal in fading channel and from sending side
Pilot signal multiplexing to be transmitted in data signal.Receive the pilot signal sending from sending side in receiving side, should
Receive pilot signal and compare, with known pilot signal, the estimation relatively to carry out channel distortion（Channel estimation）, estimated according to this channel
Evaluation implements channel compensation to received data signal.The multiplexing method of data signal and pilot signal has various, below says
Bright OFDM（Orthogonal Frequency Division Multiplex, OFDM）The situation of mode.
Figure 11 is the structure chart of the dispensing device in ofdm communication system, and data modulation unit 1 will send data（User data
And control data）Carry out such as QPSK data modulation, and be converted into the complex baseband signal with in-phase component and quadrature component（Code
Unit）.The pilot tone time division multiplex of multiple code elements is data symbols by time division multiplex portion 2.Input data is turned by serial parallel converter section 3
Change the parallel data of M code element into, and export M subcarrier sampling S0～SM-1.IFFT（Inverse Fast Fourier
Transform, fast fourier inverse transformation）The subcarrier sampling S to parallel input for the portion 40～SM-1Implement IFFT（Fourier is inverse
Conversion）Process and to be synthesized, as discrete-time signal（Ofdm signal）To export.Between protection interval insertion section 5 will be protected
Every be inserted into from IFFT Department input M code element ofdm signal in, sending part（TX）The OFDM being inserted with protection interval is believed by 6
Number carry out DA conversion, then the frequency of ofdm signal is become radio band from baseband-converted, carry out High frequency amplification and from 7, antenna
Send.
Figure 12 is serial parallel conversion specification figure, and the front being shown in the transmission data of 1 frame carries out the time-division to public guide frequency P
The example of multiplexing.It is assumed that every 1 frame public guide frequency is, for example, 4 × M code element（=4OFDM code element）, and to send data be 28 × M code
Unit（=28OFDM code element）, then from serial parallel converter section 3 export pilot tone M code element as parallel data until initial 4 times,
Export the M code element 28 times sending data as parallel data later.As a result, can during 1 frame in pilot tone time division multiplex is
All subcarriers simultaneously transmit 4 times, can carry out channel compensation using this pilot tone for each subcarrier estimation channel in receiving side
（Fading compensation）.In addition, 1 OFDM symbol is made up of M code element.
Figure 13 is protection interval insertion explanatory diagram.Protection interval insertion refers to, will sample with M subcarrier（=1OFDM
Code element）When corresponding IFFT output signal is as 1 unit, tail portion is copied to its beginning portion.By inserting protection interval
GI, can eliminate the impact of the intersymbol interference that multipath causes.
Figure 14 is the structure chart of OFDM transmission/receptidevice device.The signal being exported from transmission antenna 7 is through fading channel（Propagate road
Footpath）Received by the reception antenna 8 of reception device, receiving circuit（Rx）The RF signal being received from antenna is converted into base band letter by 9
Number, and this baseband signal AD conversion is become digital signal to export.FFT Timing synchronization circuitry 10 exports according to from receiving circuit 9
Time-domain signal detection FFT timing, code element cut-out portion 11 removes GI and simultaneously cuts out OFDM symbol to export according to this FFT timing
FFT portion 12.FFT portion 12 carries out FFT process to each OFDM symbol being cut out, and is converted into the subcarrier sampling S of frequency domain0'～
SM-1’.Channel estimation circuit 13 passes through to calculate the correlation of the pilot frequency code element receiving at certain intervals and known pilot frequency mode, comes
Carry out the channel estimation of each subcarrier, channel compensation circuit 14 carrys out the channel variation of offset data code element using channel estimation value.
Processed by above, be allocated to the demodulation of the transmission data of each subcarrier.After, although not shown, but demodulated
Subcarrier signal be converted into serial data after be decoded.
Be more than by pilot signal the closeer configuration of frequency direction situation, and the transmission efficiency from data signal, to letter
From the viewpoint of followability that road changes etc., it is known that pilot signal is relatively dredged being distributed of configuration in time or frequency direction
's.Figure 15 is in specific subcarrier, and in the range of adjacent 4OFDM code element, pilot signal P is embedded in data signal
It is distributed example in DT.It is carried out as follows the channel estimation employing the pilot signal being distributed.
Reception device passes through the reception obtaining after the fft pilot signal is multiplied by the complex conjugate of known pilot signal, meter
Calculate the channel estimation value of the subcarrier being embedded with this reception pilot signal.Then, by by this channel estimation value adjacent many
Carry out time average, to a certain extent suppression noise and interference components between individual code element.Afterwards, using being embedded with this pilot signal
Subcarrier channel estimation value, the channel estimation value being not embedded into the subcarrier of pilot signal is carried out interpolation in frequency direction
Interpolation or extrapolation interpolation are obtaining.Same it is directed to the OFDM symbol being not embedded into pilot signal, using being embedded with pilot signal
Channel estimation value in OFDM symbol enters row interpolation to obtain in time orientation.It is assumed that for example existing in above-mentioned interpolation processing
It is embedded between the subcarrier of pilot signal or the OFDM symbol of interpolation use, channel distortion linearity variations, thus linearly inserted
Value.However, strictly speaking the channel distortion of reality is not linearity variations, but in time orientation because the high speed of movement station is moved
Dynamic, and in frequency direction because the delay of multipath channel disperses and complicated variation, thus the channel estimation value after interpolation processing produces
Raw error.
Therefore, in being distributed example, the insertion interval of pilot signal is wider, and the transmission efficiency of data signal more carries
Height, the drastically variation of the channel that channel estimation is difficult to follow the high-speed mobile etc. due to movement station and produces, thus lead to receive
Deterioration in characteristics.On the other hand, the insertion interval of pilot signal is narrower, and the transmission efficiency of data signal is got over and declined, channel estimation
Easily follow the drastically variation of channel, thus be difficult to the deterioration occurring to receive characteristic.Therefore, the configuration of pilot signal is necessary to examine
Consider to be designed with the geographical environment of digital mobile communication system and the translational speed of the movement station envisioned.
Here, it is contemplated that being located at cell A, B, the movement station MS near the border of C in the multi-cell environment shown in Figure 16
Base station BS with cell AAThe situation being communicated.Movement station MS is receiving the base station BS from cell AADownlink letter
Number SAWhen, also receive the base station BS from abutting subdistrict B, CB、BSCInterference signal IB、IC.
In the case of 1 cell repetition system, suppress these interference signals in the following manner.That is, dispensing device is using expansion
Show code（Channel code）It is extended, or by repeating（Repetition）The data message of 1 code element is copied to multiple codes
In unit, it is multiplied by the intrinsic scrambler of cell afterwards to send.Reception device will be multiplied by reception letter with dispensing device identical scrambler
Number afterwards, carry out the despreading based on extended code or homophase additive operation, to be demodulated, thus suppressing to a certain extent to come
Interference signal from abutting subdistrict.
However, because pilot signal to be sent with the power higher than data signal, even if thus carried out above-mentioned process, give
The impact that abutting subdistrict is brought remains on very big.Particularly, in inter-base station synchronizing system, each cell A, B, C as shown in figure 17
Pilot signal PA、PB、PCConfiguration be public.Therefore, the pilot signal of each cell always interferes, and makes channel estimation
Precision deteriorates.Even and if, in asynchronous system between base station, according to ratio to a certain degree in time, the leading of each cell
Frequency signal also interferes, and so that precision of channel estimation is deteriorated.
As the countermeasure avoiding the problems referred to above, if make pilot signal configuration misaligned in each cell.In Figure 18
In shown example, the pilot signal of 3 adjacent cells staggers in frequency direction and is configured to misaligned.In this case, no
The interval that the frequency direction of pilot signal in specific cell can be made is than n subcarrier（N=cell number -1）Little.Figure 18's
N=2 in example.
In MIMO（Multiple-Input Multiple-Output, multiple-input and multiple-output）In the case of multiplexing transmission,
Due to being necessary to obtain the channel estimation value of each transmission antenna, thus send orthogonal pilot signalses according to each transmission antenna.These
As the situation that the configuration of pilot signal is sent with single antenna, as long as misaligned in each cell.Figure 19 be each cell A,
Base station BS in B, CA、BSB、BSCCarry out the multi-cell environment explanatory diagram of MIMO multiplexing transmission, Tu20Shi using 4 antennas 1～4
Each cell A, B, the pilot signal configuration example of the antenna 1～4 of C.In this example embodiment, each cell A, B, 4 transmission antennas in C
Pilot signal PA0～PA3、PB0～PB3、PC0～PC3Stagger in frequency direction and be configured to mutually not weigh in 3 adjacent minizones
Close.
However, it is impossible to make the frequency of the pilot signal in any antenna in arbitrary cells in the pilot frequency configuration example of Figure 20
The interval in rate direction compares 11（=3 cell × 4 antennas -1）Subcarrier is little.Therefore, under the big situation of channel variation, using slotting
The precision of channel estimation deterioration of value.
There is such prior art, that is,：In the case of sending ofdm signal from multiple antennas, pilot signal is stoped to exist
Interference on propagation path（With reference to patent documentation 1）.In the prior art, send by specific subcarrier from an antenna
Pilot signal, does not export pilot frequency carrier wave from another antenna, and the pair load with the pilot frequency carrier wave same frequency of an antenna
Ripple is considered as spacing wave.However, the prior art does not prevent the interference of the pilot signal from other cells or other sectors.And
And, prior art can not carry out high precision while the interference preventing the pilot signal from other cells or other sectors
Channel estimation.
Patent documentation 1：Japanese Unexamined Patent Publication 2003-304216 publication
Content of the invention
According to more than, the purpose of the present invention be can prevent from movement station be not communication in other cells or other fan
Carry out the channel estimation of high precision while the pilot signal interference in area.
It is another object of the present invention to, in the case that movement station is present in cell boarder or sector borders, can fully subtract
Interference between little pilot signal, and can carry out following the channel estimation of channel variation drastically.
1MIMO-OFDM communication means
The present invention is a kind of MIMO-OFDM communication means, using multiple OFDM dispensing devices, using multiple-input and multiple-output
（MIMO）Pilot signal and data are sent collectively to movement station from multiple antennas by communication mode, and this communication means has：According to
The communication environment of movement station is MIMO communication mode using multiple data stream transmission or be single input using single data stream transmission
Multi output（Single Input Multiple Output：SIMO）The step to send data and pilot signal for the communication mode；
And by this pilot signal be configured to make to be used for when single data stream transmits in regulation cell channel estimation pilot signal and
It is used for the pilot signal of channel estimation when single data stream transmits in frequency direction and/or time-axis direction phase in abutting subdistrict
Mutually misaligned step.
The 1MIMO-OFDM communication means of the invention described above also has to be made when described single data stream transmits from regulation sky
The high-power step of the pilot signal that the power ratio of the pilot signal for channel estimation that line sends sends from other antennas.
The 1MIMO-OFDM communication means of the invention described above also has：Receive the pilot tone sending from base station in the mobile stations
Signal is measuring communication environment, and the step that will determine the data feedback of this communication environment to base station；And basis in a base station
This communication environment determines data to determine to be by the step that multiple data stream transmission is also by single data stream transmission.
The 1MIMO-OFDM communication means of the invention described above also has：Receive the pilot tone sending from base station in the mobile stations
Signal is measuring communication environment, and the step that will determine the data feedback of this communication environment to base station；And basis in a base station
This communication environment determines the step to control the data fluxion in multiple data stream transmission for the data.
2MIMO-OFDM communication means
The present invention is a kind of MIMO-OFDM communication means, and cell is carried out sectorization, uses multiple OFDM for each sector
Dispensing device, using multiple-input and multiple-output（MIMO）Pilot signal and data are sent collectively to move by communication mode from multiple antennas
Dynamic station, this communication means has：According to the communication environment of the movement station in sector, it is MIMO communication party using multiple data stream transmission
Formula or be single input and multi-output using single data stream transmission（SIMO）Communication mode is sending the step of data and pilot signal
Suddenly；And this pilot signal is configured to make be used in regulation sector the pilot signal of channel estimation when single data stream transmits
With in adjacent sector when single data stream transmits be used for channel estimation pilot signal in frequency direction and/or time-axis direction
Mutually misaligned step.
The 2MIMO-OFDM communication means of the invention described above also has to be made when described single data stream transmits from regulation sky
The high-power step of the pilot signal that the power ratio of the pilot signal for channel estimation that line sends sends from other antennas.
The 2MIMO-OFDM communication means of the invention described above also has the sector measuring from each sector by movement station
The receiving power of antenna and according to the poor decision of this receiving power between adjacent sector be by multiple data stream transmission still enter
The streamed step of row forms data.
The 2MIMO-OFDM communication means of the invention described above also has in the case of carrying out described multiple data stream transmission,
The step that communication environment according to the movement station in sector controls the data fluxion in multiple data stream transmission.
Base station
The base station of the present invention has execution the above-mentioned 1st, the structure of 2MIMO-OFDM communication means.That is, the 1st of the present invention
Base station has：Communication mode determination section, its according to the communication environment of movement station, decision be using multiple data stream transmission be MIMO lead to
Letter mode is communicated, or is single input and multi-output using single data stream transmission（SIMO）Communication mode is communicated；And
Pilot frequency locations control unit, the position control of this pilot signal is become to make to be used for letter when single data stream transmits in regulation cell by it
Road estimate pilot signal and in abutting subdistrict when single data stream transmit for channel estimation pilot signal in frequency side
To and/or time-axis direction mutually misaligned.
2nd base station of the present invention has the structure executing above-mentioned 2MIMO-OFDM communication means.That is, the 2nd base station has：
Communication mode determination section, its according to the communication environment of the movement station in sector, decision be using multiple data stream transmission be MIMO lead to
Letter mode is communicated, or is single input and multi-output using single data stream transmission（SIMO）Communication mode is communicated；And
Pilot frequency locations control unit, the position control of this pilot signal is become to make to be used for letter when single data stream transmits in regulation sector by it
Road estimate pilot signal and in adjacent sector when single data stream transmit for channel estimation pilot signal in frequency side
To and/or time-axis direction mutually misaligned.
The present invention provides the communication means in a kind of base station, and this base station has multiple antennas, and is believed pilot tone using OFDM
Number with data send jointly to movement station, this communication means is characterised by, has steps of：
Decision is to be MIMO communication mode using multiple data stream transmission or is that how defeated single input is using single data stream transmission
Go out communication mode and send data and pilot signal to movement station；
The pilot signal sending when single data stream transmits according to base station in regulation cell with to be adjacent to this regulation little
The pilot signal that in the abutting subdistrict in area, other base stations different with described base station send when single data stream transmits is for each
Antenna mode mutually misaligned in a frequency direction configuring this pilot signal,
Sending described data, pilot signal and expression to described movement station is to be transmitted by described multiple data stream or described list
Any control information being transmitted in data stream.
The present invention provides the communication means in a kind of base station, and this base station has multiple antennas, and cell is carried out sectorization,
Using OFDM, pilot signal and data are sent jointly to movement station for each sector, this communication means is characterised by having
Following steps：
Decision is to be MIMO communication mode using multiple data stream transmission or is that how defeated single input is using single data stream transmission
Go out communication mode and send data and pilot signal to the movement station in sector；
The pilot signal that sends when single data stream transmits according to base station in regulation sector and be adjacent to this regulation fan
The pilot signal that in the adjacent sector in area, this base station sends when single data stream transmits is for each antenna phase in a frequency direction
Mutually misaligned mode to be configuring this pilot signal,
Sending described data, pilot signal and expression to described movement station is to be transmitted by described multiple data stream or described list
Any control information being transmitted in data stream.
The present invention provides a kind of base station, and it has multiple antennas, and is sent pilot signal together with data using OFDM
To movement station, this base station is characterised by having：
Communication mode determination section, it determines it is to be that MIMO communication mode carries out communicating or adopting using multiple data stream transmission
It is that single input and multi-output communication mode is communicated with single data stream transmission；
Pilot frequency locations control unit, the position control of this pilot signal is become to make in regulation cell this base station in forms data by it
The pilot signal sending during streaming is spread in forms data with other base stations in the abutting subdistrict being adjacent to described regulation cell
The pilot signal sending when sending is mutually misaligned in frequency direction and/or time-axis direction for each antenna；And
Sending part, sending described data, pilot signal and expression to described movement station is to be transmitted by described multiple data stream
Or any control information being transmitted in the transmission of described single data stream.
The present invention provides a kind of base station, and it has multiple antennas, and cell is carried out sectorization, uses for each sector
Pilot signal and data are sent jointly to movement station by OFDM, and this base station is characterised by having：
Communication mode determination section, it determines it is to be that MIMO communication mode carries out communicating or adopting using multiple data stream transmission
It is that single input and multi-output communication mode is communicated with single data stream transmission；
Pilot frequency locations control unit, the position control of this pilot signal is become to make in regulation sector this base station in forms data by it
The pilot signal that sends during streaming and in the adjacent sector being adjacent to described regulation sector this base station transmit in single data stream
When the pilot signal that sends mutually misaligned in frequency direction and/or time-axis direction for each antenna；And
Sending part, sending described data, pilot signal and expression to described movement station is to be transmitted by described multiple data stream
Or any control information being transmitted in the transmission of described single data stream.
The present invention provides the communication means in a kind of movement station, and this movement station receives the base station utilization with multiple antennas
The pilot signal that OFDM is sent together with data, this communication means is characterised by, has steps of：
Receiver selectivity ground is MIMO communication mode using multiple data stream transmission or single data stream transmission is that single input is many
Data and pilot signal that output communication mode sends from base station；And
From base station receive represent be transmitted by described multiple data stream or described single data stream transmission any to this
The control information that station is sent,
Described pilot signal is the signal configuring as follows：Described in regulation cell, base station is spread in forms data
The pilot signal sending when sending from the abutting subdistrict being adjacent to described regulation cell and different other base stations in described base station
The pilot signal sending when single data stream transmits mutually does not weigh in frequency direction and/or time-axis direction for each antenna
Close.
The present invention provides a kind of movement station, and the base station that its reception has multiple antennas is sent together with data using OFDM
Pilot signal it is characterised in that described movement station has：
Acceptance division, its receiver selectivity ground is MIMO communication mode using multiple data stream transmission or single data stream transmission is
Data and pilot signal that single input and multi-output communication mode sends from base station；And
Separated part, it will be separated with pilot signal by the data that described acceptance division receives,
Described acceptance division from base station receive represent be transmitted by described multiple data stream or described single data stream transmission
Any control information being sent to our station, and receive the pilot signal of following configuration：Described in regulation cell
Pilot signal that base station sends when single data stream transmits and in the abutting subdistrict being adjacent to described regulation cell and described base
The pilot signal that other base stations standing different send when single data stream transmits is for each antenna in frequency direction and/or time
Mutually misaligned on direction of principal axis.
Brief description
Fig. 1 is the outline figure of the present invention.
Fig. 2 is to control the reception antenna in the case of multiple data stream number in the communication environment according to movement station, such as SIR
Number, data fluxion, using antenna corresponding table.
Fig. 3 is the structure chart of the MIMO-OFDM communication system of the present invention.
Fig. 4 is the detailed structure view of base station.
Fig. 5 is the detailed structure view of movement station.
Fig. 6 is pilot tone P1 making each cell in the simultaneously misaligned pilot signal configuration example of frequency direction and time orientation.
Fig. 7 is sector strucre explanatory diagram.
Fig. 8 is the pilot signal configuration example in the 2nd embodiment.
Fig. 9 is the structure chart of the base station of the 2nd embodiment.
Figure 10 is the structure chart of the movement station of the 2nd embodiment.
Figure 11 is the structure chart of the dispensing device in ofdm communication system.
Figure 12 is serial parallel conversion specification figure.
Figure 13 is protection interval insertion explanatory diagram.
Figure 14 is the structure chart of OFDM transmission/receptidevice device.
Figure 15 is in specific subcarrier, and in the range of adjacent 4OFDM code element, pilot signal P is embedded in number
According to being distributed example in DT.
Figure 16 is multi-cell environment explanatory diagram.
Figure 17 is existing 1st pilot signal configuration example.
Figure 18 is existing 2nd pilot signal configuration example.
Figure 19 is the multi-cell environment explanatory diagram in MIMO-OFDM communication.
Figure 20 is the existing pilot signal configuration example in MIMO-OFDM communication.
Specific embodiment
（A）The outline of the present invention
Cell structure and pilot frequency configuration
Fig. 1 is the outline figure of the present invention, such as（A）Shown, base station BS in cell A, B, CA、BSB、BSCUsing 4
Antenna 1～4 carries out MIMO-OFDM communication with movement station.The pilot signal configuration such as Fig. 1 of the antenna 1～4 of each base station A, B, C
（B）Shown, in the closeer configuration of frequency axis direction, and in time orientation（In the initial 4OFDM code element of frame）Overlap configuration.Respectively
The pilot signal of the antenna 1～4 of base station is distinguished according to pattern, such as Fig. 1（C）Shown, P1 is the pilot signal of antenna 1, P2
It is the pilot signal of antenna 2, P3 is the pilot signal of antenna 3, P4 is the pilot signal of antenna 4, pilot signal power
It is set to P1 ＞ P2 ＞ P3 ＞ P4.It should be noted that aspect be, from the base station BS of each cellA、BSB、BSCThe 1st antenna 1 send
Pilot tone P1 be configured to misaligned in frequency direction.
Multiple data stream transmission and the streamed switching control of forms data
In the present invention, when the communication environment of movement station is bad, base station is MIMO communication mode from multiple data stream transmission
Being switched to single data stream transmission is single input and multi-output（SIMO）Communication mode.For example, when movement station MS and base station BSAEnter
Row communication is while when mobile, this movement station MS is present in close to base station BSARegion AR1 in, work as SIR（Signal is to jamming power
Than）Big and when communication environment is good, base station BSAFrom 4 antennas 1～4, data and pilot signal are sent to movement station, carry out
MIMO-OFDM communicates（Multiple data stream transmits）.
However, when movement station MS moves to cell border areas and so that SIR is reduced by from the interference of abutting subdistrict
When, even if carrying out MIMO-OFDM communication, BER also increases.Therefore, in this case, base station BSAIt is switched to number from 1 antenna
According to the single input and multi-output being sent to movement station with pilot signal（SIMO）Communication mode（Single data stream transmits）.
When this single data stream transmits, the base station BS of each cellA、BSB、BSCFrom the 1st antenna 1, data and pilot signal are sent out
Deliver to movement station, and from Fig. 1（B）It will be appreciated that when single data stream transmits from leading that antenna 1 sends in each cell A, B, C
Frequency P1 is configured to misaligned in frequency direction.That is, this pilot signal is configured to make in each cell when single data stream transmits
Pilot signal P1 for channel estimation and the pilot signal being used for channel estimation in abutting subdistrict when single data stream transmits
P1 is mutually misaligned in frequency direction.
As a result, due to cell each when single data stream transmits channel estimation with pilot signal P1 not with abutting subdistrict
Pilot signal P1 disturb, even if thus also improve in the SIR of cell boarder pilot signal, good channel estimation can be carried out.And
And, in Fig. 1（B）Example in, due to can by 3 subcarrier interval configuration from regulation antenna send pilot signal Pi（I=1
～4）, thus the channel estimation errors being produced due to interpolation processing when MIMO-OFDM communicates are reduced, and can carry out good letter
Road is estimated.
Although in addition, the channel estimation of each cell and is adjoined in frequency direction with pilot signal P1 when single data stream transmits
Pilot tone P2 of cell～P4 overlaps, but interference effect is little.Particularly, in Fig. 1（B）Configuration example in, due in single data stream
The power of pilot signal P2～P4 that the power ratio of pilot tone P1 sending from antenna 1 during transmission sends from other antennas 2～4 is big,
Thus pilot signal P2 beyond this pilot tone P1～P4 reaches after cell boarder is fully decayed, thus leading of abutting subdistrict can be made
The interference of frequency P2～P4 is slight.
The control of multiple data stream number
Be more than according to the communication environment of movement station, such as SIR has carried out multiple data stream transmission and forms data is streamed
The situation of switching control.In the case of this switching control, only need to make the power of pilot signal P1 be more than other pilot signals P2,
The power of P3, P4, it is poor that other pilot signal power need not be given.However, according to communication environment, the control of such as sir value
In the case of multiple data stream number processed, difference can be given to the power of each pilot signal and obtain P1 ＞ P2 ＞ P3 ＞ P4.
In MIMO multiplexing transmission, after overlapping in wireless channel due to the signaling point of each transmission antenna, reach receiver,
Thus data fluxion is more, the signal dot spacing of received signal points from shorter, for reaching the institute of certain bit error rate BER
SNR need to be received and get over and increase.In other words, even if data fluxion is fewer, SIR is less for reception, also can reach certain mistake ratio
Special rate.Therefore, in the present invention, multiple data stream number is controlled according to communication environment, such as sir value.For example, as shown in Figure 2 will
Communication environment is divided into 4 stages, in the worst environment（Communication environment 1）Middle data fluxion is set as 1, by use antenna compile
Number it is set as 1.In communication environment 2, data fluxion is set as 2, the antenna number of use is set as 1,2, in communication environment
In 3, data fluxion is set as 3, the antenna number of use is set as 1,2,3, by data flow in best communication environment 4
Number is set as 4, and the antenna number of use is set as 1,2,3,4.
As described above, by controlling multiple data stream number according to communication environment, MIMO-OFDM communication can be utilized as far as possible
Advantage.
Another pilot frequency configuration example
In Fig. 1（B）Pilot frequency configuration example in, the pilot tone P1 quilt that sends from the antenna 1 of each cell when single data stream transmits
It is configured to misaligned in frequency direction, but can be configured to simultaneously misaligned in time-axis direction, or only in time shafts side
To misaligned.
More than, according to the present invention, carry out the pilot signal that the streamed movement station of forms data uses in channel estimation and exist
In the cell adjoining each other, can be misaligned in time and/or frequency direction, even if carry out the streamed movement station of this forms data existing
Cell boarder, is not also affected by the interference signal from abutting subdistrict, can receive desired signal.
（B）1st embodiment
（a）The structure of MIMO-OFDM communication system
Fig. 3 is the structure chart of the MIMO-OFDM communication system of the present invention, and BS is base station, and MS is movement station.Base station BS is figure
1（A）The base station of such as cell A in shown cell A～C.Base station in each cell A～C has identical structure.
In base station BS, data flow D of number identical with transmission antenna number M0～DM-1Respectively in OFDM dispensing device 110~
11M-1Middle through predetermined processing, from each transmission antenna 120～12M-1Sent.As OFDM dispensing device 110～11M-1In place
Reason, has error correction, data modulation, data/control signals/pilot frequency multiplexing, scrambling, IFFT conversion, GI insertion etc..
From the antenna 12 being configured to mutually no correlation0～12M-1The signal being sent is by independent fading channel hnm（M=
0～M-1, n=0～N-1）It is re-used in space, afterwards by N root reception antenna 310～31N-1Receive.By each reception antenna institute
The signal receiving is in OFDM transmission/receptidevice device 320～32N-1It is middle that through down coversion, AD conversion, FFT, regularly detection, GI removal, FFT become
Change, descramble, data/control signals/pilot tone separate etc. processes, generating y0～yN-1Receiving data stream.Due to each receiving data stream
Have the M form sending after data flow multiplexing, thus data processing division 33 is by carrying out signal to all receiving data streams
Process, to separate and to reproduce transmission data flow D0～DM-1.
Send data flow D separating from receipt signal0～DM-1Signal processing algorithm in it is proposed that various method, right
MLD（Maximum Likelihood Decoding, maximum likelihood decoding）Algorithm illustrates.Now it is assumed that sending data flow
Represented by the complex matrix of M dimension, and receiving data stream represents then there is the relation of following formula by the complex matrix of n times unit.
［ formula 1 ］
Y=H·D
D=[D0·D1......DM-1]T
Y=[y0·y1.......yN-1]T
MLD algorithm is estimated to send data flow according to following formula（Send vector）D.
［ formula 2 ］
Here, the signaling point configuration number of the modulation data being separately input to M antenna is set as Q, then sends vector D's
There is Q in combinationMIndividual.Q=4 in QPSK.Q is produced in MLD algorithmMThe individual candidate sending vector（Copy）To carry out above formula
Computing, the copy that result is minimum is estimated as input data.
（b）The structure of base station BS
Fig. 4 is the detailed structure view of the base station BS in the case of M=4, is to control multiple data stream number according to communication environment
Embodiment.In addition, enclosing identical label to Fig. 3 identical part.
Data fluxion determination section 13 is as described later, according to the communication environment determination data fluxion of movement station MS and it is defeated
Enter to control information mapping portion 14 data stream cutting part 15.Control information mapping portion 14 is using the data being inputted fluxion as control
, to assigned position, to control information enforcement Error Correction of Coding process, data modulation unit 17 is to this for error correcting encoder 16 for information MAP processed
Control information carries out data modulation.
Data flow cutting part 15 is according to data fluxion logarithm it is believed that number carrying out S/P（Serial/parallel）Change and be input to
OFDM dispensing device 110～113.OFDM dispensing device 110～113According to each data flow D0～D3Generate each transmission antenna 120~
123Sending signal, and by it from this transmission antenna 120～123Send.By transmission antenna 120～123Antenna number be set as
1～4, then the transmission antenna numbering of data fluxion and use is as shown in Figure 2.OFDM dispensing device 110～113Have roughly the same
Structure, difference is, OFDM dispensing device 110Send control signal, and other OFDM dispensing devices 111～113Do not send control
Signal processed.
In OFDM dispensing device 110In, data D to the 1st data flow to be inputted for the error correcting encoder 210Implement error correction to compile
Code is processed, and data modulation unit 22 implements data modulation to input data.Pilot signal generating unit 23a produces pilot signal P1, increases
Beneficial adjustment portion 23b adjusts the amplitude of this pilot signal P1.The amplitude adjusting method of pilot signal is described below.
Then, data signal, control signal and pilot signal are multiplexed by data/pilot/control signal multiplexing unit 24,
The subcarrier component of parallel output N sampling.In addition, data/pilot/control signal multiplexing unit 24 is by pilot signal P1 such as Fig. 1（B）
The shown regulation subcarrier being mapped to regulation OFDM symbol.It is intrinsic that the subcarrier component that N samples is multiplied by cell by scrambling portion 25
Scrambler, the subcarrier component that IFFT Department 26 samples to N implements IFFT conversion process, the signal of frequency domain is converted into the letter of time domain
Number.GI insertion department 27 inserts protection interval（GI）, after transmission RF portion 28 carries out D/A conversion, from base-band frequency conversion to wireless frequency, enter
Row sends from transmission antenna 120 after amplifying.
With parallel, receiving RF portion 18 above, the signal sending from movement station MS is received, from wireless by reception antenna 19
Frequency, to base band, is input to control signal demodulation section 20 after being AD converted.Control signal demodulation section 20 is demodulated locating
Reason, demodulates the control signal fed back from movement station MS, extracts the down-link reception SIR information comprising in this control signal.
Down-link reception SIR represents the communication environment of movement station MS, be movement station MS receive from base station BS send pilot signal simultaneously
The reception SIR being measured using this pilot signal.Data fluxion determination section 13 is according to down-link reception SIR information according to Fig. 2
Voting data fluxion surely to be sent, and be entered into control information mapping portion 14 data stream cutting part 15.
（c）The decision method of data fluxion
The fundamental property of MIMO multiplexing transmission is studied.In MIMO multiplexing transmission, send from each transmission antenna
Signal reaches movement station MS after overlapping in wireless channel.Therefore, data fluxion is more, and the signal dot spacing of receipt signal is from just
Shorter, the required reception SIR for reaching certain bit error rate BER gets over and increases.In other words, even if data fluxion is got over
Few, SIR is less for reception, also can reach certain bit error rate BER.
And, receive SIR typically to extend with the distance between base station, movement station and reduce.Therefore, in order that data signal
Handling capacity maximum, measure and receive SIR, and this reception SIR is compareed with defined threshold, such that it is able to control into, connecing
Receive the high situation of SIR（Situation near base station for the movement station）Lower increase data fluxion, and receiving the low situation of SIR（Mobile
Stand in the situation near cell boarder）Lower minimizing data fluxion.
Therefore, data fluxion determination section 13 controls multiple data stream number according to receiving sir value.For example, will receive as shown in Figure 2
SIR（Communication environment）It is divided into 4 stages, in the worst environment（Communication environment 1）Middle data fluxion is set as 1, by use
Antenna number is set as 1.In communication environment 2, data fluxion is set as 2, the antenna number of use is set as 1,2, logical
In letter environment 3, data fluxion is set as 3, the antenna number of use is set as 1,2,3, will in best communication environment 4
Data fluxion is set as 4, and the antenna number of use is set as 1,2,3,4.
（d）Pilot signal amplitude
Below, to the mapping position of pilot signal in data/pilot/control signal multiplexing unit 24 and shaking of pilot signal
Width adjustment illustrates.
In the case that movement station is present near cell boarder, because the reception SIR of data signal is relatively low, thus data
Fluxion determination section 13 is to carry out forms data streamed mode determination data fluxion.Therefore, from the movement being present in cell boarder
From the point of view of the position of MS of standing, if can with quality to a certain degree only obtain single data stream transmission channel estimation value just much of that.
Therefore, fully improve from the used transmission antenna 12 of single data stream transmission0Send pilot signal P1 power come to carry out send out
Send.That is, in OFDM dispensing device 110Gain tuning portion 23b in increase pilot signal P1 amplitude come from transmission antenna 120Send out
Send, make from other transmission antennas 121、122、123Pilot signal P sending2、P3、P4Power be less than pilot signal P1 power
To be transmitted.As shown in Fig. 2 in the case of according to communication environment come control data fluxion, pilot signal power is set
For P1 ＞ P2 ＞ P3 ＞ P4.
Accordingly even when imparting difference power, from the point of view of the position of the movement station MS near base station, due to leading in wireless channel
The attenuation of frequency signal is less, thus the impact to precision of channel estimation is little.
（e）Pilot frequency configuration method
Fig. 1（B）3 cells A, B, the pilot signal configuration example in C, be to configure by the initial 4OFDM code element of frame to lead
Frequency signal and the example in the closeer configuration of frequency axis direction.
The base station BS of each cell when single data stream transmitsA、BSB、BSCFrom the 1st antenna 120By data and pilot signal P1
Be sent to movement station, and according to above-mentioned pilot signal configure example, each cell A, B, C pilot tone P1 misaligned in frequency direction.That is,
This pilot signal is configured to make be used for pilot signal P1 of channel estimation in each cell when single data stream transmits and in neighbour
Connect in cell be used for when single data stream transmits channel estimation pilot signal P1 mutually misaligned in frequency direction.
For the movement station MS of cell boarder, the power due to being only from pilot signal P1 of other cells is big, thus dry
It is overriding for disturbing.Therefore, it is necessary to not produce the interference to other cells for pilot signal P1.Due to the movement to cell boarder
The MS that stands carries out single data stream transmission, as long as thus pilot signal P1 sending in the transmission of this single data stream is not subject to other cells
The interference of pilot signal P1.Therefore, as long as the position of each cell A, B, pilot signal P1 of C is mutually different, even if
This pilot signal P1 is configured in the transmission antenna 12 with other cells1～123In pilot signal P2 of either one～P4 identical
Position there is no fault yet.
According to Fig. 1（B）Pilot frequency configuration, due to the channel estimation pilot tone of cell A, B each when single data stream transmits, C
Signal P1 is not disturbed with pilot signal P1 of abutting subdistrict, even if thus also improve in the SIR of cell boarder pilot signal, can enter
The good channel estimation of row.And, in Fig. 1（B）Example in, due to can by 3 subcarrier interval configuration send out from regulation antenna
Pilot signal Pi sent（I=1～4）, thus produced due to interpolation processing when multiple data stream transmission is MIMO-OFDM communication
Channel estimation errors reduce, good channel estimation can be carried out.That is, due to can be by the pilot tone of any antenna in arbitrary cells
The subcarrier interval of signal is kept as little, thus can improve interpolation precision, can achieve the channel that can follow channel variation drastically
Estimate.
（f）The structure of movement station
Fig. 5 is the detailed structure view of the movement station MS in the case of N=4.Enclose identical mark to Fig. 3 identical part
Number.
Each reception antenna 310～313Receipt signal be imported into OFDM transmission/receptidevice device 320～323.Each OFDM receives dress
Put 320～323There is identical structure, receive RF portion 41 and the frequency of receipt signal is converted to base band from wireless frequency, carry out A/D
It is input to FFT timing test section 42 and GI removal portion 43 after conversion.FFT timing test section 42 detection FFT timing, GI removal portion 43
GI is removed according to this FFT timing, the parallel data as N sampling is input to FFT portion 44.FFT portion 44 is by the N sampled signal of time domain
Be converted to N number of subcarrier signal component of frequency domain, this N number of subcarrier signal component is multiplied by the scrambler with base station BS by descrambling portion 45
Identical code, extracts the signal receiving from this base station and outputs it.Data/pilot/control signal separated part 46 will be mapped to
The data signal of assigned position, pilot signal, control signal carry out separating, and data signal is input to data processing equipment 33
MIMO demodulation section 51, pilot signal is input to channel estimation unit 52, and control signal is input to control signal demodulation section 53.
Channel estimation unit 52 obtains channel estimation value first against the subcarrier of the OFDM symbol being embedded with pilot signal.
That is, carry out from each reception antenna 310～313Reception pilot signal and known pilot signal transmitted related operation, and
The correlation being obtained is carried out homophase addition between 4 code elements, is derived from inhibiting from abutting subdistrict to a certain extent
Interference signal channel estimation value.Then, channel estimation unit 52 be directed to these antenna each side by channel estimation value in the time or
Frequency direction carries out interpolation or extrapolation interpolation, obtains channel estimation in subcarrier for the OFDM symbol being not embedded into pilot signal
Value.Afterwards, channel estimation unit 52 is directed to each antenna, and channel estimation value in each subcarrier for each OFDM symbol is input to MIMO
Demodulation section 51 and control signal demodulation section 53.
Control signal demodulation section 53 is using channel estimation value come to from 1 transmission antenna 120Send and by 4 reception antennas
310～313The control signal receiving implements channel compensation, carries out diversity and add up to demodulate control information between reception antenna, extracts
It is input to MIMO demodulation section 51 after the information of data fluxion of the assigned position being mapped to this control signal.
MIMO demodulation section 51 enters according to data fluxion, receiving data signal and channel estimation value using each reception antenna
Known mimo channel of going separates, and carries out inciting somebody to action after P/S conversion to by each data flow that this mimo channel separation computing is obtained
Its output, thus recover data signal.
And, SIR estimator 34 is estimated using the channel estimation value estimated by channel estimation unit 52 to receive SIR.Tool
Say, by the channel estimation value between specific transmission antenna and reception antenna body（Plural number）Real part and imaginary part respective
Quadratic sum is considered as desired signal power S, and the dispersion value in multiple code elements is considered as interfering signal power I, and the ratio of S and I is used as
Receive the estimated value of SIR.SIR estimated value to be mapped to assigned position as control information by control information mapping portion 35, controls
Signal modulation portion 36 is modulated etc. by Error Correction of Coding data and processes generating control signal, and with not shown data and leading
Send to base station BS from transmission antenna 37 after frequency signal multiplexing.
（g）Other pilot frequency configuration example
In Fig. 1（B）Pilot signal configuration example in, be pilot tone P1 making each cell in the misaligned example of frequency direction,
But also can make each cell pilot tone P1 simultaneously misaligned in frequency direction and time orientation.
Fig. 6 is pilot tone P1 making each cell in the simultaneously misaligned pilot signal configuration example of frequency direction and time orientation.
In this pilot signal configuration example, every a configuration pilot tone letter in the 4OFDM code element and 4OFDM code element below of beginning
Number, and make the subcarrier difference of configuration pilot signal.And, make each cell A, B, C pilot signal P1 in frequency direction not
Overlap, and make cell B pilot signal P1 also misaligned in time orientation with pilot signal P1 of cell A, C.
In addition, in the case of inter-base station synchronizing system, it would however also be possible to employ pilot tone P1 of each cell is only in time orientation not
The pilot signal configuration overlapping.
（h）Variation
1st embodiment is according to the communication environment of movement station（Receive SIR）Data flow numerical control is made as any one of 1～4,
But can also be configured to, according to the communication environment of movement station（Receive SIR）Being switched to multiple data stream transmission is MIMO communication party
Formula and single data stream transmission are single input and multi-output（SIMO）The either type of communication mode is sending data and pilot signal.
（C）2nd embodiment
In the 1st embodiment, illustrate that the interference receiving from abutting subdistrict for the movement station MS reducing cell boarder is believed
Number impact method.In the case that 1 cell is made up of multiple sectors, it is possible to use same procedure reduces sector borders
The impact of interference signal that receives from adjacent sector of movement station.
（a）Sector strucre and pilot signal configuration
Fig. 7 is shown as the sector strucre of premise.Cell is divided into 3 sub-regions that central angle is respectively 120 °, profit
With having the antenna A of the directivity covering each sub-regions1～A4、B1～B4、C1～C4To form sector A, B, C.In movement station
In the case that MS is located at CAR near the central authorities of sector A, only receive fan antenna A from base station BS1～A4Signal, and moving to
In the case of near the border of sector A, B, will be from fan antenna B1～B4Signal to receive as interference signal.
Generally, by following these interference signals of suppression.That is, in base station BS, by the extension of extended code or repeat to come
The information of 1 code element is copied in multiple code elements, is multiplied by the intrinsic scrambler in sector afterwards to send.In movement station MS, it is multiplied by
With despreading or the homophase additive operation carrying out extended code after base station BS identical scrambler, thus to a certain extent suppression be derived from
The interference signal of adjacent sector.However, with regard to pilot signal, due to being sent with higher-wattage, even if thus having carried out above-mentioned place
Reason, remains on and produces interference to adjacent sector, and the impact bringing to this adjacent sector is big.Particularly, the pilot tone letter in each sector
Number configuration be public in the case of, the pilot signal due to each sector interferes, thus precision of channel estimation deterioration.
In the 2nd embodiment, as the 1st embodiment, transmission antenna A used in single data stream transmission1、B1、C1's
Pilot signal P1 is sent with very high power, transmission antenna A2～A4、B2～B4、C2～C4Pilot signal P2, P3, P4 with than
Transmission antenna A1、B1、C1The low power of pilot signal send.That is, pilot signal P1, P2, the transmit power of P3, P4 are set
For P1 ＞ P2, P3 ＞ P4.And, with regard to pilot signal configuration, as the 1st embodiment, be configured to as shown in Figure 8 to make sector A,
Transmission antenna A in B, C1、B1、C1Pilot signal P1 position mutually different.
So, as long as the movement station of sector borders carries out single data stream transmission, the pilot tone of other sectors in channel estimation
Effect of signals is just slight, so stable reception can be carried out.Therefore, in the case that movement station MS is located at sector borders, as long as will
Transmission data fluxion be switched to 1, with regard to always can carry out stable receive and unrelated with the position in sector.
（b）The structure of base station
Fig. 9 is the structure chart of the base station BS of the 2nd embodiment, and the difference with the 1st embodiment of Fig. 4 is that downlink connects
Receive SIR information and sector borders decision bit is mapped to the control signal fed back from movement station MS, phase is enclosed to same section
Same label.
Control signal demodulation section 20 demodulates the control information sending from movement station MS, and down-link reception SIR is believed
Breath and sector borders decision bit are input to data fluxion determination section 13.When sector borders decision bit is " 0 ", represents and move
The MS that stands is located at sector central authorities, when being " 1 ", represents that movement station MS is located at sector borders.Data fluxion determination section 13 is according to reception
SIR information and sector borders decision bit carry out determination data fluxion.Specifically, first, when sector borders decision bit is " 1 "
When, data fluxion is determined as 1.On the other hand, when sector borders decision bit is " 0 ", as the 1st embodiment, pass through
Carry out compareing determination data fluxion with defined threshold by receiving SIR information.
（c）The structure of movement station
Figure 10 is the structure chart of the movement station of the 2nd embodiment, and the later process in FFT portion 44 is different from the 1st embodiment.And
And, OFDM acceptance division 320～323The structure of data processing unit 33 is different.That is, OFDM acceptance division 320～323By reception RF portion
41st, FFT timing test section 42, GI removal portion 43 and FFT portion 44 are constituted.Data processing equipment 33 has at the 1st sector signals
Reason portion 33a, the 2nd sector signals processing unit 33b and the 3rd sector signals processing unit 33c.
In the 1st sector signals processing unit 33a, with OFDM acceptance division 320～323Corresponding each descrambling portion 45 will be from each FFT
N number of subcarrier signal component of portion 44 output is multiplied by the scrambler identical code with sector A, extracts the signal receiving from this sector A
And output it.Then, each data/pilot/control signal separated part 46 will be mapped to the data signal of assigned position, pilot tone letter
Number, control signal carry out separate, respectively data signal is input to the MIMO demodulation section 51 of data processing equipment 33, pilot tone is believed
Number it is input to channel estimation unit 52, control signal is input to control signal demodulation section 53.After, as the 1st embodiment, letter
Road estimator 52 estimates the channel in the sector A that movement station MS exists, and control signal demodulation section 53 demodulating control signals are by number
It is input to MIMO demodulation section 51 according to fluxion, output it after MIMO demodulation section 51 demodulated data signal.
On the other hand, the 2nd sector signals processing unit 33b will be from OFDM acceptance division 320～323FFT portion 44 output N number of
Subcarrier signal component is multiplied by the scrambling code identical code with sector B, extracts and outputs it after the signal that this sector B receives.
Then, the 2nd sector signals processing unit 33b will be mapped to the pilot signal of assigned position and carries out separating, and as the 1st embodiment
Estimate the channel in the B of sector.Equally, the 3rd sector signals processing unit 33c carries out the channel estimation of sector C.
SIR estimator 34, using the channel estimation value estimated by channel estimation unit 52, adopts and the 1st embodiment identical
Method is estimating the down-link reception SIR from sector A.Sector borders detection unit 38 uses the 1st～the 3rd sector signals to process
The channel estimation value of portion 33a～33c is generating sector borders decision bit.Specifically, by channel estimation value（Plural number）Reality
The several respective quadratic sums with imaginary part are considered as desired signal power, between the 1st, the 2nd sector signals processing unit 33a, 33b
Desired signal power difference or the 1st, the 3rd sector signals processing unit 33a, 33c between desired signal power difference less than regulation
In the case of threshold value, it is judged to that movement station is located near sector borders, sector borders decision bit is set as " 1 ".At other
In the case of, sector borders decision bit is set as " 0 ".SIR estimated value and sector borders are judged by control information mapping portion 35
Bit to map as control information, and control signal modulation portion 36 processes to generate control by Error Correction of Coding data modulation etc.
Signal, and with not shown data and pilot signal multiplexing after send from transmission antenna 37.
Effect
According to the present invention, due to make to be used for when single data stream transmits in regulation cell the pilot signal of channel estimation and
It is used for the pilot signal of channel estimation when single data stream transmits in frequency direction and/or time-axis direction phase in abutting subdistrict
Mutually misaligned, thus can prevent from movement station be not communication in other cells pilot signal interference while, carry out
The channel estimation of high precision.
And, according to the present invention, due to making to be used for the pilot tone of channel estimation in regulation cell when single data stream transmits
Signal and in abutting subdistrict when single data stream transmits be used for channel estimation pilot signal in frequency direction and/or time shafts
Direction is mutually misaligned, and makes the pilot tone letter for channel estimation sending when described single data stream transmits from regulation antenna
Number the power of pilot signal that sends from other antennas of power ratio big, thus be present in the situation of cell boarder in movement station
Under, can fully reduce the interference between pilot signal, and can carry out following the channel estimation of channel variation drastically.In addition,
Also above effect can be produced in the case of having carried out sectorization.
And, according to the present invention, the pilot tone due to can shorten regulation antenna inserts subcarrier interval, thus is carrying out
In the case of MIMO-OFDM communication, even if there is channel variation drastically, also can achieve the channel estimation that can follow this variation.
Claims (7)
1. the communication means in a kind of base station, this base station has multiple antennas, and uses OFDM by pilot signal together with data
It is sent to movement station, this communication means is characterised by, has steps of：
Receive the data determining communication environment from movement station；
According to described communication environment, decision is to be MIMO communication mode using multiple data stream transmission or is spread using forms data
I.e. single input and multi-output communication mode is sent to send data and pilot signal to movement station；
To configure this pilot signal as follows：Regulation cell in base station use the 1st antenna send pilot signal and
In the abutting subdistrict being adjacent to this regulation cell, other base station different with described base station uses the pilot tone letter that the 2nd antenna sends
Number mutually misaligned at least one of frequency direction and time-axis direction, described 2nd antenna when multiple data stream sends, its
Antenna number is identical with described 1st antenna, and described antenna number is the volume for identifying the antenna using according to data fluxion
Number,
Sending described data, pilot signal and expression to described movement station is to be transmitted by described multiple data stream or described forms data
Any control information being transmitted in streaming.
2. communication means according to claim 1 is it is characterised in that this communication means has steps of：
Receive the pilot signal sending from described base station in the mobile stations and measure communication environment, and this communication environment will be determined
Data feedback is to base station.
3. the communication means in a kind of base station, this base station has multiple antennas, and cell is carried out sectorization, makes for each sector
With OFDM, pilot signal and data are sent jointly to movement station, this communication means is characterised by, has steps of：
Receive the data determining communication environment from movement station；
According to described communication environment, decision is to be MIMO communication mode using multiple data stream transmission or is spread using forms data
I.e. single input and multi-output communication mode is sent to send data and pilot signal to the movement station in sector；
To configure this pilot signal as follows：Regulation sector in base station use the 1st antenna send pilot signal and
In the adjacent sector be adjacent to this regulation sector, this base station uses the pilot signal of the 2nd antenna transmission in frequency direction and time
Axial mutually misaligned at least one, described 2nd antenna when multiple data stream sends, its antenna number and the described 1st
Antenna is identical, and described antenna number is the numbering for identifying the antenna using according to data fluxion,
Sending described data, pilot signal and expression to described movement station is to be transmitted by described multiple data stream or described forms data
Any control information being transmitted in streaming.
4. a kind of base station, it has multiple antennas, and using OFDM, pilot signal and data is sent jointly to movement station, this base
Stand and be characterised by, have：
Acceptance division, it receives the data determining communication environment from movement station；
Communication mode determination section,, according to described communication environment, decision is to be that MIMO communication mode enters using multiple data stream transmission for it
Row communicates or is that single input and multi-output communication mode is communicated using single data stream transmission；
Pilot frequency locations control unit, the position control of this pilot signal is become by it：This base station in regulation cell is made to use the 1st antenna
The pilot signal sending is with other base stations in the abutting subdistrict being adjacent to described regulation cell using leading that the 2nd antenna sends
Frequency signal is mutually misaligned at least one of frequency direction and time-axis direction, and described 2nd antenna sends in multiple data stream
When, its antenna number is identical with described 1st antenna, and described antenna number is for identifying the antenna using according to data fluxion
Numbering；And
Sending part, sending described data, pilot signal and expression to described movement station is to be transmitted by described multiple data stream or institute
State any control information being transmitted in single data stream transmission.
5. a kind of base station, it has multiple antennas, and cell is carried out sectorization, uses OFDM by pilot signal for each sector
Send jointly to movement station with data, this base station is characterised by having：
Acceptance division, it receives the data determining communication environment from movement station；
Communication mode determination section,, according to described communication environment, decision is to be that MIMO communication mode enters using multiple data stream transmission for it
Row communicates or is that single input and multi-output communication mode is communicated using single data stream transmission；
Pilot frequency locations control unit, the position control of this pilot signal is become by it：This base station in regulation sector is made to use the 1st antenna
The pilot signal of transmission and the pilot tone that this base station is sent using the 2nd antenna in the adjacent sector being adjacent to described regulation sector
Signal is mutually misaligned at least one of frequency direction and time-axis direction, described 2nd antenna when multiple data stream sends,
Its antenna number is identical with described 1st antenna, and described antenna number is for identifying the antenna using according to data fluxion
Numbering；And
Sending part, sending described data, pilot signal and expression to described movement station is to be transmitted by described multiple data stream or institute
State any control information being transmitted in single data stream transmission.
6. the communication means in a kind of movement station, the base station that the reception of this movement station has multiple antennas utilizes OFDM together with data
The pilot signal sending, this communication means is characterised by, has steps of：
Send the data determining communication environment from movement station to base station, described base station determines it is using most according to this communication environment
It is MIMO communication mode according to streaming and single data stream transmission is which in single input and multi-output communication mode carries out data
Send；And
From base station receive represent be transmitted by described multiple data stream or the transmission of described single data stream any enter to our station
Go the control information sending, and, from this base station receiving data and pilot signal,
Described pilot signal is the signal configuring as follows：Described in regulation cell, base station uses the 1st antenna to send
Pilot signal from the abutting subdistrict being adjacent to described regulation cell and different other base stations in described base station use the 2nd
The pilot signal that antenna sends is mutually misaligned at least one of frequency direction and time-axis direction, and described 2nd antenna exists
When multiple data stream sends, its antenna number is identical with described 1st antenna, and described antenna number is according to data fluxion for identification
And the numbering of the antenna using.
7. a kind of movement station, its reception has the pilot signal that the base station of multiple antennas is sent together with data using OFDM,
It is characterized in that, described movement station has：
Sending part, it sends the data determining communication environment to base station, and described base station determines it is using many according to this communication environment
Data stream is MIMO communication mode and single data stream transmission is which in single input and multi-output communication mode enters line number
According to transmission；
Acceptance division, its receiver selectivity ground is MIMO communication mode using multiple data stream transmission or single data stream transmission is single defeated
Enter data and the pilot signal that multi output communication mode sends from base station；And
Separated part, it will be separated with pilot signal by the data that described acceptance division receives,
Described acceptance division from base station receive represent be transmitted by described multiple data stream or described single data stream transmission which
Plant the control information being sent to our station, and receive the pilot signal of following configuration：Base station described in regulation cell
The pilot signal being sent using the 1st antenna from the abutting subdistrict being adjacent to described regulation cell and described base station is different
The pilot signal that other base stations are sent using the 2nd antenna does not mutually weigh at least one of frequency direction and time-axis direction
Close, when multiple data stream sends, its antenna number is identical with described 1st antenna for described 2nd antenna, described antenna number be for
Identify the numbering of the antenna using according to data fluxion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310081879.2A CN103138910B (en) | 2006-03-20 | 2006-03-20 | Communication means in communication means in base station, base station, movement station and movement station |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006800521604A CN101336523A (en) | 2006-03-20 | 2006-03-20 | Base station and MIMO-OFDM communication method thereof |
| CN201310081879.2A CN103138910B (en) | 2006-03-20 | 2006-03-20 | Communication means in communication means in base station, base station, movement station and movement station |
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| CNA2006800521604A Division CN101336523A (en) | 2006-03-20 | 2006-03-20 | Base station and MIMO-OFDM communication method thereof |
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| CN201310081578.XA Expired - Fee Related CN103281169B (en) | 2006-03-20 | 2006-03-20 | Communication means, base station, mobile radio station and wireless communication system |
| CN201310081879.2A Expired - Fee Related CN103138910B (en) | 2006-03-20 | 2006-03-20 | Communication means in communication means in base station, base station, movement station and movement station |
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| CN104243121B (en) * | 2014-09-11 | 2017-06-06 | 西安交通大学 | In a kind of Massive mimo systems based on cell sectoring pilot distribution method |
| CN104796247A (en) * | 2015-04-24 | 2015-07-22 | 北京邮电大学 | Resource allocation method for large-scale MIMO (multiple input multiple output) communication systems |
| CN109861800A (en) * | 2018-07-27 | 2019-06-07 | 北京新岸线移动通信技术有限公司 | A kind of radio data transmission method and system |
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| EP1178641B1 (en) * | 2000-08-01 | 2007-07-25 | Sony Deutschland GmbH | Frequency reuse scheme for OFDM systems |
| US20020193146A1 (en) * | 2001-06-06 | 2002-12-19 | Mark Wallace | Method and apparatus for antenna diversity in a wireless communication system |
| US20030125040A1 (en) * | 2001-11-06 | 2003-07-03 | Walton Jay R. | Multiple-access multiple-input multiple-output (MIMO) communication system |
| US20060009168A1 (en) * | 2004-07-12 | 2006-01-12 | Lucent Technologies, Inc. | Method for controlling transmissions using both diversity and nondiversity transmission schemes |
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| Title |
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| Downlink Multiple Access Aspect of FDD LTE;RITT;《3GPP TSG RAN WG1 Meeting #41》;20050513;全文 * |
| Pilot Channel Structure in Evolved UTRA Downlink;NTT DoCoMo等;《3GPP TSG RAN WG1 #42 on LTE》;20050902;全文 * |
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| CN103281169B (en) | 2016-03-30 |
| CN103138910A (en) | 2013-06-05 |
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