CN108880764A - Discrete pilot interposition method and device in OFDM-MIMO communication system - Google Patents
Discrete pilot interposition method and device in OFDM-MIMO communication system Download PDFInfo
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- CN108880764A CN108880764A CN201710316675.0A CN201710316675A CN108880764A CN 108880764 A CN108880764 A CN 108880764A CN 201710316675 A CN201710316675 A CN 201710316675A CN 108880764 A CN108880764 A CN 108880764A
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- 238000004891 communication Methods 0.000 title claims abstract description 30
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 239000000969 carrier Substances 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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Abstract
The present invention provides discrete pilot interposition method and devices in a kind of OFDM-MIMO communication system, which is characterized in that including：In the case of being transmitted and received for two antennas, the scattered pilot of two antennas is close in a certain range in OFDM frequency domain resource, it is uniform that appropriateness is spaced in time-domain resource, so that the scattered pilot interval being inserted into is moderately uniform, both pilot signal had not been allowed to be perfected monopoly some OFDM symbol or some subcarrier, the pilot signal of two antenna transmittings is not allowed to be overlapped yet, to while having taken into account saving ofdm system time/frequency source block, also reducing two antenna transmitting signal overlap brings to greatest extent influences, the scattered pilot of two antennas as close as possible to, it is also possible that the characteristic of channel that receiving end estimates two antennas respectively is close as far as possible, improve the accuracy of channel estimation.
Description
Technical field
The invention belongs to the communications field more particularly to wireless broadband communication orthogonal frequency division multiplexing-multiple-input and multiple-outputs
(OFDM-MIMO) discrete pilot interposition method and device of system.
Background technique
Orthogonal frequency division multiplexing (OFDM) technology and multiple-input, multiple-output (MIMO) technology are current Wireless Broadband Communication Systems applications
Hot technology, have a wide range of applications in digital wireless communication field.In common ofdm system, require to provide in time-frequency
Pilot tone is inserted into source to be used for channel estimation.After OFDM technology is combined with MIMO technology, insertion pilot tone is also needed.
Since MIMO technology is to emit different pilot frequency sequences using different antennas, it is common practice to difference transmitting day
The different pilot frequency sequences that line issues can be overlapped on time-domain and frequency-domain resource block, need to use the side of Digital Signal Processing in receiving end
Method separates the pilot frequency sequence of different antennae, then does channel estimation respectively again.Although such method can save part
For the running time-frequency resource of wireless transmission, but due to the overlapping of more transmitting antenna signals, so that pilot tone isolation technics is more multiple
Miscellaneous, pilot tone separation failure can also be made by improperly handling, to reduce the reliability of transmission.
Summary of the invention
To solve the above-mentioned problems, the invention proposes discrete pilot interposition methods in a kind of OFDM-MIMO communication system
And device, this method and device are suitable for the case where double antenna is received and dispatched.
In OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, have the feature that,
Including：In the case of being transmitted and received for double antenna, position coordinates (x, y) of the scattered pilot on OFDM running time-frequency resource by with
Lower formula is calculated：
Wherein：X is subcarrier serial number, and 0≤x≤C-1；C is subcarrier total number, and C >=24；Y is OFDM symbol sequence
Number, and 0≤y≤S-1；S is OFDM symbol sum, and S >=4；A is antenna serial number, and a=0,1；I is in previous OFDM symbol
Scattered pilot serial number, has
Indicate downward round numbers part.
Still optionally further, in OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, also
Can have such feature, wherein OFDM symbol sum value is S=4, and subcarrier total number value is C=24,
In such cases,
Still optionally further, in OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, also
It can have such feature, wherein then the scattered pilot position coordinates of two antennas are as follows：
Antenna a=0：(6,0),(12,0),(18,0),(6,1),(18,1),(12,2),(6,3),(12,3),(18,3)；
Antenna a=1：(7,0),(13,0),(19,0),(7,1),(19,1),(13,2),(7,3),(13,3),(19,3).
Still optionally further, in OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, also
Can have such feature, wherein OFDM symbol sum value is S=5, and subcarrier total number value is C=26,
In such cases,
Still optionally further, in OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, also
It can have such feature, wherein then the scattered pilot position coordinates of two antennas are as follows：
Antenna a=0：(6,0),(12,0),(18,0),(24,0),(6,1),(18,1),(12,2),(24,2),(6,3),
(18,3),(6,4),(12,4),(18,4),(24,4)；
Antenna a=1：(7,0),(13,0),(19,0),(25,0),(7,1),(19,1),(13,2),(25,2),(7,3),
(19,3),(7,4),(13,4),(19,4),(25,4)。
Still optionally further, in OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, also
It can have such feature, wherein close in scattered pilot a certain range of two antennas.
Still optionally further, in OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, also
It can have such feature, wherein the scattered pilot of two antennas is adjacent.
Still optionally further, in OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, also
It can have such feature, wherein the scattered pilot of two antennas is adjacent, and the scattered pilot interval being inserted into is moderately equal
It is even.
Still optionally further, in OFDM-MIMO communication system provided by the present invention in discrete pilot interposition method, also
It can have such feature, wherein the scattered pilot being inserted into：Symbol in the intercarrier spacing and time domain of frequency domain sub-carriers
Between be spaced appropriateness it is uniform.
In addition, having such the present invention also provides scattered pilot insertion apparatus in a kind of OFDM-MIMO communication system
Feature, including：
Scattered pilot is inserted into module, and in the case of being transmitted and received for double antenna, scattered pilot is in OFDM time-frequency
Position coordinates (x, y) in resource are calculated by following formula：
Wherein：X is subcarrier serial number, and 0≤x≤C-1；C is subcarrier total number, and C >=24；Y is OFDM symbol sequence
Number, and 0≤y≤S-1；S is OFDM symbol sum, and S >=4；A is antenna serial number, and a=0,1；I is in previous OFDM symbol
Scattered pilot serial number, has
Indicate downward round numbers part.
The function and effect of the present invention：
What is proposed through the invention is suitable for the scattered pilot insertion side of the OFDM-MIMO communication system of double antenna transmitting-receiving
Method and device have not only taken into account time-domain resource block, the frequency domain resource block for saving ofdm system, have also reduced difference to greatest extent
Antenna, which emits signal overlap bring, to be influenced, so that the complexity for handling receiving end signal substantially reduces.In addition, two antennas
Scattered pilot be designed as the characteristic of channel that may make receiving end to estimate two antennas respectively as close as possible to such scheme
It is close as far as possible, the accuracy of channel estimation is improved, the repetition to the characteristic of channel is reduced and estimates and calculate, complexity decline.
Detailed description of the invention
Fig. 1 is scattered pilot insertion position schematic diagram in the first embodiment of the present invention；
Fig. 2 is scattered pilot insertion position schematic diagram in the second embodiment of the present invention.
Specific embodiment
It is illustrated in conjunction with scattered pilot interleaved plan of the Fig. 1 and Fig. 2 to OFDM-MIMO communication system.In embodiment, from
Position coordinates (x, y) of the pilot tone in OFDM time-domain resource, in frequency domain resource are dissipated to be calculated by following formula：
Wherein：
● x is subcarrier serial number, and 0≤x≤C-1；
● C is subcarrier total number, and C >=24；
● y is OFDM symbol serial number, and 0≤y≤S-1；
● S is OFDM symbol sum, and S >=4；
● a is antenna serial number, and a=0,1；
● i is scattered pilot serial number in previous OFDM symbol, is had
Indicate downward round numbers part.
Oneself each comfortable scattered pilot position of two transmitting antennas of MIMO emits pilot signal, in oneself non-discrete
Pilot frequency locations do not emit signal.The scattered pilot insertion realized using such method, did not both allow pilot signal to perfect monopoly
Some OFDM symbol or some subcarrier do not allow the pilot signal of two antenna transmittings to be overlapped yet, to save having taken into account
While ofdm system time/frequency source block, also reducing two antenna transmitting signal overlap brings to greatest extent influences.Two
The scattered pilot of a antenna is as close as possible to it is also possible that receiving end connects the characteristic of channel that two antennas estimate respectively as far as possible
Closely, the accuracy of channel estimation is improved.Scattered pilot interval appropriateness (such as the carrier wave employed in embodiment of the method insertion
Between between be divided into 6, be divided into 1) between intersymbol, but also receiving end only needs to do simple linear interpolation or filter when doing channel estimation
Wave can reach preferable channel estimation effect.To substantially reduce the complexity of receiving end signal processing.
First embodiment：S=4, C=24
In such cases,
Then the scattered pilot position coordinates of two antennas are as follows：
First antenna a=0：(6,0),(12,0),(18,0),(6,1),(18,1),(12,2),(6,3),(12,3),
(18,3)
Second antenna a=1：(7,0),(13,0),(19,0),(7,1),(19,1),(13,2),(7,3),(13,3),
(19,3)
Fig. 1 gives under the embodiment, and the method for the invention is inserted into the position of scattered pilot in OFDM running time-frequency resource
Figure.Reticulate pattern lattice square indicates the scattered pilot insertion position of first antenna (antenna 0), and twill lattice square indicates the second antenna (day
Line 1) scattered pilot insertion position, white square indicates non-discrete pilot frequency locations.First antenna (antenna 0) is only in reticulate pattern lattice side
Block emits discrete guide-frequency signal, and the second antenna (antenna 1) only emits discrete guide-frequency signal in twill lattice square.
Second embodiment：S=5, C=26
In such cases,
Then the scattered pilot position coordinates of two antennas are as follows：
First antenna a=0：(6,0),(12,0),(18,0),(24,0),(6,1),(18,1),(12,2),(24,2),
(6,3),(18,3),(6,4),(12,4),(18,4),(24,4)
Second antenna a=1：(7,0),(13,0),(19,0),(25,0),(7,1),(19,1),(13,2),(25,2),
(7,3),(19,3),(7,4),(13,4),(19,4),(25,4)
Fig. 2 gives under the embodiment, and the method for the invention is inserted into the position of scattered pilot in OFDM running time-frequency resource
Figure.Reticulate pattern lattice square indicates the scattered pilot insertion position of first antenna (antenna 0), and twill lattice square indicates the second antenna (day
Line 1) scattered pilot insertion position, white square indicates non-discrete pilot frequency locations.First antenna (antenna 0) is only in reticulate pattern lattice side
Block emits discrete guide-frequency signal, and the second antenna (antenna 1) only emits discrete guide-frequency signal in twill lattice square.
Those of ordinary skill in the art it should be appreciated that more than specification be only the numerous embodiments of the present invention
One or more of embodiment, and not use limitation of the invention.Any equalization for embodiment described above becomes
The technical solutions such as change, modification and equivalent substitute will all fall in power of the invention as long as meeting spirit of the invention
In the range of sharp claim is protected.
Claims (10)
1. discrete pilot interposition method in a kind of OFDM-MIMO communication system, which is characterized in that including：
In the case of being transmitted and received for two antennas, the scattered pilot of two antennas certain model in OFDM frequency domain resource
Enclose it is interior close, in time-domain resource be spaced appropriateness it is uniform.
2. discrete pilot interposition method in OFDM-MIMO communication system as described in claim 1, which is characterized in that
Wherein, the scattered pilot of two antennas is adjacent in OFDM frequency domain resource.
3. discrete pilot interposition method in OFDM-MIMO communication system as claimed in claim 2, which is characterized in that
Wherein, the scattered pilot of two antennas is adjacent, and the scattered pilot interval being inserted into is moderately uniform.
4. discrete pilot interposition method in OFDM-MIMO communication system as described in claim 1, which is characterized in that including：Needle
In the case of transmitting and receiving to double antenna, position coordinates (x, y) of the scattered pilot on OFDM running time-frequency resource are by following formula
It is calculated：
Wherein：X is subcarrier serial number, and 0≤x≤C-1；C is subcarrier total number, and C >=24；Y is OFDM symbol serial number, and
0≤y≤S-1；S is OFDM symbol sum, and S >=4；A is antenna serial number, and a=0,1；I is discrete in previous OFDM symbol leads
Frequency serial number, has
Indicate downward round numbers part.
5. discrete pilot interposition method in OFDM-MIMO communication system as claimed in claim 4, which is characterized in that
Wherein, OFDM symbol sum value is S=4, and subcarrier total number value is C=24,
In such cases,
6. discrete pilot interposition method in OFDM-MIMO communication system as claimed in claim 5, which is characterized in that
Wherein, then the scattered pilot position coordinates of two antennas are as follows：
Antenna a=0：(6,0),(12,0),(18,0),(6,1),(18,1),(12,2),(6,3),(12,3),(18,3)；
Antenna a=1：(7,0),(13,0),(19,0),(7,1),(19,1),(13,2),(7,3),(13,3),(19,3).
7. discrete pilot interposition method in OFDM-MIMO communication system as claimed in claim 4, which is characterized in that
Wherein, OFDM symbol sum value is S=5, and subcarrier total number value is C=26,
In such cases,
8. discrete pilot interposition method in OFDM-MIMO communication system as claimed in claim 7, which is characterized in that
Wherein, then the scattered pilot position coordinates of two antennas are as follows：
Antenna a=0：(6,0),(12,0),(18,0),(24,0),(6,1),(18,1),(12,2),(24,2),(6,3),(18,
3),(6,4),(12,4),(18,4),(24,4)；
Antenna a=1：(7,0),(13,0),(19,0),(25,0),(7,1),(19,1),(13,2),(25,2),(7,3),(19,
3),(7,4),(13,4),(19,4),(25,4)。
9. scattered pilot insertion apparatus in a kind of OFDM-MIMO communication system, which is characterized in that including：
Scattered pilot is inserted into module, in the case of being transmitted and received for two antennas, the scattered pilot of two antennas
It is close in a certain range in OFDM frequency domain resource, it is uniform that appropriateness is spaced in time-domain resource.
10. scattered pilot insertion apparatus in OFDM-MIMO communication system as claimed in claim 9, which is characterized in that including：
Wherein, the scattered pilot of two antennas is adjacent, and the scattered pilot interval being inserted into is moderately uniform.
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| CN201710316675.0A CN108880764A (en) | 2017-05-08 | 2017-05-08 | Discrete pilot interposition method and device in OFDM-MIMO communication system |
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| CN201710316675.0A CN108880764A (en) | 2017-05-08 | 2017-05-08 | Discrete pilot interposition method and device in OFDM-MIMO communication system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101076005A (en) * | 2007-06-25 | 2007-11-21 | 北京创毅视讯科技有限公司 | Method for transmitting discrete guide-frequency signal of multi-carrier system |
| US20110216808A1 (en) * | 2001-10-17 | 2011-09-08 | Nortel Networks Limited | Scattered pilot pattern and channel estimation method for mimo-ofdm systems |
| CN102761504A (en) * | 2012-07-10 | 2012-10-31 | 河北工业大学 | Estimation method for TD-LTE digital relay downlink channel |
| CN103036844A (en) * | 2004-03-15 | 2013-04-10 | 北方电讯网络有限公司 | Pilot design for OFDM systems with four transmit antennas |
| US20150055725A1 (en) * | 2008-03-04 | 2015-02-26 | Microsoft Corporation | Pilot Design for Wireless System |
-
2017
- 2017-05-08 CN CN201710316675.0A patent/CN108880764A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110216808A1 (en) * | 2001-10-17 | 2011-09-08 | Nortel Networks Limited | Scattered pilot pattern and channel estimation method for mimo-ofdm systems |
| CN103036844A (en) * | 2004-03-15 | 2013-04-10 | 北方电讯网络有限公司 | Pilot design for OFDM systems with four transmit antennas |
| CN101076005A (en) * | 2007-06-25 | 2007-11-21 | 北京创毅视讯科技有限公司 | Method for transmitting discrete guide-frequency signal of multi-carrier system |
| US20150055725A1 (en) * | 2008-03-04 | 2015-02-26 | Microsoft Corporation | Pilot Design for Wireless System |
| CN102761504A (en) * | 2012-07-10 | 2012-10-31 | 河北工业大学 | Estimation method for TD-LTE digital relay downlink channel |
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