CN108650005A - A kind of pilot configuration and channel estimation methods in MIMO-FBMC/OQAM systems - Google Patents
A kind of pilot configuration and channel estimation methods in MIMO-FBMC/OQAM systems Download PDFInfo
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- CN108650005A CN108650005A CN201810483624.1A CN201810483624A CN108650005A CN 108650005 A CN108650005 A CN 108650005A CN 201810483624 A CN201810483624 A CN 201810483624A CN 108650005 A CN108650005 A CN 108650005A
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/022—Channel estimation of frequency response
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
A kind of pilot configuration and channel estimation methods in MIMO FBMC/OQAM systems.Transmitting antenna number scale is Nt, different antennae is using different pilot frequency sequences, and the pilot frequency sequence of every antenna is by 3NtSection symbol sebolic addressing composition, every section of symbol sebolic addressing length are identical as number of sub carrier wave.By taking the system of a 2x2 as an example, first segment, third section, the 4th section and the 6th section of symbol sebolic addressing are complete 1 symbol sebolic addressing on first root antenna, and second segment and the 5th section of symbol sebolic addressing are 1,1 crossing sequence.On another antenna, for first three section of sequence of pilot symbols as on first antenna, rear three sections of sequence of pilot symbols are opposite with first antenna same position sequence of pilot symbol.The present invention can more effectively eliminate the intersymbol interference caused by multi-path jamming and inter-sub-carrier interference, to improve the channel estimation accuracy of system.Meanwhile the pilot configuration has lower signal peak-to-average power power ratio, reduces linear requirements of the system to high power amplifier.
Description
Technical field
The present invention relates to multi-carrier communication technical fields, are related specifically to channel estimation related field, and in particular to one
Kind is based on the pilot configuration and channel estimation methods in MIMO-FBMC/OQAM systems.
Background technology
Next generation mobile communication technology around how to improve transmission rate and quality in finite bandwidth, pass through by
FBMC/OQAM technologies and MIMO technology be combined be the development of next generation communication technology demand, however, due to FBMC/OQAM
The characteristic (only in real number field strict orthogonal) of technology itself, there are intrinsic imaginary parts to interfere for FBMC/OQAM systems.Wireless channel has
Larger randomness, in order to carry out channel equalization in receiving terminal, it is necessary to obtain accurate channel information.For this
A little mimo system channel estimation methods are to carry out simple extension by the pilot configuration to single-input single-output system to make it mostly
Channel estimation can be completed in conjunction with MIMO technology.
However, in mimo systems, the Pilot Symbol Length after optimization is usually longer than traditional pilot symbol, due to extension
Pilot length so that occur additional imaginary part distracter between frequency pilot sign, these distracters so that channel estimation is accurate
Degree declines, and declines so as to cause the channel estimating performance of mimo system, this has seriously affected channel estimating performance.Therefore, how
Under the conditions of existing for more distracters realize channel high accuracy estimation be MIMO-FBMC/OQAM systems in practical applications
The key technical problem to be faced.
Invention content
The present invention is in order to solve the above technical problems, provide a kind of pilot configuration letter for MIMO-FBMC/OQAM systems
Channel estimation method eliminates the intersymbol interference caused by multi-path jamming and son by being provided based on pilot-based channel estimation method
Inter-carrier interference, to improve the channel estimation accuracy of MIMO-FBMC/OQAM systems.
The present invention is achieved by the following technical solutions.
A kind of pilot configuration based on MIMO-FBMC/OQAM systems of the present invention, it is characterised in that：MIMO-
The integer power time number N that the transmitting antenna number scale of FBMC/OQAM systems is 2t, the pilot frequency sequence of every antenna is by 3NtSection symbol sequence
Row composition, the symbol numbers of every section of symbol sebolic addressing are identical as system subcarrier number.One group of pilot tone symbol is formed by three sections of pilot frequency sequences
Number, this group of frequency pilot sign first segment and third section pilot frequency sequence are complete 1, the crossing sequence that second segment pilot frequency sequence is 1, -1.Root
Corresponding pilot configuration is chosen according to transmitting antenna number.
Further, the Pilot Symbol Length is by transmitting antenna number NtIt determines, fixed group code sequence is three sections
Symbol sebolic addressing forms.
A kind of channel estimation methods for the pilot configuration in MIMO-FBMC/OQAM systems of the present invention, including
Following steps：
(1) all preserve or generate above-mentioned pilot frequency sequence in MIMO-FBMC/OQAM systems transmitting terminal and receiving terminal；
(2) different antennae of MIMO-FBMC/OQAM system receiving terminals receives different data streams signal, according to FBMC/
The processing method of OQAM systems is respectively handled the reception data flow of different antennae；
(3) data flow received from different antennae extracts that transmitting antenna is corresponding to lead after step (2) processing
Frequency signal, specific location of the MIMO-FBMC/OQAM system transmitting terminal known pilot signals in data, receiving terminal are believed from pilot tone
The data that corresponding position is extracted in number obtain the channel response in pilot frequency locations；
(4) channel response in pilot frequency locations is obtained by step (3) processing to different data streams, estimated according to linear interpolation
Meter mode carries out channel estimation to remaining pilot subcarrier positions, to obtain whole letters of each traffic channel estimated sequence
Breath；
(5) channel estimation value obtained using each data flow, receiving terminal is to each data flow received according to FBMC
Demodulation Systems process completes the demodulation of information symbol grade；
(6) data after demodulating step (5) carry out MIMO equilibrium treatments, to compensate multipath channel to sending signal
It influences, the signal after the equilibrium then obtained carries out OQAM demodulation, and the defeated of significant bit information is completed finally by parallel serial conversion
Go out.
Compared with prior art, superiority of the invention is embodied in：The pilot configuration channel estimation methods can be more effective
The intersymbol interference caused by multi-path jamming and inter-sub-carrier interference are eliminated in ground, to improve the letter of MIMO-FBMC/OQAM systems
Road accuracy of estimation.Meanwhile the pilot configuration has lower signal peak-to-average power power ratio, reduces MIMO-FBMC/OQAM systems pair
The linear requirements of high power amplifier, can provide more preferably than traditional classical pilot configuration channel estimation methods the bit error rate and
Square error performance improves the accuracy of channel estimation.
Description of the drawings
Fig. 1 is prior art spatial multiplexing MIMO-FBMC/OQAM system block diagrams.
Fig. 2 is the pilot configuration schematic diagram of the present invention.
Fig. 3 is that the pilot configuration channel estimation methods of the present invention and 4 kinds of traditional pilot structure channel estimation methods exist
BER Simulation comparison diagram under 4 diameter fading channels of Pedestrian A channel.
Fig. 4 is that the pilot configuration channel estimation methods of the present invention and 4 kinds of traditional pilot structure channel estimation methods exist
Mean square error simulation comparison figure under 4 diameter fading channels of Pedestrian A channel.
Fig. 5 is the pilot configuration signal amplitude analogous diagram of the present invention.
Fig. 6 is the signal amplitude analogous diagram of IAM-C pilot configurations.
Fig. 7 is the signal amplitude analogous diagram of E-IAM-C pilot configurations.
Fig. 8 is the signal amplitude analogous diagram of ICM pilot configurations.
Fig. 9 is the signal amplitude analogous diagram of NPS pilot configurations.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is prior art spatial multiplexing MIMO-FBMC/OQAM system block diagrams.Including transmitting terminal and receiving terminal, transmitting terminal
Including serial to parallel conversion, FBMC modulation modules, receiving terminal includes FBMC demodulation modules, MIMO balance modules, OQAM demodulation modules, simultaneously
String transformation, it further includes mimo channel and pilot configuration, and the pilot configuration is corresponded with transmitting antenna number, the hair of the system
The integer power that antenna number is 2 is penetrated, the pilot frequency sequence of every antenna is made of section symbol sebolic addressing, and pilot frequency sequence number is the transmitting
3 times of antenna number, the system have subcarrier, the symbol numbers of every section of symbol sebolic addressing identical as system subcarrier number.
Consider a Nr×Nt(Nr≥Nt) MIMO-FBMC/OQAM systems, by SISO-FBMC/OQAM channels
The extension of demodulated signal expression formula can obtain jth under MIMO-FBMC/OQAM systems (j=1,2 ..., Nr) root reception antenna
On reception signal expression be：
Wherein,For the real-valued signal sent on i-th of antenna of time-frequency lattice point (m, n),For i-th transmission and jth
Channel gain between root reception antenna,For the Gaussian noise introduced on jth root antenna,For FBMC/OQAM systems
Intrinsic distracter：
In formula<gp,q|gm,n>Indicate inner product operation, gp,qAnd gm,nIndicate the subcarrier basic function in different time frequency points.
Matrixing is carried out to formula (1), can obtain at time-frequency lattice point (m, n) receiving signal on reception antenna be：
rm,n=Hm,n(am,n+jum,n)+ηm,n (3)
Wherein,Hm,nFor Nr
×NtChannel frequency domain response matrix, i.e.,：
The equivalent transmission symbolic vector form of MIMO-FBMC/OQAM systems can be expressed as：
cm,n=am,n+jum,n (5)
When transmitting antenna number is 2,1 pilot configuration of antenna is repeated to form by 1 group of frequency pilot sign, 2 pilot configuration of antenna
It is formed by 1 group of frequency pilot sign and with the frequency pilot sign of its contrary sign, the frequency pilot sign group of two antennas may be constructed 2 ranks
Orthogonal matrix
The frequency pilot sign group matrix is a hadamard matrix, and the matrix is by 1 and -1 orthogonal square formation constituted.
For the MIMO-FBMC/OQAM systems of 2x2, can be write out according to formula (3) in time n=2,5 receptions symbol
Number it is：
If Fig. 2 is pilot configuration sequence of the present invention.For the FBMC/OQAM systems with good time-frequency characteristic filter group
For, it interferes essentially from single order field, then the MIMO-FBMC/OQAM systems for using pilot configuration of the present invention, closely
As haveSubstituting into above formula then has：
Wherein, A is a Hadamard orthogonal matrix.
Equivalent frequency pilot sign c in formula (7)mSurvey known quantity can be calculated in advance for one.Channel frequency at subcarrier m
Domain response is just
By above-mentioned analysis, FBMC/OQAM technologies can be easily combined with MIMO so that communication system has simultaneously
The advantages of both standby technologies.
Pilot configuration of the present invention as shown in Figure 2 forms one group of frequency pilot sign by three sections of pilot frequency sequences, this group of frequency pilot sign the
One section is complete 1 with third section pilot frequency sequence, the crossing sequence that second segment pilot frequency sequence is 1, -1.It is chosen according to transmitting antenna number
Corresponding pilot configuration.First segment, third section, the 4th section and the 6th section of symbol sebolic addressing are complete 1 symbol sequence on first root antenna
Row, second segment and the 5th section of symbol sebolic addressing are 1, -1 crossing sequence.On another antenna, first three section of sequence of pilot symbols and first
As on root antenna, rear three sections of sequence of pilot symbols are opposite with first antenna same position sequence of pilot symbol.The pilot tone
Comparison such as table 1 and the table of interfering energy of the structure sequence at third section and the 4th section of pilot frequency symbol position and traditional 2 kinds of methods
2.Pilot configuration sequence proposed by the present invention is similar with NPS with the additional interference energy at the 5th pilot frequency sequence at the 2nd, portion
Divide and is more than IC.In the interference of the 3rd and the 4th pilot frequency sequence, the interference size partly having nothing in common with each other in antenna 1, but in day
In the interference of line 2, the most of interference of pilot configuration sequence of the invention in two symbol sebolic addressings are both less than IC pilot configurations
With NPS pilot configurations, as a result, conclusion can show that it is more excellent.
Additional interference energy comparison at third section and the 4th section of frequency pilot sign at 1 antenna 1 of table
Table 2 is the third section at antenna 2 and the additional interference energy comparison at the 4th section of frequency pilot sign
The present invention can provide the MIMO-FBMC/OQAM signals compared with low peak average ratio, to reduce MIMO-FBMC/OQAM systems
The linear requirements united to high power amplifier.The bit error rate more preferably than traditional classical pilot configuration channel estimation methods can be provided
With mean square error performance, the accuracy of channel estimation is improved, is specifically shown in Fig. 3-Fig. 9, wherein Fig. 3 is pilot configuration channel of the present invention
Method of estimation and 4 kinds of traditional pilot structure channel estimation methods error code under 4 diameter fading channels of Pedestrian A channel
Rate simulation comparison, Fig. 4 are that pilot configuration channel estimation methods of the present invention and 4 kinds of traditional pilot structure channel estimation methods exist
Mean square error simulation comparison figure under 4 diameter fading channels of Pedestrian A channel, Fig. 5-Fig. 9 are pilot configuration of the present invention
With the signal amplitude simulation comparison figure of other 4 kinds of pilot configurations, peak-to-average ratio comparison is shown in Table 3.
The peak to average contrast table of table 3 present invention and other 4 kinds of pilot tones
| IAM-C | E-IAM-C | ICM | NPS | The present invention | |
| Peak-to-average force ratio | 104.81 | 230.91 | 140.09 | 188.41 | 140.1 |
The present invention pilot-based channel estimation method can more effectively eliminate the intersymbol interference caused by multi-path jamming and
Inter-sub-carrier interference, to improve the channel estimation accuracy of MIMO-FBMC/OQAM systems.Meanwhile the pilot configuration have compared with
Low signal peak-to-average power power ratio reduces MIMO-FBMC/OQAM systems to the linear requirements of high power amplifier, can provide ratio
Traditional classical pilot configuration the channel estimation methods more preferably bit error rate and mean square error performance, improve the accuracy of channel estimation.
Claims (3)
1. a kind of pilot configuration based on MIMO-FBMC/OQAM systems, it is characterized in that the transmitting day of MIMO-FBMC/OQAM systems
Line number is denoted as 2 integer power time number Nt, the pilot frequency sequence of every antenna is by 3NtSection symbol sebolic addressing composition, every section of symbol sebolic addressing
Symbol numbers are identical as system subcarrier number；One group of frequency pilot sign, this group of frequency pilot sign first segment are formed by three sections of pilot frequency sequences
It is complete 1 with third section pilot frequency sequence, the crossing sequence that second segment pilot frequency sequence is 1, -1 is chosen corresponding according to transmitting antenna number
Pilot configuration.
2. a kind of pilot configuration based on MIMO-FBMC/OQAM systems according to claim 1, it is characterized in that described lead
Frequency symbol length is by transmitting antenna number NtIt determines, fixed group code sequence is that three sections of symbol sebolic addressings form.
3. a kind of channel estimation methods for the pilot configuration in MIMO-FBMC/OQAM systems described in claim 1,
It is characterized in including the following steps：
(1) all preserve or generate above-mentioned pilot frequency sequence in MIMO-FBMC/OQAM systems transmitting terminal and receiving terminal；
(2) different antennae of MIMO-FBMC/OQAM system receiving terminals receives different data streams signal, according to FBMC/OQAM systems
The processing method of system is respectively handled the reception data flow of different antennae；
(3) data flow received from different antennae extracts the corresponding pilot tone letter of transmitting antenna after step (2) processing
Number, specific location of the MIMO-FBMC/OQAM system transmitting terminal known pilot signals in data, receiving terminal is from pilot signal
The data for extracting corresponding position obtain the channel response in pilot frequency locations；
(4) channel response in pilot frequency locations is obtained by step (3) processing to different data streams, according to linear interpolation estimation side
Formula carries out channel estimation to remaining pilot subcarrier positions, to obtain all information of each traffic channel estimated sequence；
(5) channel estimation value obtained using each data flow, receiving terminal is to each data flow received according to FBMC systems
Demodulating process completes the demodulation of information symbol grade；
(6) data after demodulating step (5) carry out MIMO equilibrium treatments, to compensate shadow of the multipath channel to transmission signal
It rings, the signal after the equilibrium then obtained carries out OQAM demodulation, and the output of significant bit information is completed finally by parallel serial conversion.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450827A (en) * | 2018-10-30 | 2019-03-08 | 武汉邮电科学研究院有限公司 | Channel estimation methods and system based on next-generation wireless waveform FBMC-OQAM |
| CN113347121A (en) * | 2021-05-14 | 2021-09-03 | 华中科技大学 | Channel estimation method and system based on multi-carrier system pilot frequency optimization design |
| CN114884792A (en) * | 2022-05-27 | 2022-08-09 | 华中科技大学 | High-precision multi-carrier symbol rapid recovery method, device and system |
| CN115001922A (en) * | 2022-05-27 | 2022-09-02 | 华中科技大学 | Method, device and system for quickly recovering multi-carrier symbols with low pilot frequency overhead |
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| CN109450827A (en) * | 2018-10-30 | 2019-03-08 | 武汉邮电科学研究院有限公司 | Channel estimation methods and system based on next-generation wireless waveform FBMC-OQAM |
| CN113347121A (en) * | 2021-05-14 | 2021-09-03 | 华中科技大学 | Channel estimation method and system based on multi-carrier system pilot frequency optimization design |
| CN113347121B (en) * | 2021-05-14 | 2022-05-20 | 华中科技大学 | Channel estimation method and system based on multi-carrier system pilot frequency optimization design |
| CN114884792A (en) * | 2022-05-27 | 2022-08-09 | 华中科技大学 | High-precision multi-carrier symbol rapid recovery method, device and system |
| CN115001922A (en) * | 2022-05-27 | 2022-09-02 | 华中科技大学 | Method, device and system for quickly recovering multi-carrier symbols with low pilot frequency overhead |
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