CN105284087B - A kind of channel estimation methods and device, equipment - Google Patents
A kind of channel estimation methods and device, equipment Download PDFInfo
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- CN105284087B CN105284087B CN201380077330.4A CN201380077330A CN105284087B CN 105284087 B CN105284087 B CN 105284087B CN 201380077330 A CN201380077330 A CN 201380077330A CN 105284087 B CN105284087 B CN 105284087B
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- 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
- H04L25/0204—Channel estimation of multiple channels
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- 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
- H04L25/0224—Channel estimation using sounding signals
Abstract
A kind of channel estimation methods and device, equipment.Method therein includes: to obtain the reception signal for being used for channel estimation, and the signal that receives is signal of the pilot frequency sequence with out of phase deviant that sends in same system resource of at least one user equipment after channel；For all user equipmenies for sending pilot tone using same system resource, the channel estimation of iteration at least once is carried out to the reception signal；Export the channel estimation results of all user equipmenies that pilot tone is sent using same system resource.Also disclose corresponding device and equipment.Using the technical solution of a kind of channel estimation methods of the invention and device, equipment, establish on the basis of known pilot signal, and channel is unknown, it is not related to the encoding and decoding of data-signal, the interference between multiple signals of same frequency can be reduced, the precision of channel estimation is improved, channel estimation process is simple.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of channel estimation methods and device, equipment.
Background technique
Sounding Reference Signal is utilized in time division duplex (Time Division Duplexing, TDD) system
(Sounding Reference Signaling, SRS) carries out channel estimation, and the SRS of different user devices uses different circulations
ZC (Zadoff-Chu) sequence of offset, the circulation offset of sequence is in the time domain.In LTE system, each sequence could support up 8
A different circulation deviant.The last one orthogonal frequency division multiplexing (Orthogonal of the SRS sequence in sub-frame of uplink
Frequency Division Multiplexing, OFDM) it is sent every a subcarrier on symbol (symbol), that is,
It says, the SRS of most 8 user equipmenies is same sequence plus the sequence after different offsets.These SRS are sent in same symbol
Same sub-carrier on, the circulation of time domain deviates the different phase offsets of sequence on corresponding frequency domain.Realize that the multi-user of SRS sets
The reception signal of frequency domain inherently because when the receiving end of SRS carries out channel estimation, is passed through discrete Fu by standby multiplexing
In leaf inverse transformation (Inverse Discrete Fourier Transform, IDFT) be transformed into time domain so that plus not
The corresponding channel of user equipment of same-phase offset has different circulation offsets, and then separates the channel of multi-user installation.
The current existing channel estimation side SRS suitable for long term evolution (Long Term Evolution, LTE) system
Fado is Parallel channel estimation, that is, the multi-user installation separation scheme of the above-mentioned signal for transforming to time domain.But
In view of SRS is that one subcarrier in interval is sent, the corresponding channel power delay profile (Power of each user equipment at this time
Delay Profile, PDP) it is distributed on all IDFT points, therefore interfered between multi-user installation very big.And it is more in multi-user
It inputs in multi output (Multi-User Multi-Input Multi-Output, MU-MIMO), users multiplexing number of devices increases
When, the error of SRS channel estimation has very big influence for performance.It is especially considering that in future communication systems, base station side day
Line, which increases, is widely recognized as a feasible direction, thus the user device quantity that base station can service simultaneously generally can be tens
The order of magnitude, the channel estimation errors of SRS can bring sizable performance to influence at this time, improve the precision of SRS channel estimation just
Become extremely urgent.
It can be brought very greatly it can be seen from the narration of front since the PDP of subscriber channel is distributed on all IDFT points
Multiuser interference, the precision of channel estimation can be then correspondingly improved by reducing multiuser interference.Disappear for the interference of data
It except scheme is generally built upon known to channel and in the data basis being correctly decoded, then is encoded, thus receiving signal
The data correctly estimated are subtracted in initial data, are interfered so that the partial data will not decode subsequent data.
Summary of the invention
The embodiment of the invention provides a kind of channel estimation methods and devices, equipment, can reduce multiple signals of same frequency
Between interference, improve the precision of channel estimation.
In a first aspect, providing a kind of channel estimation methods, comprising:
The reception signal for being used for channel estimation is obtained, the reception signal is that at least one user equipment is provided in same system
Signal of the pilot frequency sequence with out of phase deviant sent on source after channel；
For all user equipmenies for sending pilot tone using same system resource, the reception signal is carried out at least once
The channel estimation of iteration；
Export the channel estimation results of all user equipmenies that pilot tone is sent using same system resource.
In the first possible implementation, described to be set for all users for sending pilot tone using same system resource
It is standby, the channel estimation of iteration at least once is carried out to the reception signal, specifically:
It is corresponding according to all user equipmenies for sending pilot tone using same system resource in the channel estimation of each iteration
Pilot frequency sequence setting sequence, for it is all using same system resource send pilot tone user equipmenies, to receptions letter
Number carry out serial channel estimation；Alternatively,
It is right for all user equipmenies for sending pilot tone using same system resource in the channel estimation of each iteration
The reception signal carries out Parallel channel estimation.
The possible implementation of with reference to first aspect the first, it is in the second possible implementation, described every
In the channel estimation of secondary iteration, according to all corresponding pilot frequency sequences of user equipment for sending pilot tone using same system resource
Setting sequence carries out serially the reception signal for all user equipmenies for being sent pilot tone using same system resource
Channel estimation, comprising:
In the channel estimation of each iteration, according to the setting sequence, successively eliminate according to its for receiving signal
It has estimated the interference signal that channel is accumulated by using the user equipment that same system resource sends pilot tone, obtains current use
The channel estimation results of family equipment；
The corresponding interference signal of the channel estimation results of the current user equipment is added to and described has estimated that channel tires out
Obtained interference signal is counted, and is repeated the above steps until obtaining all users for sending pilot tone using same system resource
The channel estimation results of equipment.
Second of possible implementation of the possible implementation of with reference to first aspect the first or first aspect,
In the third possible implementation, the setting sequence is that all users for sending pilot tone using same system resource set
The sequence of the Signal to Interference plus Noise Ratio of standby corresponding pilot frequency sequence.
The possible implementation of with reference to first aspect the first, it is in the fourth possible implementation, described every
In the channel estimation of secondary iteration, for all user equipmenies for sending pilot tone using same system resource, to the reception signal
Parallel channel estimation is carried out, specifically:
In the channel estimation of each iteration, in all user equipmenies for sending pilot tone using same system resource
Each user equipment is eliminated and has been estimated according to the other user equipmenies for sending pilot tone using same system resource for receiving signal
The interference signal that meter channel is accumulated by, obtains the channel estimation results of each user equipment.
Second aspect provides a kind of channel estimating apparatus, comprising:
Acquiring unit, for obtaining the reception signal for being used for channel estimation, the reception signal is that at least one user sets
Signal of the standby pilot frequency sequence with out of phase deviant sent in same system resource after channel；
Channel estimating unit, for being connect to described for all user equipmenies for sending pilot tone using same system resource
The collection of letters number carries out a channel estimation for iteration at least once；
Output unit, for exporting the channel estimation for exporting all user equipmenies for sending pilot tone using same system resource
As a result.
In the first possible implementation, the channel estimating unit is specifically used for the channel estimation in each iteration
In, according to the setting sequence of all corresponding pilot frequency sequences of user equipment for sending pilot tone using same system resource, for institute
There is the user equipment for sending pilot tone using same system resource, serial channel estimation is carried out to the reception signal；Alternatively,
The channel estimating unit is specifically used in the channel estimation of each iteration, is provided for all using same system
Source sends the user equipment of pilot tone, carries out Parallel channel estimation to the reception signal.
In conjunction with the first possible implementation of second aspect, in the second possible implementation, the channel
Estimation unit includes:
Obtaining unit, for according to the setting sequence, successively eliminating according in the channel estimation of each iteration
The other user equipmenies for sending pilot tone using same system resource for receiving signal have estimated that the interference that channel is accumulated by is believed
Number, obtain the channel estimation results of current user equipment；
Summing elements, it is described for the corresponding interference signal of the channel estimation results of the current user equipment to be added to
The interference signal that channel is accumulated by is estimated.
In conjunction with the first possible implementation of second aspect or second of possible implementation of second aspect,
In the third possible implementation, the setting sequence is that all users for sending pilot tone using same system resource set
The sequence of the Signal to Interference plus Noise Ratio of standby corresponding pilot frequency sequence.
In conjunction with the first possible implementation of second aspect, in the fourth possible implementation, the channel
Estimation unit is specifically used in the channel estimation of each iteration, for all users for sending pilot tone using same system resource
Each user equipment in equipment is eliminated according to the other users for being sent pilot tone using same system resource for receiving signal
Equipment has estimated the interference signal that channel is accumulated by, and obtains the channel estimation results of each user equipment.
The third aspect provides a kind of channel estimating apparatus, including input unit, output device, memory and processor；
Wherein, the processor is for executing following steps:
The reception signal for being used for channel estimation is obtained, the reception signal is that at least one user equipment is provided in same system
Signal of the pilot frequency sequence with out of phase deviant sent on source after channel；
For all user equipmenies for sending pilot tone using same system resource, the reception signal is carried out at least once
The channel estimation of iteration；
Export the channel estimation results of all user equipmenies that pilot tone is sent using same system resource.
In the first possible implementation, the processor execution is described is sent out for all using same system resource
The user equipment for sending pilot tone, to the reception signal carry out at least once the channel estimation of iteration the step of, specifically:
It is corresponding according to all user equipmenies for sending pilot tone using same system resource in the channel estimation of each iteration
Pilot frequency sequence setting sequence, for it is all using same system resource send pilot tone user equipmenies, to receptions letter
Number carry out serial channel estimation；Alternatively,
It is right for all user equipmenies for sending pilot tone using same system resource in the channel estimation of each iteration
The reception signal carries out Parallel channel estimation.
In conjunction with the first possible implementation of the third aspect, in the second possible implementation, the processing
Device execution is described in the channel estimation of each iteration, according to all user equipmenies pair for sending pilot tone using same system resource
The setting sequence for the pilot frequency sequence answered, for all user equipmenies for sending pilot tone using same system resource, to the reception
Signal carries out the step of serial channel estimation, comprising:
In the channel estimation of each iteration, according to the setting sequence, successively eliminate according to its for receiving signal
It has estimated the interference signal that channel is accumulated by using the user equipment that same system resource sends pilot tone, obtains current use
The channel estimation results of family equipment；
The corresponding interference signal of the channel estimation results of the current user equipment is added to and described has estimated that channel tires out
Obtained interference signal is counted, and is repeated the above steps until obtaining all users for sending pilot tone using same system resource
The channel estimation results of equipment.
In conjunction with the first possible implementation of the third aspect or second of possible implementation of the third aspect,
In the third possible implementation, the setting sequence is that all users for sending pilot tone using same system resource set
The sequence of the Signal to Interference plus Noise Ratio of standby corresponding pilot frequency sequence.
In conjunction with the first possible implementation of the third aspect, in the fourth possible implementation, the processing
Device execute it is described in the channel estimation of each iteration, for all user equipmenies for sending pilot tone using same system resource,
The step of Parallel channel estimation is carried out to the reception signal, specifically:
In the channel estimation of each iteration, in all user equipmenies for sending pilot tone using same system resource
Each user equipment is eliminated and has been estimated according to the other user equipmenies for sending pilot tone using same system resource for receiving signal
The interference signal that meter channel is accumulated by, obtains the channel estimation results of each user equipment.
Using the technical solution of a kind of channel estimation methods of the invention and device, equipment, establish in known pilot signal
On the basis of, and channel is unknown, is not related to the encoding and decoding of data-signal, can reduce the interference between multiple signals of same frequency, mentions
The precision of high channel estimation, channel estimation process are simple.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of flow chart of channel estimation methods provided in an embodiment of the present invention；
Fig. 2 is another further refined to a kind of channel estimation methods provided in an embodiment of the present invention shown in FIG. 1
The flow chart of embodiment；
Fig. 3 is another further refined to a kind of channel estimation methods provided in an embodiment of the present invention shown in FIG. 1
The flow chart of embodiment；
Fig. 4 is a kind of structural schematic diagram of channel estimating apparatus provided in an embodiment of the present invention；
Fig. 5 is another further refined to a kind of channel estimating apparatus provided in an embodiment of the present invention shown in Fig. 4
The structural schematic diagram of embodiment；
Fig. 6 is another further refined to a kind of channel estimating apparatus provided in an embodiment of the present invention shown in Fig. 4
The structural schematic diagram of embodiment；
Fig. 7 is a kind of structural schematic diagram of channel estimating apparatus provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of flow chart of channel estimation methods provided in an embodiment of the present invention.As shown in Figure 1, this method includes
Following steps:
Step S101, obtains the reception signal for being used for channel estimation, and the reception signal is that at least one user equipment exists
Signal of the pilot frequency sequence with out of phase deviant sent in same system resource after channel.
Embodiment in the present invention, the pilot frequency sequence of multiple user equipmenies such as SRS are sent on same pilot frequency sequence, example
Such as, the SRS of different user devices uses Zadoff-Chu sequence, can be at most that same sequence is added with the SRS of 8 user equipmenies
Different deviants.The length of SRS sequence is usually 12 multiple, and each element of sequence needs a resource unit
(Resource Element, RE) is sent, and an OFDM symbol is generally made of many subcarriers, each OFDM
The subcarrier of symbol is RE, and same pilot frequency sequence is sent in the same sub-carrier of same OFDM symbol, therefore, base
The reception signal for channel estimation that station receives has difference for what multiple user equipmenies were sent in same system resource
Frequency-region signal of the pilot frequency sequence of phase pushing figure after channel adds up.
Step S102, for it is all using same system resource send pilot tone user equipmenies, to the reception signal into
The channel estimation of capable iteration at least once.
Signal of the pilot frequency sequence with out of phase deviant sent using same system resource after channel is deposited
In mutual interference, the purpose for carrying out channel estimation is set for all users for sending pilot tone using same system resource
It is standby, it is other in elimination reception signal to send the corresponding reception signals of user equipment of pilot tone to the reception using same system resource
It is interfered caused by signal.An iteration is to be directed to all user equipmenies that pilot tone is sent using same system resource, is completed in phase
The channel estimation of signal of the pilot frequency sequence with out of phase deviant sent in homologous ray resource after channel, passes through
Successive ignition further accurately obtains all corresponding reception signals of user equipment that pilot tone is sent using same system resource
Interference signal.For all user equipmenies for sending pilot tone using same system resource, to receiving, signal progress is primary or more
The channel estimation of secondary iteration, the number of iterations is more, and precision of channel estimation is higher, in practical operation, can comprehensively consider channel estimation
The number of permissible accuracy and channel estimation process duration selection iteration.
Step S103 exports the channel estimation results of all user equipmenies that pilot tone is sent using same system resource.
Each channel by channel estimation, the as channel estimation results are obtained from the reception signal for eliminating interference.
The channel estimation results can be for all user equipmenies for being sent pilot tone using same system resource, complete to signal is received
Channel estimation results after entire iteration.
The process of above-mentioned carry out channel estimation, on the basis of known pilot signal, and channel is unknown, is not related to data-signal
Encoding and decoding the precision of channel estimation, channel estimation can be improved by iteration elimination with the interference between multiple signals of frequency
Process is simple.
A kind of channel estimation methods provided according to embodiments of the present invention are established on the basis of known pilot signal, and are believed
Road is unknown, is not related to the encoding and decoding of data-signal, and channel estimation process is simple, can reduce dry between multiple signals of same frequency
It disturbs, improves the precision of channel estimation.
Fig. 2 is another further refined to a kind of channel estimation methods provided in an embodiment of the present invention shown in FIG. 1
The flow chart of embodiment.As shown in Fig. 2, method includes the following steps:
Step S201, obtains the reception signal for being used for channel estimation, and the reception signal is that at least one user equipment exists
Signal of the pilot frequency sequence with out of phase deviant sent in same system resource after channel.
Step S201 is identical as the step S101 of previous embodiment, and details are not described herein.
Step S202, according to the setting sequence, is successively eliminated according to the reception in the channel estimation of each iteration
Other user equipmenies for sending pilot tone using same system resource of signal have estimated the interference signal that channel is accumulated by, and obtain
Obtain the channel estimation results of current user equipment.
The corresponding interference signal of the channel estimation results of the current user equipment is added to and described has estimated by step S203
The interference signal that meter channel is accumulated by, and repeat the above steps and led until obtaining all send using same system resource
The channel estimation results of the user equipment of frequency.
Step S202 to step S203 is for all user equipmenies for sending pilot tone using same system resource, to described
Receive the process that signal carries out the channel estimation of iteration at least once, it is specific in the channel estimation of each iteration, according to
The setting sequence of all corresponding pilot frequency sequences of user equipment that pilot tone is sent using same system resource uses phase for all
Homologous ray resource sends the user equipment of pilot tone, and the process of serial channel estimation is carried out to the reception signal.
The process of serial channel estimation successively uses same system to for all i.e. in the channel estimation of each iteration
The corresponding reception signal of user equipment that resource sends pilot tone carries out channel estimation.
Firstly, determining that all user equipmenies for sending pilot tone using same system resource carry out setting for serial channel estimation
Fixed sequence, the present invention are paid the utmost attention to according to the corresponding letter for receiving signal of user equipment for using same system resource to send pilot tone
Number with the sequence of interference plus noise ratio (Signal to Interference plus Noise Ratio, SINR), i.e., estimate first
Count the highest corresponding user equipment of the corresponding reception signal of user equipment for sending pilot tone using same system resource of SINR
Channel, the then sequence according to SINR from high to low, the channel of the other user equipmenies of estimation of the order.Certainly, setting sequence is gone back
It can randomly select.It is worth noting that the present invention, which pays the utmost attention to be directed to, each sends pilot tone in same system resource
User equipment it is corresponding receive signal interference calculation can also have to eliminate interference every m (m is natural number, m > 1)
A corresponding interference calculation for receiving signal of user equipment that pilot tone is sent in same system resource, every m in same system
The corresponding interference for receiving the interference that signal is eliminated and being calculated for before of user equipment of pilot tone is sent in resource.
Then, it receives signal Y1 if iteration for the first time for the current user equipment determined according to setting sequence and subtracts
The interference signal E for having estimated channel and being accumulated by of other user equipmenies that pilot tone is sent in same system resource, obtains
Signal Y2 after eliminating interference, initializes E=0 for the first time when iteration, then the channel estimation that current user equipment current iteration obtains
As a result hi=Y2/Si, Si are pilot frequency sequence, herein, other to have sent the user equipment of pilot tone in same system resource
The interference signal that is accumulated by of estimation channel is i.e.: having carried out before current user equipment carries out channel estimation according to setting sequence
Other the sum of interference signals of user equipment that pilot tone is sent in same system resource of channel estimation；If not changing for the first time
In generation, then the channel of estimation of other user equipmenies that pilot tone is sent in same system resource on same pilot frequency sequence adds up
To interference signal i.e.: the estimated disturbance signal of update subtracts the interference signal that current user equipment last iteration obtains,
Other calculating process are identical.
Finally, the interference signal after current user equipment progress channel estimation is added to the interference signal for having estimated channel,
Estimated disturbance signal is updated.
It repeats the above steps and sends the user equipment progress channel estimation of pilot tone in same system resource to all.
By carrying out serial channel estimation, the channel estimation of each iteration, the interference signal that each pilot signal estimates
It all adds up, so that channel estimation results are more accurate.
Step S204 exports the channel estimation results of all user equipmenies that pilot tone is sent using same system resource.
Each channel by channel estimation, the as channel estimation results are obtained from the reception signal for eliminating interference.
The channel estimation results can be for all user equipmenies for being sent pilot tone using same system resource, complete to signal is received
Channel estimation results after entire iteration.
The process of above-mentioned carry out channel estimation, on the basis of known pilot signal, and channel is unknown, is not related to data-signal
Encoding and decoding, by iteration elimination with the interference between multiple signals of frequency, channel estimation process is simple, and channel can be improved and estimate
The precision of meter.
A kind of channel estimation methods provided according to embodiments of the present invention are established on the basis of known pilot signal, and are believed
Road is unknown, is not related to the encoding and decoding of data-signal, can reduce the interference between multiple signals of same frequency, improve channel estimation
Precision, channel estimation process are simple；And serial channel estimation is carried out so that the precision of channel estimation is higher.
Fig. 3 is another further refined to a kind of channel estimation methods provided in an embodiment of the present invention shown in FIG. 1
The flow chart of embodiment.As shown in figure 3, method includes the following steps:
Step S301, obtains the reception signal for being used for channel estimation, and the reception signal is that at least one user equipment exists
Signal of the pilot frequency sequence with out of phase deviant sent in same system resource after channel.
Step S301 is identical as the step S101 of above-described embodiment or step S201, and details are not described herein.
Step S302, in the channel estimation of each iteration, for all use for sending pilot tone using same system resource
Each user equipment in the equipment of family is eliminated according to the other use for being sent pilot tone using same system resource for receiving signal
Family equipment has estimated the interference signal that channel is accumulated by, and obtains the channel estimation results of each user equipment.
Step S302 be for it is all using same system resource send pilot tone user equipmenies, to the reception signal into
The process of the capable channel estimation of iteration at least once, specific is to use phase for all in the channel estimation of each iteration
Homologous ray resource sends the user equipment of pilot tone, carries out Parallel channel estimation to the reception signal.
The process of Parallel channel estimation in the channel estimation of each iteration, i.e., is sent out in same system resource each
The user equipment of pilot tone is sent to carry out Parallel channel estimation, each user equipment for sending pilot tone in same system resource carries out letter
Other users that pilot tone is sent in same system resource that the interference signal that road is estimated only calculates next iteration set
In standby channel estimation, the channel without other user equipmenies for sending pilot tone in same system resource to current iteration is estimated
Meter has an impact.That is: the user equipment for sending pilot tone in same system resource for all, if iteration for the first time, initialization
Interference signal E=0, at this time to reception signal Y1 without operation, channel estimation results of the current iteration for reception signal Y1
It is pilot frequency sequence for Y1/Si, Si；If not iteration, then the signal Y2 after eliminating interference subtract one to receive signal Y1 for the first time
The other user equipmenies that pilot tone is sent in same system resource of secondary iteration have estimated the interference signal E that channel is accumulated by,
Current iteration is Y2/Si for the channel estimation results of pilot signal Y1.
Step S303 exports the channel estimation results of all user equipmenies that pilot tone is sent using same system resource.
Step S303 is identical as the step S103 of above-described embodiment or step S204, and details are not described herein.
A kind of channel estimation methods provided according to embodiments of the present invention are established on the basis of known pilot signal, and are believed
Road is unknown, is not related to the encoding and decoding of data-signal, can reduce the interference between multiple signals of same frequency, improve channel estimation
Precision, channel estimation process are simple.
Fig. 4 is a kind of structural schematic diagram of channel estimating apparatus provided in an embodiment of the present invention.As shown in figure 4, the device
1000 include:
Acquiring unit 11, for obtaining the reception signal for being used for channel estimation, the reception signal is at least one user
Signal of the pilot frequency sequence with out of phase deviant that equipment is sent in same system resource after channel.
Embodiment in the present invention, the pilot frequency sequence of multiple user equipmenies such as SRS are sent on same pilot frequency sequence, example
Such as, the SRS of different user devices uses Zadoff-Chu sequence, can be at most that same sequence is added with the SRS of 8 user equipmenies
Different deviants.The length of SRS sequence is usually 12 multiple, and each element of sequence needs a resource unit
(Resource Element, RE) is sent, and an OFDM symbol is generally made of many subcarriers, each OFDM
The subcarrier of symbol is RE, and same pilot frequency sequence is sent in the same sub-carrier of same OFDM symbol, therefore, is obtained
The reception signal for channel estimation for taking unit 11 to obtain has for what multiple user equipmenies were sent in same system resource
Frequency-region signal of the pilot frequency sequence of out of phase deviant after channel adds up.
Channel estimating unit 12, for being directed to all user equipmenies for sending pilot tone using same system resource, to described
Receive the channel estimation that signal carries out iteration at least once.
Signal of the pilot frequency sequence with out of phase deviant sent using same system resource after channel is deposited
In mutual interference, the purpose for carrying out channel estimation is set for all users for sending pilot tone using same system resource
It is standby, it is other in elimination reception signal to send the corresponding reception signals of user equipment of pilot tone to the reception using same system resource
It is interfered caused by signal.12 an iteration of channel estimating unit is to be directed to all users that pilot tone is sent using same system resource
Equipment, signal of the pilot frequency sequence with out of phase deviant for completing to send in same system resource after channel
Channel estimation further accurately obtains all user equipmenies pair that pilot tone is sent using same system resource by successive ignition
The interference signal for the reception signal answered.For all user equipmenies for sending pilot tone using same system resource, to reception signal
The channel estimation of one or many iteration is carried out, the number of iterations is more, and precision of channel estimation is higher, in practical operation, can integrate
Consider the number of channel estimation permissible accuracy and channel estimation process duration selection iteration.Output unit 13, it is defeated for exporting
The channel estimation results of all user equipmenies that pilot tone is sent using same system resource out.
Each channel by channel estimation, the as channel estimation results are obtained from the reception signal for eliminating interference.
The channel estimation results can be for all user equipmenies for being sent pilot tone using same system resource, complete to signal is received
Channel estimation results after entire iteration.
The channel estimation that above-mentioned each functional unit is completed, on the basis of known pilot signal, and channel is unknown, is not related to
The precision of channel estimation can be improved by iteration elimination with the interference between multiple signals of frequency in the encoding and decoding of data-signal,
Channel estimation process is simple.
A kind of channel estimating apparatus provided according to embodiments of the present invention is established on the basis of known pilot signal, and is believed
Road is unknown, is not related to the encoding and decoding of data-signal, and channel estimation process is simple, can reduce dry between multiple signals of same frequency
It disturbs, improves the precision of channel estimation.
Fig. 5 is another further refined to a kind of channel estimating apparatus provided in an embodiment of the present invention shown in Fig. 4
The structural schematic diagram of embodiment.As shown in figure 5, the device 2000 includes:
Acquiring unit 21, for obtaining the reception signal for being used for channel estimation, the reception signal is at least one user
Signal of the pilot frequency sequence with out of phase deviant that equipment is sent in same system resource after channel.
The function of acquiring unit 21 is identical as the function of acquiring unit 11 of previous embodiment, and details are not described herein.
Channel estimating unit 22, for being directed to all user equipmenies for sending pilot tone using same system resource, to described
Receive the channel estimation that signal carries out iteration at least once.
In the present embodiment, channel estimating unit 22 is specifically used in the channel estimation of each iteration, makes according to all
The setting sequence that the corresponding pilot frequency sequence of user equipment of pilot tone is sent with same system resource uses same system for all
Resource sends the user equipment of pilot tone, carries out serial channel estimation to the reception signal.
Specifically, which includes: obtaining unit 221 and summing elements 222.
Obtaining unit 221, for according to the setting sequence, successively eliminating basis in the channel estimation of each iteration
The other user equipmenies for sending pilot tone using same system resource for receiving signal have estimated that channel is accumulated by dry
Signal is disturbed, the channel estimation results of current user equipment are obtained.
The process of serial channel estimation successively uses same system to for all i.e. in the channel estimation of each iteration
The corresponding reception signal of user equipment that resource sends pilot tone carries out channel estimation.
Firstly, determining that all user equipmenies for sending pilot tone using same system resource carry out setting for serial channel estimation
Fixed sequence, the present invention are paid the utmost attention to according to the corresponding letter for receiving signal of user equipment for using same system resource to send pilot tone
Number with the sequence of interference plus noise ratio (Signal to Interference plus Noise Ratio, SINR), i.e., estimate first
Count the highest corresponding user equipment of the corresponding reception signal of user equipment for sending pilot tone using same system resource of SINR
Channel, the then sequence according to SINR from high to low, the channel of the other user equipmenies of estimation of the order.Certainly, setting sequence is gone back
It can randomly select.It is worth noting that the present invention, which pays the utmost attention to be directed to, each sends pilot tone in same system resource
User equipment it is corresponding receive signal interference calculation can also have to eliminate interference every m (m is natural number, m > 1)
A corresponding interference calculation for receiving signal of user equipment that pilot tone is sent in same system resource, every m in same system
The corresponding interference for receiving the interference that signal is eliminated and being calculated for before of user equipment of pilot tone is sent in resource.
Then, it receives signal Y1 if iteration for the first time for the current user equipment determined according to setting sequence and subtracts
The interference signal E for having estimated channel and being accumulated by of other user equipmenies that pilot tone is sent in same system resource, obtains
Signal Y2 after eliminating interference, initializes E=0 for the first time when iteration, then the channel estimation that current user equipment current iteration obtains
As a result hi=Y2/Si, Si are pilot frequency sequence, herein, other to have sent the user equipment of pilot tone in same system resource
The interference signal that is accumulated by of estimation channel is i.e.: having carried out before current user equipment carries out channel estimation according to setting sequence
Other the sum of interference signals of user equipment that pilot tone is sent in same system resource of channel estimation；If not changing for the first time
In generation, then the channel of estimation of other user equipmenies that pilot tone is sent in same system resource on same pilot frequency sequence adds up
To interference signal i.e.: the estimated disturbance signal of update subtracts the interference signal that current user equipment last iteration obtains,
Other calculating process are identical.
Summing elements 222, for the corresponding interference signal of the channel estimation results of the current user equipment to be added to
The interference signal having estimated channel and being accumulated by.
Interference signal after current user equipment progress channel estimation is added to by summing elements 222 has estimated the dry of channel
Signal is disturbed, estimated disturbance signal is updated.
The letter for the user equipment for sending pilot tone in same system resource to all is completed by the channel estimating unit 22
Road estimation.
By carrying out serial channel estimation, the channel estimation of each iteration is all to send pilot tone in same system resource
The interference signal that estimates of user equipment all add up so that channel estimation results are more accurate.
Output unit 23, the channel for exporting all user equipmenies for being sent pilot tone using same system resource of output are estimated
Count result.
Each channel by channel estimation, the as channel estimation results are obtained from the reception signal for eliminating interference.
The channel estimation results can be to all user equipmenies for being sent pilot tone using same system resource, and to receiving, signal completion is whole
Channel estimation results after a iteration.
The process of above-mentioned carry out channel estimation, on the basis of known pilot signal, and channel is unknown, is not related to data-signal
Encoding and decoding, by iteration elimination with the interference between multiple signals of frequency, channel estimation process is simple, and channel can be improved and estimate
The precision of meter.
A kind of channel estimating apparatus provided according to embodiments of the present invention is established on the basis of known pilot signal, and is believed
Road is unknown, is not related to the encoding and decoding of data-signal, can reduce the interference between multiple signals of same frequency, improve channel estimation
Precision, channel estimation process are simple；And serial channel estimation is carried out so that the precision of channel estimation is higher.
Fig. 6 is another further refined to a kind of channel estimating apparatus provided in an embodiment of the present invention shown in Fig. 4
The structural schematic diagram of embodiment.As shown in fig. 6, the device 3000 includes:
Acquiring unit 31, for obtaining the reception signal for being used for channel estimation, the reception signal is at least one user
Signal of the pilot frequency sequence with out of phase deviant that equipment is sent in same system resource after channel.
The function of acquiring unit 31 is identical as the function of the acquiring unit 11 of above-described embodiment or acquiring unit 21, herein not
It repeats again.
Channel estimating unit 32, for being directed to all user equipmenies for sending pilot tone using same system resource, to described
Receive the channel estimation that signal carries out iteration at least once.
In the present embodiment, channel estimating unit 32 is specifically used in the channel estimation of each iteration, makes for all
The user equipment that pilot tone is sent with same system resource carries out Parallel channel estimation to the reception signal.
Specifically, channel estimating unit 32 is used in the channel estimation of each iteration, uses same system for all
Resource sends each user equipment in the user equipment of pilot tone, eliminates and uses same system according to the other of reception signal
The user equipment that resource sends pilot tone has estimated the interference signal that channel is accumulated by, and obtains the letter of each user equipment
Road estimated result.
The process of Parallel channel estimation in the channel estimation of each iteration, i.e., is sent out in same system resource each
The user equipment of pilot tone is sent to carry out Parallel channel estimation, each user equipment for sending pilot tone in same system resource carries out letter
Other users that pilot tone is sent in same system resource that the interference signal that road is estimated only calculates next iteration set
In standby channel estimation, the channel without other user equipmenies for sending pilot tone in same system resource to current iteration is estimated
Meter has an impact.That is: the user equipment for sending pilot tone in same system resource for all, if iteration for the first time, initialization
Interference signal E=0, at this time to reception signal Y1 without operation, channel estimation results of the current iteration for reception signal Y1
It is pilot frequency sequence for Y1/Si, Si；If not iteration, then the signal Y2 after eliminating interference subtract one to receive signal Y1 for the first time
The other user equipmenies that pilot tone is sent in same system resource of secondary iteration have estimated the interference signal E that channel is accumulated by,
Current iteration is Y2/Si for the channel estimation results of pilot signal Y1.
Output unit 33, the channel for exporting all user equipmenies for being sent pilot tone using same system resource of output are estimated
Count result.
The function of output unit 33 is identical as the function of the output unit 13 of above-described embodiment or output unit 23, herein not
It repeats again.
A kind of channel estimating apparatus provided according to embodiments of the present invention is established on the basis of known pilot signal, and is believed
Road is unknown, is not related to the encoding and decoding of data-signal, can reduce the interference between multiple signals of same frequency, improve channel estimation
Precision, channel estimation process are simple.
Fig. 7 is a kind of structural schematic diagram of channel estimating apparatus provided in an embodiment of the present invention.As shown in fig. 7, the equipment
4000 can include:
(quantity of the processor 44 in the network equipment can for input unit 41, output device 42, memory 43 and processor 44
It with one or more, is taken a processor as an example in Fig. 7).In some embodiments of the invention, input unit 41, output dress
Setting 42, memory 43 and processor 44 can be connected by bus or other means, wherein in Fig. 7 for being connected by bus.
Wherein, processor 44 is for executing following steps:
The reception signal for being used for channel estimation is obtained, the reception signal is that at least one user equipment is provided in same system
Signal of the pilot frequency sequence with out of phase deviant sent on source after channel；
For all user equipmenies for sending pilot tone using same system resource, the reception signal is carried out at least once
The channel estimation of iteration；
Export the channel estimation results of all user equipmenies that pilot tone is sent using same system resource.
In some possible embodiments, processor 44 executes described for all use same system resources transmission pilot tones
User equipment, to the reception signal carry out at least once the channel estimation of iteration the step of, specifically:
It is corresponding according to all user equipmenies for sending pilot tone using same system resource in the channel estimation of each iteration
Pilot frequency sequence setting sequence, for it is all using same system resource send pilot tone user equipmenies, to receptions letter
Number carry out serial channel estimation；Alternatively,
It is right for all user equipmenies for sending pilot tone using same system resource in the channel estimation of each iteration
The reception signal carries out Parallel channel estimation.
In some possible embodiments, processor 44 executes described in the channel estimation of each iteration, according to all
The setting sequence that the corresponding pilot frequency sequence of user equipment of pilot tone is sent using same system resource uses same tie for all
The step of resource of uniting sends the user equipment of pilot tone, carries out serial channel estimation to the reception signal, comprising:
In the channel estimation of each iteration, according to the setting sequence, successively eliminate according to its for receiving signal
It has estimated the interference signal that channel is accumulated by using the user equipment that same system resource sends pilot tone, obtains current use
The channel estimation results of family equipment；
The corresponding interference signal of the channel estimation results of the current user equipment is added to and described has estimated that channel tires out
Obtained interference signal is counted, and is repeated the above steps until obtaining all users for sending pilot tone using same system resource
The channel estimation results of equipment.
In some possible embodiments, the setting sequence is described all using same system resource transmission pilot tone
The sequence of the Signal to Interference plus Noise Ratio of the corresponding pilot frequency sequence of user equipment.
In some possible embodiments, processor 44 executes described in the channel estimation of each iteration, for all
Using same system resource send pilot tone user equipment, to the receptions signal progress Parallel channel estimation the step of, specifically
Are as follows:
In the channel estimation of each iteration, in all user equipmenies for sending pilot tone using same system resource
Each user equipment is eliminated and has been estimated according to the other user equipmenies for sending pilot tone using same system resource for receiving signal
The interference signal that meter channel is accumulated by, obtains the channel estimation results of each user equipment.
It is understood that the function of each functional module of the equipment 4000 of the present embodiment can be according to above method embodiment
In method specific implementation, specific implementation process is referred to the associated description of above method embodiment, and details are not described herein again.
A kind of channel estimating apparatus provided according to embodiments of the present invention is established on the basis of known pilot signal, and is believed
Road is unknown, is not related to the encoding and decoding of data-signal, can reduce the interference between multiple signals of same frequency, improve channel estimation
Precision, channel estimation process are simple.
It should be noted that for the various method embodiments described above, for simple description, therefore, it is stated as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described because
According to the present invention, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art should also know
It knows, the embodiments described in the specification are all preferred embodiments, and related actions and modules is not necessarily of the invention
It is necessary.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can be with
It is realized with hardware realization or firmware realization or their combination mode.It when implemented in software, can be by above-mentioned function
Storage in computer-readable medium or as on computer-readable medium one or more instructions or code transmitted.Meter
Calculation machine readable medium includes computer storage media and communication media, and wherein communication media includes convenient for from a place to another
Any medium of a place transmission computer program.Storage medium can be any usable medium that computer can access.With
For this but be not limited to: computer-readable medium may include random access memory (Random Access Memory,
RAM), read-only memory (Read-Only Memory, ROM), Electrically Erasable Programmable Read-Only Memory (Electrically
Erasable Programmable Read-Only Memory, EEPROM), CD-ROM (Compact Disc Read-
Only Memory, CD-ROM) or other optical disc storages, magnetic disk storage medium or other magnetic storage apparatus or can be used in
Carry or storage have instruction or data structure form desired program code and can by computer access any other
Medium.Furthermore.Any connection appropriate can become computer-readable medium.For example, if software is using coaxial cable, light
Fine optical cable, twisted pair, Digital Subscriber Line (Digital Subscriber Line, DSL) or such as infrared ray, radio and
The wireless technology of microwave etc is transmitted from website, server or other remote sources, then coaxial cable, optical fiber cable, double
The wireless technology of twisted wire, DSL or such as infrared ray, wireless and microwave etc includes in the fixing of affiliated medium.Such as this hair
Used in bright, disk (Disk) and dish (disc) include compress optical disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD),
Floppy disk and Blu-ray Disc, the usually magnetic replicate data of which disk, and dish is then with laser come optical replicate data.Group above
Conjunction should also be as including within the protection scope of computer-readable medium.
In short, being not intended to limit of the invention the foregoing is merely the preferred embodiment of technical solution of the present invention
Protection scope.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in
Within protection scope of the present invention.
Claims (6)
1. a kind of channel estimation methods characterized by comprising
The reception signal for being used for channel estimation is obtained, the reception signal is that multiple user equipmenies are sent in same system resource
Signal of the pilot frequency sequence with out of phase deviant after channel；
For all user equipmenies for sending pilot tone using same system resource, iteration at least once is carried out to the reception signal
Channel estimation；
Export the channel estimation results of all user equipmenies that pilot tone is sent using same system resource；
It is described to be directed to all user equipmenies that pilot tone is sent using same system resource, the reception signal is carried out at least once
The channel estimation of iteration, specifically:
In the channel estimation of each iteration, led according to all user equipmenies for sending pilot tone using same system resource are corresponding
Frequency sequence setting sequence, for it is all using same system resource send pilot tone user equipmenies, to the reception signal into
The serial channel estimation of row, the setting sequence are that all user equipmenies for sending pilot tone using same system resource are corresponding
Pilot frequency sequence Signal to Interference plus Noise Ratio sequence.
2. the method as described in claim 1, which is characterized in that it is described in the channel estimation of each iteration, make according to all
The setting sequence that the corresponding pilot frequency sequence of user equipment of pilot tone is sent with same system resource uses same system for all
Resource sends the user equipment of pilot tone, carries out serial channel estimation to the reception signal, comprising:
In the channel estimation of each iteration, according to the setting sequence, successively eliminating makes according to reception the other of signal
The interference signal that channel is accumulated by has been estimated with the user equipment that same system resource sends pilot tone, obtains current user equipment
Channel estimation results；
The corresponding interference signal of the channel estimation results of the current user equipment is added to and described has estimated that channel is accumulative
The interference signal arrived, and repeat the above steps until obtaining all user equipmenies for sending pilot tone using same system resource
Channel estimation results.
3. a kind of channel estimating apparatus characterized by comprising
Acquiring unit, for obtaining the reception signal for being used for channel estimation, the reception signal is multiple user equipmenies identical
Signal of the pilot frequency sequence with out of phase deviant sent in system resource after channel；
Channel estimating unit, for believing the reception for all user equipmenies for sending pilot tone using same system resource
Number carry out the channel estimation of iteration at least once；
Output unit, for exporting the channel estimation results of all user equipmenies for sending pilot tone using same system resource；
The channel estimating unit is specifically used in the channel estimation of each iteration, is sent out according to all using same system resource
The setting sequence for sending the corresponding pilot frequency sequence of the user equipment of pilot tone, for all use for sending pilot tone using same system resource
Family equipment carries out serial channel estimation to the reception signal, and the setting sequence is that all use same systems provide
Source sends the sequence of the Signal to Interference plus Noise Ratio of the corresponding pilot frequency sequence of user equipment of pilot tone.
4. device as claimed in claim 3, which is characterized in that the channel estimating unit includes:
Obtaining unit, for according to the setting sequence, successively eliminating according to the reception in the channel estimation of each iteration
Other user equipmenies for sending pilot tone using same system resource of signal have estimated the interference signal that channel is accumulated by, and obtain
The channel estimation results of current user equipment；
Summing elements described have been estimated for the corresponding interference signal of the channel estimation results of the current user equipment to be added to
The interference signal that meter channel is accumulated by.
5. a kind of channel estimating apparatus, which is characterized in that including input unit, output device, memory and processor；
Wherein, the processor is for executing following steps:
The reception signal for being used for channel estimation is obtained, the reception signal is that multiple user equipmenies are sent in same system resource
Signal of the pilot frequency sequence with out of phase deviant after channel；
For all user equipmenies for sending pilot tone using same system resource, iteration at least once is carried out to the reception signal
Channel estimation；
Export the channel estimation results of all user equipmenies that pilot tone is sent using same system resource；
The processor is directed to all user equipmenies that pilot tone is sent using same system resource described in executing, and believes the reception
Number carry out at least once the channel estimation of iteration the step of, specifically:
In the channel estimation of each iteration, led according to all user equipmenies for sending pilot tone using same system resource are corresponding
Frequency sequence setting sequence, for it is all using same system resource send pilot tone user equipmenies, to the reception signal into
The serial channel estimation of row, the setting sequence are that all user equipmenies for sending pilot tone using same system resource are corresponding
Pilot frequency sequence Signal to Interference plus Noise Ratio sequence.
6. equipment as claimed in claim 5, which is characterized in that the processor executes the channel estimation in each iteration
In, according to the setting sequence of all corresponding pilot frequency sequences of user equipment for sending pilot tone using same system resource, for institute
The step of having the user equipment for sending pilot tone using same system resource, serial channel estimation is carried out to the reception signal,
Include:
In the channel estimation of each iteration, according to the setting sequence, successively eliminating makes according to reception the other of signal
The interference signal that channel is accumulated by has been estimated with the user equipment that same system resource sends pilot tone, obtains current user equipment
Channel estimation results；
The corresponding interference signal of the channel estimation results of the current user equipment is added to and described has estimated that channel is accumulative
The interference signal arrived, and repeat the above steps until obtaining all user equipmenies for sending pilot tone using same system resource
Channel estimation results.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2013/088250 WO2015078016A1 (en) | 2013-11-30 | 2013-11-30 | Channel estimation method, apparatus and device |
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