CN105337920B - A kind of multi-mode wireless communications system eliminated based on interference - Google Patents
A kind of multi-mode wireless communications system eliminated based on interference Download PDFInfo
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- CN105337920B CN105337920B CN201510616893.7A CN201510616893A CN105337920B CN 105337920 B CN105337920 B CN 105337920B CN 201510616893 A CN201510616893 A CN 201510616893A CN 105337920 B CN105337920 B CN 105337920B
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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
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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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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Abstract
The present invention relates to a kind of multi-mode wireless communications systems eliminated based on interference, the mobile client that a variety of carrier modulation modes are communicated is used the system comprises base station and positioned at base station both ends, carrier wave modulation code allocation table is mapped by establishing multi-mode matching to the mobile client for executing two-way communication, then the carrier modulation code corresponding to all mobile clients in one end is directly summed, and interference is executed according to obtained combined information and is eliminated, both interference had been greatly reduced, also power system capacity is improved, there is beneficial technique effect.
Description
Technical field
The present invention relates to wireless communication field more particularly to a kind of multi-mode wireless communications systems eliminated based on interference.
Background technology
With the development and application of the fast development of the communication technology, especially 4G technologies, the transmission rate of wireless communication obtains
It is promoted to great, data traffic types are also constantly changing, and various high-speed data services obtain more and more
Using.In these new technologies or new business, the object that is communicated with each mobile client is far above one, and communication pattern is not yet
It is limited as one kind, allowing for the matching between client in this way becomes complexity, and interference is on the increase, the distribution of radio resource
Also become more nervous.
On the other hand, for the base station for executing above-mentioned communication service or eNodeB, used by communicating pair
Communication standard simultaneously differs, and base station needs to carry out multiple carrier modulation when sending into row information, could send the communication information
To corresponding mobile client；However, due to the non-fully desired orthogonality of carrier modulation code, when the number clients for executing communication
When mesh increases, communication process just will produce more serious interference, influence communication quality.
Therefore, defect in the prior art how is solved, the capacity of communication system is promoted, reducing interference just becomes the present invention
Research contents.
Invention content
The purpose of the present invention is what is be achieved through the following technical solutions.
According to the embodiment of the present invention, a kind of multi-mode wireless communications system eliminated based on interference, the system are proposed
System includes base station and uses the mobile client that a variety of carrier modulation modes are communicated positioned at base station both ends：
The base station to the multiple mobile clients for participating in communication for executing pre-configuration first；The pre-configuration includes：
The base station establishes multi-mode matching mapping graph and executes parameter configuration initialization operation, then is moved for the both ends for sending communication request
Dynamic groups of clients is responded, and is analyzed the communication request and is established multi-mode matching mapping carrier wave modulation code allocation table, for two
End matching mobile client starts to communicate；
Later, the mobile client at the base station both ends sends information to base station simultaneously；Some mobile client of base station one end
Hold LiCarrier modulation code corresponding to all mobile clients of the other end communicated with is directly summed, i.e. the mobile client
LiAll non-zero point value summations of corresponding row in multi-mode matching maps carrier wave modulation code allocation table, with the carrier modulation code
The sum of to being sent after transmitting information by carrier modulation；Similarly, some mobile client of base station other end RjBy what is communicated with
The carrier modulation code that all mobile client groups in one end are answered directly is summed, i.e. mobile client RjIn multi-mode matching mapping truck
All non-zero point value summations of corresponding row in wave modulation code allocation table, then with the sum of the carrier modulation code to transmitting information by
It is sent after carrier modulation；
The base station is additionally operable to that the information received is captured and locked, then with corresponding carrier modulation code to capture
After the information carrier demodulation after locking, the combined information that its both ends matching mobile client sends information is obtained；
Then, base station in turn executes interference to the combined information of each pair of mobile client obtained after carrier wave demodulation and eliminates
Operation.
According to the embodiment of the present invention, the base station is additionally operable to setting recognition threshold；Later, base station is according to recognition threshold
It executes and identifies and obtain recognition result；The combined information that both ends are matched with mobile client carries out partly plus then operation passes through phase
Information after half plus operation is carried out carrier modulation by the carrier modulation code answered, and is sent.
According to the embodiment of the present invention, the mobile client termination, which is collected mail, ceases and is carried out with corresponding carrier modulation code
Carrier wave demodulation obtains the combined information of base station transmission：
In formula, uabFor object matching mobile client a, b, i.e., a-th of base station one end mobile client receive and its
Information after b-th of mobile client carrier wave demodulation of the other end of communication, αnFor the weak coefficient of channel, LcFor the length of modulation sequence
Degree, p is transmission power, infabFor the interference in transmission, n0For white Gaussian noise, T indicates transposition；What the combined information included does
Disturb for：
In formula, cij≠cabIndicate cijIt is to remove object matching communication mobile client cabThe mobile visitor of remaining matching in addition
Carrier modulation code corresponding to the end of family.
According to the embodiment of the present invention, the mobile client end executes after the combined information for receiving base station transmission
Interference cancellation operation：
First, the expression formula interfered
Then, mobile client end subtracts the interference in the reception information that carrier wave demodulation goes out, that is, completes interference and eliminate.
According to the embodiment of the present invention, the letter after eliminating is interfered in mobile client identification after executing interference and eliminating
Breath；The identification process is：
Wherein, uabInformation after being eliminated for interference；
Then, it is identified into row information according to mobile client local information, the identification parameter value is
In formula, rabFor information recognition result.
According to the embodiment of the present invention, base station sets recognition threshold includes：
WhereinThe real-time signal strength for the both ends mobile client that respectively base station receives,
paAnd qbThe transmission power of respectively optional object matching mobile client a, b；laAnd rbRespectively object matching mobile client
The binary piece of information for holding a, b to send；αaAnd αbFor the weak parameter of channel corresponding to mobile client a, b, then object matching shifting
Moving the criterion of identification corresponding to client a, b is：
In formula, dabFor the identification parameter value corresponding to selected object matching mobile client a, b, mabFor the target
With information transmitted by mobile client a, b in the combination of base station, IthFor its recognition threshold；dabWhen=1, base station both ends are indicated
The binary digit symbol of transmission is opposite；dabWhen=- 1, indicate that the binary digit symbol of base station both ends transmission is identical.
The multi-mode wireless communications system of the present invention eliminated based on interference, passes through the mobile client to executing two-way communication
Multi-mode matching mapping carrier wave modulation code allocation table is established at end, then by the carrier modulation corresponding to all mobile clients in one end
Code is directly summed, and is executed interference according to obtained combined information and eliminated, and interference had both been greatly reduced, and also improves system appearance
Amount has beneficial technique effect.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit are common for this field
Technical staff will become clear.Attached drawing only for the purpose of illustrating preferred embodiments, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Attached drawing 1 is shown to be shown according to the multi-mode wireless communications system structure of embodiment of the present invention eliminated based on interference
It is intended to.
Specific implementation mode
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure on the contrary, providing these embodiments, and can be by this public affairs
The range opened completely is communicated to those skilled in the art.
According to the embodiment of the present invention, a kind of multi-mode wireless communications system eliminated based on interference is proposed, such as attached drawing 1
It is shown, use the mobile client that a variety of carrier modulation modes are communicated the system comprises base station and positioned at base station both ends：
The base station executes pre-configuration to the multiple mobile clients for participating in communication first；The pre-configuration includes：It is described
Base station establishes multi-mode matching mapping graph and executes parameter configuration initialization operation, then moves visitor for the both ends for sending communication request
Family end group is responded, and is analyzed the communication request and is established multi-mode matching mapping carrier wave modulation code allocation table, for both ends
Start to communicate with mobile client；
Later, the mobile client at the base station both ends sends information to base station simultaneously；Some mobile client of base station one end
Hold LiCarrier modulation code corresponding to all mobile clients of the other end communicated with is directly summed, i.e. the mobile client
LiAll non-zero point value summations of corresponding row in multi-mode matching maps carrier wave modulation code allocation table, with the carrier modulation code
The sum of to being sent after transmitting information by carrier modulation；Similarly, some mobile client of base station other end RjBy what is communicated with
The carrier modulation code that all mobile client groups in one end are answered directly is summed, i.e. mobile client RjIn multi-mode matching mapping truck
All non-zero point value summations of corresponding row in wave modulation code allocation table, then with the sum of the carrier modulation code to transmitting information by
It is sent after carrier modulation；
The base station is additionally operable to that the information received is captured and locked, then with corresponding carrier modulation code to capture
After the information carrier demodulation after locking, the combined information that its both ends matching mobile client sends information is obtained；
Then, base station in turn executes interference to the combined information of each pair of mobile client obtained after carrier wave demodulation and eliminates
Operation；
Secondly, the base station is additionally operable to setting recognition threshold
WhereinThe real-time signal strength for the both ends mobile client that respectively base station receives,
paAnd qbThe transmission power of respectively optional object matching mobile client a, b；1aAnd rhRespectively object matching mobile client
The binary piece of information for holding a, b to send；αaAnd αbFor the weak parameter of channel corresponding to mobile client a, b, then object matching shifting
Moving the criterion of identification corresponding to client a, b is：
In formula, dabFor the identification parameter value corresponding to selected object matching mobile client a, b, mabFor the target
With information transmitted by mobile client a, b in the combination of base station, IthFor its recognition threshold；dabWhen=1, base station both ends are indicated
The binary digit symbol of transmission is opposite；dabWhen=- 1, indicate that the binary digit symbol of base station both ends transmission is identical；
Later, base station is executed according to recognition threshold identifies and obtains recognition result；Both ends are matched with the group of mobile client
It closes information and carries out half plus operation, then, the information after half plus operation is carried out by carrier modulation by corresponding carrier modulation code, and
It sends；
The carrier modulation process is：
In formula, tdFor the information that base station is sent to its both ends mobile client simultaneously,The signal work(sent for base station
Rate, dijIn base station combined information when being communicated for j-th of mobile client of i-th of base station one end mobile client and the other end
Identification parameter value, cijFor the carrier wave used when j-th of the mobile client communication of i-th of base station one end mobile client and the other end
Modulation code, there are two types of the information binary digits that base station is sent：+ 1 and -1, the carrier wave tune for being respectively+1 by all identification parameter values
After code summation processed, right+1 carries out carrier modulation, then after the carrier modulation code summation for being -1 by all identification parameter values, p- 1 carries out
Carrier modulation；
The mobile client termination, which is collected mail, to cease and carries out carrier wave demodulation with corresponding carrier modulation code, obtains base station transmission
Combined information：
In formula, uabFor object matching mobile client a, b, i.e., a-th of base station one end mobile client receive and its
Information after b-th of mobile client carrier wave demodulation of the other end of communication, αaFor the weak coefficient of channel, LcFor the length of modulation sequence
Degree, p is transmission power, infabFor the interference in transmission, n0For white Gaussian noise, T indicates transposition；What the combined information included does
Disturb for：
In formula, cij≠cabIndicate cijIt is to remove object matching communication mobile client cabThe mobile visitor of remaining matching in addition
Carrier modulation code corresponding to the end of family；
And mobile client end executes interference cancellation operation：The interference cancelling system phase that specific system is executed with base station
Together,
First, the expression formula interfered
Then, mobile client end subtracts the interference in the reception information that carrier wave demodulation goes out, that is, completes interference and eliminate；
Then, the information after mobile client identification interference is eliminated；The identification process is：
Wherein, uabInformation after being eliminated for interference；
Then, it is identified into row information according to mobile client local information, the identification parameter value is
In formula, rabFor information recognition result.
According to the embodiment of the present invention, the base station executes the multiple mobile clients for participating in communication and is pre-configured specifically
Including：
S1-1, multi-mode matching mapping graph is established：Base station according to both ends mobile client quantity establish one it is correspondingly sized
Matching relationship table, dimension be m × n ranks, the initial value of the table point value is zero, m and n is respectively the line number and columns of table, table
Show the communication mobile client sum at base station both ends；Each point value in m × n rank tables also uses natural number subscript i and j difference
As its row identifier and row identifier, and the maximum value of i and j is respectively m and n, so that in the multi-mode matching mapping graph
All point values are all corresponded with the matching mobile client at base station both ends；
S1-2, in the multi-mode matching mapping graph, base station is asked according to mobile client, request communication mobile visitor
Table point value corresponding to the group of family end is set to 1, and the table point value corresponding to the mobile client group of no communication request is set to 0；
S1-3, base station traverse the multi-mode matching mapping graph, to there is the mobile client group of communication request to distribute per a pair
One carrier modulation code, and be stored in matching relationship carrier modulation code allocation table.
According to the embodiment of the present invention, some mobile client of base station one end LiBy the other end communicated with institute
There is the carrier modulation code corresponding to mobile client directly to sum, then information binary digit is carried out with the sum of the carrier modulation code
It is sent after carrier modulation and includes：
Carrier modulation information tiMathematic(al) representation be：
In formula, tiIt is the carrier modulation information that base station receives, αiFor the weak coefficient of channel, piIt is the movement that identifier is i
The signal transmitting power of client, liIt is the information binary digit that it sends, liValue be ± 1, cijFor i-th of base station one end
J-th of mobile client of mobile client and the other end corresponding carrier modulation code when communicating.
According to the embodiment of the present invention, the information after the base station is captured and locked to it with corresponding carrier modulation code
Carrier wave demodulation, the combined information for obtaining its both ends matching mobile client are：
In formula, mabIt is base station when both ends identifier is respectively the matching mobile client communication of a and b, after carrier wave demodulation
Obtained combined information, tupFor the sum of the carrier modulation information that all mobile clients in both ends that base station receives are sent, c is to move
The carrier modulation code communicated between dynamic client, under be designated as the identifier of base station both ends mobile client, subscript T indicates it
For the transposed vector of carrier modulation code, LcFor the length of carrier modulation code sequence, liAnd rjRespectively base station both ends identifier is distinguished
For the information binary digit of the mobile client of i and j, p and q are respectively the mobile client that the both ends identifier is respectively i and j
Signal transmitting power, inf be transmission in more mobile clients interference, n0For white Gaussian noise.
According to the embodiment of the present invention, the base station is in turn to each pair of mobile client for being obtained after carrier wave demodulation
Combined information executes interference cancellation operation and specifically includes：
S4-1, when the object matching mobile client of communication be respectively base station both ends a-th of mobile client and b-th
When mobile client, then the combined information of selected object matching mobile client a, b seeks to eliminate for its execution interference
All information, at this point, the information transmitted between other non-targeted mobile client groups is all considered as interference；
S4-2, go out its combined information in base station with the carrier modulation code carrier wave demodulation of non-targeted matching mobile client；
S4-3, carrier modulation code and the non-targeted mobile client that matches that mobile client a, b is matched with current goal
Carrier modulation code makees cross-correlation, and the value of the cross-correlation is multiplied by the combined information obtained in S4-2, and obtained product is exactly
The interference inf that all non-targeted matching mobile client groups are generated in current matching mobile client a, bab, expression formula is：
S4-4, interference inf is subtracted in the combined information of current selected object matching mobile client a, bdb, complete interference
It eliminates.
According to the embodiment of the present invention, it in the system, carries out interference for some object matching mobile client and builds
When mould, it is necessary to carry out carrier wave demodulation to the information of other non-targeted matching mobile clients, and after obtained carrier wave demodulation
Binary piece of information is also to be disturbed；Carrier wave demodulation information when in order to make interference eliminate is more ideal, using being cyclically updated
Mode carry out interference elimination；It is directed to the combined information of each pair of communication mobile client, primary interference is often carried out and eliminates, energy
Its ideal combined information is obtained, then carrying out identical interference again with the ideal combined information eliminates behaviour
Make so that the combined information is more ideal；After being repeatedly cyclically updated, more satisfactory matching mobile client can be obtained
Combined information；That is, when actual transmissions, to execute and repeatedly be cyclically updated interference elimination treatment, until the recovery ideality of information
Reach sets requirement.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention answers the protection model with claim
Subject to enclosing.
Claims (6)
1. a kind of multi-mode wireless communications system eliminated based on interference is used the system comprises base station and positioned at base station both ends
The mobile client that a variety of carrier modulation modes are communicated, wherein
The base station to the multiple mobile clients for participating in communication for executing pre-configuration first；The pre-configuration includes：It is described
Base station establishes multi-mode matching mapping graph and executes parameter configuration initialization operation, then moves visitor for the both ends for sending communication request
Family end group is responded, and is analyzed the communication request and is established multi-mode matching mapping carrier wave modulation code allocation table, for both ends
Start to communicate with mobile client；
The mobile client at the base station both ends sends information to base station simultaneously；Base station one end some mobile client LiWill with its
Carrier modulation code corresponding to all mobile clients of the other end of communication is directly summed, i.e. mobile client LiIn multi-mode
All non-zero point value summations of corresponding row in matching mapping carrier wave modulation code allocation table, with the sum of the carrier modulation code to transmission
Information is sent after carrying out carrier modulation；Similarly, some mobile client of base station other end RjBy all shiftings in the one end communicated with
The dynamic corresponding carrier modulation code of client is directly summed, i.e. mobile client RjIn multi-mode matching mapping carrier wave modulation code point
All non-zero point values summations with corresponding row in table, then with the sum of the carrier modulation code to transmitting information by carrier modulation after
It sends；
The base station is additionally operable to that the information received is captured and locked, then with corresponding carrier modulation code to capturing and locking
After information carrier demodulation after fixed, the combined information that its both ends matching mobile client sends information is obtained；
Base station in turn executes interference cancellation operation to the combined information of each pair of mobile client obtained after carrier wave demodulation；
The base station establishes multi-mode matching mapping graph and executes parameter configuration initialization operation, then to send the two of communication request
End mobile client group is responded, and is analyzed the communication request and is established multi-mode matching mapping carrier wave modulation code allocation table, with
Start communication for both ends matching mobile client to specifically include：
S1-1, multi-mode matching mapping graph is established：Base station establishes one of corresponding size according to both ends mobile client quantity
With relation table, dimension is m × n ranks, and the initial value of the table point value is zero, m and n is respectively the line number and columns of table, indicates base
It stands the communication mobile client sum at both ends；Each point value in m × n rank tables also use natural number subscript i and j respectively as
Its row identifier and row identifier, and the maximum value of i and j is respectively m and n, so that all in the multi-mode matching mapping graph
Point value is all corresponded with the matching mobile client at base station both ends；
S1-2, in the multi-mode matching mapping graph, base station is asked according to mobile client, request communication mobile client
The corresponding table point value of group is set to 1, and the table point value corresponding to the mobile client group of no communication request is set to 0；
S1-3, base station traverse the multi-mode matching mapping graph, to there is the mobile client group of communication request to distribute one per a pair
Carrier modulation code, and be stored in matching relationship carrier modulation code allocation table.
2. a kind of the system as claimed in claim 1, the base station is additionally operable to setting recognition threshold；Later, base station is according to identification
Threshold value, which executes, to be identified and obtains recognition result；The combined information that both ends are matched with mobile client carries out half plus operation, then, leads to
It crosses corresponding carrier modulation code and the information after half plus operation is subjected to carrier modulation, and send.
3. a kind of system as claimed in claim 2, the mobile client receive information and with corresponding carrier modulation code into
Row carrier wave demodulation obtains the combined information of base station transmission：
In formula, uabFor object matching mobile client a, b, i.e., what a-th of base station one end mobile client received communicates with
B-th of mobile client carrier wave demodulation of the other end after information, αaFor the weak coefficient of channel, LcFor the length of modulation sequence, p
For transmission power, infabFor the interference in transmission, n0For white Gaussian noise, T indicates transposition；The interference that the combined information includes
For：
In formula, cij≠cabIndicate cijIt is to remove object matching communication mobile client cabRemaining matching mobile client in addition
Corresponding carrier modulation code；tdFor the information that base station is sent to its both ends mobile client simultaneously, dijFor i-th of base station one end
In the identification parameter value of base station combined information when j-th of the mobile client communication of mobile client and the other end.
4. a kind of system as claimed in claim 3, the mobile client is held after the combined information for receiving base station transmission
Row interference cancellation operation：
First, the expression formula interfered
Then, mobile client subtracts the interference in the reception information that carrier wave demodulation goes out, that is, completes interference and eliminate.
5. a kind of system as claimed in claim 4, the mobile client after executing interference and eliminating after identifying that interference is eliminated
Information；The identification process is：
First, identification parameter value is calculated
Wherein, uabInformation after being eliminated for interference；
Then, it is identified into row information according to mobile client local information, the identification parameter value is
In formula, rabFor information recognition result, laThe binary piece of information sent for object matching mobile client a.
6. a kind of system as claimed in claim 5, base station sets recognition threshold include：
WhereinThe real-time signal strength for the both ends mobile client that respectively base station receives, paAnd qb
The transmission power of respectively optional object matching mobile client a, b；laAnd rbRespectively object matching mobile client a, b
The binary piece of information of transmission；αaAnd αbFor the weak parameter of channel corresponding to mobile client a, b, then object matching movement is objective
Criterion of identification corresponding to family end a, b is：
In formula, dabFor the identification parameter value corresponding to selected object matching mobile client a, b, mabIt is moved for the object matching
Information transmitted by client a, b is in the combination of base station, IthFor its recognition threshold；dabWhen=1, the transmission of base station both ends is indicated
Binary digit symbol is opposite；dabWhen=- 1, indicate that the binary digit symbol of base station both ends transmission is identical.
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| US8699319B2 (en) * | 2007-08-13 | 2014-04-15 | Sharp Kabushiki Kaisha | Base station device, reception device, wireless communication system, and wireless communication method |
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| CN102273113A (en) * | 2009-01-08 | 2011-12-07 | 夏普株式会社 | Transmitter apparatus, transmission method, communication system and communication method |
| CN103248377A (en) * | 2013-05-15 | 2013-08-14 | 哈尔滨工业大学 | Receiving-end signal interference elimination method of multi-carrier complementary code CDMA (code division multiple access) system |
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