CN116321440A - Interference cancellation method, device, interfered station and readable storage medium - Google Patents
Interference cancellation method, device, interfered station and readable storage medium Download PDFInfo
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Abstract
The application provides an interference cancellation method, an interference cancellation device, a interfered station and a readable storage medium. A cross-slot interference exists between a first time slot of the victim station and a second time slot of the offender station, the method comprising: performing resource muting on a first symbol, the first symbol being the first N symbols of the first slot; receiving first information on the first symbol, wherein the first information is downlink interference signals of the first N symbols of the second time slot; receiving second information on a second symbol, wherein the second symbol is a symbol of the first time slot except the first symbol, the second information comprises an uplink useful signal of the second symbol, and a downlink interference signal of the symbol of the second time slot except the first N symbols; and executing the elimination operation of the cross time slot interference according to the first information and the second information. The interference of the scrambling station to the interfered station can be reduced under the condition of not affecting the performance of the base station.
Description
Technical Field
Embodiments of the present application relate to the field of communications technologies, and in particular, to an interference cancellation method, an interference cancellation device, a victim station, and a readable storage medium.
Background
When two time division multiplexing (Time Division Duplex, TDD) systems use the same or closely adjacent frequencies, as shown in fig. 1, if the timeslots are not synchronized, the Downlink (D) of one TDD system will interfere with the Uplink (U) of the other TDD system, forming cross-timeslot interference.
At present, the interference between base stations is usually reduced by adopting modes of reducing the downlink transmission power of the scrambling station in the cross time slot or staggering the user resource frequency domains of the scrambling station and the scrambling station in the cross time slot. However, the above manner of mitigating inter-base station interference may affect coverage or capacity of the base station, resulting in lower performance of the base station.
Disclosure of Invention
The embodiment of the application provides an interference elimination method, an interference elimination device, a interfered station and a readable storage medium, so that the interference problem among base stations is solved on the basis of not reducing the performance of the base stations.
To solve the above problems, the present application is realized as follows:
in a first aspect, an embodiment of the present application provides an interference cancellation method applied to a victim station, where cross-slot interference exists between a first slot of the victim station and a second slot of an offender station, the method including:
performing resource silence on a first symbol, where the first symbol is the first N symbols of the first slot, N is a positive integer less than M, and M is the number of symbols included in the first slot;
receiving first information on the first symbol, wherein the first information is downlink interference signals of the first N symbols of the second time slot;
receiving second information on a second symbol, wherein the second symbol is a symbol of the first time slot except the first symbol, the second information comprises an uplink useful signal of the second symbol, and a downlink interference signal of the symbol of the second time slot except the first N symbols;
and executing the elimination operation of the cross time slot interference according to the first information and the second information. In a second aspect, an embodiment of the present application further provides an interference cancellation apparatus applied to a victim station, where cross-slot interference exists between a first slot of the victim station and a second slot of an offender station, where the apparatus includes:
a processor, configured to perform resource muting on a first symbol, where the first symbol is the first N symbols of the first slot, N is a positive integer less than M, and M is a number of symbols included in the first slot;
a transceiver for:
receiving first information on the first symbol, wherein the first information is downlink interference signals of the first N symbols of the second time slot;
receiving second information on a second symbol, wherein the second symbol is a symbol of the first time slot except the first symbol, the second information comprises an uplink useful signal of the second symbol, and a downlink interference signal of the symbol of the second time slot except the first N symbols;
the processor is further configured to perform an operation of cancelling the cross slot interference according to the first information and the second information.
In a third aspect, embodiments of the present application further provide a victim station, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; the processor is configured to read a program in the memory to implement the steps in the method according to the foregoing first aspect.
In a fourth aspect, embodiments of the present application further provide a readable storage medium storing a program, which when executed by a processor implements the steps of the method according to the first aspect.
In this embodiment of the present application, for a time slot that is subject to interference, a victim station may receive, by using a silence manner of the first N symbols, a downlink interference signal of a scrambling war on the first N symbols, and receive, by using other symbols, a superimposed signal of an uplink useful signal and a downlink interference signal of the scrambling war, so that the interference signal may be eliminated based on the downlink interference signal received on the first N symbols and the superimposed signal received on the other symbols, without changing the existing architecture, and on the basis that the performance of the base station is not affected, the influence of the interference signal of the scrambling station on the victim station may be reduced.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of cross slot interference provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of an interference cancellation method according to an embodiment of the present application;
FIG. 3 is a schematic diagram of interference measurement provided in an embodiment of the present application;
fig. 4 is a second flow chart of an interference cancellation method according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an interference cancellation device provided in the implementation of the present application;
fig. 6 is a schematic structural diagram of a victim station according to an implementation of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms "first," "second," and the like in embodiments of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the use of "and/or" in this application means at least one of the connected objects, such as a and/or B and/or C, is meant to encompass the 7 cases of a alone, B alone, C alone, and both a and B, both B and C, both a and C, and both A, B and C.
The interference cancellation method provided in the embodiment of the present application is described below.
Referring to fig. 2, fig. 2 is a schematic flow chart of an interference cancellation method provided in an embodiment of the present application. The interference cancellation method shown in fig. 2 may be applied to a victim station. Cross-slot interference exists between the first time slot of the victim station and the second time slot of the offender station. It is understood that the first time slot is a time slot for uplink reception, such as U or S, and the second time slot is a time slot for downlink transmission, such as D or S.
As shown in fig. 2, the interference cancellation method may include the steps of:
In a specific implementation, the performing resource muting on the first symbol may specifically be represented by any one of the following:
not receiving an uplink signal on the first symbol;
the scheduling of the first symbol is not performed so that uplink transmission corresponding to the first symbol is not performed.
The first symbol may comprise one or more (at least two) symbols. The value of N may be agreed by a protocol, or may be negotiated and determined by the scrambling station and the scrambling station, which is not limited in the embodiment of the present application. Alternatively, N may be 1,2 or 3, but is not limited thereto.
As the first symbol performs resource muting, it is understood that the victim station receives a downlink interference signal from the offender station on the first symbol.
In the embodiment of the present application, receiving the downlink interference signal may be understood as: downlink interference signals, i.e. interference measurements, are measured. The downlink interference signal may include at least one of: downlink control channels such as a physical downlink control channel (Physical Downlink Control Channel, PDCCH) and/or a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH); downlink reference signals.
Since the first time slot is a time slot for uplink reception and the first time slot is interfered by the downlink of the scrambling station, it can be understood that the scrambling station receives a superimposed signal of the uplink useful signal and the downlink interference signal on the second symbol. The uplink useful signal may include at least one of: uplink control channels such as physical uplink shared channel (Physical Uplink Shared Channel, PUSCH); demodulation reference signals (Demodulation Reference Signal, DMRS) and the like.
The second symbol may comprise one or more symbols. The symbols in the second symbol correspond to the symbols except the first N symbols in the second time slot one by one, and each symbol in the second symbol can receive a downlink interference signal of the symbol corresponding to the symbol in the second time slot.
And 204, executing the elimination operation of the cross time slot interference according to the first information and the second information.
In specific implementation, the interfered station can perform interference estimation, channel estimation and channel equalization based on the first information and the second information, so as to eliminate interference signals, output original estimated signals after interference elimination, and therefore, the subsequent processing of useful signals of the interfered station is not affected. Of course, in other implementations, the victim station may also cancel cross slot interference by using the first information and the second information in other manners after muting the first N symbols of the first slot, which is not limited in the embodiments of the present application.
According to the interference elimination method of the embodiment, for the time slot under interference, the interfered station can receive downlink interference signals of interference operation on the first N symbols in a silence mode of the first N symbols, and receive superimposed signals of uplink useful signals and downlink interference signals of interference operation on other symbols, so that interference signal elimination can be achieved based on the downlink interference signals received on the first N symbols and the superimposed signals received on the other symbols, the existing architecture is not required to be changed, and the influence of the interference signals of the interference operation station on the interfered station can be reduced on the basis that the performance of the base station is not influenced.
The implementation of step 204 is described in detail below.
Optionally, the performing the cancellation operation of the cross slot interference according to the first information and the second information includes:
performing interference estimation based on the first information to obtain a first interference estimation result;
generating a target channel estimation matrix according to the second information;
generating a second interference estimation result according to the second information and the target channel estimation matrix;
and performing channel equalization based on the first interference estimation result, the target channel estimation matrix, the second interference estimation result and target information to obtain an estimated signal after cross time slot interference cancellation, wherein the target information is generated based on the first information and the second information.
In this alternative embodiment, the interfered station may perform interference estimation based on the first information; and sequentially carrying out channel estimation and interference estimation between the interfered station and the scrambling station based on the second information. And then, carrying out channel equalization based on the estimation results to eliminate interference signals and output original estimation signals after interference elimination, so that the subsequent processing of useful signals of the interfered station is not influenced.
In particular, the interfered station may transmit the downlink interference signal Y in the first information 1 As the first interference estimation result I 1 I.e. i2= |y 1 ‖ 2 。
In the case that the second symbol includes a symbol that receives an uplink reference signal, the victim station may perform channel estimation based on the uplink reference signal sequence received by the second symbol and the second information, to obtain the target channel estimation matrix.
Optionally, the second symbol includes a third symbol and a fourth symbol, where the third symbol is used to receive a target uplink reference signal, and the fourth symbol is used to receive other uplink signals except the target uplink reference signal;
the generating a target channel estimation matrix according to the second information includes:
performing channel estimation based on the second information and the target uplink reference signal to obtain a first channel estimation matrix corresponding to the third symbol;
calculating a second channel estimation matrix corresponding to the fourth symbol by using a linear difference method based on the first channel estimation result;
and splicing the first channel estimation result and the second channel estimation result to obtain a target channel estimation matrix.
The third symbol may include one or more symbols, and the fourth symbol may include one or more symbols, which may be specifically determined according to practical situations, which is not limited in the embodiments of the present application.
In practice, the victim station may estimate a first channel estimation matrix H corresponding to the third symbol based on the target uplink reference signal and the superimposed signal of the received uplink useful signal and downlink interference signal 1 The method comprises the steps of carrying out a first treatment on the surface of the Thereafter, based on the first channel estimation result H 1 By linear differencesCalculating a second channel estimation matrix H corresponding to the fourth symbol by a value method 2 . Then, by concatenating the first channel estimation matrix H 1 And said second channel estimation matrix H 2 Obtaining a target channel estimation matrix H, namely H= [ H1, H2]。
It should be noted that, the manner of obtaining the first channel estimation matrix and the second channel estimation matrix may be referred to the related art, which is not described herein. The concatenation order of the first channel estimation result and the second channel estimation result is related to the sequence of the third symbol and the fourth symbol in the time domain, for example: if the third symbol is before the fourth symbol, the second channel estimation result can be spliced after the first channel estimation result; if the third symbol follows the fourth symbol, the first channel estimation result may be spliced after the second channel estimation result.
After the receiving station acquires the target channel estimation matrix, the receiving station can reconstruct the uplink useful signal based on the target channel estimation matrix, and then obtain the second interference estimation result based on the reconstructed uplink useful signal and the received superposition signal of the uplink useful signal and the downlink interference signal.
Optionally, the second symbol includes a third symbol and a fourth symbol, where the third symbol is used to receive a target uplink reference signal, and the fourth symbol is used to receive other uplink signals except the target uplink reference signal;
and generating a second interference estimation result according to the second information and the target channel estimation matrix, wherein the second interference estimation result comprises:
performing signal reconstruction based on the target uplink reference signal and the target channel estimation matrix to obtain a reconstructed useful signal;
and performing interference estimation based on the second information and the reconstructed useful signal to obtain a second interference estimation result.
In practice, the victim station may transmit the target uplink reference signal S UL Multiplying the target channel estimation matrix H to obtainTo reconstruct the useful signal Y 1 I.e. Y 1 ＝S UL H。
The interfered station can then base the received superimposed signal Y of the uplink useful signal and the downlink interference signal 2 And reconstructing the useful signal Y 3 And calculating the difference value of the first interference estimation result. Specifically, the power of the difference may be used as the second interference estimation result I 2. I.e. I 2 ＝‖Y 2 -Y 3 ‖ 2 。
After performing the above-mentioned interference estimation and channel estimation, the victim station may perform channel equalization based on each estimation result, resulting in an original estimation signal after eliminating the cross slot interference.
Optionally, the performing channel equalization based on the first interference estimation result, the target channel estimation matrix, the second interference estimation result and the target information to obtain an estimated signal after the cross slot interference cancellation includes:
calculating an interference cancellation matrix by using a minimum mean square error (Minimum Mean Square Error, MMSE) based on the first interference estimation result, the second interference estimation result and the target channel estimation matrix;
and generating an estimated signal after the cross time slot interference cancellation according to the interference cancellation matrix and target information, wherein the target information is generated based on the first information and the second information.
In practice, the victim station can splice the first interference estimation results I 1. And the second interference estimation result I 2. Obtaining I, and then obtaining the interference cancellation matrix G by MMSE calculation based on I and H, and a specific calculation manner may be referred to the related art, which is not described herein.
The victim station may splice the first information and the second information to obtain superposition information Y, and then may take the product of Y and G as an original estimated signal after interference cancellation, i.e. x=gχy.
Before performing channel equalization, the victim station may perform operations such as resource muting, interference estimation, and channel estimation in units of time slots, and in the course of channel equalization, channel equalization may be performed in units of frames, so that the operation load of the victim station may be reduced.
Therefore, through the above mode, the interfered station can perform channel equalization by silencing the first N symbols of the interfered time slot, using the downlink interference signals obtained by measuring the first N symbols of the time slot and the superposition signals obtained by measuring other symbols of the time slot, so as to eliminate the interference of the cross time slot, thereby reducing the influence of the interference signals of the interfering station on the interfered station on the basis of not affecting the performance of the base station.
In the embodiment of the present application, the victim station may be a macro station or a pico station, and the Shi Rao station may also be a macro station or a pico station, and the embodiment of the present disclosure is not limited to the types of the victim station and the victim station, that is, the embodiment of the present application may be applied to any type of interference source. For example, the interference cancellation method of the embodiment of the present application may be applicable to the following scenarios:
scene one: macro station and macro station, downlink to uplink interference;
scene II: the macro station and the pico station are in uplink interference to the pico station by the macro station downlink, or in uplink interference to the macro station by the pico station downlink;
scene III: the leather station and the leather station interfere with each other in the uplink direction in the downlink direction.
The various optional implementations described in the embodiments of the present application may be implemented in combination with each other without collision with each other, or may be implemented separately, which is not limited to the embodiments of the present application.
For ease of understanding, the interference measurement schematic diagram in connection with fig. 3 is exemplified as follows:
in fig. 3, a scrambling station downlink symbol may be used for transmitting PDCCH and PDSCH, and a scrambling station uplink symbol may be used for transmitting PUSCH and DMRS. In addition, in the following example, the first symbol muting resource is illustrated, i.e., N is equal to 1.
1. Overall architecture.
The interference elimination method can finish the elimination of the received interference signals before uplink equalization, so that the subsequent processing of useful signals of the interfered station is not affected; meanwhile, a better interference elimination effect can be achieved under the condition of not losing the capacity and coverage of the base station; aiming at different interference source types, a scheme and a framework for matched control channel interference elimination are provided, macro-micro cooperation and configuration interaction, framework modification and hardware modification can be not relied on, and the processing complexity of a interfered station under the interference condition and the matching difficulty of different manufacturers of the interference station and the interfered station are further reduced. The process flow of the interfered station distinguishes the first symbol and the non-first symbol resources to perform interference cancellation and channel equalization respectively, and can be seen in fig. 4.
In fig. 4, the first symbol may sequentially perform uplink reception and interference estimation after muting resources. The non-initial symbol may perform uplink reception, channel estimation, and interference estimation in sequence. The victim station may then perform channel equalization. The concrete explanation is as follows:
2. first symbol interference estimation
And (5) uplink receiving: the interfered station measures the downlink interference signal of the PDCCH control channel of the scrambling station on the specific resource position of the first symbol by the mode of silencing the resource of the first symbol, and then obtains the obtained interference signal between the base stations, and inputs the obtained interference signal to the interference estimation module.
Interference estimation: and taking the measured interference signal power as an interference estimation result, and inputting the interference signal power into a channel equalization module.
3. Other symbol interference estimation
And (5) uplink receiving: and the interfered station receives the superposition data of the uplink useful signal of the terminal and the downlink interference signal of the PDSCH service channel of the scrambling station at other resource positions than the first symbol, and inputs the superposition data into the channel estimation module.
Channel estimation: the interfered station estimates a PUSCH channel matrix H1 on the symbol position of the uplink DMRS time domain based on the uplink reference signal DMRS sequence, obtains a PUSCH channel estimation result H2 of the symbol where the non-first symbol other than the DMRS time domain is located according to a linear difference method, and inputs the H= [ H1, H2] to the interference estimation module.
Interference estimation: acquiring useful signal reconstruction data based on an uplink reference signal DMRS sequence and a channel estimation matrix H, and receiving superposition data Y according to uplink PDSCH And obtaining an interference estimation result by the difference value of the useful signal reconstruction data, and inputting the interference estimation result to a channel equalization module.
4. Channel equalization
And respectively transmitting the interference estimation results based on the first symbol and other symbols and the uplink received superposition data Y to a channel equalization module, obtaining G based on MMSE minimum mean square error, and outputting an original estimation signal X=G×Y after interference elimination.
In the interference elimination method, the control channel interference measurement and the interference elimination are realized through the first symbol silence frequency domain resource, the original channel balance is not affected, and macro-micro coordination and architecture modification are not relied on. The interference problem of the macro station and the macro station, the macro station and the pico station can be further reduced, and the performance of the system and the throughput of a cell are improved.
Referring to fig. 5, fig. 5 is a block diagram of an interference cancellation device provided in an embodiment of the present application. The interference cancellation device is applied to a victim station, where cross-slot interference exists between a first slot of the victim station and a second slot of an offender station, as shown in fig. 5, and the interference cancellation device 500 includes:
a processor 501, configured to perform resource muting on a first symbol, where the first symbol is the first N symbols of the first slot, N is a positive integer less than M, and M is the number of symbols included in the first slot;
a transceiver 502 for:
receiving first information on the first symbol, wherein the first information is downlink interference signals of the first N symbols of the second time slot;
receiving second information on a second symbol, wherein the second symbol is a symbol of the first time slot except the first symbol, the second information comprises an uplink useful signal of the second symbol, and a downlink interference signal of the symbol of the second time slot except the first N symbols;
the processor 501 is further configured to perform an operation of cancelling the cross slot interference according to the first information and the second information.
Optionally, the processor 501 is configured to:
performing interference estimation based on the first information to obtain a first interference estimation result;
generating a target channel estimation matrix according to the second information;
generating a second interference estimation result according to the second information and the target channel estimation matrix;
and performing channel equalization based on the first interference estimation result, the target channel estimation matrix, the second interference estimation result and target information to obtain an estimated signal after cross time slot interference cancellation, wherein the target information is generated based on the first information and the second information.
Optionally, the second symbol includes a third symbol and a fourth symbol, where the third symbol is used to receive a target uplink reference signal, and the fourth symbol is used to receive other uplink signals except the target uplink reference signal;
the processor 501 is configured to:
performing channel estimation based on the second information and the target uplink reference signal to obtain a first channel estimation matrix corresponding to the third symbol;
calculating a second channel estimation matrix corresponding to the fourth symbol by using a linear difference method based on the first channel estimation result;
and splicing the first channel estimation result and the second channel estimation result to obtain a target channel estimation matrix.
Optionally, the second symbol includes a third symbol and a fourth symbol, where the third symbol is used to receive a target uplink reference signal, and the fourth symbol is used to receive other uplink signals except the target uplink reference signal;
the processor 501 is configured to:
performing signal reconstruction based on the target uplink reference signal and the target channel estimation matrix to obtain a reconstructed useful signal;
and performing interference estimation based on the second information and the reconstructed useful signal to obtain a second interference estimation result.
Optionally, the processor 501 is configured to:
based on the first interference estimation result, the second interference estimation result and the target channel estimation matrix, calculating to obtain an interference elimination matrix by using a Minimum Mean Square Error (MMSE);
and generating an estimated signal after the cross time slot interference cancellation according to the interference cancellation matrix and target information, wherein the target information is generated based on the first information and the second information.
The interference cancellation device 500 can implement the processes of the method embodiment of fig. 2 in the embodiment of the present application, and achieve the same beneficial effects, and for avoiding repetition, a detailed description is omitted here.
The embodiment of the application also provides a disturbed station. Referring to fig. 6, the victim station may include a processor 601, a memory 602, and a program 6021 stored on the memory 602 and executable on the processor 601. The program 6021, when executed by the processor 601, may implement any steps and achieve the same advantageous effects in the method embodiment corresponding to fig. 2, and will not be described herein.
Those of ordinary skill in the art will appreciate that all or a portion of the steps of implementing the methods of the embodiments described above may be implemented by hardware associated with program instructions, where the program may be stored on a readable medium. The embodiment of the present application further provides a readable storage medium, where a computer program is stored, where any step in the method embodiment corresponding to fig. 2 can be implemented and the same technical effect can be achieved when the computer program is executed by a processor, so that repetition is avoided and no further description is provided herein.
Such as Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic or optical disk, etc.
While the foregoing is directed to the preferred embodiments of the present application, it will be appreciated by those of ordinary skill in the art that numerous modifications and variations can be made without departing from the principles set forth herein, and such modifications and variations are to be regarded as being within the scope of the present application.
Claims (12)
1. An interference cancellation method applied to a victim station, wherein cross-slot interference exists between a first time slot of the victim station and a second time slot of an offender station, the method comprising:
performing resource silence on a first symbol, where the first symbol is the first N symbols of the first slot, N is a positive integer less than M, and M is the number of symbols included in the first slot;
receiving first information on the first symbol, wherein the first information is downlink interference signals of the first N symbols of the second time slot;
receiving second information on a second symbol, wherein the second symbol is a symbol of the first time slot except the first symbol, the second information comprises an uplink useful signal of the second symbol, and a downlink interference signal of the symbol of the second time slot except the first N symbols;
and executing the elimination operation of the cross time slot interference according to the first information and the second information.
2. The method of claim 1, wherein said performing a cancellation operation of said cross-slot interference based on said first information and said second information comprises:
performing interference estimation based on the first information to obtain a first interference estimation result;
generating a target channel estimation matrix according to the second information;
generating a second interference estimation result according to the second information and the target channel estimation matrix;
and performing channel equalization based on the first interference estimation result, the target channel estimation matrix, the second interference estimation result and target information to obtain an estimated signal after cross time slot interference cancellation, wherein the target information is generated based on the first information and the second information.
3. The method of claim 2, wherein the second symbols comprise third symbols for receiving a target uplink reference signal and fourth symbols for receiving other uplink signals than the target uplink reference signal;
the generating a target channel estimation matrix according to the second information includes:
performing channel estimation based on the second information and the target uplink reference signal to obtain a first channel estimation matrix corresponding to the third symbol;
calculating a second channel estimation matrix corresponding to the fourth symbol by using a linear difference method based on the first channel estimation result;
and splicing the first channel estimation result and the second channel estimation result to obtain a target channel estimation matrix.
4. The method of claim 2, wherein the second symbols comprise third symbols for receiving a target uplink reference signal and fourth symbols for receiving other uplink signals than the target uplink reference signal;
and generating a second interference estimation result according to the second information and the target channel estimation matrix, wherein the second interference estimation result comprises:
performing signal reconstruction based on the target uplink reference signal and the target channel estimation matrix to obtain a reconstructed useful signal;
and performing interference estimation based on the second information and the reconstructed useful signal to obtain a second interference estimation result.
5. The method of claim 2, wherein performing channel equalization based on the first interference estimation result, the target channel estimation matrix, the second interference estimation result, and target information to obtain the estimated signal after cross-slot interference cancellation comprises:
based on the first interference estimation result, the second interference estimation result and the target channel estimation matrix, calculating to obtain an interference elimination matrix by using a Minimum Mean Square Error (MMSE);
and generating an estimated signal after the cross time slot interference cancellation according to the interference cancellation matrix and target information, wherein the target information is generated based on the first information and the second information.
6. An interference cancellation device for use in a victim station, wherein cross-slot interference exists between a first time slot of the victim station and a second time slot of an offender station, the device comprising:
a processor, configured to perform resource muting on a first symbol, where the first symbol is the first N symbols of the first slot, N is a positive integer less than M, and M is a number of symbols included in the first slot;
a transceiver for:
receiving first information on the first symbol, wherein the first information is downlink interference signals of the first N symbols of the second time slot;
receiving second information on a second symbol, wherein the second symbol is a symbol of the first time slot except the first symbol, the second information comprises an uplink useful signal of the second symbol, and a downlink interference signal of the symbol of the second time slot except the first N symbols;
the processor is further configured to perform an operation of cancelling the cross slot interference according to the first information and the second information.
7. The apparatus of claim 6, wherein the processor is configured to:
performing interference estimation based on the first information to obtain a first interference estimation result;
generating a target channel estimation matrix according to the second information;
generating a second interference estimation result according to the second information and the target channel estimation matrix;
and performing channel equalization based on the first interference estimation result, the target channel estimation matrix, the second interference estimation result and target information to obtain an estimated signal after cross time slot interference cancellation, wherein the target information is generated based on the first information and the second information.
8. The apparatus of claim 7, wherein the second symbols comprise third symbols for receiving a target uplink reference signal and fourth symbols for receiving other uplink signals than the target uplink reference signal;
the processor is configured to:
performing channel estimation based on the second information and the target uplink reference signal to obtain a first channel estimation matrix corresponding to the third symbol;
calculating a second channel estimation matrix corresponding to the fourth symbol by using a linear difference method based on the first channel estimation result;
and splicing the first channel estimation result and the second channel estimation result to obtain a target channel estimation matrix.
9. The apparatus of claim 7, wherein the second symbols comprise third symbols for receiving a target uplink reference signal and fourth symbols for receiving other uplink signals than the target uplink reference signal;
the processor is configured to:
performing signal reconstruction based on the target uplink reference signal and the target channel estimation matrix to obtain a reconstructed useful signal;
and performing interference estimation based on the second information and the reconstructed useful signal to obtain a second interference estimation result.
10. The apparatus of claim 7, wherein the processor is configured to:
based on the first interference estimation result, the second interference estimation result and the target channel estimation matrix, calculating to obtain an interference elimination matrix by using a Minimum Mean Square Error (MMSE);
and generating an estimated signal after the cross time slot interference cancellation according to the interference cancellation matrix and target information, wherein the target information is generated based on the first information and the second information.
11. A victim station, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor; -c h a r a c t e r i z e d in that the processor is arranged to read a program in a memory for implementing the steps in the interference cancellation method according to any one of claims 1 to 5.
12. A readable storage medium storing a program, wherein the program, when executed by a processor, implements the steps in the interference cancellation method of any one of claims 1 to 5.
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| CN202111562630.4A CN116321440A (en) | 2021-12-20 | 2021-12-20 | Interference cancellation method, device, interfered station and readable storage medium |
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