CN113055995A - Frequency offset estimation method and device - Google Patents
Frequency offset estimation method and device Download PDFInfo
- Publication number
- CN113055995A CN113055995A CN201911364944.6A CN201911364944A CN113055995A CN 113055995 A CN113055995 A CN 113055995A CN 201911364944 A CN201911364944 A CN 201911364944A CN 113055995 A CN113055995 A CN 113055995A
- Authority
- CN
- China
- Prior art keywords
- frequency offset
- offset estimation
- time slot
- current
- uplink time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/24—Testing correct operation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The application discloses a frequency offset estimation method and a device, wherein the method comprises the following steps: acquiring and determining a current configuration scene and a frequency offset estimation strategy corresponding to the current configuration scene according to scheduling configuration information of UE; and acquiring a frequency offset estimation value of the current uplink time slot according to a frequency offset estimation strategy. Based on the embodiment of the application, the optimal frequency offset estimation strategy can be selected according to different configuration scenes of the UE, and the accuracy of frequency offset estimation is ensured.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a frequency offset estimation method and apparatus.
Background
The deviation of the carrier frequency can cause error code in demodulation, and the demodulation performance of the system is seriously influenced. Especially, for the condition of a large number of constellation points under high-order QAM (Quadrature amplitude Modulation), even a small frequency offset may cause constellation point offset and further cause information misjudgment. Therefore, before demodulating the received signal, an accurate frequency offset estimation is often performed to perform frequency offset compensation.
In a wireless communication system, a frame structure for transmission typically includes pilot symbols and data symbols, where the pilot symbols are used for frequency offset estimation. In the prior art, when the pilot frequency is used for frequency offset estimation, in some configuration scenarios, the problem that the frequency offset estimation value of the current time slot cannot be calculated or the estimation accuracy is very low occurs.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
On one hand, the embodiment of the application provides a frequency offset estimation method, a frequency offset estimation device and a computer readable storage medium, which can flexibly adjust a frequency offset estimation strategy according to a current configuration scene of UE, and ensure the accuracy of frequency offset estimation.
In another aspect, an embodiment of the present application provides a frequency offset estimation method, including:
acquiring and determining a current configuration scene and a frequency offset estimation strategy corresponding to the current configuration scene according to scheduling configuration information of UE;
and acquiring a frequency offset estimation value of the current uplink time slot according to the frequency offset estimation strategy.
In another aspect, an embodiment of the present application provides an apparatus, including:
a memory for storing a program;
a processor for executing the memory-stored program, the processor being configured to perform the frequency offset estimation method as described above when the processor executes the memory-stored program.
In yet another aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions for performing the frequency offset estimation method described above.
The embodiment of the application comprises the following steps: acquiring and determining a current configuration scene and a frequency offset estimation strategy corresponding to the current configuration scene according to scheduling configuration information of UE; and acquiring a frequency offset estimation value of the current uplink time slot according to the frequency offset estimation strategy. Based on the embodiment of the application, the optimal frequency offset estimation strategy can be selected according to different configuration scenes of the UE, and the accuracy of frequency offset estimation is ensured.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is a schematic diagram of a pilot structure in a case where a subcarrier does not only include one pilot symbol or two pilot symbols consecutive in a time domain in a time slot;
fig. 2 is a schematic diagram of a pilot structure in which subcarriers are configured with only one pilot symbol in a time slot;
fig. 3 is a schematic diagram of a pilot structure in which subcarriers are configured with only two pilot symbols consecutive in the time domain in a timeslot;
fig. 4 is a flowchart of a frequency offset estimation method according to an embodiment of the present application;
fig. 5 is a sub-flowchart of step S100 in a frequency offset estimation method according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be understood that in the description of the embodiments of the present application, a plurality (or a plurality) means two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the description of "first", "second", etc. is used for the purpose of distinguishing technical features, it is not intended to indicate or imply relative importance or to implicitly indicate the number of indicated technical features or to implicitly indicate the precedence of the indicated technical features.
The deviation of the carrier frequency can cause error code in demodulation, and the demodulation performance of the system is seriously influenced. Especially for the case of a large number of constellation points, even a small frequency offset may cause the constellation points to shift, which may result in misjudgment of information. Therefore, before demodulating the received signal, an accurate frequency offset estimation and frequency offset compensation are often performed.
In a wireless communication system, a frame structure for transmission typically includes pilot symbols and data symbols, where the pilot symbols are used for frequency offset estimation. Generally, after a communication base station establishes a connection with a User Equipment (UE), a system configures a pilot scheme for the UE. Fig. 1 shows a schematic diagram of a conventional pilot structure. As shown in fig. 1, in the prior art, pilot symbols are usually inserted into data symbols in a time division multiplexing manner, and at least two pilot symbols that are discontinuous in the time domain are included in a time slot, that is, there is a data symbol between two pilot symbols, so as to obtain a larger frequency offset estimation range and a higher estimation accuracy by reasonably setting the positions of pilots in data.
It will be appreciated that the fewer pilot symbols in a slot, the more data symbols, and thus the higher the data rate in a single slot, while increasing the capacity of the base station. Therefore, in some pilot configuration scenarios, it is possible that as shown in fig. 2, a subcarrier is configured with only one pilot symbol in a time slot; it is also possible that the subcarriers in the time slot are configured with only two pilot symbols consecutive in the time domain, as shown in fig. 3, so that a larger number of streams can be obtained. The two pilot structures are particularly suitable for being applied to a New generation of 5G communication system so as to meet the requirements of high data transmission rate and large capacity of a 5G NR (5G New Radio, 5G New air interface) technology. However, these two pilot structures are disadvantageous for using the pilots to perform frequency offset estimation on the current slot because they do not satisfy the sampling requirement. If the frequency offset estimation strategy is not adjusted, the frequency offset of the current time slot cannot be estimated or the estimation precision is very low according to the traditional frequency offset estimation method.
The embodiment of the application provides a frequency offset estimation method, a frequency offset estimation device and a computer readable storage medium, which can flexibly adjust a frequency offset estimation strategy according to a current configuration scene of UE (user equipment) and ensure the accuracy of frequency offset estimation.
Fig. 4 is a flowchart illustrating a frequency offset estimation method according to an embodiment of the present application. As shown in fig. 4, the method includes the following steps.
S100, obtaining and determining a current configuration scene and a frequency offset estimation strategy corresponding to the current configuration scene according to scheduling configuration information of User Equipment (UE).
Referring to fig. 5, step S100 may include, but is not limited to, the following sub-steps.
S101, acquiring first pilot frequency information of a current uplink time slot subcarrier.
For example, the scheduling configuration information of the UE may be obtained from the base station scheduler, and corresponding pilot information may be extracted from the scheduling configuration information. The first pilot information may specifically include the number of pilot symbols and the positions of the pilot symbols of the current uplink slot. For example, the number of pilot symbols in the time slot is obtained first, and if the number of sub-carrier pilot symbols in the time slot is greater than 1, the position of each pilot symbol is further obtained.
Optionally, in step S101, when the first pilot information of the current uplink timeslot is acquired, the first pilot information may also be stored.
S102, determine whether the first pilot information only includes one pilot symbol or two continuous pilot symbols in the time domain. If the judgment result is yes, steps S103 and S104 are executed, otherwise, steps S109 and S110 are executed.
For example, based on the first pilot information obtained in step S101, it is determined whether the current uplink timeslot subcarrier only includes one pilot symbol or two pilot symbols that are consecutive in the time domain. If the judgment result is yes, steps S103 and S104 are executed. If the result of the determination is negative, it may be considered that at least two pilot symbols which are discontinuous in the time domain are included in the current uplink timeslot subcarrier, and steps S109 and S110 are executed.
S103, acquiring second pilot frequency information of the subcarrier of the previous uplink time slot.
For example, in the case that the first pilot information only includes one pilot symbol or two continuous pilot symbols in the time domain, step S103 is executed to obtain the second pilot information of the subcarrier of the previous uplink timeslot. The second pilot information may specifically include the number of pilot symbols and the positions of the pilot symbols of the previous uplink slot.
S104, determine whether the second pilot information only includes one pilot symbol or two continuous pilot symbols in the time domain. If the judgment result is yes, steps S105 and S106 are executed, otherwise steps S111 and S113 are executed.
For example, based on the second pilot information obtained in step S103, it is determined whether the second pilot information contains only one pilot symbol or two consecutive pilot symbols in the time domain. If the result of the determination is yes, that is, the subcarrier of the previous uplink timeslot only contains one pilot symbol or two pilot symbols that are consecutive in the time domain, steps S105 and S106 are performed. If the result of the determination is negative, it may be considered that the previous uplink timeslot subcarrier includes at least two pilot symbols which are discontinuous in the time domain, and steps S111 and S113 are performed.
S105, acquiring the number of overlapping RBs (Resource Block) of the current uplink slot and the previous uplink slot.
For example, the scheduling configuration information of the UE may be obtained from the base station scheduler, and the RB resource configuration information of the current uplink slot and the previous uplink slot may be extracted from the scheduling configuration information. And comparing the RB resources of the current uplink time slot and the previous uplink time slot to obtain the number of the overlapped RBs of the current uplink time slot and the previous uplink time slot.
And S106, judging whether the number of overlapped RBs of the current uplink time slot and the previous uplink time slot meets a preset threshold value. If the judgment result is yes, steps S107 and S108 are executed, otherwise, steps S112 and S113 are executed.
For example, based on the number of overlapping RBs of the current uplink timeslot and the previous uplink timeslot obtained in step S105, it is determined whether the number of overlapping RBs of the current uplink timeslot and the previous uplink timeslot meets a preset threshold. For example, assuming that the preset threshold is set to 20, if the number of overlapping RBs of the current uplink slot and the previous uplink slot is equal to or greater than 20, the number of overlapping RBs of the current uplink slot and the previous uplink slot is considered to satisfy the preset threshold. It should be understood that the optimal preset threshold value suitable for the actual communication system can be obtained by a person skilled in the art through limited experiments, and the value of the preset threshold value is not specifically required by the present application.
S107, determining that the current configuration scene is the first configuration scene.
For example, if the subcarriers of the current uplink slot and the previous uplink slot both include only one pilot symbol or two continuous pilot symbols in the time domain, and the number of overlapping RBs of the current uplink slot and the previous uplink slot satisfies a preset threshold, it is determined that the current configuration scenario is the first configuration scenario.
S108, determining a frequency offset estimation strategy corresponding to the current configuration scene as a first frequency offset estimation strategy.
For example, in the embodiment of the present application, a frequency offset estimation policy corresponding to a first configuration scenario is set as a first frequency offset estimation policy.
And S109, determining that the current configuration scene is a second configuration scene.
For example, if the current uplink timeslot includes two pilot symbols that are discontinuous in the time domain, it is determined that the current configuration scenario is the second configuration scenario.
S110, determining the frequency offset estimation strategy corresponding to the current configuration scene as a second frequency offset estimation strategy.
In the embodiment of the application, the frequency offset estimation strategy corresponding to the second configuration scenario is set as the second frequency offset estimation strategy.
And S111, determining the current configuration scene as a third configuration scene.
For example, if only one pilot symbol or two continuous pilot symbols in the subcarrier of the current uplink slot is included, and the subcarrier of the previous uplink slot includes two non-continuous pilot symbols in the time domain, it is determined that the current configuration scenario is the third configuration scenario.
And S112, determining that the current configuration scene is a fourth configuration scene.
For example, if the subcarriers of the current uplink slot and the previous uplink slot both include only one pilot symbol or two continuous pilot symbols in the time domain, and the number of overlapping RBs of the current uplink slot and the previous uplink slot cannot meet the preset threshold, it is determined that the current configuration scenario is the fourth configuration scenario.
And S113, determining the frequency offset estimation strategy corresponding to the current configuration scene as a third frequency offset estimation strategy.
In the embodiment of the application, the frequency offset estimation strategies corresponding to the third and fourth configuration scenes are set as the third frequency offset estimation strategy.
S200, obtaining a frequency offset estimation value of the current uplink time slot according to a frequency offset estimation strategy.
According to different configuration scenes, different frequency offset estimation strategies are selected to obtain a frequency offset estimation value of the current uplink time slot.
In the embodiment of the application, when the frequency offset estimation strategy is the first frequency offset estimation strategy, channel estimation values of a previous uplink time slot and a current uplink time slot are obtained, and the frequency offset estimation value of the current uplink time slot is obtained based on the channel estimation values of the previous uplink time slot and the current uplink time slot. Specifically, the pilot symbol of the previous uplink time slot may be used to obtain the channel estimation value of the previous uplink time slot, the pilot symbol of the current uplink time slot is used to obtain the channel estimation value of the current uplink time slot, then the channel estimation value of the previous uplink time slot and the channel estimation value of the current uplink time slot are averaged, and then correlation operation is performed on the obtained channel estimation average value, so as to obtain the frequency offset estimation value of the current uplink time slot. It should be noted that, since both the channel estimation based on the pilot symbols and the frequency offset estimation value obtained based on the channel estimation value belong to the active technology, they are not described herein again.
For example, if the current uplink timeslot and the previous uplink timeslot both include only one pilot symbol or two pilot symbols that are continuous in a time domain, and the number of overlapping RBs of the current uplink timeslot and the previous uplink timeslot meets a preset threshold, it is determined that the current configuration scenario is a first configuration scenario, and a frequency offset value in the current timeslot of the UE is obtained by performing frequency offset estimation between timeslots according to channel estimation values of different timeslots using a first frequency offset estimation strategy.
The frequency offset estimation method between the time slots is particularly suitable for a 5G NR system, so that the 5G NR system can be configured with fewer pilot symbols and more data symbols, and the single-user rate and the base station capacity under high-order QAM (such as 256-QAM) of the 5G NR system are greatly improved by improving the demodulation performance of UE.
It should be appreciated that the present example takes the number of overlapping RBs of the current uplink slot and the previous uplink slot as one of the determination conditions of the first configuration scenario, in order to reduce the complexity of the calculation. If the number of overlapped RBs of the current uplink timeslot and the previous uplink timeslot does not satisfy the preset threshold, it indicates that the frequency band of the RBs of the two timeslots has a large interval, which may cause a decrease in the accuracy of the calculated frequency offset estimation value and increase the complexity of the calculation, and therefore, in this scenario, it is not suitable to adopt the first frequency offset estimation strategy.
Optionally, when the channel estimation value of the current uplink time slot is obtained, the channel estimation value of the current uplink time slot is also stored, so that the frequency offset estimation value of the next uplink time slot is obtained directly by using the stored channel estimation value of the current uplink time slot under the condition that the next uplink time slot is also in the first configuration scenario.
In the embodiment of the application, when the frequency offset estimation strategy is the second frequency offset estimation strategy, at least two discontinuous pilot symbols in the current uplink time slot are used to obtain the channel estimation value of the current uplink time slot, and the frequency offset estimation value of the current uplink time slot is obtained based on the channel estimation value of the current uplink time slot. For example, the current uplink timeslot includes two discontinuous pilot symbols a and B in the time domain, a channel estimation value at the position of the pilot symbol a, and a channel estimation value a and a channel estimation value B at the position of the pilot symbol B may be obtained, and then the channel estimation value a and the channel estimation value B may be averaged to obtain a channel estimation value of the current uplink timeslot, and then a frequency offset estimation value of the current uplink timeslot is obtained based on the channel estimation value. Since obtaining the frequency offset estimation value based on the channel estimation value belongs to the prior art, the detailed description is omitted here.
In the embodiment of the application, when the frequency offset estimation strategy is the third frequency offset estimation strategy, the frequency offset estimation value of the previous uplink time slot is obtained, and the frequency offset estimation value of the previous uplink time slot is used as the frequency offset estimation value of the current uplink time slot.
Optionally, when the frequency offset estimation value of the current uplink time slot is obtained, the frequency offset estimation value is also stored, so as to facilitate the use of the next uplink and downlink time slot in frequency offset estimation.
It should be appreciated that the various embodiments of the methods provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.
In practical application, the frequency offset estimation method provided by the embodiment of the present application may be executed on the base station side. For example, a baseband processing unit, a baseband decision unit, and a baseband storage unit may be provided on the base station side. When the base station scheduler issues UE scheduling configuration information in an uplink time slot, the scheduling configuration information of the UE of the current uplink time slot is stored in the baseband storage unit so that the baseband decision unit can acquire the scheduling configuration information of the UE from the baseband storage unit, and a current configuration scene and a frequency offset estimation strategy corresponding to the current configuration scene are determined according to the scheduling configuration information of the UE. And the baseband processing unit carries out frequency offset estimation based on the determined frequency offset estimation strategy. The frequency offset estimation method provided by the embodiment of the present application is further described below by taking a specific configuration scenario as an example.
Example 1:
and initializing the baseband storage unit, wherein the initialization is mainly to perform zero clearing operation on the baseband storage unit during power-on initialization, and the zero clearing operation comprises the zero clearing of the historical scheduling configuration information, the channel estimation value and the frequency offset estimation value of the first N uplink time slots.
And when the baseband storage unit finishes initialization and the communication base station establishes cell UE access and starts to do service, the scheduler sends scheduling configuration information of the first uplink time slot to the UE, wherein the scheduling configuration information carries a pilot frequency configuration scheme. If the scheduler configures two discontinuous pilot symbols in the time domain for the UE in the current uplink time slot, the baseband decision unit determines that the current configuration scene is a second configuration scene and the corresponding frequency offset estimation strategy is a second frequency offset estimation strategy, and simultaneously feeds back the decision result to the baseband processing unit. After receiving the decision result, the baseband processing unit adopts frequency offset estimation in the time slot, that is, two discontinuous pilot symbols in the current uplink time slot are used for calculating a channel estimation value, and then the channel estimation value is used for calculating the frequency offset estimation value, and the calculated channel estimation value and frequency offset estimation value are stored in the baseband storage unit.
The scheduler issues scheduling configuration information of a second uplink time slot (which may be continuous or discontinuous with the first uplink time slot) to the UE, and if reconfiguration is not initiated, the UE continues pilot configuration of the previous uplink time slot, and then the baseband processing unit still adopts a second frequency offset estimation strategy to perform frequency offset estimation in the time slot.
If reconfiguration is initiated, and a scheme of two discontinuous pilot symbols in the time domain is switched to a scheme of only configuring one pilot symbol, assuming that the preset threshold is 20, when the baseband decision unit finds that 20 or more than 20 RBs are scheduled in the same position twice, it is determined that the current configuration scenario is a first configuration scenario and the corresponding frequency offset estimation policy is a first frequency offset estimation policy, and the decision result is fed back to the baseband processing unit. After receiving the decision result, the baseband processing unit performs inter-slot frequency offset estimation, specifically, calculates a channel estimation value of the current uplink slot by using the pilot symbol of the current uplink slot, obtains a channel estimation value of the previous uplink slot stored in the baseband storage unit, calculates a frequency offset estimation value of the current uplink slot by using the channel estimation values of the two uplink slots, and stores the channel estimation value and the frequency offset estimation value of the current uplink slot in the baseband storage unit.
Example 2:
after the baseband storage unit is initialized, the scheduler configures two pilot symbols which are discontinuous in the time domain for the UE in the first uplink time slot N, and the scheduling configuration information is stored in the baseband storage unit.
And the scheduler initiates reconfiguration in the second uplink time slot (N +1), and configures only one pilot symbol scheme for the UE, so that the baseband decision unit determines that the current configuration scenario is the third configuration scenario and the corresponding frequency offset estimation strategy is the third frequency offset estimation strategy, and simultaneously feeds back the decision result to the baseband processing unit. After receiving the decision result, the baseband processing unit obtains the frequency offset estimation value of the UE in time slot N from the baseband storage unit, and uses the frequency offset estimation value as the frequency offset estimation value of the current uplink time slot to perform frequency offset compensation.
Example 3:
after the baseband storage unit is initialized, the scheduler configures a pilot symbol for the UE in time slot N, and the scheduling configuration information is stored in the baseband storage unit.
The scheduler schedules a second uplink time slot for the UE in the time slot (N +20), and only one pilot symbol is configured for the UE, but the baseband decision unit finds that the positions of no RB are the same in the two scheduling, and then the baseband decision unit determines that the current configuration scene is a fourth configuration scene and the corresponding frequency offset estimation strategy is a third frequency offset estimation strategy, and simultaneously feeds back the decision result to the baseband processing unit. After receiving the decision result, the baseband processing unit obtains the frequency offset estimation value of the UE in time slot N from the baseband storage unit, and uses the frequency offset estimation value as the frequency offset estimation value of the current uplink time slot to perform frequency offset compensation.
Based on the technical scheme provided by the embodiment of the application, for a scene that both the current uplink time slot and the previous uplink time slot only contain one pilot symbol or two continuous pilot symbols in the time domain, and the number of overlapped RBs of the current uplink time slot and the previous uplink time slot meets a preset threshold, frequency offset estimation between time slots is carried out according to channel estimation values of different time slots to obtain a frequency offset estimation value of User Equipment (UE) in the current time slot. And for the scene that the current uplink time slot comprises two discontinuous pilot symbols on the time domain, performing inter-time-slot frequency offset estimation by using the pilot symbols of the current time slot to obtain a frequency offset estimation value of the user equipment UE at the current time slot. For the current uplink time slot, only one pilot frequency symbol or two continuous pilot frequency symbols in the time domain is contained, and the former uplink time slot contains two discontinuous pilot frequency symbols in the time domain; or, in a scenario where the current uplink time slot and the previous uplink time slot both include only one pilot symbol or two pilot symbols continuous in a time domain, but the number of overlapping RBs of the current uplink time slot and the previous uplink time slot does not satisfy a preset threshold, the frequency offset estimation value of the previous uplink time slot is used as the frequency offset estimation value of the user equipment UE in the current time slot. Therefore, the optimal frequency offset estimation strategy is selected according to different configuration scenes of the UE, and the accuracy of frequency offset estimation is ensured.
Fig. 6 illustrates an apparatus 300 provided by an embodiment of the present application. As shown in fig. 6, the apparatus 300 includes, but is not limited to:
a memory 320 for storing a program;
a processor 310 for executing the program stored in the memory 320, wherein when the processor 310 executes the program stored in the memory 320, the processor 310 is configured to perform the frequency offset estimation method described above.
The processor 310 and the memory 320 may be connected by a bus or other means.
The memory 320 is a non-transitory computer readable storage medium, and can be used to store a non-transitory software program and a non-transitory computer executable program, such as the frequency offset estimation method described in the embodiments of the present application. The processor 310 implements the frequency offset estimation method described above by executing non-transitory software programs and instructions stored in the memory 320.
The memory 320 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the stored data area may store data for performing the frequency offset estimation method described above. Further, the memory 320 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 320 may optionally include memory located remotely from processor 310, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Non-transitory software programs and instructions needed to implement the above-described frequency offset estimation method are stored in memory 320 and, when executed by the one or more processors 310, perform the above-described frequency offset estimation method, e.g., perform method steps S100 and S200 described in fig. 4, and method steps S101 to S113 described in fig. 5.
Embodiments of the present application further provide a computer-readable storage medium, which stores computer-executable instructions for performing the frequency offset estimation method.
In one embodiment, the computer-readable storage medium stores computer-executable instructions that, when executed by one or more control processors 310, e.g., by one of the processors 310 of the apparatus 300, cause the one or more processors 310 to perform the frequency offset estimation method described above, e.g., perform method steps S100 and S200 described in fig. 4, and method steps S101 to S113 described in fig. 5.
The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
One of ordinary skill in the art will appreciate that all or some of the steps, systems, and methods disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.
Claims (11)
1. A method of frequency offset estimation, comprising:
acquiring and determining a current configuration scene and a frequency offset estimation strategy corresponding to the current configuration scene according to scheduling configuration information of User Equipment (UE);
and acquiring a frequency offset estimation value of the current uplink time slot according to the frequency offset estimation strategy.
2. The method of claim 1, wherein the obtaining and determining a current configuration scenario and a frequency offset estimation policy corresponding to the current configuration scenario according to scheduling configuration information of a User Equipment (UE) comprises:
acquiring first pilot frequency information of a subcarrier in a current uplink time slot and second pilot frequency information of a subcarrier in a previous uplink time slot;
when the first pilot information only comprises one pilot symbol or two continuous pilot symbols in the time domain and the second pilot information only comprises one pilot symbol or two continuous pilot symbols in the time domain, acquiring the overlapping number of Resource Blocks (RBs) of a current uplink time slot and a previous uplink time slot;
when the number of overlapped RBs of the current uplink time slot and the previous uplink time slot meets a preset threshold, determining that the current configuration scene is a first configuration scene, and determining that the frequency offset estimation strategy corresponding to the first configuration scene is a first frequency offset estimation strategy.
3. The method of claim 2, further comprising:
when the first pilot frequency information does not only contain one pilot frequency symbol or two continuous pilot frequency symbols in the time domain, determining that the current configuration scene is a second configuration scene, and the frequency offset estimation strategy corresponding to the second configuration scene is a second frequency offset estimation strategy.
4. The method of claim 2, further comprising:
when the first pilot information only contains one pilot symbol or two continuous pilot symbols in the time domain and the second pilot information does not contain only one pilot symbol or two continuous pilot symbols in the time domain, determining that the current configuration scenario is a third configuration scenario and the frequency offset estimation strategy corresponding to the third configuration scenario is a third frequency offset estimation strategy.
5. The method of claim 2, further comprising:
and when the number of overlapped RBs of the current uplink time slot and the previous uplink time slot does not meet a preset threshold, determining that the current configuration scene is a fourth configuration scene, and the frequency offset estimation strategy corresponding to the fourth configuration scene is a third frequency offset estimation strategy.
6. The method of claim 2, wherein obtaining the frequency offset estimation value of the current uplink timeslot according to the frequency offset estimation policy comprises:
and when the frequency offset estimation strategy is the first frequency offset estimation strategy, acquiring channel estimation values of a previous uplink time slot and a current uplink time slot, and acquiring a frequency offset estimation value of the current uplink time slot based on the channel estimation values of the previous uplink time slot and the current uplink time slot.
7. The method of claim 3, wherein obtaining the frequency offset estimation value of the current uplink timeslot according to the frequency offset estimation policy comprises:
and when the frequency offset estimation strategy is the second frequency offset estimation strategy, obtaining a channel estimation value of the current uplink time slot by using at least two discontinuous pilot symbols of the current uplink time slot in the time domain, and obtaining the frequency offset estimation value of the current uplink time slot based on the channel estimation value of the current uplink time slot.
8. The method according to claim 4 or 5, wherein said obtaining a frequency offset estimation value of a current uplink timeslot according to the frequency offset estimation policy comprises:
and when the frequency offset estimation strategy is the third frequency offset estimation strategy, acquiring a frequency offset estimation value of the previous uplink time slot, and taking the frequency offset estimation value of the previous uplink time slot as the frequency offset estimation value of the current uplink time slot.
9. The method of claim 1, further comprising:
and when the frequency offset estimation value of the current uplink time slot is obtained, storing the frequency offset estimation value.
10. An apparatus, comprising:
a memory for storing a program;
a processor for executing the memory-stored program, the processor being configured to perform, when the processor executes the memory-stored program:
the method of any one of claims 1 to 9.
11. A computer-readable storage medium having stored thereon computer-executable instructions for performing:
the method of any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911364944.6A CN113055995B (en) | 2019-12-26 | 2019-12-26 | Frequency offset estimation method and device |
| PCT/CN2020/122070 WO2021129078A1 (en) | 2019-12-26 | 2020-10-20 | Frequency offset estimation method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911364944.6A CN113055995B (en) | 2019-12-26 | 2019-12-26 | Frequency offset estimation method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113055995A true CN113055995A (en) | 2021-06-29 |
| CN113055995B CN113055995B (en) | 2023-10-27 |
Family
ID=76506005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911364944.6A Active CN113055995B (en) | 2019-12-26 | 2019-12-26 | Frequency offset estimation method and device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN113055995B (en) |
| WO (1) | WO2021129078A1 (en) |
Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1098482A2 (en) * | 1999-11-05 | 2001-05-09 | Nec Corporation | Method and System for correcting frequency offset using pilot signals |
| US6606363B1 (en) * | 1999-12-28 | 2003-08-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for estimating a frequency offset by combining pilot symbols and data symbols |
| CN102014097A (en) * | 2009-09-04 | 2011-04-13 | 中兴通讯股份有限公司 | Receiving terminal as well as fast frequency offset estimation device and method |
| CN102035764A (en) * | 2009-09-24 | 2011-04-27 | 中兴通讯股份有限公司 | Channel estimation device and channel estimation method of nonideal synchronous single-carrier frequency division multiple access system |
| CN102130864A (en) * | 2010-01-20 | 2011-07-20 | 中兴通讯股份有限公司 | Channel estimation method and device |
| CN102457452A (en) * | 2010-10-19 | 2012-05-16 | 中兴通讯股份有限公司 | Method for calculating frequency offset estimated value and channel estimated value and LTE base station |
| CN102594740A (en) * | 2011-01-11 | 2012-07-18 | 中兴通讯股份有限公司 | Method and device for estimating frequency offset |
| CN102739572A (en) * | 2011-04-15 | 2012-10-17 | 中兴通讯股份有限公司 | Method and system for improving channel estimation performance |
| CN103338508A (en) * | 2013-07-10 | 2013-10-02 | 武汉邮电科学研究院 | Method and system for jointly estimating frequency offset |
| CN103873396A (en) * | 2014-03-21 | 2014-06-18 | 电信科学技术研究院 | Frequency offset estimation and compensation method and device |
| CN104283822A (en) * | 2013-07-08 | 2015-01-14 | 普天信息技术研究院有限公司 | Frequency offset estimation and compensation method |
| CN104348516A (en) * | 2013-07-30 | 2015-02-11 | 上海摩波彼克半导体有限公司 | A method and a device for estimating frequency offset of a user terminal, and a user terminal |
| CN104639479A (en) * | 2015-02-03 | 2015-05-20 | 大唐移动通信设备有限公司 | Frequency offset calibration method and equipment |
| WO2017016303A1 (en) * | 2015-07-29 | 2017-02-02 | 中兴通讯股份有限公司 | Method and apparatus for pre-compensating frequency offset |
| CN106506412A (en) * | 2015-09-07 | 2017-03-15 | 中兴通讯股份有限公司 | A kind of method and device of offset estimation |
| CN107040295A (en) * | 2016-01-30 | 2017-08-11 | 华为技术有限公司 | Uplink frequency offset method of estimation, relevant device and system in MU-MIMO system |
| CN107426123A (en) * | 2017-07-17 | 2017-12-01 | 北京睿信丰科技有限公司 | One kind carries out joint integer frequency bias method of estimation and device using more intersymbol pilot tones |
| WO2018040056A1 (en) * | 2016-09-01 | 2018-03-08 | 华为技术有限公司 | Frequency shift correction method and related device |
| WO2018132199A1 (en) * | 2017-01-16 | 2018-07-19 | Qualcomm Incorporated | Signaling methods for frequency offset estimation using reference signals |
| CN109274619A (en) * | 2017-07-18 | 2019-01-25 | 电信科学技术研究院 | A kind of frequency shift (FS) determines method and device |
| CN109495409A (en) * | 2018-12-29 | 2019-03-19 | 京信通信系统（中国）有限公司 | Channel estimation methods, device, radio receiver and storage medium |
| CN109688075A (en) * | 2019-01-16 | 2019-04-26 | 武汉虹信通信技术有限责任公司 | A kind of channel estimation methods and device of wireless communication |
| CN109756435A (en) * | 2017-11-07 | 2019-05-14 | 北京中科晶上科技股份有限公司 | A kind of frequency deviation estimating method of pair of signal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101525931B1 (en) * | 2013-07-24 | 2015-06-04 | 성균관대학교산학협력단 | Frequency offset estimation method in ofdm system and ofdm receiver |
| CN103441969B (en) * | 2013-09-12 | 2016-08-17 | 西安电子科技大学 | The carrier frequency bias estimation of pilot frequency space variable |
| WO2015154213A1 (en) * | 2014-04-07 | 2015-10-15 | Intel IP Corporation | Client specific frequency offset estimation copyright notice |
| CN110098903B (en) * | 2018-01-30 | 2021-10-22 | 普天信息技术有限公司 | Uplink pilot frequency transmission method, user equipment and base station |
-
2019
- 2019-12-26 CN CN201911364944.6A patent/CN113055995B/en active Active
-
2020
- 2020-10-20 WO PCT/CN2020/122070 patent/WO2021129078A1/en active Application Filing
Patent Citations (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1098482A2 (en) * | 1999-11-05 | 2001-05-09 | Nec Corporation | Method and System for correcting frequency offset using pilot signals |
| US6606363B1 (en) * | 1999-12-28 | 2003-08-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for estimating a frequency offset by combining pilot symbols and data symbols |
| CN102014097A (en) * | 2009-09-04 | 2011-04-13 | 中兴通讯股份有限公司 | Receiving terminal as well as fast frequency offset estimation device and method |
| CN102035764A (en) * | 2009-09-24 | 2011-04-27 | 中兴通讯股份有限公司 | Channel estimation device and channel estimation method of nonideal synchronous single-carrier frequency division multiple access system |
| CN102130864A (en) * | 2010-01-20 | 2011-07-20 | 中兴通讯股份有限公司 | Channel estimation method and device |
| CN102457452A (en) * | 2010-10-19 | 2012-05-16 | 中兴通讯股份有限公司 | Method for calculating frequency offset estimated value and channel estimated value and LTE base station |
| CN102594740A (en) * | 2011-01-11 | 2012-07-18 | 中兴通讯股份有限公司 | Method and device for estimating frequency offset |
| CN102739572A (en) * | 2011-04-15 | 2012-10-17 | 中兴通讯股份有限公司 | Method and system for improving channel estimation performance |
| CN104283822A (en) * | 2013-07-08 | 2015-01-14 | 普天信息技术研究院有限公司 | Frequency offset estimation and compensation method |
| CN103338508A (en) * | 2013-07-10 | 2013-10-02 | 武汉邮电科学研究院 | Method and system for jointly estimating frequency offset |
| CN104348516A (en) * | 2013-07-30 | 2015-02-11 | 上海摩波彼克半导体有限公司 | A method and a device for estimating frequency offset of a user terminal, and a user terminal |
| CN103873396A (en) * | 2014-03-21 | 2014-06-18 | 电信科学技术研究院 | Frequency offset estimation and compensation method and device |
| WO2015139590A1 (en) * | 2014-03-21 | 2015-09-24 | 电信科学技术研究院 | Frequency offset estimation and compensation method and device |
| CN104639479A (en) * | 2015-02-03 | 2015-05-20 | 大唐移动通信设备有限公司 | Frequency offset calibration method and equipment |
| WO2017016303A1 (en) * | 2015-07-29 | 2017-02-02 | 中兴通讯股份有限公司 | Method and apparatus for pre-compensating frequency offset |
| CN106506412A (en) * | 2015-09-07 | 2017-03-15 | 中兴通讯股份有限公司 | A kind of method and device of offset estimation |
| CN107040295A (en) * | 2016-01-30 | 2017-08-11 | 华为技术有限公司 | Uplink frequency offset method of estimation, relevant device and system in MU-MIMO system |
| WO2018040056A1 (en) * | 2016-09-01 | 2018-03-08 | 华为技术有限公司 | Frequency shift correction method and related device |
| WO2018132199A1 (en) * | 2017-01-16 | 2018-07-19 | Qualcomm Incorporated | Signaling methods for frequency offset estimation using reference signals |
| CN107426123A (en) * | 2017-07-17 | 2017-12-01 | 北京睿信丰科技有限公司 | One kind carries out joint integer frequency bias method of estimation and device using more intersymbol pilot tones |
| CN109274619A (en) * | 2017-07-18 | 2019-01-25 | 电信科学技术研究院 | A kind of frequency shift (FS) determines method and device |
| CN109756435A (en) * | 2017-11-07 | 2019-05-14 | 北京中科晶上科技股份有限公司 | A kind of frequency deviation estimating method of pair of signal |
| CN109495409A (en) * | 2018-12-29 | 2019-03-19 | 京信通信系统（中国）有限公司 | Channel estimation methods, device, radio receiver and storage medium |
| CN109688075A (en) * | 2019-01-16 | 2019-04-26 | 武汉虹信通信技术有限责任公司 | A kind of channel estimation methods and device of wireless communication |
Non-Patent Citations (2)
| Title |
|---|
| ""R1-1908049"", 3GPP TSG_RAN\\WG1_RL1 * |
| MEDIATEK INC.: "R1-1704470 "On the reference signal for fine time and frequency tracking"", 3GPP TSG_RAN\\WG1_RL1, no. 1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021129078A1 (en) | 2021-07-01 |
| CN113055995B (en) | 2023-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6333892B2 (en) | Terminal apparatus and method for controlling uplink signal transmission power | |
| US8571593B2 (en) | Apparatus and method for uplink power control in wireless communication system | |
| EP2741552B1 (en) | Terminal, communication system, and communication method | |
| US10945221B2 (en) | Power headroom configuration for primary and secondary cells based on PUCCH activation | |
| WO2011052312A1 (en) | Wireless communication system, base station apparatus, mobile station apparatus, wireless communication method, mobile station apparatus control program, and integrated circuits of base station apparatus and mobile station apparatus | |
| CN110381527B (en) | Power headroom reporting method, TPC command sending method and device, base station and terminal | |
| US8812044B2 (en) | Apparatus and method for controlling data transmission rate in broadband wireless communication system | |
| US8830859B2 (en) | Power based gain control adjustment | |
| EP2433447A2 (en) | Power headroom reporting for carrier aggregation | |
| US9198166B2 (en) | Wireless communication system, base station, mobile station, and wireless communication method | |
| US20130142177A1 (en) | Method and apparatus for adjacent-channel emission limit depending on synchronization of interfered receiver | |
| US8774120B2 (en) | Techniques for improving control channel acquisition in a wireless communication system | |
| CN109996323B (en) | Transmission power determining method and device and transmission demodulation method and device | |
| US20190159139A1 (en) | Terminal apparatus, base station apparatus, and communication method | |
| EP2672772A1 (en) | Wireless communication system, base station, mobile station, and wireless communication method | |
| US10390349B2 (en) | 256 QAM-based resource allocation method and base station thereof | |
| JP7319451B2 (en) | GAIN ADJUSTMENT CONTROL METHOD, APPARATUS, DEVICE, AND COMPUTER-READABLE STORAGE MEDIUM | |
| US9781720B2 (en) | Component carrier (de)activation in communication systems using carrier aggregation | |
| US20110228825A1 (en) | Base station apparatus and communication method | |
| US20080225787A1 (en) | Resource allocation method and system | |
| CN113055995B (en) | Frequency offset estimation method and device | |
| CN114124294A (en) | Adaptive modulation coding method, base station and storage medium | |
| US20140286318A1 (en) | Scheduling method and scheduling device | |
| JP5020419B2 (en) | Wireless communication system, wireless communication method, mobile station apparatus, and integrated circuit | |
| WO2024011129A1 (en) | Signaling patterns for time drift reference signals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |