CN113765840A - Method and device for frequency offset precompensation - Google Patents
Method and device for frequency offset precompensation Download PDFInfo
- Publication number
- CN113765840A CN113765840A CN202010506932.9A CN202010506932A CN113765840A CN 113765840 A CN113765840 A CN 113765840A CN 202010506932 A CN202010506932 A CN 202010506932A CN 113765840 A CN113765840 A CN 113765840A
- Authority
- CN
- China
- Prior art keywords
- frequency offset
- terminal
- value
- downlink
- compensation
- 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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
- H04L27/266—Fine or fractional frequency offset determination and synchronisation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The application discloses a method and a device for frequency offset precompensation, wherein the method comprises the following steps: acquiring a downlink frequency offset estimation value of each terminal in a scheduled terminal, and generating a downlink frequency offset precompensation value of each terminal; calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal; according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, respectively carrying out frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval; and according to the unified frequency offset compensation value, performing frequency offset pre-compensation on the downlink data of the scheduled terminal in a time domain. The method provided by the embodiment of the application can realize higher frequency offset precompensation precision and reduce the complexity of frequency offset precompensation operation.
Description
Technical Field
The present application relates to the field of mobile communications technologies, and in particular, to a method and an apparatus for frequency offset precompensation.
Background
In a fourth generation or fifth generation mobile communication system, there are some high-speed mobile scenarios, such as high-speed rail, highway, etc., the moving speed of a User Equipment (UE) is very fast, and a relatively large frequency offset may exist between a base station and the UE.
The large fixed frequency offset may cause severe Inter-Carrier Interference (ISI), which may affect the demodulation performance of the UE. In order to solve the problem caused by the fixed frequency offset, when the base station side sends a downlink signal, frequency offset pre-compensation (or pre-distortion) can be performed to compensate the fixed frequency offset existing between the base station and the UE in advance, so that the fixed frequency offset of the signal actually received by the UE will be reduced, and the demodulation performance of the UE is improved.
Disclosure of Invention
At least one embodiment of the present application provides a method and an apparatus for frequency offset precompensation, which achieve higher frequency offset precompensation precision and reduce complexity of frequency offset precompensation operation.
In a first aspect, the present application provides a method for frequency offset pre-compensation, including:
acquiring a downlink frequency offset estimation value of each terminal in a scheduled terminal, and generating a downlink frequency offset precompensation value of each terminal;
calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal;
according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, respectively carrying out frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval;
and according to the unified frequency offset compensation value, performing frequency offset pre-compensation on the downlink data of the scheduled terminal in a time domain.
With reference to the first aspect, in some implementations of the first aspect, the step of obtaining a downlink frequency offset estimate of each terminal in the scheduled terminals includes:
and measuring an uplink reference signal sent by each terminal to obtain an uplink frequency offset estimation value of the terminal, wherein the uplink frequency offset estimation value is used as a downlink frequency offset estimation value of the terminal.
With reference to the first aspect, in some implementations of the first aspect, the generating a downlink frequency offset pre-compensation value for each terminal includes:
and calculating to obtain a downlink frequency offset precompensation value of the terminal according to the downlink frequency offset estimation value of the terminal and a preset first adjustment coefficient.
With reference to the first aspect, in some implementation manners of the first aspect, the step of calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset pre-compensation value of each terminal includes:
and calculating the average value of the downlink frequency offset precompensation values of the scheduled terminal, and calculating to obtain the uniform frequency offset compensation value according to the calculated average value and a preset second adjustment coefficient.
With reference to the first aspect, in some implementation manners of the first aspect, the step of performing frequency offset precompensation on the downlink data of each terminal in the first class of terminals in the frequency domain according to a difference value between the downlink frequency offset precompensation value of the terminal and the uniform frequency offset compensation value includes:
aiming at each terminal in the first class of terminals, respectively generating a convolution coefficient corresponding to the terminal according to a difference value between a downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value;
and carrying out convolution calculation on the downlink frequency domain data of the terminal by utilizing the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
With reference to the first aspect, in some implementation manners of the first aspect, the performing, in a time domain, frequency offset pre-compensation on the downlink data of the scheduled terminal according to the unified frequency offset compensation value includes:
generating a time domain compensation quantity corresponding to each time domain sampling point according to the unified frequency offset compensation value;
and performing complex dot product operation on the downlink time domain data of the scheduled terminal by using the time domain compensation quantity to obtain the downlink time domain data after the frequency offset compensation of the scheduled terminal.
In a second aspect, the present application provides a network side device, including: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor;
the processor implements the following steps when executing the program:
acquiring a downlink frequency offset estimation value of each terminal in a scheduled terminal, and generating a downlink frequency offset precompensation value of each terminal;
calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal;
according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, respectively carrying out frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval;
and according to the unified frequency offset compensation value, performing frequency offset pre-compensation on the downlink data of the scheduled terminal in a time domain.
With reference to the second aspect, in some implementations of the second aspect, the processor executes the program to further implement the following steps:
when acquiring the downlink frequency offset estimation value of each terminal in the scheduled terminal, measuring the uplink reference signal sent by each terminal, and acquiring the uplink frequency offset estimation value of the terminal as the downlink frequency offset estimation value of the terminal.
With reference to the second aspect, in some implementations of the second aspect, the processor executes the program to further implement the following steps:
and when the downlink frequency offset precompensation value of each terminal is generated, calculating to obtain the downlink frequency offset precompensation value of the terminal according to the downlink frequency offset estimation value of the terminal and a preset first adjustment coefficient.
With reference to the second aspect, in some implementations of the second aspect, the processor executes the program to further implement the following steps:
when the unified frequency offset compensation value of the scheduled terminal is calculated according to the downlink frequency offset precompensation value of each terminal, calculating the average value of the downlink frequency offset precompensation values of the scheduled terminal, and calculating to obtain the unified frequency offset compensation value according to the calculated average value and a preset second adjustment coefficient.
With reference to the second aspect, in some implementations of the second aspect, the processor executes the program to further implement the following steps:
when the frequency offset precompensation is carried out on the downlink data of each terminal in the first class of terminals in the frequency domain according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, aiming at each terminal in the first class of terminals, a convolution coefficient corresponding to the terminal is generated according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value; and carrying out convolution calculation on the downlink frequency domain data of the terminal by utilizing the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
With reference to the second aspect, in some implementations of the second aspect, the processor executes the program to further implement the following steps:
when the downlink data of the scheduled terminal is subjected to frequency offset pre-compensation in the time domain according to the unified frequency offset compensation value, generating a time domain compensation quantity corresponding to each time domain sampling point according to the unified frequency offset compensation value;
and performing complex dot product operation on the downlink time domain data of the scheduled terminal by using the time domain compensation quantity to obtain the downlink time domain data after the frequency offset compensation of the scheduled terminal.
In a third aspect, the present application provides a frequency offset pre-compensation apparatus, including:
the frequency offset estimation unit is used for acquiring a downlink frequency offset estimation value of each terminal in the scheduled terminal and generating a downlink frequency offset precompensation value of each terminal;
the unified frequency offset compensation calculating unit is used for calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset pre-compensation value of each terminal;
a first pre-compensation unit, configured to perform frequency offset pre-compensation on downlink data of each terminal in a first class of terminals in a frequency domain according to a difference between a downlink frequency offset pre-compensation value of the terminal and the uniform frequency offset compensation value, where the first class of terminals are terminals whose difference in the scheduled terminals exceeds a preset interval;
and the second pre-compensation unit is used for performing frequency offset pre-compensation on the downlink data of the scheduled terminal in the time domain according to the unified frequency offset compensation value.
With reference to the second aspect, in some implementation manners of the second aspect, the frequency offset estimation unit is further configured to calculate a downlink frequency offset precompensation value of the terminal according to the downlink frequency offset estimation value of the terminal and a preset first adjustment coefficient.
With reference to the second aspect, in some implementation manners of the second aspect, the unified frequency offset compensation calculating unit is further configured to calculate an average value of downlink frequency offset precompensation values of the scheduled terminal, and calculate to obtain the unified frequency offset compensation value according to the calculated average value and a preset second adjustment coefficient.
With reference to the second aspect, in some implementation manners of the second aspect, the first pre-compensation unit is further configured to, for each terminal in the first class of terminals, generate a convolution coefficient corresponding to the terminal according to a difference between a downlink frequency offset pre-compensation value of the terminal and the unified frequency offset compensation value; and carrying out convolution calculation on the downlink frequency domain data of the terminal by utilizing the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
With reference to the second aspect, in some implementation manners of the second aspect, the second pre-compensation unit is further configured to generate a time domain compensation amount corresponding to each time domain sample point according to the unified frequency offset compensation value; and performing complex dot product operation on the downlink time domain data of the scheduled terminal by using the time domain compensation quantity to obtain the downlink time domain data after the frequency offset compensation of the scheduled terminal.
In a third aspect, the present application provides a network side device, including: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor;
the processor implements the following steps when executing the program:
acquiring a downlink frequency offset estimation value of each terminal in a scheduled terminal, and generating a downlink frequency offset precompensation value of each terminal;
calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal;
according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, respectively carrying out frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval;
and according to the unified frequency offset compensation value, performing frequency offset pre-compensation on the downlink data of the scheduled terminal in a time domain.
In a fourth aspect, the present application provides a computer storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method as described above.
The beneficial effects of the embodiment of the application are that: the embodiment of the application additionally executes the convolution calculation of frequency domain frequency offset precompensation on the first class of terminals in the scheduled terminals, so that the terminals with larger frequency offset difference can perform additional frequency offset compensation, the problem of insufficient time frequency offset compensation only by adopting uniform frequency offset precompensation is solved, and the data demodulation performance of the terminals can be improved. In addition, because the convolution calculation is only performed on part of the terminals, not all the terminals, the embodiment of the application can reduce the operation complexity of frequency offset compensation and achieve higher frequency offset pre-compensation precision.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic diagram of a wireless communication system suitable for use in embodiments of the present application;
FIG. 2 is a flow chart of a method for frequency offset pre-compensation according to an embodiment of the present application;
fig. 3 is a flowchart of an apparatus for pre-compensating frequency offset according to an embodiment of the present application;
fig. 4 is a structural diagram of a network-side device according to an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. 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. In the description and in the claims "and/or" means at least one of the connected objects.
The technology described herein is not limited to Long Time Evolution (LTE), LTE-Advanced (LTE-a) and 5G NR systems, and may also be used for other various wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA), and new communication systems that will emerge in the future. The terms "system" and "network" are often used interchangeably. CDMA systems may implement Radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), and so on. UTRA includes Wideband CDMA (Wideband Code Division Multiple Access, WCDMA) and other CDMA variants. TDMA systems may implement radio technologies such as Global System for Mobile communications (GSM). The OFDMA system may implement radio technologies such as Ultra Mobile Broadband (UMB), evolved-UTRA (E-UTRA), IEEE 802.21(Wi-Fi), IEEE 802.16(WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). LTE and higher LTE (e.g., LTE-A) are new UMTS releases that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation Partnership Project" (3 GPP). CDMA2000 and UMB are described in documents from an organization named "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for both the above-mentioned systems and radio technologies, as well as for other systems and radio technologies. However, the following description describes the NR system for purposes of example, and NR terminology is used in much of the description below, although the techniques may also be applied to applications other than NR system applications.
The following description provides examples and does not limit the scope, applicability, or configuration set forth in the claims. Changes may be made in the function and arrangement of elements discussed without departing from the spirit and scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the described methods may be performed in an order different than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
Referring to fig. 1, fig. 1 is a block diagram of a wireless communication system to which an embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 may also be referred to as a User terminal or a User Equipment (UE), where the terminal 11 may be a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or a vehicle-mounted Device, and the specific type of the terminal 11 is not limited in this embodiment. The network-side device 12 may be a Base Station and/or a core network element, wherein the Base Station may be a 5G or later-version Base Station (e.g., a gNB, a 5G NR NB, etc.), or a Base Station in other communication systems (e.g., an eNB, a WLAN access point, or other access points, etc.), wherein the Base Station may be referred to as a node B, an evolved node B, an access point, a Base Transceiver Station (BTS), a radio Base Station, a radio Transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a node B, an evolved node B (eNB), a home node B, a home evolved node B, a WLAN access point, a WiFi node, or some other suitable terminology in the field, as long as the same technical effect is achieved, the Base Station is not limited to a specific technical vocabulary, it should be noted that, in the embodiment of the present application only takes the Base Station in the NR system as an example, but does not limit the specific type of base station.
The base stations may communicate with the terminals 11 under the control of a base station controller, which may be part of the core network or some of the base stations in various examples. Some base stations may communicate control information or user data with the core network through a backhaul. In some examples, some of the base stations may communicate with each other, directly or indirectly, over backhaul links, which may be wired or wireless communication links. A wireless communication system may support operation on multiple carriers (waveform signals of different frequencies). A multi-carrier transmitter can transmit modulated signals on the multiple carriers simultaneously. For example, each communication link may be a multi-carrier signal modulated according to various radio technologies. Each modulated signal may be transmitted on a different carrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, data, and so on.
The base station may communicate wirelessly with the terminal 11 via one or more access point antennas. Each base station may provide communication coverage for a respective coverage area. The coverage area of an access point may be divided into sectors that form only a portion of the coverage area. A wireless communication system may include different types of base stations (e.g., macro, micro, or pico base stations). The base stations may also utilize different radio technologies, such as cellular or WLAN radio access technologies. The base stations may be associated with the same or different access networks or operator deployments. The coverage areas of different base stations (including coverage areas of base stations of the same or different types, coverage areas utilizing the same or different radio technologies, or coverage areas belonging to the same or different access networks) may overlap.
The communication link in the wireless communication system may include an Uplink for carrying Uplink (UL) transmission (e.g., from the terminal 11 to the network side device 12) or a Downlink for carrying Downlink (DL) transmission (e.g., from the network device 12 to the terminal 11). The UL transmission may also be referred to as reverse link transmission, while the DL transmission may also be referred to as forward link transmission. Downlink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both. Similarly, uplink transmissions may be made using licensed frequency bands, unlicensed frequency bands, or both.
As described in the background, when the base station side transmits a downlink signal, pre-compensation (or referred to as pre-distortion) of frequency offset may be performed to improve demodulation performance of the UE. The method is characterized in that frequency deviation is pre-compensated on the base station side, one method is to compensate in a time domain, namely, the phase generated by the frequency deviation in the time domain is compensated, the method needs to carry out N times of complex multiplication operations, wherein N is the number of time domain sampling points; the method has the advantages of relatively simple operation and the disadvantages that the method assumes that the frequency offsets of all the UE are the same, and needs to carry out frequency offset pre-compensation on all the UE as a whole, and is not flexible and accurate.
In order to solve at least one of the above problems, an embodiment of the present application provides a scheme for frequency offset pre-compensation based on time domain and frequency domain combination, which can reduce the complexity of operation while satisfying higher frequency offset pre-compensation accuracy.
Referring to fig. 2, an embodiment of the present application provides a method for frequency offset pre-compensation, which can be applied to the network side device shown in fig. 1, and the method includes:
step 21, obtaining the downlink frequency offset estimation value of each terminal in the scheduled terminal, and generating the downlink frequency offset precompensation value of each terminal.
Here, the scheduled terminal refers to a terminal to which the network side device schedules downlink transmission. The network side device may measure the uplink reference signal sent by each terminal, and obtain an uplink frequency offset estimation value of the terminal, which is used as a downlink frequency offset estimation value of the terminal. Specifically, the Uplink Reference Signal may be a Sounding Reference Signal (SRS), a Physical Uplink Shared Channel (PUSCH) Signal, or other signals.
After obtaining the downlink frequency offset estimation value of the terminal, the downlink frequency offset precompensation value of the terminal can be obtained through calculation according to the downlink frequency offset estimation value and a preset first adjustment coefficient. Generally, when the downlink frequency offset estimation value is a positive value, the downlink frequency offset pre-compensation value is a negative value; when the downlink frequency offset estimation value is a negative value, the downlink frequency offset pre-compensation value is a positive value. The first adjustment factor may be a negative number, typically a value between-1 and 0.
For example, the base station obtains the downlink frequency offset precompensation value of each terminal through uplink measurement, and records the downlink frequency offset precompensation values as fo (i), wherein i is the index of the terminal; then, the base station calculates the frequency offset pre-compensation value fc (i) of each terminal according to the parameters such as fo (i) and the first adjustment coefficient a1, and the calculation method is as follows:
FC(i)＝-FO(i)*A1
and step 22, calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal.
Here, after obtaining the downlink frequency offset pre-compensation value of each terminal in the scheduled terminals, in the embodiment of the present application, a unified frequency offset compensation value is obtained through calculation, specifically, an average value of the downlink frequency offset pre-compensation values of the scheduled terminals may be calculated, and the unified frequency offset compensation value is obtained through calculation according to the calculated average value and a preset second adjustment coefficient. Here, the second adjustment factor may be a positive number, typically a value between 0 and 1.
Considering that there may be a large error in the downlink frequency offset precompensation values of some terminals obtained through calculation, in order to improve the accuracy of the unified frequency offset compensation value, in the embodiment of the present application, when the average value is calculated, the downlink frequency offset precompensation values of the scheduled terminal may be sorted according to the magnitude of the values to obtain a value queue, then M1 downlink frequency offset precompensation values at the head of the queue in the value queue are removed, M2 downlink frequency offset precompensation values at the tail of the queue are removed, and then the average value is calculated for the remaining downlink frequency offset precompensation values. The M1 and the M2 are preset positive integers. For example, 2 values at the head of the queue and 3 values at the tail of the queue are removed from the queue of the downlink frequency offset precompensation value of the scheduled terminal, and then the remaining values in the queue are averaged.
Continuing with the previous example, the base station calculates the unified frequency offset compensation value FA according to the parameters fc (i) and the second adjustment coefficient value a2, and the calculation method is as follows:
where M represents the number of terminals participating in the average calculation.
And step 23, respectively performing frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval.
Here, in the embodiment of the present application, a difference value between the downlink frequency offset pre-compensation value of each terminal and the unified frequency offset compensation value is calculated, and a terminal whose difference value exceeds a preset interval is selected as the first class terminal. Then, aiming at each terminal in the first class of terminals, respectively generating a convolution coefficient corresponding to the terminal according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value; and then, carrying out convolution calculation on the downlink frequency domain data of the terminal by using the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal. When the first type terminal is selected, whether the difference value exceeds a preset interval can be judged according to whether the absolute value of the difference value is larger than a certain preset threshold.
Specifically, for each terminal in the first class of terminals, a time domain phase compensation value corresponding to a time domain sample point may be generated according to a difference value fd (i) between a downlink frequency offset pre-compensation value of the terminal and the unified frequency offset compensation value; then, performing fast Fourier transform on the time domain phase compensation value to obtain a convolution coefficient of a frequency domain; and performing convolution calculation on the downlink frequency domain data of the terminal by using the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
For example, the convolution coefficient C (i, j) corresponding to the terminal i in the first class of terminals may be generated according to the following formula:
j is a convolution coefficient index, k is a frequency domain subcarrier index, fd (i) is a difference value between a downlink frequency offset precompensation value of the terminal i and the uniform frequency offset compensation value, and N is a fast fourier transform point number.
Then, performing convolution calculation on the downlink frequency domain data x (k) of the terminal i in the frequency domain to obtain downlink frequency domain data y (k) after the terminal frequency offset compensation:
and step 24, performing frequency offset precompensation on the downlink data of the scheduled terminal in a time domain according to the unified frequency offset compensation value.
Here, in the embodiment of the present application, a time domain compensation amount corresponding to each time domain sampling point is generated according to the unified frequency offset compensation value; then, by using the time domain compensation amount, performing complex point multiplication operation on the downlink time domain data of the scheduled terminal including the first class terminal to obtain the downlink time domain data after frequency offset compensation of the scheduled terminal.
Specifically, Inverse Fast Fourier Transform (IFFT) may be performed on the downlink frequency domain data of the scheduled terminal to transform to a time domain, so as to obtain downlink time domain data y (n) of the scheduled terminal, where n is a time domain sampling point index; then, according to the uniform frequency offset compensation value FA, generating a time domain compensation quantity S (n) corresponding to each time domain sampling point:
then, performing complex number dot product operation according to the following formula to obtain the downlink time domain data r (n) after the frequency offset compensation of the scheduled terminal.
R(n)＝Y(n)*S(n)
It can be seen from the above steps that, in the embodiment of the present application, the convolution calculation of the frequency domain frequency offset precompensation in step 23 is additionally performed on the first class of terminals in the scheduled terminals, so that the terminals with larger frequency offset difference can perform additional frequency offset compensation, the problem of insufficient time-frequency offset compensation caused by only adopting uniform frequency offset precompensation is solved, and the data demodulation performance of the terminals of this class can be improved. In addition, because the convolution calculation is only performed on part of the terminals, not all the terminals, the embodiment of the application can reduce the operation complexity of frequency offset compensation and achieve higher frequency offset pre-compensation precision.
In addition, after step 24, the base station may further send the downlink time domain data r (n) after the frequency offset compensation of the scheduled terminal.
Various methods of embodiments of the present application are described above. An apparatus for carrying out the above method is further provided below.
Referring to fig. 3, an embodiment of the present application provides a frequency offset precompensation apparatus 30, which can be applied to a network side device, as shown in fig. 3, the frequency hopping apparatus 30 includes:
a frequency offset estimation unit 31, configured to obtain a downlink frequency offset estimation value of each terminal in the scheduled terminals, and generate a downlink frequency offset precompensation value of each terminal;
a unified frequency offset compensation calculating unit 32, configured to calculate a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset pre-compensation value of each terminal;
a first pre-compensation unit 33, configured to perform frequency offset pre-compensation on downlink data of each terminal in a first class of terminals in a frequency domain according to a difference between a downlink frequency offset pre-compensation value of the terminal and the uniform frequency offset compensation value, where the first class of terminals are terminals whose difference in the scheduled terminals exceeds a preset interval;
and a second pre-compensation unit 34, configured to perform frequency offset pre-compensation on the downlink data of the scheduled terminal in the time domain according to the unified frequency offset compensation value.
Through the modules, the method and the device can reduce the operation complexity of frequency offset compensation and achieve higher frequency offset pre-compensation precision.
Optionally, the frequency offset estimation unit 31 is further configured to measure an uplink reference signal sent by each terminal, and obtain an uplink frequency offset estimation value of the terminal, which is used as a downlink frequency offset estimation value of the terminal.
Optionally, the frequency offset estimation unit 31 is further configured to calculate a downlink frequency offset precompensation value of the terminal according to the downlink frequency offset estimation value of the terminal and a preset first adjustment coefficient.
Optionally, the unified frequency offset compensation calculating unit 32 is further configured to calculate an average value of downlink frequency offset precompensation values of the scheduled terminal, and calculate to obtain the unified frequency offset compensation value according to the calculated average value and a preset second adjustment coefficient.
Optionally, the first pre-compensation unit 33 is further configured to, for each terminal in the first class of terminals, generate a convolution coefficient corresponding to the terminal according to a difference between a downlink frequency offset pre-compensation value of the terminal and the uniform frequency offset compensation value; and carrying out convolution calculation on the downlink frequency domain data of the terminal by utilizing the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
Optionally, the second pre-compensation unit 34 is further configured to generate a time domain compensation amount corresponding to each time domain sampling point according to the unified frequency offset compensation value; and performing complex dot product operation on the downlink time domain data of the scheduled terminal by using the time domain compensation quantity to obtain the downlink time domain data after the frequency offset compensation of the scheduled terminal.
It should be noted that the apparatus in this embodiment is an apparatus corresponding to the method shown in fig. 2, and the implementation manners in the above embodiments are all applicable to the embodiment of the apparatus, and the same technical effects can be achieved. It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.
Referring to fig. 4, an embodiment of the present application provides a schematic structural diagram of a network-side device 400, including: a processor 401, a transceiver 402, a memory 403, and a bus interface, wherein:
in this embodiment, the network-side device 400 further includes: a program stored in a memory 403 and executable on a processor 401, which when executed by the processor 401 performs the steps of:
acquiring a downlink frequency offset estimation value of each terminal in a scheduled terminal, and generating a downlink frequency offset precompensation value of each terminal;
calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal;
according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, respectively carrying out frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval;
and according to the unified frequency offset compensation value, performing frequency offset pre-compensation on the downlink data of the scheduled terminal in a time domain.
It can be understood that, in the embodiment of the present application, when being executed by the processor 401, the computer program can implement each process of the above-mentioned method embodiment of frequency offset precompensation shown in fig. 2, and can achieve the same technical effect, and for avoiding repetition, details are not described here again.
In FIG. 4, the bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 401, and various circuits, represented by memory 403, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 402 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.
The processor 401 is responsible for managing the bus architecture and general processing, and the memory 403 may store data used by the processor 401 in performing operations.
Optionally, the processor further implements the following steps when executing the program:
when acquiring the downlink frequency offset estimation value of each terminal in the scheduled terminal, measuring the uplink reference signal sent by each terminal, and acquiring the uplink frequency offset estimation value of the terminal as the downlink frequency offset estimation value of the terminal.
Optionally, the processor further implements the following steps when executing the program:
and when the downlink frequency offset precompensation value of each terminal is generated, calculating to obtain the downlink frequency offset precompensation value of the terminal according to the downlink frequency offset estimation value of the terminal and a preset first adjustment coefficient.
Optionally, the processor further implements the following steps when executing the program:
when the unified frequency offset compensation value of the scheduled terminal is calculated according to the downlink frequency offset precompensation value of each terminal, calculating the average value of the downlink frequency offset precompensation values of the scheduled terminal, and calculating to obtain the unified frequency offset compensation value according to the calculated average value and a preset second adjustment coefficient.
Optionally, the processor further implements the following steps when executing the program:
when the frequency offset precompensation is carried out on the downlink data of each terminal in the first class of terminals in the frequency domain according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, aiming at each terminal in the first class of terminals, a convolution coefficient corresponding to the terminal is generated according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value; and carrying out convolution calculation on the downlink frequency domain data of the terminal by utilizing the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
Optionally, the processor further implements the following steps when executing the program:
when the downlink data of the scheduled terminal is subjected to frequency offset pre-compensation in the time domain according to the unified frequency offset compensation value, generating a time domain compensation quantity corresponding to each time domain sampling point according to the unified frequency offset compensation value;
and performing complex dot product operation on the downlink time domain data of the scheduled terminal by using the time domain compensation quantity to obtain the downlink time domain data after the frequency offset compensation of the scheduled terminal.
It should be noted that the network side device in this embodiment is a network side device corresponding to the method shown in fig. 2, and the implementation manners in the above embodiments are all applied to the embodiment of the network side device, and the same technical effects can be achieved. In the network-side device, the transceiver 402 and the memory 403, and the transceiver 402 and the processor 401 may be communicatively connected through a bus interface, the function of the processor 401 may also be implemented by the transceiver 402, and the function of the transceiver 402 may also be implemented by the processor 401. It should be noted that, the network side device provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are not repeated herein.
In some embodiments of the present application, there is also provided a computer readable storage medium having a program stored thereon, which when executed by a processor, performs the steps of:
acquiring a downlink frequency offset estimation value of each terminal in a scheduled terminal, and generating a downlink frequency offset precompensation value of each terminal;
calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal;
according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, respectively carrying out frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval;
and according to the unified frequency offset compensation value, performing frequency offset pre-compensation on the downlink data of the scheduled terminal in a time domain.
When executed by the processor, the program can implement all implementation manners of the frequency offset precompensation method applied to the network side device, and can achieve the same technical effect, and is not repeated here to avoid repetition.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiments of the present application.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (18)
1. A method for frequency offset precompensation is applied to network side equipment, and is characterized by comprising the following steps:
acquiring a downlink frequency offset estimation value of each terminal in a scheduled terminal, and generating a downlink frequency offset precompensation value of each terminal;
calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal;
according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, respectively carrying out frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval;
and according to the unified frequency offset compensation value, performing frequency offset pre-compensation on the downlink data of the scheduled terminal in a time domain.
2. The method of claim 1, wherein the step of obtaining the downlink frequency offset estimate for each of the scheduled terminals comprises:
and measuring an uplink reference signal sent by each terminal to obtain an uplink frequency offset estimation value of the terminal, wherein the uplink frequency offset estimation value is used as a downlink frequency offset estimation value of the terminal.
3. The method of claim 1, wherein the step of generating the pre-compensation value of the downlink frequency offset for each terminal comprises:
and calculating to obtain a downlink frequency offset precompensation value of the terminal according to the downlink frequency offset estimation value of the terminal and a preset first adjustment coefficient.
4. The method of claim 1, wherein the step of calculating the unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset pre-compensation value of each terminal comprises:
and calculating the average value of the downlink frequency offset precompensation values of the scheduled terminal, and calculating to obtain the uniform frequency offset compensation value according to the calculated average value and a preset second adjustment coefficient.
5. The method according to any of claims 1 to 4, wherein the step of performing frequency offset precompensation on the downlink data of each terminal in the first class of terminals in the frequency domain according to the difference between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value comprises:
aiming at each terminal in the first class of terminals, respectively generating a convolution coefficient corresponding to the terminal according to a difference value between a downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value;
and carrying out convolution calculation on the downlink frequency domain data of the terminal by utilizing the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
6. The method of claim 5, wherein the step of performing frequency offset pre-compensation on the downlink data of the scheduled terminal in the time domain according to the unified frequency offset compensation value comprises:
generating a time domain compensation quantity corresponding to each time domain sampling point according to the unified frequency offset compensation value;
and performing complex dot product operation on the downlink time domain data of the scheduled terminal by using the time domain compensation quantity to obtain the downlink time domain data after the frequency offset compensation of the scheduled terminal.
7. A network-side device, comprising: a memory, a processor, a transceiver, and a program stored on the memory and executable on the processor; it is characterized in that the preparation method is characterized in that,
the processor implements the following steps when executing the program:
acquiring a downlink frequency offset estimation value of each terminal in a scheduled terminal, and generating a downlink frequency offset precompensation value of each terminal;
calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset precompensation value of each terminal;
according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, respectively carrying out frequency offset precompensation on the downlink data of each terminal in a first class of terminals in the frequency domain, wherein the first class of terminals are terminals of which the difference value in the scheduled terminals exceeds a preset interval;
and according to the unified frequency offset compensation value, performing frequency offset pre-compensation on the downlink data of the scheduled terminal in a time domain.
8. The network-side device of claim 7, wherein the processor when executing the program further performs the steps of:
when acquiring the downlink frequency offset estimation value of each terminal in the scheduled terminal, measuring the uplink reference signal sent by each terminal, and acquiring the uplink frequency offset estimation value of the terminal as the downlink frequency offset estimation value of the terminal.
9. The network-side device of claim 7, wherein the processor when executing the program further performs the steps of:
and when the downlink frequency offset precompensation value of each terminal is generated, calculating to obtain the downlink frequency offset precompensation value of the terminal according to the downlink frequency offset estimation value of the terminal and a preset first adjustment coefficient.
10. The network-side device of claim 7, wherein the processor when executing the program further performs the steps of:
when the unified frequency offset compensation value of the scheduled terminal is calculated according to the downlink frequency offset precompensation value of each terminal, calculating the average value of the downlink frequency offset precompensation values of the scheduled terminal, and calculating to obtain the unified frequency offset compensation value according to the calculated average value and a preset second adjustment coefficient.
11. The network-side device of any one of claims 7 to 10, wherein the processor, when executing the program, further performs the steps of:
when the frequency offset precompensation is carried out on the downlink data of each terminal in the first class of terminals in the frequency domain according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value, aiming at each terminal in the first class of terminals, a convolution coefficient corresponding to the terminal is generated according to the difference value between the downlink frequency offset precompensation value of the terminal and the unified frequency offset compensation value; and carrying out convolution calculation on the downlink frequency domain data of the terminal by utilizing the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
12. The network-side device of claim 11, wherein the processor when executing the program further performs the steps of:
when the downlink data of the scheduled terminal is subjected to frequency offset pre-compensation in the time domain according to the unified frequency offset compensation value, generating a time domain compensation quantity corresponding to each time domain sampling point according to the unified frequency offset compensation value;
and performing complex dot product operation on the downlink time domain data of the scheduled terminal by using the time domain compensation quantity to obtain the downlink time domain data after the frequency offset compensation of the scheduled terminal.
13. A frequency deviation precompensation device is applied to network side equipment and is characterized by comprising the following components:
the frequency offset estimation unit is used for acquiring a downlink frequency offset estimation value of each terminal in the scheduled terminal and generating a downlink frequency offset precompensation value of each terminal;
the unified frequency offset compensation calculating unit is used for calculating a unified frequency offset compensation value of the scheduled terminal according to the downlink frequency offset pre-compensation value of each terminal;
a first pre-compensation unit, configured to perform frequency offset pre-compensation on downlink data of each terminal in a first class of terminals in a frequency domain according to a difference between a downlink frequency offset pre-compensation value of the terminal and the uniform frequency offset compensation value, where the first class of terminals are terminals whose difference in the scheduled terminals exceeds a preset interval;
and the second pre-compensation unit is used for performing frequency offset pre-compensation on the downlink data of the scheduled terminal in the time domain according to the unified frequency offset compensation value.
14. The frequency offset precompensation apparatus of claim 13,
and the frequency offset estimation unit is further used for calculating to obtain a downlink frequency offset precompensation value of the terminal according to the downlink frequency offset estimation value of the terminal and a preset first adjustment coefficient.
15. The frequency offset precompensation apparatus of claim 13,
the unified frequency offset compensation calculating unit is further configured to calculate an average value of downlink frequency offset pre-compensation values of the scheduled terminal, and calculate to obtain the unified frequency offset compensation value according to the calculated average value and a preset second adjustment coefficient.
16. The frequency offset precompensation apparatus of claim 13 or 15,
the first pre-compensation unit is further configured to generate, for each terminal in the first class of terminals, a convolution coefficient corresponding to the terminal according to a difference between a downlink frequency offset pre-compensation value of the terminal and the uniform frequency offset compensation value; and carrying out convolution calculation on the downlink frequency domain data of the terminal by utilizing the convolution coefficient to obtain the downlink frequency domain data after the frequency offset compensation of the terminal.
17. The frequency offset precompensation apparatus of claim 16,
the second pre-compensation unit is further configured to generate a time domain compensation amount corresponding to each time domain sampling point according to the unified frequency offset compensation value; and performing complex dot product operation on the downlink time domain data of the scheduled terminal by using the time domain compensation quantity to obtain the downlink time domain data after the frequency offset compensation of the scheduled terminal.
18. A computer storage medium comprising instructions which, when executed on a computer, cause the computer to perform the method of any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010506932.9A CN113765840B (en) | 2020-06-05 | 2020-06-05 | Method and device for frequency offset precompensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010506932.9A CN113765840B (en) | 2020-06-05 | 2020-06-05 | Method and device for frequency offset precompensation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113765840A true CN113765840A (en) | 2021-12-07 |
| CN113765840B CN113765840B (en) | 2023-02-17 |
Family
ID=78785146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010506932.9A Active CN113765840B (en) | 2020-06-05 | 2020-06-05 | Method and device for frequency offset precompensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113765840B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024098205A1 (en) * | 2022-11-07 | 2024-05-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency offset compensation in a network equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377716A (en) * | 2010-08-12 | 2012-03-14 | 中兴通讯股份有限公司 | Pre-compensation method and device for descending frequency offset of orthogonal frequency division multiple access (OFDMA) communication system |
| CN106685869A (en) * | 2017-01-19 | 2017-05-17 | 京信通信***（广州）有限公司 | Frequency offset compensation method and related device |
| CN107370698A (en) * | 2016-05-13 | 2017-11-21 | 中兴通讯股份有限公司 | A kind of downlink signal processing method, device and base station |
| US20180054269A1 (en) * | 2016-08-22 | 2018-02-22 | Phasorlab, Inc. | Time-Domain and Frequency-Domain Approach to Frequency Offset Correction Method for LTE SC-FDMA Uplink |
| CN107819716A (en) * | 2017-10-31 | 2018-03-20 | 锐捷网络股份有限公司 | A kind of frequency bias compensation method and equipment based on frequency domain |
| CN109729032A (en) * | 2017-10-31 | 2019-05-07 | 深圳市中兴微电子技术有限公司 | A kind of bearing calibration, device and the computer readable storage medium of offset estimation value |
-
2020
- 2020-06-05 CN CN202010506932.9A patent/CN113765840B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377716A (en) * | 2010-08-12 | 2012-03-14 | 中兴通讯股份有限公司 | Pre-compensation method and device for descending frequency offset of orthogonal frequency division multiple access (OFDMA) communication system |
| CN107370698A (en) * | 2016-05-13 | 2017-11-21 | 中兴通讯股份有限公司 | A kind of downlink signal processing method, device and base station |
| US20180054269A1 (en) * | 2016-08-22 | 2018-02-22 | Phasorlab, Inc. | Time-Domain and Frequency-Domain Approach to Frequency Offset Correction Method for LTE SC-FDMA Uplink |
| CN106685869A (en) * | 2017-01-19 | 2017-05-17 | 京信通信***（广州）有限公司 | Frequency offset compensation method and related device |
| CN107819716A (en) * | 2017-10-31 | 2018-03-20 | 锐捷网络股份有限公司 | A kind of frequency bias compensation method and equipment based on frequency domain |
| CN109729032A (en) * | 2017-10-31 | 2019-05-07 | 深圳市中兴微电子技术有限公司 | A kind of bearing calibration, device and the computer readable storage medium of offset estimation value |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024098205A1 (en) * | 2022-11-07 | 2024-05-16 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency offset compensation in a network equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113765840B (en) | 2023-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112449419B (en) | Frequency hopping method, device and equipment | |
| CN110536420B (en) | Method and equipment for configuring time domain detection position of physical downlink control channel | |
| CN112533230B (en) | Measurement configuration method, terminal and base station | |
| CN114006682B (en) | Beam indication method, device, terminal and network side equipment | |
| CN110958094A (en) | Configuration method, detection method and equipment of physical downlink control channel | |
| JP2013102337A (en) | Radio communications system, interference measurement method, radio base station device, and user terminal | |
| CN113890702A (en) | Beam indication method, device, terminal and network side equipment | |
| CN110876194A (en) | Indication method and device of space related information | |
| CN110933745B (en) | Method and equipment for large-scale antenna transmission | |
| CN113923701A (en) | Method and device for measurement configuration | |
| CN113765840B (en) | Method and device for frequency offset precompensation | |
| US20210328609A1 (en) | Digital pre-distorter training | |
| US20160211953A1 (en) | Communication apparatus, communication method and communication system | |
| CN112804692B (en) | Signal processing method and device | |
| CN113767603B (en) | Communication method and communication device | |
| US11647536B2 (en) | Methods, device and computer-readable medium for determining timing advance | |
| CN112398618B (en) | Sending method, receiving method, terminal and network equipment of sounding reference signal | |
| CN114257353B (en) | Channel transmission method, receiving method, terminal and base station | |
| CN111865528B (en) | Method and equipment for triggering reporting of channel state information | |
| CN112929317A (en) | Phase noise estimation method and device, communication device and communication equipment | |
| CN114339997A (en) | Resource allocation method, terminal and base station | |
| US9819385B2 (en) | Method and apparatus for interference cancellation | |
| US9226183B2 (en) | Reference signal measurement | |
| CN115208723B (en) | Frequency offset estimation method and device based on clustering algorithm | |
| CN113709873B (en) | Configuration method and equipment for physical uplink control channel resources |
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 |