CN112804170A - DC offset processing method and receiver - Google Patents
DC offset processing method and receiver Download PDFInfo
- Publication number
- CN112804170A CN112804170A CN201911115142.1A CN201911115142A CN112804170A CN 112804170 A CN112804170 A CN 112804170A CN 201911115142 A CN201911115142 A CN 201911115142A CN 112804170 A CN112804170 A CN 112804170A
- Authority
- CN
- China
- Prior art keywords
- direct current
- offset
- carrier
- sub
- offset detection
- 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
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
- H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0264—Arrangements for coupling to transmission lines
- H04L25/0292—Arrangements specific to the receiver end
- H04L25/0296—Arrangements to ensure DC-balance
Abstract
The embodiment of the invention provides a direct current offset processing method and a receiver, wherein the direct current offset processing method comprises the following steps: performing time domain and frequency domain transformation on the input data of the time domain to obtain output data of the frequency domain; performing direct current offset detection on the output data to obtain a direct current offset detection result; and if the direct current offset detection result is determined to be the existence of the direct current offset, performing direct current offset elimination. Therefore, the invention realizes the detection and elimination of the direct current offset in the frequency domain, improves the accuracy of the detection and elimination of the direct current offset and also improves the system performance.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a dc offset processing method and a receiver.
Background
In a communication system, a certain DCO (Direct Current offset) is often generated due to leakage of a local oscillator at a receiving end, as shown in fig. 1, when the dc offset reaches a certain degree, the receiving performance of the system will be greatly affected.
At present, for dc offset detection and cancellation, detection and cancellation are usually performed in a time domain, and the specific process includes: the dc offset is estimated by averaging the time domain data (e.g., X (0), X (1)), …, X (N-1)), and the estimation result is brought into the input data for cancellation, so that the output data is considered to have cancelled the dc offset.
However, in the detection and cancellation in the time domain, the sequence length for dc offset estimation is limited, and the average of the useful signal in this time period is not always 0, and therefore the estimation result is not necessarily equivalent to the dc offset.
Disclosure of Invention
Embodiments of the present invention provide a dc offset processing method and a receiver, so as to improve accuracy of dc offset detection and cancellation, thereby avoiding affecting system performance.
An embodiment of the present invention provides a dc offset processing method, including:
performing time domain and frequency domain transformation on the input data of the time domain to obtain output data of the frequency domain;
performing direct current offset detection on the output data to obtain a direct current offset detection result;
and if the direct current offset detection result is determined to be the existence of the direct current offset, performing direct current offset elimination.
An embodiment of the present invention provides a dc offset processing apparatus, including:
the time domain and frequency domain transformation module is used for carrying out time domain and frequency domain transformation on input data of a time domain to obtain output data of a frequency domain;
the direct current offset detection module is used for carrying out direct current offset detection on the output data to obtain a direct current offset detection result;
and the direct current offset elimination module is used for eliminating the direct current offset if the direct current offset detection result is determined to be the existence of the direct current offset.
The embodiment of the invention provides a receiver, which comprises a memory, a processor and a program which is stored on the memory and can be run on the processor, and is characterized in that the processor executes the program and realizes the following steps:
performing time domain and frequency domain transformation on the input data of the time domain to obtain output data of the frequency domain;
performing direct current offset detection on the output data to obtain a direct current offset detection result;
and if the direct current offset detection result is determined to be the existence of the direct current offset, performing direct current offset elimination.
Embodiments of the present invention provide a non-transitory computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the dc offset processing method described above.
According to the direct current offset processing method and the receiver provided by the embodiment of the invention, the time domain and frequency domain transformation is carried out on the input data of the time domain to obtain the output data of the frequency domain, the direct current offset detection is carried out on the output data of the frequency domain to obtain the direct current offset detection result, and if the direct current offset detection result is determined to be the direct current offset, the direct current offset is eliminated, so that the direct current offset detection and elimination are carried out on the frequency domain, the accuracy of the direct current offset detection and elimination is improved, and the system performance is also improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of DC offset;
FIG. 2 is a flow chart of a DC offset processing method according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an application scenario of the DC offset processing method according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating another application scenario of the DC offset processing method according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of a time-domain received signal;
FIG. 6 is another schematic diagram of a time-domain received signal;
FIG. 7 is a block diagram of a DC offset processing apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a receiver in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the detection and cancellation in the time domain, the sequence length for dc offset estimation is limited, and the average of the useful signal in this time period is not always 0, so the estimation result is not always equivalent to the dc offset, and the signal quality is affected by performing dc offset cancellation using the estimation result. In addition, for a 5G NR (New Radio, New air interface) system, the dc subcarrier itself may carry a useful signal, which may cause the time domain averaging result to deviate from the actual dc offset value seriously.
In view of the foregoing problems, embodiments of the present invention provide a dc offset processing method to improve accuracy of dc offset detection and elimination, so as to avoid affecting system performance. The following description will be made by way of specific examples.
Fig. 2 is a flowchart of a dc offset processing method in an embodiment of the present invention, and fig. 3 is an application scenario diagram of the dc offset processing method in the embodiment of the present invention, where the method may be used in a base station or a terminal, as shown in fig. 2, the method may include the following steps:
step 210: and performing time domain and frequency domain transformation on the time domain input data to obtain frequency domain output data.
Specifically, when performing time-domain frequency-domain Transform on input data in the time domain, FFT (Fast Fourier Transform) may be employed.
Step 220: and performing direct current offset detection on the output data of the frequency domain to obtain a direct current offset detection result.
Specifically, the dc offset detection is performed on the frequency domain data, and the obtained dc offset detection result may be that the dc offset exists or the dc offset does not exist. When a dc offset is detected, it can be cancelled to improve system performance; when the DC offset is not detected, the DC offset is not eliminated, thereby reducing the influence on the received signal.
Step 230: and if the direct current offset detection result is determined to be the existence of the direct current offset, performing direct current offset elimination.
In an exemplary scenario, as shown in fig. 3, the input data X is input data in a time domain, the output data Y is output data in a frequency domain, the FFT is used to transform the input data X in the time domain into the output data Y in the frequency domain, the DCOD (DC Offset Detection) is used to perform DC Offset Detection on the output data Y in the frequency domain to obtain a DC Offset Detection result, and the DCOC (DC Offset Cancellation) is used to perform DC Offset Cancellation when it is determined that the DC Offset Detection result is DC Offset; otherwise, the state is in a bypass state.
It can be seen from the above embodiments that, by performing time domain and frequency domain transformation on time domain input data to obtain frequency domain output data, performing dc offset detection on the frequency domain output data to obtain a dc offset detection result, and if it is determined that a dc offset exists in the dc offset detection result, performing dc offset cancellation, thereby implementing dc offset detection and cancellation in the frequency domain, improving accuracy of dc offset detection and cancellation, and also improving system performance.
Further, based on the above method, when step 220 is executed, the following implementation manners may be adopted, but not limited to:
(1-1) determining a direct current subcarrier from the output data;
(1-2) if the direct current subcarrier meets a first condition, determining that the direct current offset detection result is that direct current offset exists;
(1-3) if the dc subcarrier does not satisfy the first condition, determining that the dc offset detection result is that no dc offset exists;
wherein the first condition comprises:
the direct current subcarrier is a first subcarrier, and the first subcarrier is used for representing a maximum power subcarrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than that of a second sub-carrier, the power difference between the direct current sub-carrier and the second sub-carrier is greater than a first set difference value, and the second sub-carrier is used for representing the maximum power sub-carrier except the first sub-carrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than a third power, and the power difference between the direct current sub-carrier and the third power is greater than a second set difference value, wherein the third power is used for representing the average power of each sub-carrier except the first sub-carrier in the output data.
As can be seen from the above embodiments, when performing dc offset detection in the frequency domain, it is possible to detect a dc subcarrier in output data, and if a first condition is satisfied, it is determined that a dc offset exists, and corresponding dc offset cancellation is performed; if the first condition is not met, determining that no direct current offset exists, and not performing corresponding direct current offset elimination, thereby improving the reliability and efficiency of direct current offset processing.
Further, based on the above method, when step 220 is executed, the following implementation manners may be adopted, but not limited to:
and (2-1) acquiring data to be detected for direct current offset detection from the output data, wherein the data to be detected comprises N frequency domain data with specified lengths.
Specifically, of the frequency domain data with N specified lengths, N may be a value configured by the system according to practical situations, such as: 1. 2, 3 and 4. In addition, the specified length may be an FFT processing length (len _ FFT).
(2-2) determining a corresponding direct current subcarrier from each of the frequency domain data of the designated length;
specifically, if the specified length is len _ fft, the corresponding dc subcarrier is determined from the len _ fft frequency domain data.
(2-3) if each corresponding direct current subcarrier meets a second condition, determining that the direct current offset detection result is that the direct current offset exists.
Specifically, it may be determined that the dc offset exists only when the dc subcarriers in the frequency domain data of N specified lengths all satisfy the second condition.
(2-4) if at least one of the corresponding dc subcarriers does not satisfy the second condition, determining that the dc offset detection result is that no dc offset exists;
wherein the second condition comprises:
the corresponding direct current sub-carrier is a fourth sub-carrier, and the fourth sub-carrier is used for representing the maximum power sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
the power of the corresponding direct current sub-carrier is greater than that of a fifth sub-carrier, and the power difference between the direct current sub-carrier and the fifth sub-carrier is greater than a third set difference value, wherein the fifth sub-carrier is used for representing the maximum power sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
and the power of the corresponding direct current sub-carrier is greater than sixth power, and the power difference between the corresponding direct current sub-carrier and the corresponding direct current sub-carrier is greater than a fourth set difference value, wherein the sixth power represents the average power of each sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length.
As can be seen from the above embodiments, when performing dc offset detection in the frequency domain, the dc subcarriers in the N pieces of frequency domain data with specified lengths may be detected, and only when the dc subcarriers in the N pieces of frequency domain data with specified lengths all satisfy the second condition, it may be determined that dc offset exists, and corresponding dc offset cancellation is performed; otherwise, determining that no DC offset exists, and not performing corresponding DC offset elimination to avoid signal distortion caused by error elimination, thereby further improving the accuracy of DC offset processing and avoiding system resource waste.
Further, based on the above method, the N frequency domain data of the specified length in (2-1) may be continuous data.
Specifically, if the specified length is len _ FFT, N consecutive times of FFT processed data can be acquired.
Further, based on the above method, the following implementation manners may be adopted in (2-1) but are not limited to:
(3-1) determining an interval time for acquiring the frequency domain data of each of the designated lengths;
and (3-2) acquiring N pieces of frequency domain data with the specified length from the output data according to the interval time.
Specifically, the interval time may be a time value configured by the system according to actual conditions. Also, the interval time may be a time value T1, such as: the N frequency domain data with specified length are obtained at equal intervals according to T1; there may also be a plurality of time values T2, T3, …, such as: the N pieces of frequency domain data of a predetermined length are acquired at different intervals such as T2, T3, …, and the like.
It can be seen from the above embodiments that, when performing dc offset detection in the frequency domain, N pieces of frequency domain data of specified lengths may be continuously obtained from output data, or N pieces of frequency domain data of specified lengths may be obtained according to a preset interval time, so that data obtaining methods for dc offset detection are enriched, and individual requirements for dc offset detection are met.
Further, based on the above method, when step 230 is executed, the following implementation manners may be adopted, but not limited to:
(4-1) determining an activation period for activating the DC offset detection function.
Specifically, the activation period for activating the dc offset detection function may be a period value configured by the system according to actual conditions.
(4-2) periodically activating the dc offset detection function according to the activation period, and performing periodic dc offset detection on the output data.
Further, based on the above method, when step 230 is executed, the following implementation manners may be adopted, but not limited to:
(5-1) when an activation event for activating the dc offset detection function is detected, activating the dc offset detection function according to the activation event, and performing dc offset detection on the output data.
It can be seen from the above embodiments that, when performing dc offset detection in the frequency domain, periodic dc offset detection may be performed, and also dc offset detection may be performed when a specific event is detected, so that dc offset detection under different requirements is satisfied, and the practicality of dc offset detection is improved.
Further, based on the above method, after the step 220 is executed, the method may further include:
(6-1) if the direct current offset detection result indicates that the direct current offset exists, triggering a first enabling signal, wherein the first enabling signal is used for indicating that the direct current offset detection result indicates that the direct current offset exists.
Further, based on the above method, when performing step 230, the method may include:
(7-1) determining that the dc offset detection result is the presence of a dc offset according to the first enable signal;
and (7-2) activating a direct current offset elimination function, and carrying out direct current offset elimination on the input data of the subsequent time domain.
Specifically, as shown in fig. 2, the DCOD detects that the dc offset detection result is that the dc offset exists, and sends a first enable signal to the DCOC, so that after receiving the first enable signal, the DCOC determines that the dc offset detection result is that the dc offset exists according to the first enable signal, activates the dc offset cancellation function, and performs dc offset cancellation on the input data in the subsequent time domain.
As can be seen from the above embodiments, when the dc offset detection result indicates that a dc offset exists, the dc offset cancellation function may be activated by the first enable signal, and dc offset cancellation may be performed on input data in a subsequent time domain, so that efficiency of dc offset cancellation is improved.
Further, based on the above method, after the step 220 is executed, the method may further include:
(8-1) if the dc offset detection result indicates that no dc offset exists, triggering a second enable signal, where the second enable signal is used to indicate that no dc offset exists in the dc offset detection result.
Further, based on the above method, the method may further include:
(9-1) determining that the dc offset detection result is that no dc offset exists according to the second enable signal;
and (9-2) not activating the direct current offset elimination function and not carrying out direct current offset elimination on the input data of the subsequent time domain.
As can be seen from the above embodiments, when the dc offset detection result indicates that no dc offset exists, the dc offset cancellation function may not be activated by the second enable signal, and dc offset cancellation is not performed on input data in a subsequent time domain, so that signal distortion caused by erroneous cancellation is avoided, and influence on system performance is also avoided.
Further, based on the above method, when step 230 is executed, the following implementation manners may be adopted, but not limited to:
(10-1) determining a cancellation scheme for performing dc offset cancellation;
and (10-2) performing direct current offset cancellation on input data of a subsequently input time domain according to a cancellation mode.
Further, based on the above method, the elimination method includes: performing dc offset cancellation by using a dc signal trap, wherein a transfer function h (z) of the dc signal trap is shown in formula (1):
H(z)＝(1-z-1)/(1-a×z-1) … … … … … … … … … … … … … formula (1)
Where a is the coefficient and z is the delay. And a is a coefficient smaller than 1 and close to 1, and the value of a can be matched to meet different notch bandwidth requirements.
It can be seen from the above embodiments that, when dc offset is eliminated, dc offset can be eliminated by using the dc signal trap, and simulation analysis is performed on different modulation modes, and a simulation result shows that, in the presence of dc offset, the dc trap can effectively eliminate dc offset, thereby improving system performance. The different Modulation schemes include QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and the like.
Fig. 4 is a diagram of another application scenario of the dc offset processing method according to the embodiment of the present invention. As shown in fig. 4, FS1 and FS2 are sample rates, DCOC is processed in the time domain, and DCOD is processed in the frequency domain. Wherein FS1 is larger than FS 2.
If no DCO is present in the time domain received signal, the signal may be as shown in fig. 5: if the signal intensity of the DC subcarrier position does not meet the detection requirement of the DCOD: the DC (Direct Current) subcarrier is a maximum power subcarrier, is Δ Pavg greater than the average power and Δ P1 greater than the secondary subcarrier, and EN (enable signal) is 0 at this time, i.e., the DCOC module bypasses, where Δ Pavg and Δ P1 may be two setting differences configured in advance.
If DCO is present in the time domain received signal, the signal may be as shown in fig. 6: at this time, the DC subcarrier position signal strength generally easily meets the detection requirement of the DCOD: the DC subcarrier is the maximum power subcarrier and is Δ Pavg greater than the average power and Δ P1 greater than the next largest subcarrier. At this time, EN (enable signal) is 1, i.e., DCOC module is enabled.
In addition, the detection period of the DCOD is longer, and is generally triggered by the state change of an analog device or other specific events, if the existing DCO is not detected by the current DCOD module, the DCOD is not activated again within a longer time, and the DCOC module bypasses the DCOD until the module is enabled next time; if the current DCOD module detects the presence of a DCO, the DCOC module is enabled until the next time the module is bypassed.
As can be seen from the above embodiments, the dc offset processing includes not only the dc offset detection strategy, but also the cancellation measurement, that is, the dc offset is detected first to determine whether the dc offset exists. If the DC offset exists, the DC offset is eliminated by adopting a wave trap and the like, otherwise, the DC offset elimination module is bypassed. Particularly, the coefficient of the direct current offset wave trap is adjustable, the realization is simple, and the direct current offsets of different sizes can be effectively eliminated, so that the receiving performance of the system is effectively improved.
Fig. 7 is a block diagram of a dc offset processing apparatus according to an embodiment of the present invention, where the dc offset processing apparatus may be used in a base station or a terminal, and as shown in fig. 7, the apparatus may include:
a time domain and frequency domain transformation module 71, configured to perform time domain and frequency domain transformation on the time domain input data to obtain frequency domain output data;
a dc offset detection module 72, configured to perform dc offset detection on the output data to obtain a dc offset detection result;
and a dc offset cancellation module 73, configured to perform dc offset cancellation if it is determined that the dc offset detection result indicates that a dc offset exists.
Optionally, the performing dc offset detection on the output data to obtain a dc offset detection result includes:
determining a direct current subcarrier from the output data;
if the direct current subcarrier meets a first condition, determining that the direct current offset detection result is that direct current offset exists;
if the direct current subcarrier does not meet the first condition, determining that the direct current offset detection result is that no direct current offset exists;
wherein the first condition comprises:
the direct current subcarrier is a first subcarrier, and the first subcarrier is used for representing a maximum power subcarrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than that of a second sub-carrier, the power difference between the direct current sub-carrier and the second sub-carrier is greater than a first set difference value, and the second sub-carrier is used for representing the maximum power sub-carrier except the first sub-carrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than a third power, and the power difference between the direct current sub-carrier and the third power is greater than a second set difference value, wherein the third power is used for representing the average power of each sub-carrier except the first sub-carrier in the output data.
Optionally, the performing dc offset detection on the output data to obtain a dc offset detection result includes:
acquiring data to be detected for DC offset detection from the output data, wherein the data to be detected comprises N frequency domain data with specified length;
determining corresponding direct current subcarriers from each frequency domain data with the specified length;
if each corresponding direct current subcarrier meets a second condition, determining that the direct current offset detection result is that direct current offset exists;
if at least one of the corresponding direct current subcarriers does not meet the second condition, determining that the direct current offset detection result is that no direct current offset exists;
wherein the second condition comprises:
the corresponding direct current sub-carrier is a fourth sub-carrier, and the fourth sub-carrier is used for representing the maximum power sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
the power of the corresponding direct current sub-carrier is greater than that of a fifth sub-carrier, and the power difference between the direct current sub-carrier and the fifth sub-carrier is greater than a third set difference value, wherein the fifth sub-carrier is used for representing the maximum power sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
and the power of the corresponding direct current sub-carrier is greater than sixth power, and the power difference between the corresponding direct current sub-carrier and the corresponding direct current sub-carrier is greater than a fourth set difference value, wherein the sixth power represents the average power of each sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length.
Optionally, the N pieces of frequency domain data of the specified length are continuous data.
Optionally, the acquiring data to be detected for dc offset detection from the output data, where the data to be detected includes N frequency domain data with specified length, includes:
determining an interval time for acquiring frequency domain data of each specified length;
and acquiring N pieces of frequency domain data with the specified length from the output data according to the interval time.
Optionally, the performing dc offset detection on the output data includes:
determining an activation period for activating the dc offset detection function;
and periodically activating the direct current offset detection function according to the activation period, and performing periodic direct current offset detection on the output data.
Optionally, the performing dc offset detection on the output data includes:
and when an activation event for activating the direct current offset detection function is detected, activating the direct current offset detection function according to the activation event, and performing direct current offset detection on the output data.
Optionally, after performing dc offset detection on the output data to obtain a dc offset detection result, the method further includes:
and if the direct current offset detection result indicates that the direct current offset exists, triggering a first enabling signal, wherein the first enabling signal is used for indicating that the direct current offset detection result indicates that the direct current offset exists.
Optionally, if it is determined that the dc offset detection result indicates that a dc offset exists, performing dc offset cancellation includes:
determining that the direct current offset detection result is that direct current offset exists according to the first enabling signal;
and activating a direct current offset elimination function, and carrying out direct current offset elimination on subsequent time domain input data.
Optionally, after performing dc offset detection on the output data to obtain a dc offset detection result, the method further includes:
and if the direct current offset detection result indicates that no direct current offset exists, triggering a second enabling signal, wherein the second enabling signal is used for indicating that the direct current offset detection result indicates that no direct current offset exists.
Optionally, the method further comprises:
determining that the DC offset detection result is that no DC offset exists according to the second enabling signal;
and not activating the direct current offset elimination function, and not carrying out direct current offset elimination on the input data of the subsequent time domain.
Optionally, the performing dc offset cancellation includes:
determining a cancellation mode for performing DC offset cancellation;
and performing direct current offset elimination on subsequently input time domain input data according to an elimination mode.
Optionally, the eliminating means includes: performing DC offset cancellation by using a DC signal trap, wherein a transfer function H (z) of the DC signal trap is as follows:
H(z)＝(1-z-1)/(1-a×z-1)
where a is the coefficient and z is the delay.
It should be noted that the apparatus provided in this embodiment can implement all the method steps that can be implemented by the above method embodiment, and can achieve the same beneficial effects, and the same contents and beneficial effects in this apparatus embodiment as those in the above method embodiment are not described again.
In addition, as shown in fig. 8, which is a schematic diagram of an entity structure of a receiver provided in the embodiment of the present invention, the receiver may be used in a base station or a terminal, and may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the transceiver 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may invoke a computer program stored on the memory 830 and executable on the processor 810 to perform the steps of:
performing time domain and frequency domain transformation on the input data of the time domain to obtain output data of the frequency domain;
performing direct current offset detection on the output data to obtain a direct current offset detection result;
and if the direct current offset detection result is determined to be the existence of the direct current offset, performing direct current offset elimination.
Optionally, the performing dc offset detection on the output data to obtain a dc offset detection result includes:
determining a direct current subcarrier from the output data;
if the direct current subcarrier meets a first condition, determining that the direct current offset detection result is that direct current offset exists;
if the direct current subcarrier does not meet the first condition, determining that the direct current offset detection result is that no direct current offset exists;
wherein the first condition comprises:
the direct current subcarrier is a first subcarrier, and the first subcarrier is used for representing a maximum power subcarrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than that of a second sub-carrier, the power difference between the direct current sub-carrier and the second sub-carrier is greater than a first set difference value, and the second sub-carrier is used for representing the maximum power sub-carrier except the first sub-carrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than a third power, and the power difference between the direct current sub-carrier and the third power is greater than a second set difference value, wherein the third power is used for representing the average power of each sub-carrier except the first sub-carrier in the output data.
Optionally, the performing dc offset detection on the output data to obtain a dc offset detection result includes:
acquiring data to be detected for DC offset detection from the output data, wherein the data to be detected comprises N frequency domain data with specified length;
determining corresponding direct current subcarriers from each frequency domain data with the specified length;
if each corresponding direct current subcarrier meets a second condition, determining that the direct current offset detection result is that direct current offset exists;
if at least one of the corresponding direct current subcarriers does not meet the second condition, determining that the direct current offset detection result is that no direct current offset exists;
wherein the second condition comprises:
the corresponding direct current sub-carrier is a fourth sub-carrier, and the fourth sub-carrier is used for representing the maximum power sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
the power of the corresponding direct current sub-carrier is greater than that of a fifth sub-carrier, and the power difference between the direct current sub-carrier and the fifth sub-carrier is greater than a third set difference value, wherein the fifth sub-carrier is used for representing the maximum power sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
and the power of the corresponding direct current sub-carrier is greater than sixth power, and the power difference between the corresponding direct current sub-carrier and the corresponding direct current sub-carrier is greater than a fourth set difference value, wherein the sixth power represents the average power of each sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length.
Optionally, the N pieces of frequency domain data of the specified length are continuous data.
Optionally, the acquiring data to be detected for dc offset detection from the output data, where the data to be detected includes N frequency domain data with specified length, includes:
determining an interval time for acquiring frequency domain data of each specified length;
and acquiring N pieces of frequency domain data with the specified length from the output data according to the interval time.
Optionally, the performing dc offset detection on the output data includes:
determining an activation period for activating the dc offset detection function;
and periodically activating the direct current offset detection function according to the activation period, and performing periodic direct current offset detection on the output data.
Optionally, the performing dc offset detection on the output data includes:
and when an activation event for activating the direct current offset detection function is detected, activating the direct current offset detection function according to the activation event, and performing direct current offset detection on the output data.
Optionally, after performing dc offset detection on the output data to obtain a dc offset detection result, the method further includes:
and if the direct current offset detection result indicates that the direct current offset exists, triggering a first enabling signal, wherein the first enabling signal is used for indicating that the direct current offset detection result indicates that the direct current offset exists.
Optionally, if it is determined that the dc offset detection result indicates that a dc offset exists, performing dc offset cancellation includes:
determining that the direct current offset detection result is that direct current offset exists according to the first enabling signal;
and activating a direct current offset elimination function, and carrying out direct current offset elimination on subsequent time domain input data.
Optionally, after performing dc offset detection on the output data to obtain a dc offset detection result, the method further includes:
and if the direct current offset detection result indicates that no direct current offset exists, triggering a second enabling signal, wherein the second enabling signal is used for indicating that the direct current offset detection result indicates that no direct current offset exists.
Optionally, the method further comprises:
determining that the DC offset detection result is that no DC offset exists according to the second enabling signal;
and not activating the direct current offset elimination function, and not carrying out direct current offset elimination on the input data of the subsequent time domain.
Optionally, the performing dc offset cancellation includes:
determining a cancellation mode for performing DC offset cancellation;
and performing direct current offset elimination on subsequently input time domain input data according to an elimination mode.
Optionally, the eliminating means includes: performing DC offset cancellation by using a DC signal trap, wherein a transfer function H (z) of the DC signal trap is as follows:
H(z)＝(1-z-1)/(1-a×z-1)
where a is the coefficient and z is the delay.
It should be noted that the receiver provided in this embodiment can implement all the method steps that can be implemented by the foregoing method embodiment, and can achieve the same beneficial effects, and details of the same contents and beneficial effects in this terminal embodiment as those in the foregoing method embodiment are not repeated herein.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes 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 invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
An embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the following steps:
performing time domain and frequency domain transformation on the input data of the time domain to obtain output data of the frequency domain;
performing direct current offset detection on the output data to obtain a direct current offset detection result;
and if the direct current offset detection result is determined to be the existence of the direct current offset, performing direct current offset elimination.
It should be noted that the non-transitory computer-readable storage medium provided in this embodiment can implement all the method steps that can be implemented by the foregoing method embodiment, and can achieve the same beneficial effects, and the same contents and beneficial effects in the non-transitory computer-readable storage medium embodiment and the foregoing method embodiment are not described again here.
The above-described embodiments of the apparatus are merely illustrative, and 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 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 can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (28)
1. A method for dc offset processing, comprising:
performing time domain and frequency domain transformation on the input data of the time domain to obtain output data of the frequency domain;
performing direct current offset detection on the output data to obtain a direct current offset detection result;
and if the direct current offset detection result is determined to be the existence of the direct current offset, performing direct current offset elimination.
2. The dc offset processing method according to claim 1, wherein the performing dc offset detection on the output data to obtain a dc offset detection result comprises:
determining a direct current subcarrier from the output data;
if the direct current subcarrier meets a first condition, determining that the direct current offset detection result is that direct current offset exists;
if the direct current subcarrier does not meet the first condition, determining that the direct current offset detection result is that no direct current offset exists;
wherein the first condition comprises:
the direct current subcarrier is a first subcarrier, and the first subcarrier is used for representing a maximum power subcarrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than that of a second sub-carrier, the power difference between the direct current sub-carrier and the second sub-carrier is greater than a first set difference value, and the second sub-carrier is used for representing the maximum power sub-carrier except the first sub-carrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than a third power, and the power difference between the direct current sub-carrier and the third power is greater than a second set difference value, wherein the third power is used for representing the average power of each sub-carrier except the first sub-carrier in the output data.
3. The dc offset processing method according to claim 1, wherein the performing dc offset detection on the output data to obtain a dc offset detection result comprises:
acquiring data to be detected for DC offset detection from the output data, wherein the data to be detected comprises N frequency domain data with specified length;
determining corresponding direct current subcarriers from each frequency domain data with the specified length;
if each corresponding direct current subcarrier meets a second condition, determining that the direct current offset detection result is that direct current offset exists;
if at least one of the corresponding direct current subcarriers does not meet the second condition, determining that the direct current offset detection result is that no direct current offset exists;
wherein the second condition comprises:
the corresponding direct current sub-carrier is a fourth sub-carrier, and the fourth sub-carrier is used for representing the maximum power sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
the power of the corresponding direct current sub-carrier is greater than that of a fifth sub-carrier, and the power difference between the direct current sub-carrier and the fifth sub-carrier is greater than a third set difference value, wherein the fifth sub-carrier is used for representing the maximum power sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
and the power of the corresponding direct current sub-carrier is greater than sixth power, and the power difference between the corresponding direct current sub-carrier and the corresponding direct current sub-carrier is greater than a fourth set difference value, wherein the sixth power represents the average power of each sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length.
4. The dc offset processing method according to claim 3, wherein the N pieces of frequency domain data of the specified length are continuous data.
5. The dc offset processing method according to claim 3, wherein the obtaining data to be tested for dc offset detection from the output data, the data to be tested including N frequency domain data with specified length includes:
determining an interval time for acquiring frequency domain data of each specified length;
and acquiring N pieces of frequency domain data with the specified length from the output data according to the interval time.
6. The dc offset processing method according to any of claims 1 to 3, wherein the performing dc offset detection on the output data includes:
determining an activation period for activating the dc offset detection function;
and periodically activating the direct current offset detection function according to the activation period, and performing periodic direct current offset detection on the output data.
7. The dc offset processing method according to any of claims 1 to 3, wherein the performing dc offset detection on the output data includes:
and when an activation event for activating the direct current offset detection function is detected, activating the direct current offset detection function according to the activation event, and performing direct current offset detection on the output data.
8. The dc offset processing method according to any one of claims 1 to 3, further comprising, after performing dc offset detection on the output data to obtain a dc offset detection result:
and if the direct current offset detection result indicates that the direct current offset exists, triggering a first enabling signal, wherein the first enabling signal is used for indicating that the direct current offset detection result indicates that the direct current offset exists.
9. The dc offset processing method according to claim 8, wherein performing dc offset cancellation if it is determined that the dc offset detection result indicates that a dc offset exists, includes:
determining that the direct current offset detection result is that direct current offset exists according to the first enabling signal;
and activating a direct current offset elimination function, and carrying out direct current offset elimination on subsequent time domain input data.
10. The dc offset processing method according to any one of claims 1 to 3, further comprising, after performing dc offset detection on the output data to obtain a dc offset detection result:
and if the direct current offset detection result indicates that no direct current offset exists, triggering a second enabling signal, wherein the second enabling signal is used for indicating that the direct current offset detection result indicates that no direct current offset exists.
11. The dc offset processing method according to claim 10, further comprising:
determining that the DC offset detection result is that no DC offset exists according to the second enabling signal;
and not activating the direct current offset elimination function, and not carrying out direct current offset elimination on the input data of the subsequent time domain.
12. The dc offset processing method according to claim 1, wherein the performing dc offset cancellation comprises:
determining a cancellation mode for performing DC offset cancellation;
and performing direct current offset elimination on subsequently input time domain input data according to an elimination mode.
13. The dc offset processing method according to claim 12, wherein the cancellation scheme comprises: performing DC offset cancellation by using a DC signal trap, wherein a transfer function H (z) of the DC signal trap is as follows:
H(z)＝(1-z-1)/(1-a×z-1)
where a is the coefficient and z is the delay.
14. A dc offset processing apparatus, comprising:
the time domain and frequency domain transformation module is used for carrying out time domain and frequency domain transformation on input data of a time domain to obtain output data of a frequency domain;
the direct current offset detection module is used for carrying out direct current offset detection on the output data to obtain a direct current offset detection result;
and the direct current offset elimination module is used for eliminating the direct current offset if the direct current offset detection result is determined to be the existence of the direct current offset.
15. A receiver comprising a memory, a processor, and a program stored on the memory and executable on the processor, wherein the processor when executing the program performs the steps of:
performing time domain and frequency domain transformation on the input data of the time domain to obtain output data of the frequency domain;
performing direct current offset detection on the output data to obtain a direct current offset detection result;
and if the direct current offset detection result is determined to be the existence of the direct current offset, performing direct current offset elimination.
16. The receiver of claim 15, wherein the performing dc offset detection on the output data to obtain a dc offset detection result comprises:
determining the position signal intensity of the direct current subcarrier from the output data;
if the direct current subcarrier meets a first condition, determining that the direct current offset detection result is that direct current offset exists;
if the direct current subcarrier does not meet the first condition, determining that the direct current offset detection result is that no direct current offset exists;
wherein the first condition comprises:
the direct current subcarrier is a first subcarrier, and the first subcarrier is used for representing a maximum power subcarrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than that of a second sub-carrier, the power difference between the direct current sub-carrier and the second sub-carrier is greater than a first set difference value, and the second sub-carrier is used for representing the maximum power sub-carrier except the first sub-carrier in the output data; and the number of the first and second electrodes,
the power of the direct current sub-carrier is greater than a third power, and the power difference between the direct current sub-carrier and the third power is greater than a second set difference value, wherein the third power is used for representing the average power of each sub-carrier except the first sub-carrier in the output data.
17. The receiver of claim 15, wherein the performing dc offset detection on the output data to obtain a dc offset detection result comprises:
acquiring data to be detected for DC offset detection from the output data, wherein the data to be detected comprises N frequency domain data with specified length;
determining the position signal intensity of the corresponding direct current subcarrier from each frequency domain data with the specified length;
if each corresponding direct current subcarrier meets a second condition, determining that the direct current offset detection result is that direct current offset exists;
if at least one of the corresponding direct current subcarriers does not meet the second condition, determining that the direct current offset detection result is that no direct current offset exists;
wherein the second condition comprises:
the corresponding direct current sub-carrier is a fourth sub-carrier, and the fourth sub-carrier is used for representing the maximum power sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
the power of the corresponding direct current sub-carrier is greater than that of a fifth sub-carrier, and the power difference between the direct current sub-carrier and the fifth sub-carrier is greater than a third set difference value, wherein the fifth sub-carrier is used for representing the maximum power sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length; and the number of the first and second electrodes,
and the power of the corresponding direct current sub-carrier is greater than sixth power, and the power difference between the corresponding direct current sub-carrier and the corresponding direct current sub-carrier is greater than a fourth set difference value, wherein the sixth power represents the average power of each sub-carrier except the fourth sub-carrier in the frequency domain data with the specified length.
18. The receiver of claim 17, wherein the N specified lengths of frequency domain data are contiguous data.
19. The receiver of claim 17, wherein the obtaining data to be tested for dc offset detection from the output data, the data to be tested including N frequency domain data with specified length comprises:
determining an interval time for acquiring frequency domain data of each specified length;
and acquiring N pieces of frequency domain data with the specified length from the output data according to the interval time.
20. The receiver according to any of claims 15 to 17, wherein said performing dc offset detection on said output data comprises:
determining an activation period for activating the dc offset detection function;
and periodically activating the direct current offset detection function according to the activation period, and performing periodic direct current offset detection on the output data.
21. The receiver according to any of claims 15 to 17, wherein said performing dc offset detection on said output data comprises:
and when an activation event for activating the direct current offset detection function is detected, activating the direct current offset detection function according to the activation event, and performing direct current offset detection on the output data.
22. The receiver according to any one of claims 15 to 17, wherein after performing dc offset detection on the output data to obtain a dc offset detection result, the method further comprises:
and if the direct current offset detection result indicates that the direct current offset exists, triggering a first enabling signal, wherein the first enabling signal is used for indicating that the direct current offset detection result indicates that the direct current offset exists.
23. The receiver of claim 22, wherein performing dc offset cancellation if it is determined that the dc offset detection result is that a dc offset exists comprises:
determining that the direct current offset detection result is that direct current offset exists according to the first enabling signal;
and activating a direct current offset elimination function, and carrying out direct current offset elimination on subsequent time domain input data.
24. The receiver according to any one of claims 15 to 17, wherein after performing dc offset detection on the output data to obtain a dc offset detection result, the method further comprises:
and if the direct current offset detection result indicates that no direct current offset exists, triggering a second enabling signal, wherein the second enabling signal is used for indicating that the direct current offset detection result indicates that no direct current offset exists.
25. The receiver of claim 24, further comprising:
determining that the DC offset detection result is that no DC offset exists according to the second enabling signal;
and not activating the direct current offset elimination function, and not carrying out direct current offset elimination on the input data of the subsequent time domain.
26. The receiver of claim 15, wherein the performing dc offset cancellation comprises:
determining a cancellation mode for performing DC offset cancellation;
and performing direct current offset elimination on subsequently input time domain input data according to an elimination mode.
27. The receiver of claim 26, wherein the cancellation scheme comprises: performing DC offset cancellation by using a DC signal trap, wherein a transfer function H (z) of the DC signal trap is as follows:
H(z)＝(1-z-1)/(1-a×z-1)
where a is the coefficient and z is the delay.
28. A non-transitory computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the dc-offset processing method according to any one of claims 1 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911115142.1A CN112804170B (en) | 2019-11-14 | 2019-11-14 | DC offset processing method and receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911115142.1A CN112804170B (en) | 2019-11-14 | 2019-11-14 | DC offset processing method and receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112804170A true CN112804170A (en) | 2021-05-14 |
| CN112804170B CN112804170B (en) | 2022-06-21 |
Family
ID=75803838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911115142.1A Active CN112804170B (en) | 2019-11-14 | 2019-11-14 | DC offset processing method and receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112804170B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067537A (en) * | 2008-04-25 | 2011-05-18 | 无线技术解决方案有限责任公司 | Wireless communication unit and method for DC offset estimation |
| US20110142113A1 (en) * | 2009-12-11 | 2011-06-16 | Renesas Electronics Corporation | Communication apparatus |
| CN102916694A (en) * | 2012-10-29 | 2013-02-06 | 大唐移动通信设备有限公司 | Conditioning method and device for local oscillator signals |
| US9413574B1 (en) * | 2012-08-01 | 2016-08-09 | Marvell International Ltd. | Systems and methods for DC offset correction |
| CN109495418A (en) * | 2018-12-27 | 2019-03-19 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Ofdm signal synchronous method, device and computer readable storage medium |
-
2019
- 2019-11-14 CN CN201911115142.1A patent/CN112804170B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102067537A (en) * | 2008-04-25 | 2011-05-18 | 无线技术解决方案有限责任公司 | Wireless communication unit and method for DC offset estimation |
| US20110142113A1 (en) * | 2009-12-11 | 2011-06-16 | Renesas Electronics Corporation | Communication apparatus |
| US9413574B1 (en) * | 2012-08-01 | 2016-08-09 | Marvell International Ltd. | Systems and methods for DC offset correction |
| CN102916694A (en) * | 2012-10-29 | 2013-02-06 | 大唐移动通信设备有限公司 | Conditioning method and device for local oscillator signals |
| CN109495418A (en) * | 2018-12-27 | 2019-03-19 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Ofdm signal synchronous method, device and computer readable storage medium |
Non-Patent Citations (2)
| Title |
|---|
| MITSUBISHI ELECTRIC: "R1-061950 "DC offset avoidance techniques in E-UTRA uplink and downlink"", 《3GPP TSG_RAN\WG1_RL1》 * |
| 方芳: ""OFDM系统中载波频率偏移和直流偏移估计算法的研究"", 《中国优秀硕士学位论文全文数据库》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112804170B (en) | 2022-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102209052B (en) | Method and device for carrying out frequency offset compensation on random access signals | |
| CN110099022B (en) | Multipath time delay estimation method and device | |
| US9444664B2 (en) | Channel frequency offset estimation method, apparatus, and system | |
| CN101729461B (en) | System and method for eliminating single-frequency interference and multi-frequency interference | |
| JP5360205B2 (en) | Apparatus and method for evaluating Doppler spread in a mobile communication terminal | |
| US9231811B2 (en) | Receiver device, transmit/receive terminal, propagation delay time measurement method and computer program | |
| EP3758240B1 (en) | Method and apparatus for power line communication | |
| EP3753213B1 (en) | Frequency estimation in a wireless communication network for power grid control | |
| CN110401610A (en) | Ofdm system anti-disturbance method, device and electronic equipment and storage medium | |
| CN101364846B (en) | Sub-carrier noise power estimation method based on pilot | |
| CN112804170B (en) | DC offset processing method and receiver | |
| JP2019519947A (en) | Improved channel estimation in OFDM communication system | |
| CN108900445A (en) | A kind of method and device of signal code rate estimation | |
| US11329794B2 (en) | Method and device for transmitting and receiving signal on basis of full duplex communication | |
| US20110310945A1 (en) | Radio communication apparatus and radio communication method | |
| JP2016131352A (en) | Communication device, communication method, and communication program | |
| US9197474B2 (en) | OFDM communication system | |
| CN107018100B (en) | Time domain denoising method and device | |
| JP5349206B2 (en) | Intercarrier interference canceling apparatus and intercarrier interference canceling method | |
| CN109818885B (en) | Channel estimation method, device, equipment and computer readable storage medium | |
| CN109155769A (en) | A kind of clipping method and equipment of orthogonal frequency division multiplexing | |
| EP3035567B1 (en) | Method and apparatus for noise power estimation | |
| CN111181886A (en) | Frequency offset estimation method and device | |
| CN105162743B (en) | A kind of fixed point detection method for SRS signal in LTE | |
| CN117014278B (en) | Integer frequency offset estimation method, device and storage medium |
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 |