CN113347127A - Direct current estimation method and device and user equipment - Google Patents
Direct current estimation method and device and user equipment Download PDFInfo
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- CN113347127A CN113347127A CN202110695953.4A CN202110695953A CN113347127A CN 113347127 A CN113347127 A CN 113347127A CN 202110695953 A CN202110695953 A CN 202110695953A CN 113347127 A CN113347127 A CN 113347127A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/06—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
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Abstract
The invention provides a direct current estimation method, a direct current estimation device and user equipment. The method comprises the following steps: acquiring frequency domain data of a reference signal transmitted by a base station on a first direct current subcarrier after the reference signal passes through a wireless channel and is superposed with direct current; reconstructing a transmitting end signal which is received on the first direct current subcarrier and passes through a wireless channel to obtain a reconstructed signal; and determining a direct current estimation value according to the frequency domain data and the reconstruction signal. The invention can accurately estimate the direct current, and further, the direct current elimination is carried out by utilizing the accurately estimated direct current so as to improve the receiving performance.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a direct current estimation method, an apparatus, and a user equipment.
Background
In the wireless communication process, when a base station transmits signals and a UE receives signals, Direct Current (DC) occurs due to local oscillator leakage in up and down conversion, and the occurrence of DC may cause distortion of the phase and amplitude of signals on a DC subcarrier, thereby causing degradation of receiving performance. To improve reception performance, the UE needs to estimate and cancel the generated direct current.
Currently, the way to estimate the dc is: the UE averages symbols where DMRS (De-modulated Reference Signal) is located in a time domain to obtain a dc value. In an NR (New Radio, New air interface) system, since a modulated signal exists on a dc subcarrier, an estimated dc value includes the modulated signal, so that an estimation result of the dc value is inaccurate and a large error exists, and when the dc value is removed using the inaccurate dc value, the receiving performance is deteriorated.
Disclosure of Invention
The direct current estimation method, the direct current estimation device and the user equipment can accurately estimate the direct current, and further utilize the accurately estimated direct current to eliminate the direct current so as to improve the receiving performance.
In a first aspect, the present invention provides a dc estimation method, including:
acquiring frequency domain data of a reference signal transmitted by a base station on a first direct current subcarrier after the reference signal passes through a wireless channel and is superposed with direct current;
reconstructing a transmitting end signal which is received on the first direct current subcarrier and passes through a wireless channel to obtain a reconstructed signal;
and determining a direct current estimation value according to the frequency domain data and the reconstruction signal.
Optionally, the reconstructing the transmitting end signal received on the first dc subcarrier after passing through the wireless channel to obtain a reconstructed signal includes:
acquiring a reference signal transmitted by a base station on the first direct current subcarrier;
acquiring a channel estimation value of the first direct current subcarrier on a frequency domain;
and multiplying the reference signal transmitted by the base station on the first direct current subcarrier by the channel estimation value of the first direct current subcarrier on the frequency domain to obtain a reconstructed signal.
Optionally, the determining a dc estimation value according to the frequency domain data and the reconstructed signal includes:
performing an inversion operation on the reconstructed signal;
and adding the frequency domain data and the reconstructed signal subjected to the negation operation to obtain a direct current estimated value.
Optionally, the acquiring, on the first dc subcarrier, frequency-domain data obtained by passing a reference signal transmitted by the base station through a wireless channel and superimposing a dc signal includes: acquiring a complex number of a reference signal transmitted by a base station on a first direct current subcarrier after the reference signal passes through a wireless channel and is superposed with direct current;
and the reference signal transmitted by the base station on the first direct current subcarrier is a QPSK modulated complex number.
In a second aspect, the present invention provides a dc estimation apparatus, comprising:
the acquisition unit is used for acquiring frequency domain data of a reference signal transmitted by a base station on a first direct current subcarrier after the reference signal passes through a wireless channel and is superposed with direct current;
a reconstruction unit, configured to reconstruct a transmitting end signal received on the first dc subcarrier and passing through a wireless channel, to obtain a reconstructed signal;
and the determining unit is used for determining a direct current estimated value according to the frequency domain data and the reconstructed signal.
Optionally, the reconstruction unit comprises:
a first obtaining module, configured to obtain a reference signal transmitted by a base station on the first dc subcarrier;
a second obtaining module, configured to obtain a channel estimation value of the first dc subcarrier in a frequency domain;
a first calculating module, configured to multiply a reference signal transmitted by the base station on the first dc subcarrier by a channel estimation value of the first dc subcarrier on the frequency domain to obtain a reconstructed signal.
Optionally, the determining unit includes:
the second calculation module is used for carrying out negation operation on the reconstructed signal;
and the third calculation module is used for adding the frequency domain data and the reconstructed signal after the inversion operation to obtain a direct current estimation value.
In a third aspect, the present invention provides a user equipment, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the above-described direct current estimation method.
In a fourth aspect, the present invention provides a chip, where the chip is located in a user equipment, and the chip includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the above-described direct current estimation method.
In a fifth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions, when executed by a processor, implement the above direct current estimation method.
According to the direct current estimation method, the direct current estimation device and the user equipment, the generated direct current can be accurately estimated according to the frequency domain data obtained by acquiring the reference signal transmitted by the base station on the direct current subcarrier after passing through the wireless channel and superposing the direct current and the reconstructed signal obtained by reconstructing the transmitting end signal received on the direct current subcarrier after passing through the wireless channel, and then the direct current is eliminated by using the accurately estimated direct current, so that the receiving performance can be improved.
Drawings
FIG. 1 is a flow chart of a DC estimation method according to an embodiment of the present invention;
FIG. 2 is a flow chart of a DC estimation method according to another embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a DC estimation device according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a DC estimation device according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a dc estimation device according to still another embodiment of the 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
An embodiment of the present invention provides a direct current estimation method, which is applied to a UE, and as shown in fig. 1, the method includes:
s11, the UE acquires the frequency domain data of the reference signal transmitted by the base station through the wireless channel and superposed with the direct current on the first direct current subcarrier.
And S12, the UE reconstructs the transmitting terminal signal which is received on the first direct current subcarrier and passes through the wireless channel, and a reconstructed signal is obtained.
And S13, the UE determines a direct current estimated value according to the frequency domain data and the reconstructed signal.
According to the direct current estimation method provided by the embodiment of the invention, the generated direct current can be accurately estimated according to the frequency domain data obtained by acquiring the reference signal transmitted by the base station on the direct current subcarrier after passing through the wireless channel and superposing the direct current and the reconstructed signal obtained by reconstructing the transmitting end signal received on the direct current subcarrier after passing through the wireless channel, and then the direct current is eliminated by using the accurately estimated direct current, so that the receiving performance can be improved.
The dc estimation method of the present invention will be described in detail with reference to specific embodiments.
As shown in fig. 2, the dc estimation method includes:
s21, the UE acquires, on the first dc subcarrier, frequency-domain data Y (l, rx, m) obtained by superimposing the dc on the reference signal transmitted by the base station through the wireless channel.
Specifically, the UE obtains a complex number Y (l, rx, m) on a dc subcarrier on which a base station transmits a reference signal on a dc subcarrier with an OFDM (Orthogonal Frequency Division Multiplexing) symbol index l, a receiving antenna index rx, and a dc Resource Element (RE) index m, where the dc is located, via a radio channel and superimposed with a dc.
S22, the UE acquires the reference signal R (l, rx, m) transmitted by the base station on the first direct current subcarrier.
Specifically, R (l, rx, m) is a reference signal transmitted by the base station on a dc subcarrier with an OFDM symbol index of l, a receiving antenna index of rx, and a dc resource unit index of m, and is a QPSK (Quadrature Phase Shift Keying) modulated complex number.
S23, the UE obtains the channel estimation H (l, rx, m) of the first dc subcarrier in the frequency domain.
Specifically, H (l, rx, m) is a complex number obtained by performing channel estimation on a dc subcarrier with an OFDM symbol index of l, a receiving antenna index of rx, and a resource element index of m in which a dc is located in the frequency domain, and is obtained by filtering channel estimation of an adjacent DMRS reference signal.
S24, the UE multiplies the reference signal R (l, rx, m) transmitted by the base station on the first dc subcarrier by the channel estimation value H (l, rx, m) of the first dc subcarrier on the frequency domain, so as to obtain a reconstructed signal a (l, rx, m).
The specific calculation formula is as follows: a (l, rx, m) ═ R (l, rx, m) × H (l, rx, m)
Wherein A (l, rx, m) is the product of two complex numbers of R (l, rx, m) and H (l, rx, m).
S25, the UE inverts the reconstructed signal A (l, rx, m).
Specifically, a (l, rx, m) obtained in step S24 is inverted to obtain-a (l, rx, m).
S26, the UE adds the complex number Y (l, rx, m) obtained in step S21 to-a (l, rx, m) obtained in step S25 to obtain a dc estimated value.
Since the receiving end signal Y (l, rx, m) is composed of the transmitting end signal passing through the channel and the direct current, that is: therefore, since Y (l, rx, m) ═ R (l, rx, m) × H (l, rx, m) + DC, i.e., a DC estimated value, can be obtained by adding Y (l, rx, m) to-a (l, rx, m).
According to the direct current estimation method provided by the embodiment of the invention, the generated direct current can be accurately estimated according to the frequency domain data obtained by acquiring the reference signal transmitted by the base station on the direct current subcarrier after passing through the wireless channel and superposing the direct current and the reconstructed signal obtained by reconstructing the transmitting end signal received on the direct current subcarrier after passing through the wireless channel, and then the direct current is eliminated by using the accurately estimated direct current, so that the receiving performance can be improved.
An embodiment of the present invention further provides a dc estimation apparatus, as shown in fig. 3, the apparatus includes:
an obtaining unit 11, configured to obtain, on a first dc subcarrier, frequency domain data obtained by superimposing a dc on a reference signal transmitted by a base station through a wireless channel;
a reconstructing unit 12, configured to reconstruct a transmitting end signal received on the first dc subcarrier and passing through a wireless channel, so as to obtain a reconstructed signal;
a determining unit 13, configured to determine a dc estimated value according to the frequency domain data and the reconstructed signal.
According to the direct current estimation device provided by the embodiment of the invention, the generated direct current can be accurately estimated according to the frequency domain data obtained by acquiring the reference signal transmitted by the base station on the direct current subcarrier after passing through the wireless channel and superposing the direct current and the reconstructed signal obtained by reconstructing the transmitting end signal received on the direct current subcarrier after passing through the wireless channel, and then the direct current is eliminated by using the accurately estimated direct current, so that the receiving performance can be improved.
Alternatively, as shown in fig. 4, the reconstruction unit 12 includes:
a first obtaining module 121, configured to obtain a reference signal transmitted by a base station on the first dc subcarrier;
a second obtaining module 122, configured to obtain a channel estimation value of the first dc subcarrier in a frequency domain;
a first calculating module 123, configured to multiply the reference signal transmitted by the base station on the first dc subcarrier by the channel estimation value of the first dc subcarrier on the frequency domain to obtain a reconstructed signal.
Optionally, as shown in fig. 5, the determining unit 13 includes:
a second calculating module 131, configured to perform an inverting operation on the reconstructed signal;
and a third calculating module 132, configured to add the frequency domain data to the reconstructed signal after the negation operation, so as to obtain a dc estimated value.
Optionally, the obtaining unit 11 is specifically configured to obtain a complex number obtained by obtaining, on a first direct current subcarrier, that a reference signal transmitted by a base station passes through a wireless channel and is superimposed with a direct current;
and the reference signal transmitted by the base station on the first direct current subcarrier is a QPSK modulated complex number.
The apparatus of this embodiment may be configured to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
An embodiment of the present invention further provides a user equipment, where the user equipment includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the above-described direct current estimation method.
An embodiment of the present invention further provides a chip, where the chip is located in a user equipment, and the chip includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the above-described direct current estimation method.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and the computer instructions, when executed by a processor, implement the above direct current estimation method.
In the embodiment of the present invention, the dc estimation method may be performed by: a chip or chip module; the dc estimation device may be, for example: a chip or a chip module.
Each module/unit included in each apparatus and product described in the above embodiments may be a software module/unit, or may also be a hardware module/unit, or may also be a part of a software module/unit and a part of a hardware module/unit. For example, for each device or product applied to or integrated into a chip, each module/unit included in the device or product may be implemented by hardware such as a circuit, or at least a part of the module/unit may be implemented by a software program running on a processor integrated within the chip, and the rest (if any) part of the module/unit may be implemented by hardware such as a circuit; for each device or product applied to or integrated with the chip module, each module/unit included in the device or product may be implemented by using hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components of the chip module, or at least some of the modules/units may be implemented by using a software program running on a processor integrated within the chip module, and the rest (if any) of the modules/units may be implemented by using hardware such as a circuit; for each apparatus and product applied to or integrated in the user equipment, each module/unit included in the apparatus and product may be implemented by hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components in the user equipment, or at least part of the modules/units may be implemented by a software program running on a processor integrated in the user equipment, and the rest (if any) part of the modules/units may be implemented by hardware such as a circuit.
It will be understood by those skilled in the art that all or part of the processes of the embodiments of the methods described above may be implemented by a computer program, which may be stored in a computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for dc estimation, the method comprising:
acquiring frequency domain data of a reference signal transmitted by a base station on a first direct current subcarrier after the reference signal passes through a wireless channel and is superposed with direct current;
reconstructing a transmitting end signal which is received on the first direct current subcarrier and passes through a wireless channel to obtain a reconstructed signal;
and determining a direct current estimation value according to the frequency domain data and the reconstruction signal.
2. The method of claim 1, wherein the reconstructing the wireless-channel-passed transmitting-end signal received on the first dc subcarrier to obtain a reconstructed signal comprises:
acquiring a reference signal transmitted by a base station on the first direct current subcarrier;
acquiring a channel estimation value of the first direct current subcarrier on a frequency domain;
and multiplying the reference signal transmitted by the base station on the first direct current subcarrier by the channel estimation value of the first direct current subcarrier on the frequency domain to obtain a reconstructed signal.
3. The method of claim 2, wherein determining the dc estimate from the frequency domain data and the reconstructed signal comprises:
performing an inversion operation on the reconstructed signal;
and adding the frequency domain data and the reconstructed signal subjected to the negation operation to obtain a direct current estimated value.
4. The method according to claim 2 or 3, wherein the acquiring, on the first dc subcarrier, frequency-domain data obtained by superimposing, on a dc subcarrier, a reference signal transmitted by a base station via a radio channel comprises: acquiring a complex number of a reference signal transmitted by a base station on a first direct current subcarrier after the reference signal passes through a wireless channel and is superposed with direct current;
and the reference signal transmitted by the base station on the first direct current subcarrier is a QPSK modulated complex number.
5. A direct current estimation apparatus, comprising:
the acquisition unit is used for acquiring frequency domain data of a reference signal transmitted by a base station on a first direct current subcarrier after the reference signal passes through a wireless channel and is superposed with direct current;
a reconstruction unit, configured to reconstruct a transmitting end signal received on the first dc subcarrier and passing through a wireless channel, to obtain a reconstructed signal;
and the determining unit is used for determining a direct current estimated value according to the frequency domain data and the reconstructed signal.
6. The apparatus according to claim 5, wherein the reconstruction unit comprises:
a first obtaining module, configured to obtain a reference signal transmitted by a base station on the first dc subcarrier;
a second obtaining module, configured to obtain a channel estimation value of the first dc subcarrier in a frequency domain;
a first calculating module, configured to multiply a reference signal transmitted by the base station on the first dc subcarrier by a channel estimation value of the first dc subcarrier on the frequency domain to obtain a reconstructed signal.
7. The apparatus of claim 6, wherein the determining unit comprises:
the second calculation module is used for carrying out negation operation on the reconstructed signal;
and the third calculation module is used for adding the frequency domain data and the reconstructed signal after the inversion operation to obtain a direct current estimation value.
8. A user equipment, the user equipment comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 4.
9. A chip, the chip being located at a user equipment, the chip comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 4.
10. A computer readable storage medium, wherein the computer readable storage medium stores computer instructions which, when executed by a processor, implement the method of any one of claims 1 to 4.
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| 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 |
| CN102118333A (en) * | 2011-03-22 | 2011-07-06 | 华为技术有限公司 | Method and device for canceling DC offsets |
| CN103701732A (en) * | 2014-01-10 | 2014-04-02 | 上海创远仪器技术股份有限公司 | Method for estimating IQ origin offset and direct current offset in communication system |
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- 2021-06-23 CN CN202110695953.4A patent/CN113347127A/en active Pending
Patent Citations (3)
| 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 |
| CN102118333A (en) * | 2011-03-22 | 2011-07-06 | 华为技术有限公司 | Method and device for canceling DC offsets |
| CN103701732A (en) * | 2014-01-10 | 2014-04-02 | 上海创远仪器技术股份有限公司 | Method for estimating IQ origin offset and direct current offset in communication system |
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Application publication date: 20210903 |