CN115412408A - Method and device for determining channel noise power, electronic equipment and storage medium - Google Patents
Method and device for determining channel noise power, electronic equipment and storage medium Download PDFInfo
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- CN115412408A CN115412408A CN202111649657.7A CN202111649657A CN115412408A CN 115412408 A CN115412408 A CN 115412408A CN 202111649657 A CN202111649657 A CN 202111649657A CN 115412408 A CN115412408 A CN 115412408A
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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
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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- H—ELECTRICITY
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- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a method and a device for determining channel noise power, electronic equipment and a storage medium. The determining method comprises the following steps: receiving a multi-carrier modulation signal, extracting a first pilot symbol of a pilot subcarrier in the multi-carrier modulation signal, determining initial channel estimation based on the first pilot symbol and a second pilot symbol of a local receiver, performing timing compensation on the initial channel estimation, and determining noise power of a communication channel for transmitting the multi-carrier modulation signal based on the initial channel estimation after the timing compensation. The invention solves the technical problems of complex calculation mode and large calculation error of the channel noise power in the related technology, which causes inaccurate obtained channel noise power.
Description
Technical Field
The present invention relates to the field of data processing technologies, and in particular, to a method and an apparatus for determining channel noise power, an electronic device, and a storage medium.
Background
In the related art, when channel noise of a communication channel is estimated and filtered, the initial channel estimation is often filtered to obtain a noise-filtered channel estimation, and then the noise-filtered channel estimation is removed from the initial channel estimation, so as to obtain noise power. However, this processing method not only complicates the filtering process, but also has a large error in the obtained noise-filtered channel estimation when the signal-to-noise ratio is low, and therefore, the calculated noise power is not accurate.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining channel noise power, electronic equipment and a storage medium, which are used for at least solving the technical problems that the channel noise power is calculated in a complex way and has larger calculation error in the related technology, so that the obtained channel noise power is inaccurate.
According to an aspect of the embodiments of the present invention, there is provided a method for determining channel noise power, including: receiving a multi-carrier modulation signal and extracting a first pilot symbol of a pilot subcarrier in the multi-carrier modulation signal; determining an initial channel estimate based on the first pilot symbols and second pilot symbols of a local receiver; performing timing compensation on the initial channel estimate; determining a noise power of a communication channel transmitting the multi-carrier modulated signal based on the initial channel estimate after timing compensation.
Optionally, the step of extracting the first pilot symbol of the pilot subcarrier in the multicarrier modulation signal includes: acquiring index information about a certain target pilot frequency subcarrier in the multi-carrier modulation signal; and extracting the pilot frequency symbol of the target pilot frequency subcarrier by adopting the index information to obtain the first pilot frequency symbol.
Optionally, the step of obtaining index information about a target pilot subcarrier in the multicarrier modulation signal includes: determining a total number of subcarriers of pilot subcarriers contained in the multicarrier modulation signal; and extracting index information about the certain target pilot frequency subcarrier in the multi-carrier modulation signal based on the total number of the subcarriers.
Optionally, the step of performing timing compensation on the initial channel estimate includes: calculating an association parameter between the target pilot subcarrier and an adjacent next pilot subcarrier based on the initial channel estimation; acquiring a carrier interval between the target pilot frequency subcarrier and the adjacent next pilot frequency subcarrier; pre-estimating the timing advance based on the correlation parameters, the carrier intervals and the number of conversion points of the multi-carrier modulation signals; and performing timing compensation on the initial channel estimation by adopting the timing advance.
Optionally, the timing advance is used to indicate an offset of a start of symbol bit of the first pilot symbol relative to a start of symbol bit of a second pilot symbol of the local receiver.
Optionally, the step of determining the noise power of the communication channel transmitting the multicarrier modulation signal based on the initial channel estimation after timing compensation comprises: acquiring the target carrier number of pilot subcarriers used for calculating the noise power in a preset time period; determining an adjustment coefficient corresponding to the number of the target carriers; and determining the noise power of a communication channel for transmitting the multi-carrier modulation signal by adopting the total number of the sub-carriers of the pilot sub-carriers contained in the multi-carrier modulation signal, the target number of the sub-carriers and the adjustment coefficient.
Optionally, the step of determining a noise power of a communication channel transmitting the multicarrier modulation signal based on the initial channel estimate after timing compensation comprises: and determining the noise power of the communication channel by adopting a differential calculation strategy based on the initial channel estimation after timing compensation.
According to another aspect of the embodiments of the present invention, there is also provided a device for determining channel noise power, including: the device comprises an extraction unit, a receiving unit and a processing unit, wherein the extraction unit is used for receiving a multi-carrier modulation signal and extracting a first pilot frequency symbol of a pilot frequency subcarrier in the multi-carrier modulation signal; a first determining unit, configured to determine an initial channel estimate based on the first pilot symbol and a second pilot symbol of a local receiver; a compensation unit, configured to perform timing compensation on the initial channel estimation; a second determining unit, configured to determine a noise power of a communication channel transmitting the multicarrier modulation signal based on the initial channel estimation after timing compensation.
Optionally, the extraction unit comprises: a first obtaining module, configured to obtain index information about a target pilot subcarrier in the multicarrier modulation signal; and the first extraction module is used for extracting the pilot frequency symbol of the target pilot frequency subcarrier by adopting the index information to obtain the first pilot frequency symbol.
Optionally, the first obtaining module includes: a first determining submodule, configured to determine a total number of subcarriers of pilot subcarriers included in the multicarrier modulation signal; a first extracting sub-module, configured to extract index information about the certain target pilot subcarrier from the multicarrier modulation signal based on the total number of subcarriers.
Optionally, the compensation unit comprises: a first calculating module, configured to calculate an association parameter between the target pilot subcarrier and an adjacent next pilot subcarrier based on the initial channel estimation; a second obtaining module, configured to obtain a carrier spacing between the target pilot subcarrier and a next adjacent pilot subcarrier; the first pre-estimation module is used for pre-estimating the timing advance based on the correlation parameters, the carrier intervals and the conversion point number of the multi-carrier modulation signal; and the first compensation module is used for performing timing compensation on the initial channel estimation by adopting the timing advance.
Optionally, the timing advance is used to indicate an offset of a start of symbol bit of the first pilot symbol relative to a start of symbol bit of a second pilot symbol of the local receiver.
Optionally, the second determining unit includes: a third obtaining module, configured to obtain a target carrier number of pilot subcarriers used when the noise power is calculated within a preset time period; a first determining module, configured to determine an adjustment coefficient corresponding to the number of target carriers; a second determining module, configured to determine a noise power of a communication channel transmitting the multicarrier modulation signal by using the total number of subcarriers of pilot subcarriers included in the multicarrier modulation signal, the target number of carriers, and the adjustment coefficient.
Optionally, the second determining unit further includes: and a third determining module, configured to determine, based on the initial channel estimation after timing compensation, a noise power of the communication channel by using a differential calculation strategy.
According to another aspect of the embodiments of the present invention, there is also provided an electronic device, including: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to perform the method of determining channel noise power described above via execution of the executable instructions.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for determining channel noise power described above.
In the disclosure, a multi-carrier modulation signal is received, a first pilot symbol of a pilot sub-carrier in the multi-carrier modulation signal is extracted, an initial channel estimation is determined based on the first pilot symbol and a second pilot symbol of a local receiver, the initial channel estimation is subjected to timing compensation, and noise power of a communication channel for transmitting the multi-carrier modulation signal is determined based on the initial channel estimation after the timing compensation. In the method and the device, the noise power of the communication channel can be accurately calculated by performing timing compensation on the obtained initial channel estimation, the calculation process is simple, the accuracy of the calculated result is high, and the method and the device are also suitable for calculating the noise power of the communication channel with the low signal-to-noise ratio, so that the technical problem that the obtained channel noise power is inaccurate due to the fact that the calculation mode of the channel noise power is complex and the calculation error is large in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of an alternative method of determining channel noise power in accordance with an embodiment of the present invention;
fig. 2 is a schematic diagram of an alternative channel noise power determination apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
To facilitate an understanding of the invention by those skilled in the art, the following explanation of some terms or nouns involved in the various embodiments of the invention follows:
OFDM (Orthogonal Frequency Division Multiplexing), which is an Orthogonal Frequency Division Multiplexing technology, is one of multicarrier modulation, and realizes parallel transmission of high-speed serial data through Frequency Division Multiplexing, so that the OFDM has a good multipath fading resistance, and can support multi-user access.
The following embodiments of the present invention can be applied to a system/device/application for determining channel noise power, and can calculate the channel estimation noise power in an OFDM system.
The present invention will be described in detail with reference to examples.
Example one
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for determining channel noise power, it is noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than that presented herein.
Fig. 1 is a flowchart of an alternative method for determining channel noise power according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
step S102, receiving the multi-carrier modulation signal, and extracting a first pilot symbol of a pilot subcarrier in the multi-carrier modulation signal.
Step S104, based on the first pilot symbol and the second pilot symbol of the local receiver, determining the initial channel estimation.
Step S106, timing compensation is carried out on the initial channel estimation.
Step S108, based on the initial channel estimation after timing compensation, determining the noise power of the communication channel for transmitting the multi-carrier modulation signal.
Through the steps, the multi-carrier modulation signal can be received, the first pilot frequency symbol of the pilot frequency sub-carrier in the multi-carrier modulation signal is extracted, the initial channel estimation is determined based on the first pilot frequency symbol and the second pilot frequency symbol of the local receiver, the timing compensation is carried out on the initial channel estimation, and the noise power of the communication channel for transmitting the multi-carrier modulation signal is determined based on the initial channel estimation after the timing compensation. In the embodiment of the invention, the noise power of the communication channel can be accurately calculated by performing timing compensation on the obtained initial channel estimation, the calculation process is simple, the accuracy of the calculated result is higher, and the method is also suitable for calculating the noise power of the communication channel with a low signal-to-noise ratio, so that the technical problem that the obtained channel noise power is inaccurate due to the complex calculation mode and larger calculation error of the channel noise power in the related technology is solved.
For a carrier communication system, a receiver needs to estimate the noise power of a channel for filtering and equalizing the channel estimation.
The following describes the embodiments of the present invention in detail with reference to the above steps.
Step S102, receiving the multi-carrier modulation signal, and extracting a first pilot symbol of a pilot subcarrier in the multi-carrier modulation signal.
For more types of multicarrier modulation signals, in the embodiment of the present invention, orthogonal frequency division multiplexing OFDM is taken as an example for schematic description. In this embodiment, the noise power may be estimated using pilot symbols, and a transmission/reception model of a certain subcarrier of the multicarrier modulation signal (in this embodiment, an OFDM signal is described) in this embodiment is shown in formula (1):
r k ＝h k P k +w k k＝0，1...K-1 (1)；
wherein, P k 、h k 、w k Transmission pilot data, channel coefficient and noise data, r, for the k-th sub-carrier respectively k Is the data of the k-th sub-carrier received.
In this embodiment, a multi-carrier modulation signal in a communication system may be received, and a first pilot symbol of a pilot sub-carrier in the multi-carrier modulation signal may be extracted (that is, the pilot symbol is a pilot symbol extracted from a carrier modulation signal).
Optionally, the step of extracting the first pilot symbol of the pilot subcarrier in the multicarrier modulation signal includes: acquiring index information about a certain target pilot frequency subcarrier in a multi-carrier modulation signal; and extracting the pilot frequency symbol of the target pilot frequency subcarrier by adopting the index information to obtain a first pilot frequency symbol.
In the embodiment of the present invention, the receiver extracts the pilot symbol r from the multi-carrier modulation signal, specifically: index information about a target pilot subcarrier in the multi-carrier modulation signal can be obtained, and then the index information is adopted to extract the pilot symbol of the target pilot subcarrier to obtain a first pilot symbol (which can be r k Where k is the target pilot subcarrier index).
Optionally, the step of obtaining index information about a target pilot subcarrier in the multicarrier modulation signal includes: determining the total number of subcarriers of pilot subcarriers contained in the multicarrier modulation signal; based on the total number of subcarriers, index information about a certain target pilot subcarrier in the multicarrier modulation signal is extracted.
In the embodiment of the present invention, the total number K of subcarriers of pilot subcarriers contained in the multicarrier modulation signal may be determined, and according to the pilot subcarrier index K =0,1.. K-1, index information about a certain target pilot subcarrier in the multicarrier modulation signal may be extracted based on the total number K of subcarriers.
Step S104, based on the first pilot symbol and the second pilot symbol of the local receiver, determining an initial channel estimation.
In the embodiment of the invention, the receiver can extract the first pilot symbol r k And acquiring local pilot symbols in a local receiver
(i.e., the second pilot symbols), an initial channel estimate is determined, which may be determined by equation (2) as follows:
wherein K is the pilot subcarrier index, and K is the total number of pilot subcarriers.
Step S106, timing compensation is carried out on the initial channel estimation.
Optionally, the step of performing timing compensation on the initial channel estimation includes: based on the initial channel estimation, calculating the correlation parameters between the target pilot frequency subcarrier and the adjacent next pilot frequency subcarrier; acquiring a carrier interval between a target pilot frequency subcarrier and an adjacent next pilot frequency subcarrier; based on the correlation parameters, the carrier interval and the number of conversion points of the multi-carrier modulation signal, pre-estimating the timing advance; and timing compensation is carried out on the initial channel estimation by adopting the timing advance.
In the embodiment of the present invention, the following formula (3) may be adopted to calculate the correlation parameter C between adjacent pilot subcarriers (i.e. the target pilot subcarrier and the adjacent next pilot subcarrier).
Wherein, the first and the second end of the pipe are connected with each other,
for the target pilot sub-carrier or sub-carriers,
and K is the index of the pilot frequency subcarrier and the total number of the pilot frequency subcarriers.
After the carrier spacing d between the target pilot subcarrier and the next adjacent pilot subcarrier is obtained, the timing advance τ may be estimated based on the correlation parameter C, the carrier spacing d, and the number of transform points N of the multicarrier modulation signal (i.e., the number of FFT (fast fourier transform)) by the following formula (4).
After the timing advance τ is obtained, timing compensation may be performed on the initial channel estimation to eliminate the influence of the phase of the time offset on the channel estimation, and the timing compensation may be performed by using the following formula (5):
optionally, the timing advance is used to indicate an offset of a start of symbol bit of the first pilot symbol relative to a start of symbol bit of the second pilot symbol of the local receiver.
In an embodiment of the present invention, the timing advance may indicate an offset of a start of OFDM symbol (i.e., a start of symbol of the first pilot symbol) of the received signal relative to a start of OFDM symbol of the local receiver (i.e., a start of symbol of the second pilot symbol of the local receiver).
Step S108, based on the initial channel estimation after timing compensation, determining the noise power of the communication channel for transmitting the multi-carrier modulation signal.
Optionally, the step of determining the noise power of the communication channel for transmitting the multicarrier modulation signal based on the initial channel estimation after the timing compensation includes: acquiring the target carrier number of pilot subcarriers used when the noise power is calculated in a preset time period; determining an adjustment coefficient corresponding to the number of the target carriers; and determining the noise power of a communication channel for transmitting the multi-carrier modulation signal by adopting the total number of the sub-carriers of the pilot sub-carriers contained in the multi-carrier modulation signal, the number of the target carriers and the adjustment coefficient.
In the embodiment of the present invention, a target carrier number M of pilot subcarriers used when calculating noise power within a preset time period may be obtained first, then an adjustment coefficient α corresponding to the target carrier number is determined according to the target carrier number M, and the noise power of a communication channel for transmitting a multicarrier modulation signal is determined by using the following formula (6), and specifically, the noise power of the communication channel for transmitting the multicarrier modulation signal may be determined by using a total number K of the pilot subcarriers contained in the multicarrier modulation signal, the target carrier number M, and the adjustment coefficient α.
In this embodiment, the target number M of carriers may be an odd number, and M =3 may be taken in practical application, so that the noise power of the communication channel may be calculated by the following formula (7):
optionally, the step of determining the noise power of the communication channel for transmitting the multicarrier modulation signal based on the initial channel estimation after the timing compensation includes: and determining the noise power of the communication channel by adopting a differential calculation strategy based on the initial channel estimation after the timing compensation.
In the embodiment of the present invention, after the initial channel estimation after the timing compensation, the noise power of the communication channel may be determined by using a differential calculation strategy based on the initial channel estimation after the timing compensation.
In the embodiment of the invention, the noise power of the communication channel can be accurately calculated by performing timing compensation on the initial channel estimation, the calculation process is simple, the accuracy of the calculated result is higher, and the method is also suitable for calculating the noise power of the communication channel with low signal-to-noise ratio.
Example two
The apparatus for determining channel noise power provided in this embodiment includes a plurality of implementation units, and each implementation unit corresponds to a respective implementation step in the first embodiment.
Fig. 2 is a schematic diagram of an alternative apparatus for determining channel noise power according to an embodiment of the present invention, and as shown in fig. 2, the apparatus for determining channel noise power may include: an extraction unit 20, a first determination unit 22, a compensation unit 24, a second determination unit 26, wherein,
an extracting unit 20, configured to receive the multi-carrier modulation signal and extract a first pilot symbol of a pilot subcarrier in the multi-carrier modulation signal;
a first determining unit 22 for determining an initial channel estimate based on the first pilot symbols and second pilot symbols of the local receiver;
a compensation unit 24, configured to perform timing compensation on the initial channel estimation;
a second determining unit 26, configured to determine a noise power of a communication channel over which the multicarrier modulation signal is transmitted, based on the initial channel estimate after the timing compensation.
The above-mentioned determining apparatus may receive the multi-carrier modulation signal through the extracting unit 20, extract the first pilot symbols of the pilot subcarriers in the multi-carrier modulation signal, determine the initial channel estimation through the first determining unit 22 based on the first pilot symbols and the second pilot symbols of the local receiver, perform timing compensation on the initial channel estimation through the compensating unit 24, and determine the noise power of the communication channel transmitting the multi-carrier modulation signal through the second determining unit 26 based on the initial channel estimation after the timing compensation. In the embodiment of the invention, the noise power of the communication channel can be accurately calculated by performing timing compensation on the obtained initial channel estimation, the calculation process is simple, the accuracy of the calculated result is higher, and the method is also suitable for calculating the noise power of the communication channel with a low signal-to-noise ratio, so that the technical problem that the obtained channel noise power is inaccurate due to the complex calculation mode and larger calculation error of the channel noise power in the related technology is solved.
Optionally, the extracting unit includes: a first obtaining module, configured to obtain index information about a certain target pilot subcarrier in a multicarrier modulation signal; and the first extraction module is used for extracting the pilot frequency symbol of the target pilot frequency subcarrier by adopting the index information to obtain a first pilot frequency symbol.
Optionally, the first obtaining module includes: a first determining submodule, configured to determine the total number of subcarriers of pilot subcarriers included in a multicarrier modulation signal; and the first extraction submodule is used for extracting the index information about a certain target pilot frequency subcarrier in the multi-carrier modulation signal based on the total number of the subcarriers.
Optionally, the compensation unit includes: a first calculating module, configured to calculate an association parameter between a target pilot subcarrier and an adjacent next pilot subcarrier based on initial channel estimation; a second obtaining module, configured to obtain a carrier spacing between the target pilot subcarrier and an adjacent next pilot subcarrier; the first pre-estimation module is used for pre-estimating the timing advance based on the correlation parameters, the carrier interval and the number of conversion points of the multi-carrier modulation signal; and the first compensation module is used for performing timing compensation on the initial channel estimation by adopting the timing advance.
Optionally, the timing advance is used to indicate an offset of a start of symbol bit of the first pilot symbol relative to a start of symbol bit of the second pilot symbol of the local receiver.
Optionally, the second determining unit includes: a third obtaining module, configured to obtain a target carrier number of pilot subcarriers used when calculating noise power within a preset time period; a first determining module, configured to determine an adjustment coefficient corresponding to the number of target carriers; a second determining module, configured to determine the noise power of a communication channel transmitting the multicarrier modulation signal by using the total number of subcarriers of the pilot subcarriers, the number of target carriers, and the adjustment coefficient included in the multicarrier modulation signal.
Optionally, the second determining unit further includes: and the third determining module is used for determining the noise power of the communication channel by adopting a differential calculation strategy based on the initial channel estimation after the timing compensation.
The above-mentioned determining means may further comprise a processor and a memory, and the above-mentioned extracting unit 20, the first determining unit 22, the compensating unit 24, the second determining unit 26, etc. are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize the corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel may set one or more parameters that determine the noise power of the communication channel over which the multicarrier modulated signal is transmitted by adjusting the kernel parameters.
The memory may include volatile memory in a computer readable medium, random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: receiving a multi-carrier modulation signal, extracting a first pilot symbol of a pilot subcarrier in the multi-carrier modulation signal, determining initial channel estimation based on the first pilot symbol and a second pilot symbol of a local receiver, performing timing compensation on the initial channel estimation, and determining noise power of a communication channel for transmitting the multi-carrier modulation signal based on the initial channel estimation after the timing compensation.
According to another aspect of the embodiments of the present invention, there is also provided an electronic device, including: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to perform the above-described method of determining channel noise power via execution of executable instructions.
According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for determining channel noise power described above.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be an indirect coupling or communication connection through some interfaces, units or modules, and may be electrical or in other forms.
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 position, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present 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 Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (10)
1. A method for determining a channel noise power, comprising:
receiving a multi-carrier modulation signal, and extracting a first pilot symbol of a pilot subcarrier in the multi-carrier modulation signal;
determining an initial channel estimate based on the first pilot symbols and second pilot symbols of a local receiver;
performing timing compensation on the initial channel estimate;
determining a noise power of a communication channel transmitting the multi-carrier modulated signal based on the initial channel estimate after timing compensation.
2. The method of claim 1, wherein the step of extracting the first pilot symbol of the pilot subcarrier in the multicarrier modulation signal comprises:
acquiring index information about a certain target pilot frequency subcarrier in the multi-carrier modulation signal;
and extracting the pilot frequency symbol of the target pilot frequency sub-carrier by adopting the index information to obtain the first pilot frequency symbol.
3. The method according to claim 2, wherein the step of obtaining the index information of the target pilot subcarrier in the multi-carrier modulated signal comprises:
determining a total number of subcarriers of pilot subcarriers contained in the multicarrier modulation signal;
and extracting index information about the certain target pilot frequency subcarrier in the multi-carrier modulation signal based on the total number of the subcarriers.
4. The method of claim 2, wherein the step of timing compensating the initial channel estimate comprises:
calculating an association parameter between the target pilot subcarrier and an adjacent next pilot subcarrier based on the initial channel estimation;
acquiring a carrier interval between the target pilot frequency subcarrier and the adjacent next pilot frequency subcarrier;
pre-estimating the timing advance based on the correlation parameters, the carrier intervals and the number of conversion points of the multi-carrier modulation signals;
and performing timing compensation on the initial channel estimation by adopting the timing advance.
5. The method of claim 4, wherein the timing advance is used to indicate an offset of a start of symbol bit of the first pilot symbol relative to a start of symbol bit of a second pilot symbol of the local receiver.
6. The method of claim 1, wherein the step of determining the noise power of the communication channel over which the multicarrier modulated signal is transmitted based on the initial channel estimate after timing compensation comprises:
acquiring the target carrier number of pilot subcarriers used for calculating the noise power in a preset time period;
determining an adjustment coefficient corresponding to the number of the target carriers;
and determining the noise power of a communication channel for transmitting the multi-carrier modulation signal by adopting the total number of the sub-carriers of the pilot sub-carriers contained in the multi-carrier modulation signal, the target number of the sub-carriers and the adjustment coefficient.
7. The method of claim 1, wherein the step of determining the noise power of the communication channel over which the multicarrier modulated signal is transmitted based on the initial channel estimate after timing compensation comprises:
and determining the noise power of the communication channel by adopting a differential calculation strategy based on the initial channel estimation after timing compensation.
8. An apparatus for determining a channel noise power, comprising:
the device comprises an extraction unit, a first pilot frequency symbol generation unit and a second pilot frequency symbol generation unit, wherein the extraction unit is used for receiving a multi-carrier modulation signal and extracting a first pilot frequency symbol of a pilot frequency subcarrier in the multi-carrier modulation signal;
a first determining unit, configured to determine an initial channel estimate based on the first pilot symbol and a second pilot symbol of a local receiver;
a compensation unit, configured to perform timing compensation on the initial channel estimation;
a second determining unit, configured to determine a noise power of a communication channel transmitting the multicarrier modulation signal based on the initial channel estimation after timing compensation.
9. An electronic device, comprising:
a processor; and
a memory for storing executable instructions of the processor;
wherein the processor is configured to perform the method of determining channel noise power of any one of claims 1 to 7 via execution of the executable instructions.
10. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program is run, the computer-readable storage medium is controlled by a device to perform the method for determining channel noise power according to any one of claims 1 to 7.
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