CN114337868A - Channel parameter estimation method, device, electronic equipment and readable storage medium - Google Patents
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Abstract
The embodiment of the application provides a channel parameter estimation method, a channel parameter estimation device, electronic equipment and a readable storage medium, and relates to the technical field of wireless communication. The method comprises the following steps: according to the method, the independent right related content receiving base station distributes first pilot frequency sub-carriers based on a communication protocol, and obtains distribution information of all the pilot frequency sub-carriers; acquiring second pilot frequency sub-carriers except the first pilot frequency sub-carriers in all the pilot frequency sub-carriers according to the distribution information; determining pilot signals carried by all pilot subcarriers; and performing channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result. The embodiment of the application not only considers the change of the pilot signal borne by the pilot subcarrier received by the terminal, but also considers the change of the pilot subcarrier borne by other terminals, thereby improving the reliability of the signal parameter estimation result and reducing the error of the pilot signal received by the terminal.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a channel parameter estimation method, an apparatus, an electronic device, and a readable storage medium.
Background
Currently, in the field of wireless communication, Wi-Fi6 (sixth generation wireless network communication technology) has been developed and used, Wi-Fi6 mainly uses OFDMA, MU-MIMO and other technologies, OFDMA (Orthogonal Frequency Division Multiple Access) can simultaneously allocate different subcarrier resources to Multiple clients, and MU-MIMO (Multi-User Multiple-Input Multiple-Output) technology allows a router to communicate with Multiple devices at the same time instead of sequentially communicating.
In the prior art, when the OFDMA technology is used in Wi-Fi6, unlike the conventional single user mode, the MU-MIMO technology may be used to simultaneously transmit subcarrier resources to a plurality of user terminals, so as to improve the flexibility of subcarrier resource allocation and the number of user terminals.
However, for one of the ues, the resource of the sub-carriers available to the user is reduced, for example, in a single-user mode, there are 8 pilot sub-carriers available to the ue, and in an OFDMA mode, there are only 2 pilot sub-carriers available to the ue, although the resource requirement of the ue can be met, when performing channel parameter estimation, in the prior art, the reliability of the estimated parameter is low by performing channel parameter estimation based on 2 pilot sub-carriers, which results in a large error of data received by the user.
Disclosure of Invention
Embodiments of the present application provide a method and an apparatus for channel parameter estimation, an electronic device, and a readable storage medium, which can solve the above problems. The technical scheme is as follows:
receiving a first pilot frequency subcarrier distributed by a base station based on a communication protocol, and acquiring distribution information of all pilot frequency subcarriers;
acquiring second pilot frequency sub-carriers except the first pilot frequency sub-carriers in all the pilot frequency sub-carriers according to the distribution information;
determining pilot signals carried by all pilot subcarriers;
and performing channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result.
In a possible implementation manner, performing channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result, includes:
determining a first weight corresponding to a pilot signal carried by each pilot subcarrier;
and performing channel parameter estimation on all pilot signals according to the first weights corresponding to all pilot signals to obtain a first target parameter estimation result, and taking the first target parameter estimation result as a channel parameter estimation result.
In another possible implementation manner, determining a first weight corresponding to a pilot signal carried by each pilot subcarrier includes:
for any one pilot signal, determining the channel quality of the channel transmitting the pilot signal;
if the pilot frequency subcarrier carrying the pilot frequency signal is determined to be the first pilot frequency subcarrier, configuring a first weight value for the pilot frequency signal;
and determining the first weight according to the channel quality and the first weight.
In yet another possible implementation manner, determining a first weight corresponding to each pilot signal further includes:
if the pilot frequency subcarrier carrying the pilot frequency signal is determined to be the second pilot frequency subcarrier, configuring a second weight value for the pilot frequency signal;
determining a first weight according to the channel quality and the second weight;
wherein the first weight is greater than the second weight.
In yet another possible implementation manner, the performing channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result further includes:
dividing all pilot frequency sub-carriers into at least one pilot frequency sub-carrier set according to the distribution object of each pilot frequency sub-carrier;
for any pilot frequency subcarrier set, carrying out channel parameter estimation according to pilot frequency signals carried by each pilot frequency subcarrier in the pilot frequency subcarrier set to obtain a second target channel parameter estimation result of the pilot frequency subcarrier set;
and determining a second weight corresponding to the second target channel parameter estimation result of each pilot subcarrier set, and taking the result after weighted average of the second target channel parameter estimation results of each pilot subcarrier set as a channel parameter estimation result according to the second weight.
In another possible implementation manner, determining the second weight corresponding to each pilot subcarrier set includes:
for any pilot frequency subcarrier set, determining the sum of the channel quality of the channel for transmitting each pilot frequency subcarrier in the pilot frequency subcarrier set;
if the pilot frequency subcarrier in the pilot frequency subcarrier set is determined to be the first pilot frequency subcarrier, configuring a third weight of a second target channel parameter estimation result to the pilot frequency subcarrier set;
and determining a second weight according to the sum of the channel qualities and the third weight.
In yet another possible implementation, the method further includes:
if the pilot frequency subcarrier in the pilot frequency subcarrier set is determined to be the second pilot frequency subcarrier, configuring a fourth weight of a second target channel parameter estimation result to the pilot frequency subcarrier set;
determining a second weight according to the sum of the channel qualities and the fourth weight;
wherein the third weight is greater than the fourth weight.
According to another aspect of the embodiments of the present application, there is provided a channel parameter estimation apparatus, including:
the first acquisition module is used for receiving a first pilot frequency subcarrier distributed by the base station based on a communication protocol and acquiring the distribution information of all the pilot frequency subcarriers;
a second obtaining module, configured to obtain, according to the allocation information, second pilot subcarriers, except for the first pilot subcarrier, of all the pilot subcarriers;
a determining module, configured to determine pilot signals carried by all pilot subcarriers;
and the estimation module is used for estimating channel parameters according to the pilot signals carried by all the pilot subcarriers to obtain a channel parameter estimation result.
According to another aspect of the embodiments of the present application, there is provided an electronic device, which includes a memory, a processor and a computer program stored on the memory, wherein the processor executes the computer program to implement the steps of the channel parameter estimation method described above.
According to still another aspect of embodiments of the present application, there is provided a computer-readable storage medium, and a computer program when executed by a processor, implements the steps of the channel parameter estimation method described above.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
according to the embodiment of the application, the first pilot frequency subcarrier distributed by the base station based on the communication protocol is received, the second pilot frequency subcarrier except the first pilot frequency subcarrier in all the pilot frequency subcarriers sent by the base station is also obtained, the change of the pilot frequency signal borne by the pilot frequency subcarrier received by the terminal is considered, the change of the pilot frequency subcarrier borne by other terminals is also considered, channel parameter estimation is carried out according to the pilot frequency signals borne by all the pilot frequency subcarriers, the reliability of the signal parameter estimation result is improved, and the error of the pilot frequency signal received by the terminal is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below.
Fig. 1 is a schematic diagram of a system architecture for implementing channel parameter estimation according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a channel parameter estimation method according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a pilot subcarrier distribution with a bandwidth of 20M according to an embodiment of the present application;
fig. 4 is a symbol diagram of a pilot signal according to an embodiment of the present application;
fig. 5 is a schematic flow chart of channel parameter estimation according to an embodiment of the present disclosure;
fig. 6 is a schematic flowchart of another channel parameter estimation method according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a channel parameter estimation apparatus according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of an electronic device for channel parameter estimation according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described below in conjunction with the drawings in the present application. It should be understood that the embodiments set forth below in connection with the drawings are exemplary descriptions for explaining technical solutions of the embodiments of the present application, and do not limit the technical solutions of the embodiments of the present application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the terms "comprises" and/or "comprising," when used in this specification in connection with embodiments of the present application, specify the presence of stated features, information, data, steps, operations, elements, and/or components, but do not preclude the presence or addition of other features, information, data, steps, operations, elements, components, and/or groups thereof, as embodied in the art. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein indicates at least one of the items defined by the term, e.g., "a and/or B" may be implemented as "a", or as "B", or as "a and B".
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
The terms referred to in this application will first be introduced and explained:
Wi-Fi6, originally called: the IEEE 802.11.ax, the sixth generation wireless network technology, is the name of the Wi-Fi standard, which is a wireless local area network technology created by the Wi-Fi alliance in the IEEE 802.11 standard, and Wi-Fi6 allows communication with up to 8 devices at the same time, with the highest rate of 9.6 Gbps.
OFDMA (Orthogonal Frequency Division Multiple Access) is a Multiple Access technique, and users Access a system by sharing Frequency band resources through OFDMA.
The STA is generally a client in a WLAN (wireless local area network), and may be a computer equipped with a wireless network card or a smartphone with a WiFi module. The STA may be mobile or fixed, and is the most basic component of the wireless lan.
An AP (Access Point, wireless Access node) mainly provides Access of wireless stations to and from a wired lan, through which wireless stations within the coverage of the Access Point can communicate with each other, such as a router.
RU (Resource unit, Resource block), introducing OFDMA technology into Wi-Fi6, it is necessary to redefine the concept of time-frequency Resource blocks, where these time-frequency resources are mutually intersected, and the resources of the whole channel are divided into small time-frequency Resource blocks of fixed size as pilot subcarrier resources, that is, RU. There are many different sizes of RUs in Wi-Fi6, such as 26-subcarrier RU, 52-subcarrier RU, 106-subcarrier RU, etc., including 26, 52, 106 pilot subcarriers, respectively.
In the prior art, when the OFDMA technology is used in Wi-Fi6, unlike the conventional single user mode, the MU-MIMO technology may be used to simultaneously transmit subcarrier resources to a plurality of user terminals, so as to improve the flexibility of subcarrier resource allocation and the number of user terminals.
However, for one of the ues, the resource of the sub-carriers available to the user is reduced, for example, in a single-user mode, there are 8 pilot sub-carriers available to the ue, and in an OFDMA mode, there are only 2 pilot sub-carriers available to the ue, although the resource requirement of the ue can be met, when performing channel parameter estimation, in the prior art, the reliability of the estimated parameter is low by performing channel parameter estimation based on 2 pilot sub-carriers, which results in a large error of data received by the user.
The present application provides a channel parameter estimation method, an apparatus, an electronic device, and a readable storage medium, which are intended to solve the above technical problems in the prior art.
The technical solutions of the embodiments of the present application and the technical effects produced by the technical solutions of the present application will be described below through descriptions of several exemplary embodiments. It should be noted that the following embodiments may be referred to, referred to or combined with each other, and the description of the same terms, similar features, similar implementation steps and the like in different embodiments is not repeated.
Fig. 1 is a schematic diagram of a system architecture for implementing a channel parameter estimation method according to an embodiment of the present application, where 10, 20, and 30 denote terminals, and 40 denotes a base station, it should be understood that the numbers of the terminals and the base stations in fig. 1 are merely schematic. There may be any number of terminals and base stations according to actual requirements, and users may use the terminals 10, 20, 30 to perform wireless network interaction with the base station 40 to complete estimation of channel parameters.
A terminal, which is a device having a wireless transceiving function in this embodiment of the present application, may be referred to as a terminal (terminal), a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), an access terminal, a vehicle-mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a remote terminal, a mobile device, a UE terminal, a wireless communication device, a UE agent, or a UE apparatus. The terminal device may be fixed or mobile, for example, the terminal device may be a mobile phone (mobile phone), a tablet (pad), a desktop, a notebook, a kiosk, a vehicle-mounted terminal, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety, a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol) phone, a wireless local loop (SIP) phone, a wireless local loop (remote local) terminal, a personal digital assistant (wllocal digital assistant), PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a wearable device, a terminal device in a future mobile communication network or a terminal device in a public mobile land network (PLMN) for future evolution, etc., and the embodiments of the present application are not limited thereto.
An embodiment of the present application provides a channel parameter estimation method, as shown in fig. 2, the method includes:
s101, receiving a first pilot frequency subcarrier distributed by a base station based on a communication protocol, and acquiring distribution information of all pilot frequency subcarriers.
It should be understood that the base station may send the pilot subcarriers to each terminal based on a preset communication protocol, where the communication protocol specifies the available pilot subcarriers of each terminal in the current communication network system, that is, the allocation information of the pilot subcarriers, the allocation information records the corresponding relationship between each terminal and the available pilot subcarriers of the terminal, the base station sends the pilot subcarriers through the system bandwidth, and each terminal receives the corresponding pilot subcarriers according to the communication protocol and parses out the corresponding data for use.
In the embodiment of the present application, for a terminal, after receiving a first pilot subcarrier allocated by a base station based on a communication protocol, the terminal further obtains allocation information of all pilot subcarriers from the base station.
S102, acquiring second pilot frequency sub-carriers except the first pilot frequency sub-carrier in all the pilot frequency sub-carriers according to the distribution information;
after the terminal acquires the allocation information, because all the pilot subcarriers are recorded in the allocation information, the terminal may acquire the second pilot subcarriers other than the first pilot subcarriers from all the pilot subcarriers, it should be understood that the second pilot subcarriers are allocated to other terminals by the base station but are all sent through the system bandwidth, in general, each terminal may parse the pilot signal in the pilot subcarriers specified by the protocol from the system bandwidth, and in this embodiment of the present application, the terminal may also acquire the second pilot subcarriers of other terminals.
S103, determining pilot signals carried by all pilot subcarriers;
one pilot subcarrier is equivalent to one subchannel, the pilot subcarrier transmits a data signal in the form of a wave, the pilot signal refers to a data signal carried in the pilot subcarrier, and after a terminal acquires all the pilot subcarriers, the pilot signal carried by the pilot subcarrier can be demodulated.
In the embodiment of the present application, a pilot subcarrier with a bandwidth of 20M is taken as an example, fig. 3 is a schematic distribution diagram of a pilot subcarrier with a bandwidth of 20M provided in the embodiment of the present application, as shown in fig. 3, each trapezoid represents a pilot subcarrier resource RU of one user terminal, including RU26, RU52, RU106, and RU242, and the trapezoid labeled 1 is a Guard Sub-carrier (Guard Sub-carriers) for inter-channel protection; each arrow represents a pilot subcarrier, and the numbers on the arrows represent the index numbers of the respective pilot subcarriers, including-116, -102, -90, -76, -62, -45, -36, -22, -10, 22, 36, 45, 62, 76, 90, 102, and 116; of which 7DC and 3DC are null direct current subcarriers (DC subcarriers) used as guard bandwidths, 7 in RU26, RU52, RU106, and 3 in RU 242.
S104, channel parameter estimation is carried out according to pilot signals carried by all pilot subcarriers, and channel parameter estimation results are obtained.
It should be understood that, in a communication system, during the transmission of a signal from a transmitting end to a receiving end through a channel, the signal may be affected by a transmission channel, and distortion may occur or various noises may be added to the signal, which may cause the amplitude and phase of the signal to change.
In the embodiment of the present application, after the pilot signal is transmitted to the terminal through the pilot subcarriers, the phase of the pilot signal may also rotate due to time offset and frequency offset, so that the pilot signal changes, and channel parameter estimation may be performed according to the pilot signals carried by all the pilot subcarriers acquired by the terminal, so as to obtain a channel parameter estimation result.
According to the embodiment of the application, the first pilot frequency subcarrier distributed by the base station based on the communication protocol is received, the second pilot frequency subcarrier except the first pilot frequency subcarrier in all the pilot frequency subcarriers sent by the base station is also obtained, the change of the pilot frequency signal borne by the pilot frequency subcarrier received by the terminal is considered, the change of the pilot frequency subcarrier borne by other terminals is also considered, channel parameter estimation is carried out according to the pilot frequency signals borne by all the pilot frequency subcarriers, the reliability of the signal parameter estimation result is improved, and the error of the pilot frequency signal received by the terminal is reduced.
The embodiment of the present application provides a possible implementation manner, which performs channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result, and includes:
determining a first weight corresponding to a pilot signal carried by each pilot subcarrier;
and performing channel parameter estimation on all pilot signals according to the first weights corresponding to all pilot signals to obtain a first target parameter estimation result, and taking the first target parameter estimation result as a channel parameter estimation result.
It should be understood that, in the present terminal, channel parameter estimation is performed according to pilot signals carried by all pilot subcarriers, and due to the difference of the pilot subcarriers, changes, i.e., phase rotations, of the pilot signals carried by the pilot subcarriers are also different, so that, in the embodiment of the present application, a manner is provided for performing channel parameter estimation, i.e., different weights are set for the pilot signals carried by different pilot subcarriers, and are used as the first weight, and specific weight allocation is described in the subsequent embodiments.
After the first weights of the pilot signals carried by each pilot subcarrier are determined, channel parameter estimation may be performed on all the pilot signals by combining the first weights corresponding to all the pilot signals to obtain a first target channel parameter estimation result, and a specific algorithm for performing channel parameter estimation may be a Weighted Least Squares (WLS) algorithm to obtain a unique channel parameter estimation result, or may adopt other weighting algorithms, which is not specifically limited in the embodiments of the present application.
According to the embodiment of the application, the first weight corresponding to the pilot signal carried by each frequency subcarrier is determined, and channel parameter estimation is performed on all the pilot signals according to the first weights corresponding to all the pilot signals, so that the influence of different pilot subcarriers on the pilot signals is considered, and the accuracy of channel parameter estimation is improved.
The embodiment of the present application provides a possible implementation manner, and determining a first weight corresponding to a pilot signal carried by each pilot subcarrier includes:
for any one pilot signal, determining the channel quality of the channel transmitting the pilot signal;
if the pilot frequency subcarrier carrying the pilot frequency signal is determined to be the first pilot frequency subcarrier, configuring a first weight value for the pilot frequency signal;
and determining the first weight according to the channel quality and the first weight.
The channel quality of the channel corresponds to the magnitude of the signal-to-noise ratio of the channel, and characterizes the degree of influence of the channel on the transmission signal, so the channel quality of the channel for transmitting the pilot signal needs to be considered when determining the first weight of any one of the pilot signals.
On the other hand, because the pilot subcarrier received by the terminal is the first pilot subcarrier, the pilot subcarriers received by other terminals are the second pilot subcarriers, and the second pilot subcarriers received by other terminals cannot directly relate to the channel parameter estimation of the first pilot subcarriers received by the terminal, but the phase rotation of the second pilot subcarriers due to the time offset and the frequency offset can be used to estimate parameters such as the time offset, the frequency offset, the common phase difference, and the like of the first pilot subcarriers received by the terminal.
In this embodiment of the present application, if it is determined that the first pilot subcarrier carrying the pilot signal is the first pilot subcarrier, that is, the pilot subcarrier received by the terminal, the first weight preset for the pilot signal is configured, it should be understood that the first weight may be preset according to an actual situation, a first weight is set for the pilot signal carried by each first pilot subcarrier, and after the channel quality and the first weight are determined, the weight corresponding to the pilot signal may be determined according to the channel quality and the first weight.
The embodiment of the present application provides a possible implementation manner, determining a first weight corresponding to each pilot signal, further including:
if the pilot frequency subcarrier carrying the pilot frequency signal is determined to be the second pilot frequency subcarrier, configuring a second weight value for the pilot frequency signal;
determining a first weight according to the channel quality and the second weight;
wherein the first weight is greater than the second weight.
In this embodiment of the present application, if it is determined that the pilot subcarrier carrying the pilot signal is the second pilot subcarrier, that is, the pilot subcarriers received by other terminals except the terminal may be configured with the second weight, and similarly, the second weight may also be preset according to the actual situation.
Then, according to the channel quality that can be determined according to the foregoing embodiments, in combination with the second weight, a weight corresponding to a pilot signal carried by the data second pilot subcarrier is determined, and a specific process of this embodiment is not described in detail herein.
Specifically, an embodiment of the present application further provides a formula for specifically calculating a first weight corresponding to a pilot signal, where the formula (1) is as follows:
wk＝|hk|·αk (1)
wherein, | hkL is the channel quality of the channel transmitting the pilot signal k; alpha is alphakThe first weight value or the second weight value corresponding to the pilot signal k; w is akIs a first weight corresponding to the pilot signal k.
The embodiment of the present application provides a possible implementation manner, which performs channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result, and further includes:
dividing all pilot frequency sub-carriers into at least one pilot frequency sub-carrier set according to the distribution object of each pilot frequency sub-carrier;
for any pilot frequency subcarrier set, carrying out channel parameter estimation according to pilot frequency signals carried by each pilot frequency subcarrier in the pilot frequency subcarrier set to obtain a second target channel parameter estimation result of the pilot frequency subcarrier set;
and determining a second weight corresponding to the second target channel parameter estimation result of each pilot subcarrier set, and taking the result after weighted average of the second target channel parameter estimation results of each pilot subcarrier set as a channel parameter estimation result according to the second weight.
The embodiment of the present application further provides another way of performing channel parameter estimation on all pilot subcarriers, where, based on each terminal, the pilot subcarriers received by each terminal are used as a pilot subcarrier set, that is, all the pilot subcarriers are divided into at least one pilot subcarrier set according to allocation objects of the pilot subcarriers, and the pilot subcarriers in each pilot subcarrier set all belong to the same terminal for reception.
For any pilot subcarrier set, channel parameter estimation may be performed according to pilot signals carried by each pilot subcarrier in the pilot subcarrier set to obtain a second target channel parameter estimation result of the pilot subcarrier set, that is, in this embodiment of the present application, channel parameter estimation is performed on the pilot subcarrier set received by each terminal first to obtain the second target channel parameter result of each terminal.
In the embodiment of the present application, a corresponding second weight is configured for a second target channel parameter result of each pilot subcarrier set, a second target channel parameter estimation result of each pilot subcarrier is weighted-averaged, and a result after weighted-averaging is used as a final channel parameter estimation result.
A possible implementation manner is provided in the embodiment of the present application, and determining the second weight corresponding to each pilot subcarrier set includes:
for any pilot frequency subcarrier set, determining the sum of the channel quality of the channel for transmitting each pilot frequency subcarrier in the pilot frequency subcarrier set;
if the pilot frequency subcarrier in the pilot frequency subcarrier set is determined to be the first pilot frequency subcarrier, configuring a third weight of a second target channel parameter estimation result to the pilot frequency subcarrier set;
and determining a second weight according to the sum of the channel qualities and the third weight.
It should be understood that, for a pilot subcarrier set, the channel quality corresponding to the pilot subcarrier set may be the sum of the channel qualities of the channels transmitting the respective pilot subcarriers in the pilot subcarrier set, and the sum of the channel qualities of the channels of the respective pilot subcarriers is taken as the channel quality of the pilot subcarrier set.
In this embodiment of the present application, if it is determined that the pilot subcarriers in the pilot subcarrier set are the first pilot subcarriers, that is, the pilot subcarrier set is the pilot subcarriers acquired by the terminal, for the second target channel estimation result of the pilot subcarrier set, a third weight is configured, then a second weight is determined according to the channel quality corresponding to the pilot subcarrier set and the third weight, and a product of the channel quality and the third weight may be used as the second weight.
The embodiment of the application provides a possible implementation manner, and the method further comprises the following steps:
if the pilot frequency subcarrier in the pilot frequency subcarrier set is determined to be the second pilot frequency subcarrier, configuring a fourth weight of a second target channel parameter estimation result to the pilot frequency subcarrier set;
determining a second weight according to the sum of the channel qualities and the fourth weight;
wherein the third weight is greater than the fourth weight.
Similarly, in this embodiment of the present application, if it is determined that the pilot subcarriers in the pilot subcarrier set are the second pilot subcarriers, that is, the pilot subcarriers in the pilot subcarrier set are the pilot subcarriers allocated to other terminals, a fourth weight may be configured for the pilot subcarrier set, and then the second weight is determined according to the channel quality corresponding to the pilot subcarrier set and the configured fourth weight.
Specifically, the embodiment of the present application further provides a calculation process for specifically calculating a second weight corresponding to a pilot subcarrier set, which is shown in the following formula (2):
wi＝αi·∑|hk|k∈Ki (2)
wherein, wiA second weight representing a set i of pilot subcarriers; alpha is alphaiRepresenting a third weight or a fourth weight corresponding to the pilot subcarrier set i; | hkL represents the signal quality corresponding to the pilot subcarrier k in the pilot subcarrier set i; kiRepresenting all pilot subcarriers in the pilot subcarrier set i; sigma | hkAnd | represents the sum of the signal qualities corresponding to the pilot subcarriers k in the pilot subcarrier set i.
The embodiment of the present application provides a possible implementation manner, and before performing channel parameter estimation, the method further includes a step of performing channel equalization and phase compensation on a pilot signal carried by a pilot subcarrier.
When channel parameter estimation is performed, channel equalization may be performed based on a predetermined training sequence, that is, when a transmitting end (base station) transmits a pilot signal, a known training sequence is added to the pilot signal, initial channel estimation is performed at a receiving terminal, a training sequence that changes after channel transmission and is received at the receiving terminal is used as a target training sequence, the target training sequence is compared with the known training sequence, and an influence on the pilot signal during channel transmission is determined and recorded as channel information, and specifically, a calculation process for determining channel information is shown in the following formula (3):
hk＝rHELTF，k/preamblek (3)
wherein h iskRepresenting channel information; r isHELTF，kRepresenting a target training sequence in a pilot subcarrier k; preamblekRepresenting a known training sequence.
The specific calculation process for performing channel equalization is shown in the following formula (4):
wherein the content of the first and second substances,
pilot signals carried by pilot subcarriers k after channel equalization; r ispilot，kPilot signals carried for pilot subcarriers k; h iskIndicating the channel information.
It should be understood that, after performing channel equalization, the pilot signal needs to be subjected to phase compensation, and the influence of the symbol of the pilot signal on the pilot signal is extracted, specifically, the process of performing phase compensation is shown in the following formula (5):
wherein the content of the first and second substances,
pilot signals carried by the pilot subcarriers k after phase compensation;
pilot signals carried by pilot subcarriers k after robust and sturdy equalization channels; pilot's injectionkTo be guideThe symbols of the pilot signal carried by frequency subcarrier k.
In the embodiment of the present application, a pilot subcarrier with a bandwidth of 20M is taken as an example, fig. 4 is a schematic symbol diagram of a pilot signal provided in the embodiment of the present application, as shown in fig. 4, each row represents one pilot subcarrier resource, which includes symbols of three pilot subcarrier resources RU26, RU52, and RU106, each column represents one pilot subcarrier, which is identified by an index number and includes-116, -102, -90, -76, -62, -45, -36, -22, -10, 22, 36, 45, 62, 76, 90, 102, and 116, where 1, -1 represents symbols of pilot signals carried by each pilot subcarrier.
The embodiment of the present application further provides an implementation manner, which includes a full process of channel parameter estimation in the embodiment of the present application.
Specifically, fig. 5 is a schematic diagram of a channel parameter estimation process provided in the embodiment of the present application, which is a process of performing channel parameter estimation on pilot signals carried by each pilot subcarrier, and as shown in fig. 5, the process includes determining channel information from the beginning to the end; carrying out channel equalization; determining a symbol of a pilot signal; performing phase compensation; the channel parameter estimation is performed, and specific contents are already described in the foregoing embodiments, which are not described again in this application embodiment.
Fig. 6 is a schematic view of another channel parameter estimation process provided in this embodiment, which is a process of performing channel parameter estimation on pilot signals carried by pilot subcarriers in each pilot subcarrier set, and as shown in fig. 6, the process includes determining channel information from the beginning to the end; carrying out channel equalization; determining a symbol of a pilot signal; performing phase compensation; estimating channel parameters; the weighted average, the specific content of which is described in the above embodiments, is not described again in this application embodiment.
An embodiment of the present application provides a channel parameter estimation apparatus, as shown in fig. 7, the channel parameter estimation apparatus may include: a first acquisition module 110, a second acquisition module 210, a determination module 310, and an estimation module 410, wherein,
a first obtaining module 110, configured to receive a first pilot subcarrier allocated by a base station based on a communication protocol, and obtain allocation information of all pilot subcarriers;
a second obtaining module 210, configured to obtain, according to the allocation information, second pilot subcarriers, except for the first pilot subcarrier, in all the pilot subcarriers;
a determining module 310, configured to determine pilot signals carried by all pilot subcarriers;
the estimating module 410 is configured to perform channel parameter estimation according to the pilot signals carried by all the pilot subcarriers, so as to obtain a channel parameter estimation result.
In one possible implementation, the estimation module 410 includes:
the first weight module is used for determining a first weight corresponding to a pilot signal carried by each pilot subcarrier;
and the first estimation module is used for performing channel parameter estimation on all pilot signals according to the first weights corresponding to all pilot signals to obtain a first target parameter estimation result, and taking the first target parameter estimation result as a channel parameter estimation result.
In another possible implementation, the first weighting module includes:
the first weight module is used for determining the channel quality of a channel for transmitting the pilot signal for any pilot signal;
if the pilot frequency subcarrier carrying the pilot frequency signal is determined to be the first pilot frequency subcarrier, configuring a first weight value for the pilot frequency signal;
and determining the first weight according to the channel quality and the first weight.
In yet another possible implementation manner, the first weighting module further includes:
the second weight module is used for configuring a second weight to the pilot signal if the pilot subcarrier carrying the pilot signal is determined to be the second pilot subcarrier;
determining a first weight according to the channel quality and the second weight;
wherein the first weight is greater than the second weight.
In yet another possible implementation, the estimation module 410 further includes:
the dividing module is used for dividing all pilot frequency sub-carriers into at least one pilot frequency sub-carrier set according to the distribution objects of all pilot frequency sub-carriers;
the second estimation module is used for carrying out channel parameter estimation on any pilot frequency subcarrier set according to pilot frequency signals carried by each pilot frequency subcarrier in the pilot frequency subcarrier set to obtain a second target channel parameter estimation result of the pilot frequency subcarrier set;
and the second weight module is used for determining a second weight corresponding to the second target channel parameter estimation result of each pilot subcarrier set, and taking the result after weighted average of the second target channel parameter estimation results of each pilot subcarrier set as the channel parameter estimation result according to the second weight.
In yet another possible implementation, the second weighting module includes:
the third weight module is used for determining the sum of the channel quality of the channel of each pilot frequency subcarrier in the pilot frequency subcarrier set for any pilot frequency subcarrier set;
if the pilot frequency subcarrier in the pilot frequency subcarrier set is determined to be the first pilot frequency subcarrier, configuring a third weight of a second target channel parameter estimation result to the pilot frequency subcarrier set;
and determining a second weight according to the sum of the channel qualities and the third weight.
In yet another possible implementation manner, the second weighting module further includes:
a fourth weight module, configured to configure a fourth weight of a second target channel parameter estimation result for the pilot subcarrier set if it is determined that the pilot subcarrier in the pilot subcarrier set is the second pilot subcarrier;
determining a second weight according to the sum of the channel qualities and the fourth weight;
wherein the third weight is greater than the fourth weight.
An embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory, where the processor executes the computer program to implement the steps of the channel parameter estimation method, and as compared with the related art, the method can implement: according to the embodiment of the application, the first pilot frequency subcarrier distributed by the base station based on the communication protocol is received, the second pilot frequency subcarrier except the first pilot frequency subcarrier in all the pilot frequency subcarriers sent by the base station is also obtained, the change of the pilot frequency signal borne by the pilot frequency subcarrier received by the terminal is considered, the change of the pilot frequency subcarrier borne by other terminals is also considered, channel parameter estimation is carried out according to the pilot frequency signals borne by all the pilot frequency subcarriers, the reliability of the signal parameter estimation result is improved, and the error of the pilot frequency signal received by the terminal is reduced.
In an alternative embodiment, an electronic device is provided, as shown in fig. 8, the electronic device 4000 shown in fig. 8 comprising: a processor 4001 and a memory 4003. Processor 4001 is coupled to memory 4003, such as via bus 4002. Optionally, the electronic device 4000 may further include a transceiver 4004, and the transceiver 4004 may be used for data interaction between the electronic device and other electronic devices, such as transmission of data and/or reception of data. In addition, the transceiver 4004 is not limited to one in practical applications, and the structure of the electronic device 4000 is not limited to the embodiment of the present application.
The Processor 4001 may be a CPU (Central Processing Unit), a general-purpose Processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array) or other Programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor 4001 may also be a combination that performs a computational function, including, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, or the like.
The Memory 4003 may be a ROM (Read Only Memory) or other types of static storage devices that can store static information and instructions, a RAM (Random Access Memory) or other types of dynamic storage devices that can store information and instructions, an EEPROM (Electrically Erasable Programmable Read Only Memory), a CD-ROM (Compact Disc Read Only Memory) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), a magnetic Disc storage medium, other magnetic storage devices, or any other medium that can be used to carry or store a computer program and that can be Read by a computer, without limitation.
The memory 4003 is used for storing computer programs for executing the embodiments of the present application, and is controlled by the processor 4001 to execute. The processor 4001 is used to execute computer programs stored in the memory 4003 to implement the steps shown in the foregoing method embodiments.
Embodiments of the present application provide a computer-readable storage medium, on which a computer program is stored, and when being executed by a processor, the computer program may implement the steps and corresponding contents of the foregoing method embodiments.
The terms "first," "second," "third," "fourth," "1," "2," and the like in the description and in the claims of the present application and in the above-described drawings (if any) are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than illustrated or otherwise described herein.
It should be understood that, although each operation step is indicated by an arrow in the flowchart of the embodiment of the present application, the implementation order of the steps is not limited to the order indicated by the arrow. In some implementation scenarios of the embodiments of the present application, the implementation steps in the flowcharts may be performed in other sequences as desired, unless explicitly stated otherwise herein. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on an actual implementation scenario. Some or all of these sub-steps or stages may be performed at the same time, or each of these sub-steps or stages may be performed at different times, respectively. In a scenario where execution times are different, an execution sequence of the sub-steps or the phases may be flexibly configured according to requirements, which is not limited in the embodiment of the present application.
The foregoing is only an optional implementation manner of a part of implementation scenarios in this application, and it should be noted that, for those skilled in the art, other similar implementation means based on the technical idea of this application are also within the protection scope of the embodiments of this application without departing from the technical idea of this application.
Claims (10)
1.A method for estimating channel parameters, the method comprising:
receiving a first pilot frequency subcarrier distributed by a base station based on a communication protocol, and acquiring distribution information of all pilot frequency subcarriers;
acquiring second pilot frequency sub-carriers except the first pilot frequency sub-carriers in all pilot frequency sub-carriers according to the distribution information;
determining pilot signals carried by all pilot subcarriers;
and performing channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result.
2. The channel parameter estimation method according to claim 1, wherein the performing channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result comprises:
determining a first weight corresponding to a pilot signal carried by each pilot subcarrier;
and performing channel parameter estimation on all pilot signals according to the first weights corresponding to all pilot signals to obtain a first target parameter estimation result, and taking the first target parameter estimation result as the channel parameter estimation result.
3. The method according to claim 2, wherein the determining the first weight corresponding to the pilot signal carried by each pilot subcarrier comprises:
for any pilot signal, determining the channel quality of the channel for transmitting the pilot signal;
if the pilot frequency subcarrier carrying the pilot frequency signal is determined to be a first pilot frequency subcarrier, configuring a first weight value for the pilot frequency signal;
and determining the first weight according to the channel quality and the first weight.
4. The method of claim 3, wherein the determining the first weight corresponding to each pilot signal further comprises:
if the pilot frequency subcarrier carrying the pilot frequency signal is determined to be a second pilot frequency subcarrier, configuring a second weight value for the pilot frequency signal;
determining the first weight according to the channel quality and the second weight;
wherein the first weight is greater than the second weight.
5. The channel parameter estimation method according to claim 1, wherein the channel parameter estimation is performed according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result, further comprising:
dividing all pilot frequency sub-carriers into at least one pilot frequency sub-carrier set according to the distribution object of each pilot frequency sub-carrier;
for any pilot frequency subcarrier set, carrying out channel parameter estimation according to pilot frequency signals carried by each pilot frequency subcarrier in the pilot frequency subcarrier set to obtain a second target channel parameter estimation result of the pilot frequency subcarrier set;
and determining a second weight corresponding to the second target channel parameter estimation result of each pilot subcarrier set, and taking the result after weighted average of the second target channel parameter estimation results of each pilot subcarrier set as the channel parameter estimation result according to the second weight.
6. The method of claim 5, wherein the determining the second weight corresponding to each pilot subcarrier set comprises:
for any pilot frequency subcarrier set, determining the sum of the channel quality of the channel for transmitting each pilot frequency subcarrier in the pilot frequency subcarrier set;
if the pilot subcarriers in the pilot subcarrier set are determined to be the first pilot subcarriers, configuring a third weight of a second target channel parameter estimation result to the pilot subcarrier set;
and determining the second weight according to the sum of the channel qualities and the third weight.
7. The channel parameter estimation method according to claim 6, wherein the method further comprises:
if the pilot subcarriers in the pilot subcarrier set are determined to be the second pilot subcarriers, configuring a fourth weight of a second target channel parameter estimation result to the pilot subcarrier set;
determining the second weight according to the sum of the channel qualities and the fourth weight;
wherein the third weight is greater than the fourth weight.
8. An apparatus for estimating channel parameters, the apparatus comprising:
the first acquisition module is used for receiving a first pilot frequency subcarrier distributed by the base station based on a communication protocol and acquiring the distribution information of all the pilot frequency subcarriers;
a second obtaining module, configured to obtain, according to the allocation information, second pilot subcarriers, except for the first pilot subcarrier, of all pilot subcarriers;
a determining module, configured to determine pilot signals carried by all pilot subcarriers;
and the estimation module is used for estimating channel parameters according to the pilot signals carried by all the pilot subcarriers to obtain a channel parameter estimation result.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory, characterized in that the processor executes the computer program to implement the steps of the channel parameter estimation method according to any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the channel parameter estimation method according to any one of claims 1 to 7.
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