CN114337868B - Channel parameter estimation method, device, electronic equipment and readable storage medium - Google Patents
Channel parameter estimation method, device, electronic equipment and readable storage medium Download PDFInfo
- Publication number
- CN114337868B CN114337868B CN202111629666.XA CN202111629666A CN114337868B CN 114337868 B CN114337868 B CN 114337868B CN 202111629666 A CN202111629666 A CN 202111629666A CN 114337868 B CN114337868 B CN 114337868B
- Authority
- CN
- China
- Prior art keywords
- pilot
- parameter estimation
- subcarrier
- weight
- channel parameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000004891 communication Methods 0.000 claims abstract description 23
- 238000004590 computer program Methods 0.000 claims description 11
- 239000000969 carrier Substances 0.000 abstract description 19
- 230000008859 change Effects 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000012549 training Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000003190 augmentative effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The embodiment of the application provides a channel parameter estimation method, a device, electronic equipment and a readable storage medium, and relates to the technical field of wireless communication. The method comprises the following steps: the method comprises the steps that a first pilot frequency subcarrier allocated by a base station based on a communication protocol is received by the related content receiving base station with independent rights, and allocation information of all pilot frequency subcarriers is obtained; acquiring second pilot frequency sub-carriers except the first pilot frequency sub-carriers in all pilot frequency sub-carriers according to the allocation information; determining pilot signals carried by all pilot subcarriers; and carrying out 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 carried by the pilot subcarrier received by the terminal, but also considers the change of the pilot subcarrier carried by other terminals, improves the reliability of the signal parameter estimation result, and reduces the error of the pilot signal received by the terminal.
Description
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to a channel parameter estimation method, a device, an electronic apparatus, and a readable storage medium.
Background
In the field of wireless communication, wi-Fi 6 (sixth generation wireless network communication technology) has been developed, where Wi-Fi 6 mainly uses OFDMA (Orthogonal Frequency Division Multiple Access ) and MU-MIMO (Multiple-User Multiple-Input Multiple-Output) technologies, where OFDMA (Orthogonal Frequency Division Multiple Access ) can allocate different subcarrier resources to Multiple clients at the same time, and MU-MIMO (Multiple-User Multiple-Input Multiple-Output) technologies allow a router to communicate with Multiple devices at the same time, instead of sequentially.
When the OFDMA technology is used under Wi-Fi 6 in the prior art, unlike the traditional single-user mode, the MU-MIMO technology can simultaneously send subcarrier resources to a plurality of user terminals, so that the flexibility of subcarrier resource allocation and the number of the user terminals are improved.
However, for one of the ue, the available sub-carriers for the ue is reduced, for example, 8 pilot sub-carriers are available for the ue in the single-ue mode, and only 2 pilot sub-carriers are available for the ue in the OFDMA mode, which can meet the resource requirement of the ue, but when channel parameter estimation is performed, channel parameter estimation is performed based on 2 pilot sub-carriers in the prior art, and reliability of the estimated parameters is lower, resulting in larger data error received by the ue.
Disclosure of Invention
The embodiment of the application provides a method, a device, electronic equipment and a readable storage medium for estimating channel parameters, which can solve the problems. The technical scheme is as follows:
The method comprises the steps that a first pilot frequency subcarrier allocated by a base station based on a communication protocol is received, and allocation information of all pilot frequency subcarriers is obtained;
acquiring second pilot frequency sub-carriers except the first pilot frequency sub-carriers in all pilot frequency sub-carriers according to the allocation information;
Determining pilot signals carried by all pilot subcarriers;
and carrying out channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result.
In one possible implementation manner, channel parameter estimation is performed according to pilot signals carried by all pilot subcarriers, so as to obtain a channel parameter estimation result, including:
Determining a first weight corresponding to pilot signals carried by each pilot subcarrier;
and carrying out 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 the first weight corresponding to the pilot signal carried by each pilot subcarrier includes:
for any one pilot signal, determining the channel quality of a channel for transmitting the pilot signal;
if the pilot frequency subcarrier bearing the pilot frequency signal is determined to be a first pilot frequency subcarrier, the first weight of the pilot frequency signal is configured;
and determining a first weight according to the channel quality and the first weight.
In yet another possible implementation manner, determining the first weight corresponding to each pilot signal further includes:
if the pilot frequency subcarrier bearing the pilot frequency signal is determined to be a second pilot frequency subcarrier, the second weight is configured 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 another possible implementation manner, the channel parameter estimation is performed according to pilot signals carried by all pilot subcarriers, so as to obtain a channel parameter estimation result, and the method further includes:
Dividing all pilot subcarriers into at least one pilot subcarrier set according to the allocation object of each pilot subcarrier;
For any one pilot subcarrier set, carrying out channel parameter estimation 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;
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 result of each pilot subcarrier set as a channel parameter estimation result according to the second weight.
In yet another possible implementation, determining the second weights corresponding to the respective pilot subcarrier sets includes:
For any one pilot subcarrier set, determining the sum of channel quality of channels for transmitting each pilot subcarrier in the pilot subcarrier set;
if the pilot subcarriers in the pilot subcarrier set are determined to be the first pilot subcarriers, configuring a third weight value for a second target channel parameter estimation result of the pilot subcarrier set;
and determining a second weight according to the sum of the channel quality and the third weight.
In yet another possible implementation, the method further includes:
If the pilot subcarriers in the pilot subcarrier set are determined to be the second pilot subcarriers, the fourth weight of the second target channel parameter estimation result is configured to the pilot subcarrier set;
determining a second weight according to the sum of the channel quality and the fourth weight;
Wherein the third weight is greater than the fourth weight.
According to another aspect of an embodiment of the present application, there is provided a channel parameter estimation apparatus, including:
The first acquisition module is used for receiving first pilot frequency subcarriers distributed by the base station based on a communication protocol and acquiring distribution information of all the pilot frequency subcarriers;
the second acquisition module is used for acquiring second pilot frequency subcarriers except the first pilot frequency subcarriers in all pilot frequency subcarriers according to the allocation information;
A determining module, configured to determine pilot signals carried by all pilot subcarriers;
and the estimation module is used for carrying out channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result.
According to another aspect of an embodiment of the present application, there is provided an electronic device including a memory, a processor, and a computer program stored on the memory, the processor executing the computer program to implement the steps of the channel parameter estimation method described above.
According to a further aspect of the embodiments of the present application, there is provided a computer readable storage medium, which 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 beneficial effects that:
According to the embodiment of the application, the first pilot frequency sub-carrier wave distributed by the base station based on the communication protocol is received, and the second pilot frequency sub-carrier waves except the first pilot frequency sub-carrier wave in all the pilot frequency sub-carrier waves transmitted by the base station are obtained, so that not only the change of the pilot frequency signal carried by the pilot frequency sub-carrier wave received by the terminal is considered, but also the change of the pilot frequency sub-carrier wave carried by other terminals is considered, the channel parameter estimation is carried out according to the pilot frequency signals carried by all the pilot frequency sub-carrier waves, 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 that are required to be 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 application;
fig. 2 is a flow chart of a channel parameter estimation method according to an embodiment of the present application;
Fig. 3 is a schematic diagram of pilot subcarrier distribution with 20M bandwidth according to an embodiment of the present application;
fig. 4 is a schematic 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 application;
Fig. 6 is a schematic flow chart of another channel parameter estimation according to an embodiment of the present application;
Fig. 7 is a schematic structural diagram of a channel parameter estimation device 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 with reference to the drawings in the present application. It should be understood that the embodiments described below with reference to the drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application, and the technical solutions of the embodiments of the present application are not limited.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and "comprising," when used in this specification, 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, all of which may be included in the present specification. 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 that 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".
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
First, several terms related to the present application are described and explained:
Wi-Fi6, original name: 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 in the IEEE 802.11 standard by the Wi-Fi alliance, and Wi-Fi6 can allow communication with up to 8 devices at the same time, and the highest rate can reach 9.6Gbps.
OFDMA (Orthogonal Frequency Division Multiple Access ), which is a multiple access technique by which users share frequency band resources to access a system.
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 smart phone with a WiFi module. The STA may be mobile or fixed, and is the most basic component of a wireless local area network.
An AP (Access Point) mainly provides Access to a wired lan by a wireless station and Access to the wireless station from the wired lan, through which wireless stations in the coverage area of the Access Point can communicate with each other, such as a router.
RU (Resource unit), which introduces OFDMA technology in Wi-Fi6, needs to redefine the concept of time-frequency Resource blocks, which quickly intersect each other, and divide the resources of the entire channel into small, fixed-size time-frequency Resource blocks as pilot subcarrier resources, i.e., RU. There are a variety of different sized RUs in Wi-Fi6, such as 26-subcarrier RU, 52-subcarrier RU, 106-subcarrier RU, etc., including 26, 52, 106 pilot subcarriers, respectively.
When the OFDMA technology is used under Wi-Fi 6 in the prior art, unlike the traditional single-user mode, the MU-MIMO technology can simultaneously send subcarrier resources to a plurality of user terminals, so that the flexibility of subcarrier resource allocation and the number of the user terminals are improved.
However, for one of the ue, the available sub-carriers for the ue is reduced, for example, 8 pilot sub-carriers are available for the ue in the single-ue mode, and only 2 pilot sub-carriers are available for the ue in the OFDMA mode, which can meet the resource requirement of the ue, but when channel parameter estimation is performed, channel parameter estimation is performed based on 2 pilot sub-carriers in the prior art, and reliability of the estimated parameters is lower, resulting in larger data error received by the ue.
The application provides a channel parameter estimation method, a device, electronic equipment and a readable storage medium, and aims to solve the technical problems in the prior art.
The technical solutions of the embodiments of the present application and technical effects produced by the technical solutions of the present application are described below by describing several exemplary embodiments. It should be noted that the following embodiments may be referred to, or combined with each other, and the description will not be repeated for the same terms, similar features, similar implementation steps, and the like in different embodiments.
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, 30 represent terminals, 40 represent base stations, and it should be understood that the numbers of terminals and base stations in fig. 1 are merely schematic. According to practical requirements, the wireless network interaction system can have any number of terminals and base stations, and users can use the terminals 10, 20 and 30 to interact with the base station 40 in a wireless network to complete estimation of channel parameters.
A terminal, in this embodiment of the present application, a terminal device is a device with a wireless transceiver function, and may be referred to as a terminal (terminal), a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), an access terminal device, a vehicle-mounted terminal device, an industrial control terminal device, a UE unit, a UE station, a mobile station, a remote terminal device, a mobile device, a UE terminal device, 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 body, a vehicle-mounted terminal, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (SELF DRIVING), a wireless terminal in teleoperation (remote medical surgery), a wireless terminal in smart grid (SMART GRID), a wireless terminal in transportation security (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, SIP) phone, a wireless local loop (wirelesslocal loop, WLL) station, a personal digital assistant (personal 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 future mobile communication network, or a public land mobile network (public land mobile network) may not be limiting examples of the application.
The embodiment of the application provides a channel parameter estimation method, as shown in fig. 2, which comprises the following steps:
s101, receiving a first pilot frequency subcarrier allocated by a base station based on a communication protocol, and acquiring allocation information of all pilot frequency subcarriers.
It should be understood that, the base station may send pilot subcarriers to each terminal based on a preset communication protocol, where the communication protocol specifies available pilot subcarriers for each terminal in the current communication network system, that is, allocation information of the pilot subcarriers, where the allocation information records a correspondence between each terminal and the available pilot subcarriers for the terminal, the base station sends the pilot subcarriers through a system bandwidth, and each terminal receives the corresponding pilot subcarriers according to the communication protocol and analyzes corresponding data for use.
In the embodiment of the application, for a terminal, after receiving a first pilot subcarrier allocated by a base station based on a communication protocol, the terminal also acquires allocation information of all pilot subcarriers from the base station.
S102, acquiring second pilot frequency sub-carriers except the first pilot frequency sub-carriers in all pilot frequency sub-carriers according to the allocation information;
After the terminal obtains the allocation information, since all pilot subcarriers are recorded in the allocation information, the terminal can obtain second pilot subcarriers except the first pilot subcarriers in all pilot subcarriers, and it should be understood that the second pilot subcarriers are all transmitted by the system bandwidth although allocated to other terminals by the base station, in general, each terminal only needs to analyze pilot signals in pilot subcarriers specified by the protocol from the system bandwidth, and in the embodiment of the present application, the terminal can also obtain the second pilot subcarriers of other terminals.
S103, determining pilot signals carried by all pilot subcarriers;
One pilot subcarrier corresponds to one sub-channel, the pilot subcarrier transmits a data signal in the form of a wave, the pilot signal refers to the data signal carried in the pilot subcarrier, and after all the pilot subcarriers are acquired by a terminal, the terminal can demodulate the pilot signal carried by the pilot subcarrier.
Taking a pilot subcarrier with 20M bandwidth as an example in the embodiment of the present application, fig. 3 is a schematic diagram of a pilot subcarrier distribution with 20M bandwidth provided in the embodiment of the present application, as shown in fig. 3, each trapezoid represents a pilot subcarrier resource RU of a user terminal, including RU26, RU52, RU106 and RU242, and the trapezoid labeled 1 is a Guard Sub-carrier (Guard Sub-carriers) for protection between channels; 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; the 7DC and 3DC null direct current subcarriers (DC subcarriers) are used as guard bandwidths, 7 in RU26, RU52, RU106, and 3 in RU 242.
S104, carrying out channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result.
It should be appreciated that in a communication system, a signal is transmitted from a transmitting end, and is transmitted through a channel to a receiving section, the signal is affected by the transmission channel, distortion occurs or various noise is added to the signal, etc., resulting in a change in amplitude and phase of the signal, and channel parameter estimation is a process of estimating such characteristics of the channel based on the received signal.
In the embodiment of the application, after the pilot signal is transmitted to the terminal through the pilot sub-carrier, the phase rotation is caused by the time offset and the frequency offset, so that the pilot signal is changed, and the channel parameter estimation can be performed according to the pilot signals carried by all the pilot sub-carriers acquired by the terminal, thereby obtaining the channel parameter estimation result.
According to the embodiment of the application, the first pilot frequency sub-carrier wave distributed by the base station based on the communication protocol is received, and the second pilot frequency sub-carrier waves except the first pilot frequency sub-carrier wave in all the pilot frequency sub-carrier waves transmitted by the base station are obtained, so that not only the change of the pilot frequency signal carried by the pilot frequency sub-carrier wave received by the terminal is considered, but also the change of the pilot frequency sub-carrier wave carried by other terminals is considered, the channel parameter estimation is carried out according to the pilot frequency signals carried by all the pilot frequency sub-carrier waves, 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 application provides a possible implementation manner, which carries out channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result, and comprises the following steps:
Determining a first weight corresponding to pilot signals carried by each pilot subcarrier;
and carrying out 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 because the pilot subcarriers are different, the changes that occur in the pilot signals carried by each pilot subcarrier, that is, the phase rotations, are also different, so in the embodiment of the present application, a manner is provided to perform channel parameter estimation, that is, different weights are set for the pilot signals carried by different pilot subcarriers, as a first weight, and specific weight allocation is described in the following embodiments.
After determining the first weights of pilot signals carried by each pilot subcarrier, channel parameter estimation can be performed on all pilot signals by combining the first weights corresponding to all pilot signals to obtain a first target channel parameter estimation result, and a specific algorithm for performing channel parameter estimation can be a WLS (WEIGHTED LEAST square method) algorithm to obtain a unique channel parameter estimation result, or other weighting algorithms can be adopted.
According to the embodiment of the application, the first weights corresponding to the pilot signals carried by the subcarriers of each frequency are determined, and the channel parameter estimation is carried out 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 the channel parameter estimation is improved.
The embodiment of the application provides a possible implementation manner, which determines a first weight corresponding to a pilot signal carried by each pilot subcarrier, and comprises the following steps:
for any one pilot signal, determining the channel quality of a channel for transmitting the pilot signal;
if the pilot frequency subcarrier bearing the pilot frequency signal is determined to be a first pilot frequency subcarrier, the first weight of the pilot frequency signal is configured;
and determining a 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 extent to which the channel affects the transmitted signal, so that the channel quality of the channel transmitting the pilot signal needs to be taken into account when determining the first weight of any one pilot signal.
On the other hand, since the pilot subcarrier received by the terminal is the first pilot subcarrier, the pilot subcarriers received by other terminals are the second pilot subcarrier, and the second pilot subcarrier received by other terminals cannot be directly related to the channel parameter estimation of the first pilot subcarrier received by the terminal, but the parameters such as time offset, frequency offset, and public phase difference of the first pilot subcarrier received by the terminal can be estimated by using the phase rotation of the second pilot subcarrier due to the time offset and the frequency offset.
In the 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 set in advance for the pilot signal is configured, it should be understood that the first weight may be set in advance according to the actual situation, and a first weight is set for the pilot signal carried by each first pilot subcarrier, and after determining the channel quality and the first weight, the weight corresponding to the pilot signal may be determined according to the channel quality and the first weight.
The embodiment of the application provides a possible implementation manner, which determines the first weight corresponding to each pilot signal, and further comprises:
if the pilot frequency subcarrier bearing the pilot frequency signal is determined to be a second pilot frequency subcarrier, the second weight is configured 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 the 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 subcarrier received by the other terminals except the terminal, the second weight of the pilot signal may be configured, and similarly, the second weight may be preset according to the actual situation, and it should be noted that the first weight in the above embodiment is greater than the second weight, so that the first pilot subcarrier received by the terminal may perform the smoothing noise reduction processing, and has higher reliability.
Then, according to the channel quality that can be determined according to the above embodiment, in combination with the second weight, the weight corresponding to the pilot signal carried by the second pilot subcarrier of the data is determined, and detailed description of the embodiment of the present application is omitted.
Specifically, the embodiment of the application also provides a formula for specifically calculating the first weight corresponding to the pilot signal, as shown in the following formula (1):
wk＝|hk|·αk (1)
Wherein, |h k | is the channel quality of the channel transmitting pilot signal k; alpha k is a first weight or a second weight corresponding to the pilot signal k; w k is the first weight corresponding to pilot signal k.
The embodiment of the application provides a possible implementation manner, which carries out channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result, and further comprises:
Dividing all pilot subcarriers into at least one pilot subcarrier set according to the allocation object of each pilot subcarrier;
For any one pilot subcarrier set, carrying out channel parameter estimation 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;
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 result of each pilot subcarrier set as a channel parameter estimation result according to the second weight.
The embodiment of the application also provides another way for estimating the channel parameters of all pilot subcarriers, and based on each terminal, the pilot subcarriers received by each terminal are used as a pilot subcarrier set, namely all the pilot subcarriers are divided into at least one pilot subcarrier set according to the distribution object of each pilot subcarrier, and the pilot subcarriers in each pilot subcarrier set belong to the same terminal for receiving.
For any one pilot subcarrier set, channel parameter estimation can 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 the embodiment of the application, channel parameter estimation is performed on the pilot subcarrier set received by each terminal first to obtain a second target channel parameter result of each terminal.
In the embodiment of the application, corresponding second weights are configured for the second target channel parameter results of each pilot subcarrier set, the second target channel parameter estimation results of each pilot subcarrier are weighted-averaged, the weighted-averaged results are used as final channel parameter estimation results, and obviously, compared with the results obtained by carrying out channel parameter estimation only according to pilot signals carried by pilot subcarriers received by the terminal, the method and the device have the advantages that the results obtained by carrying out channel parameter estimation only according to pilot signals carried by the pilot subcarriers received by the terminal are more accurate, and the error is reduced.
The embodiment of the application provides a possible implementation manner, which comprises the steps of:
For any one pilot subcarrier set, determining the sum of channel quality of channels for transmitting each pilot subcarrier in the pilot subcarrier set;
if the pilot subcarriers in the pilot subcarrier set are determined to be the first pilot subcarriers, configuring a third weight value for a second target channel parameter estimation result of the pilot subcarrier set;
and determining a second weight according to the sum of the channel quality and the third weight.
It should be appreciated that for a set of pilot subcarriers, the channel quality corresponding to the set of pilot subcarriers may be the sum of the channel qualities of the channels in the set of pilot subcarriers over which each pilot subcarrier is transmitted, with the sum of the channel qualities of the channels of each pilot subcarrier being taken as the channel quality of the set of pilot subcarriers.
In the embodiment of the application, if it is determined that the pilot subcarrier in the pilot subcarrier set is the first pilot subcarrier, that is, the pilot subcarrier set is the pilot subcarrier acquired by the terminal, a third weight is configured for the second target channel estimation result of the pilot subcarrier set, and then a second weight is determined according to the channel quality and the third weight corresponding to the pilot subcarrier set, and the product of the channel quality and the third weight can 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 subcarriers in the pilot subcarrier set are determined to be the second pilot subcarriers, the fourth weight of the second target channel parameter estimation result is configured to the pilot subcarrier set;
determining a second weight according to the sum of the channel quality and the fourth weight;
Wherein the third weight is greater than the fourth weight.
Similarly, in the 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 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 application also provides a calculation process for specifically calculating the second weight corresponding to the pilot subcarrier set, as shown in the following formula (2):
wi＝αi·∑|hk|k∈Ki (2)
Where w i represents the second weight of pilot subcarrier set i; alpha i represents a third weight or a fourth weight corresponding to the pilot subcarrier set i; the |h k | represents the signal quality corresponding to the pilot subcarrier k in the pilot subcarrier set i; k i denotes all pilot subcarriers in pilot subcarrier set i; sigma|h k | represents the sum of the signal qualities corresponding to pilot subcarrier k in pilot subcarrier set i.
The embodiment of the application provides a possible implementation manner, and further comprises the steps of carrying out channel equalization and phase compensation on pilot signals carried by pilot subcarriers before carrying out channel parameter estimation.
When channel parameter estimation is performed, channel equalization may be performed according to 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, the training sequence which is received by the receiving terminal and changes after channel transmission is used as a target training sequence, the target training sequence is compared with the known training sequence, the influence on the pilot signal when the pilot signal is transmitted to the channel is determined and recorded as channel information, and specifically, the calculation process for determining the channel information is shown in the following formula (3):
hk＝rHELTF,k/preamblek (3)
Wherein h k denotes channel information; r HELTF,k denotes the target training sequence in pilot subcarrier k; preamble k represents a known training sequence.
The specific calculation process for performing channel equalization is shown in the following formula (4):
Wherein, Pilot signals carried by pilot subcarriers k after channel equalization; r pilot,k is the pilot signal carried by pilot subcarrier k; h k denotes channel information.
It should be understood that the pilot signal after the channel equalization needs to be subjected to phase compensation, and the influence of the symbol of the pilot signal on the pilot signal is taken out, specifically, the process of performing phase compensation is shown in the following formula (5):
Wherein, Pilot signals carried by the pilot sub-carrier k after phase compensation; /(I)Pilot signals carried by the pilot subcarrier k after robust and sturdy channels of equalization; pilot k is the symbol of the pilot signal carried by pilot subcarrier k.
In the embodiment of the present application, taking a pilot subcarrier with a bandwidth of 20M 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 a pilot subcarrier resource, including symbols of three pilot subcarrier resources RU26, RU52 and RU106, each column represents a pilot subcarrier, and is identified by an index number, including symbols of-116, -102, -90, -76, -62, -45, -36, -22, -10, 22, 36, 45, 62, 76, 90, 102 and 116, where 1, -1 represents the symbol of the pilot signal carried by each pilot subcarrier.
The embodiment of the application also provides an implementation mode, which comprises a full process of channel parameter estimation in the embodiment of the application.
Specifically, fig. 5 is a schematic flow chart of channel parameter estimation provided by the embodiment of the present application, which is a flow chart of channel parameter estimation for pilot signals carried by each pilot subcarrier, as shown in fig. 5, from beginning to end of the flow chart, including determining channel information; carrying out channel equalization; determining the sign of the pilot signal; performing phase compensation; the specific content of performing channel parameter estimation has been described in the above embodiments, and the embodiments of the present application are not described in detail.
Fig. 6 is a schematic flow chart of another channel parameter estimation provided in the embodiment of the present application, which is a flow chart of channel parameter estimation for pilot signals carried by pilot subcarriers in each pilot subcarrier set, as shown in fig. 6, from beginning to end of the flow chart, including determining channel information; carrying out channel equalization; determining the sign of the pilot signal; performing phase compensation; estimating channel parameters; the weighted average is described in the above embodiments, and the embodiments of the present application are not described in detail.
An embodiment of the present application provides a channel parameter estimation apparatus, as shown in fig. 7, where the channel parameter estimation apparatus may include: the first acquisition module 110, the second acquisition module 210, the determination module 310, and the 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 second pilot subcarriers except the first pilot subcarriers in all pilot subcarriers according to the allocation information;
A determining module 310, configured to determine pilot signals carried by all pilot subcarriers;
the estimation module 410 is configured to perform channel parameter estimation according to pilot signals carried by all pilot subcarriers, and 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 the pilot signal carried by each pilot subcarrier;
The first estimation module is used for carrying out 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 weight 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 bearing the pilot frequency signal is determined to be a first pilot frequency subcarrier, the first weight of the pilot frequency signal is configured;
and determining a first weight according to the channel quality and the first weight.
In yet another possible implementation, the first weight module further includes:
the second weight module is used for configuring a second weight for the pilot signal if the pilot subcarrier bearing 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 subcarriers into at least one pilot frequency subcarrier set according to the allocation object of each pilot frequency subcarrier;
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;
The second weight module is configured to determine a second weight corresponding to a second target channel parameter estimation result of each pilot subcarrier set, and according to the second weight, take a result after weighted averaging of the second target channel parameter estimation result of each pilot subcarrier set as a channel parameter estimation result.
In yet another possible implementation, the second weight module includes:
A third weight module, configured to determine, for any one pilot subcarrier set, a sum of channel qualities of channels of pilot subcarriers in the pilot subcarrier set;
if the pilot subcarriers in the pilot subcarrier set are determined to be the first pilot subcarriers, configuring a third weight value for a second target channel parameter estimation result of the pilot subcarrier set;
and determining a second weight according to the sum of the channel quality and the third weight.
In yet another possible implementation, the second weight module further includes:
A fourth weight module, configured to configure a fourth weight to a second target channel parameter estimation result of 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 quality and the fourth weight;
Wherein the third weight is greater than the fourth weight.
The embodiment of the application provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory, wherein the processor executes the computer program to realize the steps of a channel parameter estimation method, and compared with the related technology, the method can realize the steps of the channel parameter estimation method: according to the embodiment of the application, the first pilot frequency sub-carrier wave distributed by the base station based on the communication protocol is received, and the second pilot frequency sub-carrier waves except the first pilot frequency sub-carrier wave in all the pilot frequency sub-carrier waves transmitted by the base station are obtained, so that not only the change of the pilot frequency signal carried by the pilot frequency sub-carrier wave received by the terminal is considered, but also the change of the pilot frequency sub-carrier wave carried by other terminals is considered, the channel parameter estimation is carried out according to the pilot frequency signals carried by all the pilot frequency sub-carrier waves, 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, there is provided an electronic device, as shown in fig. 8, the electronic device 4000 shown in fig. 8 includes: a processor 4001 and a memory 4003. Wherein the processor 4001 is coupled to the memory 4003, such as via a bus 4002. Optionally, the electronic device 4000 may further comprise a transceiver 4004, 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, etc. It should be noted that, in practical applications, the transceiver 4004 is not limited to one, 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 ), general purpose Processor, DSP (DIGITAL SIGNAL Processor, data signal Processor), ASIC (Application SPECIFIC INTEGRATED Circuit), FPGA (Field Programmable GATE ARRAY ) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with this disclosure. The processor 4001 may also be a combination that implements computing functionality, e.g., comprising one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.
Bus 4002 may include a path to transfer information between the aforementioned components. Bus 4002 may be a PCI (PERIPHERAL COMPONENT INTERCONNECT, peripheral component interconnect standard) bus or an EISA (Extended Industry Standard Architecture ) bus, or the like. The bus 4002 can be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 8, but not only one bus or one type of bus.
Memory 4003 may be, but is not limited to, ROM (Read Only Memory) or other type of static storage device that can store static information and instructions, RAM (Random Access Memory ) or other type of dynamic storage device that can store information and instructions, EEPROM (ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY ), CD-ROM (Compact Disc Read Only Memory, compact disc Read Only Memory) or other optical disk storage, optical disk storage (including compact discs, laser discs, optical discs, digital versatile discs, blu-ray discs, etc.), magnetic disk storage media, 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.
The memory 4003 is used for storing a computer program for executing an embodiment of the present application, and is controlled to be executed by the processor 4001. The processor 4001 is configured to execute a computer program stored in the memory 4003 to realize the steps shown in the foregoing method embodiment.
Embodiments of the present application provide a computer readable storage medium having a computer program stored thereon, which when executed by a processor, implements the steps of the foregoing method embodiments and corresponding content.
The terms "first," "second," "third," "fourth," "1," "2," and the like in the description and in the claims and in the above figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate, such that the embodiments of the application described herein may be implemented in other sequences than those illustrated or otherwise described.
It should be understood that, although various operation steps are indicated by arrows in the flowcharts of the embodiments of the present application, the order in which these steps are implemented is not limited to the order indicated by the arrows. In some implementations of embodiments of the application, the implementation steps in the flowcharts may be performed in other orders as desired, unless explicitly stated herein. Furthermore, some or all of the steps in the flowcharts may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or phases may be performed at the same time, or each of these sub-steps or phases may be performed at different times, respectively. In the case of different execution time, the execution sequence of the sub-steps or stages can be flexibly configured according to the requirement, which is not limited by the embodiment of the present application.
The foregoing is merely an optional implementation manner of some of the implementation scenarios of the present application, and it should be noted that, for those skilled in the art, other similar implementation manners based on the technical ideas of the present application are adopted without departing from the technical ideas of the scheme of the present application, and the implementation manner is also within the protection scope of the embodiments of the present application.
Claims (10)
1. A method of channel parameter estimation, the method comprising:
the method comprises the steps of receiving a first pilot frequency subcarrier allocated by a base station based on a communication protocol, analyzing a pilot frequency signal of the first pilot frequency subcarrier, and acquiring allocation information of all pilot frequency subcarriers from the base station;
according to the allocation information, analyzing pilot signals of second pilot subcarriers except the first pilot subcarriers in all pilot subcarriers from the system bandwidth to obtain pilot signals carried by all pilot subcarriers;
and carrying out channel parameter estimation according to pilot signals carried by all pilot subcarriers to obtain a channel parameter estimation result.
2. The method for estimating channel parameters according to claim 1, wherein said estimating channel parameters according to pilot signals carried by all pilot subcarriers to obtain channel parameter estimation results comprises:
Determining a first weight corresponding to pilot signals carried by each pilot subcarrier;
And carrying out 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 of channel parameter estimation according to claim 2, wherein determining the first weight corresponding to the pilot signal carried by each pilot subcarrier comprises:
For any one pilot signal, determining the channel quality of a channel for transmitting the pilot signal;
if the pilot frequency subcarrier bearing the pilot frequency signal is determined to be a first pilot frequency subcarrier, the first weight of the pilot frequency signal is configured;
And determining the first weight according to the channel quality and the first weight.
4. The method for estimating channel parameters according to claim 3, wherein said determining the first weights corresponding to the respective pilot signals further comprises:
if the pilot frequency subcarrier bearing the pilot frequency signal is determined to be a second pilot frequency subcarrier, configuring the second weight value of 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 method for estimating channel parameters according to claim 1, wherein said estimating channel parameters according to pilot signals carried by all pilot subcarriers to obtain channel parameter estimation results, further comprises:
Dividing all pilot subcarriers into at least one pilot subcarrier set according to the allocation object of each pilot subcarrier;
For any one pilot subcarrier set, carrying out channel parameter estimation according to pilot signals carried by each pilot subcarrier in the pilot subcarrier set, and obtaining a second target channel parameter estimation result of the pilot subcarrier set;
and determining a second weight corresponding to a second target channel parameter estimation result of each pilot subcarrier set, and taking a result after weighted average of the second target channel parameter estimation result of each pilot subcarrier set as the channel parameter estimation result according to the second weight.
6. The method of channel parameter estimation according to claim 5, wherein said determining the second weights corresponding to the respective pilot subcarrier sets comprises:
for any one pilot subcarrier set, determining the sum of channel quality of channels transmitting all pilot subcarriers in the pilot 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 value of a second target channel parameter estimation result of the pilot frequency subcarrier set;
And determining the second weight according to the sum of the channel quality and the third weight.
7. The channel parameter estimation method of claim 6, wherein the method further comprises:
If the pilot frequency subcarrier in the pilot frequency subcarrier set is determined to be the second pilot frequency subcarrier, configuring a fourth weight value of a second target channel parameter estimation result of the pilot frequency subcarrier set;
determining the second weight according to the sum of the channel quality and the fourth weight;
Wherein the third weight is greater than the fourth weight.
8. A channel parameter estimation apparatus, the apparatus comprising:
The first acquisition module is used for receiving a first pilot frequency subcarrier allocated by the base station based on a communication protocol, analyzing a pilot frequency signal of the first pilot frequency subcarrier, and acquiring allocation information of all pilot frequency subcarriers from the base station;
The second acquisition module is used for analyzing second pilot subcarriers except the first pilot subcarriers in all pilot subcarriers from the system bandwidth according to the allocation information so as to acquire pilot signals borne by all pilot subcarriers;
and the estimation module is used for carrying out channel parameter estimation according to pilot signals carried by all 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 carry out the steps of the channel parameter estimation method of any one of claims 1-7.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the channel parameter estimation method of any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111629666.XA CN114337868B (en) | 2021-12-28 | 2021-12-28 | Channel parameter estimation method, device, electronic equipment and readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111629666.XA CN114337868B (en) | 2021-12-28 | 2021-12-28 | Channel parameter estimation method, device, electronic equipment and readable storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114337868A CN114337868A (en) | 2022-04-12 |
| CN114337868B true CN114337868B (en) | 2024-06-18 |
Family
ID=81015745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111629666.XA Active CN114337868B (en) | 2021-12-28 | 2021-12-28 | Channel parameter estimation method, device, electronic equipment and readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114337868B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6928062B2 (en) * | 2002-10-29 | 2005-08-09 | Qualcomm, Incorporated | Uplink pilot and signaling transmission in wireless communication systems |
| CN101729456B (en) * | 2009-12-14 | 2012-11-28 | 上海交通大学 | Channel estimation method of orthogonal frequency division multiplexing (OFDM) communication system |
| AU2011295635B2 (en) * | 2010-09-01 | 2016-08-18 | Commonwealth Scientific And Industrial Research Organisation | Channel estimation in a multi-user MIMO-OFDM system in the presence of user terminal symbol-specific phase offsets |
| CN103379073B (en) * | 2012-04-23 | 2016-03-09 | 普天信息技术研究院有限公司 | uplink noise estimation method |
| US20180013592A1 (en) * | 2015-01-20 | 2018-01-11 | ZTE Canada Inc. | Channel estimation using composite subcarriers and combined pilots |
| US10516449B2 (en) * | 2015-07-14 | 2019-12-24 | Commonwealth Scientific And Industrial Research Organisation | Multi-user MIMO-OFDM system |
| CN105634706B (en) * | 2015-12-25 | 2018-12-28 | 重庆邮电大学 | Pilot frequency pattern design and detection method in a kind of CoMP system |
| CN107026720A (en) * | 2016-01-29 | 2017-08-08 | 华为技术有限公司 | A kind of pilot signal transmission, channel estimation methods and equipment |
-
2021
- 2021-12-28 CN CN202111629666.XA patent/CN114337868B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114337868A (en) | 2022-04-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11139906B2 (en) | Wireless communication method and wireless communications apparatus | |
| EP2689551B1 (en) | Method and apparatus for Subchannel Power Imbalance Ratio, SCPIR, estimation in VAMOS communication sytems. | |
| EP2790338B1 (en) | Wireless device and training signal transmission method | |
| EP3531645B1 (en) | Reference signal configuration method, training field configuration method, and apparatus | |
| CN111245750B (en) | Frequency offset estimation method, device and storage medium | |
| CN112236984A (en) | Electronic device and communication method | |
| CN107690180B (en) | Power allocation method and base station using the same | |
| WO2022068936A1 (en) | Method and apparatus for mapping reference signals | |
| EP3849128A1 (en) | Interleaving of combinations of multiple resource units in wlan | |
| US20190074947A1 (en) | Reference signal transmission method and apparatus | |
| CN114337868B (en) | Channel parameter estimation method, device, electronic equipment and readable storage medium | |
| CN112887068B (en) | Data transmission method, transmitting device and receiving device | |
| CN112153690B (en) | Communication method and communication device | |
| CN112235087A (en) | Demodulation reference signal configuration method, terminal and network side equipment | |
| CN111865847B (en) | Data transmission method and device | |
| CN117121414A (en) | Method and apparatus for transmitting reference signal | |
| US20240113836A1 (en) | Signal transmission method and apparatus | |
| CN115225436B (en) | Interference suppression method, device, equipment and storage medium | |
| CN115801505B (en) | Channel estimation method, device, communication equipment and storage medium | |
| CN114884634B (en) | Communication method, device and equipment | |
| US20230327915A1 (en) | Channel estimation method and apparatus, communication device, and storage medium | |
| US11102792B2 (en) | Method and apparatus for demodulating signal by using subframe combination in wireless communication system | |
| CN114884634A (en) | Communication method, device and equipment | |
| CN117997694A (en) | Phase noise processing method and device and terminal equipment | |
| CN116781468A (en) | Communication method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 100176 Room 101, 1f, building 3, yard 18, Kechuang 10th Street, Beijing Economic and Technological Development Zone, Beijing Applicant after: Beijing ESWIN Computing Technology Co.,Ltd. Applicant after: GUANGZHOU QUANSHENGWEI INFORMATION TECHNOLOGY Co.,Ltd. Address before: 100176 Room 101, 1f, building 3, yard 18, Kechuang 10th Street, Beijing Economic and Technological Development Zone, Beijing Applicant before: Beijing yisiwei Computing Technology Co.,Ltd. Applicant before: GUANGZHOU QUANSHENGWEI INFORMATION TECHNOLOGY Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant |