CN115987725A - Time offset processing method and device based on multi-user DMRS (demodulation reference signal) channel - Google Patents
Time offset processing method and device based on multi-user DMRS (demodulation reference signal) channel Download PDFInfo
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Abstract
The invention discloses a time offset processing method and a device based on a multi-user DMRS channel, wherein the method comprises the following steps: when a base station is accessed with a plurality of user terminals, the number of demodulation reference signals configured on the current time slot of a current channel is determined, the number of the demodulation reference signals is configured by the base station, then a demodulation reference measurement signal is extracted from frequency domain data in communication signals of each user terminal, a demodulation reference sending sequence corresponding to the user terminal is generated, channel estimation response corresponding to the user terminal is calculated according to the demodulation reference sending sequence, time offset values of the channel corresponding to each user terminal are calculated according to the signal estimation response, finally, deviation compensation is carried out on the channel estimation response corresponding to each user terminal by utilizing the deviation value of the channel corresponding to each user terminal, and finally, channel estimation corresponding to each user terminal is obtained. The scheme can eliminate different deviation influences among the user terminals and ensure the performance of channel estimation.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a time offset processing method and device based on a multi-user DMRS channel, a base station communication system and a readable storage medium.
Background
At present, with the increasing promotion of communication technology, the number of users accessed by a 5G small cell is also increasing, and due to the influence of multipath of a wireless channel, a demodulation-reference-signal (DMRS) is delayed in spatial transmission, and delays of DMRSs of different UEs (user terminals) when arriving at the 5G small cell are different. It is generally considered that the wireless channel is subject to the rayleigh or rice distribution, and the influence of the time offset or frequency offset will cause the signal receiving power and the signal-to-noise ratio to vary by a certain extent, and the varying extent is related to the actual channel condition. According to actual environment measured data, the calculated DMRS channel estimation response H of each UE is not accurate enough under the scene of large time frequency offset, which can cause the problems of reduced demodulation threshold, overall shift down of the working point of the signal to noise ratio and the like.
In view of the above, it is necessary to provide a further improvement on the current signal time offset calculation method.
Disclosure of Invention
In order to solve at least one of the above technical problems, a primary object of the present invention is to provide a time offset processing method and apparatus based on a multi-user DMRS channel.
In order to achieve the purpose, the invention adopts a technical scheme that: the time offset processing method based on the multi-user DMRS channel comprises the following steps:
when a base station is accessed with a plurality of user terminals, determining the number of demodulation reference signals configured on the current time slot of a current channel, wherein the number of the demodulation reference signals is configured by the base station, and the number of the demodulation reference signals is greater than or equal to 1;
extracting a demodulation reference measurement signal from frequency domain data in the received communication signal of each user terminal;
generating a demodulation reference sending sequence corresponding to the user terminal;
calculating channel estimation response corresponding to the user terminal according to the demodulation reference sending sequence, and calculating deviation value of a channel corresponding to each user terminal according to the signal estimation response; and
and performing deviation compensation on the channel estimation response corresponding to each user terminal by using the deviation value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
The number of the demodulation reference signals is configured by the base station according to the peak flow, the number of the demodulation reference signals is one, and the deviation value is specifically a time deviation value.
The number of the demodulation reference signals is configured by a base station according to the base station performance and the flow, the number of the demodulation reference signals is two or more, and the deviation value of a channel corresponding to each user terminal is calculated according to the signal estimation response; and performing bias compensation on the channel estimation response corresponding to each user terminal by using the bias value of the channel corresponding to each user terminal, specifically comprising:
calculating a corresponding time offset value according to the channel estimation response of each user terminal;
calculating a corresponding frequency offset value according to the channel estimation response of each user terminal;
and compensating the time-frequency offset of the channel estimation response corresponding to each user terminal by using the time-frequency offset value and the frequency offset value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
Wherein, the demodulation reference transmission sequence is generated according to 3GPP TS38.211 protocol 6.4.1.4.2 section.
In order to achieve the purpose, the invention adopts a technical scheme that: the base station time offset processing device based on the multi-user DMRS channel comprises:
a determining module, configured to determine, when a base station has multiple user terminals, the number of demodulation reference signals configured on a current time slot of a current channel, where the number of demodulation reference signals is configured by the base station, and the number of demodulation reference signals is greater than or equal to 1;
the extraction module is used for extracting a demodulation reference measurement signal from the frequency domain data in the received communication signal of each user terminal;
a generating module, configured to generate a demodulation reference transmission sequence corresponding to a user equipment;
the first estimation module is used for calculating channel estimation responses corresponding to the user terminals according to the demodulation reference sending sequence and calculating deviation values of channels corresponding to each user terminal according to the signal estimation responses; and
and the compensation module is used for performing deviation compensation on the channel estimation response corresponding to each user terminal by using the deviation value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
The number of the demodulation reference signals is configured by the base station according to the peak flow, the number of the demodulation reference signals is one, and the deviation value is specifically a time deviation value.
The number of the demodulation reference signals is configured by the base station according to the base station performance consideration traffic, the number of the demodulation reference signals is two or more, and the compensation module is further configured to:
calculating a corresponding time offset value according to the channel estimation response of each user terminal;
calculating a corresponding frequency offset value according to the channel estimation response of each user terminal;
and compensating the time-frequency offset of the channel estimation response corresponding to each user terminal by using the time-frequency offset value and the frequency offset value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
Wherein the demodulation reference transmission sequence is generated according to the 3GPP TS38.211 protocol section 6.4.1.4.2
In order to achieve the above object, the present invention adopts another technical solution as follows: there is provided a base station communication system including: the system comprises at least one 5G communication base station and a plurality of user terminals which are in communication connection with the 5G communication base station, wherein the 5G communication base station comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, and the steps of the method are realized when the processor executes the computer program.
In order to achieve the above object, the present invention adopts another technical solution as follows: a readable storage medium is provided, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, carries out the steps of the above-mentioned method.
The technical scheme of the invention mainly adopts the steps that when a base station is accessed with a plurality of user terminals, the number of demodulation reference signals configured on the current time slot of a current channel is determined, the number of the demodulation reference signals is configured by the base station, then a demodulation reference measurement signal is extracted from frequency domain data in communication signals of each user terminal, a demodulation reference sending sequence corresponding to the user terminal is generated, channel estimation response corresponding to the user terminal is calculated according to the demodulation reference sending sequence, the deviation value of the channel corresponding to each user terminal is calculated according to the signal estimation response, finally, the deviation compensation is carried out on the channel estimation response corresponding to each user terminal by utilizing the deviation value of the channel corresponding to each user terminal, finally, the channel estimation corresponding to each user terminal is obtained, different deviation influences among the user terminals can be eliminated, and the performance of the channel estimation is ensured. In addition, the scheme has more accurate calculation of channel estimation response, improves demodulation performance, and can effectively inhibit noise, thereby solving the problem that the signal-to-noise ratio working point is moved down in the prior art.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a flowchart of a time offset processing method based on a multi-user DMRS channel according to an embodiment of the present invention;
fig. 2 is a flowchart of an embodiment of a time offset processing method based on a multi-user DMRS channel according to an embodiment of the present invention;
fig. 3 is a flowchart of another embodiment of a time offset processing method based on a multi-user DMRS channel according to an embodiment of the present invention;
fig. 4 is a block diagram of a time offset processing apparatus based on a multi-user DMRS channel according to an embodiment of the present invention;
fig. 5 is a block diagram of a base station communication system according to an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the description of the invention relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In the prior art, the number of users accessed to a 5G small base station is easily influenced by wireless channel multipath, and large time frequency offset is generated, so that the problems of reduction of a demodulation threshold, integral shift down of a signal-to-noise ratio working point and the like are caused. Therefore, the scheme provides a multi-user DMRS channel-based time offset processing method, and aims to eliminate different time-frequency influences among UEs and ensure the performance of channel estimation. The specific steps of the method for processing the time offset based on the multi-user DMRS channel refer to the following embodiments.
Referring to fig. 1, fig. 1 is a flowchart illustrating a time offset processing method based on a multi-user DMRS channel according to an embodiment of the present invention. In the embodiment of the invention, the time offset processing method based on the multi-user DMRS channel is applied to interactive communication between a 5G communication base station and a plurality of User Equipments (UE). The method comprises the following steps:
s110, when a base station has a plurality of user terminals, determining the number of demodulation reference signals configured on the current time slot of the current channel, wherein the number of the demodulation reference signals is configured by the base station, and the number of the demodulation reference signals is greater than or equal to 1.
When the base station accesses a plurality of user terminals at the same time, communication signals of the user terminals are transmitted to the base station through the channels, and the base station processes information of the channels in the corresponding user terminals. For the base station, the base station is configured with demodulation reference signals, and the number of the demodulation reference signals is greater than or equal to 1.
And S120, extracting a demodulation reference measurement signal from the frequency domain data in the received communication signal of each user terminal.
When the base station communicates with a plurality of user terminals, the base station receives communication signals of the plurality of user terminals at the same time. In order to eliminate the influence of different time frequency offsets among a plurality of user terminals, a demodulation reference measurement signal is extracted from frequency domain data of a communication signal of the user terminal.
And S130, generating a demodulation reference transmission sequence corresponding to the user terminal.
The demodulation reference sending sequence corresponding to the user terminal is generated according to a preset 5G communication protocol, and specifically, the demodulation reference sending sequence is generated according to section 6.4.1.4.2 of the 3gpp ts38.211 protocol.
And S140, calculating channel estimation response corresponding to the user terminal according to the demodulation reference sending sequence, and calculating the deviation value of the channel corresponding to each user terminal according to the signal estimation response.
The channel estimation response is calculated using the LS algorithm (least squares estimation).
S150, performing deviation compensation on the channel estimation response corresponding to each user terminal by using the time bias value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
It should be noted that, when the number of demodulation references configured in the base station is 1, the offset value is a time offset value, and only time offset estimation and compensation are performed, and frequency offset estimation and compensation cannot be performed; when the number of demodulation references configured in the base station is two or more, the deviation values are time offset values and frequency offset values, and time offset estimation, frequency offset estimation and time offset compensation are required.
For better description of the present scheme, the following is separately described with respect to the case where the number of demodulation references is 1 and 1 or more.
Implement one
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for processing time offset based on a multi-user DMRS channel according to an embodiment of the present invention.
According to the requirement of a 5G small cell equipment system, under the condition of pursuing peak flow, only 1 DMRS is generally configured, the type of the DMRS is type-1, a pilot is configured at a symbol index 2, and the specific steps comprise:
s11, extracting DMRS (demodulation reference signal) measurement signals from received frequency domain data of user terminal
. Wherein k is DMRS subcarrier index, l is OFDM (orthogonal frequency division multiplexing) symbol index where the preamble pilot is located, and μ is user index. In order to eliminate signal interference between UEs, the DMRS of each UE is frequency division multiplexed.
S12, generation of DMRS Transmission sequences for each UE by section 3GPP TS38.211 protocol 6.4.1.4.2
。
S13, calculating channel estimation response by adopting LS (least square estimation) algorithm
。
Based on the 5G small cell equipment, the 2-sending and 2-receiving configuration is supported currently. So for a 2-antenna scenario with a port index t of 0/1, the DMRS received signal for each UE can be represented by the following equation:
where n is noise, the channel response can be obtained by solving the above equation:
s14, utilizing the channel estimation response of each UE
Estimating a time offset value TA corresponding to each UE, wherein the phase rotation is estimated as follows, H is a transposition conjugate operation:
TA estimation:
at this time, the process of the present invention,
the value is configured to be 4096 (FFT sample points). For DMRS type-1, index values of DMRS are 1,3,5,7,9, 11 within 1 RB, L is configured to be 4, illustrating that a rotation factor is calculated using 1 and 5,3 and 7, and angle is an arctangent function.
S15, corresponding to each calculated UE
Responding to the channel estimation corresponding to each UE
And performing time offset compensation to obtain the final channel estimation corresponding to each UE, wherein the formula is as follows:
wherein j is a complex number.
Example two
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for processing time offset based on a multi-user DMRS channel according to another embodiment of the present invention.
When the performance of the base station gives consideration to the flow at the same time, 2 DMRSs are configured, the type of the DMRS is configured to be type-1, a pilot is configured on a symbol index 2, and an additional pilot is configured on a symbol index 11. Steps S11 to S14 in the second embodiment are the same as the first four steps in the first embodiment, and are not described again here. The steps of S15-S16 of example two are as follows:
s15, utilizing the channel estimation response of each UE
Estimating a frequency offset value FO corresponding to each UE, wherein a specific formula is as follows:
wherein d is the symbol index difference value of the pilot preamble and the additional pilot.
S16, the TA and FO values calculated by each UE to the channel estimation response of each UE
And performing time-frequency offset compensation to obtain final channel estimation (including a pilot and an additional pilot) corresponding to each UE, wherein the specific calculation formula is as follows:
referring to fig. 4, fig. 4 is a block diagram of a time offset processing apparatus based on a multi-user DMRS channel according to an embodiment of the present invention. In an embodiment of the present invention, the base station time offset processing apparatus based on a multi-user DMRS channel includes:
a determining module 10, configured to determine, when a base station has multiple user terminals, the number of demodulation reference signals configured on a current time slot of a current channel, where the number of demodulation reference signals is configured by the base station, and the number of demodulation reference signals is greater than or equal to 1;
an extracting module 20, configured to extract a demodulation reference measurement signal from frequency domain data in the received communication signal of each ue;
a generating module 30, configured to generate a demodulation reference transmission sequence corresponding to a user equipment;
a first estimation module 40, configured to calculate a channel estimation response corresponding to the ue according to the demodulation reference sending sequence, and calculate a channel deviation value corresponding to each ue according to the signal estimation response; and
and a compensation module 50, configured to perform bias compensation on the channel estimation response corresponding to each ue by using the bias value of the channel corresponding to each ue, so as to obtain a final channel estimation corresponding to each ue.
The number of the demodulation reference signals is configured by the base station according to the peak flow, the number of the demodulation reference signals is one, and the deviation value is a time offset value.
Wherein, the number of the demodulation reference signals is configured by the base station according to the base station performance considering the traffic, the number of the demodulation reference signals is two or more, and the compensation module 50 is further configured to:
calculating a corresponding time offset value according to the channel estimation response of each user terminal;
calculating a corresponding frequency offset value according to the channel estimation response of each user terminal;
and compensating the time-frequency offset of the channel estimation response corresponding to each user terminal by using the time-frequency offset value and the frequency offset value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
Wherein the demodulation reference transmission sequence is generated according to section 6.4.1.4.2 of the 3GPP TS38.211 protocol
Referring to fig. 5, fig. 5 is a block diagram of a base station communication system according to an embodiment of the present invention. The base station communication system can be used for realizing the time offset processing method based on the multi-user DMRS channel in the embodiment. As shown in fig. 3, the base station communication system includes: at least a 5G communication base station, and a plurality of user terminals connected with the 5G communication base station in communication, the 5G communication base station includes a memory 301, a processor 302, a bus 303 and a computer program stored in the memory 301 and capable of running on the processor 302, the memory 301 and the processor 302 are connected through the bus 303. When the processor 302 executes the computer program, the wine identification method in the foregoing embodiment is implemented. Wherein the number of processors may be one or more.
The Memory 301 may be a Random Access Memory (RAM) Memory or a non-volatile Memory (non-volatile Memory), such as a magnetic disk Memory. The memory 301 is used for storing executable program code, and the processor 302 is coupled to the memory 301.
Further, an embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium may be provided in the base station communication system in the foregoing embodiments, and the computer-readable storage medium may be the memory in the foregoing embodiment shown in fig. 5.
The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the wine discrimination method in the foregoing embodiments. Further, the computer-readable medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a RAM, a magnetic disk, or an optical disk, and various media capable of storing program codes.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of modules is merely a division of logical functions, and an actual implementation may have another division, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or modules, and may be in an electrical, mechanical or other form.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a separate product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a readable storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present application. And the aforementioned readable storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
It should be noted that, for the sake of simplicity, the above-mentioned method embodiments are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A multi-user DMRS channel-based time offset processing method is characterized by comprising the following steps:
when a base station is accessed with a plurality of user terminals, determining the number of demodulation reference signals configured on the current time slot of the current channel, wherein the number of the demodulation reference signals is configured by the base station, and the number of the demodulation reference signals is greater than or equal to 1;
extracting a demodulation reference measurement signal from frequency domain data in the received communication signal of each user terminal;
generating a demodulation reference transmission sequence corresponding to the user terminal;
calculating channel estimation response corresponding to the user terminal according to the demodulation reference sending sequence, and calculating deviation value of a channel corresponding to each user terminal according to the signal estimation response; and
and performing deviation compensation on the channel estimation response corresponding to each user terminal by using the deviation value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
2. The method for processing the time offset based on the multi-user DMRS channel as claimed in claim 1, wherein the number of the demodulation reference signals is configured by a base station according to a peak traffic, the number of the demodulation reference signals is one, and the offset value is specifically a time offset value.
3. The method for processing the time offset based on the multi-user DMRS channel as claimed in claim 1, wherein the number of the demodulation reference signals is configured by a base station according to a performance of the base station while considering traffic, the number of the demodulation reference signals is two or more, and the offset value of the channel corresponding to each ue is calculated according to a signal estimation response; and performing bias compensation on the channel estimation response corresponding to each user terminal by using the bias value of the channel corresponding to each user terminal, specifically comprising:
calculating a corresponding time offset value according to the channel estimation response of each user terminal;
calculating a corresponding frequency offset value according to the channel estimation response of each user terminal;
and compensating the time-frequency offset of the channel estimation response corresponding to each user terminal by using the time-frequency offset value and the frequency offset value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
4. The multi-user DMRS channel based time offset processing method of any one of claims 1 to 3, wherein the demodulation reference transmission sequence is generated according to section 6.4.1.4.2 of a 3gpp ts38.211 protocol.
5. A base station time offset processing device based on multi-user DMRS channels is characterized in that the device comprises:
a determining module, configured to determine, when a base station has multiple user terminals, the number of demodulation reference signals configured in a current timeslot of a current channel, where the number of demodulation reference signals is configured by the base station, and the number of demodulation reference signals is greater than or equal to 1;
the extraction module is used for extracting a demodulation reference measurement signal from the frequency domain data in the received communication signal of each user terminal;
a generating module, configured to generate a demodulation reference transmission sequence corresponding to a user terminal;
the first estimation module is used for calculating channel estimation responses corresponding to the user terminals according to the demodulation reference sending sequence and calculating deviation values of channels corresponding to each user terminal according to the signal estimation responses; and
and the compensation module is used for performing deviation compensation on the channel estimation response corresponding to each user terminal by using the deviation value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
6. The apparatus for processing the time offset based on the multi-user DMRS channel as claimed in claim 5, wherein the number of the demodulation reference signals is configured by a base station according to a peak traffic, the number of the demodulation reference signals is one, and the offset value is specifically a time offset value.
7. The apparatus for processing time offset based on the multi-user DMRS channel of claim 5, wherein the number of demodulation reference signals is configured by a base station according to a base station performance compromise traffic, the number of demodulation reference signals is two or more, and the compensation module is further configured to:
calculating a corresponding time offset value according to the channel estimation response of each user terminal;
calculating a corresponding frequency offset value according to the channel estimation response of each user terminal;
and compensating the time frequency offset of the channel estimation response corresponding to each user terminal by using the time frequency offset value and the frequency offset value of the channel corresponding to each user terminal to obtain the final channel estimation corresponding to each user terminal.
8. The multi-user DMRS channel-based time bias processing device as claimed in any one of claims 5 to 7, wherein the demodulation reference transmission sequence is generated according to section 6.4.1.4.2 of the 3gpp ts38.211 protocol.
9. A base station communication system comprising: at least one 5G communication base station, and a plurality of user terminals communicatively connected to the 5G communication base station, wherein the 5G communication base station includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method according to any one of claims 1 to 4 when executing the computer program.
10. A readable storage medium on which a computer program is stored which, when executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
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