CN117014259A - Channel recording method, device and equipment based on 5G downlink periodic reference signal - Google Patents
Channel recording method, device and equipment based on 5G downlink periodic reference signal Download PDFInfo
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Abstract
The invention discloses a channel recording method, a device and equipment based on a 5G downlink periodic reference signal, and relates to the technical field of 5G communication, wherein the method mainly comprises the steps of performing down-conversion processing, time-frequency synchronization and OFDM demodulation on a downlink signal of a 5G operator to obtain a resource grid; determining the time domain position and the frequency domain position of a channel state information reference signal (CSI-RS) according to the resource grid; according to the configuration parameters of the periodical CSI-RS, a local CSI-RS symbol is generated, and the periodical CSI-RS is extracted according to the time domain position and the frequency domain position of the CSI-RS. And performing correlation operation on the generated local CSI-RS symbols and the extracted periodic CSI-RS to obtain a channel estimation matrix, and obtaining channel impulse response according to the channel estimation matrix. The invention can avoid the extra occupation of the wireless resource of the base station, improve the multipath resolution capability and finely and accurately measure the wireless channel.
Description
Technical Field
The present invention relates to the field of 5G communications technologies, and in particular, to a method, an apparatus, and a device for recording a channel based on a 5G downlink periodic reference signal.
Background
The principle of wireless channel measurement is that a transmitter transmits a transmission signal (also called a probe signal) known to a receiver, the receiver carries out channel estimation through the known transmission signal, determines channel impulse response or channel frequency response, acquires channel characteristic parameters, and completes wireless channel measurement. Wireless channel measurements can be generally classified into active channel measurements by self-erecting transmitters and passive channel measurements that rely on existing operating communication networks.
The active channel measurement adopts a channel detection method, a transmitter and a receiver are built on site, and channel parameters are obtained by using a known method for carrying out correlation calculation on a transmitted signal and a received signal. The common methods for active channel measurement mainly include: periodic pulse measurement, pseudo-random sequence measurement, frequency domain measurement, multitone signal measurement, and the like. However, the active channel measurement method still has a plurality of defects, and in various scenes such as a high-speed railway scene, a car networking scene and the like, the construction of the transmitter on site has certain engineering difficulty, so that the method is difficult to realize. At this time, the passive channel measurement for channel measurement by analyzing the downlink signal of the operation communication network is more advantageous without constructing a transmitter by itself.
The passive channel measurement adopts a channel estimation method, a transmitter is not required to be built, and the channel estimation is carried out by combining a specific signal under the existing operation communication network to obtain the channel characteristic parameters. A large amount of channel measurement work is performed in a 2G communication system using narrowband test signals; in 3G communication system, intensive research is conducted on channel characteristics aiming at downlink signals; in a 4G communication system, cell reference signals (Cell Reference Signal, CRS) carried by a base station are utilized for channel detection, and an important reference is provided for system design. But for the current 5G communication system, due to the principles of saving system overhead and reducing frequency resource occupation, a series of common signaling is cancelled, and a synchronization signal block (Synchronization Signal and PBCH block, SSB) is used instead. SSBs are transmitted only over a limited bandwidth and have a larger period, which can be used for power measurements such as path loss and average channel quality.
At present, passive channel measurements in 5G communication systems are developed based on SSBs, which are not suitable for development on channels that change rapidly in time and/or frequency, taking into account their limited bandwidth and low duty cycle.
Disclosure of Invention
The invention aims to provide a channel recording method, device and equipment based on a 5G downlink periodic reference signal so as to solve the problems.
In order to achieve the above object, the present invention provides the following.
In a first aspect, the present invention provides a channel recording method based on a 5G downlink periodic reference signal, including: and acquiring a downlink signal of the 5G operator. And processing the downlink signal of the 5G operator to obtain a baseband signal. And carrying out time-frequency synchronization and OFDM demodulation on the baseband signal to obtain a resource grid. And determining the time domain position and the frequency domain position of the channel state information reference signal (CSI-RS) based on the resource grid obtained by demodulation. Acquiring configuration parameters of a periodic CSI-RS; the configuration parameters of the periodic CSI-RS comprise time domain characteristic parameters and frequency domain characteristic parameters. And generating a local CSI-RS symbol and extracting the periodic CSI-RS from the resource grid according to the configuration parameters of the periodic CSI-RS. And performing correlation operation on the generated local CSI-RS symbols and the extracted periodic CSI-RS to obtain a channel estimation matrix, and obtaining channel impulse response according to the channel estimation matrix.
In a second aspect, the present invention provides a channel recording system based on a 5G downlink periodic reference signal, including: and the downlink signal acquisition module is used for acquiring the downlink signal of the 5G operator. And the baseband signal determining module is used for processing the downlink signal of the 5G operator to obtain a baseband signal. And the resource grid determining module is used for carrying out time-frequency synchronization and OFDM demodulation on the baseband signal to obtain a resource grid. And the time-frequency position determining module is used for determining the time domain position and the frequency domain position of the channel state information reference signal (CSI-RS) based on the demodulated resource grid. A configuration parameter acquisition module, configured to acquire configuration parameters of the periodic CSI-RS; the configuration parameters of the periodic CSI-RS comprise time domain characteristic parameters and frequency domain characteristic parameters. And the extraction module is used for generating a local CSI-RS symbol according to the configuration parameters of the periodical CSI-RS and extracting the periodical CSI-RS from the resource grid. The channel impulse response obtaining module is used for carrying out correlation operation on the generated local CSI-RS symbols and the extracted periodical CSI-RS to obtain a channel estimation matrix, and obtaining the channel impulse response according to the channel estimation matrix.
In a third aspect, the present invention provides an electronic device, including a memory and a processor, where the memory is configured to store a computer program, and the processor is configured to cause the electronic device to perform the channel recording method according to the first aspect, where the channel recording method is based on a 5G downlink periodic reference signal.
According to the specific embodiments provided by the invention, the following technical effects are disclosed.
1. And the periodic full bandwidth signal in the 5G downlink is used as a target sequence for channel measurement, so that the extra occupation of the wireless resource of the base station is avoided. In the invention, the CSI-RS symbols are distributed in the full frequency band, each resource block in the frequency domain occupies 3 subcarriers, the subcarrier interval is 30kHz, and the minimum time delay resolution isNanosecond, improve the multipath resolution capability, can carefully and accurately carry out wireless channel measurement.
2. The traditional wireless channel recording needs to reasonably relate to the characteristics of a detection signal structure, a sequence and the like, the CSI-RS signal is a standard 5G downlink reference signal, and the CSI-RS signal is used for channel recording, so that the performance evaluation and the network verification can be carried out on the existing 5G operation network.
3. The invention is oriented to 5G base station signals, does not need to erect transmitting equipment and construct and install a measuring antenna in the measuring process, does not need to coordinate with a network operation unit, has extremely low overall implementation difficulty, and avoids the engineering problems of frequency band interference and joint modulation joint measurement brought by the traditional channel measuring work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a channel recording method based on a 5G downlink periodic reference signal according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a CDM pattern of NR support provided by an embodiment of the present invention.
Fig. 3 is a schematic diagram of a 5G downlink periodic reference signal listening search process according to an embodiment of the present invention.
Fig. 4 is a block diagram of a channel recording system based on a 5G downlink periodic reference signal according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As a reference signal in the 5G downlink channel, a channel state information reference signal (Channel state information reference signal, CSI-RS) mainly has the following functions: the method comprises (1) obtaining channel state information; (2) beam management; (3) time-frequency tracking, namely accurately measuring time offset and frequency offset; (4) Mobility management, namely, tracking and measuring the CSI-RS of a local area and a neighbor area; (5) rate matching.
The CSI-RS has certain time domain periodicity and frequency domain full bandwidth characteristics, can be used as a target signal, designs a corresponding channel measurement method and develops a corresponding system and electronic equipment. The channel recording method based on the CSI-RS can greatly improve the measurement accuracy and fully reflect the wireless channel characteristics of the 5G communication system.
Fig. 1 is a flow chart of a channel recording method based on a 5G downlink periodic reference signal according to an embodiment of the present invention, as shown in fig. 1, where the channel recording method based on a 5G downlink periodic reference signal according to the embodiment includes the following steps.
Step 100: and acquiring a downlink signal of the 5G operator.
According to the wireless resource allocation of each operator in China and the division result of each frequency band of 5G by 3GPP standard TS 38.104, the frequency bands of N1, N41, N77, N78 and the like and the corresponding acquisition bandwidths can be selected according to the relevant configuration, as shown in Table 1.
Table 1 radio resource allocation table for each operator in China
。
Step 200: and processing the downlink signal of the 5G operator to obtain a baseband signal.
In this embodiment, step 200 specifically includes: and performing down-conversion processing on the downlink signal of the 5G operator according to the carrier frequency to obtain a carrier signal, and then performing radio frequency processing on the carrier signal to obtain a baseband signal.
Step 300: and carrying out time-frequency synchronization and OFDM demodulation on the baseband signal to obtain a resource grid.
In this embodiment, the step 300 specifically includes: and carrying out time frequency offset estimation and correction on the baseband signal to realize time domain and frequency domain synchronization, obtaining a signal after downlink synchronization, carrying out serial-parallel conversion on the signal after downlink synchronization to obtain a plurality of low-rate code streams, and carrying out FFT (fast Fourier transform) on the low-rate code streams to realize OFDM (orthogonal frequency division multiplexing) demodulation and obtain corresponding resource grids.
Step 400: and determining the time domain position and the frequency domain position of the channel state information reference signal (CSI-RS) based on the resource grid obtained by demodulation.
In this embodiment, step 400 specifically includes: firstly, a synchronization signal block SSB is utilized to complete a cell searching process to obtain a current cell physical identifierThe method comprises the steps of carrying out a first treatment on the surface of the Secondly, according to the physical identification of the current cell +.>Scanning SSB wave beams in a current cell, calculating power of demodulation reference signals DM-RS in a Physical Broadcast Channel (PBCH) in the SSB, and obtaining an index SSB index corresponding to the SSB of the optimal wave beam based on a maximum SNR (Signal power/noise) principle; then according to the current cell physical identity +.>And SSB beam index SSB index to perform time domain and frequency domain positioning on SSB of the optimal beam to obtain SSB OFDM symbol index +.>(i.e. corresponding time domain position) and SSB subcarrier index +.>(i.e., the corresponding frequency domain location).
Step 500: acquiring configuration parameters of a periodic CSI-RS; the configuration parameters of the periodic CSI-RS comprise time domain characteristic parameters and frequency domain characteristic parameters, and can be applied to extraction, generation and wireless channel analysis of the CSI-RS in the subsequent process.
Referring to 3GPP standards TS38.211, TS 38.214, and TS 38.331, time-domain, frequency-domain characteristics of the CSI-RS (configuration parameters of the CSI-RS) can be summarized as follows.
Time domain characteristic parameters: the time domain behavior of the CSI-RS resource set may be configured by a higher layer parameter resource Type in CSI-ResourceConfig IE, and may be specifically classified into Periodic (Periodic), semi-persistent (Semi-persistent), and Aperiodic (Aperiodic).
Equation (1) should be satisfied for the periodic CSI-RS resource, its transmission slot.
（1）。
Wherein,for subcarrier spacing +.>The number of slots in each frame under configuration, < >>For system frame number, & gt>Is subcarrier spacing +.>Slot index in each frame under configuration, +.>For slot offset, ++>Is a transmission period of the CSI-RS. For periodic CSI-RS resources, the transmission period +.>And slot offset->Are configured by the higher layer parameter periodicityAndOffset.
The time domain position of the CSI-RS symbol (which means that the specific CSI-RS under the resource grid is obtained after OFDM demodulation) in each PRB (Physical Resource Block) is indicated by the higher layer RRC signaling. For single symbol CSI-RS, only one OFDM symbol is occupied, and the data is usedSource occupancy start symbol position is defined by l 0 An indication; for multi-symbol CSI-RS, two OFDM symbols are occupied, and the initial symbol position occupied by the resource is l 2 And l 3 Indication, according to the scene of use, of the pair l 2 And l 3 Distinguishing between them.
Frequency domain characteristic parameters: the resource mapping configuration parameters of the RRC layer CSI-RS define relevant contents about the CSI-RS frequency domain resources, namely frequencyDomainAllocation, freqBand, CDM-type, nrofPorts and reliability.
frequencyDomainalllocation: the parameter is used for configuring CSI-RS frequency domain resources, and the value of the parameter is obtained through table lookup (3 GPP TS 38.211-Table7.4.1.5.3-1). Determining the frequency domain related characteristics of the current CSI-RS resource by inquiring the number of lines; for other type configurations, specific frequency domain characteristics need to be determined in combination with the parameters { nrofPorts, CDM-type, density }.
Table 2 CSI-RS physical resource mapping parameters
/>
。
freqBand: the starting RB position of the CSI-RS symbol and the number of RBs occupied by the frequency domain are specified.
cdm-Type: the multiplexing type of the multi-port CSI-RS is specified: no CDM, FD-CDM2, CDM4, CDM8, as shown in FIG. 2. And the code division multiplexing mode based on the orthogonal code words is adopted for CSI-RS symbol transmission, and CDM can spread the coverage area of the CSI-RS symbols to realize the improvement of the transmitting power of the CSI-RS ports. For multi-port CSI-RS,3GPP protocols specify 3 CDM patterns: CDM-2, CDM-4 (FD 2/TD 2) and CDM-8 (FD 2/TD 4). FD2 represents two REs occupied consecutively in the frequency domain; TD2 represents that two REs are occupied consecutively in the time domain. As shown in fig. 2, each CDM group may cover 2,4, or 8 ports.
nrofPorts: one RE in the frequency domain and one OFDM symbol in the time domain are one CSI-RS port. The number of ports supported by NR CSI-RS is: x=1, 2,4,8, 12, 16, 24 and 32.
Density: the density of CSI-RS support is 0.5,1,3. When the density is 0.5, channel state information transmission is carried out on every other PRB, and the number of the occupied PRB is indicated by the RRC parameter; when the density is 1, the pilot frequency overhead can be reduced, and the method is only used for obtaining the channel state information; at a density of 3, the CSI-RS symbol can only be used for high accuracy beam management and measurement.
Step 600: and generating a local CSI-RS symbol and extracting the periodic CSI-RS from the resource grid according to the configuration parameters of the periodic CSI-RS.
Generating sequence of CSI-RS symbolsAs shown in formula (2)>Is an intra-sequence index.
（2）。
Wherein the pseudo-random sequenceInitializing according to the following formula>、/>And l is the number of OFDM symbols in the time slot, the time slot position and the OFDM symbol position in the time slot respectively. />Scrambling ID indicated for higher layer RRC.
（3）。
Is the slot number in the radio frame, l is the OFDM symbol number in the slot, < >>Equal to the higher layer parameter scramblingID or sequence generation Config, the value range is 0-1023.
CSI-RS sequencesAfter the generation, the mapping of the physical resources to the time-frequency positions k and l is completed according to the following rules: />
（3）。
Wherein,for mapping to a sequence of antenna ports, p is the antenna port,/->Is subcarrier spacing configuration, k and l are frequency domain position and time domain position of RE occupied by CSI-RS symbol on whole resource grid,/>Is the Power offset of the RE of the CSI-RS relative to the RE of the SSB, for Non-Zero Power CSI-RS (NZP CSI-RS),should be greater than 0 (given by the higher layer parameter powerControlOffsetSS in the NZP-CSI-RS-Resource IE),is->Time/frequency domain OCC of CDM type to ensure orthogonality of ports within a certain CDM Group multiplexing the RE.
Is subcarrier 0 of common resource block (Common Resource Block, CRB) 0, i.e., point a.
Is an intra-sequence index, wherein->Is the number of antenna ports.
To be the offset of a subcarrier within a CDM Group, +.>Is the starting position of the sub-carriers within the CDM Group.Wherein n is CRB index where CSI-RS is located, < >>The number of subcarriers in one RB is represented.
To be the offset of a sub-symbol within a CDM Group, +.>For onset of symbols within CDM GroupA starting position.
The resource mapping parameters for different CDM schemes are different and are shown in table 2, and each parameter is described below.
X is the antenna port number of the CSI-RS: given by the high-level parameter nrofPort.
。
For the density of CSI-RS in the frequency domain: given by the higher layer parameter density in the CSI-RS-ResourceMapping IE or CSI-RS-Cellmobility IE, < >>For representing the number of correspondingly included CSI-RSs on each RB.
CDM-Type is CDM Type of CSI-RS: given by the high-level parameter cdm-Type in CSI-RS-ResourceMapping IE.
Starting position for CDM group: the frequency position at which the CDM group starts is given by the higher layer parameter frequencydomaimatillation in CSI-RS-ResourceMapping IE or CSI-RS-ResourceConfigMobility IE; the time position of the beginning of the CDM group is given by the higher layer parameters first OFDMSymbolInTimeDomain and first OFDMSymbolInTimeDomain2 in CSI-RS-ResourceMapping IE or CSI-RS-ResourceConfigMobility IE.
CDM group index j is CDM group index: CDM group index and CDM group time-frequency positionOne-to-one correspondence. And the sequence numbers of the time domain distribution and the increment are increased according to the frequency domain distribution.
For RE index within CDM group: orthogonal mask on each RE in CDM group +.>Is->As shown in tables 3-6.
TABLE 3 NOCDM corresponding code group
。
TABLE 4 fd-CDM2 corresponding code group
。
TABLE 5 cdm4-FD2-TD2 corresponding code group
。
TABLE 6 cdm8-FD2-TD4 corresponding code group
。
(7) And performing correlation operation on the generated local CSI-RS symbol and the extracted periodic CSI-RS to obtain a channel estimation matrix H, and obtaining a channel impulse response (Channel Impulse Response, CIR) according to the channel estimation matrix H, wherein the specific steps are as follows.
Fig. 3 is a time-frequency positioning, extracting and wireless channel analyzing process of the 5G downlink periodic reference signal, which specifically includes the following steps:
(1) Acquiring a Synchronous Signal Block (SSB) from the acquired 5G base station downlink signal, and acquiring a cell physical identifier by using a sliding correlation method after time-frequency synchronization is completed。
(2) And performing blind estimation by using a demodulation reference signal (DM-RS) carried by a Physical Broadcast Channel (PBCH) in the SSB to obtain a signal-to-noise ratio (SNR), and obtaining the optimal SSB beam index-SSB index in the current cell according to a maximum SNR criterion.
(3) Time-frequency position acquisition of the synchronous signal block is realized by utilizing the optimal SSB wave beam index to obtain the subcarrier index thereofAnd OFDM index->。
(4) Acquiring a CSI-RS configuration parameter field (configuration parameter of a CSI-RS) from the intercepted 5G base station configuration parameter, wherein the CSI-RS configuration parameter comprises time-frequency domain configuration (frequencyDomainAllocation, freqBand, CDM-type, nrofPorts and density) of a reference signal and a period periodicity, SSB relative offsetEtc.
(5) Based on the time-frequency position of the SSB and the CSI-RS configuration parameter field, the time-frequency resource positioning and extraction of the periodic reference signal Y in the 5G base station downlink signal are realized, and meanwhile the local CSI-RS signal X is generated.
(6) And performing correlation calculation according to the acquired CSI-RS signals and the local CSI-RS signals to obtain channel information.
(7) The wireless channel characteristic analysis and channel impulse response calculation process is as follows.
The 5G communication system adopts an OFDM modulation mode, X represents a local periodic reference signal on a frequency domain, H and N respectively represent a channel matrix and additive Gaussian white noise, and the periodic reference signal extracted from a received signal after passing through a multipath channel can be expressed as:
（4）。
where p represents the number of OFDM symbols for the subcarrier,representing the corresponding frequency response function on the kth subcarrier. Thus, the first and second substrates are bonded together,estimate of frequency domain response +.>Can be expressed as:
（5）。
bringing formula (4) into formula (5) yields:
（6）。
can be simplified and obtained,
（7）。
the CFR is subjected to inverse fourier transform to obtain the CIR:
（8）。
and (3) calculating a power delay spectrum according to the channel impulse response, and after calculating the power delay spectrum, carrying out peak detection and extracting the multipath distribution condition.
The method of the present invention is described below by way of an example.
Wireless channel recording is performed in a high-speed railway environment (a 5G special column is an example).
And the Beijing Zhang Gaotie builds more than 300 macro base stations for mounting three operators' communication equipment on the whole line, and realizes 5G network coverage of China telecom, china Mobile and China Unicom. The receiver is placed on a high-speed train, the receiving end realizes center frequency configuration based on different network frequency bands, and signal acquisition and storage are completed through a mixer, a filter, down-conversion and other modules. And performing time-frequency synchronization, OFDM demodulation and other operations on the received signal to obtain a CSI-RS symbol, then performing frequency domain division, FFT conversion and CIR calculation on the CSI-RS symbol and the reference CSI-RS symbol, and obtaining a power delay spectrum of the high-speed rail 5G channel through the CIR. After obtaining the information such as 5G base station site, configuration, transmitting power, antenna radiation pattern, etc., channel characteristic parameters such as path loss, shadow fading, MIMO correlation, etc. can be performed. Based on the Beijing 5G wireless channel model, data support can be provided for the base station deployment, network optimization, performance analysis and other works.
In order to execute the corresponding method to realize the corresponding functions and technical effects, a channel recording system based on the 5G downlink periodic reference signal is provided below.
The channel recording system based on the 5G downlink periodic reference signal provided by the embodiment of the invention comprises the following modules.
And the downlink signal acquisition module is used for acquiring the downlink signal of the 5G operator.
And the baseband signal determining module is used for processing the downlink signal of the 5G operator to obtain a baseband signal.
And the resource grid determining module is used for carrying out time-frequency synchronization and OFDM demodulation on the baseband signal to obtain a resource grid.
And the time-frequency position determining module is used for determining the time domain position and the frequency domain position of the channel state information reference signal (CSI-RS) based on the demodulated resource grid.
A configuration parameter acquisition module, configured to acquire configuration parameters of the periodic CSI-RS; the configuration parameters of the periodic CSI-RS comprise time domain characteristic parameters and frequency domain characteristic parameters.
And the extraction module is used for generating a local CSI-RS symbol according to the configuration parameters of the periodical CSI-RS and extracting the periodical CSI-RS from the resource grid.
The channel impulse response obtaining module is used for carrying out correlation operation on the generated local CSI-RS symbols and the extracted periodical CSI-RS to obtain a channel estimation matrix, and obtaining the channel impulse response according to the channel estimation matrix.
The embodiment of the invention also provides an electronic device which comprises a memory and a processor, wherein the memory is used for storing a computer program, and the processor runs the computer program to enable the electronic device to execute a channel recording method based on the 5G downlink periodic reference signal.
Alternatively, the electronic device may be a server.
In addition, an embodiment of the present invention further provides a computer readable storage medium storing a computer program, where the computer program when executed by a processor implements a channel recording method based on a 5G downlink periodic reference signal.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. The channel recording method based on the 5G downlink periodic reference signal is characterized by comprising the following steps:
acquiring a downlink signal of a 5G operator;
processing the downlink signal of the 5G operator to obtain a baseband signal;
performing time-frequency synchronization and OFDM demodulation on the baseband signal to obtain a resource grid;
determining the time domain position and the frequency domain position of a channel state information reference signal (CSI-RS) based on the resource grid obtained by demodulation;
acquiring configuration parameters of a periodic CSI-RS; the configuration parameters of the periodic CSI-RS comprise time domain characteristic parameters and frequency domain characteristic parameters;
generating a local CSI-RS symbol and extracting the periodic CSI-RS from a resource grid according to configuration parameters of the periodic CSI-RS;
and performing correlation operation on the generated local CSI-RS symbols and the extracted periodic CSI-RS to obtain a channel estimation matrix, and obtaining channel impulse response according to the channel estimation matrix.
2. The channel recording method based on the 5G downlink periodic reference signal according to claim 1, wherein the processing the downlink signal of the 5G operator to obtain the baseband signal specifically includes:
performing down-conversion processing on the downlink signal of the 5G operator according to the carrier frequency to obtain a carrier signal;
and carrying out radio frequency processing on the carrier signal to obtain a baseband signal.
3. The method for recording a channel based on a 5G downlink periodic reference signal according to claim 1, wherein the method for performing time-frequency synchronization and OFDM demodulation on a baseband signal to obtain a resource grid specifically comprises:
performing time frequency offset estimation and correction on the baseband signal to realize time domain and frequency domain synchronization and obtain a signal after downlink synchronization;
serial-parallel conversion is carried out on the signals after downlink synchronization to obtain a plurality of low-rate code streams;
and carrying out FFT (fast Fourier transform) on the low-rate code stream to realize OFDM demodulation and obtain a corresponding resource grid.
4. The method for recording a channel based on a 5G downlink periodic reference signal according to claim 1, wherein determining a time domain position and a frequency domain position of a channel state information reference signal CSI-RS based on a resource grid obtained by demodulation specifically includes:
completing a cell searching process by using a synchronous signal block SSB to obtain a current cell physical identifier;
scanning SSB wave beams in a current cell according to the physical identifier of the current cell, calculating the power of demodulation DM-RS in a physical broadcast channel, and obtaining SSB wave beam index SSB index based on the maximum SNR principle;
and performing time domain positioning and frequency domain positioning on the SSB of the optimal beam according to the physical identifier of the current cell and the SSB beam index SSB index to obtain an SSB OFDM symbol index and an SSB subcarrier index.
5. The method for recording a channel based on a 5G downlink periodic reference signal according to claim 4, wherein the step of completing a cell search process by using a synchronization signal block SSB to obtain a current cell physical identifier specifically comprises:
and completing a cell searching process by using the synchronous signal block SSB and a sliding correlation method to obtain the physical identifier of the current cell.
6. The channel recording method based on the 5G downlink periodic reference signal according to claim 1, wherein the periodic CSI-RS is extracted from a resource grid, and specifically comprises:
and obtaining the periodic CSI-RS by using the configuration parameters of the periodic CSI-RS and the time domain position and the frequency domain position of the CSI-RS determined from the resource grid.
7. A channel recording system based on a 5G downlink periodic reference signal, comprising:
the downlink signal acquisition module is used for acquiring a downlink signal of the 5G operator;
the baseband signal determining module is used for processing the downlink signal of the 5G operator to obtain a baseband signal;
the resource grid determining module is used for carrying out time-frequency synchronization and OFDM demodulation on the baseband signals to obtain a resource grid;
the time-frequency position determining module is used for determining the time domain position and the frequency domain position of the channel state information reference signal (CSI-RS) based on the resource grid obtained by demodulation;
a configuration parameter acquisition module, configured to acquire configuration parameters of the periodic CSI-RS; the configuration parameters of the periodic CSI-RS comprise time domain characteristic parameters and frequency domain characteristic parameters;
the extraction module is used for generating a local CSI-RS symbol and extracting the periodic CSI-RS from the resource grid according to the configuration parameters of the periodic CSI-RS;
the channel impulse response obtaining module is used for carrying out correlation operation on the generated local CSI-RS symbols and the extracted periodical CSI-RS to obtain a channel estimation matrix, and obtaining the channel impulse response according to the channel estimation matrix.
8. An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform a channel recording method based on a 5G downlink periodic reference signal according to any one of claims 1 to 6.
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Application publication date: 20231107 Assignee: Wuhan Tianbo Bochuang Technology Co.,Ltd. Assignor: Beijing Jiaotong University Contract record no.: X2024980005773 Denomination of invention: Channel recording method, device, and equipment based on 5G downlink periodic reference signal Granted publication date: 20240102 License type: Common License Record date: 20240514 |