CN111988246B - Method, device, equipment and medium for detecting demodulation reference signal of broadcast channel - Google Patents
Method, device, equipment and medium for detecting demodulation reference signal of broadcast channel Download PDFInfo
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- CN111988246B CN111988246B CN202010895163.6A CN202010895163A CN111988246B CN 111988246 B CN111988246 B CN 111988246B CN 202010895163 A CN202010895163 A CN 202010895163A CN 111988246 B CN111988246 B CN 111988246B
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- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
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- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
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Abstract
The embodiment of the invention provides a method, a device, equipment and a storage medium for detecting a demodulation reference signal of a broadcast channel, which are used for eliminating the influence of channel fading, frequency offset and noise in the detection process and improving the detection accuracy. The method comprises the following steps: receiving frequency domain signals in a synchronization information block, wherein the frequency domain signals comprise a first auxiliary synchronization signal, a noise frequency domain signal and a first PBCH _ DMRS frequency domain signal; determining at least one channel estimation value according to the first auxiliary synchronization signal and a preset second auxiliary synchronization signal, and determining a noise power estimation value according to the noise frequency domain signal; performing channel equalization on the first PBCH _ DMRS frequency domain signal based on at least one channel estimation value and the noise power estimation value, and determining a second PBCH _ DMRS frequency domain signal; and determining the index number of the synchronization information block according to the second PBCH _ DMRS frequency domain signal, and performing channel estimation on the second PBCH _ DMRS frequency domain signal by using the index number.
Description
Technical Field
The present invention relates to the field of deep learning, and in particular, to a method, an apparatus, a device, and a medium for detecting a demodulation reference signal of a broadcast channel.
Background
In the 5G NR system, cell Synchronization is mainly performed by using SSB (Synchronization Signal and PBCH block, Synchronization information block) to implement downlink timeslot Synchronization, cell ID search, PBCH _ DMRS detection, MIB (master information block) acquisition, and the like, where cell Synchronization is the first step of implementing cell access by a UE (terminal), and whether normal operation of the UE directly affects whether the UE can find a cell and access the cell.
An SSB is mainly composed of 4 parts, namely, PSS (Primary Synchronization Signals), SSS (Secondary Synchronization Signals), PBCH (Physical Broadcast Channel), PBCH _ DMRS (Physical Broadcast Channel Demodulation Reference Signals), which are distributed on a time-frequency resource network as shown in fig. 1, and as seen from fig. 1, the SSB occupies 240 subcarriers (vertical axis) in the frequency domain and 4 symbols (horizontal axis) in the time domain, wherein the left-hatched part is a PSS (length-127 m sequence), the right-hatched part is an SSS (length-127 m sequence), the cross-hatched part is PBCH (length-432 data), the vertical-hatched part is h _ DMRS (length-144 pseudo random sequence), and the unfilled part is an empty subcarrier.
It should be noted that, according to the 3GPP protocol 38.211, the PBCH _ DMRS generated sequence and the index number of the SSB are known
Correlation, and the placed time-frequency position is correlated with the cell ID; additionally the last two columns in fig. 1 do not fall within the scope of SSB.
At the receiving end, the receiving demodulation block diagram is shown in fig. 2, as can be seen from fig. 2, the first step is to perform blind detection of PSS, mainly perform time domain sliding cross-correlation between the received signal and the locally generated standard PSS, since there are only 3 PSS types, 3 groups of correlation values can be obtained, and the group category corresponding to the maximum correlation value is found
And SSB symbol start position, wherein
The method is a group corresponding to a maximum correlation value obtained by performing correlation operation on a received PSS signal and a locally generated standard PSS signal.
The second step is to perform frequency offset estimation using the PSS, since already obtained
And the SSB symbol starting position, namely the waveform corresponding to the first symbol of the received signal from the starting position and the starting point of the correlation operation are known, the waveform corresponding to the first symbol can be taken out, the received signal is divided into two sections, the local standard PSS time domain signal is also divided into two sections for the correlation operation, then the conjugate multiplication and the angle calculation are carried out, and then the frequency offset estimation is obtained, and then the frequency offset compensation is carried out.
The third step is to carry out SSS blind detection, and the main realization mode is to use the received SSS and the locally generated standard SSS signalAnd performing frequency domain conjugate multiplication, wherein the SSS is regulated by the protocol to have 336 kinds in total, so that 336 groups of multiplication values can be obtained, and the group corresponding to the maximum value can be found to obtain
Wherein
The received SSS signal and the locally generated standard SSS signal are subjected to correlation operation to obtain a group corresponding to the maximum correlation value, and finally, the maximum correlation value is calculated according to a formula
A cell ID is obtained.
The fourth step is to carry out PBCH DMRS detection, according to the protocol, a total of 8 different PBCH DMRS sequences and SSB index numbers
Correlation, therefore, the received PBCH _ DMRS needs to be matched with the local standard PBCH _ DMRS signal, and the current main algorithm is to perform frequency domain conjugate multiplication and take the maximum value to obtain
The algorithm is as follows:
the PBCH DMRS frequency domain data is known as R (k), and the PBCH DMRS frequency domain data is known as R Local (k, i), wherein i is more than or equal to 0 and less than or equal to 7, then carrying out conjugate multiplication, and taking the maximum value:
obtain maximum value corresponding
I.e. the index number of the SSB is found.
Since R (k) is received data after being transmitted through an air interface channel, R (k) is influenced by factors such as channel fading, frequency offset, and noise, i.e., R (k) ═ R Local (k- ε, j). H (k) + n (k), where ε represents frequency offset, n (k) represents frequency domain noise, R Local And (k-epsilon, j) represents local PBCH-DMRS frequency domain data affected by frequency offset, and k represents kth PBCH-DMRS frequency domain data, so that the result of conjugate multiplication is affected when corresponding compensation is not carried out.
In summary, in the prior art, when the PBCH _ DMRS is detected, the influence of channel fading, frequency offset, and noise is not considered, and the accuracy of detection cannot be ensured.
Disclosure of Invention
The embodiment of the invention provides a method, a device, equipment and a storage medium for detecting a broadcast channel demodulation reference signal PBCH-DMRS, which are used for eliminating the influence of channel fading, frequency offset and noise in the detection process and improving the detection accuracy.
In a first aspect, an embodiment of the present invention provides a method for detecting a broadcast channel demodulation reference signal PBCH _ DMRS, which is applied to a terminal device, and the method includes:
receiving frequency domain signals in a synchronization information block, wherein the frequency domain signals comprise a first auxiliary synchronization signal, a noise frequency domain signal and a first PBCH _ DMRS frequency domain signal, and the first PBCH _ DMRS frequency domain signal is a PBCH _ DMRS signal overlapped with the first auxiliary synchronization signal in a frequency domain;
determining at least one channel estimation value according to the first auxiliary synchronization signal and a preset second auxiliary synchronization signal, and determining a noise power estimation value according to the noise frequency domain signal, wherein the preset second auxiliary synchronization signal is an auxiliary synchronization signal generated by the terminal equipment according to a first preset rule;
performing channel equalization on the first PBCH _ DMRS frequency domain signal based on at least one channel estimation value and the noise power estimation value, and determining a second PBCH _ DMRS frequency domain signal after the channel equalization;
and determining the index number of the synchronization information block according to the second PBCH _ DMRS frequency domain signal, and performing channel estimation on the second PBCH _ DMRS frequency domain signal by using the index number.
The method for detecting a PBCH-DMRS of a demodulation reference signal of a broadcast channel, provided by an embodiment of the invention, comprises the steps of firstly receiving frequency domain signals in a synchronization information block, wherein the frequency domain signals comprise a first auxiliary synchronization signal, a noise frequency domain signal and a first PBCH-DMRS frequency domain signal, the first PBCH-DMRS frequency domain signal is the PBCH-DMRS signal overlapped with the first auxiliary synchronization signal in the frequency domain, then determining at least one channel estimation value according to the first auxiliary synchronization signal and a preset second auxiliary synchronization signal, determining a noise power estimation value according to the noise frequency domain signal, carrying out channel equalization on the first PBCH-DMRS frequency domain signal based on the at least one channel estimation value and the noise power estimation value, determining a second PBCH-DMRS signal after the channel DMRS equalization, and compared with the prior art, on the one hand, realizing the compensation of errors caused by frequency deviation of the PBCH-DMRS frequency domain signal in the detection process, and on the other hand, the PBCH _ DMRS frequency domain signals are correspondingly compensated under the influence of channel fading and noise in the transmission process, finally, the index number of the synchronization information block is determined according to the second PBCH _ DMRS frequency domain signal, the index number is utilized to match the received PBCH _ DMRS with the preset PBCH _ DMRS signal, the matched PBCH _ DMRS is utilized to carry out channel estimation, and the current channel information is obtained, so that the detection accuracy is improved.
In one possible embodiment, the first secondary synchronization signal occupies at least one subcarrier;
determining at least one channel estimation value according to the first secondary synchronization signal and a preset second secondary synchronization signal, comprising:
and aiming at any subcarrier occupied by the first auxiliary synchronization signal, calculating the first auxiliary synchronization signal borne on the subcarrier and a second auxiliary synchronization signal corresponding to the subcarrier to obtain a channel estimation value corresponding to the subcarrier.
In one possible embodiment, the noise frequency domain signal occupies at least one null subcarrier;
determining a noise power estimation value according to the noise frequency domain signal, comprising: and taking the mean value of the squared noise frequency domain signals on at least one empty subcarrier as a noise power estimation value corresponding to the noise frequency domain signals.
In one possible embodiment, the first secondary synchronization signal occupies a first frequency domain interval and the noise frequency domain signal occupies a second frequency domain interval, wherein the first frequency domain interval and the second frequency domain interval constitute a frequency domain interval of the synchronization information block.
In one possible embodiment, the channel equalization of the first PBCH _ DMRS frequency domain signal based on the at least one channel estimation value and the noise power estimation value, and the determination of the channel equalized second PBCH _ DMRS frequency domain signal include:
determining a conjugate channel estimation value corresponding to each channel estimation value according to at least one channel estimation value;
determining a channel compensation value of the synchronization information block based on at least one channel estimation value, a conjugate channel estimation value corresponding to each channel estimation value and a noise power estimation value;
and taking the product of the channel compensation value and the first PBCH _ DMRS frequency domain signal as a second PBCH _ DMRS frequency domain signal after channel equalization.
In one possible implementation, determining an index number of the synchronization information block according to the second PBCH _ DMRS frequency domain signal includes:
matching the second PBCH _ DMRS frequency domain signal with a plurality of groups of preset PBCH _ DMRS frequency domain signals, wherein the preset PBCH _ DMRS frequency domain signals are PBCH _ DMRS frequency domain signals generated by the terminal equipment according to a second preset rule;
and determining the sequence number of the group corresponding to the maximum value in the matching result as the index number of the second PBCH _ DMRS in the synchronization information block.
In a second aspect, an embodiment of the present invention provides a device for detecting a broadcast channel demodulation reference signal PBCH _ DMRS, where the device includes:
a receiving unit, configured to receive frequency domain signals in a synchronization information block, where the frequency domain signals include a first secondary synchronization signal, a noise frequency domain signal, and a first PBCH _ DMRS frequency domain signal, where the first PBCH _ DMRS frequency domain signal is a PBCH _ DMRS signal that overlaps with the first secondary synchronization signal in a frequency domain;
a first determining unit, configured to determine at least one channel estimation value according to a first auxiliary synchronization signal and a preset second auxiliary synchronization signal, and determine a noise power estimation value according to a noise frequency domain signal, where the preset second auxiliary synchronization signal is an auxiliary synchronization signal generated by the apparatus according to a first preset rule;
a second determining unit, configured to perform channel equalization on the first PBCH _ DMRS frequency domain signal based on at least one channel estimation value and the noise power estimation value, and determine a second PBCH _ DMRS frequency domain signal after the channel equalization;
and the processing unit is used for determining the index number of the synchronization information block according to the second PBCH _ DMRS frequency domain signal and performing channel estimation on the second PBCH _ DMRS frequency domain signal by using the index number.
In one possible embodiment, the first secondary synchronization signal occupies at least one subcarrier;
the first determining unit is specifically configured to:
and aiming at any subcarrier occupied by the first auxiliary synchronization signal, calculating the first auxiliary synchronization signal borne on the subcarrier and a second auxiliary synchronization signal corresponding to the subcarrier to obtain a channel estimation value corresponding to the subcarrier.
In one possible embodiment, the noise frequency domain signal occupies at least one null subcarrier;
the first determining unit is specifically further configured to:
and taking the mean value of the squared noise frequency domain signals on at least one null subcarrier as a noise power estimation value corresponding to the noise frequency domain signals.
In one possible embodiment, the first secondary synchronization signal occupies a first frequency domain interval and the noise frequency domain signal occupies a second frequency domain interval, wherein the first frequency domain interval and the second frequency domain interval constitute a frequency domain interval of the synchronization information block.
In a possible implementation manner, the second determining unit is specifically configured to:
determining a conjugate channel estimation value corresponding to each channel estimation value according to at least one channel estimation value;
determining a channel compensation value of the synchronization information block based on at least one channel estimation value, a conjugate channel estimation value corresponding to each channel estimation value and a noise power estimation value;
and taking the product of the channel compensation value and the first PBCH _ DMRS frequency domain signal as a second PBCH _ DMRS frequency domain signal after channel equalization.
In a possible implementation, the processing unit is specifically configured to:
matching the second PBCH _ DMRS frequency domain signal with a plurality of groups of preset PBCH _ DMRS frequency domain signals, wherein the preset PBCH _ DMRS frequency domain signals are PBCH _ DMRS frequency domain signals generated by the device according to a second preset rule;
and determining the sequence number of the group corresponding to the maximum value in the matching result as the index number of the second PBCH _ DMRS in the synchronization information block.
In a third aspect, an embodiment of the present invention provides a device for detecting a broadcast channel demodulation reference signal PBCH _ DMRS, including: at least one processor, at least one memory and computer program instructions stored in the memory, which when executed by the processor, implement a method of broadcast channel demodulation reference signal, PBCH DMRS, detection as defined in any one of the first aspect of embodiments of the invention.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which computer program instructions are stored, which, when executed by a processor, implement the method for detecting a PBCH _ DMRS according to any one of the first aspect of the embodiments of the present invention.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
fig. 1 is a schematic diagram of time domain distribution of a synchronization information block according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of receiving and demodulating synchronization information block information provided by the prior art;
fig. 3 is a schematic flowchart of a synchronization information block information receiving demodulation according to an embodiment of the present invention;
fig. 4 is a schematic diagram of error detection rates of PBCH _ DMRS in different algorithms according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a PBCH _ DMRS detection method according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a PBCH _ DMRS detection apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a PBCH _ DMRS detection device according to an embodiment of the present invention.
Detailed Description
In view of the fact that in the prior art, when the PBCH _ DMRS is detected, the influence of channel fading, frequency offset and noise is not considered, and the accuracy of detection cannot be guaranteed, an embodiment of the present invention provides a detection scheme for a demodulation reference signal PBCH _ DMRS of a broadcast channel, so as to implement compensation of an error caused by frequency offset in a detection process of a frequency domain signal of the PBCH _ DMRS, and also implement corresponding compensation of the influence of channel fading and noise on the frequency domain signal of the PBCH _ DMRS in a transmission process, thereby implementing improvement of detection accuracy.
Fig. 3 is a schematic flow chart illustrating a method for detecting a demodulation reference signal PBCH _ DMRS of a broadcast channel, and as can be seen from a generation manner of a PBCH _ DMRS frequency domain signal in a 5G NR system, it is necessary to match the received PBCH _ DMRS frequency domain signal with a preset PBCH _ DMRS signal, and in an actual communication process, due to integrity of a received signal, both channel fading and noise influence may cause a distortion phenomenon of the received signal, thereby affecting accuracy of detection. For the above situation, as shown in fig. 3, an embodiment of the present invention provides a method for detecting a broadcast channel demodulation reference signal PBCH _ DMRS, and in order to ensure the integrity of a signal processing process, the embodiments of the present invention list the steps of PSS blind detection, PSS frequency offset estimation, SSS blind detection, and the like.
Further, as shown in fig. 1, the SSB structure of a complete 5G NR communication system occupies 20 RBs (Resource Block ), where 1 RB is composed of 12 REs (Resource Element), the time domain occupies 4 symbols, and the cell ID is 0. In specific implementation, the method for detecting PBCH _ DMRS provided in the embodiment of the present invention may be divided into four steps, i.e., SSS channel estimation, noise estimation, MMSE equalization, and PBCH _ DMRS detection, which are described in detail below.
The method comprises the following steps: SSS channel estimation
S1: a frequency domain signal in a synchronization information block is received, including a first SSS.
S2: and performing division operation on the first SSS and a preset second SSS to determine SSS channel estimation information.
Note that, the preset second SSS is a locally generated standard secondary synchronization signal.
Further, the SSS and the PBCH _ DMRS are partially overlapped in the frequency domain and only differ by 1 symbol in the time domain, so the SSS and the overlapped PBCH _ DMRS may be considered to experience the same channel fading, and thus may be compensated by using the channel information obtained by the SSS.
In specific implementation, first, the received first SSS is defined as R SSS (k,2), where k denotes the number of REs, i.e., the kth subcarrier, and k ∈ {56,57,58, …,182 }; 2 denotes the 2 nd symbol, and the symbol index starts from 0. Then, a preset second SSS is defined as R SSS_local (m) and m ∈ {0,1,2, …,126}, where m is the number of subcarriers occupied by the preset second SSS. Finally, the SSS channel estimate is determined by equation 1:
further, considering that the SSS is an m-sequence, that is, takes values of only 1 or-1, a multiplication operation may be used instead of a division operation to improve operation efficiency, and therefore, the SSS channel estimation value may be determined by formula 2:
H(k)＝R SSS (k,2)·R SSS_local (k-56),k∈{56,57,...,182 equation 2
Step two: noise estimation
As can be seen from the synchronization information block shown in fig. 1, no data is transmitted in some subcarriers, i.e., null subcarriers, so that the subcarriers can be used to estimate noise.
In particular, the received noise frequency domain signal may be defined as R noise (k, l), where k denotes the number of RE, l denotes a symbol index value, and the following condition is satisfied:
when l is 0, k ∈ {0, 1., 55,183,184., 239}
When l is 2, k ∈ {49, 50.., 55,183,184.,. 191}
Further, the noise power estimate is determined by equation 3:
P noise ＝mean(|R noise (k,l)| 2 ) Equation 3
Step three: MMSE equalization
The step is mainly to carry out channel compensation on PBCH _ DMRS by utilizing a channel estimation value obtained by an SSS channel estimation module and a noise power estimation value obtained by a noise estimation module, and the compensation method comprises the following steps:
s1: obtaining PBCH DMRS signals overlapped with SSS on frequency domain according to current cell ID, and defining the overlapped PBCH DMRS signals as R PBCH_DMRS (k, l), where k denotes the number of RE, l denotes a symbol index value, and the following condition is satisfied:
l∈{1,3}
s2: channel equalization is performed by the MMSE method.
In specific implementation, H (k) can be obtained through an SSS channel estimation module, k is formed by {56,57,58, …,182}, and P can be obtained through a noise estimation module noise Then the channel equalization result can be represented by equation 4:
wherein the content of the first and second substances,
the PBCH _ DMRS frequency domain data after the channel equalization is completed.
Step four: PBCH DMRS detection
S1: using PBCH DMRS frequency domain data after channel equalization, i.e.
And carrying out conjugate multiplication operation with 8 sets of standard data generated locally.
S2: and finding the group number of the group corresponding to the maximum correlation value in the 8 groups of operation results of the S1, and taking the group number as the index number defined by the protocol.
In specific implementation, the index number defined by the protocol is calculated by formula 5:
further, the index number is used for carrying out channel estimation on the PBCH _ DMRS frequency domain data after the channel equalization is finished, and the PBCH (physical broadcast channel) is demodulated according to the channel estimation so as to acquire the information in the main information block of the synchronization information block.
Further, in order to embody the advantage of the algorithm proposed in the embodiment of the present invention in detecting the accuracy of the PBCH _ DMRS, simulation comparison is now performed, and the system parameter settings are shown in table 1:
TABLE 1
As shown in fig. 4, the comparison result of the error detection rates of PBCH _ DMRS of different algorithms under the same system configuration and channel condition is shown. As can be seen from fig. 4, firstly, the error detection rate of the two algorithms is continuously decreased with the increase of the signal-to-noise ratio, which means that the higher the signal-to-noise ratio is, the less error detection is generated; secondly, comparing the corresponding signal-to-noise ratios with the same error detection rate, for example, the error detection rate is 10%, the signal-to-noise ratio of the algorithm provided in the embodiment of the present invention is lower by more than 1dB, and the signal-to-noise ratio corresponding to the error detection rate of 5% is lower by about 2dB, that is, the algorithm provided in the embodiment of the present invention can reach the same error detection rate under the condition of lower signal-to-noise ratio, so that the good performance of the algorithm is reflected.
It should be noted that the PBCH _ DMRS detection method provided in the embodiment of the present invention is not only applicable to a 5G NR communication system, but also applicable to various wireless communication systems requiring pilot detection, so as to improve detection accuracy.
Further, the PBCH _ DMRS detection method provided in the embodiment of the present invention is implemented specifically, and has the following points:
(1) the method has strong universality and good portability, and is suitable for wireless communication systems which need pilot frequency detection;
(2) the compatibility is good, the compatibility is compatible to different system bandwidths, and the insensitivity to the number of users is realized;
(3) the complexity is low, complex operations such as evolution, root number solving and the like are not needed, and the method is easy to realize.
As shown in fig. 5, an embodiment of the present invention provides a method for detecting a broadcast channel demodulation reference signal PBCH _ DMRS, which is applied to a terminal device, and includes:
And step 504, determining the index number of the synchronization information block according to the second PBCH _ DMRS frequency domain signal, and performing channel estimation on the second PBCH _ DMRS frequency domain signal by using the index number.
In one possible embodiment, the first secondary synchronization signal occupies at least one subcarrier;
determining at least one channel estimation value according to the first secondary synchronization signal and a preset second secondary synchronization signal, comprising:
and aiming at any subcarrier occupied by the first auxiliary synchronization signal, calculating the first auxiliary synchronization signal borne on the subcarrier and a second auxiliary synchronization signal corresponding to the subcarrier to obtain a channel estimation value corresponding to the subcarrier.
In one possible embodiment, the noise frequency domain signal occupies at least one null subcarrier;
determining a noise power estimation value according to the noise frequency domain signal, comprising: and taking the mean value of the squared noise frequency domain signals on at least one null subcarrier as a noise power estimation value corresponding to the noise frequency domain signals.
In one possible embodiment, the first secondary synchronization signal occupies a first frequency domain interval and the noise frequency domain signal occupies a second frequency domain interval, wherein the first frequency domain interval and the second frequency domain interval constitute a frequency domain interval of the synchronization information block.
In one possible implementation, the channel equalization is performed on the first PBCH _ DMRS frequency domain signal based on the at least one channel estimation value and the noise power estimation value, and the determination of the second PBCH _ DMRS frequency domain signal after the channel equalization includes:
determining a conjugate channel estimation value corresponding to each channel estimation value according to at least one channel estimation value;
determining a channel compensation value of the synchronization information block based on at least one channel estimation value, a conjugate channel estimation value corresponding to each channel estimation value and a noise power estimation value;
and taking the product of the channel compensation value and the first PBCH _ DMRS frequency domain signal as a second PBCH _ DMRS frequency domain signal after channel equalization.
In one possible implementation, determining the index number of the synchronization information block according to the second PBCH _ DMRS frequency domain signal includes:
matching the second PBCH _ DMRS frequency domain signal with a plurality of groups of preset PBCH _ DMRS frequency domain signals, wherein the preset PBCH _ DMRS frequency domain signals are PBCH _ DMRS frequency domain signals generated by the terminal equipment according to a second preset rule;
and determining the sequence number of the group corresponding to the maximum value in the matching result as the index number of the second PBCH _ DMRS in the synchronization information block.
As shown in fig. 6, an embodiment of the present invention further provides a device for detecting a PBCH _ DMRS in a broadcast channel demodulation reference signal, including:
a receiving unit 61, configured to receive frequency domain signals in the synchronization information block, where the frequency domain signals include a first secondary synchronization signal, a noise frequency domain signal, and a first PBCH _ DMRS frequency domain signal, where the first PBCH _ DMRS frequency domain signal is a PBCH _ DMRS signal that overlaps with the first secondary synchronization signal in a frequency domain.
A first determining unit 62, configured to determine at least one channel estimation value according to the first secondary synchronization signal and a preset second secondary synchronization signal, and determine a noise power estimation value according to the noise frequency domain signal, where the preset second secondary synchronization signal is the secondary synchronization signal generated by the apparatus according to the first preset rule.
A second determining unit 63, configured to perform channel equalization on the first PBCH _ DMRS frequency domain signal based on at least one channel estimation value and the noise power estimation value, and determine a second PBCH _ DMRS frequency domain signal after the channel equalization.
And a processing unit 64, configured to determine an index of the synchronization information block according to the second PBCH _ DMRS frequency domain signal, and perform channel estimation on the second PBCH _ DMRS frequency domain signal by using the index.
In one possible embodiment, the first secondary synchronization signal occupies at least one subcarrier;
the first determining unit 62 is specifically configured to:
and aiming at any subcarrier occupied by the first auxiliary synchronization signal, calculating the first auxiliary synchronization signal borne on the subcarrier and a second auxiliary synchronization signal corresponding to the subcarrier to obtain a channel estimation value corresponding to the subcarrier.
In one possible embodiment, the noise frequency domain signal occupies at least one null subcarrier;
the first determining unit 62 is further specifically configured to:
and taking the mean value of the squared noise frequency domain signals on at least one null subcarrier as a noise power estimation value corresponding to the noise frequency domain signals.
In one possible embodiment, the first secondary synchronization signal occupies a first frequency domain interval and the noise frequency domain signal occupies a second frequency domain interval, wherein the first frequency domain interval and the second frequency domain interval constitute a frequency domain interval of the synchronization information block.
In a possible implementation, the second determining unit 63 is specifically configured to:
determining a conjugate channel estimation value corresponding to each channel estimation value according to at least one channel estimation value;
determining a channel compensation value of the synchronization information block based on at least one channel estimation value, a conjugate channel estimation value corresponding to each channel estimation value and a noise power estimation value;
and taking the product of the channel compensation value and the first PBCH _ DMRS frequency domain signal as a second PBCH _ DMRS frequency domain signal after channel equalization.
In a possible implementation, the processing unit 64 is specifically configured to:
matching the second PBCH _ DMRS frequency domain signal with a plurality of groups of preset PBCH _ DMRS frequency domain signals, wherein the preset PBCH _ DMRS frequency domain signals are PBCH _ DMRS frequency domain signals generated by the device according to a second preset rule;
and determining the sequence number of the group corresponding to the maximum value in the matching result as the index number of the second PBCH _ DMRS in the synchronization information block.
As shown in fig. 7, an embodiment of the present invention further provides a broadcast channel demodulation reference signal PBCH _ DMRS detection device 70, including:
at least one processor 71, at least one memory 72, and computer program instructions stored in the memory, when executed by the processor 71, to implement the broadcast channel demodulation reference signal PBCH DMRS detection method provided in an embodiment of the invention.
In an exemplary embodiment, a storage medium comprising instructions, such as a memory 72 comprising instructions, executable by a processor 71 of a detection device for intrusion behavior is also provided to perform the above-described method.
Alternatively, the storage medium may be a non-transitory computer readable storage medium, for example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method for detecting a broadcast channel demodulation reference signal (PBCH _ DMRS) is applied to terminal equipment, and is characterized in that the method comprises the following steps:
receiving frequency domain signals in a synchronization information block, wherein the frequency domain signals comprise a first secondary synchronization signal, a noise frequency domain signal and a first PBCH _ DMRS frequency domain signal, and the first PBCH _ DMRS frequency domain signal is a PBCH _ DMRS signal which is overlapped with the first secondary synchronization signal on a frequency domain;
determining at least one channel estimation value according to the first auxiliary synchronization signal and a preset second auxiliary synchronization signal, and determining a noise power estimation value according to the noise frequency domain signal, wherein the preset second auxiliary synchronization signal is an auxiliary synchronization signal generated by the terminal equipment according to a first preset rule;
performing channel equalization on the first PBCH _ DMRS frequency domain signal based on the at least one channel estimation value and the noise power estimation value, and determining a second PBCH _ DMRS frequency domain signal after the channel equalization;
and determining the index number of the synchronization information block according to the second PBCH _ DMRS frequency domain signal, and performing channel estimation on the second PBCH _ DMRS frequency domain signal by using the index number.
2. The method of claim 1, wherein the first secondary synchronization signal occupies at least one subcarrier;
the determining at least one channel estimation value according to the first secondary synchronization signal and a preset second secondary synchronization signal includes:
and aiming at any subcarrier occupied by the first auxiliary synchronization signal, calculating the first auxiliary synchronization signal borne on the subcarrier and the second auxiliary synchronization signal corresponding to the subcarrier to obtain a channel estimation value corresponding to the subcarrier.
3. The method of claim 1, wherein the noise frequency domain signal occupies at least one null subcarrier;
the determining a noise power estimation value according to the noise frequency domain signal includes: and taking the mean value of the squared noise frequency domain signals on the at least one empty subcarrier as a noise power estimation value corresponding to the noise frequency domain signals.
4. The method of claim 1, comprising:
the first auxiliary synchronization signal occupies a first frequency domain interval, and the noise frequency domain signal occupies a second frequency domain interval, wherein the first frequency domain interval and the second frequency domain interval constitute a frequency domain interval of the synchronization information block.
5. The method of any of claims 1-4, wherein the channel equalizing the first PBCH DMRS frequency-domain signal based on the at least one channel estimate and the noise power estimate, and determining a channel equalized second PBCH DMRS frequency-domain signal comprises:
determining a conjugate channel estimation value corresponding to each channel estimation value according to the at least one channel estimation value;
determining a channel compensation value of the synchronization information block based on the at least one channel estimation value, a conjugate channel estimation value corresponding to each channel estimation value and the noise power estimation value;
and taking the product of the channel compensation value and the first PBCH _ DMRS frequency domain signal as a second PBCH _ DMRS frequency domain signal after the channel equalization.
6. The method of claim 1, wherein the determining the index number of the synchronization information block from the second PBCH DMRS frequency domain signal comprises:
matching the second PBCH _ DMRS frequency domain signal with a plurality of groups of preset PBCH _ DMRS frequency domain signals, wherein the preset PBCH _ DMRS frequency domain signals are PBCH _ DMRS frequency domain signals generated by the terminal equipment according to a second preset rule;
and determining the sequence number of the group corresponding to the maximum value in the matching result as the index number of the second PBCH _ DMRS in the synchronization information block.
7. An apparatus for detecting a broadcast channel demodulation reference signal (PBCH _ DMRS), the apparatus comprising:
a receiving unit, configured to receive a frequency domain signal in a synchronization information block, where the frequency domain signal includes a first secondary synchronization signal, a noise frequency domain signal, and a first PBCH _ DMRS frequency domain signal, where the first PBCH _ DMRS frequency domain signal is a PBCH _ DMRS signal that overlaps with the first secondary synchronization signal in a frequency domain;
a first determining unit, configured to determine at least one channel estimation value according to the first auxiliary synchronization signal and a preset second auxiliary synchronization signal, and determine a noise power estimation value according to the noise frequency domain signal, where the preset second auxiliary synchronization signal is an auxiliary synchronization signal generated by the apparatus according to a preset rule;
a second determining unit, configured to perform channel equalization on the first PBCH _ DMRS frequency domain signal based on the at least one channel estimation value and the noise power estimation value, and determine a second PBCH _ DMRS frequency domain signal after the channel equalization;
and the processing unit is used for determining the index number of the synchronization information block according to the second PBCH _ DMRS frequency domain signal and performing channel estimation on the second PBCH _ DMRS frequency domain signal by using the index number.
8. The apparatus of claim 7, wherein the first secondary synchronization signal occupies at least one subcarrier;
the first determining unit is specifically configured to:
and aiming at any subcarrier occupied by the first auxiliary synchronization signal, calculating the first auxiliary synchronization signal borne on the subcarrier and the second auxiliary synchronization signal corresponding to the subcarrier to obtain a channel estimation value corresponding to the subcarrier.
9. A broadcast channel demodulation reference signal, PBCH DMRS, detection device, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, which when executed by the processor, implement the broadcast channel demodulation reference signal, PBCH DMRS, detection method of any of claims 1-6.
10. A computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the broadcast channel demodulation reference signal, PBCH DMRS, detection method as claimed in any one of claims 1-6.
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| CN114598573B (en) * | 2022-03-02 | 2023-11-03 | 国网信息通信产业集团有限公司 | Method and device for estimating energy ratio of each resource element |
| CN117439842A (en) * | 2022-07-14 | 2024-01-23 | 锐捷网络股份有限公司 | Method, equipment and storage medium for estimating noise power |
| CN115567357A (en) * | 2022-09-09 | 2023-01-03 | 京信网络系统股份有限公司 | Time-frequency synchronization method, device, equipment, storage medium and program product |
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