CN109474984B - Method and device for detecting master synchronizing signal, user terminal and readable storage medium - Google Patents
Method and device for detecting master synchronizing signal, user terminal and readable storage medium Download PDFInfo
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Abstract
A method and device for detecting a primary synchronization signal, a user terminal and a readable storage medium are provided, wherein the detection method comprises the following steps: selecting a partial PSS sequence from the local full-bandwidth PSS sequence; determining the sampling rate of the received signal according to the bandwidth, the subcarrier interval and the oversampling factor of the partial PSS sequence; generating a local time domain PSS signal according to the bandwidth of the partial PSS sequence, the subcarrier interval and the sampling rate of the received signal; low-pass filtering the received signal, and down-sampling the received signal after low-pass filtering according to the sampling rate of the received signal; and acquiring timing information and cell identification information in the group according to the local time domain PSS signal and the received signal after down sampling. The scheme can reduce the complexity and power consumption of the initial PSS detection.
Description
Technical Field
The present invention relates to the field of wireless communications, and in particular, to a method and an apparatus for detecting a primary synchronization signal, a user terminal, and a readable storage medium.
Background
In the LTE system, a Primary Synchronization Signal (PSS) has a bandwidth of 63 subcarriers, occupies 6 Physical Resource Blocks (PRBs), has a subcarrier interval of 15kHz, and has a default period for initial PSS detection of 5 ms. In the PSS detection process, in order to reduce the amount of data to be processed, the received signal is first subjected to a low-pass filtering and downsampling process.
In a 5G New Radio (NR) system, the bandwidth of the PSS is 127 subcarriers, occupying 12 PRBs, and the default period for initial PSS detection is 20 ms. There are 4 possibilities for the sub-carrier spacing of PSS, depending on the frequency range: 15kHz, 30kHz, 120kHz and 240 kHz. In the PSS detection process, in order to reduce the amount of data to be processed, the received signal is also first subjected to a low-pass filtering and downsampling process.
In the 5G NR system and the LTE system, the bandwidth, the subcarrier interval and the initial default period of the PSS are different, and the requirements for low-pass filtering and down-sampling in the PSS detection process are also different. Compared with the LTE system, in the 5G NR system, the bandwidth of the PSS is increased by 2 times, 4 times, 16 times, and 32 times, respectively, according to different sampling rates, and the default period for initial PSS detection is increased by 4 times. In summary, the data amount detected by the initial PSS is increased by 8 times, 16 times, 64 times and 128 times, respectively.
As can be seen, in the prior art, the data amount of a single initial PSS detection in the 5G NR system is significantly increased, and the complexity and power consumption of the initial PSS detection will be significantly increased.
Disclosure of Invention
The embodiment of the invention solves the problem of reducing the complexity and power consumption of the initial PSS detection.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for detecting a primary synchronization signal, including: selecting a partial PSS sequence from the local full-bandwidth PSS sequence; determining the sampling rate of the received signal according to the bandwidth, the subcarrier interval and the oversampling factor of the partial PSS sequence; generating a local time domain PSS signal according to the bandwidth of the partial PSS sequence, the subcarrier interval and the sampling rate of the received signal; low-pass filtering the received signal, and down-sampling the received signal after low-pass filtering according to the sampling rate of the received signal; and acquiring timing information and cell identification information in the group according to the local time domain PSS signal and the received signal after down sampling.
Optionally, the selecting a partial PSS sequence from the local full bandwidth PSS sequence includes: and selecting the partial PSS sequence from the local full-bandwidth PSS sequence by taking the frequency domain center position of the local full-bandwidth PSS sequence as a midpoint.
Optionally, the selecting the PSS sequence with the partial bandwidth by using the frequency domain center position of the local full-bandwidth PSS sequence as a midpoint includes: taking the frequency domain center position of the local full-bandwidth PSS sequence as a midpoint, symmetrically selecting the PSS sequence on two sides of the midpoint to be used as a selected partial PSS sequence; the selected partial PSS sequence comprises an integer number of subcarriers.
Optionally, the low-pass filtering the received signal includes: determining the type of a low-pass filter according to the sampling rate of the received signal, the bandwidth of the partial PSS sequence and the subcarrier interval; and generating a corresponding low-pass filter according to the determined type of the low-pass filter, and performing low-pass filtering on the received signal by the generated low-pass filter.
Optionally, the downsampling the low-pass filtered received signal includes: determining a down-sampling order according to the sampling rate of the received signal and the sampling rate of the ADC; and according to the down-sampling order, down-sampling the received signal after the low-pass filtering.
Optionally, the determining a down-sampling order according to the sampling rate of the received signal and the sampling rate of the ADC includes: and dividing the sampling rate of the ADC by the sampling rate of the received signal to obtain a quotient value serving as the down-sampling order.
Optionally, the obtaining timing information and intra-group cell identification information according to the local time domain PSS signal and the downsampled received signal includes: performing time domain cross-correlation calculation on the down-sampled received signal and the local time domain PSS signal; performing a modular square operation on a result obtained by the cross-correlation calculation, and performing a normalization operation on the modular square operation of the downsampled received signal; performing multi-antenna combination on the normalization operation result, and performing accumulation of a plurality of search lengths; carrying out peak value search and threshold value detection on the accumulated result; and acquiring the timing information and the identification information of the cells in the group according to the detected peak value.
Optionally, the method for detecting a primary synchronization signal further includes: and determining a frequency offset estimation value from the plurality of frequency offset trial values according to the local time domain PSS signal, the downsampled received signal and a plurality of preset frequency offset trial values.
Optionally, the determining a frequency offset estimation value from the multiple frequency offset attempt values includes: and acquiring peak values corresponding to the multiple frequency deviation attempted values, and selecting the frequency deviation attempted value with the largest peak value as the frequency deviation estimated value.
Optionally, after acquiring the timing information and the intra-group cell identification information, the method further includes: and calibrating the timing information and the intra-group cell identification information according to the local full-bandwidth PSS sequence.
Optionally, the calibrating the timing information and the intra-group cell identification information according to the local full bandwidth PSS sequence includes: selecting a preset duration interval by taking the time point corresponding to the timing information as a central point; and performing PSS detection on the received signals after down sampling in the preset duration interval by adopting the local full-bandwidth PSS sequence so as to calibrate the timing information and the cell identification information in the group.
Optionally, the generating the local time domain PSS signal includes: respectively complementing 0 with the same number on the left side and the right side of the partial PSS sequence, so that the length of the partial PSS sequence after 0 complementation is equal to the quotient of the sampling rate of the received signal and the subcarrier interval; and converting the partial PSS sequence after 0 complementing into a local time domain PSS signal.
The embodiment of the present invention further provides a device for detecting a primary synchronization signal, including: the selection unit is used for selecting a part of PSS sequences from the local full-bandwidth PSS sequences; a determining unit, configured to determine a sampling rate of a received signal according to a bandwidth of the partial PSS sequence, a subcarrier spacing, and an oversampling factor; a generating unit, configured to generate a local time domain PSS signal according to a bandwidth of the partial PSS sequence, a subcarrier interval, and a sampling rate of the received signal; a low-pass filtering unit for low-pass filtering the received signal; a down-sampling unit for down-sampling the low-pass filtered received signal; and the acquisition unit is used for acquiring timing information and cell identification information in the group according to the local time domain PSS signal and the received signal after down sampling.
Optionally, the selecting unit is configured to select the partial PSS sequence from the local full-bandwidth PSS sequence with a frequency domain center position of the local full-bandwidth PSS sequence as a midpoint.
Optionally, the selecting unit is configured to symmetrically select the PSS sequence on two sides of a midpoint, where a frequency domain center position of the local full-bandwidth PSS sequence is taken as the midpoint, and the selected PSS sequence is taken as a selected partial PSS sequence; the selected partial PSS sequence comprises an integer number of subcarriers.
Optionally, the low-pass filtering unit is configured to determine a type of a low-pass filter according to a sampling rate of the received signal, a bandwidth of the partial PSS sequence, and the subcarrier spacing; and generating a corresponding low-pass filter according to the determined type of the low-pass filter, and performing low-pass filtering on the received signal by the generated low-pass filter.
Optionally, the down-sampling unit is configured to determine a down-sampling order according to a sampling rate of the received signal and a sampling rate of the ADC; and according to the down-sampling order, down-sampling the received signal after the low-pass filtering.
Optionally, the down-sampling unit is configured to divide the sampling rate of the ADC by the sampling rate of the received signal, and obtain a quotient as the down-sampling order.
Optionally, the obtaining unit is configured to perform time domain cross-correlation calculation on the downsampled received signal and the local time domain PSS signal; performing a modular square operation on a result obtained by the cross-correlation calculation, and performing a normalization operation on the modular square operation of the downsampled received signal; performing multi-antenna combination on the normalization operation result, and performing accumulation of a plurality of search lengths; carrying out peak value search and threshold value detection on the accumulated result; and acquiring the timing information and the identification information of the cells in the group according to the detected peak value.
Optionally, the primary synchronization signal detecting apparatus further includes: and the frequency offset estimation value determining unit is used for determining a frequency offset estimation value from the plurality of frequency offset trial values according to the local time domain PSS signal, the downsampled received signal and a plurality of preset frequency offset trial values.
Optionally, the frequency offset estimation value determining unit is configured to obtain peak values corresponding to the multiple frequency offset attempt values, and select a frequency offset attempt value with a largest peak value as the frequency offset estimation value.
Optionally, the primary synchronization signal detecting apparatus further includes: and the correcting unit is used for correcting the timing information and the intra-group cell identification information according to the local full-bandwidth PSS sequence.
Optionally, the correcting unit is configured to select a preset duration interval with a time point corresponding to the timing information as a central point; and performing PSS detection on the received signals after down sampling in the preset duration interval by adopting the local full-bandwidth PSS sequence so as to calibrate the timing information and the cell identification information in the group.
Optionally, the generating unit is configured to complement 0 s with the same number on the left and right sides of the partial PSS sequence, so that the length of the partial PSS sequence after being complemented by 0 is equal to a quotient of the sampling rate of the received signal and the subcarrier interval; and converting the partial PSS sequence after 0 complementing into a local time domain PSS signal.
The embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method performs any of the steps of the primary synchronization signal detection method.
The embodiment of the invention also provides a user terminal, which comprises a memory and a processor, wherein the memory is stored with computer instructions, and the computer instructions execute the steps of any one of the above-mentioned main synchronization signal detection methods when running.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
and when the primary synchronization signal is detected, selecting a partial PSS sequence from the local full-bandwidth PSS sequence, and generating a local time domain PSS signal according to the selected partial PSS sequence. And acquiring timing information and cell identification information in the group according to the generated local time domain PSS signal and the downsampled received signal, thereby completing the detection of the main synchronization signal. Because the local time domain PSS signal is generated by adopting a partial PSS sequence instead of the local full-bandwidth PSS sequence, the calculation complexity of the detection of the main synchronization signal can be effectively reduced.
Further, a local time domain PSS signal is generated according to a part of the PSS sequence, and timing information and intra-group cell identification information are obtained according to the generated local time domain PSS signal and the received signal after down sampling. And then, calibrating the acquired timing information and the intra-group cell identification information through the local full-bandwidth PSS sequence, thereby reducing the detection of the primary synchronization signal and ensuring the detection precision of the primary synchronization signal.
Drawings
Fig. 1 is a flowchart of a primary synchronization signal detection method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a primary synchronization signal detection apparatus in an embodiment of the present invention.
Detailed Description
According to the bandwidth, the subcarrier interval and the initial default period of the PSS, referring to table 1, requirements of the sampling rate and the number of samples for PSS detection in the LTE system and the 5G NR system in the prior art are given.
TABLE 1
As can be seen from table 1, in the 5G NR system, the bandwidth of the PSS is increased by 2 times, 4 times, 16 times, and 32 times, respectively, and the default period for initial PSS detection is increased by 4 times, according to different sampling rates, compared to the LTE system. In summary, the data amount detected by the initial PSS is increased by 8 times, 16 times, 64 times and 128 times, respectively. It follows that the amount of data detected by a single initial PSS increases significantly. Accordingly, in the 5G NR system, the complexity and power consumption of the initial PSS detection will increase significantly.
In the embodiment of the invention, when the primary synchronization signal is detected, a partial PSS sequence is selected from the local full-bandwidth PSS sequence, and the local time domain PSS signal is generated according to the selected partial PSS sequence. Because the local time domain PSS signal is generated by adopting a partial PSS sequence instead of the local full-bandwidth PSS sequence, the calculation complexity of the detection of the main synchronization signal can be effectively reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
An embodiment of the present invention provides a method for detecting a primary synchronization signal, which is described in detail below with reference to fig. 1 through specific steps.
Step S101, selecting a partial PSS sequence from the local full bandwidth PSS sequence.
In a specific implementation, the local full bandwidth PSS sequence may be a pre-stored full bandwidth PSS sequence. The number of local full bandwidth PSS sequences may be 3, or may be 2 or 1.
In a specific implementation, when the partial PSS sequence is selected from the local full-bandwidth PSS sequence, the partial PSS sequence may be selected with a center position of the frequency domain of the local full-bandwidth PSS sequence as a midpoint. In the embodiment of the present invention, the PSS sequence may be symmetrically selected on both sides of the frequency center position of the local full-bandwidth PSS sequence as the selected PSS sequence.
In the embodiment of the present invention, the bandwidth of the selected partial PSS sequence may include an integer number of Physical Resource Blocks (PRBs), or may include a non-integer number of PRBs. It should be noted that the bandwidth of the selected partial PSS sequence may include an integer number of subcarriers.
For example, the bandwidth of the local full bandwidth PSS sequence is 12 PRBs, and the bandwidth of the selected partial PSS sequence is 6 PRBs. The 6 PRBs are continuous 6 PRBs, and the central frequency points of the 6 PRBs are the same as the central frequency points of the local full-bandwidth PSS sequence.
For another example, the bandwidth of the local full-bandwidth PSS sequence is 12 PRBs, and the bandwidth of the selected partial PSS sequence is 4 PRBs. The 4 PRBs are continuous 4 PRBs, and the central frequency points of the 4 PRBs are the same as the central frequency points of the local full-bandwidth PSS sequence.
For another example, the bandwidth of the local full-bandwidth PSS sequence is 12 PRBs, and the bandwidth of the selected partial PSS sequence is 2.5 PRBs. In the 5G NR system, one PRB is defined to occupy 12 subcarriers in the frequency domain, so 2.5 PRBs occupy 30 subcarriers, and 30 subcarriers are continuous in the frequency domain and the corresponding center frequency point is the same as the center frequency point of the local full-bandwidth PSS sequence.
It can be understood that, in other embodiments of the present invention, when selecting the partial PSS sequence from the local full-bandwidth PSS sequence, the partial PSS sequence may also be selected from other positions in the local full-bandwidth PSS sequence as long as the bandwidth of the selected partial PSS sequence occupies an integer number of subcarriers.
In addition, the bandwidth of the selected partial PSS sequence may also be selected according to the actual application scenario, for example, the bandwidth of the selected partial PSS sequence is 6 PRBs or 4 PRBs.
Step S102, according to the bandwidth, the subcarrier interval and the oversampling factor of the PSS sequence, determining the sampling rate of the received signal.
In a specific implementation, the subcarrier spacing may be 15KHz, 30KHz, 120KHz, or 240KHz for a 5G NR system. The oversampling factor can be set according to a specific application scenario, for example, the oversampling factor is set to 2.
Step S103, according to the bandwidth of the partial PSS sequence, the subcarrier interval and the sampling rate of the received signal, a local time domain PSS signal is generated.
In a specific implementation, the local time domain PSS signal may be generated according to the bandwidth of the partial PSS sequence selected in step S101, the sampling rate of the received signal determined in step S102, and the subcarrier spacing.
Compared with the prior art, the local time domain PSS signal generated by the embodiment of the invention is generated according to the partial PSS sequence, but not generated by adopting the local full-bandwidth PSS sequence.
In specific implementation, when generating the local time domain PSS signal, the left and right sides of the partial PSS sequence may be supplemented with 0 of the same number, respectively, so that the length of the partial PSS sequence after completing 0 supplementation reaches the following value: the quotient of the sampling rate of the received signal and the subcarrier spacing. Then, the partial PSS sequence after 0 padding is converted into a local time domain PSS signal.
For example, if the length of the partial PSS sequence is 72 subcarriers, the sampling rate of the received signal is 1.92MS/s, and the subcarrier interval is 15KHz, the partial PSS sequence with the length of 72 is first supplemented with 0 to 128, and then the partial PSS sequence with the length of 128 is converted into the local time domain PSS signal.
When 0 is complemented for the length 72 partial PSS sequence, 28 0's are complemented on the left side of the length 72 partial PSS sequence, and 28 0's are complemented on the right side as well.
Step S104, low-pass filtering the received signal.
In a specific implementation, after receiving the received signal, the receiver may perform low-pass filtering on the received signal.
In the embodiment of the present invention, the type of the low pass filter may be determined according to the sampling rate of the received signal, the bandwidth of the partial PSS sequence, and the subcarrier spacing. After determining the type of the low-pass filter, the receiver may generate a low-pass filter corresponding thereto, and perform low-pass filtering processing on the received signal using the generated low-pass filter.
Step S105, down-sampling the low-pass filtered received signal according to the sampling rate of the received signal.
In a specific implementation, the receiver may down-sample the received signal after the low-pass filtering process according to a sampling rate of the received signal. When down-sampling the received signal after the low-pass filter process, the down-sampling order may be determined according to a sampling rate of an Analog-to-Digital Converter (ADC) and a sampling rate of the received signal.
In practical applications, it is known that, in signal reception, a received signal received by a receiver exists in an analog signal format. After receiving the reception signal in the analog signal format, the receiver performs analog-to-digital conversion on the reception signal in the analog signal format by using the ADC, thereby converting the reception signal in the analog signal format into the reception signal in the digital signal format.
In a specific implementation, the order of the downsampling may be: the quotient of the sampling rate of the ADC and the sampling rate of the received signal. For example, if the sampling rate of the ADC is 122.88MS/s and the sampling rate of the received signal is 7.68MS/s, the order of the down-sampling is: 122.88/7.68 ═ 16.
After the down-sampling order of the received signal is determined, the down-sampling process may be performed on the received signal after the low-pass filtering process.
In a specific implementation, there is no strict logical order between steps S101 to S103 and steps S104 to S105, and steps S101 to S103, steps S104 to S105, or steps S104 to S105 and steps S101 to S103 may be executed first.
And step S106, acquiring timing information and intra-group cell identification information according to the local time domain PSS signal and the received signal after down sampling.
In a specific implementation, after the local time domain PSS signal and the down-sampled received signal are obtained, time domain cross-correlation calculation may be performed on the local time domain PSS signal and the down-sampled received signal, and the time domain cross-correlation calculation may be implemented by a frequency domain method.
After the cross-correlation result is obtained through calculation, a modulo square operation may be performed on the cross-correlation result, and the obtained modulo square operation result and a modulo square of the down-sampled received signal may be normalized. And combining the normalization results obtained by the normalization operation by multiple antennas, and accumulating the search lengths. Performing peak value search and threshold value detection on the accumulated result, and acquiring timing information according to the detected peak value
And intra-group cell identification information
In the prior art, the primary synchronization signal detection method is performed based on the local full-bandwidth PSS sequence, and in the embodiment of the present invention, a partial PSS sequence is selected from the local full-bandwidth PSS sequence, so that the primary synchronization signal detection method provided in the embodiment of the present invention can effectively reduce the complexity of primary synchronization signal detection.
In a specific implementation, in step S106, a plurality of preset frequency offset attempt values may be loaded on the local time domain PSS signal or the down-sampled received signal in combination with the frequency offset estimation. And selecting one of the preset frequency offset trial values as a frequency offset estimation value by acquiring the detected peak values corresponding to the preset frequency offset trial values.
In other words, when step S106 is executed, multiple preset frequency offset attempt values may be loaded onto the local time domain PSS signal or the received signal after down-sampling, and the frequency offset estimation value may be obtained while the timing information and the intra-group cell identification information are obtained.
In a specific implementation, detected peaks corresponding to a plurality of frequency offset attempt values may be obtained, and a frequency offset attempt value with a largest peak may be selected as the frequency offset estimation value. It is understood that, in other embodiments of the present invention, other methods may be adopted to select the frequency offset estimation value from the multiple frequency offset trial values, which are not described herein again.
In specific implementation, by using the primary synchronization signal detection method provided in the above embodiment of the present invention, although the complexity of primary synchronization signal detection can be greatly reduced, there may be a problem that the accuracy of the acquired timing information and the intra-group cell identification information is low.
In order to reduce the complexity of detecting the primary synchronization signal and obtain timing information and intra-group cell identification information with higher accuracy, in the embodiment of the present invention, the timing information and the intra-group cell identification information obtained in step S106 may be corrected according to the local full-bandwidth PSS sequence.
In a specific implementation, after the timing information is obtained in step S106, a preset duration interval may be selected by using a time point corresponding to the timing information as a central point. And performing full-bandwidth PSS detection on the downsampled received signal within a preset time interval by adopting a local full-bandwidth PSS sequence so as to calibrate timing information and cell identification information in the group.
In practical applications, the basic flow of full bandwidth PSS detection may include the following steps: the received signal is processed by low-pass filtering and down-sampling, and the down-sampled received signal is output; generating a local time domain PSS signal according to the sampling rate of the down-sampled received signal and the local full-bandwidth PSS sequence; performing time domain cross-correlation calculation on the local time domain PSS signal and the downsampled received signal, and performing normalization operation on the square of a cross-correlation calculation result and the square of a downsampled received signal; performing multi-antenna combination on the normalization result and accumulating a plurality of search lengths; and performing peak value search and threshold value detection on the accumulated result, and outputting timing information and cell identification information in the group according to the detected peak value.
Comparing the basic procedure of the full-bandwidth PSS detection with the primary synchronization signal detection method provided in the above embodiment of the present invention, it can be known that the two are partially identical in operation procedure, and the main difference lies in: in the full-bandwidth PSS detection process, a generated local time domain PSS signal is generated by adopting a local full-bandwidth PSS sequence; in the embodiment of the invention, the generated local time domain PSS signal is generated by adopting the selected partial PSS sequence.
In a specific implementation, if the frequency offset attempt value is loaded on the local time domain PSS signal or the received signal after downsampling in step S106, when the timing information and the intra-group cell identification information are corrected by the full-bandwidth PSS sequence, the frequency offset estimation value may also be corrected.
In a specific implementation, the preset duration interval may be set according to an actual application scenario, and details are not described here.
Therefore, a local time domain PSS signal is generated according to a part of PSS sequence, and timing information and intra-group cell identification information are obtained according to the generated local time domain PSS signal and a received signal after down sampling. And then, calibrating the acquired timing information and the intra-group cell identification information through the local full-bandwidth PSS sequence, thereby reducing the detection of the primary synchronization signal and ensuring the detection precision of the primary synchronization signal.
Referring to fig. 2, an embodiment of the present invention provides a primary synchronization signal detection apparatus, including: an extracting unit 201, a determining unit 202, a generating unit 203, a low-pass filtering unit 204, a down-sampling unit 205, and an obtaining unit 206, wherein:
a selecting unit 201, configured to select a partial PSS sequence from the local full-bandwidth PSS sequence;
a determining unit 202, configured to determine a sampling rate of a received signal according to a bandwidth of the partial PSS sequence, a subcarrier spacing, and an oversampling factor;
a generating unit 203, configured to generate a local time domain PSS signal according to the bandwidth of the partial PSS sequence, the subcarrier interval, and the sampling rate of the received signal;
a low-pass filtering unit 204, configured to perform low-pass filtering on the received signal;
a down-sampling unit 205 for down-sampling the low-pass filtered received signal;
an obtaining unit 206, configured to obtain timing information and intra-group cell identifier information according to the local time domain PSS signal and the received signal after downsampling.
In a specific implementation, the selecting unit 201 may be configured to select the partial PSS sequence from the local full-bandwidth PSS sequence with a frequency domain center position of the local full-bandwidth PSS sequence as a midpoint.
In a specific implementation, the selecting unit 201 may be configured to symmetrically select the PSS sequence on two sides of a midpoint, where the frequency domain center position of the local full-bandwidth PSS sequence is taken as the midpoint, and the PSS sequence is used as the selected partial PSS sequence; the selected partial PSS sequence comprises an integer number of subcarriers.
In a specific implementation, the low-pass filtering unit 204 is configured to determine a type of a low-pass filter according to a sampling rate of the received signal, a bandwidth of the partial PSS sequence, and the subcarrier spacing; and generating a corresponding low-pass filter according to the determined type of the low-pass filter, and performing low-pass filtering on the received signal by the generated low-pass filter.
In a specific implementation, the down-sampling unit 205 may be configured to determine a down-sampling order according to a sampling rate of the received signal and a sampling rate of the ADC; and according to the down-sampling order, down-sampling the received signal after the low-pass filtering.
In a specific implementation, the down-sampling unit 205 may be configured to divide the sampling rate of the ADC by the sampling rate of the received signal, and use the quotient obtained as the down-sampling order.
In a specific implementation, the obtaining unit 206 may be configured to perform time-domain cross-correlation calculation on the down-sampled received signal and the local time-domain PSS signal; performing a modular square operation on a result obtained by the cross-correlation calculation, and performing a normalization operation on the modular square operation of the downsampled received signal; performing multi-antenna combination on the normalization operation result, and performing accumulation of a plurality of search lengths; carrying out peak value search and threshold value detection on the accumulated result; and acquiring the timing information and the identification information of the cells in the group according to the detected peak value.
In a specific implementation, the primary synchronization signal detecting device may further include: and a frequency offset estimation value determining unit (not shown in fig. 2) configured to determine a frequency offset estimation value from the multiple frequency offset attempt values according to the local time domain PSS signal, the down-sampled received signal, and a plurality of preset frequency offset attempt values.
In a specific implementation, the frequency offset estimation value determining unit may be configured to obtain peak values corresponding to the multiple frequency offset attempt values, and select a frequency offset attempt value with a largest peak value as the frequency offset estimation value.
In a specific implementation, the primary synchronization signal detecting device may further include: a calibration unit (not shown in fig. 2) configured to calibrate the timing information and the intra-group cell identification information according to the local full bandwidth PSS sequence.
In a specific implementation, the correction unit may be configured to select a preset duration interval with a time point corresponding to the timing information as a central point; and performing PSS detection on the received signals after down sampling in the preset duration interval by adopting the local full-bandwidth PSS sequence so as to calibrate the timing information and the cell identification information in the group.
In a specific implementation, the generating unit 203 may be configured to complement the left and right sides of the partial PSS sequence with the same number of 0 s, respectively, so that the length of the partial PSS sequence after being complemented by 0 is equal to a quotient of the sampling rate of the received signal and the subcarrier interval; and converting the partial PSS sequence after 0 complementing into a local time domain PSS signal.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer instruction is stored, and when the computer instruction runs, the step of the method for detecting a primary synchronization signal according to any of the above embodiments of the present invention is executed, which is not described herein again.
The embodiment of the present invention further provides a user terminal, which includes a memory and a processor, where the memory stores a computer instruction, and the computer instruction executes, when running, the steps of the method for detecting a primary synchronization signal according to any one of the above embodiments of the present invention, which are not described herein again.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructing the relevant hardware through a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (22)
1. A method for primary synchronization signal detection, comprising:
selecting a partial PSS sequence from the local full-bandwidth PSS sequence, wherein the selection comprises the following steps: selecting the PSS sequences symmetrically on two sides of a midpoint from the local full-bandwidth PSS sequence by taking the frequency domain center position of the local full-bandwidth PSS sequence as the midpoint, and taking the PSS sequences as the selected partial PSS sequences; the selected partial PSS sequence comprises an integer number of subcarriers, and the integer number of subcarrier frequencies are continuous;
determining the sampling rate of the received signal according to the bandwidth, the subcarrier interval and the oversampling factor of the partial PSS sequence;
generating a local time domain PSS signal according to the bandwidth of the partial PSS sequence, the subcarrier interval and the sampling rate of the received signal;
low-pass filtering the received signal, and down-sampling the received signal after low-pass filtering according to the sampling rate of the received signal;
and acquiring timing information and cell identification information in the group according to the local time domain PSS signal and the received signal after down sampling.
2. The primary synchronization signal detection method of claim 1, wherein said low pass filtering said received signal comprises:
determining the type of a low-pass filter according to the sampling rate of the received signal, the bandwidth of the partial PSS sequence and the subcarrier interval;
and generating a corresponding low-pass filter according to the determined type of the low-pass filter, and performing low-pass filtering on the received signal by the generated low-pass filter.
3. The primary synchronization signal detection method of claim 2, wherein down-sampling the low-pass filtered received signal comprises:
determining a down-sampling order according to the sampling rate of the received signal and the sampling rate of the ADC;
and according to the down-sampling order, down-sampling the received signal after the low-pass filtering.
4. The method as claimed in claim 3, wherein said determining a down-sampling order according to a sampling rate of the received signal and a sampling rate of the ADC comprises:
and dividing the sampling rate of the ADC by the sampling rate of the received signal to obtain a quotient value serving as the down-sampling order.
5. The method of claim 1, wherein the obtaining timing information and intra-group cell identification information based on the local time domain PSS signal and a downsampled received signal comprises:
performing time domain cross-correlation calculation on the down-sampled received signal and the local time domain PSS signal; performing a modular square operation on a result obtained by the cross-correlation calculation, and performing a normalization operation on the modular square operation of the downsampled received signal;
performing multi-antenna combination on the normalization operation result, and performing accumulation of a plurality of search lengths;
carrying out peak value search and threshold value detection on the accumulated result;
and acquiring the timing information and the identification information of the cells in the group according to the detected peak value.
6. The primary synchronization signal detection method of claim 5, further comprising:
and determining a frequency offset estimation value from the plurality of frequency offset trial values according to the local time domain PSS signal, the downsampled received signal and a plurality of preset frequency offset trial values.
7. The method of detecting a primary synchronization signal of claim 6, wherein said determining a frequency offset estimate from said plurality of frequency offset attempt values comprises:
and acquiring peak values corresponding to the multiple frequency deviation attempted values, and selecting the frequency deviation attempted value with the largest peak value as the frequency deviation estimated value.
8. The primary synchronization signal detection method of claim 1, further comprising, after acquiring the timing information and the intra-group cell identification information:
and calibrating the timing information and the intra-group cell identification information according to the local full-bandwidth PSS sequence.
9. The method of claim 8, wherein the calibrating the timing information and the intra-group cell identity information according to the local full bandwidth PSS sequence comprises:
selecting a preset duration interval by taking the time point corresponding to the timing information as a central point; and performing PSS detection on the received signals after down sampling in the preset duration interval by adopting the local full-bandwidth PSS sequence so as to calibrate the timing information and the cell identification information in the group.
10. The primary synchronization signal detection method of claim 1, wherein the generating a local time domain PSS signal comprises:
respectively complementing 0 with the same number on the left side and the right side of the partial PSS sequence, so that the length of the partial PSS sequence after 0 complementation is equal to the quotient of the sampling rate of the received signal and the subcarrier interval;
and converting the partial PSS sequence after 0 complementing into a local time domain PSS signal.
11. A primary synchronization signal detection apparatus, comprising:
the selecting unit is used for selecting a part of PSS sequences from the local full-bandwidth PSS sequences, and comprises the following steps: selecting the PSS sequences symmetrically on two sides of a midpoint from the local full-bandwidth PSS sequence by taking the frequency domain center position of the local full-bandwidth PSS sequence as the midpoint, and taking the PSS sequences as the selected partial PSS sequences; the selected partial PSS sequence comprises an integer number of subcarriers, and the integer number of subcarrier frequencies are continuous; a determining unit, configured to determine a sampling rate of a received signal according to a bandwidth of the partial PSS sequence, a subcarrier spacing, and an oversampling factor;
a generating unit, configured to generate a local time domain PSS signal according to a bandwidth of the partial PSS sequence, a subcarrier interval, and a sampling rate of the received signal;
a low-pass filtering unit for low-pass filtering the received signal;
a down-sampling unit for down-sampling the low-pass filtered received signal;
and the acquisition unit is used for acquiring timing information and cell identification information in the group according to the local time domain PSS signal and the received signal after down sampling.
12. The primary synchronization signal detection apparatus of claim 11, wherein the low pass filtering unit is configured to determine a type of low pass filter according to a sampling rate of the received signal, a bandwidth of the partial PSS sequence, and the subcarrier spacing; and generating a corresponding low-pass filter according to the determined type of the low-pass filter, and performing low-pass filtering on the received signal by the generated low-pass filter.
13. The apparatus of claim 12, wherein the down-sampling unit is configured to determine a down-sampling order according to a sampling rate of the received signal and a sampling rate of the ADC; and according to the down-sampling order, down-sampling the received signal after the low-pass filtering.
14. The apparatus as claimed in claim 13, wherein the down-sampling unit is configured to divide a sampling rate of the ADC by a sampling rate of the received signal to obtain a quotient, and the quotient is used as the down-sampling order.
15. The primary synchronization signal detection apparatus of claim 11, wherein the obtaining unit is configured to perform time-domain cross-correlation calculation on the down-sampled received signal and the local time-domain PSS signal; performing a modular square operation on a result obtained by the cross-correlation calculation, and performing a normalization operation on the modular square operation of the downsampled received signal; performing multi-antenna combination on the normalization operation result, and performing accumulation of a plurality of search lengths; carrying out peak value search and threshold value detection on the accumulated result; and acquiring the timing information and the identification information of the cells in the group according to the detected peak value.
16. The primary synchronization signal detection apparatus of claim 15, further comprising: and the frequency offset estimation value determining unit is used for determining a frequency offset estimation value from the plurality of frequency offset trial values according to the local time domain PSS signal, the downsampled received signal and a plurality of preset frequency offset trial values.
17. The apparatus of claim 16, wherein the frequency offset estimation value determining unit is configured to obtain a peak value corresponding to the multiple frequency offset attempt values, and select a frequency offset attempt value with a largest peak value as the frequency offset estimation value.
18. The primary synchronization signal detection apparatus of claim 11, further comprising: and the correcting unit is used for correcting the timing information and the intra-group cell identification information according to the local full-bandwidth PSS sequence.
19. The apparatus according to claim 18, wherein the calibration unit is configured to select a preset duration interval with a time point corresponding to the timing information as a central point; and performing PSS detection on the received signals after down sampling in the preset duration interval by adopting the local full-bandwidth PSS sequence so as to calibrate the timing information and the cell identification information in the group.
20. The primary synchronization signal detecting apparatus of claim 11, wherein the generating unit is configured to complement the same number of 0's on each of left and right sides of the partial PSS sequence, such that the length of the partial PSS sequence after being complemented by 0 is equal to a quotient of the sampling rate of the received signal and the subcarrier spacing; and converting the partial PSS sequence after 0 complementing into a local time domain PSS signal.
21. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the primary synchronization signal detection method according to any one of claims 1 to 10.
22. A user terminal comprising a memory and a processor, the memory having stored thereon a computer program, wherein the computer program is operative to perform the steps of the primary synchronization signal detection method according to any one of claims 1 to 10.
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| CN113473522A (en) * | 2021-06-30 | 2021-10-01 | 北京思朗科技有限责任公司 | Method for detecting synchronization information in cell search, related device and storage medium |
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