CN111181889B - Frequency offset estimation sample receiving control method, system, equipment and storage medium - Google Patents
Frequency offset estimation sample receiving control method, system, equipment and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
- H04L27/3872—Compensation for phase rotation in the demodulated signal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a method, a system, equipment and a storage medium for receiving and controlling a frequency offset estimation sample. The method comprises the following steps: receiving a subframe sample of a downlink physical channel; calculating a signal quality parameter based on the subframe samples; and judging whether the signal quality parameter is smaller than a preset signal quality threshold value, if so, skipping back to the step of receiving the subframe sample of the downlink physical channel so as to receive a new subframe sample of the downlink physical channel. The method can calculate the signal quality parameter according to the subframe sample of the downlink physical channel, and determines whether the number of the subframe samples needs to be increased or not based on the relation between the signal quality parameter and the signal quality threshold, so that on one hand, the signal quality estimation is not needed by other modules, the real-time performance and the reliability are improved, on the other hand, the self-adaptive adjustment of the number of the subframe samples is realized, the number of the subframe samples is reasonable, and the real-time performance and the reliability are further improved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method, a system, a device, and a storage medium for controlling reception of a frequency offset estimation sample.
Background
Along with the increasingly obvious differentiation of the application requirements of consumers, the application scenes of the mobile terminal are increasingly differentiated, and it is difficult to have a technical mode which can represent the optimal compromise between the capability and the efficiency under various application scenes. Therefore, for different application scene requirements, mobile communication evolves three major scenes and application technologies thereof: enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low latency (uRLLC). The mMTC, the eMTC (ultra large connection Internet of things) and the NBIOT (narrow-band Internet of things) are application scenarios of the Internet of things, and the two most remarkable application scenarios are coverage enhancement and low power consumption. The low power consumption directly determines that the technical scheme adopted by the receiving terminal cannot adopt an excessively complex noise elimination technology to improve the estimation performance. The characteristic of enhanced coverage (sinr-15 db or even lower) requires that the terminal must ensure the receiving performance on the premise of low power consumption, which brings great challenges to the frequency offset estimation technique. The conventional frequency offset technical scheme is difficult to work when sinr is-15 db, which is reflected in that the estimation variance of the output estimation result is large at the moment, and the performance is difficult to meet. If at this time, the coverage performance is improved by upgrading the conventional scheme by adding the technical details of noise cancellation processing, which is difficult to be received by the low-power-consumption and low-cost terminal. Therefore, a scheme with low implementation cost and high performance output is particularly urgent.
In a communication system, due to the influence of various factors, frequency deviation exists between a receiver and a transmitter, which is reflected in that a received signal carries frequency deviation interference, the interference not only affects the analysis of the received signal, but also can lead to the operation state paralysis of the whole receiver and the network drop problem in serious cases. Therefore, a targeted frequency offset estimation scheme needs to be designed at the receiving end to estimate the frequency offset existing between the receiver and the transmitter, and then corresponding correction compensation is performed at the receiving end to ensure the performance of the receiver.
The existing frequency offset estimation scheme has a phase difference scheme, that is, the frequency offset estimation is performed by using the phase difference carried by the channel estimation between different OFDM symbols. The scheme has the advantages that under a weak signal scene, particularly under an enhanced coverage scene such as eMTC and NBIOT, the estimation performance is poor, the variance among estimation result samples is large, if the difference among estimation results of each time is not distinguished in the overall application of the estimation results, a uniform processing mode is adopted, the influence of the poor quality samples on the overall estimation performance is inevitably caused, and the obvious effect is that if the estimation results of one time are abnormal, the RF (radio frequency) adjustment is carried out wrongly, and when the frequency offset is estimated next time due to the adjustment, the residual frequency offset exceeds the estimation range of the estimation scheme, so that the frequency offset is difficult to converge again.
In order to deal with the problem of estimation variance in weak signal scenes, two main improvement measures are adopted at the present stage:
the first is to use more samples fixedly. The method cannot perform the optimum in all signal scenes, and if the set samples are too many, the method is represented as insufficient real-time performance of frequency offset estimation in good signal quality scenes; if the set samples are too few, it is difficult to ensure the reliability of the vast number of estimation result outputs.
The second is to decide the number of samples used for frequency offset estimation by means of signal quality estimation indicators of other modules in the system. In this method, since the index needs to be estimated by using the signal quality of other modules, not only reliability is questionable, but also a certain hysteresis exists in real time, and the signal quality of the preceding sample does not completely determine the signal quality of the subsequent sample.
Disclosure of Invention
The present invention is directed to overcome the defects in the prior art that, in the frequency offset estimation process, especially in a weak signal scene, the estimation result is unreliable and has hysteresis due to an unreasonable number of samples, and provides a method, a system, a device and a storage medium for controlling the reception of a frequency offset estimation sample.
The invention solves the technical problems through the following technical scheme:
a sample reception control method for frequency offset estimation, the sample reception control method comprising:
receiving a subframe sample of a downlink physical channel;
calculating a signal quality parameter based on the subframe samples;
and judging whether the signal quality parameter is smaller than a preset signal quality threshold value, if so, skipping back to the step of receiving the subframe sample of the downlink physical channel so as to receive a new subframe sample of the downlink physical channel.
Preferably, the step of calculating a signal quality parameter based on the subframe samples comprises:
performing time-frequency conversion on the time domain received data in the subframe sample to obtain frequency domain received physical signals corresponding to each OFDM (orthogonal frequency division multiplexing) symbol carrying the physical signals in the subframe sample;
reconstructing a local physical signal corresponding to the OFDM;
calculating frequency domain channel impulse response corresponding to the OFDM according to the frequency domain received physical signal and the local physical signal;
calculating channel phase difference information and noise power information according to the frequency domain channel impulse response;
calculating signal power information according to the channel phase difference information;
calculating a signal quality parameter based on the signal power information and the noise power information.
Preferably, the method for controlling the reception of the samples further includes counting a total number of received subframe samples after receiving the subframe samples of the downlink physical channel;
when the total number of received subframe samples is equal to 1, the signal quality parameter is equal to the ratio of the signal power information to the noise interference power information;
when the total number of received subframe samples is greater than 1, the signal quality parameter is equal to a ratio of smoothed signal power information to smoothed noise power information, the smoothed signal power information being equal to a sum of signal power information calculated based on a most recently received subframe sample and smoothed signal power information calculated based on a previously received subframe sample, the smoothed noise power information being equal to a sum of noise power information calculated based on a most recently received subframe sample and smoothed noise power information calculated based on a previously received subframe sample.
Preferably, the physical signal is any one of CRS (cell reference signal), PSS (primary synchronization signal), SSS (axial synchronization signal), NRS (narrowband reference signal), and DMRS (demodulation reference signal).
A sample reception control system for frequency offset estimation, comprising:
a sample receiving module, configured to receive a subframe sample of a downlink physical channel;
a quality calculation module for calculating a signal quality parameter based on the subframe samples;
and the receiving control module is used for judging whether the signal quality parameter is smaller than a preset signal quality threshold value, and if so, calling the sample receiving module to receive a new subframe sample of the downlink physical channel.
Preferably, the mass calculation module includes:
the signal conversion sub-module is used for performing time-frequency conversion on the time domain receiving data in the subframe sample to obtain frequency domain receiving physical signals corresponding to each OFDM symbol carrying the physical signals in the subframe sample;
the signal reconstruction submodule is used for reconstructing a local physical signal corresponding to the OFDM;
the impulse response submodule is used for calculating the frequency domain channel impulse response corresponding to the OFDM according to the frequency domain receiving physical signal and the local physical signal;
the phase difference calculation submodule is used for calculating channel phase difference information according to the frequency domain channel impulse response;
the disturbing sound calculation sub-module is used for calculating disturbing sound power information according to the frequency domain channel impulse response;
the power calculation submodule is used for calculating signal power information according to the channel phase difference information;
and the quality calculation submodule is used for calculating a signal quality parameter based on the signal power information and the noise interference power information.
Preferably, the sample receiving module is further configured to count a total number of received subframe samples after receiving the subframe samples of the downlink physical channel;
when the total number of received subframe samples is equal to 1, the signal quality parameter is equal to the ratio of the signal power information to the noise interference power information;
when the total number of received subframe samples is greater than 1, the signal quality parameter is equal to a ratio of smoothed signal power information to smoothed noise power information, the smoothed signal power information being equal to a sum of signal power information calculated based on a most recently received subframe sample and smoothed signal power information calculated based on a previously received subframe sample, the smoothed noise power information being equal to a sum of noise power information calculated based on a most recently received subframe sample and smoothed noise power information calculated based on a previously received subframe sample.
Preferably, the physical signal is any one of CRS, PSS, SSS, NRS, and DMRS.
An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the sample reception control method for frequency offset estimation as described above when executing the program.
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 sample reception control method for frequency offset estimation as described above.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: the method can calculate the signal quality parameter according to the subframe sample of the downlink physical channel, and determines whether the number of the subframe samples needs to be increased or not based on the relation between the signal quality parameter and the signal quality threshold, so that on one hand, the signal quality estimation is not needed by other modules, the real-time performance and the reliability are improved, on the other hand, the self-adaptive adjustment of the number of the subframe samples is realized, the number of the subframe samples is reasonable, and the real-time performance and the reliability are further improved.
Drawings
Fig. 1 is a flowchart of a sample reception control method for frequency offset estimation according to embodiment 1 of the present invention;
fig. 2 is a flowchart of a specific step 12 of a sample reception control method for frequency offset estimation according to embodiment 2 of the present invention;
fig. 3 is a schematic block diagram of a sample reception control system for frequency offset estimation according to embodiment 3 of the present invention;
fig. 4 is a schematic block diagram of a sample reception control system for frequency offset estimation according to embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of an electronic device according to embodiment 5 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
Fig. 1 illustrates a sample reception control method for frequency offset estimation. The sample receiving control method is suitable for controlling the number of received samples when estimating the frequency difference between a receiver and a transmitter in various communication systems. The sample reception control method includes the steps of:
step 11: subframe samples of a downlink physical channel are received.
Step 12: a signal quality parameter is calculated based on the subframe samples.
Step 13: and judging whether the signal quality parameter is smaller than a preset signal quality threshold value, if so, skipping back to the step 11 to receive a new subframe sample of the downlink physical channel, and if not, ending the subframe sample reception or performing subsequent frequency offset estimation by using the received subframe sample.
The signal quality parameter is used to measure the quality of the signal, and the signal quality threshold may be determined according to actual requirements (e.g., receiver performance, accuracy requirement).
In the sample reception control method of this embodiment, the signal quality parameter is calculated according to the subframe sample of the received downlink physical channel, and is obtained without using other modules or manners, thereby ensuring the real-time performance and reliability of signal quality estimation; and whether the number of subframe samples needs to be increased or not is determined based on the relation between the signal quality parameter and the signal quality threshold, so that the self-adaptive adjustment of the number of subframe samples is realized, the problems that the real-time performance is influenced by the excessive number of samples and the reliability is influenced by the insufficient number of samples are avoided, the whole number of samples is reasonable, and the real-time performance and the reliability of frequency offset estimation are further improved.
Example 2
This example is a further illustration on example 1. The sample reception control method of this embodiment provides a specific process for calculating a signal quality parameter, as shown in fig. 2, step 12 specifically includes:
step 121: and performing time-frequency conversion on the time domain receiving data in the subframe sample to obtain frequency domain receiving physical signals corresponding to each OFDM symbol carrying the physical signals in the subframe sample.
Step 122: and reconstructing the local physical signal corresponding to the OFDM.
Step 123: and calculating the frequency domain channel impulse response corresponding to the OFDM according to the frequency domain received physical signal and the local physical signal.
Step 124: and calculating channel phase difference information and noise power information according to the frequency domain channel impulse response.
Step 125: and calculating signal power information according to the channel phase difference information.
Step 126: calculating a signal quality parameter based on the signal power information and the noise power information.
This embodiment only shows a specific process of step 12, and on the basis of the above process, the steps may be split or the execution order of the steps may be changed without changing the basic principle, for example, steps 124 to 125 are modified to calculate channel phase difference information according to the frequency domain channel impulse response, then calculate signal power information according to the channel phase difference information, and then calculate the noise power information according to the frequency domain channel impulse response.
In the above steps 121 to 126, the quality of the signal is measured based on the physical signal carried in the subframe sample, the signal power information and the noise interference power information calculated thereby, so that the reliability and the real-time performance of the calculation result are ensured.
In this embodiment, the formula for calculating the signal quality parameter in step 126 may be different for different numbers of subframe samples. Specifically, step 11 of the frequency offset estimation method in this embodiment may further include counting the total number of received subframe samples after receiving the subframe samples of the downlink physical channel. The total number of the subframe samples is initially 0, and 1 is added to the total number of the subframe samples when a new subframe sample is received.
In step 126, when the total number of received subframe samples is equal to 1, the signal quality parameter is equal to the ratio of the signal power information to the noise interference power information.
In step 126, when the total number of received subframe samples is greater than 1, the signal quality parameter is equal to the ratio of smooth signal power information to smooth noise power information, the smooth signal power information is equal to the sum of signal power information calculated based on the latest received subframe sample and smooth signal power information calculated based on the previously received subframe sample, and the smooth noise power information is equal to the sum of noise power information calculated based on the latest received subframe sample and smooth noise power information calculated based on the previously received subframe sample. Here, the subframe samples received before and after the occurrence of the text refer to all the subframe samples that are received, excluding the subframe sample that is left after the latest subframe sample received. The specific way of calculating the smooth signal power information and the smooth noise power information may be various, for example, solving a signal power average value and a noise power average value of a subframe sample received before.
In the embodiment, the number of the subframe samples is adjusted in a self-adaptive manner, so that the estimation of the signal quality is guaranteed, a good foundation is laid for the subsequent accurate calculation of the frequency offset estimation value, and the frequency offset estimation result is optimized. This embodiment provides a calculation formula of a usable frequency offset estimation value:
when the total number of received subframe samples is equal to 1, the calculation formula of the frequency offset estimation value is as follows:
wherein, FreqEst represents a frequency offset estimation value, PhasePara represents the channel phase difference information, and Δ t represents a time interval between frequency domain channel impulse responses corresponding to two OFDM for calculating the channel phase difference information;
when the total number of the received subframe samples is greater than 1, the calculation formula of the frequency offset estimation value is as follows:
wherein, FreqEst represents a frequency offset estimation value, phaseparamide represents smoothed channel phase difference information, the smoothed channel phase difference information is equal to the sum of channel phase difference information calculated based on a latest received subframe sample and smoothed channel phase difference information calculated based on a previously received subframe sample, and Δ t represents a time interval between frequency domain channel impulse responses corresponding to two OFDM for calculating the channel phase difference information. The specific way to calculate the smoothed channel phase difference information may be various, for example, solving an average value of the channel phase differences of the subframe samples received before.
Of course, the subframe samples received in this embodiment are not limited to the above frequency offset estimation method, and other estimation methods are also applicable.
The method of the embodiment is applicable to various communication systems, such as LTE, eMTC, NBIOT, NR, and the like, and different physical signals, such as any one of CRS, PSS, SSS, NRs, and DMRS, may be selected for different communication systems.
The method of this embodiment is specifically described below by taking CRS in an eMTC system as an example:
in step 11, receiving a subframe sample of a downlink physical channel;
in step 121, performing FFT (fast fourier transform) time-frequency conversion on the time-domain received data in the subframe sample to obtain a received frequency-domain CRS signal RecCRS corresponding to each OFDM symbol carrying CRS in the subframe sample l，k Wherein 1 represents an ofdm symbol carrying CRS, and the value is 0, 1, 2, 3; k represents a CRS frequency domain index, and the value is 0, 1.
In step 122, local CRS signals localrs corresponding to the OFDM are reconstructed l，k (ii) a The reconfiguration process needs to combine information such as a cell ID, a received downlink subframe number, and a CP (cyclic prefix) type, and specifically includes:
the generation of local CRS is as follows:
n s identifying a slot number in a radio frame, l identifying an OFDM symbol in a slot;
the generation of c (i) is as follows:
x 2 (n+31)＝(x 2 (n+3)+x 2 (n+2)+x 2 (n+1)+x 2 (n))mod 2
x 1 (0)＝1，x 1 (n)＝0，n＝1，2，...，30；
wherein the content of the first and second substances,
identifying a cell number;
ncp is equal to 1 if the CP type is a normal CP, and is equal to 0 if the CP type is an extended CP.
In step 123, according to RecCRS l，k And LocalCRS l，k Calculating mapping position frequency domain channel impulse response FH of each CRS resource unit l，k The formula of (1) is:
FH l，k ＝LocalCRS l，k *conj(RecCRS l，k )
in step 124, according to FH l，k The formula for calculating the channel phase difference information PhasePara and the noise interference power information NosiePara is as follows:
in step 125, the formula for calculating the signal power information SignalPara according to PhasePara is:
SignalPara＝abs(real(PhasePara))
in step 126, a formula for calculating a signal quality parameter based on the signal power information and the noise interference power information is:
when the total number of subframe samples equals 1:
when the total number of subframe samples is greater than 1:
in step 13, after the size relationship between SignalQualPara and the signal quality threshold SignalQualTh is determined, if SignalQualPara < SignalQualTh, it indicates that the signal quality is low, and more samples need to be used to smooth the influence of noise on the performance of the estimation result, so the process goes back to step 11; if the signal quality is higher, the frequency offset estimation result can be quickly obtained without using more samples, and therefore, the frequency offset estimation value is calculated by using the received subframe samples.
It should be noted that, if other systems or physical signals are used to implement the frequency offset estimation method of this embodiment, the process of calculating the received frequency domain physical signal and reconstructing the local physical signal may be changed, but the whole process is similar to the operation, and therefore, the description is omitted.
The sample receiving control method of the embodiment evaluates the signal quality through the noise disturbing factor, controls the sample quantity through the signal quality parameter, performs frequency offset estimation only when the obtained signal quality is good, otherwise increases the samples until the signal quality requirement is met, and ensures the sufficient sample quantity.
Example 3
Fig. 3 shows a sample reception control system for frequency offset estimation of the present embodiment. The sample reception control system is suitable for controlling the number of received samples when estimating the frequency difference between a receiver and a transmitter in various communication systems. The sample reception control system includes: a sample receiving module 21, a quality calculating module 22 and a reception control module 23.
The sample receiving module 21 is configured to receive subframe samples of a downlink physical channel.
The quality calculation module 22 is configured to calculate a signal quality parameter based on the subframe samples.
The receiving control module 23 is configured to determine whether the signal quality parameter is smaller than a preset signal quality threshold, if so, invoke the sample receiving module 21 to receive a new subframe sample of the downlink physical channel, and if not, end subframe sample reception or perform subsequent frequency offset estimation by using the received subframe sample.
The signal quality parameter is used to measure the quality of the signal, and the signal quality threshold may be determined according to actual requirements (e.g., receiver performance, accuracy requirement).
In the sample reception control system of this embodiment, the signal quality parameter is calculated according to the subframe sample of the received downlink physical channel, and is obtained without using other modules or manners, thereby ensuring the real-time performance and reliability of signal quality estimation; and whether the number of subframe samples needs to be increased or not is determined based on the relation between the signal quality parameter and the signal quality threshold, so that the self-adaptive adjustment of the number of subframe samples is realized, the problems that the real-time performance is influenced by the excessive number of samples and the reliability is influenced by the insufficient number of samples are avoided, the whole number of samples is reasonable, and the real-time performance and the reliability of frequency offset estimation are further improved.
Example 4
This example is a further illustration on example 3. The sample receiving control system of this embodiment provides a specific process for calculating a signal quality parameter, and as shown in fig. 4, the quality calculation module 22 includes a signal conversion sub-module 221, a signal reconstruction sub-module 222, an impulse response sub-module 223, a phase difference calculation sub-module 224, an interference sound calculation sub-module 225, a power calculation sub-module 226, and a quality calculation sub-module 227.
The signal conversion sub-module 221 is configured to perform time-frequency conversion on the time domain received data in the subframe sample to obtain frequency domain received physical signals corresponding to each OFDM symbol carrying physical signals in the subframe sample;
the signal reconstruction sub-module 222 is configured to reconstruct a local physical signal corresponding to the OFDM;
the impulse response sub-module 223 is configured to calculate a frequency domain channel impulse response corresponding to the OFDM according to the frequency domain received physical signal and the local physical signal;
the phase difference calculating submodule 224 is configured to calculate channel phase difference information according to the frequency domain channel impulse response;
the noise-disturbing calculation submodule 225 is configured to calculate noise-disturbing power information according to the frequency-domain channel impulse response;
the power calculation sub-module 226 is configured to calculate signal power information according to the channel phase difference information;
the quality calculation submodule 227 is configured to calculate a signal quality parameter based on the signal power information and the noise power information.
The sub-module measures the quality of the signal based on the physical signal carried in the sub-frame sample, the signal power information and the noise interference power information calculated by the physical signal, so that the reliability and the real-time performance of the calculation result are guaranteed.
In this embodiment, the calculation formula used by the quality calculation sub-module may be different for different numbers of subframe samples. Specifically, the sample receiving module 21 is further configured to count a total number of received subframe samples after receiving the subframe samples of the downlink physical channel.
In the quality calculating submodule 227, when the total number of received subframe samples is equal to 1, the signal quality parameter is equal to the ratio of the signal power information to the noise interference power information;
in the quality calculation sub-module 227, when the total number of received subframe samples is greater than 1, the signal quality parameter is equal to the ratio of smooth signal power information to smooth noise power information, the smooth signal power information is equal to the sum of signal power information calculated based on the latest received subframe sample and smooth signal power information calculated based on the previously received subframe sample, and the smooth noise power information is equal to the sum of noise power information calculated based on the latest received subframe sample and smooth noise power information calculated based on the previously received subframe sample.
In the embodiment, the number of the subframe samples is adjusted in a self-adaptive manner, so that the estimation of the signal quality is guaranteed, a good foundation is laid for the subsequent accurate calculation of the frequency offset estimation value, and the frequency offset estimation result is optimized. This embodiment provides a calculation formula of a usable frequency offset estimation value:
when the total number of the received subframe samples is equal to 1, the calculation formula of the frequency offset estimation value is as follows:
wherein, FreqEst represents a frequency offset estimation value, PhasePara represents the channel phase difference information, and Δ t represents a time interval between frequency domain channel impulse responses corresponding to two OFDM for calculating the channel phase difference information;
when the total number of the received subframe samples is greater than 1, the calculation formula of the frequency offset estimation value is as follows:
wherein, FreqEst represents a frequency offset estimation value, phaseparamide represents smoothed channel phase difference information, the smoothed channel phase difference information is equal to the sum of channel phase difference information calculated based on a latest received subframe sample and smoothed channel phase difference information calculated based on a previously received subframe sample, and Δ t represents a time interval between frequency domain channel impulse responses corresponding to two OFDM for calculating the channel phase difference information. The specific way to calculate the smoothed channel phase difference information may be various, for example, solving an average value of the channel phase differences of the subframe samples received before.
The system of the present embodiment is applicable to various communication systems, such as LTE, eMTC, NBIOT, NR, and the like, and different physical signals, for example, any one of CRS (cell reference signal), PSS (primary synchronization signal), SSS (axial synchronization signal), NRs (narrowband reference signal), and DMRS (demodulation reference signal) may be selected for different communication systems.
The sample receiving control system of the embodiment evaluates the signal quality through the noise disturbing factor, and controls the sample quantity through the signal quality parameter, only when the obtained signal quality is good, the frequency offset estimation is carried out, otherwise, the samples are added until the signal quality requirement is met, and the estimation is carried out, so that the sufficient sample quantity is ensured.
Example 5
Fig. 5 is a schematic structural diagram of an electronic device according to embodiment 5 of the present invention. The electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor implements the sample reception control method for frequency offset estimation of embodiment 1 or 2 when executing the program. The electronic device 40 shown in fig. 5 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiment of the present invention.
As shown in fig. 5, the electronic device 40 may be embodied in the form of a general purpose computing device, which may be, for example, a server device. The components of electronic device 40 may include, but are not limited to: the at least one processor 41, the at least one memory 42, and a bus 43 connecting the various system components (including the memory 42 and the processor 41).
The bus 43 includes a data bus, an address bus, and a control bus.
The memory 42 may include volatile memory, such as Random Access Memory (RAM)421 and/or cache memory 422, and may further include Read Only Memory (ROM) 423.
The processor 41 executes a computer program stored in the memory 42, thereby executing various functional applications and data processing, such as the sample reception control method for frequency offset estimation provided in embodiment 1 or 2 of the present invention.
The electronic device 40 may also communicate with one or more external devices 44 (e.g., keyboard, pointing device, etc.). Such communication may be through an input/output (I/O) interface 45. Also, model-generating device 40 may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet) via network adapter 46. As shown in FIG. 5, the network adapter 46 communicates with the other modules of the model-generated device 40 via the bus 43. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the model-generating device 40, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, to name a few.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of the electronic device are mentioned, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the units/modules described above may be embodied in one unit/module according to embodiments of the invention. Conversely, the features and functions of one unit/module described above may be further divided into embodiments by a plurality of units/modules.
Example 6
The present embodiment provides a computer-readable storage medium on which a computer program is stored, which when executed by a processor, implements the steps of the sample reception control method for frequency offset estimation provided in embodiment 1 or 2.
More specific examples, among others, that the readable storage medium may employ may include, but are not limited to: a portable disk, a hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible implementation manner, the present invention can also be implemented in the form of a program product, which includes program code for causing a terminal device to execute the steps of implementing the sample reception control method for frequency offset estimation described in embodiment 1 or 2 when the program product is run on the terminal device.
Where program code for carrying out the invention is written in any combination of one or more programming languages, the program code may be executed entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device and partly on a remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (8)
1. A sample reception control method for frequency offset estimation, the sample reception control method comprising:
receiving a subframe sample of a downlink physical channel;
calculating a signal quality parameter based on the subframe samples;
judging whether the signal quality parameter is smaller than a preset signal quality threshold value, if so, skipping back to the step of receiving the subframe sample of the downlink physical channel to receive a new subframe sample of the downlink physical channel;
the sample receiving control method also comprises the steps of counting the total number of received subframe samples after receiving the subframe samples of the downlink physical channel;
when the total number of received subframe samples is equal to 1, the signal quality parameter is equal to the ratio of signal power information to noise interference power information;
when the total number of received subframe samples is greater than 1, the signal quality parameter is equal to a ratio of smoothed signal power information to smoothed noise power information, the smoothed signal power information being equal to an average of signal power information calculated based on a most recently received subframe sample and signal power information calculated based on a previously received subframe sample, the smoothed noise power information being equal to an average of noise power information calculated based on a most recently received subframe sample and noise power information calculated based on a previously received subframe sample.
2. The sample reception control method according to claim 1, wherein the step of calculating a signal quality parameter based on the subframe samples comprises:
performing time-frequency conversion on the time domain received data in the subframe sample to obtain frequency domain received physical signals corresponding to each OFDM symbol carrying the physical signals in the subframe sample;
reconstructing a local physical signal corresponding to the OFDM;
calculating frequency domain channel impulse response corresponding to the OFDM according to the frequency domain received physical signal and the local physical signal;
calculating channel phase difference information and the noise disturbing power information according to the frequency domain channel impulse response;
calculating the signal power information according to the channel phase difference information;
and calculating a signal quality parameter based on the signal power information and the noise disturbing power information.
3. The sample reception control method according to claim 2, wherein the physical signal is any one of CRS, PSS, SSS, NRS, and DMRS.
4. A sample reception control system for frequency offset estimation, comprising:
a sample receiving module, configured to receive a subframe sample of a downlink physical channel;
a quality calculation module for calculating a signal quality parameter based on the subframe samples;
a receiving control module, configured to determine whether the signal quality parameter is smaller than a preset signal quality threshold, and if so, invoke the sample receiving module to receive a new subframe sample of the downlink physical channel;
the sample receiving module is further configured to count the total number of received subframe samples after receiving the subframe samples of the downlink physical channel;
when the total number of received subframe samples is equal to 1, the signal quality parameter is equal to the ratio of signal power information to noise interference power information;
when the total number of received subframe samples is greater than 1, the signal quality parameter is equal to a ratio of smoothed signal power information to smoothed noise power information, the smoothed signal power information being equal to an average of signal power information calculated based on a most recently received subframe sample and signal power information calculated based on a previously received subframe sample, the smoothed noise power information being equal to an average of noise power information calculated based on a most recently received subframe sample and noise power information calculated based on a previously received subframe sample.
5. The sample reception control system according to claim 4, wherein the mass calculation module includes:
the signal conversion sub-module is used for performing time-frequency conversion on the time domain receiving data in the subframe sample to obtain frequency domain receiving physical signals corresponding to each OFDM symbol carrying the physical signals in the subframe sample;
the signal reconstruction submodule is used for reconstructing a local physical signal corresponding to the OFDM;
the impulse response submodule is used for calculating the frequency domain channel impulse response corresponding to the OFDM according to the frequency domain receiving physical signal and the local physical signal;
the phase difference calculation submodule is used for calculating channel phase difference information according to the frequency domain channel impulse response;
the disturbing sound calculation sub-module is used for calculating the disturbing sound power information according to the frequency domain channel impulse response;
the power calculation submodule is used for calculating the signal power information according to the channel phase difference information;
and the quality calculation submodule is used for calculating a signal quality parameter based on the signal power information and the interference sound power information.
6. The sample reception control system according to claim 5, wherein the physical signal is any one of a CRS, a PSS, a SSS, a NRS, and a DMRS.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the sample reception control method for frequency offset estimation of any one of claims 1 to 3 when executing the program.
8. 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 method for sample reception control for frequency offset estimation of any one of claims 1 to 3.
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