CN110855595B - Time offset estimation method, device, receiver and storage medium - Google Patents
Time offset estimation method, device, receiver and storage medium Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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Abstract
The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for estimating a time offset, a receiver, and a storage medium. The method comprises the following steps: a receiver acquires frequency domain channel estimation corresponding to a received frequency domain signal; selecting a first frequency domain data segment and a second frequency domain data segment from the frequency domain channel estimates, the first frequency domain data segment and the second frequency domain data segment both being subsets of the frequency domain channel estimates; and calculating to obtain a time offset estimation value according to the phase relation between the time domain peaks corresponding to the first frequency domain data section and the second frequency domain data section. According to the embodiment of the disclosure, the time offset estimation value is obtained by calculation according to the phase relation between the time domain peaks corresponding to the first frequency domain data segment and the second frequency domain data segment, so that the accuracy of the estimation result is higher, the problem of more complex time offset estimation or poorer effect in the related art is avoided, and the performance of the receiver is improved.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and an apparatus for estimating a time offset, a receiver, and a storage medium.
Background
In the current communication system, the timing synchronization problem is a key problem affecting the accuracy of channel transmission, and is one of the important factors determining the performance of the communication system. Since a large time offset may cause inter-symbol interference and even destroy the orthogonality of subcarriers, a low-complexity and high-reliability timing offset (i.e., time offset) estimation method is particularly important for a communication system.
In the related art, the general time offset estimation methods mainly include two methods: one is blind detection and blind estimation based on cyclic prefix, and has the defect of limited detection timing offset range, and the other is high in complexity and poor in anti-noise capability because the timing offset estimation is completed based on the training sequences of the primary synchronization signal and the secondary synchronization signal.
A reasonable and effective time offset estimation method has not been provided in the related art.
Disclosure of Invention
In view of the above, the present disclosure provides a time offset estimation method, apparatus, receiver and storage medium.
The technical scheme comprises the following steps:
according to an aspect of the present disclosure, there is provided a time offset estimation method for use in a receiver, the method including:
acquiring frequency domain channel estimation corresponding to the received frequency domain signal;
selecting a first frequency domain data segment and a second frequency domain data segment from the frequency domain channel estimates, the first frequency domain data segment and the second frequency domain data segment both being subsets of the frequency domain channel estimates;
and calculating to obtain a time offset estimation value according to the phase relation between the time domain peaks corresponding to the first frequency domain data section and the second frequency domain data section.
In a possible implementation manner, the calculating a time offset estimation value according to a phase relationship between time domain peaks corresponding to the first frequency domain data segment and the second frequency domain data segment includes:
respectively transforming the first frequency domain data section and the second frequency domain data section to a time domain for peak value search to obtain a first time domain peak value corresponding to the first frequency domain data section and a second time domain peak value corresponding to the second frequency domain data section;
and calculating to obtain the time offset estimation value according to the phase relation between the first time domain peak value and the second time domain peak value.
In another possible implementation manner, the transforming the first frequency domain data segment and the second frequency domain data segment to the time domain respectively for peak search to obtain a first time domain peak corresponding to the first time domain data segment and a second time domain peak corresponding to the second time domain data segment includes:
performing zero padding expansion processing on the first frequency domain data section and the second frequency domain data section respectively to obtain an expanded first frequency domain data section and an expanded second frequency domain data section, wherein the expanded first frequency domain data section and the expanded second frequency domain data section are both data sections with N data, and N is a positive integer greater than 1;
performing Inverse Fast Fourier Transform (IFFT) processing on the expanded first frequency domain data section and the expanded second frequency domain data section respectively to obtain a first time domain data section and a second time domain data section;
and acquiring the first time domain peak value corresponding to the first time domain data section and the second time domain peak value corresponding to the second time domain data section.
In another possible implementation manner, the calculating the time offset estimation value according to the phase relationship between the first time domain peak and the second time domain peak includes:
acquiring a phase difference between the first time domain peak value and the second time domain peak value;
and calculating to obtain the time offset estimation value according to the phase difference.
In another possible implementation manner, the obtaining a phase difference between the first time domain peak and the second time domain peak includes:
calculating the phase difference according to the first time domain peak value and the second time domain peak value by the following formula
Wherein, the X1corr(max _ idx) is the first time domain peak, X2corr(max _ idx) is the second time-domain peak, and the angle () is an angle function.
In another possible implementation manner, the calculating the time offset estimation value according to the phase difference includes:
and according to the phase difference, calculating the time bias estimation value to _ est by the following formula:
wherein, theThe above-mentioned
And for the phase difference, N is an ifft point number, and offset is a preset selection parameter.
According to another aspect of the present disclosure, there is provided a time offset estimation apparatus for use in a receiver, the apparatus including:
an obtaining module, configured to obtain a frequency domain channel estimate corresponding to a received frequency domain signal;
a selecting module configured to select a first frequency domain data segment and a second frequency domain data segment from the frequency domain channel estimation, where the first frequency domain data segment and the second frequency domain data segment are subsets of the frequency domain channel estimation;
and the calculating module is used for calculating to obtain a time offset estimation value according to the phase relation between the time domain peak values corresponding to the first frequency domain data section and the second frequency domain data section.
In a possible implementation manner, the calculating module is further configured to transform the first frequency domain data segment and the second frequency domain data segment to a time domain respectively for peak search, so as to obtain a first time domain peak corresponding to the first frequency domain data segment and a second time domain peak corresponding to the second frequency domain data segment; and calculating to obtain the time offset estimation value according to the phase relation between the first time domain peak value and the second time domain peak value.
In another possible implementation manner, the calculation module is further configured to:
performing zero padding expansion processing on the first frequency domain data section and the second frequency domain data section respectively to obtain an expanded first frequency domain data section and an expanded second frequency domain data section, wherein the expanded first frequency domain data section and the expanded second frequency domain data section are both data sections with N data, and N is a positive integer greater than 1;
performing Inverse Fast Fourier Transform (IFFT) processing on the expanded first frequency domain data section and the expanded second frequency domain data section respectively to obtain a first time domain data section and a second time domain data section;
and acquiring the first time domain peak value corresponding to the first time domain data section and the second time domain peak value corresponding to the second time domain data section.
In another possible implementation manner, the calculating module is further configured to obtain a phase difference between the first time domain peak and the second time domain peak; and calculating to obtain the time offset estimation value according to the phase difference.
In another possible implementation manner, the calculating module is further configured to calculate the phase difference according to the first time domain peak value and the second time domain peak value by using the following formula
Wherein, the X1corr(max _ idx) is the first time domain peak, X2corr(max _ idx) is the second time-domain peak, and the angle () is an angle function.
In another possible implementation manner, the calculating module is further configured to calculate the time offset estimation value to _ est according to the phase difference by using the following formula:
wherein, the
And for the phase difference, N is an ifft point number, and offset is a preset selection parameter.
According to another aspect of the present disclosure, there is provided a receiver including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
acquiring frequency domain channel estimation corresponding to the received frequency domain signal;
selecting a first frequency domain data segment and a second frequency domain data segment from the frequency domain channel estimates, the first frequency domain data segment and the second frequency domain data segment both being subsets of the frequency domain channel estimates;
and calculating to obtain a time offset estimation value according to the phase relation between the time domain peaks corresponding to the first frequency domain data section and the second frequency domain data section.
According to another aspect of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the above-described method.
The method comprises the steps of acquiring frequency domain channel estimation corresponding to a received frequency domain signal through a receiver; selecting a first frequency domain data section and a second frequency domain data section from the frequency domain channel estimation, wherein the first frequency domain data section and the second frequency domain data section are subsets of the frequency domain channel estimation; calculating to obtain a time offset estimation value according to the phase relation between the time domain peak values corresponding to the first frequency domain data section and the second frequency domain data section; the time offset estimation value is obtained by calculation according to the phase relation between the time domain peaks corresponding to the first frequency domain data section and the second frequency domain data section, so that the accurate reading of the estimation result is higher, the problem that the time offset estimation is more complex or has poorer effect in the related technology is solved, and the performance of the receiver is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram of a mobile communication system provided in an exemplary embodiment of the present disclosure;
fig. 2 shows a flowchart of a time offset estimation method provided by an exemplary embodiment of the present disclosure;
fig. 3 shows a flowchart of a time offset estimation method provided by another exemplary embodiment of the present disclosure;
FIG. 4 is a diagram illustrating simulation data involved in a time offset estimation method according to an exemplary embodiment of the disclosure;
fig. 5 shows a schematic structural diagram of a time offset estimation apparatus according to an exemplary embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
Aiming at the problem that the time offset estimation in the related technology is complex or has poor effect in the related technology, an effective solution is not provided at present. Therefore, the embodiment of the disclosure provides a time offset estimation method, a time offset estimation device, a receiver and a storage medium. The method comprises the steps of acquiring frequency domain channel estimation corresponding to a received frequency domain signal through a receiver; selecting a first frequency domain data section and a second frequency domain data section from the frequency domain channel estimation, wherein the first frequency domain data section and the second frequency domain data section are subsets of the frequency domain channel estimation; according to the phase relation between the time domain peaks corresponding to the first frequency domain data section and the second frequency domain data section, the time offset estimation value is obtained through calculation, so that the accurate reading of the estimation result is high, the problem that the time offset estimation is complex or poor in effect in the related technology is solved, and the performance of the receiver is improved.
Before explaining the embodiments of the present disclosure, an application scenario of the embodiments of the present disclosure is explained. Referring to fig. 1, a schematic structural diagram of a mobile communication system according to an exemplary embodiment of the present disclosure is shown. The mobile communication system may be an LTE system, or may also be a 5G system, where the 5G system is also called a New Radio (NR) system, or may also be a next-generation mobile communication technology system of 5G, and the embodiment is not limited thereto.
Optionally, the mobile communication system is applicable to different network architectures, including but not limited to a relay network architecture, a dual link architecture, a V2X architecture, and the like. The mobile communication system includes: access network devices and terminal devices 140.
The Access Network device 120 may be a Base Station (BS), which may also be referred to as a base station device, and is a device deployed in a Radio Access Network (RAN) to provide a wireless communication function. For example, the device providing the base station function in the 2G network includes a Base Transceiver Station (BTS), the device providing the base station function in the 3G network includes a node B (english: NodeB), the device providing the base station function in the 4G network includes an evolved node B (evolved NodeB, eNB), the device providing the base station function in the Wireless Local Area Network (WLAN) is an Access Point (AP), the device providing the base station function in the 5G system is a gNB, and an evolved node B (ng-eNB), the access network device 120 in the embodiment of the present disclosure further includes a device providing the base station function in a future new communication system, and the specific implementation manner of the access network device 120 in the embodiment of the present disclosure is not limited. The access network equipment may also include Home base stations (Home enbs, henbs), relays (Relay), Pico base stations Pico, etc.
The base station controller is a device for managing a base station, such as a Base Station Controller (BSC) in a 2G network, a Radio Network Controller (RNC) in a 3G network, and a device for controlling and managing a base station in a future new communication system.
The network in the embodiment of the present disclosure is a communication network providing a communication service for the terminal device 140, and includes a base station of a radio access network, a base station controller of the radio access network, and a device on the core network side.
The Core Network may be an Evolved Packet Core (EPC), a 5G Core Network (english: 5G Core Network), or a new Core Network in a future communication system. The 5G Core Network is composed of a set of devices, and implements Access and Mobility Management functions (AMF) of functions such as Mobility Management, User Plane Functions (UPF) providing functions such as packet routing forwarding and Quality of Service (QoS) Management, Session Management Functions (SMF) providing functions such as Session Management, IP address allocation and Management, and the like. The EPC may be composed of an MME providing functions such as mobility management, Gateway selection, etc., a Serving Gateway (S-GW) providing functions such as packet forwarding, etc., and a PDN Gateway (P-GW) providing functions such as terminal address allocation, rate control, etc.
It should be noted that, when the mobile communication system shown in fig. 1 adopts a 5G system or a 5G next generation mobile communication technology system, the above network elements may have different names in the 5G system or the 5G next generation mobile communication technology system, but have the same or similar functions, and the embodiment of the present disclosure is not limited thereto.
It should be noted that the receiver in the embodiment of the present disclosure is the access network device 120 or the terminal device 140. The embodiments of the present disclosure are not limited thereto.
Referring to fig. 2, a flowchart of a method for estimating a time offset according to an exemplary embodiment of the present disclosure is shown, which is illustrated in the mobile communication system shown in fig. 1. The method comprises the following steps.
Optionally, the receiver receives the frequency domain signal, and calculates to obtain a frequency domain channel estimate corresponding to the frequency domain signal.
Illustratively, the receiver multiplies the frequency domain signal by a pre-stored conjugate signal of the local sequence to obtain a frequency domain channel estimate.
Optionally, the frequency domain signal and the frequency domain channel estimate are both sequences having a plurality of values.
Optionally, the receiver selects the first frequency-domain data segment and the second frequency-domain data segment from the frequency-domain channel estimate. Wherein the first frequency domain data segment and the second frequency domain data segment are two data region segments in a frequency domain channel estimate.
There is a data overlap of the first frequency domain data segment with the second frequency domain data segment, or there is no data overlap of the first frequency domain data segment with the second frequency domain data segment. This embodiment is not limited thereto.
Optionally, the first frequency domain data section and the second frequency domain data section are two data sections having the same data amount. The frequency domain channel estimate is a sequence of N values, the first frequency domain data segment is a data segment of k values, and the second frequency domain data segment is a data segment of k values, where k is a positive integer less than N.
And the receiver calculates to obtain a time offset estimation value according to the phase relation between the time domain peaks respectively corresponding to the first frequency domain data section and the second frequency domain data section.
Optionally, the receiver calculates a time offset estimation value according to a phase difference between time domain peaks corresponding to the first frequency domain data segment and the second frequency domain data segment.
Optionally, the time offset estimation value is related to a phase difference between time domain peaks corresponding to the first frequency domain data segment and the second frequency domain data segment respectively. Illustratively, the time offset estimation value has a positive correlation with the phase difference, i.e., the larger the phase difference, the larger the time offset estimation value.
Optionally, after the receiver calculates the time offset estimation value, time offset compensation is performed on the received signal according to the time offset estimation value.
To sum up, in the embodiment of the present disclosure, a receiver obtains a frequency domain channel estimate corresponding to a received frequency domain signal; selecting a first frequency domain data section and a second frequency domain data section from the frequency domain channel estimation, wherein the first frequency domain data section and the second frequency domain data section are subsets of the frequency domain channel estimation; calculating to obtain a time offset estimation value according to the phase relation between the time domain peak values corresponding to the first frequency domain data section and the second frequency domain data section; the time offset estimation value is obtained by calculation according to the phase relation between the time domain peaks corresponding to the first frequency domain data section and the second frequency domain data section, so that the accurate reading of the estimation result is higher, the problem that the time offset estimation is more complex or has poorer effect in the related technology is solved, and the performance of the receiver is improved.
Referring to fig. 3, a flowchart of a method for estimating a time offset according to another exemplary embodiment of the present disclosure is shown, which is illustrated in the embodiment of using the method in the mobile communication system shown in fig. 1. The method comprises the following steps.
The receiver obtains frequency domain channel estimation corresponding to the received frequency domain signal.
Optionally, the receiver receives a time domain signal, and transforms the time domain signal into a frequency domain signal; and multiplying the frequency domain signal by a conjugate signal of a pre-stored local sequence to obtain frequency domain channel estimation.
Optionally, the receiver transforms the time domain signal into a frequency domain signal, including: the receiver performs fast Fourier transform (fft) processing on the time-domain signal to obtain a frequency-domain signal.
Illustratively, the receiver receives a time domain signal R, e.g., R ═ R0，r1……rN-1]. The receiver performs fft processing on the time domain signal through the following formula to obtain a frequency domain signal FR：
FR＝fft(R)
＝[f0，f1……fN-1]；
Illustratively, the receiver acquires a pre-stored local sequence FSE.g. FS＝[s0，s1……sN-1]. The receiver converts the frequency domain signal F by the following formulaRWith a pre-stored local sequence FSMultiplying the conjugate signals of (1) to obtain a frequency domain channel estimate X'corrThe method comprises the following steps:
X′corr＝[xc0，xc1……xcN-1]；
xci＝fi·conj(si)；i＝0，1，2……N-1；
where, conj () is a conjugate function, i is a positive integer whose initial value is 0, and N is a fft point number or an Inverse Fast Fourier Transform (ifft) point number.
Optionally, the time domain signal, the frequency domain signal and the frequency domain channel estimate are all sequences with N numbers of values.
Where N is the fft point number or the ifft point number. Optionally, the number of fft points is the same as the number of ifft points, and the number of fft points is determined according to a required frequency resolution, where the frequency resolution is used to indicate an interval between two closest signal frequencies obtained by fft processing analysis.
Wherein N is a positive integer greater than 1. Such as N being an integer power of 2. The present embodiment does not limit the specific value of N.
The receiver selects a first frequency-domain data segment and a second frequency-domain data segment from the frequency-domain channel estimate.
Optionally, the receiver obtains a preset selection parameter, and selects the first frequency domain data segment and the second frequency domain data segment from the frequency domain channel estimation according to the selection parameter.
Illustratively, the receiver estimates X 'from the frequency domain channel according to the selected parameter offset by'corrThe first frequency domain data segment X1 and the second frequency domain data segment X2 are selected:
X1＝[xc0，xc1……xcN-offset-1]；
X2＝[xcoffset，xcoffset+1……xcN-1]；
wherein the offset is a positive integer smaller than N, and the first frequency domain data segment X1 and the second frequency domain data segment X2 are both data segments having N-offset values. The specific value of the offset is not limited in this embodiment.
And the receiver respectively transforms the first frequency domain data section and the second frequency domain data section to a time domain for peak value search to obtain a first time domain peak value corresponding to the first time domain data section and a second time domain peak value corresponding to the second time domain data section.
Optionally, the receiver performs zero padding extension processing on the first frequency domain data segment and the second frequency domain data segment respectively to obtain an extended first frequency domain data segment and an extended second frequency domain data segment, where the extended first frequency domain data segment and the extended second frequency domain data segment are both data segments with N data, and N is a positive integer greater than 1; respectively carrying out fast Fourier inverse transformation on the expanded first frequency domain data section and the expanded second frequency domain data section to obtain a first time domain data section and a second time domain data section; and acquiring a first time domain peak value corresponding to the first time domain data section and a second time domain peak value corresponding to the second time domain data section.
Illustratively, the receiver performs zero padding extension processing on the first frequency domain data segment X1 to obtain an extended first frequency domain data segment X1-e, and performs zero padding extension processing on the second frequency domain data segment X2 to obtain an extended second frequency domain data segment X2-e, and the corresponding formula is as follows:
wherein the content of the first and second substances,
is offset, i.e.
Is a sequence with offset 0 s.
Illustratively, the receiver performs inverse fast fourier transform processing on the expanded first frequency domain data segment X1-e by the following formula to obtain a first time domain data segment X1corr(ii) a And performing fast Fourier transform processing on the expanded second frequency domain data section X2-e to obtain a second time domain data section X2corr：
X1corr＝ifft(X1_e)＝[x10，x11……x1N-1]；
X2corr＝ifft(X2_e)＝[x20，x21……x2N-1]；
Where ifft () is the inverse fast fourier transform function.
The receiver determines the time domain peak in the first time domain data segment as a first time domain peak and determines the time domain peak in the second time domain data segment as a second time domain peak.
Illustratively, the receiver obtains a first time domain peak X1 corresponding to the first time domain data segmentcorr(max _ idx) corresponds to the second time domain data segmentSecond time domain peak X2corr(max_idx)。
And 304, calculating to obtain a time offset estimation value according to the phase relation between the first time domain peak value and the second time domain peak value.
Optionally, the calculating, by the receiver, a time offset estimation value according to a phase relationship between the first time domain peak and the second time domain peak includes: the receiver acquires a phase difference between a first time domain peak value and a second time domain peak value; and calculating according to the phase difference to obtain a time offset estimation value.
In one possible implementation, the obtaining, by the receiver, a phase difference between the first time domain peak and the second time domain peak includes: the receiver calculates the phase difference according to the first time domain peak value and the second time domain peak value by the following formula
Wherein, X1corr(max _ idx) is the first time domain peak, X2corr(max _ idx) is the second time-domain peak, and angle () is the angle function.
In a possible implementation manner, the receiver obtains a time offset estimation value according to the phase difference calculation, including: according to the phase difference, a time bias estimation value to _ est is obtained through the following formula:
wherein the content of the first and second substances,
for the phase difference, N is the ift point number, and offset is the preset selection parameter. Optionally, N is an ifft point number or an fft point number.
Optionally, after the receiver calculates the time offset estimation value, the receiver compensates the time offset of the received time domain signal according to the time offset estimation value.
In one illustrative example, the simulation parameters include: the sampling bandwidth is 7.68MHz, the number of sampling points is 256 points, the number of fft points or ifft points is 256 points, and the offset is 20. The receiver performs time offset estimation by using the time offset estimation method in the related art and the time offset estimation method provided by the embodiment of the disclosure, and a schematic diagram of the obtained simulation data is shown in fig. 4. In fig. 4, the abscissa represents the signal-to-noise ratio (SNR) and the ordinate represents the Mean Squared Error (MSE). It can be seen from fig. 4 that the time offset estimation method provided by the embodiment of the present disclosure can obtain an accurate estimated value of the time offset estimation, the estimated expected value is 0, and as the signal-to-noise ratio increases, the estimated mean square error gradually converges to 0; however, the time offset estimation method in the related art is limited by the number of IFFT points, which results in insufficient estimation accuracy, and even if the signal-to-noise ratio is increased, the estimated mean square error cannot converge to a value of 0.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Please refer to fig. 5, which illustrates a schematic structural diagram of a time offset estimation apparatus according to an exemplary embodiment of the present disclosure. The time offset estimation apparatus can be implemented by a dedicated hardware circuit, or a combination of hardware and software, as all or a part of a receiver, and includes: an acquisition module 510, a selection module 520, and a calculation module 530.
An obtaining module 510, configured to obtain a frequency domain channel estimate corresponding to the received frequency domain signal;
a selecting module 520, configured to select a first frequency domain data segment and a second frequency domain data segment from the frequency domain channel estimation, where the first frequency domain data segment and the second frequency domain data segment are subsets of the frequency domain channel estimation;
a calculating module 530, configured to calculate a time offset estimation value according to a phase relationship between time domain peaks corresponding to the first frequency domain data segment and the second frequency domain data segment.
In a possible implementation manner, the calculating module 530 is further configured to respectively transform the first frequency domain data segment and the second frequency domain data segment to a time domain for peak search, so as to obtain a first time domain peak corresponding to the first frequency domain data segment and a second time domain peak corresponding to the second frequency domain data segment; and calculating to obtain a time offset estimation value according to the phase relation between the first time domain peak value and the second time domain peak value.
In another possible implementation manner, the calculating module 530 is further configured to:
respectively carrying out zero padding expansion processing on the first frequency domain data section and the second frequency domain data section to obtain an expanded first frequency domain data section and an expanded second frequency domain data section, wherein the expanded first frequency domain data section and the expanded second frequency domain data section are both data sections with N data, and N is a positive integer greater than 1;
respectively carrying out Inverse Fast Fourier Transform (IFFT) processing on the expanded first frequency domain data section and the expanded second frequency domain data section to obtain a first time domain data section and a second time domain data section;
and acquiring a first time domain peak value corresponding to the first time domain data section and a second time domain peak value corresponding to the second time domain data section.
In another possible implementation manner, the calculating module 530 is further configured to obtain a phase difference between the first time domain peak and the second time domain peak; and calculating according to the phase difference to obtain a time offset estimation value.
In another possible implementation manner, the calculating module 530 is further configured to calculate the phase difference according to the first time domain peak and the second time domain peak by the following formula
Wherein, X1corr(max _ idx) is the first time domain peak, X2corr(max _ idx) is the numberTwo time domain peaks, angle () are the angle function.
In another possible implementation manner, the calculating module 530 is further configured to calculate, according to the phase difference, a time offset estimation value to _ est by using the following formula:
wherein the content of the first and second substances,
for the phase difference, N is the ift point number, and offset is the preset selection parameter.
It should be noted that, when the apparatus provided in the foregoing embodiment implements the functions thereof, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed by different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to implement all or part of the functions described above. In addition, the apparatus and method embodiments provided by the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments for details, which are not described herein again.
An embodiment of the present disclosure further provides a receiver, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to perform the method performed by the receiver in the above-described method embodiments.
The disclosed embodiments also provide a non-transitory computer-readable storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the method performed by a receiver in the above-mentioned method embodiments is implemented.
The present disclosure may be systems, methods, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for causing a processor to implement various aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. A method of time offset estimation, for use in a receiver, the method comprising:
acquiring frequency domain channel estimation corresponding to the received frequency domain signal;
selecting a first frequency domain data segment and a second frequency domain data segment from the frequency domain channel estimates, the first frequency domain data segment and the second frequency domain data segment both being subsets of the frequency domain channel estimates;
and calculating to obtain a time offset estimation value according to the phase relationship between the time domain peaks corresponding to the first frequency domain data section and the second frequency domain data section, wherein the time offset estimation value is related to a phase difference and the number of IFFT points of the inverse fast Fourier transform, and the phase difference is the phase difference between the time domain peaks corresponding to the first frequency domain data section and the second frequency domain data section.
2. The method of claim 1, wherein calculating the time offset estimation value according to a phase relationship between time domain peaks corresponding to the first frequency domain data segment and the second frequency domain data segment comprises:
respectively transforming the first frequency domain data section and the second frequency domain data section to a time domain for peak value search to obtain a first time domain peak value corresponding to the first frequency domain data section and a second time domain peak value corresponding to the second frequency domain data section;
and calculating to obtain the time offset estimation value according to the phase relation between the first time domain peak value and the second time domain peak value.
3. The method of claim 2, wherein the transforming the first frequency domain data segment and the second frequency domain data segment to the time domain for peak search to obtain a first time domain peak corresponding to the first time domain data segment and a second time domain peak corresponding to the second time domain data segment comprises:
performing zero padding expansion processing on the first frequency domain data section and the second frequency domain data section respectively to obtain an expanded first frequency domain data section and an expanded second frequency domain data section, wherein the expanded first frequency domain data section and the expanded second frequency domain data section are both data sections with N data, and N is a positive integer greater than 1;
performing ifft processing on the expanded first frequency domain data section and the expanded second frequency domain data section respectively to obtain a first time domain data section and a second time domain data section;
and acquiring the first time domain peak value corresponding to the first time domain data section and the second time domain peak value corresponding to the second time domain data section.
4. The method of claim 3, wherein calculating the time offset estimate based on the phase relationship between the first time domain peak and the second time domain peak comprises:
acquiring a phase difference between the first time domain peak value and the second time domain peak value;
and calculating to obtain the time offset estimation value according to the phase difference.
5. The method of claim 4, wherein obtaining the phase difference between the first time domain peak and the second time domain peak comprises:
calculating the phase difference according to the first time domain peak value and the second time domain peak value by the following formula
Wherein, the X1corr(max _ idx) is the first time domain peak, X2corr(max _ idx) is the second time domain peak,the angle () is an angle function.
6. The method of claim 4, wherein said calculating the time offset estimate from the phase difference comprises:
and according to the phase difference, calculating the time bias estimation value to _ est by the following formula:
wherein, the
And the phase difference is obtained, the N is the ifft point number, and the offset is a preset selection parameter.
7. An apparatus for time offset estimation, for use in a receiver, the apparatus comprising:
an obtaining module, configured to obtain a frequency domain channel estimate corresponding to a received frequency domain signal;
a selecting module configured to select a first frequency domain data segment and a second frequency domain data segment from the frequency domain channel estimation, where the first frequency domain data segment and the second frequency domain data segment are subsets of the frequency domain channel estimation;
and the calculating module is used for calculating to obtain a time offset estimation value according to the phase relationship between the time domain peak values corresponding to the first frequency domain data section and the second frequency domain data section, wherein the time offset estimation value is related to the phase difference and the ifft point number, and the phase difference is the phase difference between the time domain peak values corresponding to the first frequency domain data section and the second frequency domain data section.
8. A receiver, characterized in that the receiver comprises:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
acquiring frequency domain channel estimation corresponding to the received frequency domain signal;
selecting a first frequency domain data segment and a second frequency domain data segment from the frequency domain channel estimates, the first frequency domain data segment and the second frequency domain data segment both being subsets of the frequency domain channel estimates;
and calculating to obtain a time offset estimation value according to the phase relation between the time domain peak values corresponding to the first frequency domain data section and the second frequency domain data section, wherein the time offset estimation value is related to the phase difference and the ifft point number, and the phase difference is the phase difference between the time domain peak values corresponding to the first frequency domain data section and the second frequency domain data section.
9. A non-transitory computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, implement the method of any of claims 1 to 6.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101945073A (en) * | 2009-07-03 | 2011-01-12 | 中兴通讯股份有限公司 | Pilot frequency-based time offset estimation device and method |
| CN102185822A (en) * | 2011-05-31 | 2011-09-14 | 电子科技大学 | OFDM/OQAM (Orthogonal Frequency Division Multiplexing/Offset Quadrature Amplitude Modulation) system and time frequency synchronization method thereof |
| CN102790737A (en) * | 2011-05-17 | 2012-11-21 | 中兴通讯股份有限公司 | Synchronization method and device of system |
| CN105282081A (en) * | 2014-06-27 | 2016-01-27 | 中兴通讯股份有限公司 | Carrier frequency offset estimation method and device |
-
2019
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101945073A (en) * | 2009-07-03 | 2011-01-12 | 中兴通讯股份有限公司 | Pilot frequency-based time offset estimation device and method |
| CN102790737A (en) * | 2011-05-17 | 2012-11-21 | 中兴通讯股份有限公司 | Synchronization method and device of system |
| CN102185822A (en) * | 2011-05-31 | 2011-09-14 | 电子科技大学 | OFDM/OQAM (Orthogonal Frequency Division Multiplexing/Offset Quadrature Amplitude Modulation) system and time frequency synchronization method thereof |
| CN105282081A (en) * | 2014-06-27 | 2016-01-27 | 中兴通讯股份有限公司 | Carrier frequency offset estimation method and device |
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