CN108512713B - Method and device for calculating time delay - Google Patents
Method and device for calculating time delay Download PDFInfo
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- CN108512713B CN108512713B CN201710111003.6A CN201710111003A CN108512713B CN 108512713 B CN108512713 B CN 108512713B CN 201710111003 A CN201710111003 A CN 201710111003A CN 108512713 B CN108512713 B CN 108512713B
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Abstract
The embodiment of the invention relates to a method and a device for calculating time delay, wherein the method comprises the following steps: acquiring time domain channel response of each time slot of each antenna; calculating the time delay of each time slot according to the time domain channel response of each time slot of each antenna; and determining the reported time delay calculation result according to the time delay of each time slot. By the technical scheme of the embodiment of the invention, the accuracy of time delay estimation can be improved, and the performance of a communication system can be improved.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for calculating a time delay.
Background
The Long Term Evolution (LTE) technology is a Long Term Evolution result of Universal Mobile Telecommunications System (UMTS) technology standard established by The3rd Generation Partnership Project (3 GPP) organization. Orthogonal Frequency Division Multiplexing (OFDM) has attracted much attention as a high-speed transmission technology with high spectrum utilization efficiency and good multipath resistance.
A terminal (MS) sends a pilot signal to a Base Station (BS), the BS receives a channel response from the terminal to the BS, and the BS performs a delay measurement through the channel response. At present, the accuracy of a commonly used time delay estimation method is not high in a low signal-to-noise ratio and high-interference scene, and a larger time delay estimation deviation is easily caused.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for calculating time delay, and the method is used for improving the accuracy of time delay estimation and further improving the performance of a communication system.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method of calculating a time delay, the method comprising:
acquiring time domain channel response of each antenna in each time slot;
calculating the time delay of each time slot according to the time domain channel response of each time slot of each antenna;
and determining the reported time delay calculation result according to the time delay of each time slot.
Further, in the method for calculating a time delay, the determining a reported time delay calculation result according to the time delay of each time slot includes:
obtaining a time slot difference value according to the maximum value and the minimum value of the time delay of each time slot;
comparing the time slot difference value with a set threshold value, and if the time slot difference value is greater than the set threshold value, not reporting a time delay calculation result; if the time slot difference is not larger than the set threshold, reporting the average value of the time delay of each time slot.
Further, in the method for calculating a time delay, the obtaining a time domain channel response of each time slot of each antenna includes:
acquiring frequency domain channel response of each time slot of each antenna by using a pilot frequency receiving sequence;
and performing mathematical transformation on the frequency domain channel response of each time slot of each antenna to obtain the time domain channel response of each time slot of each antenna.
Further, in the method for calculating a time delay, the obtaining a frequency domain channel response of each time slot of each antenna by using a pilot frequency receiving sequence includes:
and acquiring the frequency domain channel response of each time slot of each antenna by using a pilot frequency receiving sequence and using a Least Square method (LS) or Minimum Mean Square Error (MMSE).
Further, in the method for calculating a time delay, the calculating a time delay of each time slot according to a time domain channel response of each time slot of each antenna includes:
calculating the power of the time domain channel response of each antenna in each time slot to obtain the total power of the time domain channel response in each time slot;
and calculating the time delay of each time slot according to the peak value of the total power of the time domain channel response of each time slot.
Furthermore, the present invention relates to a device for calculating a time delay, the device comprising:
the time domain channel response acquisition module is used for acquiring the time domain channel response of each time slot of each antenna;
a time slot delay calculation module, configured to calculate a time delay of each time slot according to a time domain channel response of each time slot of each antenna;
and the time delay reporting module is used for determining a reported time delay calculation result according to the time delay of each time slot.
Further, in the apparatus for calculating a time delay, the time domain channel response obtaining module includes:
a first obtaining unit, configured to obtain, by using a pilot receiving sequence, a frequency domain channel response of each time slot of each antenna;
and the second acquisition unit is used for performing mathematical transformation on the frequency domain channel response of each time slot of each antenna to acquire the time domain channel response of each time slot of each antenna.
Further, in the apparatus for calculating a time delay, the time slot time delay calculating module includes:
the first calculating unit is used for obtaining a time slot difference value according to the maximum value and the minimum value of the time delay of each time slot;
the first processing unit is used for comparing the time slot difference value with a set threshold value, and if the time slot difference value is larger than the set threshold value, the time delay calculation result is not reported; if the time slot difference is not larger than the set threshold, reporting the average value of the time delay of each time slot.
Further, in the apparatus for calculating a delay, the timeslot delay calculation module includes:
a second calculating unit, configured to calculate power of time domain channel response of each antenna in each time slot to obtain total power of time domain channel response in each time slot;
and the third calculating unit is used for calculating the time delay of each time slot according to the peak value of the total power of the time domain channel response of each time slot.
Further, in the apparatus for calculating a delay, the delay reporting module includes:
the comparison unit is used for comparing the time slot difference value with a set threshold value;
the second processing unit is used for not reporting the time delay calculation result when the time slot difference value is larger than the set threshold value; and when the time slot difference is not greater than the set threshold, reporting the average value of the time delay of each time slot.
The beneficial effects brought by the invention are as follows:
according to the method and the device for calculating the time delay, provided by the embodiment of the invention, the time delay of each time slot is calculated by acquiring the time domain channel response of each time slot of each antenna, so that the reported time delay calculation result is determined. The technical scheme of the embodiment of the invention can improve the accuracy of the time delay estimation and further improve the performance of the communication system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a method for calculating a time delay according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for calculating a time delay according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and the attached drawings. The described embodiments are only some, but not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a method for calculating a time delay, where the method includes:
s101, acquiring time domain channel response of each antenna in each time slot.
In the embodiment of the invention, the pilot frequency receiving sequence is utilized to further obtain the frequency domain channel response of each time slot of each antenna, and the frequency domain channel response of each time slot of each antenna is mathematically transformed, so that the time domain channel response of each time slot of each antenna is obtained.
And S102, calculating the time delay of each time slot according to the time domain channel response of each time slot of each antenna.
In the embodiment of the invention, the time-domain channel response power of each time slot of each antenna is calculated, then the power summation is carried out on all the antennas of each time slot to obtain the total power of the time-domain channel response of all the antennas of each time slot, and the time delay of each time slot is obtained by searching the peak value of the total power of the time-domain channel response of each antenna of each time slot.
And S103, determining a reported time delay calculation result according to the time delay of each time slot.
In the embodiment of the invention, the maximum value and the minimum value of all time slot time delay estimation are obtained according to the time delay of each time slot, and the reported time delay calculation result is determined.
Further, in the method for calculating a time delay, the determining a reported time delay calculation result according to the time delay of each time slot includes:
obtaining a time slot difference value according to the maximum value and the minimum value of the time delay of each time slot;
comparing the time slot difference value with a set threshold value, and if the time slot difference value is larger than the set threshold value, not reporting a time delay calculation result; and if the time slot difference is not larger than the time slot difference, reporting the average value of the time delay of each time slot.
In the embodiment of the present invention, it is assumed that the set threshold is 32Ts (time slot, ts), and the estimated time delays of the total two time slots are 16Ts and 32Ts, respectively. And reporting the average value 24Ts of the time delay estimation of each time slot according to the maximum value 32Ts and the minimum value 16Ts of the time delay estimation of each time slot and the difference value between the maximum value and the minimum value of the time delay estimation of each time slot is 16Ts, wherein the numerical value is not more than the set threshold value 32Ts.
Assuming that the threshold is set to be 32Ts, the estimated time delays of a total of two time slots are 16Ts and 48Ts respectively. And reporting the average value 32Ts of the time delay estimation of each time slot according to the maximum value 48Ts and the minimum value 16Ts of the time delay estimation of each time slot and the difference value between the maximum value and the minimum value of the time delay estimation of each time slot is 32Ts, wherein the numerical value is not more than the set threshold value 32Ts.
Assuming that the threshold is set to be 16Ts, the estimated time delays of a total of two time slots are 16Ts and 48Ts respectively. And according to the maximum value 48Ts and the minimum value 16Ts of each time slot time delay estimation, the difference value of the maximum value and the minimum value of each time slot time delay estimation is 32Ts, and if the value is greater than the set threshold value 16Ts, the time delay calculation result is not reported.
Further, in the method for calculating a time delay, the obtaining a time domain channel response of each time slot of each antenna includes:
acquiring frequency domain channel response of each time slot of each antenna by using a pilot frequency receiving sequence;
and performing mathematical transformation on the frequency domain channel response of each time slot of each antenna to obtain the time domain channel response of each time slot of each antenna.
Further, in the method for calculating a time delay, the obtaining a frequency domain channel response of each time slot of each antenna by using a pilot frequency receiving sequence includes:
and acquiring the frequency domain channel response of each time slot of each antenna by using a pilot frequency receiving sequence and using a Least Square (LS) method or a Minimum Mean Square Error (MMSE).
Further, in the method for calculating a time delay, the calculating a time delay of each time slot according to a time domain channel response of each time slot of each antenna includes:
calculating the power of the time domain channel response of each antenna in each time slot to obtain the total power of the time domain channel response in each time slot;
and calculating the time delay of each time slot according to the peak value of the total power of the time domain channel response of each time slot.
Based on the same inventive concept, the embodiment of the present invention further provides a device for calculating a time delay, and since the principle of the device for calculating a time delay to solve the problem is similar to the method for calculating a time delay in fig. 1 in the embodiment of the present invention, the implementation of the device for calculating a time delay may refer to the implementation of the method, and repeated parts are not described again.
An embodiment of the present invention further provides a device for calculating a time delay, as shown in fig. 2, where the device for calculating a time delay includes:
a time domain channel response obtaining module 210, where the time domain channel response obtaining module 210 is configured to obtain a time domain channel response of each time slot of each antenna;
a time slot delay calculating module 220, where the time slot delay calculating module 220 is configured to calculate a time delay of each time slot according to a time domain channel response of each time slot of each antenna;
a delay reporting module 230, where the delay reporting module 230 is configured to determine a reported delay calculation result according to the delay of each timeslot.
Further, in the apparatus for calculating a time delay, the time domain channel response obtaining module 210 includes:
a first obtaining unit 211, where the first obtaining unit 211 is configured to obtain a frequency domain channel response of each time slot of each antenna by using a pilot receiving sequence;
a second obtaining unit 212, where the second obtaining unit 212 is configured to perform mathematical transformation on the frequency domain channel response of each time slot of each antenna, and obtain the time domain channel response of each time slot of each antenna.
Further, in the apparatus for calculating a delay, the timeslot delay calculation module 220 includes:
a first calculating unit 221, where the first calculating unit 221 is configured to obtain a time slot difference according to a maximum value and a minimum value of the time delay of each time slot;
a first processing unit 222, where the first processing unit 222 is configured to compare the time slot difference with a set threshold, and if the time slot difference is greater than the set threshold, not reporting a delay calculation result; and if the time slot difference is not larger than the set threshold, reporting the average value of the time delay of each time slot.
Further, in the apparatus for calculating a delay, the timeslot delay calculation module 220 includes:
a second calculating unit 223, where the second calculating unit 223 is configured to calculate power of time domain channel response of each antenna in each time slot, so as to obtain total power of time domain channel response in each time slot;
a third calculating unit 224, where the third calculating unit 224 is configured to calculate the time delay of each time slot according to a peak value of the total power of the time domain channel response of each time slot.
Further, in the apparatus for calculating a delay, the delay reporting module 230 includes:
a comparing unit 231 for comparing the time slot difference value with a set threshold;
a second processing unit 232, configured to not report the time delay calculation result when the time slot difference is greater than the set threshold; and when the time slot difference is not greater than the set threshold, reporting the average value of the time delay of each time slot.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the above-mentioned processes do not imply an order of execution, and the order of execution of the processes should be determined by their functions and inherent logic, and should not limit the implementation process of the embodiments of the present invention in any way.
Additionally, the terms "system" and "network" are often used interchangeably herein.
It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network-side device) to perform some steps of the transceiving method according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be taken in any way as limiting the invention. Any modification or variation of the present invention made within the spirit of the same invention should still be included in the scope of the intended protection of the present invention.
Claims (8)
1. A method of calculating a time delay, the method comprising:
acquiring time domain channel response of each time slot of each antenna; the time domain channel response of each time slot of each antenna is acquired based on a pilot frequency receiving sequence;
calculating the time delay of each time slot according to the time domain channel response of each time slot of each antenna;
determining a reported time delay calculation result according to the time delay of each time slot, wherein the determining the reported time delay calculation result according to the time delay of each time slot comprises the following steps: obtaining a time slot difference value according to the maximum value and the minimum value of the time delay of each time slot; comparing the time slot difference value with a set threshold value, and if the time slot difference value is larger than the set threshold value, not reporting a time delay calculation result; if the time slot difference is not larger than the set threshold, reporting the average value of the time delay of each time slot.
2. The method of claim 1, wherein the obtaining the time domain channel response of each antenna in each time slot comprises:
acquiring frequency domain channel response of each time slot of each antenna by using a pilot frequency receiving sequence;
and performing mathematical transformation on the frequency domain channel response of each time slot of each antenna to obtain the time domain channel response of each time slot of each antenna.
3. The method of claim 2, wherein the obtaining the frequency domain channel response of each time slot of each antenna by using the pilot receiving sequence comprises:
and acquiring the frequency domain channel response of each time slot of each antenna by using a pilot frequency receiving sequence and a least square method or a minimum mean square error method.
4. The method of claim 1, wherein the calculating the time delay of each time slot according to the time domain channel response of each time slot of each antenna comprises:
calculating the power of the time domain channel response of each antenna in each time slot to obtain the total power of the time domain channel response in each time slot;
and calculating the time delay of each time slot according to the peak value of the total power of the time domain channel response of each time slot.
5. An apparatus for calculating a time delay, the apparatus comprising:
the time domain channel response acquisition module is used for acquiring the time domain channel response of each time slot of each antenna; the time domain channel response of each antenna time slot is obtained based on a pilot frequency receiving sequence;
a time slot delay calculation module, configured to calculate a time delay of each time slot according to a time domain channel response of each time slot of each antenna;
a time delay reporting module, configured to determine a reported time delay calculation result according to the time delay of each time slot, where the time slot time delay calculation module includes:
the first calculating unit is used for obtaining a time slot difference value according to the maximum value and the minimum value of the time delay of each time slot;
the first processing unit is used for comparing the time slot difference value with a set threshold value, and if the time slot difference value is greater than the set threshold value, the time delay calculation result is not reported; and if the time slot difference is not larger than the set threshold, reporting the average value of the time delay of each time slot.
6. The apparatus for calculating delay of claim 5, wherein the time domain channel response obtaining module comprises:
a first obtaining unit, configured to obtain, by using a pilot receiving sequence, a frequency domain channel response of each time slot of each antenna;
and a second obtaining unit, configured to perform mathematical transformation on the frequency domain channel response of each time slot of each antenna, so as to obtain a time domain channel response of each time slot of each antenna.
7. The apparatus for calculating delay of claim 5, wherein the time slot delay calculating module comprises:
a second calculating unit, configured to calculate power of time domain channel response of each antenna in each time slot, to obtain total power of time domain channel response in each time slot;
and the third calculating unit is used for calculating the time delay of each time slot according to the peak value of the total power of the time domain channel response of each time slot.
8. The apparatus for calculating delay of claim 5, wherein the delay reporting module comprises:
the comparison unit is used for comparing the time slot difference value with a set threshold value;
the second processing unit is used for not reporting the time delay calculation result when the time slot difference value is larger than the set threshold value; and when the time slot difference is not greater than the set threshold, reporting the average value of the time delay of each time slot.
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| CN101635695B (en) * | 2008-07-22 | 2012-12-05 | 电信科学技术研究院 | Method and device for determining maximum multipath time delay |
| WO2011157134A2 (en) * | 2011-05-31 | 2011-12-22 | 华为技术有限公司 | Interference detection between base stations and base station |
| CN102307167B (en) * | 2011-09-22 | 2015-02-04 | 京信通信系统（中国）有限公司 | Method and device for adjusting uplink timing advance and base station system |
| CN103457885B (en) * | 2012-05-31 | 2016-09-14 | 华为技术有限公司 | Channel estimation methods, channel estimating apparatus and receiver |
| CN104467939B (en) * | 2014-12-25 | 2018-02-09 | 中科创达软件股份有限公司 | A kind of method and device for optimizing multiple antennas and receiving |
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