WO2019051758A1

WO2019051758A1 - Delay difference measurement method and apparatus, user equipment, and base station

Info

Publication number: WO2019051758A1
Application number: PCT/CN2017/101854
Authority: WO
Inventors: 周宝龙; 胡宏杰
Original assignee: 华为技术有限公司
Priority date: 2017-09-15
Filing date: 2017-09-15
Publication date: 2019-03-21

Abstract

Disclosed in embodiments of the present invention are a delay difference measurement method and apparatus, a user equipment, and a base station. In the method, a user equipment performs channel estimation on a measurement pilot sent by a base station, and obtains a frequency-domain response of the measurement pilot; then, the user equipment processes the frequency-domain response of the measurement pilot, and obtains power delay profiles of sending ports in the base station; then, the user equipment performs first path searches on the power delay profiles of the sending ports, and obtaining first paths of the sending ports; and finally, the user equipment determines a delay difference between a non-target sending port and a target sending port by computing a difference between a first path of the non-target sending port and a first path of the target sending port, so as to obtain delay differences among the sending ports. That is, by means of the delay difference measurement method disclosed in an embodiment of the present invention, delay differences among sending ports can be obtained, and accordingly, the problem in the prior art of failure to determine delay differences among sending ports by a user equipment is resolved.

Description

Delay difference measuring method, device, user equipment and base station

Technical field

The embodiments of the present invention relate to the field of communications technologies, and in particular, to a delay difference measurement method, apparatus, user equipment, and a base station.

Background technique

A multiple-input multiple-output (MIMO) system is a transmission port composed of a plurality of transmitting antennas at a transmitting end, and a receiving port composed of a plurality of receiving antennas at a receiving end. A system in which multiple transmit antennas and multiple receive antennas transmit information. Through the MIMO system, it is possible to make full use of space resources and improve communication quality, and thus has a wide range of applications in the field of mobile communications.

Among them, when using MIMO system to transmit information, precoding technology is usually adopted at present. In this technology, the base station sends measurement pilots to the user equipments through the respective sending ports, and after receiving the measurement pilots, the user equipment determines, according to the measurement pilots, a precoding matrix indicator (PMI) that matches each of the transmission channels. And then, the PMI is fed back to the base station; when the information needs to be sent to the user equipment, the base station performs precoding processing on the information to be sent by the PMI, and then transmits the pre-coded information to the user equipment through each sending port. Through precoding technology, it is possible to effectively suppress interference between multiple streams and increase system capacity.

However, in the research process of the embodiment of the present application, the inventor finds that when the base station sends measurement pilots to the user equipment through the respective sending ports, there are often different delays between the sending ports, that is, through the sending ports. When the transmitted measurement pilot arrives at the user equipment, there is a different delay difference. However, the user equipment cannot determine the delay difference, and the PMI determined by the user equipment is less matched with the actual transmission channel, and the performance of the precoding technology is degraded.

Summary of the invention

The embodiment of the present application provides a method, a device, a user equipment, and a base station for measuring a delay difference. In the prior art, when a base station sends a message to a user equipment by using a precoding technology, different delays often exist between the sending ports. And the user equipment cannot determine the problem of the delay difference.

In a first aspect, an embodiment of the present application provides a method for measuring a delay difference, including:

The user equipment performs channel estimation on the measurement pilot sent by the base station, and acquires a frequency domain response of the measurement pilot.

The user equipment processes the frequency domain response of the measurement pilot, and acquires a power delay spectrum of each transmission port in the base station;

The user equipment performs a first-path search on the power delay spectrum of each of the sending ports, and obtains a first path of each of the sending ports, where a first path of each sending port is multipath information sent by the sending port, The time when the user equipment is first reached;

The user equipment calculates a difference between a first path of the non-target sending port and a first path of the target sending port, where the difference is used as a delay difference between the non-target sending port and the target sending port, where the The target sending port is one of the base stations, and the non-target sending port is sent by the base station except the target. A port other than the port.

The delay difference measurement method disclosed in the embodiment of the present invention can obtain the delay difference between the transmission ports, thereby solving the problem that the user equipment cannot determine the delay difference of each transmission port in the prior art.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the user equipment processes a frequency domain response of the measurement pilot, and acquires a power delay spectrum of each sending port in the base station, including :

Performing an inverse fast Fourier transform on the frequency domain responses of the respective measurement pilots received through the same transmission channel to obtain a time domain impulse response of each of the receiving antennas;

Acquiring the power delay spectrum of each receiving antenna according to the time domain impulse response of each receiving antenna, and collecting an average value of the power delay spectrum of each receiving antenna, according to the power delay of each receiving antenna The average of the spectra, the power delay spectrum obtained by the energy normalization;

Non-coherently accumulating the energy-synchronized spectrum of the same set of measurement pilots, obtaining the accumulated result of each receiving antenna, and combining the accumulated results of the receiving antennas corresponding to the same transmitting port to obtain each transmission The result of the combination of the ports, wherein the measurement pilots received by the one receiving antenna from the same transmitting port are the same set of measurement pilots;

Performing in-phase filtering on the combined result of different subframes corresponding to the same sending port, and using the filtered result as the power delay spectrum of the transmitting port.

Through the foregoing steps, the power delay spectrum of each sending port can be obtained, so that the first path of each sending port is determined according to the power delay spectrum of each sending port.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the user equipment performs a first-path search on a power delay spectrum of each of the sending ports, and obtains a first path of each of the sending ports, including:

After obtaining the power delay spectrum of each of the sending ports, the power delay spectrum of each of the sending ports is periodically extended according to the number of pilot subcarriers;

Performing the strongest path search on the power delay spectrum after the period extension according to the preset strongest search window, and searching for the strongest path in the power delay spectrum after the period extension, wherein the strongest path The path is the position with the largest amplitude in the power delay spectrum;

Determining a first-path search window according to the most powerful path, and performing a first-path search on the power-delayed spectrum after the cycle extension according to the first-path search window to obtain a target position, where, if the first-path search is performed, To the power delay spectrum exceeding the preset first-path threshold, the position of the first power delay spectrum exceeding the preset first-path threshold is taken as the target position, and if the preset exceeds the preset a power delay spectrum of the path threshold, where the position of the strongest path is the target position;

The target position is adjusted according to a ratio of a sample period of the measurement pilot to a sample period of the OFDM symbol, and the adjusted position is used as a first path.

Through the above steps, the first path of each transmission port can be obtained.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the method further includes:

After searching for the strongest path in the power delay spectrum after the period extension, comparing the power delay spectrum corresponding to the strongest path with a preset maximum strong path threshold;

And if the power delay spectrum corresponding to the most strong path is greater than the preset maximum strong path threshold, performing the operation of determining the first path search window according to the strongest path.

With reference to the second possible implementation of the first aspect, in a fourth possible implementation manner of the first aspect, the ratio of the sample period according to the measurement pilot to the sample period of the OFDM symbol is The target position is adjusted, and the adjusted position is taken as the first path, including:

Calculating a product of the target position and the ratio, and using the position indicated by the product as a first path;

or,

_Advancing the target position by n _ahead sampling points to obtain a position after the advance, wherein n _ahead is a preset adjustment threshold;

The product after the advancement is calculated as the product of the ratio, and the position indicated by the product is taken as the first diameter.

With reference to the first aspect, in combination with the first possible implementation of the first aspect, in combination with the second possible implementation of the first aspect, in combination with the third possible implementation of the first aspect, combined with the fourth possible aspect of the first aspect The implementation manner, in the fifth possible implementation manner of the first aspect, further includes:

After acquiring the delay difference between the non-target sending port and the target sending port, transmitting the delay difference to the base station, so that after the base station receives the delay difference, each time delay is used according to the delay difference. The to-be-sent information of the transmitting port and the measurement pilot perform corresponding delay compensation.

Through the above steps, since the base station performs corresponding delay compensation on the to-be-sent information and the measurement pilot of each transmitting port, the user equipment can determine the PMI of the more matching transmission channel, thereby improving the algorithm performance of the pre-coding technique.

With reference to the first aspect, in combination with the first possible implementation of the first aspect, in combination with the second possible implementation of the first aspect, in combination with the third possible implementation of the first aspect, combined with the fourth possible aspect of the first aspect The implementation manner, in the sixth possible implementation manner of the first aspect, further includes:

After acquiring the delay difference between the non-target sending port and the target sending port, performing corresponding delay compensation on the received information sent by each sending port;

Determining the precoding matrix index PMI after the delay compensation according to the information after the delay compensation;

Transmitting the delay difference and the delay-compensated PMI to the base station, so that after the base station receives the delay difference and the delay-compensated PMI, the base station sends information to each sending port according to the delay difference. Or delay compensation for the information to be sent and the measurement pilot of each transmission port.

Through the foregoing steps, the base station can obtain the delay difference and the delay-compensated PMI, and the base station can perform delay compensation on the to-be-sent information of each sending port according to the delay difference, and obtain the delay-compensated to be sent. The information is pre-coded according to the PMI after the delay compensation, and the information to be transmitted after the measurement of the pilot and the delay is transmitted, and then the pre-coded measurement pilot and the information to be transmitted are transmitted to the user equipment. In this case, the pre-coded information obtained by the user equipment is compensated by delay, and the PMI used by the base station for pre-coding processing is also subjected to delay compensation, thereby improving the algorithm performance of the pre-coding technique.

Alternatively, after obtaining the delay difference and the delay-compensated PMI, the base station may delay the information to be sent of each sending port according to the delay difference, obtain the information to be sent after the delay compensation, and Performing delay compensation on the measurement pilot by the delay difference, acquiring the measurement pilot after the delay compensation, and then, according to the delay compensation, the PMI delays the information to be transmitted and the measurement pilot after the delay compensation. Perform precoding processing to transmit the pre-coded information to be transmitted and the measurement pilot to the user equipment. In this case, since the base station also performs delay compensation on the measurement pilot, the delay difference between the transmission ports calculated by the user equipment is smaller and smaller, so that the delay difference between the transmission ports is corrected. .

In a second aspect, the embodiment of the present application provides a method for measuring a delay difference, including:

The base station sends the measurement pilot to the user equipment through each sending port;

The base station receives a delay difference between the respective sending ports transmitted by the user equipment, where a delay difference between the respective sending ports is determined based on the measurement pilot.

Through the above steps, the base station can acquire the delay difference between the respective transmission ports.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes:

Performing corresponding delay compensation on the to-be-sent information and the measurement pilot of each transmitting port according to the delay difference;

Performing precoding processing on the information to be transmitted and the measurement pilot after the delay compensation, and acquiring the information after the precoding processing;

The pre-coded information is transmitted to the user equipment.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the method further includes:

After acquiring the PMI after the delay compensation of the user equipment, delaying the information about the to-be-sent information of each sending port according to the delay difference, and acquiring the information to be sent after the delay compensation;

Performing precoding processing on the measurement pilot and the information to be transmitted after the delay compensation according to the PMI after the delay compensation, and acquiring the information after the precoding processing;

The pre-coded information is transmitted to the user equipment.

Through the above steps, the pre-coded information acquired by the user equipment is compensated by delay, and the PMI used by the base station for pre-coding processing is also subjected to delay compensation, thereby improving the algorithm performance of the pre-coding technique.

With reference to the second aspect, in a third possible implementation manner of the second aspect, the method further includes:

After obtaining the delay-compensated PMI transmitted by the user equipment, performing delay compensation on the to-be-sent information and the measurement pilot of each transmitting port according to the delay difference, and acquiring the information to be sent and the delay after the delay compensation is obtained. Compensated measurement pilot;

Decoding the to-be-sent information after the delay compensation and the measurement pilot after the delay compensation according to the PMI after the delay compensation, and acquiring the pre-coded information;

The pre-coded information is transmitted to the user equipment.

Through the above steps, since the base station also performs delay compensation on the measurement pilot, the delay difference between the respective transmission ports calculated by the user equipment is smaller and smaller, so that the delay difference between the respective transmission ports is corrected.

In a third aspect, the embodiment of the present application provides a delay difference measuring device, including:

a channel estimation module, configured to perform channel estimation on a measurement pilot sent by the base station, and acquire a frequency domain response of the measurement pilot;

The response processing module is configured to process the frequency domain response of the measurement pilot to obtain a power delay spectrum of each of the sending ports in the base station;

a first path obtaining module, configured to perform a first path search on the power delay spectrum of each of the sending ports, and obtain a first path of each sending port, where a first path of each sending port is the sending port The time of the first multi-path information sent to the user equipment;

a delay difference calculation module, configured to calculate a difference between a first path of the non-target sending port and a first path of the target sending port, where the difference is used as a delay difference between the non-target sending port and the target sending port, The target sending port is one of the sending ports of the base station, and the non-target sending port is a sending port of the base station except the target sending port.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the response processing module includes:

a response acquiring unit, configured to perform inverse fast Fourier transform on a frequency domain response of each measurement pilot received through the same transmission channel, to obtain a time domain impulse response of each receiving antenna;

a normalization processing unit, configured to acquire a power delay spectrum of each of the receiving antennas according to a time domain impulse response of each of the receiving antennas, and collect an average value of the power delay spectrum of each of the receiving antennas, according to the foregoing An average value of the power delay spectrum of the receiving antenna, and a power-delayed power delay spectrum;

The accumulating unit is configured to non-coherently accumulate the energy-synchronized spectrum of the energy normalized by the same set of measurement pilots, obtain the accumulated result of each receiving antenna, and accumulate the received antennas corresponding to the same transmitting port. Merging, obtaining the combined result of each sending port, where the measurement pilots received by one receiving antenna from the same sending port are the same set of measuring pilots;

The in-phase filtering unit is configured to perform in-phase filtering on the combined result of different subframes corresponding to the same sending port, and use the filtered result as the power delay spectrum of the sending port.

With reference to the third aspect, in a second possible implementation manner of the third aspect, the first path obtaining module includes:

a period extension unit, configured to periodically extend a power delay spectrum of each of the sending ports according to the number of pilot subcarriers after acquiring the power delay spectrum of each of the sending ports;

The strongest path search unit is configured to perform the strongest path search on the power delay spectrum after the cycle extension according to the preset strongest search window, and find the strongest power delay spectrum after the cycle extension a path, wherein the strongest path is a position having the largest amplitude in the power delay spectrum;

a first path search unit, configured to determine a first path search window according to the most powerful path, and perform a first path search on the power delay spectrum after the cycle extension according to the first path search window to obtain a target position, where If the power delay spectrum exceeding the preset first-path threshold is found through the first-path search, the position of the first power delay spectrum exceeding the preset first-path threshold is taken as the target position, if not Finding a power delay spectrum exceeding a preset first-path threshold, and using the position where the strongest path is located as a target position;

The position adjustment unit is configured to adjust the target position according to a ratio of a sample period of the measurement pilot to a sample period of the OFDM symbol, and use the adjusted position as a first path.

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the method further includes:

a comparing unit, configured to: after finding the strongest path in the power delay spectrum after the period extension, compare the power delay spectrum corresponding to the strongest path with a preset maximum strong path threshold Comparison

And if the power delay spectrum corresponding to the strongest path is greater than the preset strongest path threshold, the first path searching unit is further mobilized to perform an operation of determining the first path search window according to the strongest path.

With the second possible implementation of the third aspect, in a fourth possible implementation manner of the third aspect, the location adjustment unit includes:

a first determining unit, configured to calculate a product of the target position and the ratio, and use the position indicated by the product as a first path;

or,

a position advancement unit, configured to advance the target position by n _ahead sampling points to obtain a position after advancement, wherein n _ahead is a preset adjustment threshold;

And a second determining unit, configured to calculate a product of the position after the advancement and the ratio, and use the position indicated by the product as the first path.

With reference to the third aspect, in combination with the first possible implementation manner of the third aspect, the second possible implementation manner of the third aspect, and the third possible implementation manner of the third aspect, combined with the fourth possible fourth aspect The implementation manner, in the fifth possible implementation manner of the third aspect, further includes:

a first transmission module, configured to: after acquiring a delay difference between the non-target transmission port and the target transmission port, transmit the delay difference to a base station, so that the base station receives the delay difference, according to the The delay difference performs corresponding delay compensation on the to-be-sent information and the measurement pilot of each transmitting port.

With reference to the third aspect, in combination with the first possible implementation manner of the third aspect, the second possible implementation manner of the third aspect, and the third possible implementation manner of the third aspect, combined with the fourth possible fourth aspect The implementation manner, in the sixth possible implementation manner of the third aspect, further includes:

a delay compensation module, configured to perform corresponding delay compensation on the information sent by each of the received sending ports after acquiring a delay difference between the non-target sending port and the target sending port;

a PMI determining module, configured to determine a precoding matrix index PMI after delay compensation according to the information after the delay compensation;

a second transmission module, configured to transmit, to the base station, the PMI after the delay difference and the delay compensation, so that after the base station receives the PMI after the delay difference and the delay compensation, according to the delay difference The information to be sent of each sending port or the delay to be compensated for the information to be sent and the measurement pilot of each transmitting port.

In a fourth aspect, the embodiment of the present application provides a delay difference measuring device, including:

a pilot sending module, configured to send a measurement pilot to the user equipment by using each sending port;

And a delay difference receiving module, configured to receive a delay difference between the respective sending ports that are transmitted by the user equipment, where a delay difference between the sending ports is determined based on the measurement pilot.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the method further includes:

a first time delay compensation module, configured to perform corresponding delay compensation on the to-be-sent information and the measurement pilot of each sending port according to the delay difference;

a first pre-coding processing module, configured to perform pre-coding processing on the information to be transmitted and the measurement pilot after the delay compensation, and obtain the information after the pre-coding processing;

The first information sending module is configured to transmit the pre-coded processed information to the user equipment.

With reference to the fourth aspect, in a second possible implementation manner of the fourth aspect, the method further includes:

The second time delay compensation module is configured to perform delay compensation on the to-be-sent information of each sending port according to the delay difference after acquiring the PMI after the delay of the delay of the transmission of the user equipment, and obtain the delay to be sent after the delay compensation is obtained. information;

a second pre-coding processing module, configured to perform pre-coding processing on the measurement pilot and the information to be transmitted after the delay compensation according to the PMI after the delay compensation, to obtain the information after the pre-coding processing;

The second information sending module is configured to transmit the pre-coded processed information to the user equipment.

With reference to the fourth aspect, in a third possible implementation manner of the fourth aspect, the method further includes:

The third delay compensation module is configured to perform delay compensation on the to-be-sent information and the measurement pilot of each sending port according to the delay difference after acquiring the PMI after the delay compensation of the user equipment, and obtain the delay After compensation The information to be transmitted and the measurement pilot after the delay compensation;

a third pre-coding processing module, configured to pre-code the to-be-sent information and the delay-compensated measurement pilot after the delay compensation according to the PMI after the delay compensation, and obtain the pre-coding process information;

The third information sending module is configured to transmit the pre-coded processed information to the user equipment.

In a fifth aspect, an embodiment of the present application provides a user equipment, including: a transceiver port, a processor, and a memory connected to the processor;

The transceiver port is configured to send and receive information to and from the base station, and transmit information received from the base station to the processor;

The memory stores instructions executable by the processor;

The processor is configured to obtain a packet transmitted by the transceiver port, and implement the delay difference measurement method according to any one of claims 1 to 7 by executing a program or an instruction stored in the memory.

In a sixth aspect, an embodiment of the present application provides a base station, including: a transceiver port, a processor, and a memory connected to the processor;

The transceiver port is configured to send and receive information to and from the user equipment, and transmit information received from the user equipment to the processor;

The memory stores instructions executable by the processor;

The processor is configured to obtain a packet transmitted by the transceiver port, and implement the delay difference measurement method according to any one of claims 8 to 11 by executing a program or an instruction stored in the memory.

In a seventh aspect, an embodiment of the present invention further provides a computer program product, comprising instructions for causing a computer to perform the method of the first aspect when the instruction is run on a computer.

In an eighth aspect, an embodiment of the present invention further provides a computer program product, comprising instructions for causing a computer to perform the method of the second aspect when the instruction is run on a computer.

In a ninth aspect, the embodiment of the present invention further provides a computer storage medium, where the computer storage medium may store a program, and when the program is executed, part or all of the embodiments of the delay difference measurement method provided by the first aspect may be implemented. step.

According to a tenth aspect, an embodiment of the present invention further provides a computer storage medium, where the computer storage medium may store a program, where the program may implement part or all of the embodiments of the delay difference measurement method provided by the second aspect. step.

The embodiment of the invention discloses a method, a device, a user equipment and a base station for measuring a delay difference. In the method, the base station sends a measurement pilot to the user equipment by using each of the sending ports; after receiving the measurement pilot, the user equipment performs channel estimation on the measurement pilot sent by the base station, and acquires a frequency domain response of the measurement pilot; The user equipment processes the frequency domain response of the measurement pilot, obtains a power delay spectrum of each transmission port in the base station, and performs a first path search on the power delay spectrum of each transmission port to obtain a first path of each transmission port; Finally, the user equipment determines the delay difference between the non-target sending port and the target sending port by calculating the difference between the first path of the non-target sending port and the first path of the target sending port, thereby obtaining a delay difference between the sending ports.

That is to say, by using the solution disclosed in the embodiment of the present invention, the delay difference between the sending ports can be obtained, thereby solving the problem that the user equipment cannot determine the delay difference of each sending port in the prior art.

DRAWINGS

1 is a schematic diagram of a workflow of a method for measuring a delay difference according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a working flow of acquiring a power delay spectrum of each transmitting port in a method for measuring a delay difference according to an embodiment of the present disclosure;

3 is a schematic diagram of a workflow for obtaining a first path of each sending port in a method for measuring a delay difference according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of another workflow for obtaining a first path of each transmission port in a method for measuring a delay difference according to an embodiment of the present invention; FIG.

FIG. 5 is a schematic diagram of a workflow for performing delay compensation in a method for measuring a delay difference according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of a workflow of another method for measuring a delay difference according to an embodiment of the present invention; FIG.

FIG. 7 is a schematic diagram of a workflow of another method for measuring a delay difference according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of a workflow of another method for measuring a delay difference according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a delay difference measuring device according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of still another delay difference measuring device according to an embodiment of the present invention.

Detailed ways

In order to solve the problem that the base station uses the pre-coding technology to send information to the user equipment in the prior art, there is a different delay between the sending ports, and the user equipment cannot determine the delay difference. Delay measurement method, device, user equipment and base station.

In the first embodiment of the present invention, a method of measuring a delay difference is disclosed. The method is applied to a user equipment, where the user equipment user includes each receiving port, and the receiving port is used to receive information sent by the base station through each sending port. Referring to the workflow diagram shown in FIG. 1, the delay difference measurement method disclosed in the embodiment of the present invention includes the following steps:

Step S11: The user equipment performs channel estimation on the measurement pilot sent by the base station, and acquires a frequency domain response of the measurement pilot.

The base station usually loads the measurement pilots in the subcarriers, and then transmits the subcarriers loaded with the measurement pilots to the user equipment through the respective sending ports, so that the user equipment acquires the measurement pilots transmitted by the respective sending ports.

In addition, in the channel estimation of the measurement pilot, a least square method (Least Square) (LS) may be used. Of course, other channel estimation methods may also be used, which are not limited in this embodiment of the present invention. Through channel estimation, the obtained channel estimation result is the frequency domain response of the measurement pilot.

Step S12: The user equipment processes the frequency domain response of the measurement pilot to obtain a power delay spectrum of each transmission port in the base station.

Step S13: The user equipment performs a first path search on the power delay spectrum of each of the sending ports, and obtains a first path of each sending port, where a first path of each sending port is a multipath sent by the sending port. The time at which the user equipment was first reached in the message.

Under the influence of multipath effect, the information sent by the sending port will become multipath information during the propagation, and the time when the multipath information arrives at the receiving port is different. The first path is the first information sent by a certain sending port. The time at which the port was received.

Step S14: The user equipment calculates a difference between a first path of the non-target sending port and a first path of the target sending port, where the difference is used as a delay difference between the non-target sending port and the target sending port, where , said The target sending port is one of the sending ports of the base station, and the non-target sending port is a sending port of the base station other than the target sending port.

The target sending port may be any one of a plurality of sending ports of the base station. Generally, in each of the sending ports of the base station, the sending port that first transmits the information to the user equipment (ie, the receiving antenna) is selected as the target sending port, and the first path of a certain sending port indicates the multipath sent by the sending port. In the information, the time when the user equipment first arrives, then the transmission port with the smallest first path is the transmission port that first sends the information to the user equipment. Therefore, the transmission port with the smallest first path is usually selected as the target transmission port. Among the respective transmission ports of the base station, other transmission ports than the target transmission port are used as non-target transmission ports.

After determining the target sending port, the difference between the first path of the non-target sending port and the first path of the target sending port is calculated, where the difference is the delay difference between the non-target sending port and the target sending port. Among them, the delay difference can be calculated by the following formula:

τ _j =N _Firstj -N _First1 ,j=2,3,...,N _Tx .

In the above formula, τ _j represents the delay difference between the non-target transmission port j and the target transmission port, N _First1 represents the first path of the target transmission port, N _Firstj represents the first path of the non-target transmission port j, and N _Tx represents the transmission port. Quantity.

In the embodiment of the present invention, a method for measuring a delay difference is disclosed in the step S11 to the step S14, in which the user equipment performs channel estimation on the measurement pilot transmitted by the base station, and acquires a frequency domain response of the measurement pilot. The frequency domain response of the measurement pilot is processed to obtain a power delay spectrum of each transmission port in the base station; the first path search is performed on the power delay spectrum of each transmission port, and the first path of each transmission port is obtained; The difference between the first path of the non-target sending port and the first path of the target sending port determines the delay difference between the non-target sending port and the target sending port, thereby obtaining the delay difference between the sending ports.

That is to say, the delay difference measurement method disclosed in the embodiment of the present invention can obtain the delay difference between the respective transmission ports, thereby solving the problem that the user equipment cannot determine the delay difference of each transmission port in the prior art.

In order to elaborate on how to obtain the power delay spectrum of each transmission port, as a refinement of the method of FIG. 1, the present invention discloses a second embodiment. In the second embodiment of the present invention, as shown in FIG. 2, the user equipment processes the frequency domain response of the measurement pilot, and acquires a power delay spectrum of each transmission port in the base station, including the following steps:

Step S21: Perform an Inverse Fast Fourier Transform (IFFT) on the frequency domain response of each measurement pilot received through the same transmission channel, and obtain a time domain impulse response of each receiving antenna.

In step S21, a transmission channel is a transmission channel between the transmission port and its corresponding receiving antenna. The frequency domain response of the measurement pilot is a channel estimation result obtained after performing channel estimation on the measurement pilot. If the channel estimation is based on Least Square (LS), the frequency domain response of the measurement pilot can be expressed as

When the base station sends the measurement pilot to the user equipment, the measurement pilot is usually loaded in the subcarrier, that is, the measurement pilot is distributed in multiple subframes, and each subframe is usually divided by multiple orthogonal frequency division multiplexing. (Orthogonal Frequency Division Multiplexing, OFDM) symbol composition. in

Where n _sf denotes the subframe number of each subframe in which the measurement pilot is distributed, i denotes that the number of the receiving antenna is i, and j denotes the number of the transmission port that transmits the measurement pilot.

Indicates the frequency domain response of the OFDM symbol on the kth pilot subcarrier where the first measurement pilot in the n _sf subframe received by the receiving antenna i receives the measurement pilot transmitted by the transmission port j. (ie channel estimation result). The pilot subcarrier is a subcarrier loaded with a measurement pilot in an OFDM symbol.

After receiving the information sent by the base station, the user equipment can obtain the frequency domain response of each measurement pilot through channel estimation. Then, the fast Fourier transform IFFT is performed on the frequency domain response according to the number of pilot subcarriers in the OFDM symbol. Wherein, the number of pilot subcarriers of the OFDM symbol is available.

Said that after

After performing the inverse fast Fourier transform, the obtained time domain impulse response is h _ij (n _sf , n, l), and h _ij (n _sf , n, l) represents the measurement guide transmitted when the receiving antenna i receives the transmission port j. The frequency domain time, the time domain impulse response of the OFDM symbol in the n _sf subframe received by the receiving antenna i in the time domain sampling point n, and the number of time domain sampling points n is

Step S22: Obtain a power delay spectrum of each receiving antenna according to a time domain impulse response of each receiving antenna, and collect an average value of power delay spectra of the respective receiving antennas, according to the receiving antennas of the respective receiving antennas. The average of the power delay spectrum is obtained from the energy-synchronized power delay spectrum.

Wherein, if the time domain impulse response is represented by h _ij (n _sf , n, l), the power delay spectrum of each receiving antenna can be obtained by:

γ _ij (n _sf , n, l) = h _ij (n _sf , n, l) * conj (h _ij (n _sf , n, l)). Where γ _ij (n _sf , n, l) represents that when the receiving antenna i receives the measurement pilot transmitted by the transmission port j, the OFDM symbol in which the first measurement pilot in the n _sf subframe received by the receiving antenna i is located is The power delay spectrum at time n sample point n.

Since the baseband received signal itself is strong and weak, in order to improve the accuracy of obtaining the power delay spectrum of each transmitting port, the power delay spectrum of each receiving antenna needs to be energy normalized. When performing energy normalization, the average value of the power delay spectrum of each receiving antenna is first counted. The average value of the power delay spectrum of each receiving antenna can be counted as follows:

among them,

Representing the power delay spectrum of the OFDM symbol of the first measurement pilot in the n _sf subframe received by the receiving antenna i at the time domain sampling point n when the receiving antenna i receives the measurement pilot transmitted by the transmission port j. average value.

Then, the operation of obtaining the energy-normalized power delay spectrum according to the average value of the power delay spectra of the respective receiving antennas can be realized by the following formula:

Where λ _ij (n _sf , n, l) represents that the first measurement pilot in the n _sf subframe received by the receiving antenna i is in the time domain sampling point when the receiving antenna i receives the measurement pilot transmitted by the transmission port j. The energy on the n normalizes the power delay spectrum.

Step S23: Perform non-coherent accumulation on the energy-synchronized spectrum of the energy normalized by the same set of measurement pilots, obtain the accumulated result of each receiving antenna, and combine the accumulated results of the receiving antennas corresponding to the same sending port. Obtaining the combined result of each sending port, wherein the measurement pilots received by one receiving antenna from the same sending port are the same set of measurement pilots.

If the energy-synchronized power delay spectrum is represented by λ _ij (n _sf , n, l), non-coherent accumulation can be performed by the following formula:

In the formula, λ _ij (n _sf , n) represents that when the receiving antenna i receives the measurement pilot transmitted by the transmission port j, the L measurement pilots corresponding to the n _sf subframe received by the reception antenna i are at the time domain point n. Non-coherent accumulation results.

After obtaining the accumulated results of the L measurement pilots of the respective receiving antennas, the accumulated results of the respective receiving antennas corresponding to the same transmitting port may be combined by the following formula:

Where λ _j (n _sf , n) represents the result of combining the measurement pilots corresponding to the n _sf subframes at the time domain point n when the transmission port j transmits the measurement pilot, and N _Rx is the receiving antenna corresponding to the transmission port j. The number.

Step S24: Perform in-phase filtering on the combined result of different subframes corresponding to the same sending port, and use the filtered result as the power delay spectrum of the sending port.

The in-phase filtering operation in step S24 generally obtains an in-phase filtered filter value by accumulating the combined result corresponding to the average N _fliter subframes in units of subframes. Specifically, in-phase filtering can be performed by the following formula:

The measurement pilot is composed of a plurality of subframes. In the above formula, n _sf represents the subframe number of each subframe constituting the measurement pilot, where n _sf =0, 1, 2, ..., N _filter -1, n=0,1,2,...,

And n denotes a time domain sampling point, j denotes a number of a transmission port transmitting a measurement pilot, and λ _av,j (n) denotes a power delay spectrum of the transmission port j.

Through the steps S21 to S24 of the second embodiment of the present invention, the power delay spectrum of each transmitting port can be obtained, so that the first path of each transmitting port is determined according to the power delay spectrum of each transmitting port.

In order to elaborate on how to obtain the first path of each transmission port, as a refinement of the method of FIG. 1, the present invention discloses a third embodiment. In the third embodiment of the present invention, as shown in FIG. 3, the user equipment performs a first-path search on the power delay spectrum of each of the sending ports, and obtains the first path of each of the sending ports, including the following steps:

Step S31: After acquiring the power delay spectrum of each transmitting port, according to the number of pilot subcarriers

The power delay spectrum of each of the sending ports is periodically extended.

In this step, the cycle extension can be performed by the following formula:

In the above formula,

Indicates the power delay spectrum of the transmission port j after the period extension.

Step S32: Perform a strongest path search on the power delay spectrum after the cycle extension according to the preset strongest search window, and find the strongest path in the power delay spectrum after the cycle extension, where The strongest path is the position with the largest amplitude in the power delay spectrum.

The most powerful search window can be expressed as:

among them,

Number of sampling points of the OFDM symbol, W _Max is the strongest path search window length is set in advance, the specific values W _Max is set by the skilled person based on application requirements.

After obtaining the strongest search window, the most powerful search is usually performed from left to right within the most powerful search window. Wherein, the strongest path is the position with the largest amplitude in the power delay spectrum. If the position of the strongest path is set to n ₀ , the power delay spectrum of the strongest path satisfies the formula:

Step S33, determining a first path search window according to the strongest path.

The first path search window determined according to the strongest path is usually expressed as:

Wherein, W _Left is a predetermined first route search window start parameter, W _Left particular value is set by the skilled person based on application requirements.

Step S34: Perform a first path search on the power delay spectrum after the period extension according to the first path search window, and determine whether a power delay spectrum exceeding a preset first path threshold is found. If yes, the operation of step S35 is performed, and if not, the operation of step S36 is performed.

In the above steps, after obtaining the first path search window, the first path search is usually performed from the heading in the first path search window.

In addition, the preset first path threshold can be passed

It means that the specific value is set by the technician according to the actual application requirements.

Step S35: If the first time path search is used, the power delay spectrum exceeding the preset first path threshold is found, and the position of the first power delay spectrum exceeding the preset first path threshold is used as the target position. Then, the operation of step S37 is performed.

In this case, set the time domain point of the target location to

Then you can get the following formula:

among them,

Indicates the preset first diameter threshold.

Step S36: If the first-path search is performed, the power delay spectrum exceeding the preset first-path threshold is not found, and the location where the strongest path is located is taken as the target position, and then the operation of step S37 is performed.

In this case, set the time domain point of the target location to

Then you can get the following formula:

Step S37: Adjust the target position according to a ratio of a sample period of the measurement pilot to a sample period of the OFDM symbol, and use the adjusted position as the first path.

In the embodiment of the present invention, since the measurement pilot only occupies part of the subcarriers, the sample period of the measurement pilot is not consistent with the sample period of the OFDM symbol, and the sample period and the OFDM symbol according to the measurement pilot need to be used. The ratio of the sample period is adjusted to the target position.

Wherein, the ratio of the sample period of the measurement pilot to the sample period of the OFDM symbol can be passed

Representing, wherein N _FFT represents a sample period of an OFDM symbol,

Indicates the number of pilot subcarriers.

Further, in step S37, the target position is adjusted according to a ratio of a sample period of the measurement pilot to a sample period of an OFDM symbol, and the adjusted position is used as a first path. Ways to achieve.

In one mode, the target position is adjusted according to a ratio of a sample period of the measurement pilot to a sample period of an OFDM symbol, and the adjusted position is used as a first path, including:

A product of the target position and the ratio is calculated, and a position indicated by the product is taken as a first diameter.

In another mode, for the robustness of the algorithm, the target position is adjusted according to the ratio of the sample period of the measurement pilot to the sample period of the OFDM symbol, and the adjusted Location as the first path, including:

The product after the advancement is calculated as the product of the ratio, and the position indicated by the product is taken as the first diameter. In this case, the position of the first path can be expressed by the following formula:

Among them, N _{First, j} represents the position of the first path.

Considering the error existing in the first path calculation process, in order to ensure the first path is obtained, the target position is advanced by n _ahead by the above steps. Among them, the specific value of n _ahead is determined by the technician according to actual needs.

In addition, the present invention also discloses a third embodiment. In the third embodiment of the present invention, as shown in FIG. 4, the user equipment performs a first-path search on the power delay spectrum of each of the sending ports, and acquires the first path of each of the sending ports, including the following steps:

Step S41: After acquiring the power delay spectrum of each transmitting port, according to the number of pilot subcarriers

The power delay spectrum of each of the sending ports is periodically extended.

Step S42: Perform a strongest path search on the power delay spectrum after the cycle extension according to the most powerful path search window set in advance, and search for the strongest path in the power delay spectrum after the cycle extension, where The strongest path is the position with the largest amplitude in the power delay spectrum.

The operation process of the step S41 to the step S42 is the same as the operation process of the step S31 to the step S32, and can be referred to each other, and details are not described herein again.

Step S43, after searching for the strongest path in the power delay spectrum after the period extension, comparing the power delay spectrum corresponding to the strongest path with a preset maximum strong path threshold. Determining whether the power delay spectrum corresponding to the strongest path is smaller than the preset maximum strength threshold. If not, performing the operation of step S44, and if yes, performing the operation of step S49.

Wherein the preset maximum strongest threshold can pass

Said.

Step S44: If the power delay spectrum corresponding to the strongest path is greater than the preset maximum strongest threshold, determine the first diameter search window according to the strongest path.

Step S45: Perform a first path search on the power delay spectrum after the period extension according to the first path search window, and determine whether a power delay spectrum exceeding a preset first path threshold is found. If yes, the operation of step S46 is performed, and if not, the operation of step S47 is performed.

Step S46: If the first time path search is used, the power delay spectrum exceeding the preset first path threshold is found, and the position of the first power delay spectrum exceeding the preset first path threshold is used as the target position. Then, the operation of step S48 is performed.

Step S47: If the first path search is performed, the power delay spectrum exceeding the preset first path threshold is not found, and The position where the strongest path is located is taken as the target position, and then the operation of step S48 is performed.

Step S48: Adjust the target position according to a ratio of a sample period of the measurement pilot to a sample period of the OFDM symbol, and use the adjusted position as the first path.

The operation process of the step S44 to the step S48 is the same as the operation process of the step S33 to the step S37, and can be referred to each other, and details are not described herein again.

Step S49: If the power delay spectrum corresponding to the strongest path is smaller than the preset maximum strength threshold, that is,

End this time difference difference measurement operation.

In addition, if the power delay spectrum corresponding to the strongest path is smaller than the preset maximum strength threshold, the detection failure identifier may also be output:

The operation indicating that the delay difference between the respective transmission ports is detected this time fails.

In the solution disclosed in the third embodiment of the present invention, after searching for the strongest path in the power delay spectrum after the period extension, the power delay spectrum corresponding to the strongest path is the strongest preset The path threshold is compared; if the power delay spectrum corresponding to the strongest path is not less than the preset maximum-threshold threshold, performing the operation of determining the first-path search window according to the strongest path If the power delay spectrum corresponding to the strongest path is smaller than the preset maximum strength threshold, it indicates that the power delay spectrum corresponding to the strongest path is small. In this case, the delay between each transmission port is detected. Poor operation failed.

Further, the method for measuring the delay difference disclosed in the embodiments of the present invention further includes:

In addition, referring to the workflow diagram shown in FIG. 5, the method for measuring the delay difference disclosed in the embodiments of the present invention further includes:

Step S51: After acquiring a delay difference between the non-target sending port and the target sending port, perform corresponding delay compensation on the received information sent by each sending port.

Step S52, determining, according to the information after the delay compensation, the precoding matrix index PMI after the delay compensation;

Step S53, transmitting, to the base station, the delay difference and the delay-compensated PMI, so that after the base station receives the delay difference and the delay-compensated PMI, the base station performs, according to the delay difference, each of the sending ports. The information to be transmitted or the delay to be compensated for the information to be transmitted and the measurement pilot of each transmission port.

After the base station delays the information to be sent or the information to be sent and the measurement pilot of each transmitting port according to the delay difference, the base station acquires the to-be-sent information after the delay compensation or obtains the delay compensation. The information to be transmitted and the measurement pilot are pre-coded according to the PMI after the delay compensation, or the information to be transmitted after the delay compensation, or the information to be transmitted and the measurement pilot after the delay compensation are pre-coded. deal with.

After acquiring the delay difference between the respective sending ports, the user equipment transmits the delay difference to the base station, and transmits the precoding matrix index PMI determined according to the measurement pilot transmitted by the base station to the base station. In this case, after receiving the delay difference between the sending ports, the base station performs corresponding delay compensation on the to-be-sent information and the measurement pilot of each sending port according to the delay difference, and then according to the PMI pair transmitted by the user equipment. The information to be transmitted and the measurement pilot after the delay compensation are subjected to precoding processing, and the pre-coded information to be transmitted and the measurement pilot are transmitted to the user equipment. In this solution, since the information sent by each sending port of the base station is compensated by the delay, and the measurement pilot received by the user equipment is also compensated by the delay, reducing the delay difference of the transmitting port leads to an increase in the frequency of the transmission channel. Phenomenon, the user equipment can determine the PMI that better matches the transport channel, thereby improving the pre-programming Algorithmic performance of code technology.

Further, after acquiring the delay difference between the sending ports, the user equipment may perform corresponding delay compensation on the received measurement pilots sent by the respective sending ports, and determine according to the measurement pilots after the delay compensation. The corresponding PMI. If the PMI determined by the measurement pilot after the delay compensation is referred to as the PMI after the delay compensation, the user equipment transmits the delay difference and the PMI after the delay compensation to the base station.

In this case, after receiving the delay difference and the delay-compensated PMI, the base station performs delay compensation on the information to be sent of each sending port according to the delay difference, and acquires information to be sent after delay compensation. And precoding the measurement pilot and the delay-compensated information according to the PMI after the delay compensation, and then transmitting the pre-coded measurement pilot and the to-be-sent information to the user equipment. In this solution, the pre-coded information obtained by the user equipment is compensated by delay, and the PMI used by the base station for pre-coding processing is also subjected to delay compensation, thereby improving the algorithm performance of the pre-coding technique.

Or, in another case, after receiving the delay difference and the delay-compensated PMI, the base station performs delay compensation on the to-be-sent information of each sending port according to the delay difference, and obtains delay compensation. The information to be transmitted is further compensated by the delay of the measurement pilot according to the delay difference, the measurement pilot after the delay compensation is obtained, and the information to be sent after the delay compensation is compensated by the PMI after the delay compensation And the measurement pilot after the delay compensation is pre-coded, and then the pre-coded information to be transmitted and the measurement pilot are transmitted to the user equipment. In this solution, the pre-coded information obtained by the user equipment is subjected to delay compensation, and the PMI used by the base station to perform precoding processing is also subjected to delay compensation, thereby improving the algorithm performance of the precoding technique. Further, since the base station also performs delay compensation on the measurement pilot, and the user equipment receives the measurement pilot, the delay difference of each transmission port is calculated according to the measurement pilot. In this case, the user equipment calculates the calculated delay. The delay difference between the transmission ports will become smaller and smaller, so that the delay difference between the transmission ports is corrected.

Correspondingly, the fourth embodiment of the present invention discloses a delay difference measuring method, which is applied to a base station, and the base station can send information to a user equipment through multiple sending ports.

Referring to the workflow diagram shown in FIG. 6, the delay difference measurement method disclosed in this embodiment includes the following steps:

Step S61: The base station sends the measurement pilot to the user equipment through each sending port.

After receiving the measurement pilots sent by the respective sending ports, the user equipment acquires the delay difference between the sending ports according to the solution disclosed in the foregoing embodiments.

Step S62: The base station receives a delay difference between the sending ports that are sent by the user equipment, where a delay difference between the sending ports is determined based on the measurement pilot.

After obtaining the delay difference between the sending ports, the user equipment feeds back the delay difference between the sending ports to the base station, so that the base station can also obtain the delay difference between the sending ports.

Further, the method for measuring the delay difference disclosed in the embodiment of the present invention further includes the following steps:

Step S63: After obtaining the PMI after the delay compensation of the user equipment, delaying the delay of the information to be sent of each sending port according to the delay difference, and acquiring the information to be sent after the delay compensation.

Step S64: Perform precoding processing on the measurement pilot and the information to be transmitted after the delay compensation according to the PMI after the delay compensation, and obtain the information after the precoding processing;

Step S65: The pre-coded information is transmitted to the user equipment.

In addition, the method for measuring the delay difference disclosed in the embodiment of the present invention further includes the following steps:

Step S66: After obtaining the PMI after the delay compensation of the user equipment transmission, delay compensation is performed on the to-be-sent information and the measurement pilot of each sending port according to the delay difference, and the information to be sent after the delay compensation is obtained. And the measurement pilot after the delay compensation;

Step S67: Perform pre-coding processing on the to-be-transmitted information after the delay compensation and the measurement pilot after the delay compensation according to the PMI after the delay compensation, and obtain the information after the pre-coding processing;

Step S68, transmitting the pre-coded information to the user equipment.

After acquiring the delay difference between the respective sending ports, the user equipment transmits the delay difference to the base station, and transmits the precoding matrix index PMI determined according to the measurement pilot transmitted by the base station to the base station. In this case, after receiving the delay difference between the sending ports, the base station performs corresponding delay compensation on the to-be-sent information and the measurement pilot of each sending port according to the delay difference, and then according to the PMI pair transmitted by the user equipment. The information to be transmitted and the measurement pilot after the delay compensation are subjected to precoding processing, and the pre-coded information to be transmitted and the measurement pilot are transmitted to the user equipment. In this solution, since the information sent by each sending port of the base station is compensated by the delay, and the measurement pilot received by the user equipment is also compensated by the delay, reducing the delay difference of the transmitting port leads to an increase in the frequency of the transmission channel. Phenomenon, the user equipment can determine the PMI that better matches the transport channel, thereby improving the algorithm performance of the precoding technique.

Correspondingly, in another embodiment of the present invention, a delay difference measuring device is disclosed, which is For details not disclosed in the examples, please refer to the corresponding method embodiments of the present invention. Referring to the structural diagram shown in FIG. 9, the delay difference measuring device includes: a channel estimation module 110, a response processing module 120, a first path acquisition module 130, and a delay difference calculation module 140.

The channel estimation module 110 is configured to perform channel estimation on the measurement pilot sent by the base station, and obtain a frequency domain response of the measurement pilot.

The response processing module 120 is configured to process the frequency domain response of the measurement pilot to obtain a power delay spectrum of each of the sending ports in the base station;

The first path obtaining module 130 is configured to perform a first path search on the power delay spectrum of each of the sending ports, and obtain a first path of each sending port, where a first path of each sending port is The time of the multipath information sent by the sending port to reach the user equipment first;

The delay difference calculation module 140 is configured to calculate a difference between a first path of the non-target sending port and a first path of the target sending port, where the difference is used as the non-target sending port and the target sending port. a delay, wherein the target sending port is one of the sending ports of the base station, and the non-target sending port is a sending port of the base station other than the target sending port.

The delay difference measuring device disclosed in the embodiment of the present invention can obtain the delay difference between the sending ports, thereby solving the problem that the user equipment cannot determine the delay difference of each transmitting port in the prior art.

In the delay difference measuring device disclosed in the embodiment of the present invention, the response processing module includes:

Further, in the delay difference measuring device disclosed in the embodiment of the present invention, the first path obtaining module includes:

Further, in the delay difference measuring device disclosed in the embodiment of the present invention, the method further includes:

Further, in the delay difference measuring device disclosed in the embodiment of the present invention, the position adjusting unit includes:

or,

Correspondingly, in another embodiment of the present invention, a delay difference measuring device is disclosed. For details not disclosed in the device embodiment of the present invention, refer to the corresponding method embodiment of the present invention. Referring to the structural diagram shown in FIG. 10, the delay difference measuring device includes: a pilot transmitting module 210 and a delay difference receiving module 220.

The pilot sending module 210 is configured to send a measurement pilot to the user equipment by using each sending port.

The delay difference receiving module 220 is configured to receive a delay difference between the sending ports that are sent by the user equipment, where a delay difference between the sending ports is determined based on the measurement pilot .

The third delay compensation module is configured to perform delay compensation on the to-be-sent information and the measurement pilot of each sending port according to the delay difference after acquiring the PMI after the delay compensation of the user equipment, and obtain the delay The compensated information to be transmitted and the measurement pilot after the delay compensation;

In the embodiment of the present invention, after acquiring the delay difference between the sending ports, the user equipment feeds back the delay difference between the sending ports to the base station, so that the base station can also obtain the time between the sending ports. Delay.

Correspondingly, an embodiment of the present invention further discloses a user equipment, where the user equipment includes: a transceiver port, a processor, and a memory connected to the processor;

The memory stores instructions executable by the processor;

The processor is configured to acquire a packet transmitted by the transceiver port, and execute a delay difference measurement method disclosed in the method embodiments disclosed in FIG. 1 to FIG. 5 by executing a program or an instruction stored in the memory. .

Correspondingly, an embodiment of the present invention further discloses a base station, where the base station includes: a transceiver port, a processor, and a memory connected to the processor;

The memory stores instructions executable by the processor;

The processor is configured to acquire a packet transmitted by the transceiver port, and execute a delay difference measurement method disclosed in the method embodiments disclosed in FIG. 6 to FIG. 8 by executing a program or an instruction stored in the memory. .

Embodiments of the present invention also provide a computer program product comprising instructions for causing a computer to perform the delay difference measurement method disclosed in the method embodiments disclosed in FIGS. 1 through 5 when the instructions are run on a computer.

Embodiments of the present invention also provide a computer program product comprising instructions for causing a computer to perform the delay difference measurement method disclosed in the method embodiments disclosed in FIGS. 6-8 when the instructions are run on a computer.

In a specific implementation, the embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium The program may be stored with a program that, when executed, may implement some or all of the steps in the delay difference measurement method in the method embodiments disclosed in FIGS. 1 through 5. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

In a specific implementation, the embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium can store a program, and when the program is executed, the delay difference measurement method in the method embodiments disclosed in FIG. 6 to FIG. 8 can be implemented. Some or all of the steps. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

It should be noted that the various components/steps described in the embodiments of the present application may be split into more components/steps according to the needs of the implementation, or two or more components/steps or partial operations of the components/steps may be combined into one. New components/steps to achieve the objectives of the present invention.

The above method according to the present invention can be implemented in hardware, firmware, or as software or computer code that can be stored in a recording medium such as a CD ROM, a RAM, a floppy disk, a hard disk, or a magneto-optical disk, or can be downloaded through a network. The computer code originally stored in a remote recording medium or non-transitory machine readable medium and to be stored in a local recording medium, whereby the methods described herein can be stored using a general purpose computer, a dedicated processor, or programmable or dedicated Such software processing on a recording medium of hardware such as an ASIC or an FPGA. It will be understood that a computer, processor, microprocessor controller or programmable hardware includes storage components (eg, RAM, ROM, flash memory, etc.) that can store or receive software or computer code, when the software or computer code is The processing methods described herein are implemented when the processor or hardware is accessed and executed. Moreover, when a general purpose computer accesses code for implementing the processing shown herein, the execution of the code converts the general purpose computer into a special purpose computer for performing the processing shown herein.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

A method for measuring a time difference difference, comprising:

The user equipment performs channel estimation on the measurement pilot sent by the base station, and acquires a frequency domain response of the measurement pilot.

The user equipment processes the frequency domain response of the measurement pilot, and acquires a power delay spectrum of each transmission port in the base station;

The user equipment performs a first-path search on the power delay spectrum of each of the sending ports, and obtains a first path of each of the sending ports, where a first path of each sending port is multipath information sent by the sending port, The time when the user equipment is first reached;

The user equipment calculates a difference between a first path of the non-target sending port and a first path of the target sending port, where the difference is used as a delay difference between the non-target sending port and the target sending port, where the The target sending port is one of the sending ports of the base station, and the non-target sending port is a sending port of the base station other than the target sending port.
The method for measuring a delay difference according to claim 1, wherein the user equipment processes the frequency domain response of the measurement pilot, and acquires a power delay spectrum of each transmission port in the base station, including:

Performing an inverse fast Fourier transform on the frequency domain responses of the respective measurement pilots received through the same transmission channel to obtain a time domain impulse response of each of the receiving antennas;

Acquiring the power delay spectrum of each receiving antenna according to the time domain impulse response of each receiving antenna, and collecting an average value of the power delay spectrum of each receiving antenna, according to the power delay of each receiving antenna The average of the spectra, the power delay spectrum obtained by the energy normalization;

Non-coherently accumulating the energy-synchronized spectrum of the same set of measurement pilots, obtaining the accumulated result of each receiving antenna, and combining the accumulated results of the receiving antennas corresponding to the same transmitting port to obtain each transmission The result of the combination of the ports, wherein the measurement pilots received by the one receiving antenna from the same transmitting port are the same set of measurement pilots;

Performing in-phase filtering on the combined result of different subframes corresponding to the same sending port, and using the filtered result as the power delay spectrum of the transmitting port.
The method for measuring a delay difference according to claim 1, wherein the user equipment performs a first-path search on the power delay spectrum of each of the sending ports, and obtains a first path of each of the sending ports, including:

After obtaining the power delay spectrum of each of the sending ports, the power delay spectrum of each of the sending ports is periodically extended according to the number of pilot subcarriers;

Performing the strongest path search on the power delay spectrum after the period extension according to the preset strongest search window, and searching for the strongest path in the power delay spectrum after the period extension, wherein the strongest path The path is the position with the largest amplitude in the power delay spectrum;

Determining a first-path search window according to the most powerful path, and performing a first-path search on the power-delayed spectrum after the cycle extension according to the first-path search window to obtain a target position, where, if the first-path search is performed, To the power delay spectrum exceeding the preset first-path threshold, the position of the first power delay spectrum exceeding the preset first-path threshold is taken as the target position, and if the preset exceeds the preset a power delay spectrum of the path threshold, where the position of the strongest path is the target position;

Calculating the target position according to a ratio of a sample period of the measurement pilot to a sample period of the OFDM symbol Line adjustment, the adjusted position as the first path.
The method of measuring a delay difference according to claim 3, further comprising:

After searching for the strongest path in the power delay spectrum after the period extension, comparing the power delay spectrum corresponding to the strongest path with a preset maximum strong path threshold;

And if the power delay spectrum corresponding to the most strong path is greater than the preset maximum strong path threshold, performing the operation of determining the first path search window according to the strongest path.
The method for measuring a delay difference according to claim 3, wherein the target position is adjusted according to a ratio of a sample period of the measurement pilot to a sample period of an OFDM symbol, and the adjustment is performed. The location as the first path includes:

Calculating a product of the target position and the ratio, and using the position indicated by the product as a first path;

or,

Advancing the target position by n ahead sampling points to obtain a position after the advance, wherein n ahead is a preset adjustment threshold;

The product after the advancement is calculated as the product of the ratio, and the position indicated by the product is taken as the first diameter.
The method for measuring a delay difference according to any one of claims 1 to 5, further comprising:

After acquiring the delay difference between the non-target sending port and the target sending port, transmitting the delay difference to the base station, so that after the base station receives the delay difference, each time delay is used according to the delay difference. The to-be-sent information of the transmitting port and the measurement pilot perform corresponding delay compensation.
The method for measuring a delay difference according to any one of claims 1 to 5, further comprising:

After acquiring the delay difference between the non-target sending port and the target sending port, performing corresponding delay compensation on the received information sent by each sending port;

Determining the precoding matrix index PMI after the delay compensation according to the information after the delay compensation;

Transmitting the delay difference and the delay-compensated PMI to the base station, so that after the base station receives the delay difference and the delay-compensated PMI, the base station sends information to each sending port according to the delay difference. Or delay compensation for the information to be sent and the measurement pilot of each transmission port.
A method for measuring a time difference difference, comprising:

The base station sends the measurement pilot to the user equipment through each sending port;

The base station receives a delay difference between the respective sending ports transmitted by the user equipment, where a delay difference between the respective sending ports is determined based on the measurement pilot.
The method of measuring a delay difference according to claim 8, further comprising:

Performing corresponding delay compensation on the to-be-sent information and the measurement pilot of each transmitting port according to the delay difference;

Performing precoding processing on the information to be transmitted and the measurement pilot after the delay compensation, and acquiring the information after the precoding processing;

The pre-coded information is transmitted to the user equipment.
The method of measuring a delay difference according to claim 8, further comprising:

After acquiring the PMI after the delay compensation of the user equipment, delaying the information about the to-be-sent information of each sending port according to the delay difference, and acquiring the information to be sent after the delay compensation;

Performing precoding processing on the measurement pilot and the information to be transmitted after the delay compensation according to the PMI after the delay compensation, and acquiring the information after the precoding processing;

The pre-coded information is transmitted to the user equipment.
The method of measuring a delay difference according to claim 8, further comprising:

After obtaining the delay-compensated PMI transmitted by the user equipment, performing delay compensation on the to-be-sent information and the measurement pilot of each transmitting port according to the delay difference, and acquiring the information to be sent and the delay after the delay compensation is obtained. Compensated measurement pilot;

Decoding the to-be-sent information after the delay compensation and the measurement pilot after the delay compensation according to the PMI after the delay compensation, and acquiring the pre-coded information;

The pre-coded information is transmitted to the user equipment.
A delay difference measuring device, comprising:

a channel estimation module, configured to perform channel estimation on a measurement pilot sent by the base station, and acquire a frequency domain response of the measurement pilot;

The response processing module is configured to process the frequency domain response of the measurement pilot to obtain a power delay spectrum of each of the sending ports in the base station;

a first path obtaining module, configured to perform a first path search on the power delay spectrum of each of the sending ports, and obtain a first path of each sending port, where a first path of each sending port is the sending port The time of the first multi-path information sent to the user equipment;

a delay difference calculation module, configured to calculate a difference between a first path of the non-target sending port and a first path of the target sending port, where the difference is used as a delay difference between the non-target sending port and the target sending port, The target sending port is one of the sending ports of the base station, and the non-target sending port is a sending port of the base station except the target sending port.
The delay difference measuring device according to claim 12, wherein the response processing module comprises:

a response acquiring unit, configured to perform inverse fast Fourier transform on a frequency domain response of each measurement pilot received through the same transmission channel, to obtain a time domain impulse response of each receiving antenna;

a normalization processing unit, configured to acquire a power delay spectrum of each of the receiving antennas according to a time domain impulse response of each of the receiving antennas, and collect an average value of the power delay spectrum of each of the receiving antennas, according to the foregoing An average value of the power delay spectrum of the receiving antenna, and a power-delayed power delay spectrum;

The accumulating unit is configured to non-coherently accumulate the energy-synchronized spectrum of the energy normalized by the same set of measurement pilots, obtain the accumulated result of each receiving antenna, and accumulate the received antennas corresponding to the same transmitting port. Merging, obtaining the combined result of each sending port, where the measurement pilots received by one receiving antenna from the same sending port are the same set of measuring pilots;

The in-phase filtering unit is configured to perform in-phase filtering on the combined result of different subframes corresponding to the same sending port, and use the filtered result as the power delay spectrum of the sending port.
The delay difference measuring device according to claim 13, wherein the first path obtaining module comprises:

a period extension unit, configured to periodically extend a power delay spectrum of each of the sending ports according to the number of pilot subcarriers after acquiring the power delay spectrum of each of the sending ports;

The strongest path search unit is configured to perform the strongest path search on the power delay spectrum after the cycle extension according to the preset strongest search window, and find the strongest power delay spectrum after the cycle extension Path, where the strongest The path is the position with the largest amplitude in the power delay spectrum;

a first path search unit, configured to determine a first path search window according to the most powerful path, and perform a first path search on the power delay spectrum after the cycle extension according to the first path search window to obtain a target position, where If the power delay spectrum exceeding the preset first-path threshold is found through the first-path search, the position of the first power delay spectrum exceeding the preset first-path threshold is taken as the target position, if not Finding a power delay spectrum exceeding a preset first-path threshold, and using the position where the strongest path is located as a target position;

The position adjustment unit is configured to adjust the target position according to a ratio of a sample period of the measurement pilot to a sample period of the OFDM symbol, and use the adjusted position as a first path.
The apparatus for measuring a delay difference according to claim 14, further comprising:

a comparing unit, configured to: after finding the strongest path in the power delay spectrum after the period extension, compare the power delay spectrum corresponding to the strongest path with a preset maximum strong path threshold Comparison

And if the power delay spectrum corresponding to the strongest path is greater than the preset strongest path threshold, the first path searching unit is further mobilized to perform an operation of determining the first path search window according to the strongest path.
The delay difference measuring device according to claim 14, wherein the position adjusting unit comprises:

a first determining unit, configured to calculate a product of the target position and the ratio, and use the position indicated by the product as a first path;

or,

a position advancement unit, configured to advance the target position by n ahead sampling points to obtain a position after advancement, wherein n ahead is a preset adjustment threshold;

And a second determining unit, configured to calculate a product of the position after the advancement and the ratio, and use the position indicated by the product as the first path.
The apparatus for measuring a delay difference according to any one of claims 12 to 16, further comprising:

a first transmission module, configured to: after acquiring a delay difference between the non-target transmission port and the target transmission port, transmit the delay difference to a base station, so that the base station receives the delay difference, according to the The delay difference performs corresponding delay compensation on the to-be-sent information and the measurement pilot of each transmitting port.
The apparatus for measuring a delay difference according to any one of claims 12 to 16, further comprising:

a delay compensation module, configured to perform corresponding delay compensation on the information sent by each of the received sending ports after acquiring a delay difference between the non-target sending port and the target sending port;

a PMI determining module, configured to determine a precoding matrix index PMI after delay compensation according to the information after the delay compensation;

a second transmission module, configured to transmit, to the base station, the PMI after the delay difference and the delay compensation, so that after the base station receives the PMI after the delay difference and the delay compensation, according to the delay difference The information to be sent of each sending port or the delay to be compensated for the information to be sent and the measurement pilot of each transmitting port.
A delay difference measuring device, comprising:

a pilot sending module, configured to send a measurement pilot to the user equipment by using each sending port;

And a delay difference receiving module, configured to receive a delay difference between the respective sending ports that are transmitted by the user equipment, where a delay difference between the sending ports is determined based on the measurement pilot.
The delay difference measuring device according to claim 19, further comprising:

a first delay compensation module, configured to send information and a measurement guide to each sending port according to the delay difference Perform corresponding delay compensation on the frequency;

a first pre-coding processing module, configured to perform pre-coding processing on the information to be transmitted and the measurement pilot after the delay compensation, and obtain the information after the pre-coding processing;

The first information sending module is configured to transmit the pre-coded processed information to the user equipment.
The delay difference measuring device according to claim 19, further comprising:

The second time delay compensation module is configured to perform delay compensation on the to-be-sent information of each sending port according to the delay difference after acquiring the PMI after the delay of the delay of the transmission of the user equipment, and obtain the delay to be sent after the delay compensation is obtained. information;

a second pre-coding processing module, configured to perform pre-coding processing on the measurement pilot and the information to be transmitted after the delay compensation according to the PMI after the delay compensation, to obtain the information after the pre-coding processing;

The second information sending module is configured to transmit the pre-coded processed information to the user equipment.
The delay difference measuring device according to claim 19, further comprising:

The third delay compensation module is configured to perform delay compensation on the to-be-sent information and the measurement pilot of each sending port according to the delay difference after acquiring the PMI after the delay compensation of the user equipment, and obtain the delay The compensated information to be transmitted and the measurement pilot after the delay compensation;

a third pre-coding processing module, configured to pre-code the to-be-sent information and the delay-compensated measurement pilot after the delay compensation according to the PMI after the delay compensation, and obtain the pre-coding process information;

The third information sending module is configured to transmit the pre-coded processed information to the user equipment.
A user equipment, comprising: a transceiver port, a processor, and a memory connected to the processor;

The transceiver port is configured to send and receive information to and from the base station, and transmit information received from the base station to the processor;

The memory stores instructions executable by the processor;

The processor is configured to obtain a packet transmitted by the transceiver port, and implement the delay difference measurement method according to any one of claims 1 to 7 by executing a program or an instruction stored in the memory.
A base station, comprising: a transceiver port, a processor, and a memory connected to the processor;

The transceiver port is configured to send and receive information to and from the user equipment, and transmit information received from the user equipment to the processor;

The memory stores instructions executable by the processor;

The processor is configured to obtain a packet transmitted by the transceiver port, and implement the delay difference measurement method according to any one of claims 8 to 11 by executing a program or an instruction stored in the memory.