WO2017177755A1

WO2017177755A1 - Method and apparatus for merging antenna data for time delay channel

Info

Publication number: WO2017177755A1
Application number: PCT/CN2017/073215
Authority: WO
Inventors: 吴昊; 李军; 李�杰; 傅强
Original assignee: 中兴通讯股份有限公司
Priority date: 2016-04-14
Filing date: 2017-02-10
Publication date: 2017-10-19
Also published as: CN107302392A; CN107302392B

Abstract

The present invention provides a method and apparatus for merging antenna data for a time delay channel. The method comprises: obtaining a sounding reference signal (SRS) sent by a user equipment (UE); obtaining a channel response according to the SRS, a channel time delay corresponding to the channel response, and a time delay expansion; adjusting a granularity of channel estimation according to the time delay expansion, and obtaining the adjusted granularity of the channel estimation; performing time delay compensation on the channel response according to the adjusted granularity of the channel estimation and the channel time delay, and obtaining the channel response after the time delay compensation; and compensating received antenna data according to the channel response after the time delay compensation, and merging the compensated antenna data. By means of the solution, a computing amount of a data merging process can be changed, so that a computing process be more easily implemented, thereby improving the whole performance of a communication system.

Description

Method and device for merging antenna data under time delay channel

The present application is based on a Chinese patent application filed on Jan. 14, 2016, the entire disclosure of which is hereby incorporated by reference.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a method and apparatus for combining antenna data under a delay channel.

Background technique

In order to combat the effects of fading in mobile communications, diversity reception is one of the effective measures that are often employed. In a mobile environment, multiple signals received through different channels have different fading conditions. The fading of mobile wireless signals includes two aspects: one from the shadow fading caused by the terrain, so that the average power of the received signal fluctuates in a longer space or time; one from multipath propagation makes the signal in a shorter time The signal intensity changes sharply over the distance.

Receiving a moving wireless signal over a short distance, the signal fading is independent in time, frequency, space, angle, and polarization. Using these features, a corresponding method can be used to obtain multiple signals with independent fading. After obtaining multiple fading independent signals, they need to be combined. The effect of the combination is to add the individual branch signals after phase adjustment and delay, so that the signal to noise ratio is improved. In the case of information transmission, when the channel delay or the delay spread is large, the phase between the carriers varies greatly, and the antenna needs to be compensated at a higher granularity, which increases the computational complexity of the system and the complexity of the system. Sex is not conducive to the improvement of the overall performance of the communication system.

Summary of the invention

The invention provides a method and a device for combining antenna data under a time delay channel, and solves the problem that the calculation amount and complexity of the system increase when the channel delay or the delay spread is large.

In order to solve the above technical problem, the present invention adopts the following technical solutions:

In one aspect, the present invention provides a method for merging antenna data under a time delay channel, including:

Obtaining an SRS (Sounding Reference Signal) sent by a User Equipment (UE);

Obtaining, according to the SRS, a channel response, a channel delay corresponding to the channel response, and a delay extension;

Adjusting a granularity of the channel estimation according to the delay extension, and obtaining an adjusted channel estimation granularity;

And performing delay compensation on the channel response according to the adjusted channel estimation granularity, and obtaining a channel response after delay compensation according to the channel delay;

And receiving the compensated antenna data according to the channel response after the delay compensation, and combining the compensated antenna data.

Optionally, the adjusting the granularity of the channel estimation according to the delay extension, and obtaining the adjusted channel estimation granularity, including:

Adjust the granularity of the channel estimation according to the following formula to obtain the adjusted channel estimation granularity:

l=f(TA2)

Where TA2 represents delay spread, f is an inverse proportional function, and l is the adjusted channel estimation granularity.

Optionally, according to the adjusted channel estimation granularity, performing delay compensation on the channel response according to the channel delay, and obtaining a channel response after delay compensation, including:

Determining, according to the adjusted channel estimation granularity, a carrier index k corresponding to the channel response under each of the adjusted channel estimation granularities;

The channel response is subjected to delay compensation according to the following formula, and the channel response after delay compensation is obtained:

Wherein, TA1 represents a channel delay, ka _Rx represents an antenna index, H(k, ka _Rx ) represents a channel response corresponding to the kth _Rx antenna on the kth carrier, and j represents an imaginary unit, H'(k, ka _Rx ) Indicates the channel response after delay compensation.

Optionally, the performing, according to the channel response after the delay compensation, compensating the received antenna data, including:

The received antenna data is compensated according to the following formula to obtain compensated antenna data:

Y'(k,ka _Rx )=H' ^* (k,ka _Rx )*Y(k,ka _Rx )

Where H' ^* (k, ka _Rx ) represents the conjugate of the channel response after the delay compensation, and Y(k, ka _Rx ) represents the antenna data received by the ka _rx antennas corresponding to the kth carrier. Y'(k, ka _Rx ) represents the compensated antenna data.

In another aspect, the present invention also provides an apparatus for combining antenna data under a delay channel, including:

a signal acquisition module, configured to acquire a sounding reference signal SRS sent by the user equipment UE;

a parameter obtaining module, configured to acquire, according to the SRS, a channel response, and a channel corresponding to the channel response Delay and extension;

a granularity adjustment module, configured to adjust a granularity of the channel estimation according to the delay extension, and obtain an adjusted channel estimation granularity;

a delay compensation module, configured to perform delay compensation on the channel response according to the adjusted channel estimation granularity according to the channel delay, and obtain a channel response after delay compensation;

The antenna data processing module is configured to compensate the received antenna data according to the channel response after the delay compensation, and combine the compensated antenna data.

Optionally, the granularity adjustment module is specifically configured to:

l=f(TA2)

Optionally, the delay compensation module is specifically configured to:

Optionally, the antenna data processing module is specifically configured to:

Y'(k,ka _Rx )=H' ^* (k,ka _Rx )*Y(k,ka _Rx )

Where H' ^* (k, ka _Rx ) represents the conjugate of the channel response after the delay compensation, and Y(k, ka _Rx ) represents the antenna data received by the ka _rx antennas corresponding to the kth carrier. _{, Y '(k, ka Rx} ) an antenna compensated data.

The beneficial effects of the invention are:

In the foregoing solution, the channel response, the channel delay, and the delay extension are obtained through the SRS, and then the granularity of the channel estimation is adjusted according to the delay spread, and then the channel response is compensated for delay under the adjusted granularity, and finally passed. The conjugate of the channel response after delay compensation compensates the antenna data, and finally the merging of the compensated antenna data can change the calculation amount of the data merging process, making the calculation process easier to implement, thereby improving the overall performance of the communication system. .

DRAWINGS

Figure 1 is a flow chart showing the first embodiment of the present invention;

Fig. 2 is a block diagram showing the module in the second embodiment of the present invention.

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been shown in the drawings, the embodiments Rather, these embodiments are provided so that this disclosure will be more fully understood and the scope of the disclosure will be fully disclosed.

First embodiment

The invention discloses a method for combining antenna data under a time delay channel, and the method is mainly directed to a data transmission process in an orthogonal frequency division multiplexing system, the method comprising:

Step 101: Acquire a sounding reference signal SRS sent by the user equipment UE.

The sounding reference signal SRS is a known signal that is provided by the signal transmitting end to the signal receiving end for channel estimation or channel sounding.

Step 102: Acquire, according to the SRS, a channel response, a channel delay corresponding to the channel response, and a delay extension.

Here, the channel response is obtained by using the received SRS signal, using LS (Least Square) channel estimation or MMSE (Minimum Mean Square Error) channel estimation, and the channel delay can be estimated by the obtained channel response. Delay spread, which belongs to the prior art, will not be described in detail herein. Specifically, the channel response is expressed as a row corresponding carrier index, and the column corresponds to a matrix of antenna indexes, the dimensions of which are the total number of carriers × the total number of antennas.

Step 103: Adjust the granularity of the channel estimation according to the delay spread, and obtain the adjusted channel estimation granularity.

In this step, the granularity of the channel estimation is adjusted according to the delay spread obtained in the previous step.

In the adjusted channel estimation granularity, the number of carriers corresponding to the single channel estimation is different from the number of carriers corresponding to the granularity adjustment, and the number of carriers corresponding to the channel response obtained by the single channel estimation is adjusted. The number of carriers corresponding to the whole is different, and the specific expression is that in the channel response obtained by channel estimation, the range value of the carrier index corresponding to the same channel response parameter quantity is smaller.

Step 104: Perform delay compensation on the channel response according to the adjusted channel estimation granularity according to the channel delay, and obtain a channel response after delay compensation.

The transmission channels that can be determined by different carriers and antennas are different from each other. Here, delay compensation is performed for corresponding channel responses on each channel. Using the channel delay obtained in the previous step, the channel response is time-delayed in units of channel estimation granularity. After the granularity of the channel estimation is adjusted, the number of carriers corresponding to the unit granularity and the granularity are changed before the granularity adjustment. Different carriers are marked by the carrier index, and different carrier indexes of the same granularity share the same channel response matrix for delay compensation calculation of the channel response.

Wherein, each channel estimation is in units of granularity, and the channel response corresponding to each channel estimation is different, and the channel responses corresponding to all carriers in each granularity are the same; specifically, after granularity adjustment, each granularity The channel response corresponding to a group of carriers is expressed by the channel response corresponding to the carrier with the smallest index number before the granularity adjustment, or by the mean or median of the channel responses before the granularity adjustment corresponding to each carrier.

For example, the channel estimation is 10 carriers before the granularity adjustment, and the carriers with the carrier index of 0-9, 10-19, ..., n-n+9 form different groups, respectively corresponding to a fixed channel response; The estimated granularity is adjusted to 5 carriers, and carriers with carrier indices of 0-4, 5-9, ..., n-n+4 constitute different groups, respectively corresponding to a fixed channel response; wherein, channel estimation After the granularity adjustment, the channel response corresponding to the carrier with the carrier index of 0-4 is represented by the corresponding channel response before the granularity adjustment of the carrier with the carrier index of 0, and the other groups are treated similarly.

Step 105: Compensate the received antenna data according to the channel response after the delay compensation, and combine the compensated antenna data.

The received antenna data is data received by each antenna after a plurality of fading independent signals arrive at the base station antenna. Since the base station has many antennas, there are many carriers on each antenna, so it is necessary to compensate the data on each carrier of each antenna by the delay compensated channel response.

The merging of the compensated antenna data is specifically performed by performing cumulative combining or weighted accumulation combining on the compensated antenna data.

By adopting the method of combining antenna data under the delay channel provided by the present invention, the calculation amount of the data merging process can be changed, the calculation process is more easily realized, and the performance of the communication system can be largely guaranteed.

Further, the specific calculation process and calculation method involved in each step described above will be separately described herein.

Specifically, it corresponds to step 103. The process of adjusting the granularity of the channel estimation according to the delay extension and obtaining the adjusted channel estimation granularity includes:

l=f(TA2)

In the above calculation process, the delay spread and the channel estimation granularity are inversely proportional. The larger the delay spread, the smaller the granularity of the channel estimation; the smaller the delay spread, the larger the granularity of the channel estimation. The product of the delay spread and the granularity of the channel estimate is an empirical value, depending on the overall performance of the system during signal transmission.

Specifically, it corresponds to step 104. The process of delaying the channel response according to the adjusted channel estimation granularity according to the channel delay, and obtaining the channel response after the delay compensation, specifically includes:

First, determining, according to the adjusted channel estimation granularity, a carrier index k corresponding to the channel response under each of the adjusted channel estimation granularities.

The same channel response corresponds to a set of carrier index values corresponding to the adjusted channel estimation granularity. In this process, the channel response corresponding to all carriers in each granularity is the same. As the channel estimation granularity changes, the number of carriers and the carrier index value change at each granularity, and the channel estimation granularity needs to be determined according to the adjusted channel. Determining a correspondence between a value of a carrier index k corresponding to the adjusted channel estimation granularity and a value of the channel response H(k, ka _Rx ), by determining a granularity of channel estimation at each of the adjusted channels Next, the correspondence between the channel response H(k, ka _Rx ) and the carrier index k, and further determining a set of carrier index k values corresponding to a channel response H(k, ka _Rx ) parameter quantity, so as to achieve Channel estimation granularity, based on channel delay, delay compensation for channel response.

Secondly, delay compensation is performed on the channel response according to the following formula, and the channel response after delay compensation is obtained:

Wherein, TA1 represents a channel delay, ka _Rx represents an antenna index, H(k, ka _Rx ) represents a channel response corresponding to the kth _Rx antenna on the kth carrier, and j represents an imaginary unit, H'(k, ka _Rx ) Indicates the channel response after the delay compensation, and k represents the carrier index.

Specifically, it corresponds to step 105. The process of compensating the received antenna data according to the channel response after the delay compensation includes:

Y'(k,ka _Rx )=H' ^* (k,ka _Rx )*Y(k,ka _Rx )

In this step, the received antenna data is mainly compensated by using the conjugate of the channel response after the delay compensation obtained in the previous step. Where H' ^* (k, ka _Rx ) represents the conjugate of the channel response after the delay compensation, and Y(k, ka _Rx ) represents the antenna data received by the ka _rx antennas corresponding to the kth carrier. Y'(k, ka _Rx ) represents the compensated antenna data.

Specifically, the implementation process of the foregoing method is described in conjunction with the specifically obtained channel response and the channel delay corresponding to the channel response and the time delay extension parameter value.

Assume that the delay of the system is 32Ts and the delay is extended to 3Ts. The specific implementation is as follows:

Step 1. Obtain channel response and delay through SRS. Using the received SRS signal, the channel response H is obtained using the MMSE channel estimation, and the obtained channel response H can be used to estimate the delay of 32 Ts and the delay spread of 3 Ts.

In step 2, the granularity of the channel estimation is adjusted according to the delay spread. The granularity l of the channel estimation is adjusted according to the delay extended by 3Ts obtained in the previous step. The product of the delay spread and the granularity of the channel estimate is chosen to be 36, and the granularity l of the channel estimate is 12 carriers.

36=l×TA2

In step 3, delay compensation is performed on the channel response. The delay of the channel response is compensated by using the delay of 32Ts obtained in the previous step. The calculation expression is as follows, where k is the carrier index and ka _Rx is the antenna index.

Step 4: Compensate the antenna data by the conjugate of the channel response after the delay compensation. The calculation expression is as follows, where k is the carrier index, ka _Rx is the antenna index, Y is the received antenna data, and superscript * indicates the conjugate. Then all the antenna data after the compensation is accumulated.

Y'(k,ka _Rx )=H' ^* (k,ka _Rx )*Y(k,ka _Rx )

Assume that the delay of the system is 8Ts and the delay is extended to 12Ts. The specific implementation is as follows:

Step 1. Obtain channel response and delay through SRS. The channel response H is obtained using the received SRS signal using the MMSE channel estimate, and the obtained channel response H can be used to estimate the delay of 8 Ts and the delay spread of 12 Ts.

In step 2, the granularity of the channel estimation is adjusted according to the delay spread. The granularity l of the channel estimation is adjusted according to the delay spread 12Ts obtained in the previous step. The product of the delay spread and the granularity of the channel estimate is chosen to be 36, and the granularity l of the channel estimate is 3 carriers.

36=l×TA2

In step 3, delay compensation is performed on the channel response. The delay of the channel response is compensated by using the delay of 8Ts obtained in the previous step. The calculation expression is as follows, where k is the carrier index and ka _Rx is the antenna index.

Step 4: Compensate the antenna data by the conjugate of the channel estimate. The calculation expression is as follows, where k is the carrier index, ka _Rx is the antenna index, Y is the received antenna data, and superscript * indicates the conjugate. Then all the antenna data after the compensation is accumulated.

Y'(k,ka _Rx )=H' ^* (k,ka _Rx )*Y(k,ka _Rx )

According to the method for combining antenna data in a delay channel according to the present invention, the method first obtains channel response, channel delay and delay spread by SRS, and then adjusts the granularity of channel estimation according to delay spread, and then adjusts the granularity. Delay compensation of the channel response, and finally compensate the antenna data by the conjugate of the channel response after the delay compensation, and finally realize the merging of the compensated antenna data, which can change the calculation amount of the data merging process, so that the calculation process It is easier to implement, which in turn improves the overall performance of the communication system.

Second embodiment

This embodiment discloses an apparatus for combining antenna data under a delay channel. The apparatus includes: a signal acquisition module 201, a parameter acquisition module 202, a granularity adjustment module 203, a delay compensation module 204, and an antenna data processing module 205.

The signal acquisition module 201 is configured to acquire the sounding reference signal SRS sent by the user equipment UE.

The parameter obtaining module 202 is configured to obtain, according to the SRS, a channel response, a channel delay corresponding to the channel response, and a delay extension.

The granule adjustment module 203 is configured to adjust the granularity of the channel estimation according to the delay spread, and obtain the adjusted channel estimation granularity.

The delay compensation module 204 is configured to perform delay compensation on the channel response according to the adjusted channel estimation granularity according to the channel delay, and obtain a channel response after delay compensation.

The antenna data processing module 205 is configured to compensate the received antenna data according to the channel response after the delay compensation, and combine the compensated antenna data.

Specifically, the granularity adjustment module 203 is specifically configured to:

l=f(TA2)

Specifically, the delay compensation module 204 is specifically configured to:

Specifically, the antenna data processing module 205 is specifically configured to:

Y'(k,ka _Rx )=H' ^* (k,ka _Rx )*Y(k,ka _Rx )

The apparatus in the above preferred embodiment includes: a signal acquisition module, a parameter acquisition module, a granularity adjustment module, a delay compensation module, and an antenna data processing module. The cooperation between the modules enables the channel response, channel delay and delay spread to be obtained through SRS, and then adjusts the granularity of the channel estimation according to the delay spread, and then delays the channel response under the adjusted granularity, and finally passes the time delay. The conjugate of the compensated channel response compensates the antenna data, and finally combines the compensated antenna data to realize the calculation of changing the data merging process, making the calculation process easier to implement, thereby improving the overall performance of the communication system. .

The modules or units in the apparatus provided by the embodiments of the present application may pass through one or more digital signal processors (DSPs), application specific integrated circuits (ASICs), processors, microprocessors, controllers, microcontrollers, and on-site Implemented by a programming array (FPGA), programmable logic device, or other electronic unit, or any combination thereof. Some of the functions or processes described in this application embodiment may also be implemented by software executing on a processor.

For example, the embodiment of the present invention further provides an apparatus for combining antenna data under a delay channel, for example, the apparatus may be applied to a communication device, including:

processor;

a memory for storing processor executable instructions;

Wherein the processor is configured to:

Obtaining a sounding reference signal SRS sent by the user equipment UE;

Industrial applicability

The present application can be applied to the field of communications, and in particular, can be applied to solve the problem of increased system computation and complexity in the case of channel delay or delay expansion. Obtain channel response, channel delay and delay spread through SRS, then adjust the granularity of channel estimation according to delay spread, and then delay the channel response under the adjusted granularity, and finally pass the channel response after delay compensation. The conjugate conjugates the antenna data, and finally combines the compensated antenna data, which can change the calculation amount of the data merging process, making the calculation process easier to implement, and improving the overall performance of the communication system.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. Within the scope of protection of the invention.

Claims

A method for merging antenna data under a time delay channel, comprising:

Obtaining a sounding reference signal SRS sent by the user equipment UE;

Obtaining, according to the SRS, a channel response, a channel delay corresponding to the channel response, and a delay extension;

Adjusting a granularity of the channel estimation according to the delay extension, and obtaining an adjusted channel estimation granularity;

And performing delay compensation on the channel response according to the adjusted channel estimation granularity, and obtaining a channel response after delay compensation according to the channel delay;

And receiving the compensated antenna data according to the channel response after the delay compensation, and combining the compensated antenna data.
The method of claim 1 wherein

And adjusting the granularity of the channel estimation according to the delay extension, and obtaining the adjusted channel estimation granularity, including:

Adjust the granularity of the channel estimation according to the following formula to obtain the adjusted channel estimation granularity:

l=f(TA2)

Where TA2 represents delay spread, f is an inverse proportional function, and l is the adjusted channel estimation granularity.
The method of claim 1 wherein

And performing the delay compensation on the channel response according to the adjusted channel estimation granularity according to the channel delay, and obtaining the channel response after the delay compensation, including:

Determining, according to the adjusted channel estimation granularity, a carrier index k corresponding to the channel response under each of the adjusted channel estimation granularities;

The channel response is subjected to delay compensation according to the following formula, and the channel response after delay compensation is obtained:

Wherein, TA1 represents a channel delay, ka Rx represents an antenna index, H(k, ka Rx ) represents a channel response corresponding to the kth Rx antenna on the kth carrier, and j represents an imaginary unit, H'(k, ka Rx ) Indicates the channel response after delay compensation.
The method of claim 1 wherein

Performing compensation on the received antenna data according to the channel response after the delay compensation, including:

The received antenna data is compensated according to the following formula to obtain compensated antenna data:

Y'(k,ka Rx )=H' * (k,ka Rx )*Y(k,ka Rx )

Where H' * (k, ka Rx ) represents the conjugate of the channel response after the delay compensation, and Y(k, ka Rx ) represents the antenna data received by the ka rx antennas corresponding to the kth carrier. Y'(k, ka Rx ) represents the compensated antenna data.
A device for combining antenna data under a delay channel, comprising:

a signal acquisition module, configured to acquire a sounding reference signal SRS sent by the user equipment UE;

a parameter obtaining module, configured to acquire, according to the SRS, a channel response, a channel delay corresponding to the channel response, and a delay extension;

a granularity adjustment module, configured to adjust a granularity of the channel estimation according to the delay extension, and obtain an adjusted channel estimation granularity;

The delay compensation module is configured to perform delay compensation on the channel response according to the adjusted channel estimation granularity according to the channel delay, and obtain a channel response after delay compensation;

The antenna data processing module is configured to compensate the received antenna data according to the channel response after the delay compensation, and combine the compensated antenna data.
The apparatus according to claim 5, wherein the granularity adjustment module is configured to:

Adjust the granularity of the channel estimation according to the following formula to obtain the adjusted channel estimation granularity:

l=f(TA2)

Where TA2 represents delay spread, f is an inverse proportional function, and l is the adjusted channel estimation granularity.
The apparatus according to claim 5, wherein the delay compensation module is configured to:

Determining, according to the adjusted channel estimation granularity, a carrier index k corresponding to the channel response under each of the adjusted channel estimation granularities;

The channel response is subjected to delay compensation according to the following formula, and the channel response after delay compensation is obtained:

Wherein, TA1 represents a channel delay, ka Rx represents an antenna index, H(k, ka Rx ) represents a channel response corresponding to the kth Rx antenna on the kth carrier, and j represents an imaginary unit, H'(k, ka Rx ) Indicates the channel response after delay compensation.
The apparatus according to claim 5, wherein said antenna data processing module is configured to:

The received antenna data is compensated according to the following formula to obtain compensated antenna data:

Y'(k,ka Rx )=H' * (k,ka Rx )*Y(k,ka Rx )

Where H' * (k, ka Rx ) represents the conjugate of the channel response after the delay compensation, and Y(k, ka Rx ) represents the antenna data received by the ka rx antennas corresponding to the kth carrier. Y'(k, ka Rx ) represents the compensated antenna data.