CN103095612A - Method and equipment of confirming signal to noise ratio - Google Patents

Abstract

The invention relates to the technical field of digital communications, in particular to a method and equipment of confirming a signal to noise ratio. The method and the noise are used for solving the problem that in the prior art, power is leaked. The method of confirming the signal to noise ratio comprises conducting zero adding prolongation according to a confirmed a frequency domain channel response sequence of a channel detection reference signal SRS corresponding to all user equipment, confirming a time domain channel response sequence corresponding to the frequency domain channel response sequence after the zero adding prolongation, aimed at each user equipment, confirming main diameter value of the time domain channel response sequence in a corresponding time window of the user equipment, shifting the main diameter value to a responsive starting point of a time domain channel, conducting downsampling for the time domain channel response sequence after shifting to obtain a time domain downsampling channel response sequence, and confirming the signal to noise ratio of the user equipment according to the time domain downsampling channel response sequence. The method and the equipment of confirming the signal to noise ratio reduce leaking of the power.

Description

Method and equipment for determining signal-to-noise ratio

Technical Field

The present invention relates to the field of digital communication technologies, and in particular, to a method and an apparatus for determining a signal-to-noise ratio.

Background

The LTE (long term evolution) system specifies the transmission time and frequency domain position of SRS (Sounding Reference Signal). As shown in fig. 1, in time, SRS is transmitted on the last symbol (channel sounding reference symbol) of the uplink subframe; in the frequency domain, the SRS is placed at intervals of one subcarrier to form a "comb" frequency domain structure. In an LTE system, the SRS serves to provide a channel quality reference for uplink frequency selective scheduling of a base station, that is, a user equipment scheduled by the base station transmits the SRS to the base station through an uplink subframe configured by the base station, the base station determines the channel quality of an uplink according to the received SRS from the user equipment, and performs uplink frequency selective scheduling according to the determined channel quality, wherein all user equipments in a cell corresponding to the base station reserve positions for the SRS.

Since only the ue scheduled by the base station performs SRS transmission through the uplink subframe configured by the base station, in order to support more ues to transmit SRS and participate in uplink frequency selective scheduling, in the prior art, the SRS is generally multiplexed in a code division manner, that is, SRS corresponding to multiple ues are transmitted on the same time-frequency resource through cyclic shifts with different base sequences. The expression of the channel sounding reference signal sequence is as follows:

$r_{u,v}^{\left(\mathrm{\α}\right)}\left(n\right)=e^{\mathrm{j\αn}}{r}_{u,v}\left(n\right)$

wherein r is_u,v(n) is a base sequence,

in order to perform the cyclic displacement, the displacement is determined,

configured by a higher layer. As shown in fig. 2, the SRS corresponding to multiple user equipments is transmitted in a code division multiplexing manner, and is reflected in a time domain, where a transmission time is divided into multiple time windows, and different user equipments are based onThe different values, the corresponding SRS is transmitted within the respective time window. Wherein r is_u,vThe length of (n) is determined by the number of RBs (resource blocks) allocated to the SRS signal, and the minimum number of RBs supported by the current LTE system is 4, and the maximum number of RBs is 94.

Since the SRS is distributed in a comb shape in the frequency domain, if 15KHz is used as the subcarrier bandwidth, and when the number of RBs is equal to 4, the length of the SRS base sequence is 24 points, at this time, the time domain interval between each two points of the SRS signal is about 1.39 microseconds, and the time error of the arrival of the uplink subframe corresponding to the user equipment is not necessarily a multiple of this interval, which may cause inaccurate measured time domain channel response of the user equipment and generate interference, i.e., power leakage, on the measurement of the time domain channel response of other user equipment. Accordingly, the same problem occurs when the number of RBs is equal to 94.

In summary, at present, when SRS corresponding to multiple user equipments are transmitted in a code division multiplexing manner, there is a problem of power leakage, which results in inaccurate signal-to-noise ratios of the multiple user equipments determined by the base station, and accordingly, inaccurate channel quality determined by the base station, thereby negatively affecting uplink frequency selective scheduling performed by the base station, and further reducing overall performance of the system.

Disclosure of Invention

The method and the device for determining the signal-to-noise ratio are used for solving the problem that power leakage exists when SRS corresponding to a plurality of user devices are transmitted in a code division multiplexing mode in the prior art.

The method for determining the signal-to-noise ratio provided by the embodiment of the invention comprises the following steps:

carrying out zero padding continuation on frequency domain channel response sequences determined according to channel Sounding Reference Signals (SRS) corresponding to all user equipment, and determining time domain channel response sequences corresponding to the frequency domain channel response sequences subjected to zero padding;

for each user equipment, determining a main path value of a time domain channel response sequence in a time window corresponding to the user equipment, shifting the main path value to a starting point of the time domain channel response, and performing down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampling channel response sequence; determining the signal-to-noise ratio of the user equipment according to the time domain down-sampling channel response sequence;

the user equipment transmits the SRS corresponding to the user equipment on the same uplink subframe by adopting a code division multiplexing mode.

The invention provides a device for determining signal-to-noise ratio, which comprises:

the processing module is used for carrying out zero padding continuation on the frequency domain channel response sequences determined according to the channel Sounding Reference Signals (SRS) corresponding to all the user equipment and determining time domain channel response sequences corresponding to the frequency domain channel response sequences after the zero padding continuation;

a determining module, configured to determine, for each ue, a major diameter value of the time domain channel response sequence in a time window corresponding to the ue, shift the major diameter value to a starting point of the time domain channel response, and perform down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampled channel response sequence; determining the signal-to-noise ratio of the user equipment according to the time domain down-sampling channel response sequence;

the user equipment transmits the SRS corresponding to the user equipment on the same uplink subframe by adopting a code division multiplexing mode.

In the embodiment of the invention, zero padding continuation is carried out on frequency domain channel response sequences determined according to SRS (sounding reference signals) corresponding to all user equipment, and time domain channel response sequences corresponding to the frequency domain channel response sequences after the zero padding continuation are determined; for each user equipment, determining a main path value of a time domain channel response sequence in a time window corresponding to the user equipment, shifting the main path value to a starting point of the time domain channel response, and performing down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampling channel response sequence; determining the signal-to-noise ratio of the user equipment according to the time domain down-sampling channel response sequence; the user equipment transmits the SRS corresponding to the user equipment on the same uplink subframe in a code division multiplexing mode, and the frequency domain channel response sequence after zero padding is converted into the corresponding time domain channel response sequence, the main path position of the time domain channel response sequence is determined, and the down-sampling processing is carried out, so that the time error of the arrival of the uplink subframe corresponding to the user equipment is partially compensated, the power leakage is reduced, the accuracy of the signal-to-noise ratio of the determined user equipment and the accuracy of the determined channel quality are improved, the efficiency of uplink frequency selective scheduling is improved, and the overall performance of a system is improved.

Drawings

Fig. 1 is a schematic diagram of the transmission time and frequency domain position of an SRS signal in the prior art;

fig. 2 is a diagram illustrating SRS signals transmitted by ue in respective time windows according to the prior art;

FIG. 3 is a flowchart illustrating a method for determining a signal-to-noise ratio according to an embodiment of the present invention;

FIG. 4 is a flowchart illustrating a detailed method for determining SNR according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an apparatus for determining a signal-to-noise ratio according to an embodiment of the present invention.

Detailed Description

According to the embodiment of the invention, zero padding continuation is carried out on frequency domain channel response sequences determined according to channel Sounding Reference Signals (SRS) corresponding to all user equipment, and time domain channel response sequences corresponding to the frequency domain channel response sequences after the zero padding continuation are determined; for each user equipment, determining a main path value of a time domain channel response sequence in a time window corresponding to the user equipment, shifting the main path value to a starting point of the time domain channel response, and performing down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampling channel response sequence; determining the signal-to-noise ratio of the user equipment according to the time domain down-sampling channel response sequence; the user equipment transmits the SRS corresponding to the user equipment on the same uplink subframe in a code division multiplexing mode, and the frequency domain channel response sequence after zero padding is converted into the corresponding time domain channel response sequence, the main path position of the time domain channel response sequence is determined, and the down-sampling processing is carried out, so that the time error of the arrival of the uplink subframe corresponding to the user equipment is partially compensated, the power leakage is reduced, the accuracy of the signal-to-noise ratio of the determined user equipment and the accuracy of the determined channel quality are improved, the efficiency of uplink frequency selective scheduling is improved, and the overall performance of a system is improved.

The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.

As shown in fig. 3, the method for determining the signal-to-noise ratio according to the embodiment of the present invention includes the following steps:

step 301, performing zero padding extension on a frequency domain channel response sequence determined according to channel Sounding Reference Signals (SRS) corresponding to all user equipment, and determining a time domain channel response sequence corresponding to the frequency domain channel response sequence after the zero padding extension;

step 302, for each user equipment, determining a main path value of a time domain channel response sequence in a time window corresponding to the user equipment, shifting the main path value to a starting point of the time domain channel response, and performing down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampling channel response sequence; determining the signal-to-noise ratio of the user equipment according to the time domain down-sampling channel response sequence;

the user equipment transmits the SRS corresponding to the user equipment on the same uplink subframe by adopting a code division multiplexing mode.

The time domain channel response sequence is composed of an index number and a time domain channel response corresponding to the index number, and one index number and the time domain channel response corresponding to the index number form one point of the time domain channel response sequence. The frequency domain channel response sequence and the time domain down-sampled channel response sequence are similar in construction to the time domain channel response sequence.

Preferably, in step 301, frequency domain channel estimation is performed on SRSs corresponding to all user equipments, and there are various methods for determining a frequency domain channel response sequence, for example, an LS algorithm, a timing estimation method, and the like.

Preferably, in step 301, there are various ways to perform zero padding extension on the frequency domain channel response sequence, for example, zero padding extension may be performed at the head end of the frequency domain channel response sequence, zero padding extension may be performed at the tail end of the frequency domain channel response sequence, or zero padding extension may be performed at both ends of the frequency domain channel response sequence, respectively.

In the following, zero padding extension is performed at the end of the frequency domain channel response sequence, and the implementation manner of other cases is similar to the implementation manner of zero padding extension performed at the end of the frequency domain channel response sequence in the embodiment of the present invention, and is not described herein again.

Assuming that the number of points of the frequency domain channel response sequence is k, the frequency domain channel response corresponding to the frequency domain channel response sequence after the end of the frequency domain channel response sequence is subjected to the n-times zero padding prolongation is as follows:

${\tilde{H}}_{\mathrm{SRS}}=[{\mathrm{<figure-callout\; id="1"\; label="H"\; filenames="HDA00002746832500012.png,HDA00002746832500031.png"\; state="\{\{state\}\}">H</figure-callout>}}_1,H_2,......,H_k,\mathrm{0,0},......,0,......,\mathrm{0,0},......,0]$ … … formula one;

wherein,

frequency domain channel response, H, corresponding to the frequency domain channel response sequence with n times zero padding extension for the end₁~H_kThe number of 0 is (n-1) k, which is the frequency domain channel response corresponding to k points of the frequency domain channel response sequence.

In specific implementation, the value of n can be set according to requirements, and preferably, n is equal to [2,8 ].

Preferably, in step 301, the frequency domain channel response sequence after zero padding may be subjected to fourier transform to obtain a corresponding time domain channel response sequence.

Preferably, in step 302, there are various methods for determining the major path value of the time domain channel response sequence in the time window corresponding to the ue, for example, according to the existing mathematical methods, preferably, the index number of the major path of the time domain channel response sequence in the time window corresponding to the ue is determined; and determining a main path value of the time domain channel response sequence in a time window corresponding to the user equipment according to the index number.

The main path of the time domain channel response sequence in the time window corresponding to the user equipment refers to a point where a maximum value of the time domain channel response sequence in the time window corresponding to the user equipment is located, and the time domain channel response corresponding to the index number of the main path of the time domain channel response sequence in the time window corresponding to the user equipment is the maximum value (main path value) of the time domain channel response sequence in the time window corresponding to the user equipment.

Preferably, the index number of the main path of the time domain channel response sequence in the time window corresponding to the ue is determined according to the following formula:

$L_i=\underset{j}{\arg }\max \left|h_j\right|$ … … formula two;

wherein, $j\&Element;\left\{\begin{array}{c}[D_i,D_i+\frac{\mathrm{nk}}{Q}],D_i\&GreaterEqual;0\\ [\mathrm{nk}+D_i,\mathrm{nk}]\&cup;[1,D_i+\frac{\mathrm{nk}}{Q}],D_i<0\end{array}\right.,$ L_iindex number of main path in time window corresponding to user equipment representing time domain channel response sequence, j represents index number of time domain channel response sequence, h_jFor time domain channel response with index j, D_iAnd the index number of the initial position of the time window corresponding to the ith user equipment is represented, Q represents the number of the time window, n is the multiple of zero padding extension of the frequency domain channel response sequence, and k is the point number of the frequency domain channel response sequence.

Preferably, D is determined according to the following formula_i：

$D_i=\frac{n_{\mathrm{SRS}}^{\mathrm{cs}}\mathrm{nk}}{Q}-\mathrm{n\&Delta;}$ .... formula three;

wherein, Δ is an index advance used for measuring the advance of SRS corresponding to the user equipment transmitting itself, and the magnitude of Δ may be determined according to the actual situation.

As shown in fig. 2, there are 8 time windows corresponding to the ue; assuming that 20 time domain channel response sequences corresponding to the frequency domain channel response sequences determined according to the channel sounding reference signals SRS of all user equipment are total, the number of points of the time domain channel response sequences in a window 1 corresponding to the user equipment 1 is 4, and when the index number is 0, the time domain channel response is A; when the index number is 1, the time domain channel response is B; when the index number is 2, the time domain channel response is C; when the index number is 3, the time domain channel response is D;

if the index number of the main path of the time domain channel response sequence in the window 1 corresponding to the user equipment 1 is determined to be 2 according to the formula two and the formula three, the time domain channel response corresponding to the index number 2 is the maximum value (main path value) of the time domain channel response sequence in the time window 1 corresponding to the user equipment 1.

Preferably, in step 302, shifting the main path value corresponding to the index number to the starting point of the time domain channel response includes:

the index number of the time domain channel response sequence is not shifted, and the time domain channel response of the time domain channel response sequence is shifted, so that the main path value is shifted to the starting point of the time domain channel response.

In implementation, the main path value may be shifted to the starting point of the time domain channel response by a left shift, the main path value may be shifted to the starting point of the time domain channel response by a right shift, or the main path value may be shifted to the starting point of the time domain channel response by a combination of the left shift and the right shift, which may be determined specifically according to needs.

As shown in fig. 2, it is assumed that the time domain channel response sequence has 20 points, the number of points of the time domain channel response sequence in the window 1 corresponding to the user equipment 1 is 4, and when the index number is 0, the time domain channel response is a; when the index number is 1, the time domain channel response is B; when the index number is 2, the time domain channel response is C; when the index number is 3, the time domain channel response is D; when the index number is 19, the time domain channel response is G;

if C is the maximum value in A, B, C, D, and the index number of the main path of the time domain channel response sequence in the window 1 corresponding to the user equipment 1 is 2, then shift operation is not performed on the index number of the time domain channel response sequence, but shift operation is performed on the time domain channel response of the time domain channel response sequence, C is shifted to the starting point of the time domain channel response by left shift and/or right shift, and the left shift is taken as an example for introduction below;

before the time domain channel response sequence is not shifted, the time domain channel response of the time domain channel response sequence is as follows: ABCD … … G;

after shifting left by one bit, the time domain channel response of the time domain channel response sequence is: BCD … … GA;

after shifting the main path value to the starting point of the time domain channel response, the time domain channel response of the time domain channel response sequence is: CD … … GAB.

The embodiment of determining the shifted time domain channel response sequence corresponding to the user equipment 2 is similar to the embodiment of determining the shifted time domain channel response sequence corresponding to the user equipment 1.

Preferably, in step 302, the time-domain down-sampled channel response sequence can be obtained by down-sampling the shifted time-domain channel response sequence by n times (where the multiple of the zero padding extension is the same as the multiple of the down-sampling).

Preferably, in step 302, determining the signal-to-noise ratio of the ue according to the time-domain down-sampled channel response sequence includes:

step S1, determining a noise power value corresponding to each user equipment according to the time domain down-sampling channel response sequence;

step S2, determining the minimum noise power value in the noise power values corresponding to the determined user equipments;

step S3, determining the signal total power value of the user equipment according to the time domain down-sampling channel response sequence;

step S4, determining the signal power value of the user equipment according to the signal total power value of the user equipment and the determined minimum noise power value; and determining the signal-to-noise ratio of the user equipment according to the signal power value of the user equipment and the determined minimum noise power value.

Preferably, in step S1, the noise power value in the time window without user equipment corresponding to the user equipment is determined according to the following formula:

$P_{\mathrm{noise}}^{i,m}=\left\{\begin{array}{cc}\underset{j={\tilde{D}}_m^i}{\overset{{\tilde{D}}_m^i+\frac{k}{Q}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2,{\tilde{D}}_m^i+\frac{k}{Q}\&GreaterEqual;0& \\ \underset{j={\tilde{D}}_m^i+k}{\overset{{\tilde{D}}_m^i+\frac{(Q+1)k}{Q}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2,{\tilde{D}}_m^i+\frac{k}{Q}<0& \end{array}\right.$ … … formula four;

wherein,

representing the noise power value in the mth time window without user equipment corresponding to the ith user equipment, wherein M is more than or equal to 1 and less than or equal to M, M is the number of the time windows without user equipment,indicating the index number where the start position of the mth time window without the user equipment is located.

Preferably, the determination is made according to the following formula

… … formula five;

wherein,

for mth time window without user equipment

Here, the time window without the user equipment refers to a time window in which no user equipment performs SRS transmission within the time window.

Preferably, before step S2, the method further includes:

determining (Q-M) M noise power values within M time windows of no user equipment.

Preferably, in step S2, the minimum noise power value is determined according to the following formula:

i∈[1,Q-M],m∈[1,M].... formula six;

wherein, P_{min_noise}Is the minimum noise power value.

Preferably, in step S3, the total signal power value of the ue is determined according to the following formula:

$P_{\mathrm{total}}^i=\underset{j=1}{\overset{\frac{k}{Q}-\mathrm{\&Delta;}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2+\underset{j=k-\mathrm{\&Delta;}}{\overset{k}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2$ … … formula seven;

wherein,indicates the signal total power value of the ith user equipment,

and representing the time domain down-sampling channel response sequence corresponding to the ith user equipment.

For example, taking fig. 2 as an example, in fig. 2, there are 8 time windows corresponding to the ues in total, and windows 2 to 4 and windows 6 to 8 are time windows without ues.

For the user equipment 1, after determining a time domain down-sampling channel response sequence corresponding to the user equipment 1, determining a signal total power value of the user equipment 1 according to a formula seven; according to the formula four and the formula five, noise power values in the windows 2-4 and the windows 6-8 are respectively determined;

for the user equipment 2, after determining a time domain down-sampling channel response sequence corresponding to the user equipment 2, determining a signal total power value of the user equipment 2 according to a formula seven; according to the formula four and the formula five, noise power values in the windows 2-4 and the windows 6-8 are respectively determined;

and determining the minimum noise power value in the noise power values according to the formula six.

Preferably, the steps S1 and S3 are performed simultaneously, and the step S1 may be performed first, or the step S3 may be performed first, as required.

Preferably, in step S4, the signal power value of the ue is determined according to the following formula:

$P_{\mathrm{signal}}^i=P_{\mathrm{total}}^i-P_{\min \_\mathrm{noise}}$ … … equation eight;

wherein,

for the signal power value of the user equipment, i belongs to [1, Q-M ∈ [ ]]。

Preferably, in step S4, the snr of the ue is determined according to the following formula:

${\mathrm{SNR}}_i=\frac{P_{\mathrm{signal}}^i}{P_{\min \_\mathrm{noise}}}$ … … formula nine

Wherein the SNR_iFor the signal-to-noise ratio of the user equipment, i ∈ [1, Q-M ∈ [ ]]。

Preferably, the frequency domain channel response sequence after the zero padding extension is transformed into a corresponding time domain channel response sequence, and the main path position of the time domain channel response sequence is determined and down-sampled, so that the time error of the arrival of the uplink subframe corresponding to the user equipment is partially compensated, the power leakage is reduced, and the accuracy of the determined signal-to-noise ratio of the user equipment is improved.

As shown in fig. 4, the detailed method for determining the signal-to-noise ratio according to the embodiment of the present invention includes the following steps:

step 401, performing frequency domain channel estimation on SRSs corresponding to all user equipments, and determining a frequency domain channel response sequence;

step 402, performing 8 times of zero adding continuation on the frequency domain channel response sequence;

step 403, performing fourier transform on the frequency domain channel response sequence after zero padding continuation to obtain a corresponding time domain channel response sequence;

step 404, determining an index number (i initial value is 1) of a main path of the time domain channel response sequence in a time window corresponding to the ith user equipment;

step 405, shifting the main path value corresponding to the index number to the starting point of the time domain channel response;

step 406, performing 8-time down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampling channel response sequence;

step 407, determining a total signal power value of the ith user equipment and determining a noise power value in a time window of each piece of non-user equipment according to the time domain down-sampling channel response sequence;

step 408, judging that i is less than Q-M, if so, making i equal to i +1, and executing step 404; otherwise, go to step 409;

step 409, determining a minimum noise power value according to the noise power value in the time window without the user equipment corresponding to each user equipment;

step 410, for a ue, determining a signal power value of the ue according to the total signal power value and the minimum noise power value of the ue, and determining a signal-to-noise ratio of the ue according to the signal power value and the minimum noise power value of the ue.

The execution main body of the embodiment of the present invention may be a network side device such as a base station.

Based on the same inventive concept, the embodiment of the present invention further provides a device for determining a signal-to-noise ratio, and since the principle of the device for solving the problem is similar to the method of the embodiment of the present invention, the implementation of the device may refer to the implementation of the method, and repeated details are not repeated.

Fig. 5 is a schematic structural diagram of an apparatus for determining a signal-to-noise ratio according to an embodiment of the present invention, where as shown in the figure, the apparatus for determining a signal-to-noise ratio according to an embodiment of the present invention includes:

a processing module 501, configured to perform zero padding extension on frequency domain channel response sequences determined according to SRS corresponding to all user equipments, and determine a time domain channel response sequence corresponding to the frequency domain channel response sequence after the zero padding extension;

a determining module 502, configured to determine, for each ue, a major diameter value of the time domain channel response sequence in a time window corresponding to the ue, shift the major diameter value to a starting point of the time domain channel response, and perform down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampled channel response sequence; determining the signal-to-noise ratio of the user equipment according to the time domain down-sampling channel response sequence;

the user equipment transmits the SRS corresponding to the user equipment on the same uplink subframe by adopting a code division multiplexing mode.

Preferably, the determining module 502 is specifically configured to determine the index number of the main path of the time domain channel response sequence in the time window corresponding to the ue; and determining a main diameter value according to the index number.

Preferably, the determining module 502 is specifically configured to determine the index number of the main path of the time domain channel response sequence in the time window corresponding to the ue according to a formula two and a formula three.

Preferably, the determining module 502 is specifically configured to determine a noise power value corresponding to each ue according to the time domain down-sampling channel response sequence; determining a minimum noise power value in the noise power values corresponding to the determined user equipment; determining the signal total power value of the user equipment according to the time domain down-sampling channel response sequence; determining the signal power value of the user equipment according to the total signal power value of the user equipment and the determined minimum noise power value; and determining the signal-to-noise ratio of the user equipment according to the signal power value of the user equipment and the determined minimum noise power value.

Preferably, the determining module 502 is specifically configured to determine the total signal power value of the ue according to formula seven.

Preferably, the determining module 502 is specifically configured to determine the noise power value corresponding to each ue according to formula four and formula five.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (16)

1. A method of determining a signal-to-noise ratio, the method comprising:

carrying out zero padding continuation on frequency domain channel response sequences determined according to channel Sounding Reference Signals (SRS) corresponding to all user equipment, and determining time domain channel response sequences corresponding to the frequency domain channel response sequences subjected to zero padding;

for each user equipment, determining a main path value of the time domain channel response sequence in a time window corresponding to the user equipment, shifting the main path value to a starting point of the time domain channel response, and performing down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampling channel response sequence; determining the signal-to-noise ratio of the user equipment according to the time domain down-sampling channel response sequence;

the user equipment transmits the SRS corresponding to the user equipment on the same uplink subframe by adopting a code division multiplexing mode.

2. The method of claim 1, wherein determining the major path value of the time domain channel response sequence in the time window corresponding to the ue comprises:

determining the index number of the main path of the time domain channel response sequence in a time window corresponding to the user equipment;

and determining the major diameter value according to the index number.

3. The method of claim 2, wherein the index number of the main path of the time domain channel response sequence in the time window corresponding to the ue is determined according to the following formula:

$L_i=\underset{j}{\arg }\max \left|h_j\right|$

wherein, $j\&Element;\left\{\begin{array}{c}[D_i,D_i+\frac{\mathrm{nk}}{Q}],D_i\&GreaterEqual;0\\ [\mathrm{nk}+D_i,\mathrm{nk}]\&cup;[1,D_i+\frac{\mathrm{nk}}{Q}],D_i<0\end{array}\right.,$ L_iindex number of main path in time window corresponding to user equipment representing time domain channel response sequence, j represents index number of time domain channel response sequence, h_jFor time domain channel response with index j, D_iAnd the index number of the initial position of the time window corresponding to the ith user equipment is represented, Q represents the number of the time window, n is the multiple of zero padding extension of the frequency domain channel response sequence, and k is the point number of the frequency domain channel response sequence.

4. The method of claim 3, wherein D is determined according to the following formula_i：

$D_i=\frac{n_{\mathrm{SRS}}^{\mathrm{cs}}\mathrm{nk}}{Q}-\mathrm{n\&Delta;}$

Wherein, Delta is the index advance.

5. The method of claim 1, wherein determining the signal-to-noise ratio of the user equipment based on the time-domain down-sampled channel response sequence comprises:

determining a noise power value corresponding to each user equipment according to the time domain down-sampling channel response sequence;

determining a minimum noise power value in the noise power values corresponding to the determined user equipment;

determining the signal total power value of the user equipment according to the time domain down-sampling channel response sequence;

determining the signal power value of the user equipment according to the total signal power value of the user equipment and the determined minimum noise power value; and determining the signal-to-noise ratio of the user equipment according to the signal power value of the user equipment and the determined minimum noise power value.

6. The method of claim 5 wherein the total signal power value for the UE is determined according to the following equation:

$P_{\mathrm{total}}^i=\underset{j=1}{\overset{\frac{k}{Q}-\mathrm{\&Delta;}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2+\underset{j=k-\mathrm{\&Delta;}}{\overset{k}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2$

wherein,

indicates the signal total power value of the ith user equipment,

and representing the time domain down-sampling channel response sequence corresponding to the ith user equipment.

7. The method of claim 5, wherein the noise power value for each UE is determined according to the following equation:

$P_{\mathrm{noise}}^{i,m}=\left\{\begin{array}{c}\underset{j={\tilde{D}}_m^i}{\overset{{\tilde{D}}_m^i+\frac{k}{Q}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2,{\tilde{D}}_m^i+\frac{k}{Q}\&GreaterEqual;0\\ \underset{j={\tilde{D}}_m^i+k}{\overset{{\tilde{D}}_m^i+\frac{(Q+1)k}{Q}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2,{\tilde{D}}_m^i+\frac{k}{Q}<0\end{array}\right.$

wherein,

representing the noise power value in the mth time window without user equipment corresponding to the ith user equipment, wherein M is more than or equal to 1 and less than or equal to M, M is the number of the time windows without user equipment,indicating the index number where the start position of the mth time window without the user equipment is located.

8. The method of claim 7, wherein the determination is made according to the following formula

Wherein,

for mth time window without user equipment

9. An apparatus for determining a signal-to-noise ratio, the apparatus comprising:

the processing module is used for carrying out zero padding continuation on the frequency domain channel response sequences determined according to the channel Sounding Reference Signals (SRS) corresponding to all the user equipment and determining time domain channel response sequences corresponding to the frequency domain channel response sequences after the zero padding continuation;

a determining module, configured to determine, for each ue, a major diameter value of the time domain channel response sequence in a time window corresponding to the ue, shift the major diameter value to a starting point of the time domain channel response, and perform down-sampling on the shifted time domain channel response sequence to obtain a time domain down-sampled channel response sequence; determining the signal-to-noise ratio of the user equipment according to the time domain down-sampling channel response sequence;

the user equipment transmits the SRS corresponding to the user equipment on the same uplink subframe by adopting a code division multiplexing mode.

10. The device according to claim 9, wherein the determining module is specifically configured to determine an index number of the main path of the time domain channel response sequence in a time window corresponding to the ue; and determining the major diameter value according to the index number.

11. The apparatus of claim 10, wherein the determining module is specifically configured to determine the index number of the main path of the time domain channel response sequence in the time window corresponding to the ue according to the following formula:

$L_i=\underset{j}{\arg }\max \left|h_j\right|$

wherein, $j\&Element;\left\{\begin{array}{c}[D_i,D_i+\frac{\mathrm{nk}}{Q}],D_i\&GreaterEqual;0\\ [\mathrm{nk}+D_i,\mathrm{nk}]\&cup;[1,D_i+\frac{\mathrm{nk}}{Q}],D_i<0\end{array}\right.,$ L_iindex number of main path in time window corresponding to user equipment representing time domain channel response sequence, j represents index number of time domain channel response sequence, h_jFor time domain channel response with index j, D_iAnd the index number of the initial position of the time window corresponding to the ith user equipment is represented, Q represents the number of the time window, n is the multiple of zero padding extension of the frequency domain channel response sequence, and k is the point number of the frequency domain channel response sequence.

12. The device according to claim 11, wherein the determination module is specifically configured to determine D according to the following formula_i：

$D_i=\frac{n_{\mathrm{SRS}}^{\mathrm{cs}}\mathrm{nk}}{Q}-\mathrm{n\&Delta;}$

Wherein, Delta is the index advance.

13. The device according to claim 9, wherein the determining module is specifically configured to determine a noise power value corresponding to each ue according to a time-domain down-sampled channel response sequence; determining a minimum noise power value in the noise power values corresponding to the determined user equipment; determining the signal total power value of the user equipment according to the time domain down-sampling channel response sequence; determining the signal power value of the user equipment according to the total signal power value of the user equipment and the determined minimum noise power value; and determining the signal-to-noise ratio of the user equipment according to the signal power value of the user equipment and the determined minimum noise power value.

14. The device according to claim 13, wherein the determining module is specifically configured to determine the total signal power value of the ue according to the following formula:

$P_{\mathrm{total}}^i=\underset{j=1}{\overset{\frac{k}{Q}-\mathrm{\&Delta;}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2+\underset{j=k-\mathrm{\&Delta;}}{\overset{k}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2$

wherein,indicates the signal total power value of the ith user equipment,and representing the time domain down-sampling channel response sequence corresponding to the ith user equipment.

15. The device according to claim 13, wherein the determining module is specifically configured to determine the noise power value corresponding to each ue according to the following formula:

$P_{\mathrm{noise}}^{i,m}=\left\{\begin{array}{c}\underset{j={\tilde{D}}_m^i}{\overset{{\tilde{D}}_m^i+\frac{k}{Q}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2,{\tilde{D}}_m^i+\frac{k}{Q}\&GreaterEqual;0\\ \underset{j={\tilde{D}}_m^i+k}{\overset{{\tilde{D}}_m^i+\frac{(Q+1)k}{Q}}{\mathrm{\&Sigma;}}}{\left|{\tilde{h}}_j^i\right|}^2,{\tilde{D}}_m^i+\frac{k}{Q}<0\end{array}\right.$

wherein,

representing the noise power value in the mth time window without user equipment corresponding to the ith user equipment, wherein M is more than or equal to 1 and less than or equal to M, M is the number of the time windows without user equipment,

indicating the index number where the start position of the mth time window without the user equipment is located.

16. The device according to claim 15, characterized in that said determination module is particularly adapted to determine according to the following formula

Wherein,for mth time window without user equipment

Images