WO2011035507A1

WO2011035507A1 - Measure method and apparatus for carrier-to-interference-and-noise ratio

Info

Publication number: WO2011035507A1
Application number: PCT/CN2009/075134
Authority: WO
Inventors: 苏小明; 姚春峰; 余秋星; 刘巧艳
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-09-24
Filing date: 2009-11-25
Publication date: 2011-03-31
Also published as: CN102035768A; CN102035768B

Abstract

A measure method and apparatus for carrier-to-interference-and-noise ratio are provided. The method can improve measure accuracy of the carrier-to-interference-and-noise ratio. The method includes following steps: receiving a reference signal; according to known sending sequence of every user, obtaining average power of sub-carrier signals of every user from the reference signal respectively; according to a total average power of the sub-carriers of a system and the average power of sub-carrier signals of every user, obtaining average power of the interference-and-noise on the sub-carriers; according to the average power of sub-carrier signals of every user and the average power of the interference-and-noise on the sub-carriers, obtaining carrier-to-interference-and-noise ratio of every user. The method can reduce the influence on signal power caused by frequency selectivity fading, channel time change or the signal power leaking brought by receiver time bias.

Description

Method and device for measuring carrier interference noise ratio

Technical field

The present invention relates to a wireless communication system, and in particular, to a CINR (Carrier to Interference and Noise Ratio) measurement method and apparatus.

Background technique

In wireless technology, multiple inputs and multiple outputs or MIM0 (Multi-Input Multiple-Out-put) limit the use of multiple antennas at the transmitter and receiver to improve communication performance.

For example, virtual MIMO is a communication technology that improves cell throughput in uplink radio access of a mobile communication system, wherein the virtual MIM0 allows stations to simultaneously transmit signals in the same frequency band and time even if the transmitter has a single antenna. Receive signals to multiple users or from multiple users. Increase the total throughput of individual senders by sharing resources between two or more senders or mobile devices. Generally, for uplink or transmission from a mobile device to a base station, a pair of users transmitting on the same resource may be formed to form the virtual MIM0 system, but more than two users may also be used to form this. Virtual MIM0 system.

In a MIM0 system such as a virtual MIM0 system, each subcarrier contains two parts of power, one is signal power and the other is interference noise power. The test flow of the carrier-to-interference and noise ratio is shown in Figure 1. It is the ratio of the signal power and the interference noise power on the subcarriers occupied by the desired users within a certain time range. It is an important parameter reflecting the channel quality and is the adaptive code rate. Required statistics for modulation, power control, etc.

The prior art related to the present invention provides a measurement algorithm for carrier-to-interference SNR in a virtual MIM0 system. The LTE PUSCH (Physical Uplink Share Channel) virtual MIM0 is used as an example. as follows:

Let the pilot signal received by the receiver be:

Y = Η ^{2 lu} X + H ₂ e ^{j 2ml lu} X + NI Equation ( 1 ) where H is the channel impulse response of the user, and is the cyclic offset of the user, ^ ₂ is the user 2 The channel impulse response is the cyclic offset of the user two; r is the mother code sequence of the pilot signal, and N/ represents the interference noise.

For the receiver; r is known, so the expression (1) can be transformed into

H = Hje ¹¹² + H ₂ e ^{j 2ml 112} + Νϊ ^ ( 2 ) NI' = NI IX , Since; Γ is a normalized signal, N/' has the same mean and variance as N7. In addition, ή = YIX , which represents the ratio of the received pilot signal to the pilot signal mother code sequence;

Transforming the point discrete Fourier transform (IDFT) into the time domain, by determining the interval in which the user's time domain signal is located, and then calculating the user's signal power in the interval to determine the user's two time domain signal. The interval is then calculated in this interval to calculate the user's two signal power. The interference noise power is calculated by subtracting the signal powers of the user one and the user two by the total power, thereby obtaining a carrier interference noise ratio.

However, in the case of multipath channels, the algorithm may overlap in the time domain, and the signals between users overlap in the time domain, which leads to inaccurate CINR measurement.

Summary of the invention

The technical problem to be solved by the present invention is to provide a measurement method and apparatus for carrier interference noise ratio, and to improve the measurement accuracy of the carrier interference noise ratio.

In order to solve the above technical problem, the present invention first provides a method for measuring a carrier-to-interference and noise ratio, which is applied to a wireless communication system, and the method includes:

Receiving a reference signal;

Obtaining average power of subcarrier signals of each user from the reference signals according to a known transmission sequence of each user;

Obtaining an average power of the interference noise on the subcarrier according to the total average power of the subcarriers of the system and the average power of the subcarrier signals of each user;

A carrier interference signal to noise ratio of each user is obtained according to the average power of the subcarrier signals of each user and the average power of the interference noise on the subcarriers. Preferably, the step of obtaining the average power of the subcarrier signals of each user according to the known transmission sequence of each user, for each user:

Dividing the reference signal by the known transmission sequence of the user to obtain a proportional signal of the user;

Subcarriers in the proportional signal are grouped, the number of subcarriers in each group are equal, and at least one different subcarrier exists in two adjacent groups;

Accumulating subcarriers within each group to obtain a channel response of the user;

Performing channel estimation on the channel response of the user to obtain a channel impulse response of the user;

The average power of the subcarrier signal of the user is obtained according to the channel impulse response of the user. Preferably, the step of grouping the subcarriers in the proportional signal includes:

The number of subcarriers within each group is determined based on the maximum number of users of the system and the cyclic offset of each user.

Preferably, the step of determining the number of subcarriers in each group according to the maximum number of users of the system and the cyclic offset of each user, for the user comprises determining the number of subcarriers in each group according to the following formula:

k = \ql min|a _v |;

among them:

k is the number of subcarriers in each group;

α _ν = _η _η: , VG [1, U] , which is the total number of users in the system;

a cyclic offset for the user;

For the cyclic offset of user V, _e [0, ?-l] , g is the maximum number of users of the system;

"Π" is the rounding operator.

Preferably, the subcarriers in the proportional signal are grouped, the same subcarrier does not exist in the adjacent two groups, or only one subcarrier is different.

Preferably, the step of performing channel estimation on the channel response of the user to obtain a channel impulse response of the user includes: A least square channel estimation is performed on the channel response of the user to obtain a channel impulse response of the user.

Preferably, the step of obtaining the average power of the subcarrier signal of the user according to the channel impulse response of the user, and for the user, obtaining the average power of the subcarrier signal according to the following formula:

among them:

3⁄4 _m is the average power of the subcarrier signal of the user;

k is the number of subcarriers in each group;

w is the number of groups obtained by grouping the subcarriers in the proportional signal;

H _mj is the channel impulse response of the user m.

Preferably, the number of groups _W obtained by grouping the subcarriers in the proportional signal, according to the total number of subcarriers in the proportional signal, the number of subcarriers A in each group, and the adjacent two groups are not The same number of subcarriers is determined.

In order to solve the above technical problem, the present invention also provides a carrier interference noise ratio measuring apparatus, which is applied to a wireless communication system, and includes a preprocessing module, a packet module, a user separation module, a channel estimation module, a power calculation module, and a carrier. An interference signal to noise ratio calculation module, wherein: the preprocessing module is configured to receive a reference signal, and divide the reference signal by a known transmission sequence of the user to obtain a proportional signal of the user;

The grouping module is configured to group subcarriers in the proportional signal, the number of subcarriers in each group are equal, and at least one different subcarrier exists in two adjacent groups;

The user separation module is configured to accumulate subcarriers in each group to obtain a channel response of the user;

The channel estimation module is configured to perform channel estimation on a channel response of the user, to obtain a channel impulse response of the user;

The power calculation module is configured to obtain, according to a channel impulse response of the user, an average power of the subcarrier signal of the user, and obtain an average power of the subcarrier signal of each user and a total average power of the subcarriers of the system. Average power of interference noise on subcarriers; The carrier interference signal to noise ratio calculation module is configured to obtain a carrier interference signal to noise ratio of each user according to the average power of the subcarrier signals of each user and the average power of the interference noise on the subcarriers.

Advantageously, said grouping module is arranged to determine the number of subcarriers within said group based on a maximum number of users of said system and a cyclic offset of each user.

Preferably, the grouping module is configured to determine, for the user, the number of subcarriers in each group according to the following formula:

k = \ql min|a _v |;

among them:

k is the number of subcarriers in each group;

α _ν = _{η →} :, VG[1,U] , which is the total number of users of the system;

a cyclic offset for the user;

For the cyclic offset of user V, e[0,?-l], g is the maximum number of users;

"Π" is the rounding operator.

Preferably, the grouping module is configured to group subcarriers in the proportional signal, the same subcarriers do not exist in two adjacent groups, or only one subcarrier is different.

Advantageously, the channel estimation module is configured to perform a least square channel estimation on a channel response of the user to obtain a channel impulse response of the user.

Preferably, the power calculation module is configured to: for the user, obtain the average power of the subcarrier signal according to the following formula: kw _J=0 I '

3⁄4 _m is the average power of the subcarrier signal of the user;

k is the number of subcarriers in each group;

w is the number of groups obtained by grouping the subcarriers in the proportional signal by the grouping module; and H _mj is the channel impulse response of the user m.

Preferably, the grouping module determines, according to the total number of subcarriers in the proportional signal, the number of subcarriers A in each group, and the number of subcarriers in different two groups, determining a sub The number of the groups when the carrier is grouped.

The method and device for measuring carrier-to-interference and noise ratio proposed by the present invention perform user separation in the frequency domain. Since the user separation does not transform into the time domain, no frequency selective fading, channel time-varying or receiver time-shifting is introduced. Causes errors caused by signal power leakage, which can reduce the effects of frequency selective fading, channel time-varying or signal-time leakage caused by signal bias on the signal power, thereby improving frequency selective fading, channel time-varying or receiver. The accuracy of the downloading wave interference signal-to-noise ratio measurement is relatively large; the channel estimation and demodulation performance are improved greatly; and the complexity of the implementation is relatively low.

Other features and advantages of the invention will be set forth in the description which follows, The objectives and other advantages of the invention may be realized and obtained by the structure particularly pointed in the appended claims. BRIEF abstract

The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawings: FIG. 1 is a schematic diagram of a carrier interference noise ratio measurement process of multiple users in the prior art; FIG. 2 is a schematic flowchart of a method for measuring a carrier interference noise ratio according to the present invention;

3 is a schematic diagram showing the composition of a measuring device for carrier-to-interference and noise ratio according to the present invention;

4 is a PUSCH pilot structure diagram;

Figure 5 is a structural diagram of the Sounding reference signal. Preferred embodiment of the invention

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and embodiments, in which the present invention can be applied to the technical problems, and the implementation of the technical effects can be fully understood and implemented. It should be noted that, if not conflicting, the embodiments of the present invention and the various features in the embodiments may be combined with each other, and are all within the protection scope of the present invention. Additionally, the steps illustrated in the flowchart of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although the logical order is illustrated in the flowchart, in some cases, may be different The steps shown or described are performed in the order herein.

Applicants consider the existing method of measuring the carrier-to-interference and noise ratio. The method of separating the users by time-domain transform introduces errors caused by frequency-selective fading, channel time-varying, or receiver-time bias caused by signal power leakage. In the present invention, a scheme for separating users in the frequency domain is proposed to improve the accuracy of frequency-selective fading, channel time-varying, or receiver-time biased download wave interference signal-to-noise ratio measurement. The technical solution of the present invention is applicable to a wireless communication system. The following is a virtual MIMO system. The specific solution of the present invention mainly includes the following contents:

In a virtual MIMO system, the signal is: (3)

among them:

The total number of users in the virtual MIMO system;

V G [ ] ;

H _v is the channel impulse response of user V;

The cyclic offset for user V, _e [0, gl];

g is the maximum number of users on virtual MIMO;

The mother code sequence of the pilot;

N7 is interference noise.

In fact, the technical solution of the present invention is not only applicable to a virtual MIMO system, as long as the reference signal received by the receiver satisfies the structure of the formula (3), the technical solutions of the present invention can be used, such as various code division multiplexing systems. Wait.

FIG. 2 shows a process flow for acquiring a carrier-to-interference and noise ratio of an arbitrary user m in a MIMO system. As shown in FIG. 2, the method mainly includes the following steps:

Step S201: receiving the reference signal Y, obtained according to the known transmission sequence »JT of the user m The proportional signal of the user m, specifically, dividing the reference signal by the known transmission sequence e ^{j 2πη} " ^/q of the user m, obtaining the proportional signal ii _{m of the} user m: for the receiver, the user m has Knowing that the transmission sequence is known, the proportional signal A _m of the user m in the expression (3) is deformed into the expression (4):

H _m =7*(e ^2OT " ^/ ^3⁄4 )*

= H _v e ^{] 2πη} " ^{, q} X + NI) * ((e ^]2m " ^lq X)*)

+ H _v e ^{l2 q} +ΝΪ (4) where:

ΝΪ =M/(e ^j2 ^' ^q X)

Conjugation of representation; [ ].

Since the known transmission sequence ^» of user m is a normalized signal, N/' has the same mean and variance as N7.

Step S202: Calculate A = ^/min|a _v |], group the subcarriers in the proportional signal of the user m, and divide the adjacent A subcarriers into one group, and the adjacent A subgroups in each group The carrier values are as shown in the following expression (5-1) and expression (5-2) expression (5-k):

H _mi = H _mi + 2 H _v (5-1)

H _m , _+l =H _m , ₊₁ +∑H _v , ₊₁ ^ ^ ^(!+1)/3⁄4 +∑ (5-2)

H _m ^ =H _m ^_ _{x +} ∑H _v ;—"'q +∑ H; ^+k -wq +m _+k _ _l ( 5-k ) Where iG[0,nk] , w is the total number of subcarriers;

When subcarriers in the proportional signal of the user m are grouped, at least one different subcarrier may exist in the adjacent two groups; preferably, the same two groups may not exist in the adjacent two groups. Subcarriers, or only one subcarrier is different; of course, other packet modes may be used, for example, two adjacent subcarriers exist in two groups; in fact, as long as subcarriers in each group are guaranteed A neighboring subcarriers (or A consecutive subcarriers) and at least one different subcarrier in the adjacent two groups;

The number of groups obtained by grouping is determined by the total number of subcarriers n, the number of subcarriers k in each group, and the number of subcarriers in different groups;

Among them, ""]" is the rounding operator.

Step S203: Accumulate the adjacent A subcarriers in each group to separate the user m, and obtain the channel interface of the user m:

Approximately equal response satisfying the law in accordance with sub-carrier channels in the frequency domain near the assumed _{_{Η νι = Η νι + ι =}} ··· = H vl + k _ x, expression (6) may be:

∑ H _m , _+h -∑ H _{m +h} +∑NI ₁ ' _+h (7)

Let Ο^Σ^^' Ν =∑M _L ' _+H , then the expression (7) can be changed to: Q _m kH _{mi +} N; Equation (8) After the sub-carriers of the user m are processed by the above steps , can get the channel response 0» of user m as:

Q _m =kHa _m +Na (9) where:

O^ Qd — ;

By using the above steps S201~S203, user separation can be implemented in the frequency domain, thereby effectively avoiding the separation of users in the time domain to introduce signal power leakage caused by frequency selective fading, channel time variation or receiver time offset. Insufficient error.

Step S204: Perform channel estimation on the channel response 0 of the user m, and obtain the average power of the channel subcarrier signal of the user m;

The LS (least square) channel estimation is performed on the channel response of the user m obtained according to the expression (9), and the channel impulse response of the user m can be obtained, and the average power of the sub-carrier signal of the user m can be obtained. The following formula is obtained:

Formula (10)

After step S201 to step S204, it is possible to separate any user m in the frequency domain and calculate the average power of the subcarrier signal of the user m;

The above-mentioned step butterfly is used to calculate the average power of the sub-carrier signals of all U users in the virtual MMO system, and calculate the total average power of the sub-carriers in the MIMO system. Referring to FIG. 1, the multi-user carrier interference-to-noise ratio can be continuously calculated. .

Step S205: Calculating the total average power of the sub-carriers in the MIMO system: corpse=丄∑ ² (11) Step S206: Obtaining the sub-plant according to the total average power of the sub-carriers in the MIMO system and the average power of the sub-carrier signals of all users. The average power iw of the interference noise on the wave is:

PN = P-^PS _V

v=l (12)

Step S207: According to the average power of the subcarrier signal of the user m and the average power of the interference noise on the subcarrier, the signal to noise ratio of the carrier wave obtained by the user m is:

CINR ^ (13)

PN

10

Correction page (Article 91) FIG. 3 is a schematic diagram showing the composition of an apparatus for measuring a carrier-to-interference and noise ratio according to the present invention. With reference to the method embodiment shown in FIG. 2, the apparatus embodiment shown in FIG. 3 mainly includes a preprocessing module 31, a packet module 32, a user separation module 33, a channel estimation module 34, a power calculation module 35, and a carrier interference signal to noise ratio. Calculation module 36, wherein:

The pre-processing module 31 is configured to, after receiving the reference signal Y, remove a known transmission sequence _e ^j2 Oji of the user m to be separated from the reference signal Y according to the foregoing expression (4), and obtain a proportional signal of the user m.

The grouping module 32 is configured to group the subcarriers in the proportional signal of the user m according to " _v , calculate yt = ^/mi _n |a _v |] obtained by the preprocessing module 31, so that each group includes one Adjacent subcarriers, subcarriers within each group are shown as expression (14-1), expression (14-2) expression (14-k):

H _mi = H _mi + 2 H _v ² ^" ^q + H _vl e ^{J 2} +NI Formula ( 14-1 ) v=lv=m+l

H _M , _+L

Formula ( 14-2 )

H _MK _ _X =H +∑Η; - + ∑ Η _Ν ;- ₊ ΝΙ ₁ ' ₊ Η Equation ( 14-k ) v=lv=m+l where iG[0,nk] , w is the total number of subcarriers ;

When the grouping module 32 groups the subcarriers in the proportional signal fl _m of the user m, at least one different subcarrier exists in the adjacent two groups; and according to the total number of subcarriers n, the number of subcarriers k in each group, And the number of subcarriers that are different in the adjacent two groups to determine the number of groups obtained by the group w;

The user separation module 33 is configured to accumulate subcarriers in each group of the user grouped by the grouping module 32 according to the foregoing expression (6) and the expression (7) to separate the channel response of the user, and further set The channel response Q _{m of} the user is obtained according to the foregoing expressions (8) and (9); the channel estimation module 34 is configured to perform least square (LS) channel estimation according to the channel response of the user calculated by the grouping module 32. , obtain the user's channel impulse response ^„;

The power calculation module 35 is configured to be a channel impact of the user obtained according to the channel estimation module 34. Responding to ^, obtaining the average power of the subcarrier signal of the user according to the expression (10), and obtaining the average power of the subcarrier signals of each user according to the expression (15) shown below, and also setting according to the expression (11) Obtaining the total average power of the subcarriers according to the expression (12) to obtain the average power of the interference noise on the subcarriers 7W; Equation (15)

The carrier interference SNR calculation module 36 is configured to obtain the carrier interference signal noise of the user m according to the average interference power of the interference on the subcarrier obtained by the power calculation module 35, the average power of the subcarrier signal of the user, and the foregoing expression (13). ratio.

The embodiments of the present invention will be described in detail below with specific application examples in different application scenarios. First application example:

In the LTE PUSCH, where the PUSCH pilot structure is as shown in FIG. 4, two terminal devices transmit on 48 subcarriers (ie, the aforementioned "48"), which are 0 and 6 in the first time slot, ie, 0, =6, where g is equal to 12.

Substituting , , and g into the expression (3), the pilot signal received by the receiver in this application example (a specific case of the aforementioned reference signal) is:

Y = H 〗 ^2π *. ¹² X + H ₂ e〗 ^2π * ⁶¹² X + NI ·

The user is processed according to the expression (4), that is, according to the known transmission sequence e^* ^on2 X of the user, the proportional signal of the user is obtained ^:

Then:

= min(| _v |) = 6; A = " /min| _v |] = 2.

The subcarriers in the proportional signal of the user one are grouped according to the expression (5-1) and the expression (5-2) expression (5-k). Preferably, the following two grouping modes may be selected. One: Group one: {^. A _u }, {HH ₃ }

'The number of groups obtained by grouping in this way is 1⁄4' = 24; Group 2: {A. A _U }, {Η, Ι} {^ ₄₍ Α ₄₇ }, the number of groups obtained by grouping in this way is w = 47;

According to the expressions (6) ~ (9), the channel response of the user one is obtained as follows:

Q _l = 2Ηα + Να; where:

The obtained channel response Q of the user one and the group number w determined according to the grouping manner are substituted into the expression (10), and the average signal power of the user on the subcarrier is obtained as follows:

The user 2 is processed, and according to the known transmission sequence of the user 2, the proportion signal _{J of the} user 2 is obtained _.

" ₂ =" - =- 6;

Then:

Two min(| _v |) = 6;

A = " /min| _v |] = 2.

The subcarriers in the proportional signal of the user two are grouped according to the expression (5-1) and the expression (5-2) expression (5-k). Preferably, one of the following two grouping modes may be selected. Kind, but need to be grouped in the same way as the user:

Group one: {Α ₂ ,. Α ₂₁ },

{^, ₄₆ ^. ₄₇ }, the number of groups obtained by grouping in this way is w = 24; Group 2: {A ₂ , _Q ^}, {Η ₂ Η ₂ } {^ ₄₍ Λ, ₄₇ }, the number of groups obtained by grouping in this way is 1⁄4' = 47;

According to the expressions (6) to (9), the channel response ρ ₂ of the user 2 is obtained as follows:

Q, = Ha ₂ + Na where:

Q ₂ = [Q ₂ , Q ₂

Na = [N, ₀ ,,

The resulting two users channel response and only ¾ Gen determined according to the number of groups in grouping into Expression (10), to obtain the average signal power user on two subcarriers is ₂ ¾:

According to the expression (11), the total average power P obtained on the subcarrier is:

1 47 , 2 According to the expression (12), the average noise power PN is obtained as:

PN = P-PS _l -PS ₂ ;

According to the expression (13), the carrier interference noise ratio CIN of the user one and the carrier interference noise ratio CINR^ of the user two are obtained respectively.

CINR, =

PN

CIN

^3⁄4 PN

Second application example:

In the LTE PUSCH, where the PUSCH pilot structure is as shown in FIG. 4, two terminal devices transmit on 48 subcarriers (ie, the aforementioned "48"), which are 1 and 5 in the first time slot, ie, 1 , =5, where g is equal to 12. Substituting , , and g into the expression (3), the pilot signal received by the receiver in this application example (a specific case of the aforementioned reference signal) is:

Y=H _l e ^l2!Cll2 X + H ₂ e ^{] 2π} * ^{5 η} Χ + ΝΙ .

= _{ι ι} ε ^ιπ,6 Χ + Η ₂ β ^]5π,6 Χ + ΝΙ '

The user one is processed according to the expression (4), that is, according to the known transmission sequence e ^ird6 X of the user one, the proportional signal of the user one is obtained ^:

2 = n _c ² _s -n _c ^l _s = , then " = min(|« _v |) = 4, A: = " /min|« _v |]= 3.

The subcarriers in the proportional signal of the user one are grouped according to the expression (5-1) and the expression (5-2) expression (5-k), and preferably, the following two grouping modes may be selected. One:

Group one: {θ〗 Α ₂ }, {HH ₁₄ H ₁₅ } {Η _{]Α Α} } ₇ } , the number of groups obtained by grouping in this way is w = 16; Group 2: {A,. A, A ₂ },

{H, ₄₅ H, ₄₆ H ₄₇ } , the number of groups obtained by grouping in this way is w = 46;

According to the expressions (6) ~ (9), the channel response of the user one is obtained. Q is:

Q, = 3Ha _x + Na; where:

^Ha \ = [ 1,0 ^H \,\ --- ^H \,w-\ ;

Na = [N; ₀ N; _I -N; _w _ ₁ f ;

The obtained channel response Q of the user one and the number of groups determined according to the grouping method are substituted into the expression (10), and the average signal power of the user on the subcarrier is obtained as follows:

The user 2 is processed, and according to the known transmission sequence _e ^* ^5/12 ; r of the user 2, the proportional signal of the user 2 is obtained ^: H =Η ₂ + Η _ι ε- ^]2πΙ3 +ΝΪ;

Then:

o = min(|« _v |) = 4;

The grouping is performed according to the expression (5-1) and the expression (5-2) expression (5-k). Preferably, one of the following two grouping methods may be selected, but a grouping manner with the user is required. the same:

Group one: { ^» ₂ , ₂ },

{Η _2Α ,Η _Λ6 Η _2ΑΊ } , 数 The number of groups obtained by grouping this way is w = 16;

Group 2: {H ₂₀ H ₂₁ H ₂₂ } . {Η _2Λ Η ₂₂ Η ₂ } {Η _{2 5} Η _{2 6} Η ₂ ι} ' The number of groups obtained by grouping this way is w = 46;

According to the expressions (6) ~ (9), the channel response of the user 2 is obtained as:

Q ₂ = 3Ha ₂ + Na; where:

a=[a,. Qd ] ^r ;

Ηα ₂ = [H ₂₀ H _2l ---H _2w _^;

Na = [N, ₀ N _I -N _w _ ₁ f;

The obtained channel response and two users are grouped according to the determined group number w in Expression (10), to obtain the average signal power user on two subcarriers ¾ ₂ is:

According to the expression (12), the average noise power PN is obtained as:

PN = P - PS "PS ₂ According to the expression (13), the carrier-to-interference and noise ratio of the user one and the carrier-to-interference and noise ratio CINR^ of the user two are obtained as follows:

PS, -

CINR,

PN CINR ₂ =

PN third application example:

In the LTE PUSCH, where the PUSCH pilot structure is as shown in FIG. 4, there are three terminal devices transmitting on 48 subcarriers (ie, the aforementioned "48"), which are 1, 5, 9 on the first time slot. That is, = 1, n _c ² = 5, nl = 9, where g is equal to 12.

Substituting , , , and g into the expression (3), the pilot signal received by the receiver in this application example (a specific case of the aforementioned reference signal) is:

Y = Η^ ^]2πηιη Χ + H ₂ e ^ ⁵ⁿ² X + Η ₃ ε ^{] 2π} * ^9η2 Χ + ΝΙ .

= _{ι ι} ε ^ιπ,6 Χ + Η^ ^]5π/6 Χ + Η ₃ ε ^]9πΙ6 Χ + ΝΙ ,

The user is processed according to the expression (4), that is, according to the known transmission sequence of the user, the proportional signal of the user is obtained ^:

Η _χ =Η _λ + H ₂ e ^{] 2π} ' ³ + H ₃ e ^] ' ³ + ΝΪ;

a ₂ = n _c ² _s

= 8 , then or = min(|or _v |) = 4, A"=" /min|or,.|]=3. According to the expressions (5-1) and (5-2) 5-k), grouping the subcarriers in the proportional signal of the user one, preferably, one of the following two grouping modes may be selected:

Group one: {H _L0 HH ₂ } . {Η _{λ ΛΛ} Η _{Λ 5} ) {H ₁₄₅ H ₁₄₆ H ₁₄₇ } , 组 The number of groups obtained by grouping this way is w = 16; Group 2:

{ , ₄ Α _4< Λ ₄₇ }, the number of groups obtained by grouping in this way is w = 46;

According to the expressions (6) ~ (9), the channel response Q of the user is obtained as follows:

Q ₁ = 3Haj + Na; where: Q=[Q, ₀ Q _U '"Q — J ;

N = [N; ₀ N; _] -N;; _w _ ₁ f;

The obtained channel response Q of the user one and the number of groups v determined according to the grouping manner are substituted into the expression (10), and the average signal power 用户 of the user on the subcarrier is obtained as: ps, = y H, , . The user 2 is processed, that is, according to the known transmission sequence ^'12 of the user two, the proportional signal of the user two is obtained:

H ₂ = H, e- ^{j 4πΙ3} + H ₂ + He ^{J 4π} ' ³ + ΝΙ'

2=n _c ^l _s -n _c ² _s =-A;

"3 = ⁿ i - = ⁴ ;

Then:

= min(|« _v |) = 4;

k = \ql min|o _v | = 3.

The grouping is performed by the expression (5). Preferably, one of the following two grouping methods can be selected, but it needs to be grouped in the same manner as the user:

Group one: {A ₂ . ^^ ₂ }, {H ₂ , H _2A H ₂₅ } {Η _2Α Η _2Μ Η _2ΑΊ } , the number of groups obtained by grouping in this way = 16;

Group 2: {^2,0 ^,^2,2}, {Η ₂₁ Η ₂₂ Η ₂₃ } {^2,45^2,46^2,47} ' The number of groups obtained by grouping this way W = 46;

Q ₂ = 3Ha ₂ + Na; where: α = [3⁄4 ₀ Q ₂

Ηα ₂ =[Η ₂₀ Η _2] -Η ₂ ^] ^τ ;

The resulting channel response of user two 3⁄4 and the number of groups determined according to the grouping method ^ are substituted into the expression

(10) The average signal power on the subcarriers is 3⁄4 ₂ : .

The user three is processed, and according to the known transmission sequence of the user three, the proportional signal of the user is obtained.

H ₃ = H, e- ^{] M3} + H ₂ e~ ^{J 4Π} ' ³ + H ₃ + ΝΙ ';

= - =- 4;

Then:

a = min(|a _v |) = 4;

k = \ql min|o _v | = 3.

According to the expression (5-1) and the expression (5-2) expression (5-k), the subcarriers in the proportional signal ^ of the user three are grouped, preferably, from the following two grouping modes. Choose one, but need to be grouped in the same way as User One and User Two:

Group one: { ΑΑ ₂ }, [Η , Η, _Λ Η ₅ ] { ₄ Α, ₄ Α, ₄₇ } , 组 group number obtained by grouping in this way = 16; group 2: ₃ , ₂ },

, the number of groups obtained by grouping in this way is w = 46;

According to the expressions (6) ~ (9), the channel response of the user three is obtained as:

Q ₃ = 3Ha ₃ + Na; where:

=[ rQ _w _ ;

Ha ₃ = [H ^H i, '" ^H w-\i;

The obtained channel response ft of the user three and the number of groups determined according to the grouping method are substituted into the expression

(10), obtain the average signal power of the user three on the subcarrier 3⁄4 is: W-\ ―

4w 3,

=0

3⁄4 W N

According to the expression (12), the average noise power of 7W is obtained as:

PN = P-PSfPS _{2 -} PS

According to the expression (13), the carrier-to-interference and noise ratio C/NR of the user one is obtained, respectively, and the user

The carrier-to-interference and noise ratio CINR^ and the carrier-to-interference-and-noise ratio CINR of the user three are:

CINR, =

Fourth application example:

In the LTE Sounding reference signal, the structure of the Sounding reference signal (which is a specific case of the foregoing reference signal) is as shown in FIG. 5, and two terminal devices transmit on 48 subcarriers (that is, the aforementioned w is 48). , on the first time slot are 0 and 4, ie = 0, = 4, where is equal to 8.

Substituting , , and g into expression (3), that is, the Sounding reference signal received by the receiver in this application example is:

γ = X + H ₂ e] * ⁴ X + NI .

The user one is processed according to the expression (4), that is, according to the known transmission sequence e ^jl X of the user one, the proportional signal of the user one is obtained ^:

" 2 = _ = ⁴ ;

then: The subcarriers in the proportional signal of the user one are grouped according to the expression (5-1), the expression (5-2) expression (5-k), and preferably, the following two grouping modes may be selected. One: Group one: {^A _U }, {HH ₁ } {H, ₄₆ H,47} ' The number of groups obtained by grouping in this way is 1⁄4' = 24;

Group two:

{« } {H, ₄₆ H,, ₄₇ } , the number of groups obtained by grouping this way is w = 47;

Q _] = 2Ha _l +Na; where: Q - ^f;

Na = [N; ₀ N; _i -N;; _w _ ₁ f;

The obtained channel response Q of the user one and the number of groups determined according to the grouping method are substituted into the expression (10), and the average signal power of the user on the subcarrier is obtained as ^:

The user 2 is processed, that is, according to the known transmission sequence ^4/8 of the user 2, the proportional signal of the user 2 is obtained:

r ^y2―†i ^l —n ² ―—41: ⁵

Using expression (5-1), expression (5-2) expression (5-k), for user two The subcarriers in the proportional signal are grouped. Preferably, one of the following two grouping modes may be selected, but the grouping manner is the same as that of the user: group one: {^,. }, {H^ ₂ H ₂ , ₃ } {^2,46^2,47} ' The number of groups obtained by grouping this way is w = 24;

Group 2: {Α ₂ ,. ^ }, {Η ₂ β ₂₂ } {^ ₄₍ Λ, ₄₇ }, 组 group number obtained by grouping in this way 1⁄4' = 47;

According to the expressions (6) ~ (9), the channel response of user two is obtained as ft:

, = Ηα ₂ + Να; where:

Q ₂ = [Q ₀ Q ₂ U ;

Ha ₂ = [H ₂₀ H ₂ r"H ₂ , wi ;

Να = [Ν ₂ ' ₀ Ν ₂ ' _Λ -Ν ₂ '^] ^τ ;

The obtained channel response ρ ₂ of the user ₂ and the group number w determined according to the grouping manner are substituted into the expression (10), and the average signal power 3⁄4 ₂ of the user 2 on the subcarrier is obtained as follows:

1 2

P ∑ ; According to the expression (12), the average noise power of 7W is obtained as:

PN = P-PS, -PS ₂

According to the expression (13), the carrier-to-interference and noise ratio of the user one and the carrier-to-interference and noise ratio CINR^ of the user two are obtained as follows:

CINR, =

PN

CINR, = ―

3⁄4 PN

Obviously, those skilled in the art should understand that the above modules or steps of the present invention may be Implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of computing devices, optionally, they may be implemented by program code executable by the computing device, such that They may be stored in a storage device by a computing device, or they may be fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof may be implemented as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

While the embodiments of the present invention have been described above, the described embodiments are merely for the purpose of understanding the invention and are not intended to limit the invention. Any modification and variation of the form and details of the invention may be made by those skilled in the art without departing from the spirit and scope of the invention. It is still subject to the scope defined by the appended claims.

Claims

Claim

A method for measuring a carrier interference noise ratio, which is applied to a wireless communication system, the method comprising: receiving a reference signal;

A carrier interference signal to noise ratio of each user is obtained according to the average power of the subcarrier signals of each user and the average power of the interference noise on the subcarriers.

2. The method of claim 1 wherein the step of obtaining an average power of said subcarrier signals for each user is obtained based on said known transmission sequence for each user, for each user:

Obtaining an average power of the subcarrier signal of the user according to the channel impulse response of the user.

3. The method of claim 2, the step of grouping subcarriers in the proportional signal, comprising:

4. The method according to claim 3, the step of determining the number of subcarriers in each group according to the maximum number of users of the system and the cyclic offset of each user, and determining, for the user, according to the following formula Number of subcarriers in the group: among them:

k is the number of subcarriers in each group;

α _{ν =η} _ _η =, VG[1,U] , which is the total number of users in the system;

a cyclic offset for the user;

For the cyclic offset of user V, _e [0,?-l], g is the maximum number of users of the system;

"Π" is the rounding operator.

5. The method of claim 2, wherein:

The subcarriers in the proportional signal are grouped, the same subcarrier does not exist in two adjacent groups, or only one subcarrier is different.

6. The method of claim 2, the step of performing channel estimation on the channel response of the user to obtain a channel impulse response of the user, comprising:

A least square channel estimation is performed on the channel response of the user to obtain a channel impulse response of the user.

7. The method according to claim 2, the step of obtaining the average power of the subcarrier signal of the user according to the channel impulse response of the user, and obtaining, for the user m, the average power of the subcarrier signal according to the following formula: :

W-\■ _ι where:

3⁄4 _m is the average power of the subcarrier signal of the user;

k is the number of subcarriers in each group;

H _mj is the channel impulse response of the user m.

8. The method of claim 7 wherein: And the number of the groups obtained by grouping the subcarriers in the proportional signal, according to the total number of subcarriers in the proportional signal, the number of subcarriers A in each group, and the different subgroups in the two groups The number of carriers is determined.

A measuring device for carrier interference noise ratio, which is applied to a wireless communication system, the device comprising a preprocessing module, a grouping module, a user separation module, a channel estimation module, a power calculation module and a carrier interference signal to noise ratio calculation module, wherein:

The pre-processing module is configured to receive a reference signal, and divide the reference signal by a known transmission sequence of the user to obtain a proportional signal of the user;

The power calculation module is configured to obtain, according to a channel impulse response of the user, an average power of the subcarrier signal of the user, and obtain an average power of the subcarrier signal of each user and a total average power of the subcarriers of the system. Average power of interference noise on subcarriers;

The carrier interference signal to noise ratio calculation module is configured to obtain a carrier interference signal to noise ratio of each user according to the average power of the subcarrier signals of each user and the average power of the interference noise on the subcarriers.

10. Apparatus according to claim 9 wherein:

The grouping module is arranged to determine the number of subcarriers within each group based on the maximum number of users of the system and the cyclic offset of each user.

1 1. The apparatus of claim 10, wherein:

The grouping module is configured to determine, for the user, the number of subcarriers within each of the groups according to the following formula:

k = \ql min| _v |; among them:

k is the number of subcarriers in each group;

a cyclic offset for the user;

For the cyclic offset of user V, e[0, g-1], g is the maximum number of users;

"Π" is the rounding operator.

12. Apparatus according to claim 9 wherein:

The grouping module is configured to group subcarriers in the proportional signal, the same subcarrier does not exist in two adjacent groups, or only one subcarrier is different.

13. Apparatus according to claim 9 wherein:

The channel estimation module is configured to perform a least square channel estimation on a channel response of the user to obtain a channel impulse response of the user.

14. Apparatus according to claim 9 wherein:

The power calculation module is configured to obtain, for the user m, the average power of the subcarrier signal according to the following formula: kw _J=0 I '

3⁄4 _m is the average power of the subcarrier signal of the user;

k is the number of subcarriers in each group;

^ the number of groups obtained by grouping the subcarriers in the proportional signal by the grouping module; and

H _mj is the channel impulse response of the user m.

15. Apparatus according to claim 14 wherein:

The grouping module is configured according to the total number of subcarriers in the proportional signal, and the subcarriers in each group The number A and the number of subcarriers that are different in the adjacent two groups determine the number W of the groups when the subcarriers in the proportional signal are grouped.