WO2011035507A1 - 一种载波干扰噪声比的测量方法及装置 - Google Patents

一种载波干扰噪声比的测量方法及装置 Download PDF

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Publication number
WO2011035507A1
WO2011035507A1 PCT/CN2009/075134 CN2009075134W WO2011035507A1 WO 2011035507 A1 WO2011035507 A1 WO 2011035507A1 CN 2009075134 W CN2009075134 W CN 2009075134W WO 2011035507 A1 WO2011035507 A1 WO 2011035507A1
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user
subcarriers
signal
average power
subcarrier
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PCT/CN2009/075134
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English (en)
French (fr)
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苏小明
姚春峰
余秋星
刘巧艳
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中兴通讯股份有限公司
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Publication of WO2011035507A1 publication Critical patent/WO2011035507A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/309Measuring or estimating channel quality parameters
    • H04B17/336Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation
    • H04L25/0204Channel estimation of multiple channels
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0014Three-dimensional division
    • H04L5/0023Time-frequency-space

Definitions

  • 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.
  • CINR Carrier to Interference and Noise Ratio
  • MIM0 Multi-Input Multiple-Out-put
  • 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.
  • 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:
  • H the channel impulse response of the user, and is the cyclic offset of the user
  • ⁇ 2 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
  • N/ represents the interference noise
  • H Hje 112 + H 2 e j 2ml 112 + ⁇ ⁇ ( 2 )
  • NI' NI IX , Since; ⁇ is a normalized signal, N/' has the same mean and variance as N7.
  • 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.
  • the algorithm may overlap in the time domain, and the signals between users overlap in the time domain, which leads to inaccurate CINR measurement.
  • 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.
  • 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:
  • 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.
  • 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;
  • the average power of the subcarrier signal of the user is obtained according to the channel impulse response of the user.
  • 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.
  • 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 is the number of subcarriers in each group
  • ⁇ ⁇ ⁇ _ ⁇ : , VG [1, U] , which is the total number of users in the system;
  • g is the maximum number of users of the system
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the grouping module is configured to determine, for the user, the number of subcarriers in each group according to the following formula:
  • k is the number of subcarriers in each group
  • ⁇ ⁇ ⁇ ⁇ :, VG[1,U] , which is the total number of users of the system;
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • FIG. 3 is a schematic diagram showing the composition of a measuring device for carrier-to-interference and noise ratio according to the present invention
  • Figure 5 is a structural diagram of the Sounding reference signal. Preferred embodiment of the invention
  • 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:
  • the signal is: (3)
  • the total number of users in the virtual MIMO system is the total number of users in the virtual MIMO system.
  • H v is the channel impulse response of user V
  • g is the maximum number of users on virtual MIMO
  • N7 is interference noise.
  • 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.
  • 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 2 ⁇ " /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):
  • N/' Since the known transmission sequence ⁇ » of user m is a normalized signal, N/' has the same mean and variance as N7.
  • 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;
  • subcarriers in the proportional signal of the user m 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;
  • 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:
  • 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.
  • the multi-user carrier interference-to-noise ratio can be continuously calculated. .
  • the average power iw of the interference noise on the wave is:
  • 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:
  • 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.
  • 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 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 ⁇ increment;
  • LS least square
  • the power calculation module 35 is configured to be a channel impact of the user obtained according to the channel estimation module 34.
  • 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)
  • 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 pilot signal received by the receiver in this application example (a specific case of the aforementioned reference signal) is:
  • 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 ⁇ :
  • 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).
  • the following two grouping modes may be selected.
  • Group one ⁇ .
  • Group 2 ⁇ A.
  • 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 .
  • 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).
  • one of the following two grouping modes may be selected. kind, but need to be grouped in the same way as the user:
  • the channel response ⁇ 2 of the user 2 is obtained as follows:
  • the total average power P obtained on the subcarrier is:
  • the average noise power PN is obtained as:
  • PN P-PS l -PS 2 ;
  • the carrier interference noise ratio CIN of the user one and the carrier interference noise ratio CINR ⁇ of the user two are obtained respectively.
  • the pilot signal received by the receiver in this application example is:
  • 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 ⁇ :
  • 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.
  • 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 grouping is performed according to the expression (5-1) and the expression (5-2) expression (5-k).
  • one of the following two grouping methods may be selected, but a grouping manner with the user is required. the same:
  • Group 2 ⁇ H 20 H 21 H 22 ⁇ . ⁇ 2 ⁇ ⁇ 22 ⁇ 2 ⁇ ⁇ 2 5 ⁇ 2 6 ⁇ 2 ⁇ '
  • ⁇ 2 [H 20 H 2l ---H 2w _ ⁇ ;
  • Na [N, 0 N I -N w _ 1 f;
  • the total average power P obtained on the subcarrier is:
  • the average noise power PN is obtained as:
  • the pilot signal received by the receiver in this application example (a specific case of the aforementioned reference signal) is:
  • 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 ⁇ :
  • 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 ⁇ . ⁇ ⁇ ⁇ ⁇ 5 ) ⁇ H 145 H 146 H 147 ⁇ , ⁇
  • Group 2: ⁇ , 4 ⁇ 4 ⁇ ⁇ 47 ⁇ , the number of groups obtained by grouping in this way is w 46;
  • N [N; 0 N; ] -N;; w _ 1 f;
  • 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 4 ⁇ 3 + H 2 + He J 4 ⁇ ' 3 + ⁇ '
  • the grouping is performed by the expression (5).
  • one of the following two grouping methods can be selected, but it needs to be grouped in the same manner as the user:
  • ⁇ 2 [ ⁇ 20 ⁇ 2] - ⁇ 2 ⁇ ] ⁇ ;
  • 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 4 ⁇ ' 3 + H 3 + ⁇ ';
  • 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:
  • Ha 3 [H H i, '" H w- ⁇ i;
  • the total average power P obtained on the subcarrier is:
  • the average noise power of 7W is obtained as:
  • 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:
  • 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 ⁇ :
  • 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.
  • Na [N; 0 N; i -N;; w _ 1 f;
  • 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:
  • expression (5-2) expression (5-k) for user two
  • the subcarriers in the proportional signal are grouped.
  • 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 ⁇ '
  • Ha 2 [H 20 H 2 r"H 2 , wi ;
  • the total average power P obtained on the subcarrier is:
  • PN P-PS, -PS 2
  • 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:
  • 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.
  • 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.
  • the invention is not limited to any specific combination of hardware and software.

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Description

一种载波干扰噪声比的测量方法及装置
技术领域
本发明涉及无线通信***,特别涉及一种 CINR( Carrier to Interference and Noise Ratio, 载波干扰噪声比) 的测量方法及装置。
背景技术
在无线技术中, 多个输入和多个输出或者 MIM0 ( Multiple-Input Multiple-Out-put, 多输入多输出)限定多个天线在发送器和接收器处的使用, 以便提高通信性能。
比如, 虚拟 MIMO是一种提高移动通信***的上行链路无线接入中的小 区吞吐量的通信技术, 其中即使发送器具有单个天线, 该虚拟 MIM0仍然允 许站点在同一个频带和时间同时发送信号到多个用户或者从多个用户接收信 号。 通过在两个或者更多发送器或者移动设备之间共享资源, 来增加单独发 送器的总吞吐量。 通常, 对于上行链路或者从移动设备到基站的发送而言, 可以形成在相同资源上进行发送的成对用户从而形成这一虚拟 MIM0***, 然而多于两个用户也可以用来形成这一虚拟 MIM0***。
在虚拟 MIM0***等 MIM0***中,每个子载波上都包含两个部分的功 率, 一部分是信号功率, 另一部分是干扰噪声功率。 载波干扰噪声比的测试 流程如图 1所示, 是测量一定时间范围内期望用户占用的子载波上的信号功 率和干扰噪声功率的比值, 它是反映信道质量的重要参数, 是自适应码率调 制、 功率控制等的必须统计量。
与本发明有关的现有技术提供了一种虚拟 MIM0***中载波干扰信噪比 的测量算法, 以 LTE PUSCH ( Physical Uplink Share Channel, 物理上行共享 信道 )虚拟 MIM0两用户为例, 其具体实施过程如下:
设接收机接收到的导频信号为:
Y = Η 2 luX + H2ej 2ml luX + NI 式( 1 ) 其中 H为用户一的信道冲击响应, 为用户一的循环偏移, ^2为用户二 的信道冲击响应, 为用户二的循环偏移, ;r为导频信号的母码序列, N/表 示干扰噪声。
对于接收机来说; r是已知的, 因此表达式(1 ) 可以变形为
H = Hje 112 + H2ej 2ml 112 + Νϊ ^ ( 2 ) NI' = NI I X , 由于; Γ是归一化的信号, 所以 N/'与 N7有相同的均值和 方差。 另外, ή = Y I X , 表示接收到的导频信号 与导频信号母码序列; 的比 值。
把 A进行《点离散傅里叶逆变换(IDFT ) 变换到时域, 通过 可以确定 用户一时域信号所在的区间,然后在该区间来计算用户一信号功率,通过 以 确定用户二时域信号所在的区间, 然后在该区间来计算用户二信号功率。 在 通过总功率减去用户一和用户二的信号功率来计算干扰噪声功率, 从而得到 载波干扰噪声比。
然而, 该算法在多径信道情况下, 会出现用户信号和噪声在时域存在重 叠, 用户之间的信号在时域存在重叠的情况, 进而导致 CINR测量不准确。
发明内容
本发明所要解决的技术问题, 在于需要提供一种载波干扰噪声比的测量 方法及装置, 提高载波干扰噪声比的测量准确度。
为了解决上述技术问题, 本发明首先提供了一种载波干扰噪声比的测量 方法, 应用于无线通信***, 该方法包括:
接收参考信号;
根据每个用户的已知发送序列, 从所述参考信号中分别获得每个用户的 子载波信号平均功率;
根据所述***的子载波总平均功率及所述每个用户的子载波信号平均功 率, 获得子载波上干扰噪声平均功率; 以及
根据所述每个用户的子载波信号平均功率及所述子载波上干扰噪声平均 功率, 获得每个用户的载波干扰信噪比。 优选地, 根据所述每个用户的已知发送序列分别获得所述每个用户的子 载波信号平均功率的步骤, 对于每个用户:
将所述参考信号除以所述用户的已知发送序列, 得到所述用户的比例信 号;
对所述比例信号中的子载波进行分组, 每组内的子载波数量均相等, 且 相邻两组内至少存在一个不相同的子载波;
将每组内的子载波累加, 得到所述用户的信道响应;
对所述用户的信道响应进行信道估计, 获得所述用户的信道冲击响应; 以及
才艮据所述用户的信道冲击响应, 获得所述用户的子载波信号平均功率。 优选地, 对所述比例信号中的子载波进行分组的步骤, 包括:
根据***的最大用户数以及每个用户的循环偏移, 确定所述每组内的子 载波数量。
优选地, 根据所述***的最大用户数以及每个用户的循环偏移确定所述 每组内的子载波数量的步骤, 对于用户 包括根据下式确定所述每组内的 子载波数量:
k = \ql min|av |;
其中:
k为所述每组内的子载波数量;
αν = η _η: , V G [1, U] , 为***中的用户总数;
为用户 的循环偏移;
为用户 V的循环偏移, e [0, ?- l] , g为所述***的最大用户数; 以及
"Π" 为取整运算符。
优选地, 对所述比例信号中的子载波进行分组, 相邻两组内不存在相同 的子载波, 或者仅存在一个不相同的子载波。
优选地, 对所述用户的信道响应进行信道估计获得所述用户的信道冲击 响应的步骤, 包括: 对所述用户的信道响应进行最小平方信道估计, 获得所述用户的信道冲 击响应。
优选地, 根据所述用户的信道冲击响应获得所述用户的子载波信号平均 功率的步骤, 对于用户 , 包括根据下式获得所述子载波信号平均功率:
Figure imgf000006_0001
其中:
¾m为所述用户 的子载波信号平均功率;
k为所述每组内的子载波数量;
w为对所述比例信号中的子载波进行分组得到的组数; 以及
Hm j为所述用户 m的信道冲击响应。
优选地, 对所述比例信号中的子载波进行分组得到的所述组数 W , 根据 所述比例信号中的子载波总数、 所述每组内的子载波数量 A以及相邻两组内 不相同的子载波数确定。
为了解决上述技术问题, 本发明还提供了一种载波干扰噪声比的测量装 置, 应用于无线通信***, 该装置包括预处理模块、 分组模块、 用户分离模 块、 信道估计模块、 功率计算模块以及载波干扰信噪比计算模块, 其中: 所述预处理模块, 设置为接收参考信号, 并将所述参考信号除以用户的 已知发送序列, 得到所述用户的比例信号;
所述分组模块, 设置为对所述比例信号中的子载波进行分组, 每组内的 子载波数量均相等, 且相邻两组内至少存在一个不相同的子载波;
所述用户分离模块, 设置为将每组内的子载波累加, 得到所述用户的信 道响应;
所述信道估计模块, 设置为对所述用户的信道响应进行信道估计, 获得 所述用户的信道冲击响应;
所述功率计算模块, 设置为根据所述用户的信道冲击响应, 获得所述用 户的子载波信号平均功率, 并根据每个用户的子载波信号平均功率及所述系 统的子载波总平均功率获得子载波上干扰噪声平均功率; 以及 所述载波干扰信噪比计算模块, 设置为根据所述每个用户的子载波信号 平均功率及所述子载波上干扰噪声平均功率, 获得每个用户的载波干扰信噪 比。
优选地, 所述分组模块设置为根据所述***的最大用户数以及每个用户 的循环偏移, 确定所述每组内的子载波数量。
优选地, 所述分组模块设置为对于用户 , 包括根据下式确定所述每组 内的子载波数量:
k = \ql min|av |;
其中:
k为所述每组内的子载波数量;
αν=η →:, VG[1,U] , 为所述***的用户总数;
为用户 的循环偏移;
为用户 V的循环偏移, e[0,?-l], g为所述最大用户数; 以及
"Π"为取整运算符。
优选地, 所述分组模块设置为对所述比例信号中的子载波进行分组, 相 邻两组内不存在相同的子载波, 或者仅存在一个不相同的子载波。
优选地, 所述信道估计模块设置为对所述用户的信道响应进行最小平方 信道估计, 获得所述用户的信道冲击响应。
优选地, 所述功率计算模块设置为对于用户 包括根据下式获得所述 子载波信号平均功率: k w J=0 I ' 其中:
¾m为所述用户 的子载波信号平均功率;
k为所述每组内的子载波数量;
w为所述分组模块对所述比例信号中的子载波进行分组得到的组数; 以 及 Hm j为所述用户 m的信道冲击响应。
优选地, 所述分组模块根据所述比例信号中的子载波总数、 所述每组内 的子载波数量 A以及相邻两组内不相同的子载波数, 确定对所述比例信号中 的子载波进行分组时的所述组数 ^。
本发明提出的一种载波干扰噪声比的测量方法及装置, 在频域上进行用 户分离, 由于用户分离没有变换到时域, 因此没有引入因频率选择性衰落、 信道时变或者接收机时偏引起信号功率泄露带来的误差, 可以减少频率选择 性衰落、信道时变或者接收机时偏引起信号功率泄露对信号功率造成的影响, 从而提高在频率选择性衰落、 信道时变或者接收机时偏情况下载波干扰信噪 比测量的准确度; 对于后面的信道估计和解调性能都有较大的提高; 而且该 方案实现的复杂度比较低。
本发明的其它特征和优点将在随后的说明书中阐述, 并且, 部分地从说 明书中变得显而易见, 或者通过实施本发明而了解。 本发明的目的和其他优 点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。 附图概述
附图用来提供对本发明的进一步理解, 并且构成说明书的一部分, 与本 发明的实施例一起用于解释本发明, 并不构成对本发明的限制。 在附图中: 图 1是现有技术中多个用户的载波干扰噪声比测量流程示意图; 图 2是本发明一种载波干扰噪声比的测量方法流程示意图;
图 3是本发明一种载波干扰噪声比的测量装置组成示意图;
图 4是 PUSCH导频结构图;
图 5是 Sounding参考信号结构图。 本发明的较佳实施方式
以下将结合附图及实施例来详细说明本发明的实施方式, 借此对本发明 如何应用技术手段来解决技术问题, 并达成技术效果的实现过程能充分理解 并据以实施。 需要说明的是, 如果不冲突, 本发明实施例以及实施例中的各个特征可 以相互结合, 均在本发明的保护范围之内。 另外, 在附图的流程图示出的步 骤可以在诸如一组计算机可执行指令的计算机***中执行, 并且, 虽然在流 程图中示出了逻辑顺序, 但是在某些情况下, 可以以不同于此处的顺序执行 所示出或描述的步骤。
申请人考虑到现有的载波干扰噪声比的测量方法中, 釆用时域变换分离 用户的方式会引入因频率选择性衰落、 信道时变或者接收机时偏引起信号功 率泄露带来的误差, 因此本发明中提出一种在频域上分离用户的方案, 以提 高频率选择性衰落、 信道时变或者接收机时偏情况下载波干扰信噪比测量的 准确度。本发明技术方案适用于无线通讯***,以下以虚拟 MIMO***为例, 本发明的具体方案主要包括如下内容:
在虚拟 MIMO***中, 信号 为: 式( 3 )
Figure imgf000009_0001
其中:
为虚拟 MIMO***中的用户总数;
V G [ ] ;
Hv为用户 V的信道冲击响应;
为用户 V的循环偏移, e [0,g-l] ;
g为虛拟 MIMO上的最大用户数;
为导频的母码序列;
N7为干扰噪声。
实际上, 本发明的技术方案不仅仅适用于虚拟 MIMO***, 只要是接收 机接收到的参考信号满足式(3 )的结构, 都可以釆用本发明技术方案, 比如 各种码分复用***等。
图 2示出了 MIMO***中获取一任意用户 m的载波干扰噪声比的方法流 程, 如图 2所示, 该方法主要包括如下步骤:
步骤 S201 : 接收参考信号 Y, 根据用户 m的已知发送序列 »JT得到 用户 m的比例信号^„ , 具体地, 将参考信号 Υ除以用户 m的已知发送序列 ej 2πη" /q , 得到用户 m的比例信号 iim: 对于接收机来说, 用户 m的已知发送序列 是已知的, 将表达式 (3) 中的用户 m的比例信号 Am变形为表达式(4) :
Hm =7*(e 2OT" )*
= Hve] 2πη" ,qX + NI) * ((e]2m" lqX)*)
Figure imgf000010_0001
+ Hvel2 q +ΝΪ 式( 4 ) 其中:
ΝΪ =M/(ej2^'qX)
表示 的共轭; [ ]。
由于用户 m的已知发送序列^» 是归一化的信号,所以 N/'与 N7有相 同的均值和方差。
步骤 S202: 计算 A = ^/min|av|] , 对用户 m的比例信号^„中的子载波进行 分组, 将相邻的 A个子载波分为一组, 每组内相邻的 A个子载波分别为如下述 表达式(5-1 ) 、 表达式(5-2) 表达式(5-k)所示:
Hm i = Hm i + 2 Hv 式( 5- 1 )
Figure imgf000010_0002
Hm,+l =Hm,+1+∑Hv,+1^ ^(!+1)/¾ +∑ 式( 5-2 )
Hm^ =Hm^_x +∑Hv;—-"'q +∑ H; +k-wq +m+k_l 式( 5-k ) 其中, iG[0,n-k] , w为子载波总数;
在对用户 m的比例信号^„中的子载波进行分组时,可以令相邻的两组内 至少存在一个不相同的子载波; 较佳地, 可以令相邻的两组内不存在相同的 子载波, 或者仅存在一个不相同的子载波; 当然也可以釆用其他分组方式, 例如相邻的两组内存在 2个不相同的子载波; 实际上, 只要保证每组内的子 载波为 A个相邻的子载波(或者说 A个连续的子载波)且相邻两组内至少存在 一个不相同的子载波即可;
分组得到的组数 w由子载波总数 n、每组内的子载波数 k, 以及相邻两组 内不相同的子载波数来确定;
其中, "「]" 为取整运算符。
步骤 S203: 将每组内相邻的 A个子载波累加, 以分离用户 m, 得到用户 m的信道口向应:
Figure imgf000011_0001
根据在频域靠近的子载波信道响应满足近似相等的规律, 假设 Ηνι = Ηνι+ι =··· = Hvl+k_x , 则表达式 (6)可为:
∑ Hm,+h -∑ Hm +h +∑ NI1'+h 式( 7 )
令 Ο^Σ^^' Ν =∑ML'+H , 则表达式(7) 可以变为: Qm kHmi + N; 式(8) 将用户 m的各组子载波经上述步骤处理后,可以得到用户 m的信道响应 0»为:
Qm=kHam+Na 式(9) 其中:
O^ Qd — ;
Figure imgf000011_0002
采用上述步骤 S201~S203即可在频域上实现用户分离, 从而有效地避免 了在时域上分离用户会引入因频率选择性衰落、 信道时变或者接收机时偏引 起信号功率泄露带来的误差的不足。
步骤 S204: 对用户 m的信道响应 0„进行信道估计, 得到用户 m的信道 子栽波信号平均功率;
对根据表达式(9 )获得的用户 m的信道响应 进行 LS ( least square, 最小平方)信道估计, 可以得到用户 m的信道冲击响应^„, 用户 m的子栽 波信号平均功率 可以 4艮据下式得出:
式(10 )
Figure imgf000012_0001
经过上迷步骤 S201〜步骤 S204, 即可实现在频域上分离出任意用户 m, 并计算出该用户 m的子栽波信号平均功率;
采用上述步蝶分别计算虚拟 MMO***中的所有的 U个用户的子栽波信 号平均功率, 并计算出 MIMO***中子载波总平均功率, 参考图 1, 即可继 续计算多用户载波干扰噪声比。
步骤 S205: 计算 MIMO***中子栽波总平均功率尸: 尸=丄∑ 2 式(11 ) 步骤 S206:根据 MIMO***中子载波总平均功率以及所有用户的子栽波 信号平均功率, 获得子栽波上干扰噪声平均功率 iw为:
PN = P-^PSV
v=l 式(12 )
Figure imgf000012_0002
步骤 S207:根据用户 m的子载波信号平均功率以及子载波上千扰噪声平 均功率, 获得用户 m的栽波干扰信噪比 为:
CINR ^ 式(13 )
PN
10
更正页 (细则第 91条) 图 3为本发明载波干扰噪声比的测量装置实施例的组成示意图。 结合图 2所示的方法实施例, 图 3所示的该装置实施例主要包括预处理模块 31、 分 组模块 32、 用户分离模块 33、 信道估计模块 34、 功率计算模块 35以及载波 干扰信噪比计算模块 36, 其中:
预处理模块 31, 设置为接收到参考信号 Y后, 根据前述表达式(4)从 参考信号 Y中去除一欲分离得到的用户 m的已知发送序列 e j2Oji , 得到用 户 m的比例信号
分组模块 32, 设置为根据预处理模块 31得到的《v, 计算 yt = ^/min|av|], 对用户 m的比例信号^„中的子载波进行分组,令每组包含 Α个相邻的子载波, 每组内的子载波分别如表达式( 14-1 )、 表达式( 14-2) 表达式( 14-k) 所示:
Hm i = Hm i + 2 Hv 2^"q + Hv leJ 2 +NI 式( 14- 1 ) v=l v=m+l
HM,+L
Figure imgf000013_0001
式( 14-2 )
HM K_X =H +∑Η; - + ∑ ΗΝ;— +ΝΙ1'+Η 式( 14-k ) v=l v=m+l 其中, iG[0,n-k] , w为子载波总数;
分组模块 32对用户 m的比例信号 flm中的子载波进行分组时, 令相邻两 组内至少存在一个不相同的子载波; 以及根据子载波总数 n、 每组内的子载 波数 k, 以及相邻两组内不相同的子载波数来确定分组得到的组数 w;
用户分离模块 33, 设置为根据前述表达式(6)及表达式(7) , 对分组 模块 32分出的该用户各组内的子载波进行累加,以分离得到该用户的信道响 应, 还设置为根据前述表达式( 8 )及表达式( 9 )得到该用户的信道响应 Qm; 信道估计模块 34, 设置为根据分组模块 32计算出的用户的信道响应, 进行最小平方 (LS)信道估计, 获得用户的信道冲击响应^„;
功率计算模块 35, 设置为根据信道估计模块 34获得的用户的信道冲击 响应^„, 根据表达式(10 )获得用户的子载波信号平均功率, 以及根据如下 所示的表达式(15 )分别获得各用户的子载波信号平均功率, 还设置为根据 表达式(11 )获得子载波总平均功率 根据表达式(12 )获得子载波上干 扰噪声平均功率 7W; 式( 15 )
Figure imgf000014_0001
载波干扰信噪比计算模块 36, 设置为根据功率计算模块 35获得的子载 波上干扰噪声平均功率 7W、 用户的子载波信号平均功率以及前述表达式 ( 13 ) , 获得用户 m的载波干扰信噪比。
下面将以不同应用场景下的具体应用实例来详细说明本发明实施方案。 第一应用实例:
在 LTE PUSCH中, 其中 PUSCH导频结构如图 4所示, 2个终端设备在 48个子载波(即前述的《为 48 )上进行传输, 在第一个时隙上为 0和 6, 即 =0, =6, 这里的 g等于 12。
将 、 , 以及 g代入表达式(3 ) , 在本应用实例中接收机接收到的导 频信号 (为前述参考信号的一种具体情形)为:
Y = H 〗 *。 12 X + H 2e〗 *612 X + NI ·
Figure imgf000014_0002
根据表达式 (4 ) 对用户一进行处理, 即根据用户一的已知发送序列 e^*on2X , 得到用户一的比例信号^:
Figure imgf000014_0003
则:
= min(| v|) = 6; A =「 /min| v|] = 2。
根据表达式(5-1 ) 、 表达式(5-2 ) 表达式(5-k) , 对用户一的 比例信号 中的子载波进行分组, 较佳地, 可以从以下两种分组方式中选取 一种: 分组一: {^。Au}、 {H H3}
Figure imgf000015_0001
' 采用该方式分组所得到的 组数 ¼' = 24; 分组二: {A。AU}、 {Η, Ι} {^4(Α47}, 采用该方式分组所得到的 组数 w = 47;
根据表达式(6) ~ (9) , 得到用户一的信道响应 为:
Ql = 2Ηα + Να; 其中:
Figure imgf000015_0002
将得到的用户一的信道响应 Q和根据分组方式确定的组数 w代入表达式 (10) , 获得用户一在子载波上的平均信号功率 ^为:
Figure imgf000015_0003
对用户二进行处理,根据用户二的已知发送序列 ,得到用户二的 比例信号J
Figure imgf000015_0004
"2=" - =- 6;
则:
二 min(| v|) = 6;
A =「 /min| v|] = 2。
根据表达式(5-1 ) 、 表达式(5-2) 表达式(5-k)对用户二的比 例信号 中的子载波进行分组, 较佳地, 可以从以下两种分组方式中选取一 种, 但是需要与用户一的分组方式相同:
分组一: {Α2,。Α21}、
Figure imgf000015_0005
{^,46^.47}, 采用该方式分组所得到 的组数 w = 24; 分组二: {A2,Q^}、 {Η2 Η 2} {^4(Λ,47},采用该方式分组所得到 的组数¼' = 47;
根据表达式(6)〜 (9) , 得到用户二的信道响应 ρ2为:
Q、 = Ha2 + Na 其中:
Q2=[Q2, Q2
Figure imgf000016_0001
Na = [N,0 ,,
将得到的用户二的信道响应 ¾和才艮据分组方式确定的组数 代入表达式 (10) , 获得用户二在子载波上的平均信号功率 ¾2为:
Figure imgf000016_0002
根据表达式(11 ) , 获得子载波上的总平均功率 P为:
1 47 , 2 根据表达式 (12) , 获得噪声平均功率 PN为:
PN = P-PSl-PS2;
根据表达式( 13 ) , 分别获得用户一的载波干扰噪声比 CIN 及用户二的 载波千扰噪声比 CINR^为
CINR, =
PN
CIN
¾ PN
第二应用实例:
在 LTEPUSCH中, 其中 PUSCH导频结构如图 4所示, 2个终端设备在 48个子载波(即前述的《为 48)上进行传输, 在第一个时隙上为 1和 5, 即 =1, =5, 这里的 g等于 12。 将 、 , 以及 g代入表达式(3) , 在本应用实例中接收机接收到的导 频信号 (为前述参考信号的一种具体情形)为:
Y=Hlel2!Cll2X + H2e] 2π*5 ηΧ + ΝΙ .
= Ηιειπ,6Χ + Η2β]5π,6Χ + ΝΙ '
根据表达式( 4 )对用户一进行处理,即根据用户一的已知发送序列 eird6X, 得到用户一的比例信号^:
Figure imgf000017_0001
2 = nc 2 s -nc l s= , 则" = min(|«v|) = 4, A: =「 /min|«v|]= 3。
根据表达式(5-1 ) 、 表达式(5-2) 表达式(5-k) , 对用户一的 比例信号 中的子载波进行分组, 较佳地, 可以从以下两种分组方式中选取 一种:
分组一: {θ〗Α2}、 {H H14H15} {ΗΑΛΑ7} ,釆用该方式分组 所得到的组数 w = 16; 分组二: {A,。A,A2}、
Figure imgf000017_0002
{H,45H,46H47} ,釆用该方式分组 所得到的组数 w = 46;
根据表达式(6) 〜(9) , 得到用户一的信道响应 Q为:
Q, = 3Hax + Na; 其中:
Ha\ = [ 1,0 H\,\ ---H\,w-\ ;
Na = [N;0N;I-N;w_1f ;
将得到的用户一的信道响应 Q和根据分组方式确定的组数 ^代入表达式 ( 10) , 获得用户一在子载波上的平均信号功率 为:
对用户二进行处理,根据用户二的已知发送序列 e^*5/12;r ,得到用户二的 比例信号^: H =Η2 + Ηιε-]2πΙ3 +ΝΪ;
则:
o = min(|«v|) = 4;
根据表达式(5-1 ) 、 表达式(5-2) 表达式(5-k)进行分组, 较 佳地, 可以从以下两种分组方式中选取一种, 但是需要与用户一的分组方式 相同:
分组一: { ^»2,2}、
Figure imgf000018_0001
Λ6Η2ΑΊ} , 釆用该方式分 组所得到的组数 w = 16;
分组二: {H20H21H22} . {ΗΗ22Η2 } {Η2 5Η2 6Η2 ι} ' 釆用该方式分 组所得到的组数 w = 46;
根据表达式(6) ~ (9) , 得到用户二的信道响应 ¾为:
Q2 = 3Ha2 + Na; 其中:
a=[a,。 Qd ]r;
Ηα2 = [H20 H2l---H2w_^;
Na = [N,0N I-N w_1f;
将得到的用户二的信道响应 和根据分组方式确定的组数 w代入表达式 (10) , 获得用户二在子载波上的平均信号功率 ¾2为:
Figure imgf000018_0002
根据表达式(11 ) , 获得子载波上的总平均功率 P为: ;
Figure imgf000018_0003
根据表达式(12) , 获得噪声平均功率 PN为:
PN =P—PS「PS2 根据表达式(13) , 分别获得用户一的载波干扰噪声比 及用户二的 载波干扰噪声比 CINR^为:
PS, -
CINR,
PN CINR2 =
PN 第三应用实例:
在 LTE PUSCH中, 其中 PUSCH导频结构如图 4所示, 有 3个终端设备 在 48个子载波(即前述的 "为 48)上进行传输, 在第一个时隙上为 1、 5、 9, 即 =1, nc 2 =5, nl =9, 这里的 g等于 12。
将 、 、 , 以及 g代入表达式(3 ) , 在本应用实例中接收机接收 到的导频信号 Γ (为前述参考信号的一种具体情形)为:
Y = Η^]2πηιηΧ + H2e ^5n2X + Η3ε]2π*9η2Χ + ΝΙ .
= Ηιειπ,6Χ + Η^]5π/6Χ + Η3ε]9πΙ6Χ + ΝΙ ,
根据表达式( 4 )对用户一进行处理,即根据用户一的已知发送序列 , 得到用户一的比例信号^:
Ηχλ + H2e] 2π'3 + H3e] ' 3 + ΝΪ;
a2 = nc 2 s
Figure imgf000019_0001
= 8 , 则 or = min(|orv|) = 4, A" =「 /min|or,.|]=3。 根据表达式(5-1 ) 、 表达式(5-2) 表达式(5-k) , 对用户一的 比例信号 中的子载波进行分组, 较佳地, 可以从以下两种分组方式中选取 一种:
分组一: {HL0HH2} . {Ηλ ΛΛΗΛ5) {H145H146H147} , 釆用该方式分组 所得到的组数 w = 16; 分组二:
Figure imgf000019_0002
{ ,4Α4<Λ47},釆用该方式分组 所得到的组数 w = 46;
根据表达式(6) ~ (9) , 得到用户一的信道响应 Q为:
Q1 = 3Haj + Na; 其中: Q=[Q,0 QU'"Q — J ;
N = [N;0N;]-N;;w_1f;
将得到的用户一的信道响应 Q和根据分组方式确定的组数v代入表达式 (10) , 获得用户一在子载波上的平均信号功率 Ρ 为: ps, =― y H, , 。 对用户二进行处理, 即根据用户二的已知发送序列 '12 ,得到用户二 的比例信号 :
H2 = H、e-j 4πΙ3 +H2+ HeJ 4π'3 + ΝΙ'
2=nc l s -nc 2 s=-A;
"3 =ni - =4
则:
= min(|«v|) = 4;
k = \ql min|ov| = 3。
利用表达式(5)进行分组, 较佳地, 可以从以下两种分组方式中选取一 种, 但是需要与用户一的分组方式相同:
分组一: {A2.。^^2}、 {H2,H2AH25} {ΗΗΗ2ΑΊ} , 采用该方式分 组所得到的组数 =16;
分组二: {^2,0 ^,^2,2}、 {Η21Η22Η23} {^2,45^2,46^2,47} ' 采用该方式分 组所得到的组数 W = 46;
根据表达式(6) ~ (9) , 得到用户二的信道响应 ¾为:
Q2 = 3Ha2 + Na; 其中: α = [¾0 Q2
Ηα2=[Η20Η2]2^]τ;
Figure imgf000020_0001
将得到的用户二的信道响应 ¾和根据分组方式确定的组数 ^代入表达式
( 10 二在子载波上的平均信号功率 ¾2为: 。
Figure imgf000021_0001
对用户三进行处理,才艮据用户三的已知发送序列 ,得到用户一的 比例信号
H3 = H、e-] M3 + H2e~J 4Π'3 +H3 + ΝΙ';
= - =- 4;
则:
a = min(|av|) = 4;
k = \ql min|ov| = 3。
根据表达式(5-1 ) 、 表达式(5-2) 表达式(5-k) , 对用户三的 比例信号^中的子载波进行分组, 较佳地, 可以从以下两种分组方式中选取 一种, 但是需要与用户一及用户二的分组方式相同:
分组一: { ΑΑ2}、 [Η ,Η,ΛΗ 5] { 4Α,4Α,47} , 釆用该方式分 组所得到的组数 =16; 分组二: 3,2}、
Figure imgf000021_0002
, 采用该方式分 组所得到的组数 w = 46;
根据表达式(6) ~ (9) , 得到用户三的信道响应 为:
Q3 = 3Ha3 + Na; 其中:
=[ r-Qw_ ;
Ha3 = [H Hi, '"H w-\i;
将得到的用户三的信道响应 ft和根据分组方式确定的组数 代入表达式
( 10) , 获得用户三在子载波上的平均信号功率 ¾为: w-\ ―
4w 3,
=0
根据表达式(11 ) , 获得子载波上的总平均功率 P为:
¾ W N
Figure imgf000022_0001
根据表达式(12) , 获得噪声平均功率 7W为:
PN = P—PSfPS2—PS
根据表达式(13) , 分别获得用户一的载波干扰噪声比 C/NR,、 用户
Figure imgf000022_0002
载波干扰噪声比 CINR^以及用户三的载波干扰噪声比 CINR为:
CINR, =
Figure imgf000022_0003
CINR, =
第四应用实例:
在 LTE Sounding参考信号中, 其中 Sounding参考信号(为前述参考信号 的一种具体情形)的结构如图 5所示, 有 2个终端设备在 48个子载波(即前 述的 w为 48)上进行传输, 在第一个时隙上为 0和 4, 即 =0, =4, 这 里的 等于 8。
将 、 , 以及 g代入表达式(3) , 即在本应用实例中接收机接收到得 Sounding参考信号 为:
γ = X + H2e] *4 X + NI .
Figure imgf000022_0004
根据表达式 (4 ) 对用户一进行处理, 即根据用户一的已知发送序列 ejl X, 得到用户一的比例信号^:
Figure imgf000022_0005
"2 = _ = 4
则: 根据表达式(5-1) 、 表达式(5-2) 表达式(5-k) , 对用户一的 比例信号 中的子载波进行分组, 较佳地, 可以从以下两种分组方式中选取 一种: 分组一: {^AU}、 {H H1 } {H,46H,47} ' 釆用该方式分组所得到的 组数 ¼' = 24;
分组二:
Figure imgf000023_0001
{« } {H,46H,,47} , 采用该方式分组所得到的 组数 w = 47;
根据表达式(6) ~ (9) , 得到用户一的信道响应 为:
Q] =2Hal+Na; 其中: Q - ^f;
Na = [N;0N;i-N;;w_1f;
将得到的用户一的信道响应 Q和根据分组方式确定的组数 ^代入表达式 (10) , 获得用户一在子载波上的平均信号功率 ^为:
对用户二进行处理, 即根据用户二的已知发送序列 4/8 , 得到用户二 的比例信号 :
Figure imgf000023_0002
r ^y2―†il —n2 ―—41: 5
Figure imgf000023_0003
利用表达式(5-1) 、 表达式(5-2) 表达式(5-k) , 对用户二的 比例信号^中的子载波进行分组, 较佳地, 可以从以下两种分组方式中选取 一种, 但是需要与用户一的分组方式相同: 分组一: {^,。 }、 {H^2H2,3} {^2,46^2,47} ' 采用该方式分组所得到 的组数 w = 24;
分组二: {Α2,。^ }、 {Η2β22} {^4(Λ,47}, 釆用该方式分组所得到 的组数¼' = 47;
根据表达式(6) ~ (9) , 得到用户二的信道响应 ft为:
, = Ηα2 + Να; 其中:
Q2=[Q 0 Q2 U ;
Ha2 = [H20 H2r"H2,w-i ;
Να = [Ν2'0Ν2'Λ2'^]τ;
将得到的用户二的信道响应 ρ2和根据分组方式确定的组数 w代入表达式 ( 10) , 获得用户二在子载波上的平均信号功率 ¾2为:
Figure imgf000024_0001
根据表达式(11 ) , 获得子载波上的总平均功率 P为:
1 2
P ∑ ; 根据表达式(12) , 获得噪声平均功率 7W为:
PN = P-PS,-PS2
根据表达式(13), 分别获得用户一的载波干扰噪声比 及用户二的 载波干扰噪声比 CINR^为:
CINR, =
PN
CINR, = ―
¾ PN
显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 或 者将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软 件结合。
虽然本发明所揭露的实施方式如上, 但所述的内容只是为了便于理解本 发明而釆用的实施方式, 并非用以限定本发明。 任何本发明所属技术领域内 的技术人员, 在不脱离本发明所揭露的精神和范围的前提下, 可以在实施的 形式上及细节上作任何的修改与变化, 但本发明的专利保护范围, 仍须以所 附的权利要求书所界定的范围为准。

Claims

权 利 要 求 书
1、 一种载波干扰噪声比的测量方法,应用于无线通信***,该方法包括: 接收参考信号;
根据每个用户的已知发送序列, 从所述参考信号中分别获得每个用户的 子载波信号平均功率;
根据所述***的子载波总平均功率及所述每个用户的子载波信号平均功 率, 获得子载波上干扰噪声平均功率; 以及
根据所述每个用户的子载波信号平均功率及所述子载波上干扰噪声平均 功率, 获得每个用户的载波干扰信噪比。
2、 如权利要求 1所述的方法,根据所述每个用户的已知发送序列分别获 得所述每个用户的子载波信号平均功率的步骤, 对于每个用户:
将所述参考信号除以所述用户的已知发送序列, 得到所述用户的比例信 号;
对所述比例信号中的子载波进行分组, 每组内的子载波数量均相等, 且 相邻两组内至少存在一个不相同的子载波;
将每组内的子载波累加, 得到所述用户的信道响应;
对所述用户的信道响应进行信道估计, 获得所述用户的信道冲击响应; 以及
根据所述用户的信道冲击响应, 获得所述用户的子载波信号平均功率。
3、 如权利要求 2所述的方法,对所述比例信号中的子载波进行分组的步 骤, 包括:
根据***的最大用户数以及每个用户的循环偏移, 确定所述每组内的子 载波数量。
4、 如权利要求 3所述的方法,根据所述***的最大用户数以及每个用户 的循环偏移确定所述每组内的子载波数量的步骤, 对于用户 包括根据下 式确定所述每组内的子载波数量: 其中:
k为所述每组内的子载波数量;
αν =η _η=, VG[1,U] , 为***中的用户总数;
为用户 的循环偏移;
为用户 V的循环偏移, e[0,?-l], g为所述***的最大用户数; 以及
"Π"为取整运算符。
5、 如权利要求 2所述的方法, 其中:
对所述比例信号中的子载波进行分组,相邻两组内不存在相同的子载波, 或者仅存在一个不相同的子载波。
6、 如权利要求 2所述的方法,对所述用户的信道响应进行信道估计获得 所述用户的信道冲击响应的步骤, 包括:
对所述用户的信道响应进行最小平方信道估计, 获得所述用户的信道冲 击响应。
7、 如权利要求 2所述的方法,根据所述用户的信道冲击响应获得所述用 户的子载波信号平均功率的步骤, 对于用户 m , 包括才艮据下式获得所述子载 波信号平均功率:
w-\■ ι 其中:
¾m为所述用户 的子载波信号平均功率;
k为所述每组内的子载波数量;
W为对所述比例信号中的子载波进行分组得到的组数;
Hm j为所述用户 m的信道冲击响应。
8、 如权利要求 7所述的方法, 其中: 对所述比例信号中的子载波进行分组得到的所述组数 ^ , 根据所述比例 信号中的子载波总数、 所述每组内的子载波数量 A以及相邻两组内不相同的 子载波数确定。
9、 一种载波干扰噪声比的测量装置,应用于无线通信***,该装置包括 预处理模块、 分组模块、 用户分离模块、 信道估计模块、 功率计算模块以及 载波干扰信噪比计算模块, 其中:
所述预处理模块, 设置为接收参考信号, 并将所述参考信号除以用户的 已知发送序列, 得到所述用户的比例信号;
所述分组模块, 设置为对所述比例信号中的子载波进行分组, 每组内的 子载波数量均相等, 且相邻两组内至少存在一个不相同的子载波;
所述用户分离模块, 设置为将每组内的子载波累加, 得到所述用户的信 道响应;
所述信道估计模块, 设置为对所述用户的信道响应进行信道估计, 获得 所述用户的信道冲击响应;
所述功率计算模块, 设置为根据所述用户的信道冲击响应, 获得所述用 户的子载波信号平均功率, 并根据每个用户的子载波信号平均功率及所述系 统的子载波总平均功率获得子载波上干扰噪声平均功率; 以及
所述载波干扰信噪比计算模块, 设置为根据所述每个用户的子载波信号 平均功率及所述子载波上干扰噪声平均功率, 获得每个用户的载波干扰信噪 比。
10、 如权利要求 9所述的装置, 其中:
所述分组模块设置为根据所述***的最大用户数以及每个用户的循环偏 移, 确定所述每组内的子载波数量。
1 1、 如权利要求 10所述的装置, 其中:
所述分组模块设置为对于用户 , 包括根据下式确定所述每组内的子载 波数量:
k = \ql min| v |; 其中:
k为所述每组内的子载波数量;
αν=η →:, VG[1,U] , 为所述***的用户总数;
为用户 的循环偏移;
为用户 V的循环偏移, e[0,g- 1], g为所述最大用户数; 以及
"Π"为取整运算符。
12、 如权利要求 9所述的装置, 其中:
所述分组模块设置为对所述比例信号中的子载波进行分组, 相邻两组内 不存在相同的子载波, 或者仅存在一个不相同的子载波。
13、 如权利要求 9所述的装置, 其中:
所述信道估计模块设置为对所述用户的信道响应进行最小平方信道估 计, 获得所述用户的信道冲击响应。
14、 如权利要求 9所述的装置, 其中:
所述功率计算模块设置为对于用户 m , 包括根据下式获得所述子载波信 号平均功率: k w J=0 I ' 其中:
¾m为所述用户 的子载波信号平均功率;
k为所述每组内的子载波数量;
^为所述分组模块对所述比例信号中的子载波进行分组得到的组数; 以 及
Hm j为所述用户 m的信道冲击响应。
15、 如权利要求 14所述的装置, 其中:
所述分组模块根据所述比例信号中的子载波总数、 所述每组内的子载波 数量 A以及相邻两组内不相同的子载波数, 确定对所述比例信号中的子载波 进行分组时的所述组数 W。
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CN105517169B (zh) * 2014-09-26 2019-05-17 成都鼎桥通信技术有限公司 一种用于规避干扰的调度方法
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CN110868716B (zh) * 2019-11-22 2023-09-15 国网河南省电力公司电力科学研究院 一种基于连续子载波分组的物理层安全传输方法
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