CN109547067A - A kind of channel detection method suitable for power carrier communication system - Google Patents
A kind of channel detection method suitable for power carrier communication system Download PDFInfo
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- CN109547067A CN109547067A CN201811407080.7A CN201811407080A CN109547067A CN 109547067 A CN109547067 A CN 109547067A CN 201811407080 A CN201811407080 A CN 201811407080A CN 109547067 A CN109547067 A CN 109547067A
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- channel detection
- channel
- training sequence
- communication system
- power carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
Abstract
The invention discloses a kind of channel detection methods suitable for power carrier communication system, a multiphase sequence is generated first as training sequence, then the mathematical modeling of the Channel Detection based on training sequence is constructed, and then a quadratic programming problem is converted by the Channel Detection problem in power carrier communication system, the optimization problem is solved further according to Karush-Kuhn-Tucker (KKT) complementarity condition.The training sequence that the method for the present invention requires nothing more than small data quantity can directly obtain balanced device, be a kind of direct channel detection method, the requirement of real time that power carrier communication system time varying channel updates when can effectively meet.
Description
Technical field
The present invention relates to electric power carrier communication technology field, in particular to a kind of letter suitable for power carrier communication system
Road detection method.
Background technique
Power line carrier, PLC (PLC) is the distinctive communication mode of electric system, refers to using existing power line, passes through carrier wave
Analog or digital signal is carried out the technology of high-speed transfer by mode, its biggest characteristic is that not needing to set up network again, as long as having
Electric wire just can be carried out data transmitting.Power line carrier, PLC has obtained universal application in intelligent distribution network at present, such as copies automatically
Table, advanced measurement basis framework, automobile electrical network communication, smart home system, building system and intelligent transportation system.Power carrier
Often with there is frequency selective fading (Frequency Selective Fading, abbreviation FSF), FSF refers to the channel of communication
The main reason for certain Frequency points, the frequency response curve of channel occurs very deep recess suddenly, causes FSF has: one, signal exists
Series resonance occurs on certain Frequency points；Two, the multipath transmisstion of signal.Therefore signal is in power line carrier communication channel
When can occur be distorted and distort.
In order to realize correctly decision signal, the shadow to signal of channel must be farthest offset in signal receiving end
It rings, i.e., to signal progress equilibrium is received, required channel state information needs to obtain by Channel Detection in balancing procedure,
Therefore channel detection method determines the efficiency of signal transmission.Channel detection method based on training sequence is current engineering field
A kind of common channel detection method, but traditional channel detection method based on training sequence need first to obtain channel it is abnormal
Become, finally obtains balanced device then in conjunction with the concrete form of transmitting filter, implement more complicated.
Summary of the invention
The technical problem to be solved in the present invention is to provide it is a kind of realize it is convenient and better performances logical suitable for power carrier
The channel detection method of letter system.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions: one kind being suitable for power carrier
The channel detection method of communication system, comprising the following steps:
Step 1, generating length is the FZC type multiphase sequence of n as training sequence:
Wherein, Q and G is coprime positive integer, and n is natural number, and e is natural constant, and j is imaginary unit, and π is pi；
Step 2, if s (k) is the information data of transmitting, the reception that s (k) is obtained after being polluted by channel by white Gaussian noise
Signal is x (k), and x (k) is indicated are as follows:
Wherein, c (k) be the period be P training sequence, h (k) be channel finite impulse response (FIR), n (k) be Gauss white noise
Sound, channel length F, F≤P；
If y (j)=E [x (iP+j)], j=0,1 ..., P-1 (3)
Wherein, ()PDefine arithmetic module P operation；Expectation is asked in E [] expression；
If s (k) is FZC sequence, N number of data sample T=(x is obtained1,d1),(x2,d2),…(xl,dl), wherein receiving letter
Number xi=(xi,xi-1,…,xi-M+1)T, M is equalizer length, diFor desired signal, i=1 ..., N；
wTxi=yi=di, i=1 ..., N, wherein w is equalizer tap coefficient vector, and subscript T indicates transposition operation；
Step 3, formula (4) is turned into matrix form,
Y=Ch (5)
Show that C is made of the last M column of the circular matrix of training sequence c (k)；
Enable Np=N/P is integer, obtains Channel Detection are as follows:
Wherein subscript -1 indicates inversion operation；
Step 4, the channel detection method of power carrier communication system is converted to the optimization problem of convex quadratic programming problem:
Wherein, RlIndicate that dimension is the real number domain space of l,A andRespectively by αi,I=1 ..., l composition
Column vector,K is by element K (xi,xj) composition Gram matrix,Its
Middle d=(d1,…,dl)T；ε is the lesser constant of a value, can use ε=0.05 in the present invention, and 1 indicates that its element is all 1 matrix
Vector；
Step 5, according to Karush-Kuhn-Tucker (KKT) complementarity condition, optimization problem in solution procedure 4 is obtained
Optimal solutionBalanced device indicates are as follows:
Wherein, w*Expression solves the corresponding estimated value of w after optimization problem.
The beneficial effects of the invention are as follows can directly obtain balanced device, rather than it is similar with traditional based on training sequence
Estimation method first obtains channel distortions, finally obtains balanced device then in conjunction with the concrete form of transmitting filter.
Detailed description of the invention
Fig. 1 is communication link discrete model of the present embodiment based on training sequence；
Fig. 2 is the convolution results of the present embodiment real channel and balanced device；
Fig. 3 is the relationship of the present embodiment training sequence length and equalizer performance；
Fig. 4 is the relationship of the present embodiment signal-to-noise ratio and equalizer performance.
Specific embodiment
In order to which technical solution of the present invention is more clearly understood, with reference to the accompanying drawings and embodiments, to the present invention make into
One step is described in detail.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit this hair
It is bright.
The present invention provides a kind of channel detection method suitable for power carrier communication system, comprising the following steps:
Step 1, generating length is the FZC type multiphase sequence of n as training sequence:
Wherein, Q and G is coprime positive integer, and n is natural number, and e is natural constant, and j is imaginary unit, and π is pi；
Step 2, if s (k) is the information data of transmitting, the reception that s (k) is obtained after being polluted by channel by white Gaussian noise
Signal is x (k), and x (k) is indicated are as follows:
Wherein, c (k) be the period be P training sequence, h (k) be channel finite impulse response (FIR), n (k) be Gauss white noise
Sound, channel length F, F≤P；
If y (j)=E [x (iP+j)], j=0,1 ..., P-1 (3)
Wherein, ()PDefine arithmetic module P operation；Expectation is asked in E [] expression；
If s (k) is FZC sequence, N number of data sample T=(x is obtained1,d1),(x2,d2),…(xl,dl), wherein receiving letter
Number xi=(xi,xi-1,…,xi-M+1)T, M is equalizer length, diFor desired signal, i=1 ..., N；
wTxi=yi=di, i=1 ..., N, wherein w is equalizer tap coefficient vector, and subscript T indicates transposition operation；
Step 3, formula (4) is turned into matrix form,
Y=Ch (5)
Show that C is made of the last M column of the circular matrix of training sequence c (k)；
Enable Np=N/P is integer, obtains Channel Detection are as follows:
Wherein subscript -1 indicates inversion operation；
Step 4, the channel detection method of power carrier communication system is converted to the optimization problem of convex quadratic programming problem:
Wherein, RlIndicate that dimension is the real number domain space of l,A andRespectively by αi,I=1 ..., l
The column vector of composition,K is by element K (xi,xj) composition Gram matrix,
Wherein d=(d1,…,dl)T；ε is the lesser constant of a value, can use ε=0.05 in the present invention, and 1 indicates that its element is all 1 square
Battle array vector；
Step 5, according to Karush-Kuhn-Tucker (KKT) complementarity condition, optimization problem in solution procedure 4 is obtained
Optimal solutionBalanced device indicates are as follows:
Wherein, w*Expression solves the corresponding estimated value of w after optimization problem.
The illustration present invention, experiment condition are as follows below:
C=20；
ε=0.05；
Experiment number is 50；
Equalizer tap number is 25；
Training sequence uses FZC- sequence；
Channel 1:h1=-0.221+-0.199z-1+z-2+-0.284z-3+0.136z-4；Z herein-1Indicate 1 time of delay
Unit, z-2Indicate 2 time quantums of delay, z-3Indicate 3 time quantums of delay, z-4Indicate 4 time quantums of delay.
(1) in the case where training sequence length is 50, signal is sent by giving signal-to-noise ratio in channel h1, Fig. 2
The convolution results of real channel and balanced device in the case of 20dB.
(2) when Signal to Noise Ratio (SNR)=20dB, in the case that training sequence length is respectively N=25k, k=1 ..., 8, believing
Road is h1, and Fig. 3 gives the relationship of training sequence length and equalizer performance.
(3) when Signal to Noise Ratio (SNR)=0~50dB, in the case of training sequence length is 25,50,75,100,150,200, Fig. 4
Give the relationship of signal-to-noise ratio and equalizer performance.
Estimated using (ISI) is interfered as performance indicator between the output symbol of balanced device, is defined as:
Wherein, h is true channel, and w is the balanced device estimated,For convolution operator,It is equal for combined channel
The impulse response of weighing apparatus, log are exponential function, and max expression takes maximum.
It can be concluded that method provided by the invention can fast and effectively estimate carrier wave system from Fig. 1 to Fig. 4
Channel.
Above embodiments are only explanation of the invention, are not limitation of the present invention, for the general of this field
For logical technical staff, without departing from the principle of the present invention, various modifications and improvements can be made, these are belonged to
Protection scope of the present invention, therefore the scope of protection of the patent of the present invention should be subject to the claims.
Claims (1)
1. a kind of channel detection method suitable for power carrier communication system, it is characterised in that the following steps are included:
Step 1, generating length is the FZC type multiphase sequence of n as training sequence:
Wherein, Q and G is coprime positive integer, and n is natural number, and e is natural constant, and j is imaginary unit, and π is pi；
Step 2, if s (k) is the information data of transmitting, the reception signal that s (k) is obtained after being polluted by channel by white Gaussian noise
For x (k), x (k) is indicated are as follows:
Wherein, c (k) be the period be P training sequence, h (k) be channel finite impulse response (FIR), n (k) be white Gaussian noise, letter
Road length is F, F≤P；
If y (j)=E [x (iP+j)], j=0,1 ..., P-1 (3)
Wherein, ()PDefine arithmetic module P operation；Expectation is asked in E [] expression；
If s (k) is FZC sequence, N number of data sample T=(x is obtained1,d1),(x2,d2),…(xl,dl), wherein receiving signal xi=
(xi,xi-1,…,xi-M+1)T, M is equalizer length, diFor desired signal, i=1 ..., N；
wTxi=yi=di, i=1 ..., N, wherein w is equalizer tap coefficient vector, and subscript T indicates transposition operation；
Step 3, formula (4) is turned into matrix form,
Y=Ch (5)
Show that C is made of the last M column of the circular matrix of training sequence c (k)；
Enable Np=N/P is integer, obtains Channel Detection are as follows:
Wherein subscript -1 indicates inversion operation；
Step 4, the channel detection method of power carrier communication system is converted to the optimization problem of convex quadratic programming problem:
Wherein, RlIndicate that dimension is the real number domain space of l,A andRespectively by αi,Composition
Column vector,K is by element K (xi,xj) composition Gram matrix,Wherein
D=(d1,…,dl)T；ε is the lesser constant of a value, can use ε=0.05 in the present invention, 1 expression its element be all 1 matrix to
Amount；
Step 5, according to Karush-Kuhn-Tucker (KKT) complementarity condition, optimization problem in solution procedure 4 is obtained optimal
SolutionBalanced device indicates are as follows:
Wherein, w*Expression solves the corresponding estimated value of w after optimization problem.
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Cited By (1)
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| CN110661549A (en) * | 2019-11-11 | 2020-01-07 | 广东石油化工学院 | PLC signal reconstruction method and system by utilizing dictionary atoms |
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Application publication date: 20190329 |