CN102223343A - Method for multiplexing fractional domain resources in communication system of mixed carrier system - Google Patents

Abstract

The invention discloses a method for multiplexing fractional domain resources in a communication system of a mixed carrier system and relates to the field of communication. By the method, the problems of poorer time-varying resistance and higher peak-to-average power ratio of the conventional multiplexing and multiple access method are solved. The method comprises the following processes of: signal transmission, in which user address selection is respectively carried out on data which is input by each user in m users, weighted fractional Fourier transformation and system parameter selection are carried out respectively, and a signal is transmitted to a channel; and signal receiving, in which a receiving end carries out weighted fractional Fourier transformation and system parameter selection on the received signal and then outputs the signal. The method for multiplexing the fractional domain resources in the communication system of the mixed carrier system is applicable to the communication system of the mixed carrier system.

Description

Mixed carrier system communication system mid-score territory resource multiplexing method

Technical field

The present invention relates to the communications field.

Background technology

Weighting class fractional Fourier transform (WFRFT) has obtained preliminary application in communication system, and have the feature of single and multi-carrier system hybrid modulation based on the digital communication system of weighting class fractional Fourier transform, be a kind of hybrid system structure that can change the carrier wave system as required.Distribute compare single carrier or multicarrier of its bit energy on whole time-frequency plane is more even, symmetrical, and this makes the mixed carrier system communication system based on WFRFT have more stable systematic function in dissimilar time-frequency Selective Fading Channel.And, then can provide consistent relatively resource, and then realize the fairness between the user for different user based on the weighted score territory multiple access access scheme of this system.In dissimilar time-frequency Selective Fading Channel, this multiple access access scheme compare traditional time division multiple access or frequency division multiple access scheme can utilize resource more fully, and then insert when realizing more users.But existing multiplexing and anti-time variation multiple access method is relatively poor, peak-to-average power ratio is higher.

Summary of the invention

The present invention is in order to solve existing multiplexing and relatively poor, the peak-to-average power ratio problem of higher of anti-time variation multiple access method, thereby mixed carrier system communication system mid-score territory resource multiplexing method is provided.

Mixed carrier system communication system mid-score territory resource multiplexing method, it is the method that the weighted score territory is multiplexing and the multiple access access is united in the mixed carrier system communication system, it is realized by following steps:

The signal emission process:

Steps A 1, the data of the input of each user among m the user are carried out station address respectively select, the selective system parameter is weighted fractional Fourier transform to data then, and each user among m user obtains the N road signal after the conversion;

The N road signal of each user among steps A 2, m the user that steps A 1 is obtained carries out signal and sends the processing in early stage, and is sent to channel;

The signal receiving course:

Step B1, receiving terminal receive post-processed with the signal that receives;

Signal after step B2, selective system parameter are handled step B1 is weighted fractional Fourier transform, obtain the N circuit-switched data after each the user's conversion among m the user, the N circuit-switched data after each the user's conversion among m user is carried out station address respectively and is selected back output;

M and N are positive integer.

Signal sends the method for handling early stage and may further comprise the steps:

Step C1, the N road signal that obtains of each user among m the user is sent signal processing behind weight score Fourier conversion, the N road signal after each user among m user obtains to handle, described transmission signal processing is for adding Cyclic Prefix;

Signal after step C2, the processing that step C1 is obtained carries out the D/A conversion;

Signal after step C3, the conversion that step C2 is obtained carries out upconversion process, finishes signal and sends and handle early stage.

The method that signal receives post-processed may further comprise the steps:

Step D1, the signal that receives is carried out down-converted;

Signal after step D2, the processing that step D1 is obtained carries out the A/D conversion;

Signal after step D3, the conversion that step D2 is obtained carries out received signal to be handled, and the N road signal after each user among m user obtains to handle is finished signal reception post-processed; Described received signal is treated to the removal Cyclic Prefix.

Mixed carrier system communication system mid-score territory resource multiplexing method, it is the weighted score territory multiplexing method in the mixed carrier system communication system, it is realized by following steps:

The signal emission process:

Step e 1, a m user's input data are merged into the sequence of complex numbers that one tunnel length is N by the signal multiplexing module;

Step e 2, adopt the method for dynamic parameter selection to obtain system parameters, the road length that step e 1 is obtained is that the sequence of complex numbers of N is weighted fractional Fourier transform, obtains the signal after the conversion; Described system parameters is α, MV, NV;

Signal after step e 3, the conversion that step e 2 is obtained sends to be handled early stage;

Signal after step e 4, the processing that step e 3 is obtained carries out the D/A conversion;

Signal after step e 5, the conversion that step e 4 is obtained carries out upconversion process, and is emitted to channel;

The signal receiving course:

Step F 1, the signal that receives is carried out down-converted;

Signal after step F 2, the processing that step F 1 is obtained carries out the A/D conversion;

Signal after step F 3, the conversion that step F 2 is obtained carries out received signal to be handled;

The method of step F 4, employing dynamic parameter selection obtains system parameters, and the signal after the processing of step F 3 acquisitions is weighted fractional Fourier transform, the signal after the acquisition conversion; Described system parameters is-α, MV, NV;

Signal after step F 5, the conversion that step F 4 is obtained separates by separation module, obtains m user's dateout.

Mixed carrier system communication system mid-score territory resource multiplexing method, the weighted score territory multiple access method in the mixed carrier system communication system, it is realized by following steps:

The signal emission process:

Step G1, the data of user input are carried out station address respectively select, adopt the method for dynamic parameter selection to obtain system parameters, the N group data that obtain station address are weighted fractional Fourier transform respectively, obtain the N road signal after the conversion;

N road signal after step G2, the conversion that step G1 is obtained sends signal processing;

Signal after step G3, the processing that step G2 is obtained carries out the D/A conversion;

Signal after step G4, the conversion that step G3 is obtained carries out the up-conversion rate to be handled, and is sent to channel;

The signal receiving course:

Step H1, the signal that receives is carried out down-converted;

Signal after step H2, the processing that step H1 is obtained carries out the A/D conversion;

Signal after step H3, the conversion that step H2 is obtained carries out received signal to be handled;

The method of step H4, usefulness dynamic parameter selection obtains system parameters, and the signal after the processing that obtains among the step H3 is weighted fractional Fourier transform respectively, the signal after the acquisition N road conversion;

Signal after step H5, the N road conversion that step H4 is obtained carries out station address and extracts, and obtains user's N group data.

Beneficial effect: the present invention adopts the multiplexing and multiple access method in weighted score territory in mixed carrier system communication system, the anti-time variation of system is good, and peak-to-average power ratio is low.

Description of drawings

Fig. 1 is the signal processing flow schematic diagram of the multiplexing and multiple access method in embodiment one described a kind of weighted score of the present invention territory; Fig. 2 is the signal processing flow schematic diagram of the signal emission process neutralisation signals method of reseptance of weighted score of the present invention territory multiplexing method; Fig. 3 is the signal processing flow schematic diagram of the signal emission process neutralisation signals method of reseptance of multiple access method of the present invention; Fig. 4 is the enforcement structure and the physical meaning schematic diagram thereof of weight score Fourier conversion; Fig. 5 is the user profile Energy distribution schematic diagram of time-division multiple address system; Fig. 6 is the user profile Energy distribution schematic diagram of fdma system; Fig. 7 is the user profile Energy distribution schematic diagram of weighted score territory multi-address system.

Embodiment

Embodiment one, this embodiment is described in conjunction with Fig. 1, mixed carrier system communication system mid-score territory resource multiplexing method, it is the method that the weighted score territory is multiplexing and the multiple access access is united in the mixed carrier system communication system, and it is realized by following steps:

The signal emission process:

Steps A 1, the data of the input of each user among m the user are carried out station address respectively select, the selective system parameter is weighted fractional Fourier transform to data then, and each user among m user obtains the N road signal after the conversion;

The N road signal of each user among steps A 2, m the user that steps A 1 is obtained carries out signal and sends the processing in early stage, and is sent to channel;

The signal receiving course:

Step B1, receiving terminal receive post-processed with the signal that receives;

Signal after step B2, selective system parameter are handled step B1 is weighted fractional Fourier transform, obtain the N circuit-switched data after each the user's conversion among m the user, the N circuit-switched data after each the user's conversion among m user is carried out station address respectively and is selected back output;

M and N are positive integer.

Signal sends the method for handling early stage and may further comprise the steps:

Step C1, the N road signal that obtains of each user among m the user is sent signal processing behind weight score Fourier conversion, the N road signal after each user among m user obtains to handle, described transmission signal processing is for adding Cyclic Prefix;

Signal after step C2, the processing that step C1 is obtained carries out the D/A conversion;

Signal after step C3, the conversion that step C2 is obtained carries out upconversion process, finishes signal and sends and handle early stage.

The method that signal receives post-processed may further comprise the steps:

Step D1, the signal that receives is carried out down-converted;

Signal after step D2, the processing that step D1 is obtained carries out the A/D conversion;

Signal after step D3, the conversion that step D2 is obtained carries out received signal to be handled, and the N road signal after each user among m user obtains to handle is finished signal reception post-processed; Described received signal is treated to the removal Cyclic Prefix.

Embodiment two, this embodiment is described in conjunction with Fig. 2, mixed carrier system communication system mid-score territory resource multiplexing method, it is the weighted score territory multiplexing method in the mixed carrier system communication system, it is realized by following steps:

The signal emission process:

Step e 1, a m user's input data are merged into the sequence of complex numbers that one tunnel length is N by the signal multiplexing module;

Step e 2, adopt the method for dynamic parameter selection to obtain system parameters, the road length that step e 1 is obtained is that the sequence of complex numbers of N is weighted fractional Fourier transform, obtains the signal after the conversion; Described system parameters is α, MV, NV;

Signal after step e 3, the conversion that step e 2 is obtained sends to be handled early stage;

Signal after step e 4, the processing that step e 3 is obtained carries out the D/A conversion;

Signal after step e 5, the conversion that step e 4 is obtained carries out upconversion process, and is emitted to channel;

The signal receiving course:

Step F 1, the signal that receives is carried out down-converted;

Signal after step F 2, the processing that step F 1 is obtained carries out the A/D conversion;

Signal after step F 3, the conversion that step F 2 is obtained carries out received signal to be handled;

The method of step F 4, employing dynamic parameter selection obtains system parameters, and the signal after the processing of step F 3 acquisitions is weighted fractional Fourier transform, the signal after the acquisition conversion; Described system parameters is-α, MV, NV;

Signal after step F 5, the conversion that step F 4 is obtained separates by separation module, obtains m user's dateout.

Embodiment three, this embodiment is described in conjunction with Fig. 3, mixed carrier system communication system mid-score territory resource multiplexing method, it is the weighted score territory multiple access method in the mixed carrier system communication system, it is realized by following steps:

The signal emission process:

The signal emission process:

Step G1, the data of user input are carried out station address respectively select, adopt the method for dynamic parameter selection to obtain system parameters, the N group data that obtain station address are weighted fractional Fourier transform respectively, obtain the N road signal after the conversion;

N road signal after step G2, the conversion that step G1 is obtained sends signal processing;

Signal after step G3, the processing that step G2 is obtained carries out the D/A conversion;

Signal after step G4, the conversion that step G3 is obtained carries out the up-conversion rate to be handled, and is sent to channel;

The signal receiving course:

Step H1, the signal that receives is carried out down-converted;

Signal after step H2, the processing that step H1 is obtained carries out the A/D conversion;

Signal after step H3, the conversion that step H2 is obtained carries out received signal to be handled;

The method of step H4, usefulness dynamic parameter selection obtains system parameters, and the signal after the processing that obtains among the step H3 is weighted fractional Fourier transform respectively, the signal after the acquisition N road conversion;

Signal after step H5, the N road conversion that step H4 is obtained carries out station address and extracts, and obtains user's N group data.

Embodiment four: it is a kind of in the embodiment one to three that present embodiment adopts technical scheme, described execution mode one to three based on principle identical, be specially: the present invention is the orthogonal division on the weighted score territory, there is not the problem of multi-user interference in the CDMA scheme of comparing in the technical scheme of the present invention.

If X ₀(n) be any sequence of complex numbers, { X ₀(n), X ₁(n), X ₂(n), X ₃(n) } be X respectively ₀(n) 0～3 discrete Fourier transform (DFT) wherein DFT adopts normalization definition form, as the formula (1)

$\left\{\begin{array}{c}X\left(k\right)=\frac{1}{\sqrt{N}}\underset{n=0}{\overset{N-1}{\mathrm{\Σ}}}x\left(n\right)e^{-j\frac{2\mathrm{\π}}{N}\mathrm{kn}}\\ x\left(n\right)=\frac{1}{\sqrt{N}}\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}X\left(k\right)e^{j\frac{2\mathrm{\π}}{N}\mathrm{kn}}\end{array}\right.---\left(1\right)$

Then its WFRFT definition can be expressed as:

S ₀＝w ₀(α，V)X ₀(n)+w ₁(α，V)X ₁(n)+w ₂(α，V)X ₂(n)+w ₃(α，V)X ₃(n) (2)

Wherein, weight coefficient is defined as:

$w_l\left(\mathrm{\α}\right)=\frac{1}{4}\underset{k=0}{\overset{3}{\mathrm{\Σ}}}\exp \{\±\frac{2\mathrm{\πi}}{4}[(4m_k+1)\mathrm{\α}(k+4n_k)-\mathrm{lk}\left]\right\},l=\mathrm{0,1,2,3}---\left(3\right)$

Formula (3) is by α, MV=[m ₀, m ₁, m ₂, m ₃] and NV=[n ₀, n ₁, n ₂, n ₃] wait the common weight coefficient form of controlling of 9 parameters, wherein MV and NV are real vector.Definition V=[MV, NV], formula when V=0 (2) is defined to be one-parameter WFRFT, otherwise is multi-parameter WFRFT.

The definition of extends equation (2):

$S=\left[\begin{array}{c}{S}_0\\ S_1\\ S_2\\ S_3\end{array}\right]=\left[\begin{array}{cccc}{w}_0& w_1& w_2& w_3\\ w_3& w_0& w_1& w_2\\ w_2& w_3& w_0& w_1\\ w_1& w_2& w_3& w_0\end{array}\right]\left[\begin{array}{c}{X}_0\\ X_1\\ X_2\\ X_3\end{array}\right]=\left[\begin{array}{c}{w}_0{\mathrm{<figure-callout\; id="0"\; label="X"\; filenames="HDA0000075798990000011.png,HDA0000075798990000021.png"\; state="\{\{state\}\}">X</figure-callout>}}_0+w_1{X}_1+w_2{X}_2+w_3{X}_3\\ w_3{\mathrm{<figure-callout\; id="0"\; label="X"\; filenames="HDA0000075798990000011.png,HDA0000075798990000021.png"\; state="\{\{state\}\}">X</figure-callout>}}_0+w_0{X}_1+w_1{X}_2+w_2{X}_3\\ w_2{\mathrm{<figure-callout\; id="0"\; label="X"\; filenames="HDA0000075798990000011.png,HDA0000075798990000021.png"\; state="\{\{state\}\}">X</figure-callout>}}_0+w_3{X}_1+w_0{X}_2+w_1{X}_3\\ w_1{\mathrm{<figure-callout\; id="0"\; label="X"\; filenames="HDA0000075798990000011.png,HDA0000075798990000021.png"\; state="\{\{state\}\}">X</figure-callout>}}_0+w_2{X}_1+w_3{X}_2+w_0{X}_3\end{array}\right]---\left(4\right)$

By { X ₀(n), X ₁(n), X ₂(n), X ₃(n) } relation between it be easy to show that: { S ₀(n), S ₁(n), S ₂(n), S ₃(n) } be S respectively ₀(n) 0～3 DFT, S ₀(n) be S ₃(n) DFT; { S ₀(n), S ₁(n), S ₂(n), S ₃(n) } be respectively { X ₀(n), X ₁(n), X ₂(n), X ₃(n) } α rank WFRFT.Because reversible existence is at known S ₀(n) under the situation, can try to achieve X for the WFRFT of-α by it being done exponent number ₀(n).

X ₀(n)＝w ₀(-α，V)S ₀(n)+w ₁(-α，V)S ₁(n)+w ₂(-α，V)S ₂(n)+w ₃(-α，V)S ₃(n) (5)

To shown in Figure 7, be respectively time division multiple access, frequency division multiple access and weighted score territory each user's of multi-address system the distribution situation of information energy on time-frequency plane as Fig. 5.For time division multiple access, transmit specific user's information energy in each time slot, and all users' information energy is distributed in all within the same bandwidth.Fdma system is just corresponding with it, and the user-specific information energy transmits in independent frequency sub-band, and all users' information energy all was distributed in same period.From the time-frequency distributions of user profile energy, time-division multiple address system and fdma system are antithesis, the branch which is better and which is worse on the structure.The difference of the two performance in varying environment depends primarily on the influence that channel distributes for information energy.If under two dispersive channel environment, the influence that the form of these two kinds of Energy distribution is subjected to is quite similar.More satisfactory Energy distribution situation should be as the weighted score territory multiple access in the WFRFT system, even, symmetrical being distributed on the whole time-frequency plane of will trying one's best of each user's information energy.

Variance has and the corresponding physical significance of energy as second-order statistic, can come the distribution situation of comparison information energy on time-frequency plane by the variance of research sequence time-frequency domain.If X (n) (n=0,1 ..., 127) and be that a length is 128 information sequence, and first element of sequence X (0)=128, other elements are 0; The one-parameter WFRFT that X (n) is carried out α=0.5 obtains sequence S (n).Be easy to obtain the variance of time-domain signal X (n) on time-frequency domain by simple calculating and be respectively 128 and 0, and the variance of score field signal S (n) on time-frequency domain is respectively 64 and 64; Variance on X (n) frequency domain is 0, and it is very even to illustrate that the energy of X (n) distributes on frequency domain, yet its time-frequency domain variance differs huge, and its Energy distribution on time-frequency domain symmetry inadequately has been described.Corresponding with it is signal S (n) is though be 64 in the frequency domain upside deviation, and time-frequency domain equates, illustrate that WFRFT can be so that the distribution of information bit energy on time-frequency domain be symmetrical more.

The enforcement structure of weight score Fourier conversion and physical meaning thereof be as shown in Figure 4: the input of N point parallel data, and respectively through 4 branch roads: branch road 0 and branch road 2 do not pass through discrete Fourier transform (DFT), are considered as the single carrier component; Branch road 1 and branch road 3 are considered as the multicarrier component through discrete Fourier transform (DFT).The output of counter-rotating module is that input the 1st of data is remained unchanged, and puts the cart before the horse to the N dot sequency in the 2nd o'clock.Article 4, the data of branch road are respectively through phase adduction output after the coefficient weighting of branch road separately.

A plurality of user of the present invention shares this system simultaneously, and each user comes to distinguish mutually with other users by different address codes, and this point mainly is to select to realize by the station address shown in Fig. 3.Because in the weighted score territory, many subchannel are arranged, each user is in the enterprising line data transmission of own corresponding subchannel, embodiment on user code is: when each user is transmitted, all with data load to the subchannel of distributing to oneself, zero setting on other subchannel simultaneously, and then carry out WFRFT, send into channel and transmit.Corresponding with it, at receiving terminal, all data that the user at first will receive are carried out WFRFT, transform in the weighted score territory, give on the subchannel of oneself from system assignment then data are taken out, and send into the next stage circuit and are further processed.

The function of the Multiplexing module among the present invention is the form that user data waiting for transmission is integrated into the desired Frame of system, be about to the synthetic sequence of complex numbers (N is the length of a frame signal) that length is N of data set, and with its input signal as WFRFT, send in the symbol period at one, different code elements is loaded on the subchannels different in the weighted score territory to be transmitted, thereby realizes high-speed data transmission; The function of separation module is just in time opposite, and it reverts to original form with the N point sequence of complex numbers of WFRFT output, promptly on each subchannel from the selected weighting territory of transmitting terminal with the data taking-up, pass to the next stage system according to the identical rule of transmitting terminal again.

Simultaneously, the subchannel form in the weighted score territory can be used for carrying out multi-user's multiple access access.In the mixed carrier system communication system to the weighted score territory multiple access scheme of unique user as shown in Figure 3.Wherein, the function that station address is selected is that a certain user's data system of being assigned to is assigned on the subchannel in this user's the weighted score territory, and other are not assigned on this user's the sub-channel positions put 0, and then carries out WFRFT.The function that station address extracts is just opposite with the function that station address is selected, and the strategy that specific strategy is selected on station address is decided.

Claims (5)

1. mixed carrier system communication system mid-score territory resource multiplexing method is characterized in that: it is the method that the multiplexing and multiple access in weighted score territory inserts associating in the mixed carrier system communication system, and it is realized by following steps:

The signal emission process:

Steps A 1, the data of the input of each user among m the user are carried out station address respectively select, the selective system parameter is weighted fractional Fourier transform to data then, and each user among m user obtains the N road signal after the conversion;

The N road signal of each user among steps A 2, m the user that steps A 1 is obtained carries out signal and sends the processing in early stage, and is sent to channel;

The signal receiving course:

Step B1, receiving terminal receive post-processed with the signal that receives;

Signal after step B2, selective system parameter are handled step B1 is weighted fractional Fourier transform, obtain the N circuit-switched data after each the user's conversion among m the user, the N circuit-switched data after each the user's conversion among m user is carried out station address respectively and is selected back output;

M and N are positive integer.

2. mixed carrier system communication system mid-score according to claim 1 territory resource multiplexing method is characterized in that signal sends the method for handling early stage and may further comprise the steps:

Step C1, the N road signal that obtains of each user among m the user is sent signal processing behind weight score Fourier conversion, the N road signal after each user among m user obtains to handle, described transmission signal processing is for adding Cyclic Prefix;

Signal after step C2, the processing that step C1 is obtained carries out the D/A conversion;

Signal after step C3, the conversion that step C2 is obtained carries out upconversion process, finishes signal and sends and handle early stage.

3. mixed carrier system communication system mid-score according to claim 1 territory resource multiplexing method is characterized in that the method for signal reception post-processed may further comprise the steps:

Step D1, the signal that receives is carried out down-converted;

Signal after step D2, the processing that step D1 is obtained carries out the A/D conversion;

Signal after step D3, the conversion that step D2 is obtained carries out received signal to be handled, and the N road signal after each user among m user obtains to handle is finished signal reception post-processed; Described received signal is treated to the removal Cyclic Prefix.

4. mixed carrier system communication system mid-score territory resource multiplexing method, it is characterized in that: it is the weighted score territory multiplexing method in the mixed carrier system communication system, and it is realized by following steps:

The signal emission process:

Step e 1, a m user's input data are merged into the sequence of complex numbers that one tunnel length is N by the signal multiplexing module;

Step e 2, adopt the method for dynamic parameter selection to obtain system parameters, the road length that step e 1 is obtained is that the sequence of complex numbers of N is weighted fractional Fourier transform, obtains the signal after the conversion; Described system parameters is α, MV, NV;

Signal after step e 3, the conversion that step e 2 is obtained sends to be handled early stage;

Signal after step e 4, the processing that step e 3 is obtained carries out the D/A conversion;

Signal after step e 5, the conversion that step e 4 is obtained carries out upconversion process, and is emitted to channel;

The signal receiving course:

Step F 1, the signal that receives is carried out down-converted;

Signal after step F 2, the processing that step F 1 is obtained carries out the A/D conversion;

Signal after step F 3, the conversion that step F 2 is obtained carries out received signal to be handled;

The method of step F 4, employing dynamic parameter selection obtains system parameters, and the signal after the processing of step F 3 acquisitions is weighted fractional Fourier transform, the signal after the acquisition conversion; Described system parameters is-α, MV, NV;

Signal after step F 5, the conversion that step F 4 is obtained separates by separation module, obtains m user's dateout.

5. mixed carrier system communication system mid-score territory resource multiplexing method is characterized in that: the weighted score territory multiple access method in the mixed carrier system communication system, and it is realized by following steps:

The signal emission process:

Step G1, the data of user input are carried out station address respectively select, adopt the method for dynamic parameter selection to obtain system parameters, the N group data that obtain station address are weighted fractional Fourier transform respectively, obtain the N road signal after the conversion;

N road signal after step G2, the conversion that step G1 is obtained sends signal processing;

Signal after step G3, the processing that step G2 is obtained carries out the D/A conversion;

Signal after step G4, the conversion that step G3 is obtained carries out the up-conversion rate to be handled, and is sent to channel;

The signal receiving course:

Step H1, the signal that receives is carried out down-converted;

Signal after step H2, the processing that step H1 is obtained carries out the A/D conversion;

Signal after step H3, the conversion that step H2 is obtained carries out received signal to be handled;

The method of step H4, usefulness dynamic parameter selection obtains system parameters, and the signal after the processing that obtains among the step H3 is weighted fractional Fourier transform respectively, the signal after the acquisition N road conversion;

Signal after step H5, the N road conversion that step H4 is obtained carries out station address and extracts, and obtains user's N group data.

Images