CN103248592A - Hierarchical modulation-based multi-user data transmission method, system and relay node - Google Patents
Hierarchical modulation-based multi-user data transmission method, system and relay node Download PDFInfo
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Abstract
The invention discloses a hierarchical modulation-based multi-user data transmission method, system and relay node, wherein the method comprises the following steps: receiving a first multi-user data signal after hierarchical modulation from an originating node through the relay node; performing hierarchical modulation to various multi-user data by adopting power distribution parameters different from the originating node as per a principle enabling the system performance of destination nodes to be balanced after the various multi-user data are decoded successfully, then obtaining a second multi-user data signal, sending the second multi-user data signal; and performing combined decoding to the first multi-user data signal received by the destination nodes from the originating node and the second multi-user data signal from the relay node so as to obtain corresponding user data. The technical scheme disclosed by the invention can balance performance of destination nodes while ensuring the performance of the destination nodes.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to a kind of multi-user data transmission method, system and via node based on hierarchical modulation for relay system.
Background technology
Utilize hierarchical modulation can transmit a plurality of data flow, these data flow are modulated at respectively on high power distribution or the low-power distribute data to be transmitted.Usually the high power distribute data has more performance, and the low-power distribute data has poor slightly performance.Hierarchical modulation is particularly suitable for the bigger scene of received signal to noise ratio difference.For example, in relaying (Relay) system, relaying (Relay) node is nearer from transmitter (claiming transmitting terminal or source node again, as the base station), and its received signal to noise ratio is generally bigger.And the receiver (claiming receiving terminal or destination node, as user terminal) from transmitter away from, its received signal to noise ratio is lower.So relay system is an important application scene of hierarchical modulation.
Fig. 1 in the existing relay system based on an exemplary plot of the multi-user data transmission of hierarchical modulation.Be example with the situation of transmitting two user's data among Fig. 1, this method mainly comprises:
The modulation of high power allocation of parameters is used to user 1 data in the base station, user 2 data is used the modulation of low-power allocation of parameters, with the multi-user data signal after the modulation
Send.Wherein, ss
I1I data for the user 1 after the modulation; Ss
I2I data for the user 2 after the modulation;
α is the power division parameter, and 0＜α
2＜1/2.Wherein, the corresponding high power allocation of parameters modulation of high power distribute data, the corresponding low-power allocation of parameters modulation of low-power distribute data.After via node receives described signal, described signal is carried out the data demodulates decoding.If respective user 1 and user's 2 data are all decoded successfully (can pass through CRC check), then via node uses the power division parameter identical with the base station, user 1 data are used the modulation of high power allocation of parameters, user 2 data are used the modulation of low-power allocation of parameters, and the multi-user data signal after will modulating
Send.User terminal 1 and user terminal 2 receive the signal from base station and via node respectively, and the two is merged, and decode corresponding user 1 and user 2 data.In this method, because user 1 data all are modulated into the high power distribute data in base station and via node, user 2 data all are modulated into the low-power distribute data in base station and via node, cause user 1 performance to be better than user 2 performance always, make that the performance between the different user is unbalanced.
Be balance user 1 and user's 2 performance, proposed a kind of time domain average method at present.Namely in the moment 1, user 1 data are used the modulation of high power allocation of parameters at transmitting terminal and via node, and user 2 data are used the modulation of low-power allocation of parameters at transmitting terminal and via node.In the moment 2, user 1 data are used the modulation of low-power allocation of parameters at transmitting terminal and via node, and user 2 data are used the modulation of high power allocation of parameters at transmitting terminal and via node.By time domain average, user 1 and user 2 can obtain the homogeny energy afterwards.But because this performance is on average carried out in time domain, when same user's high power distribute data and low-power distribute data are averaged, the error rate of system (BER) performance is determined by the low-power distribute data usually, therefore concerning each user, the method for time domain average can cause its performance to reduce.
Summary of the invention
In view of this, a kind of multi-user data transmission method based on hierarchical modulation is provided among the present invention on the one hand, provide a kind of multi-user data transmission system and via node based on hierarchical modulation on the other hand, in order to when guaranteeing user performance, make user's balancing performance.
Multi-user data transmission method based on hierarchical modulation provided by the present invention comprises:
Via node receives from the first multi-user data signal after the hierarchical modulation of source node;
After via node is successfully decoded to each user data in the described first multi-user data signal, according to the principle that makes the equilibrium of destination node systematic function, hierarchical modulation after adopting the power division parameter different with source node that each user data is encoded, the second multi-user data signal that obtains is sent, respectively carry out demodulation to what receive from the first multi-user data signal of source node with from the second multi-user data signal of via node by each destination node, and after the signal after the demodulation merged, decoding obtained corresponding user data.
Wherein, described multi-user data comprises first user's data and second user's data;
The described first multi-user data signal is:
The described second multi-user data signal is:
Wherein, ss
I1I data for first user after the modulation; Ss
I2I data for second user after the modulation;
α, β,
Be the power division parameter, and 0＜α
2＜1/2,0＜β
2＜1/2, β 〉=α.
Preferably, this method further comprises: when only successfully decoding the user data that utilizes the modulation of high power allocation of parameters in the described first multi-user data signal as if via node, via node only will send after the described user data coded modulation that decodes.
Wherein, before the described second multi-user data signal that will obtain sends, further comprise: use and the redundant information of the identical or different check bit of source node as the described second multi-user data signal.
Multi-user data transmission system based on hierarchical modulation provided by the present invention comprises:
Source node for hierarchical modulation after adopting the first power division parameter that each user data is encoded, sends the first multi-user data signal that obtains;
Via node, be used for receiving the first multi-user data signal from described source node, after each user data in the described first multi-user data signal is successfully decoded, according to the principle that makes the equilibrium of destination node systematic function, hierarchical modulation after adopting the second power division parameter different with source node that each user data is encoded is sent the second multi-user data signal that obtains;
Each destination node, be used for to receive from the first multi-user data signal of source node with from the second multi-user data signal of via node, the described first multi-user data signal and the described second multi-user data signal are carried out demodulation respectively, and after the signal after the demodulation merged, decoding obtained corresponding user data.
Wherein, described multi-user data comprises first user's data and second user's data;
The first multi-user data signal that described source node obtains is
The second multi-user data signal that described via node obtains is
Wherein, ss
I1I data for first user after the modulation; Ss
I2I data for second user after the modulation;
α is the first power division parameter, β,
Be the second power division parameter, and 0＜α
2＜1/2,0＜β
2＜1/2, β 〉=α.
The via node that transmits based on the multi-user data of hierarchical modulation provided by the present invention comprises:
Receiver module is used for receiving from the first multi-user data signal after the hierarchical modulation of source node;
The demodulating and decoding module is used for each user data of the described first multi-user data signal is carried out demodulating and decoding;
First code modulation module, be used for after each user data of the described first multi-user data signal is successfully decoded, according to the principle that makes the equilibrium of destination node systematic function, hierarchical modulation after adopting the power division parameter different with source node that each user data is encoded obtains the second multi-user data signal;
Sending module is used for the described second multi-user data signal is sent to each destination node.
Wherein, described multi-user data comprises first user's data and second user's data;
The described first multi-user data signal is:
The described second multi-user data signal is:
Wherein, ss
I1I data for first user after the modulation; Ss
I2I data for second user after the modulation;
α, β,
Be the power division parameter, and 0＜α
2＜1/2,0＜β
2＜1/2, β 〉=α.
Preferably, this via node further comprises: second code modulation module, be used for only successfully decoding the described first multi-user data signal when utilizing the user data of high power allocation of parameters modulation in described demodulating and decoding module, to the back modulation of encoding of the described user data that decodes;
Described sending module is further used for the user data signal of described second code modulation module modulation is sent to corresponding destination node.
Wherein, the check bit that described first code modulation module further uses and source node is identical or different is as the redundant information of the described second multi-user data signal.
From such scheme as can be seen, an among the present invention because employing sign indicating number territory averaging method, in via node according to the principle that makes the equilibrium of destination node systematic function, adopt the power division parameter different with source node that each user data is carried out hierarchical modulation, make that systematic function can access equilibrium when destination node merged the back decoding to the signal from the signal of source node and via node that receives.And by the power division parameter of modulation via node, can find to make the equilibrium of destination node systematic function and make destination node obtain the power division parameter of better performance, thereby guarantee the performance of destination node.
In addition, for the situation that includes only two user's data, be higher than the low-power allocation of parameters in the power division parameter of source node by the low-power allocation of parameters in the power division parameter that makes via node, as when making β＞α, can obtain better system performance.
In addition, by using the check bit different with source node as the redundant information of multi-user data signal, can improve the error correcting capability of data.
Description of drawings
Fig. 1 in the existing relay system based on an exemplary plot of the multi-user data transmission of hierarchical modulation.
Fig. 2 is based on the schematic flow sheet of the multi-user data transmission method of hierarchical modulation in the embodiment of the invention.
Fig. 3 is based on the structural representation of the multi-user data transmission system of hierarchical modulation in the embodiment of the invention.
Fig. 4 is the structural representation of the via node in the system shown in Figure 3.
Fig. 5 concerns schematic diagram based on the signal to noise ratio between example base station shown in Figure 1, via node and each user terminal.
Fig. 6 a and Fig. 6 b are the systematic function analogous diagram relatively of the scheme of time domain average in scheme in the embodiment of the invention of each user's received signal to noise ratio when identical and the prior art.Wherein, Fig. 6 a is that code check is 1/2 o'clock comparison analogous diagram; Fig. 6 b is that code check is 3/4 o'clock comparison analogous diagram.
Fig. 7 a and Fig. 7 b are the systematic function analogous diagram relatively of the scheme of time domain average in scheme in the asynchronous embodiment of the invention of each user's received signal to noise ratio and the prior art.Wherein, Fig. 7 a is the comparison analogous diagram of the SNR between two users and the via node when being more or less the same, and Fig. 7 b is the comparison analogous diagram of the SNR between two users and the via node when differing big.
Embodiment
Among the present invention, in order when guaranteeing user performance, to make user's balancing performance, consider to adopt the average method in sign indicating number territory to carry out the systematic function equilibrium.This method adopts the power division parameter different with source node that each user data is carried out hierarchical modulation according to the principle that makes the equilibrium of destination node systematic function at via node.For example, situation with two user's data is example, when source node uses the modulation of high power allocation of parameters to user 1 data, when user 2 data are used the modulation of low-power allocation of parameters, via node uses the modulation of low-power allocation of parameters to user 1 data, and user 2 data are used the modulation of high power allocation of parameters.Like this when each destination node to merging and when decoding, the systematic function of each destination node can access equilibrium from the signal of source node with from the signal of via node.
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
Fig. 2 is based on the schematic flow sheet of the multi-user data transmission method of hierarchical modulation in the embodiment of the invention.As shown in Figure 2, this method comprises the steps:
Hierarchical modulation after step 201, source node adopt the first power division parameter that each user data is encoded is sent the first multi-user data signal that obtains.
The specific implementation process of this step can be consistent with specific implementation process of the prior art.For example, corresponding exemplary plot shown in Figure 1, the modulation of high power allocation of parameters can be used to user 1 data in the base station, and user 2 data are used the modulation of low-power allocation of parameters, for example, the multi-user data signal after the modulation equally can for
Wherein, ss
I1I data for the user 1 after the modulation; Ss
I2I data for the user 2 after the modulation;
α is the first power division parameter, and 0＜α
2＜1/2.Wherein, the corresponding high power allocation of parameters modulation of high power distribute data, the corresponding low-power allocation of parameters modulation of low-power distribute data.
In this step, the systematic function equilibrium of destination node may be embodied in the Block Error Rate of each destination node, and (block error rate, BLER) on the mean value, lower BLER mean value means better system equalization.
In addition, the power division parameter that corresponding source node adopts according to the principle that makes the equilibrium of destination node systematic function, can be determined the power division parameter that via node need adopt.
For example, exemplary plot corresponding shown in Figure 1, in the base station user 1 data are used the modulation of high power allocation of parameters, when user 2 data are used the modulation of low-power allocation of parameters, via node can use the modulation of low-power allocation of parameters to user 1 data, user 2 data are used the modulation of high power allocation of parameters, as, the multi-user data signal after the modulation can for
Wherein, β,
Be the second power division parameter, and 0＜β
2＜1/2.Wherein, the value of β can be consistent with α, also can be different with α.For example, consider via node from the distance of destination node than source node close to the distance of destination node, so the ratio α that the value of β can be established is bigger, to obtain better system performance.That is, in the present embodiment, preferably, get β 〉=α.
During specific implementation, the power division parameter that source node adopts and the power division parameter of via node all can be determined by emulation or empirical value.Exemplary plot corresponding shown in Figure 1, then the value of α and β all can determine that target is to make the destination node user have best average BLER performance by emulation or empirical value.
Wherein, based on the power division parameter that fixed source node adopts, can be according to channel conditions, modulator approach, the chnnel coding code check, destination node signal to noise ratio difference etc. is carried out emulation or is rule of thumb determined the power division parameter of via node.Exemplary plot corresponding shown in Figure 1, based on fixed α, can be further according to channel conditions, modulator approach, the chnnel coding code check, destination node signal to noise ratio difference etc. is carried out emulation or is rule of thumb determined β.
Further, after each power division parameter of each power division parameter of determining source node and via node, the mapping relations of the power division parameter of the power division parameter of source node and via node also can be set at via node, then in this step, the power division parameter that can adopt according to source node is searched the power division parameter that these mapping relations draw via node.
In this step, when the second multi-user data signal that will obtain sends, can use the check bit different with source node as redundant information, to promote the error correcting capability of data.
For example, exemplary plot corresponding shown in Figure 1, user terminal 1 and user terminal 2 receive respectively from the multi-user data signal of base station with from the multi-user data signal of via node, and after respectively the two being merged demodulating and decoding, obtain user 1 data and user 2 data respectively.
During specific implementation, if when only successfully decoding the user data that utilizes high power allocation of parameters modulation in the first multi-user data signal in the step 202, after using conventional the modulation, send the user data that via node can only will describedly decode.For example, exemplary plot corresponding shown in Figure 1, if only successfully decode user 1 data in the step 202, then via node can adopt traditional quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) method or phase place modulation (PSK, phase-shift keying) is carried out sending after the coded modulation to this user's 1 data.Certainly, also can adopt the above-mentioned modulator approach that makes the equilibrium of destination node systematic function in the present embodiment.If when successfully not decoding the arbitrary user data in the first multi-user data signal in the step 202, then via node can send 0 signal.Perhaps, all customer data as if successfully not decoding in the step 202 in the first multi-user data signal also can not send any signal.Specifically can determine according to actual needs, it not limited herein.
Adopt the described method of Fig. 2, can realize that the sign indicating number territory of performance is average, make the equilibrium that when guaranteeing the destination node performance, realizes each destination node performance.
More than the multi-user data transmission method based on hierarchical modulation in the embodiment of the invention is described in detail, again the multi-user data transmission system based on hierarchical modulation in the embodiment of the invention is described in detail below.
Fig. 3 shows in the embodiment of the invention structural representation based on the multi-user data transmission system of hierarchical modulation.As shown in Figure 3, this system comprises: source node, via node and a plurality of destination node.
Wherein, hierarchical modulation after source node is used for adopting the first power division parameter that each user data is encoded is sent the first multi-user data signal that obtains.
Via node is used for receiving the first multi-user data signal from described source node, after each user data in the described first multi-user data signal is successfully decoded, according to the principle that makes the equilibrium of destination node systematic function, hierarchical modulation after adopting the second power division parameter different with source node that each user data is encoded is sent the second multi-user data signal that obtains.
Each destination node be used for to receive from the first multi-user data signal of source node with from the second multi-user data signal of via node, the described first multi-user data signal and the described second multi-user data signal are carried out demodulation respectively, and after the signal after the demodulation merged, decoding obtained corresponding user data.
Wherein, the specific operation process of via node can be consistent to the description in the step 203 with step 202.For example, corresponding exemplary plot shown in Figure 1, the first multi-user data signal can for:
The second multi-user data signal can for:
Wherein, ss
I1I data for the user 1 after the modulation; Ss
I2I data for the user 2 after the modulation;
α is the first power division parameter, β,
Be the second power division parameter, and 0＜α
2＜1/2,0＜β
2＜1/2, β 〉=α.
Equally, before the second multi-user data signal that will obtain sends, also can use the check bit different with source node as redundant information, to promote the error correcting capability of data.
In addition, when only successfully decoding the user data that utilizes the modulation of high power allocation of parameters in the first multi-user data signal as if via node, then via node can only will send after the described user data coded modulation that decodes.For example, exemplary plot corresponding shown in Figure 1, if via node only successfully decodes user 1 data, then via node can adopt traditional QAM or PSK method that this user's 1 data are carried out sending after the coded modulation; Perhaps, also can adopt the modulator approach of describing in the present embodiment that makes the equilibrium of destination node systematic function.If when via node did not successfully decode arbitrary user data in the first multi-user data signal, then via node can send 0 signal.Perhaps, if via node does not successfully decode all customer data in the first multi-user data signal, also can not send any signal.Specifically can determine according to actual needs, it not limited herein.
During specific implementation, the internal structure of via node can have multiple specific implementation form.Fig. 4 shows wherein a kind of structural representation of specific implementation form.As shown in Figure 4, this via node can comprise: receiver module, demodulating and decoding module, first code modulation module and sending module.
Wherein, receiver module is used for receiving from the first multi-user data signal after the hierarchical modulation of source node.
The demodulating and decoding module is used for each user data of the described first multi-user data signal is carried out demodulating and decoding.
First modulation module is used for after described demodulating and decoding module successfully decodes each user data of the first multi-user data signal, according to the principle that makes the equilibrium of destination node systematic function, hierarchical modulation after adopting the power division parameter different with source node that each user data is encoded obtains the second multi-user data signal.
Sending module is used for the described second multi-user data signal is sent to each destination node.
Corresponding with method shown in Figure 2, this via node can further comprise: second code modulation module, be used for only successfully decoding the described first multi-user data signal when utilizing the user data of high power allocation of parameters modulation in described demodulating and decoding module, the described user data that decodes is carried out coded modulation.Correspondingly, described sending module can be further used for the user data signal of described second code modulation module modulation is sent to corresponding destination node.
Corresponding with method shown in Figure 2, described first code modulation module in this via node can further use and the redundant information of the identical or different check bit of source node as the described second multi-user data signal.
Among the present invention, owing to adopt sign indicating number territory averaging method, in via node according to the principle that makes the equilibrium of destination node systematic function, adopt the power division parameter different with source node that each user data is carried out hierarchical modulation, make that systematic function can access equilibrium when destination node merged decoding to the signal from the signal of source node and via node that receives.And make the equilibrium of destination node systematic function and make destination node obtain the power division parameter of better performance by adjusting the power division parameter of via node, can finding, thereby guaranteed the performance of destination node.
In addition, for the situation that includes only two user's data, be higher than the low-power allocation of parameters in the power division parameter of source node by the low-power allocation of parameters in the power division parameter that makes via node, can obtain better system performance.
In addition, by using the check bit different with source node as the redundant information of multi-user data signal, can improve the error correcting capability of data.
Below the average scheme in sign indicating number territory in the embodiment of the invention and the systematic function of the scheme of time domain average of the prior art are carried out the emulation comparison.
Fig. 5 concerns schematic diagram based on the signal to noise ratio between example base station shown in Figure 1, via node and each user terminal.As shown in Figure 5, the signal to noise ratio between user terminal 1 and the base station is SNR, and the signal to noise ratio between user terminal 2 and the base station is SNR, and the signal to noise ratio between via node and the base station is SNR
1, the signal to noise ratio between user terminal 1 and the via node is SNR
21, the signal to noise ratio between user terminal 2 and the via node is SNR
22
Fig. 6 a and Fig. 6 b are the systematic function analogous diagram relatively of the scheme of time domain average in scheme in the embodiment of the invention of each user's received signal to noise ratio when identical and the prior art.Be example with the situation that comprises two user's data among Fig. 6 a and Fig. 6 b, simulated conditions is: channel model: flat fading channel (Flat fading channel); Every frame symbolic number: 256 bits; Modulator approach: ss
I1And ss
I2Adopt quarternary phase-shift keying (QPSK) modulation (QPSK); Signal to noise ratio (snr) relational expression: SNR
1=SNR+10dB, SNR
21=SNR
22=SNR+6dB; Power division parameter in the present embodiment scheme:
Power division parameter in the time domain average scheme:
(because α gets
Get than α
More performance is arranged, get herein
).Fig. 6 a is that code check is 1/2 o'clock comparison analogous diagram; Fig. 6 b is that code check is 3/4 o'clock comparison analogous diagram.Among Fig. 6 a and Fig. 6 b, abscissa is SNR, and ordinate is each user's BER mean value.
Shown in Fig. 6 a and Fig. 6 b, under the identical situation of each user's received signal to noise ratio, adopt technical scheme in the embodiment of the invention to reduce and reach same services quality (QoS, Quality of Service) required signal to noise ratio the time, or under the situation of identical signal to noise ratio, can obtain the higher availability of frequency spectrum, namely have lower BER.
Fig. 7 a and Fig. 7 b are the systematic function analogous diagram relatively of the scheme of time domain average in scheme in the asynchronous embodiment of the invention of each user's received signal to noise ratio and the prior art.Same among Fig. 7 a and Fig. 7 b is example with the situation that comprises two user's data, and simulated conditions is: channel model: flat fading channel (Flat fading channel); Every frame coded bit number: 256; Modulator approach: ss
I1And ss
I2Adopt quarternary phase-shift keying (QPSK) modulation (QPSK); Code check: 1/2; Power division parameter in the present embodiment scheme:
Power division parameter in the time domain average scheme:
Fig. 7 a is the comparison analogous diagram of the SNR between two users and the via node when being more or less the same, as SNR relational expression: SNR
1=SNR+10dB, SNR
21=SNR+6dB, SNR
22=SNR+9dB; Fig. 7 b is the comparison analogous diagram of the SNR between two users and the via node when differing big, as SNR relational expression: SNR
1=SNR+10dB, SNR
21=SNR+3dB, SNR
22=SNR+9dB.Among Fig. 7 a and Fig. 7 b, abscissa is SNR, and ordinate is each user's BER mean value.
Shown in Fig. 7 a and Fig. 7 b, under the different situation of each user's received signal to noise ratio, adopt the technical scheme in the embodiment of the invention still to have certain advantage than the scheme that adopts traditional time domain average, when the SNR between two users and via node differs big, adopt the technical scheme in the embodiment of the invention also can obtain the performance that is not inferior to traditional time domain average scheme.
" reception " word in the embodiment of the invention can be understood as and initiatively obtains from other modules also can be to receive the information that other modules are sent.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of above-described embodiment can be merged into a module, also can further split into a plurality of submodules.
Part steps in the embodiment of the invention can utilize software to realize, corresponding software program can be stored in the storage medium that can read, as CD or hard disk etc.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is preferred embodiment of the present invention; be not for limiting protection scope of the present invention; within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. multi-user data transmission method based on hierarchical modulation is characterized in that this method comprises:
Via node receives from the first multi-user data signal after the hierarchical modulation of source node;
After via node is successfully decoded to each user data in the described first multi-user data signal, according to the principle that makes the equilibrium of destination node systematic function, hierarchical modulation after adopting the power division parameter different with source node that each user data is encoded, the second multi-user data signal that obtains is sent, respectively carry out demodulation to what receive from the first multi-user data signal of source node with from the second multi-user data signal of via node by each destination node, and after the signal after the demodulation merged, decoding obtained corresponding user data.
2. method according to claim 1 is characterized in that, described multi-user data comprises first user's data and second user's data;
The described first multi-user data signal is:
The described second multi-user data signal is:
Wherein, ss
I1I data for first user after the modulation; Ss
I2I data for second user after the modulation;
α, β,
Be the power division parameter, and 0＜α
2＜1/2,0＜β
2＜1/2, β 〉=α.
3. method according to claim 1 and 2, it is characterized in that, this method further comprises: when only successfully decoding the user data that utilizes the modulation of high power allocation of parameters in the described first multi-user data signal as if via node, via node only will send after the described user data coded modulation that decodes.
4. method according to claim 1 and 2, it is characterized in that, before the described second multi-user data signal that will obtain sends, further comprise: use and the redundant information of the identical or different check bit of source node as the described second multi-user data signal.
5. via node based on the transmission of the multi-user data of hierarchical modulation is characterized in that this via node comprises:
Receiver module is used for receiving from the first multi-user data signal after the hierarchical modulation of source node;
The demodulating and decoding module is used for each user data of the described first multi-user data signal is carried out demodulating and decoding;
First code modulation module, be used for after each user data of the described first multi-user data signal is successfully decoded, according to the principle that makes the equilibrium of destination node systematic function, hierarchical modulation after adopting the power division parameter different with source node that each user data is encoded obtains the second multi-user data signal;
Sending module is used for the described second multi-user data signal is sent to each destination node.
6. via node according to claim 5 is characterized in that, described multi-user data comprises first user's data and second user's data;
The described first multi-user data signal is:
The described second multi-user data signal is:
Wherein, ss
I1I data for first user after the modulation; Ss
I2I data for second user after the modulation;
α, β,
Be the power division parameter, and 0＜α
2＜1/2,0＜β
2＜1/2, β 〉=α.
7. according to claim 5 or 6 described via nodes, it is characterized in that, this via node further comprises: second code modulation module, be used for only successfully decoding the described first multi-user data signal when utilizing the user data of high power allocation of parameters modulation in described demodulating and decoding module, to the back modulation of encoding of the described user data that decodes;
Described sending module is further used for only the user data signal of described second code modulation module modulation being sent to the destination node of correspondence.
8. according to claim 5 or 6 described via nodes, it is characterized in that the check bit that described first code modulation module further uses and source node is identical or different is as the redundant information of the described second multi-user data signal.
9. multi-user data transmission system based on hierarchical modulation is characterized in that this system comprises:
Source node for hierarchical modulation after adopting the first power division parameter that each user data is encoded, sends the first multi-user data signal that obtains;
Via node, be used for receiving the first multi-user data signal from described source node, after each user data in the described first multi-user data signal is successfully decoded, according to the principle that makes the equilibrium of destination node systematic function, hierarchical modulation after adopting the second power division parameter different with source node that each user data is encoded is sent the second multi-user data signal that obtains;
Each destination node, be used for to receive from the first multi-user data signal of source node with from the second multi-user data signal of via node, the described first multi-user data signal and the described second multi-user data signal are carried out demodulation respectively, and after the signal after the demodulation merged, decoding obtained corresponding user data.
10. system according to claim 9 is characterized in that, described multi-user data comprises first user's data and second user's data;
The first multi-user data signal that described source node obtains is
The second multi-user data signal that described via node obtains is
Wherein, ss
I1I data for first user after the modulation; Ss
I2I data for second user after the modulation;
α is the first power division parameter, β,
Be the second power division parameter, and 0＜α
2＜1/2,0＜β
2＜1/2, β 〉=α.
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