CN103248592B - Multi-user data transmission method, system and relay node based on hierarchical modulation - Google Patents
Multi-user data transmission method, system and relay node based on hierarchical modulation Download PDFInfo
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Abstract
The invention discloses a kind of multi-user data transmission method, system and relay node based on hierarchical modulation.Wherein, method includes：Relay node receives the first multi-user data signal after the hierarchical modulation from source node；After each user data in the first multi-user data signal is successfully decoded, according to the principle for making the equilibrium of destination node system performance, hierarchical modulation is carried out to each user data using the power allocation of parameters different from source node, the second obtained multi-user data signal is sent, the first multi-user data signal from source node of reception and the second multi-user data signal from relay node are merged by each destination node and decode and obtain corresponding user data.Technical solution disclosed in this invention, can make destination node balancing performance while destination node performance is ensured.
Description
Technical field
The present invention relates to wireless communication technique, more particularly to a kind of multi-purpose amount for being based on hierarchical modulation (nonopiate access)
According to transmission method, system and relay node.
Background technology
Hierarchical modulation can modulate the data of multiple users on same resource block (time domain, frequency domain, spatial domain etc.),.This
The orthogonal multiple-user access method that a resource block is monopolized from each user is different.Hierarchical modulation belongs to nonopiate access technology,
" hierarchical modulation " specifically described herein available " nonopiate access " substitutes.Multiple data flows can be transmitted using hierarchical modulation,
These data flows are modulated in high power distribution or low-power distribution data and are transmitted respectively.Usual high power distribution data
With better performance, and low-power distribution data have slightly worse performance.Hierarchical modulation is particularly suitable for received signal to noise ratio difference
Larger scene.For example, in (Relay) system of relaying, relaying (Relay) node is from transmitter (also known as transmitting terminal or source section
Point, such as base station) it is relatively near, its received signal to noise ratio is generally large.And receiver (also known as receiving terminal or destination node, such as user terminal)
Generally from transmitter farther out, its received signal to noise ratio is relatively low.So relay system is an important application scene of hierarchical modulation.
Fig. 1 is an exemplary plot of the multi-user data transmission based on hierarchical modulation in existing relay system.With biography in Fig. 1
In case of the data of defeated two users, this method mainly includes：
Base station modulates the data of user 1 using high power allocation of parameters, and low-power distribution ginseng is used to the data of user 2
Number modulation, by modulated multi-user data signalSend.Wherein, ssi1For modulated user 1
I-th of data；ssi2For i-th of data of modulated user 2；α is power allocation of parameters, and 0 ＜ α2＜ 1/
2.Wherein, high power distribution data correspond to the modulation of high power allocation of parameters, and low-power distribution data correspond to low-power allocation of parameters
Modulation.After relay node receives the signal, data demodulation decoding is carried out to the signal.If corresponding user 1 and user 2
Data all successfully decodeds (CRC check can be passed through), then relay node use the power allocation of parameters identical with base station, by user
1 data are modulated using high power allocation of parameters, and the data of user 2 are modulated using low-power allocation of parameters, and will be modulated
Multi-user data signalSend.User terminal 1 and user terminal 2 are received from base station with respectively
Merged after the signal of node, and to the two, decode the data of corresponding user 1 and user 2.In this method, due to
The data of user 1 are all modulated into high power distribution data in base station and relay node, and the data of user 2 are saved in base station and relaying
Point is all modulated into low-power distribution data, causes the performance of user 1 to be better than the performance of user 2 always so that different user it
Between performance it is unbalanced.
The content of the invention
In view of this, a kind of multi-user data transmission method based on hierarchical modulation is on the one hand provided in the present invention, it is another
Aspect provides a kind of multi-user data Transmission system and relay node based on hierarchical modulation, to ensure the same of user performance
When make user's balancing performance.
Multi-user data transmission method provided by the present invention based on hierarchical modulation, including：
Relay node receives the first multi-user data signal after the hierarchical modulation from source node；
After each user data in the first multi-user data signal is successfully decoded in relay node, according to making purpose section
The principle of dot system balancing performance, is classified after being encoded using the power allocation of parameters different from source node to each user data
Modulation, the second obtained multi-user data signal is sent, first from source node of reception is used by each destination node
User data signal and the second multi-user data signal from relay node are demodulated respectively, and the signal after demodulation is carried out
After merging, decoding obtains corresponding user data.
Wherein, the multi-user data includes the data of the first user and the data of second user；
The first multi-user data signal is：
The second multi-user data signal is：
Wherein, ssi1For i-th of data of modulated first user；ssi2For i-th of number of modulated second user
According to；For power allocation of parameters, and 0 ＜ α21/2,0 ＜ β of ＜2＜ 1/2, β >=α.
It is preferred that this method further comprises：If the first multi-user data signal is only successfully decoded out in relay node
It is middle using high power allocation of parameters modulate user data when, relay node is only by the user data coded modulation decoded
After send.
Wherein, it is described the second obtained multi-user data signal is sent before, further comprise：Using with source node phase
Redundancy of the same or different check bit as the second multi-user data signal.
Multi-user data Transmission system provided by the present invention based on hierarchical modulation, including：
Source node, for hierarchical modulation after being encoded using the first power allocation of parameters to each user data, will obtain
The first multi-user data signal send；
Relay node, for receiving the first multi-user data signal from the source node, multi-purpose to described first
After each user data in user data signal is successfully decoded, according to the principle for making the equilibrium of destination node system performance, use and source
Hierarchical modulation after the second different power allocation of parameters of node encodes each user data, by the obtain second multi-purpose amount
It is believed that number sending；
Each destination node, for receiving the first multi-user data signal from source node and the from relay node
Two multi-user data signals, solve the first multi-user data signal and the second multi-user data signal respectively
Adjust, and after the signal after demodulation is merged, decoding obtains corresponding user data.
Wherein, the multi-user data includes the data of the first user and the data of second user；
The first multi-user data signal that the source node obtains is
The second multi-user data signal that the relay node obtains is
Wherein, ssi1For i-th of data of modulated first user；ssi2For i-th of number of modulated second user
According to；α is the first power allocation of parameters, β,For the second power allocation of parameters, and 0 ＜ α21/2,0 ＜ β of ＜2
＜ 1/2, β >=α.
The relay node of multi-user data transmission provided by the present invention based on hierarchical modulation, including：
Receiving module, for the first multi-user data signal after hierarchical modulation of the reception from source node；
Demodulating and decoding module, for being demodulated decoding to each user data in the first multi-user data signal；
First code modulation module, is successfully decoded for each user data in the first multi-user data signal
Afterwards, according to the principle for making the equilibrium of destination node system performance, using the power allocation of parameters different from source node to each number of users
According to hierarchical modulation after being encoded, the second multi-user data signal is obtained；
Sending module, for the second multi-user data signal to be sent to each destination node.
Wherein, the multi-user data includes the data of the first user and the data of second user；
The first multi-user data signal is：
The second multi-user data signal is：
Wherein, ssi1For i-th of data of modulated first user；ssi2For i-th of number of modulated second user
According to；α, β,For power allocation of parameters, and 0 ＜ α21/2,0 ＜ β of ＜2＜ 1/2, β >=α.
It is preferred that the relay node further comprises：Second code modulation module, in the demodulating and decoding module only
When the user data using the modulation of high power allocation of parameters is successfully decoded out in the first multi-user data signal, to the solution
The user data that code goes out is modulated after being encoded；
The sending module is further used for the user data signal of second code modulation module modulation being sent to
Corresponding destination node.
Wherein, first code modulation module further uses the check bit identical or different with source node as institute
State the redundancy of the second multi-user data signal.
The present invention also provides a kind of multi-user data transmission method based on hierarchical modulation, including：
Source node is used according to the first user with the first power, the principle structure of the second power of second user at the first moment
Into the first power allocation of parameters hierarchical modulation is carried out to the data of two users, the first obtained multi-user data signal is sent out
Go out；First power is more than the second power；
Source node is used according to the first user with the 3rd power, the principle structure of the 4th power of second user at the second moment
Into the second power allocation of parameters to described two user data carry out hierarchical modulation, the second multi-user data signal that will be obtained
Send；3rd power is less than the 4th power；The first multi-user data by the corresponding destination node of two users to reception
Signal and the second multi-user data signal are demodulated respectively, and after the signal after demodulation is merged, decoding obtains corresponding
User data.
From such scheme as can be seen that due to using code domain averaging method in the present invention, according to making mesh in relay node
Node system balancing performance principle, classification tune is carried out to each user data using the power allocation of parameters different from source node
System so that when destination node decodes after being merged to the signal of signal of the reception from source node and relay node, system
Performance can be equalized.And by modulating the power allocation of parameters of relay node, can find makes destination node systemic
Energy is balanced and makes the power allocation of parameters of the preferable performance of destination node acquisition, so as to ensure that the performance of destination node.
In addition, in the case of the data of two users are only included, by making in the power allocation of parameters of relay node
Low-power allocation of parameters when such as making β ＞ α, can obtain more higher than the low-power allocation of parameters in the power allocation of parameters of source node
Good system performance.
In addition, by using redundancy of the check bit different from source node as multi-user data signal, can carry
The error correcting capability of high data.
Brief description of the drawings
Fig. 1 is an exemplary plot of the multi-user data transmission based on hierarchical modulation in existing relay system.
Fig. 2 is the flow diagram of the multi-user data transmission method based on hierarchical modulation in the embodiment of the present invention.
Fig. 3 is the structure diagram of the multi-user data Transmission system based on hierarchical modulation in the embodiment of the present invention.
Fig. 4 is the structure diagram of the relay node in system shown in Figure 3.
Fig. 5 is based on the Between Signal To Noise Ratio schematic diagram between Fig. 1 example showns base station, relay node and each user terminal.
Fig. 6 a and Fig. 6 b be each user's received signal to noise ratio it is identical when the embodiment of the present invention in scheme with the prior art
The system performance of the scheme of time domain average compares analogous diagram.Wherein, Fig. 6 a are comparison analogous diagrams when code check is 1/2；Fig. 6 b are
Comparison analogous diagram when code check is 3/4.
Fig. 7 a and Fig. 7 b are for the scheme in each asynchronous embodiment of the present invention of user's received signal to noise ratio and in the prior art
The system performance of the scheme of time domain average compares analogous diagram.Wherein, Fig. 7 a are that two SNR between user and relay node are differed
Comparison analogous diagram when less, Fig. 7 b are comparison analogous diagrams when two SNR between user and relay node differ larger.
Embodiment
In the present invention, it is balancing user 1 and the performance of user 2, is currently suggested a kind of time domain average.I.e. at the moment
1, the data of user 1 are modulated in transmitting terminal and relay node using high power allocation of parameters, the data of user 2 transmitting terminal and in
Modulated after node using low-power allocation of parameters.At the moment 2, the data of user 1 use low-power in transmitting terminal and relay node
Allocation of parameters is modulated, and the data of user 2 are modulated in transmitting terminal and relay node using high power allocation of parameters.Pass through time domain afterwards
Average, user 1 and user 2 can obtain same performance.That is, transmitting terminal (i.e. source node, such as base station) is adopted at the second moment
Hierarchical modulation is carried out to each user data with the power allocation of parameters different from the first moment.Each destination node will be received afterwards
The first moment and the signal at the second moment when merging and decoding, the system performance of each destination node can be equalized.
Wherein, at the time of the second moment can be corresponding to the re-transmission after the bust this of the first moment.
Above-mentioned this performance is carried out in time domain, is divided when by the high power distribution data of same user with low-power
Mean time is carried out with data, the bit error rate (BER) performance of system is usually determined by low-power distribution data, therefore to each user
For, the method for time domain average may result in the reduction of its performance.
In order to make user's balancing performance while user performance is ensured, it is considered as the average method of code domain and carries out
System performance is balanced.This method is used with source node not according to the principle for making the equilibrium of destination node system performance in relay node
Same power allocation of parameters carries out hierarchical modulation to each user data.For example, in case of the data of two users, work as source
Node modulates the data of user 1 using high power allocation of parameters, and the data of user 2 are modulated using low-power allocation of parameters
When, relay node modulates the data of user 1 using low-power allocation of parameters, and high power distribution ginseng is used to the data of user 2
Number modulation.So when each destination node is merged and decoded to the signal from source node and the signal from relay node
When, the system performance of each destination node can be equalized.
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and attached drawing, to this
Invention is further described.
Fig. 2 is the flow diagram of the multi-user data transmission method based on hierarchical modulation in the embodiment of the present invention.Such as Fig. 2
Shown, this method comprises the following steps：
Step 201, hierarchical modulation after source node encodes each user data using the first power allocation of parameters, will
To the first multi-user data signal send.
The specific implementation process of this step can be consistent with specific implementation process of the prior art.For example, shown in corresponding diagram 1
Exemplary plot, base station can be modulated the data of user 1 using high power allocation of parameters, and low-power point is used to the data of user 2
With Parameter Modulation, for example, modulated multi-user data signal equally can beWherein, ssi1
For i-th of data of modulated user 1；ssi2For i-th of data of modulated user 2；α is the first power
Allocation of parameters, and 0 ＜ α2＜ 1/2.Wherein, high power distribution data correspond to the modulation of high power allocation of parameters, low-power distribution number
Modulated according to corresponding low-power allocation of parameters.
Step 202, relay node receives the first multi-user data signal after the hierarchical modulation from source node, and to institute
State the first multi-user data signal and be demodulated decoding, if each user data in the first multi-user data signal is successful
Decode, then perform step 203.
Step 203, according to the principle for making the equilibrium of destination node system performance, using second power different from source node point
Hierarchical modulation after being encoded with parameter to each user data, the second obtained multi-user data signal is sent.
In this step, the system performance equilibrium of destination node may be embodied in Block Error Rate (the block error of each destination node
Rate, BLER) on average value, lower BLER average values mean more preferable system equalization.
In addition, power allocation of parameters used by corresponding source node, according to the principle for making the equilibrium of destination node system performance,
It can determine that the power allocation of parameters that relay node need to use.
For example, the exemplary plot shown in corresponding diagram 1, is modulated the data of user 1 using high power allocation of parameters in base station, it is right
When the data of user 2 are modulated using low-power allocation of parameters, relay node can use low-power allocation of parameters to the data of user 1
Modulation, the data of user 2 is modulated using high power allocation of parameters, e.g., modulated multi-user data signal can beWherein, β,For the second power allocation of parameters, and 0 ＜ β2＜ 1/2.Wherein, β takes
Value can be consistent with α, also can be different from α.For example, it is contemplated that to relay node with a distance from destination node than source node from destination node
Distance it is near, therefore the ratio α that the value of β can be set is larger, to obtain more preferable system performance.That is, in the present embodiment, preferably
Ground, takes β >=α.
During specific implementation, power allocation of parameters and the power allocation of parameters of relay node can pass through used by source node
Emulation or empirical value determine.Exemplary plot shown in corresponding diagram 1, then the value of α and β can by emulation or empirical value determine, mesh
Mark is destination node user is had best average BLER performances.
Wherein, based on fixed source node used by power allocation of parameters, can according to channel conditions, modulator approach,
Channel coding code check, destination node signal-to-noise ratio difference etc. is emulated or the power of empirically determined out-trunk node distribution ginseng
Number.Exemplary plot shown in corresponding diagram 1, can be further according to channel conditions, modulator approach, channel coding code based on fixed α
Rate, destination node signal-to-noise ratio difference etc. emulated or it is empirically determined go out β.
Further, determine each power allocation of parameters of source node and relay node each power allocation of parameters it
Afterwards, the mapping relations of the power allocation of parameters of source node and the power allocation of parameters of relay node can be also set in relay node,
Then in this step, the power that the mapping relations draw relay node can be searched according to power allocation of parameters used by source node
Allocation of parameters.
In this step, when the obtain second multi-user data signal is sent, the verification different from source node can be used
Bit is as redundancy, to lift the error correcting capability of data.
Step 204, each destination node receives the first multi-user data signal from source node and from relay node
Second multi-user data signal, is demodulated the two respectively, and after the signal after demodulation is merged, decoding is corresponded to
User data.Specifically, the likelihood ratio demodulation of the two can be calculated respectively, and is carried out after the likelihood ratio information calculated is merged
Decoding.
For example, the exemplary plot shown in corresponding diagram 1, user terminal 1 and user terminal 2 receive the multi-user from base station respectively
Data-signal and the multi-user data signal from relay node, and after merging demodulating and decoding to the two respectively, respectively
To the data of user 1 and the data of user 2.
During specific implementation, distributed if being only successfully decoded out in step 202 in first multi-user data signal using high power
During the user data of Parameter Modulation, relay node can be only by the user data decoded using being sent after traditional modulation.Example
Such as, the exemplary plot shown in corresponding diagram 1, if the data of user 1 are only successfully decoded out in step 202, relay node can be used and passed
System quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) method or phase-modulation (PSK,
Phase-shift keying) to being sent after the data progress coded modulation of the user 1.Certainly, can also use in the present embodiment
The above-mentioned modulator approach for making the equilibrium of destination node system performance.If the first multi-user data is decoded in step 202 not successfully
During any user data in signal, then 0 signal can be transmitted in relay node.Alternatively, if first is decoded in step 202 not successfully
All customer data in multi-user data signal, can not also send any signal.It can specifically be determined according to being actually needed, herein
It is not limited thereof.
Using Fig. 2 the methods, it is possible to achieve the code domain of performance is averaged so that real while destination node performance is ensured
The now equilibrium of each destination node performance.
The multi-user data transmission method based on hierarchical modulation in the embodiment of the present invention is described in detail above, under
Face is again described in detail the multi-user data Transmission system based on hierarchical modulation in the embodiment of the present invention.
Fig. 3 shows the structure diagram of the multi-user data Transmission system based on hierarchical modulation in the embodiment of the present invention.
As shown in figure 3, the system includes：Source node, relay node and multiple destination nodes.
Wherein, source node is used for hierarchical modulation after being encoded using the first power allocation of parameters to each user data, will
The first obtained multi-user data signal is sent.
Relay node is used to receive the first multi-user data signal from the source node, to first multi-user
After each user data in data-signal is successfully decoded, according to the principle for making the equilibrium of destination node system performance, saved using with source
Hierarchical modulation after the second different power allocation of parameters of point encodes each user data, the second multi-user data that will be obtained
Signal is sent.
Each destination node is used to receive the first multi-user data signal from source node and the from relay node
Two multi-user data signals, solve the first multi-user data signal and the second multi-user data signal respectively
Adjust, and after the signal after demodulation is merged, decoding obtains corresponding user data.
Wherein, the specific operation process of relay node can be consistent with the description in step 202 to step 203.It is for example, corresponding
Exemplary plot shown in Fig. 1, the first multi-user data signal can be：Second multi-user data is believed
Number can be：Wherein, ssi1For i-th of data of modulated user 1；ssi2After modulation
User 2 i-th of data；α is the first power allocation of parameters, β,For the second power allocation of parameters, and
0 ＜ α21/2,0 ＜ β of ＜2＜ 1/2, β >=α.
Equally, before the obtain second multi-user data signal is sent, it is possible to use the verification different from source node
Bit is as redundancy, to lift the error correcting capability of data.
Modulated in addition, if relay node is only successfully decoded out in the first multi-user data signal using high power allocation of parameters
User data when, then relay node will only can be sent after the user data coded modulation decoded.For example, corresponding diagram 1
Shown exemplary plot, if the data of user 1 are only successfully decoded out in relay node, relay node can use traditional QAM or PSK
Method is sent after carrying out coded modulation to the data of the user 1；Alternatively, can also use described in the present embodiment makes destination node
The modulator approach of system performance equilibrium.If relay node decodes any user number in the first multi-user data signal not successfully
According to when, then 0 signal can be transmitted in relay node.Alternatively, if relay node decodes in the first multi-user data signal not successfully
All customer data, can not also send any signal.It can specifically determine according to being actually needed, be not limited thereof herein.
During specific implementation, the internal structure of relay node can have a variety of specific implementation forms.Fig. 4 is shown in which a kind of tool
The structure diagram of body way of realization.As shown in figure 4, the relay node may include：Receiving module, demodulating and decoding module, first
Code modulation module and sending module.
Wherein, receiving module is used to receive the first multi-user data signal after the hierarchical modulation from source node.
Demodulating and decoding module is used to be demodulated decoding to each user data in the first multi-user data signal.
First modulation module is used to be successfully decoded out in the demodulating and decoding module each in the first multi-user data signal
After user data, according to the principle for making the equilibrium of destination node system performance, using the power allocation of parameters pair different from source node
Hierarchical modulation after each user data is encoded, obtains the second multi-user data signal.
Sending module is used to the second multi-user data signal being sent to each destination node.
Corresponding with method shown in Fig. 2, which can further comprise：Second code modulation module, in institute
State demodulating and decoding module and the use modulated in the first multi-user data signal using high power allocation of parameters is only successfully decoded out
During user data, coded modulation is carried out to the user data decoded.Correspondingly, the sending module can be further used for by
The user data signal of the second code modulation module modulation is sent to corresponding destination node.
It is corresponding with method shown in Fig. 2, first code modulation module in the relay node can further use with
Redundancy of the identical or different check bit of source node as the second multi-user data signal.
In the present invention, due to using code domain averaging method, according to making destination node system performance balanced in relay node
Principle, using the power allocation of parameters different from source node to each user data carry out hierarchical modulation so that destination node pair
When the signal from source node and the signal of relay node received merges decoding, system performance can be equalized.And
And by adjusting the power allocation of parameters of relay node, can find makes destination node system performance balanced and makes destination node
The power allocation of parameters of preferable performance is obtained, so as to ensure that the performance of destination node.
In addition, in the case of the data of two users are only included, by making in the power allocation of parameters of relay node
Low-power allocation of parameters can obtain more preferable systematicness higher than the low-power allocation of parameters in the power allocation of parameters of source node
Energy.
In addition, by using redundancy of the check bit different from source node as multi-user data signal, can carry
The error correcting capability of high data.
The scheme average to the code domain in the embodiment of the present invention and the scheme of time domain average of the prior art is below
System performance carries out emulation comparison.
Fig. 5 is based on the Between Signal To Noise Ratio schematic diagram between Fig. 1 example showns base station, relay node and each user terminal.
As shown in figure 5, the signal-to-noise ratio between user terminal 1 and base station is SNR, the signal-to-noise ratio between user terminal 2 and base station is SNR,
Signal-to-noise ratio between relay node and base station is SNR1, the signal-to-noise ratio between user terminal 1 and relay node is SNR21, user's end
Signal-to-noise ratio between end 2 and relay node is SNR22。
Fig. 6 a and Fig. 6 b be each user's received signal to noise ratio it is identical when the embodiment of the present invention in scheme with the prior art
The system performance of the scheme of time domain average compares analogous diagram.In Fig. 6 a and Fig. 6 b using the situation of the data comprising two users as
Example, simulated conditions are：Channel model：Flat fading channel (Flat fadingchannel)；Per frame symbolic number：256 bits；Adjust
Method processed：ssi1And ssi2Modulated (QPSK) using four phase shift keying；Signal-to-noise ratio (SNR) relational expression：SNR1=SNR+10dB,
SNR21=SNR22=SNR+6dB；Power allocation of parameters in this embodiment scheme：Time domain is put down
Power allocation of parameters in equal scheme：(since α takesTaken than αThere is better performance, take herein).Fig. 6 a are comparison analogous diagrams when code check is 1/2；Fig. 6 b are comparison analogous diagrams when code check is 3/4.Fig. 6 a and figure
In 6b, abscissa SNR, ordinate is the BER average values of each user.
As shown in figures 6 a and 6b, in the case where each user's received signal to noise ratio is identical, using in the embodiment of the present invention
Technical solution can reduce signal-to-noise ratio required when reaching same services quality (QoS, Quality of Service), either
The availability of frequency spectrum of higher can be obtained in the case of identical signal-to-noise ratio, i.e., with relatively low BER.
Fig. 7 a and Fig. 7 b are for the scheme in each asynchronous embodiment of the present invention of user's received signal to noise ratio and in the prior art
The system performance of the scheme of time domain average compares analogous diagram.Equally with the situation of the data comprising two users in Fig. 7 a and Fig. 7 b
Exemplified by, simulated conditions are：Channel model：Flat fading channel (Flat fading channel)；Per frame coded bit number：
256；Modulator approach：ssi1And ssi2Modulated (QPSK) using four phase shift keying；Code check：1/2；Work(in this embodiment scheme
Rate allocation of parameters：Power allocation of parameters in time domain average scheme：Fig. 7 a are
Comparison analogous diagram when two SNR between user and relay node are not much different, such as SNR relational expressions：SNR1=SNR+10dB,
SNR21=SNR+6dB, SNR22=SNR+9dB；Fig. 7 b are ratios when two SNR between user and relay node differ larger
Compared with analogous diagram, such as SNR relational expressions：SNR1=SNR+10dB, SNR21=SNR+3dB, SNR22=SNR+9dB.In Fig. 7 a and Fig. 7 b,
Abscissa is SNR, and ordinate is the BER average values of each user.
As shown in figs. 7 a and 7b, in the case of each user's received signal to noise ratio difference, using in the embodiment of the present invention
Technical solution using the average scheme of conventional Time-domain still than having certain advantage, between two users and relay node
When SNR differences are larger, it can also be obtained using the technical solution in the embodiment of the present invention and not be inferior to conventional Time-domain and be averaged the property of scheme
Energy.
It can also receive it that " reception " word in the embodiment of the present invention, which can be understood as actively obtaining from other modules,
The information that his module is sent.
It will be appreciated by those skilled in the art that attached drawing is the schematic diagram of a preferred embodiment, module or stream in attached drawing
Journey is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that the module in device in embodiment can describe be distributed according to embodiment
In the device of embodiment, respective change can also be carried out and be disposed other than in one or more devices of the present embodiment.Above-mentioned reality
The module for applying example can be merged into a module, can also be further split into multiple submodule.
Part steps in the embodiment of the present invention, can utilize software to realize that corresponding software program can be stored in can
In the storage medium of reading, such as CD or hard disk.
Particular embodiments described above, has carried out the purpose of the present invention, technical solution and beneficial effect further in detail
Describe in detail bright, it should be understood that the foregoing is merely illustrative of the preferred embodiments of the present invention, be not intended to limit the guarantor of the present invention
Scope is protected, within the spirit and principles of the invention, any modification, equivalent replacement, improvement and so on, should be included in this
Within the protection domain of invention.
Claims (11)
1. a kind of multi-user data transmission method based on hierarchical modulation, it is characterised in that the multi-user data includes first
The data of user and the data of second user；This method includes：
Relay node receives the first multi-user data signal after the hierarchical modulation from source node；First multi-user data
Signal uses the first power allocation of parameters formed according to the first user with the principle of the first power, the second power of second user
Hierarchical modulation forms；First power is more than the second power；
After each user data in the first multi-user data signal is successfully decoded in relay node, according to making destination node system
The principle of system balancing performance, is classified after being encoded using the second power allocation of parameters different from source node to each user data
Modulation, the second obtained multi-user data signal is sent, first from source node of reception is used by each destination node
User data signal and the second multi-user data signal from relay node are demodulated respectively, and the signal after demodulation is carried out
After merging, decoding obtains corresponding user data；
The second power allocation of parameters is formed according to the first user with the principle of the 3rd power, the 4th power of second user；
3rd power is less than the 4th power.
2. according to the method described in claim 1, it is characterized in that, the first multi-user data signal is：
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<mi>i</mi>
</mrow>
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<mo>=</mo>
<msqrt>
<mrow>
<mn>1</mn>
<mo>-</mo>
<msup>
<mi>&alpha;</mi>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
<msub>
<mi>ss</mi>
<mrow>
<mi>i</mi>
<mn>1</mn>
</mrow>
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<mo>+</mo>
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<mi>&alpha;ss</mi>
<mrow>
<mi>i</mi>
<mn>2</mn>
</mrow>
</msub>
<mo>;</mo>
</mrow>
The second multi-user data signal is：
Wherein, ssi1For i-th of data of modulated first user；ssi2For i-th of data of modulated second user；α, β,For power allocation of parameters, and 0 ＜ α21/2,0 ＜ β of ＜2＜ 1/2, β >=α.
3. method according to claim 1 or 2, it is characterised in that this method further comprises：If relay node is only successful
When decoding the user data modulated in the first multi-user data signal using high power allocation of parameters, relay node only will
Sent after the user data coded modulation decoded.
4. method according to claim 1 or 2, it is characterised in that described to send out the second obtained multi-user data signal
Go out, before, further comprise：The second multi-user data signal is used as using with the identical or different check bit of source node
Redundancy.
A kind of 5. relay node of the multi-user data transmission based on hierarchical modulation, it is characterised in that the multi-user data bag
Include the data of the first user and the data of second user；The relay node includes：
Receiving module, for the first multi-user data signal after hierarchical modulation of the reception from source node；Described first is multi-purpose
User data signal uses the first power point formed according to the first user with the principle of the first power, the second power of second user
Formed with parameter classification modulation；First power is more than the second power；
Demodulating and decoding module, for being demodulated decoding to each user data in the first multi-user data signal；
First code modulation module, after being successfully decoded for each user data in the first multi-user data signal, is pressed
According to the principle for making the equilibrium of destination node system performance, using the second power allocation of parameters different from source node to each user data
Hierarchical modulation after being encoded, obtains the second multi-user data signal；The second power allocation of parameters is used according to the first user
3rd power, second user are formed with the principle of the 4th power；3rd power is less than the 4th power；
Sending module, for the second multi-user data signal to be sent to each destination node.
6. relay node according to claim 5, it is characterised in that the multi-user data includes the data of the first user
With the data of second user；
The first multi-user data signal is：
The second multi-user data signal is：
Wherein, ssi1For i-th of data of modulated first user；ssi2For i-th of data of modulated second user；α, β,For power allocation of parameters, and 0 ＜ α21/2,0 ＜ β of ＜2＜ 1/2, β >=α.
7. the relay node according to claim 5 or 6, it is characterised in that the relay node further comprises：Second coding
Modulation module, high power is utilized for being only successfully decoded out in the first multi-user data signal in the demodulating and decoding module
During the user data of allocation of parameters modulation, modulated after being encoded to the user data decoded；
The sending module is further used for only being sent to the user data signal that second code modulation module is modulated pair
The destination node answered.
8. the relay node according to claim 5 or 6, it is characterised in that first code modulation module further makes
By the use of the redundancy with the identical or different check bit of source node as the second multi-user data signal.
9. a kind of multi-user data Transmission system based on hierarchical modulation, it is characterised in that the multi-user data includes first
The data of user and the data of second user；The system includes：
Source node, for hierarchical modulation after being encoded using the first power allocation of parameters to each user data, will obtain the
One multi-user data signal is sent；The first power allocation of parameters is according to the first user with the first power, second user with
The principle of two power is formed；First power is more than the second power；
Relay node, for receiving the first multi-user data signal from the source node, to the described first multi-purpose amount
It is believed that number in each user data be successfully decoded after, according to the principle for making the equilibrium of destination node system performance, use and source node
Hierarchical modulation after the second different power allocation of parameters encodes each user data, the second obtained multi-user data is believed
Number send；The second power allocation of parameters is according to the first user with the 3rd power, the principle structure of the 4th power of second user
Into；3rd power is less than the 4th power；
Each destination node, for first multi-user data signal of the reception from source node and more than second from relay node
User data signal, is demodulated the first multi-user data signal and the second multi-user data signal respectively, and
After signal after demodulation is merged, decoding obtains corresponding user data.
10. system according to claim 9, it is characterised in that the data of the multi-user data including the first user and
The data of second user；
The first multi-user data signal that the source node obtains is
The second multi-user data signal that the relay node obtains is
Wherein, ssi1For i-th of data of modulated first user；ssi2For i-th of data of modulated second user；α is the first power allocation of parameters, β,For the second power allocation of parameters, and 0 ＜ α21/2,0 ＜ β of ＜2＜ 1/
2, β >=α.
11. a kind of multi-user data transmission method based on hierarchical modulation, it is characterised in that this method includes：
Source node uses what is formed according to the first user with the principle of the first power, the second power of second user at the first moment
First power allocation of parameters carries out hierarchical modulation to the data of two users, and the first obtained multi-user data signal is sent；
First power is more than the second power；
Source node uses what is formed according to the first user with the principle of the 3rd power, the 4th power of second user at the second moment
Second power allocation of parameters carries out hierarchical modulation to described two user data, and the second obtained multi-user data signal is sent out
Go out；3rd power is less than the 4th power；The first multi-user data of reception is believed by the corresponding destination node of two users
Number and the second multi-user data signal be demodulated respectively, and after the signal after demodulation is merged, decoding obtains corresponding
User data.
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