CN106937256A - A kind of cooperation multicast transmission method based on non-orthogonal multiple access technology - Google Patents
A kind of cooperation multicast transmission method based on non-orthogonal multiple access technology Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/30—Resource management for broadcast services
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a kind of cooperation multicast transmission method based on non-orthogonal multiple access technology, its step is：S1, base station construction unicast user Candidate SetS2, base station is from Candidate SetThe middle optimal unicast user d of selectionn*With multicast users while access network；S3, base station sending signal SBST () gives all-multicast user and optimal unicast user dn*；S4, unicast user dn*Receive SBSMulticast users signal S is first decoded after (t)0T (), turns S5 if being successfully decoded, otherwise turn S6；S5, unicast user dn*By successive interference cancellation techniques from SBSS is removed in (t)0T () decodes desired signal S afterwards1T () and retransmitting multi-casting subscriber signal, multicast users merge the signal with the signal received from base station after receiving forward signal, decoding desired signal S0(t)；S6, unicast user dn*(multicast users) are respectively directly from signal SBSItself desired signal S is decoded in (t)1(t)(S0(t)).The present invention can effectively improve the anti-interruption performance of multi-casting communication, for unicast user provides transmission opportunity, lift spectrum efficiency, can be used for multimedia multicast transmission system.
Description
Technical field
The present invention relates to wireless communication field, particularly a kind of cooperation multicast transmission based on non-orthogonal multiple access technology
Method.
Background technology
The development of radio communication service and mobile terminal application brings the blowout of data traffic to increase, and this causes people to frequency
The demand of spectrum resource is increasingly sharpened.Used as novel radio business, wireless multicast transmission make use of the broadcast characteristic of wireless channel, will
There are all users of same requirements to specific resources in transmitting procedure as a multicast group, and identical information is sent to simultaneously
All of multicast users, are a kind of wireless traffics of spectral efficient, can be widely applied to video request program, video conference, many matchmakers
The communication scenes such as body education.
Due to needing while ensureing the transmission quality of multiple users in wireless multicast transmission so that systematic function is generally received
It is limited to the quality of reception of worst channel gain user, letter can be effectively resisted by cooperating relay technology in wireless multicast network
The transmission performance of road decline lifting multicast system.At present, the research for wireless cooperation multicast transmission techniques has been achieved necessarily
Paper and the related ends such as patent.I-H.Lee in 2013 etc. " IEEE Communications Letters " (《International electricity
Gas Electronic Engineering Association communication bulletin》) a kind of optimal multicasting relay selection scheme is proposed, can obtain cooperation multicast system
Maximum diversity gain is obtained, the transmission reliability of system is improved.However, needing the global transient channel of whole system in the program
Status information, system complexity expense high is big, and increasing with system user, and the transmission reliability of system will be deteriorated.
L Yang in 2015 etc. " IEEE Transactions on Vehicular Technology " (《International Electrical electronics work
SCTE's vehicle technology transactions》) in propose based on optimal user forwarding cooperation Multicast Scheme.In this scenario, system
From successfully decoded multicast users, selection optimal user serves as relaying, to decoding failure multicast users forwarding information.The program can
Achieve a perfect score diversity gain, and diversity gain exponent number is equal to multicast users number, shows that the reliability of the program increases with number of users
Grow and improve, and overcome the defect that the reliability of best relay forward collaboration multicast increases and deteriorates with number of users.However,
The multicast users that the node of cooperation is mostly in the relaying of special deployment or network, application are participated in existing cooperation multicasting technology
Flexibility it is relatively low, additionally, consider communication network users common requirement when in view of differentiated user number of individuals
According to transmission demand, be not suitable for being applied in the general network that multicast users and unicast user coexist.
On the other hand, non-orthogonal multiple access technology can greatly improve increasingly in short supply as a kind of information multiple access access means
Usable spectrum resource spectrum utilization efficiency, the technology overlaps multiple information flows in time domain/frequency domain/code domain with different capacity
Channel, be wireless traffic that multiple users provide differentiated demand simultaneously in same wireless resource, can significantly carry
System spectral efficiency high and user's access capability, reduce user scheduling signaling consumption, shorten access delay, reduce terminal energy consumption.
It has obtained being widely recognized as domestic and international industrial quarters as the Core candidate technology that the communication that faces the future, 5G communicate.
The content of the invention
For deficiency present in above-mentioned existing cooperation multicasting technology, and the height brought using orthogonal multiple access technique
Spectrum efficiency and huge application potential, are intended to propose a kind of cooperation multicast transmission based on non-orthogonal multiple access technology
Method, by non-orthogonal multiple access technology, transmission is overlapped by multicast user information and unicast user information in power domain,
The spectrum utilization of network can be greatly promoted during multicast transmission for the unicast user in system provides the chance for accessing
Rate.Meeting the common information requirement of multi-user and individual consumer's demand simultaneously, the diversity gain brought using multi-user is carried
The reliability of multicast users transmission high.
To achieve these goals, the present invention is adopted the following technical scheme that：
Cooperation multicast transmission method based on non-orthogonal multiple access technology, comprising a base station, N number of unicast user and M
Individual multicast users, wherein unicast user carry out data forwarding as cooperating relay assistance base station to multicast users, each time method
Execution at most include 2 transmission time units.
A kind of cooperation multicast transmission method based on non-orthogonal multiple access technology, includes a base station, N in the network
Individual unicast user and M multicast users, wherein unicast user carry out data to multicast users and turn as cooperating relay assistance base station
Hair；Characterized in that, methods described comprises the following steps：
Be arranged as channel gain ascending order between each unicast user and base station by S1, base station | f1|2＜ ... ＜ | fn|2＜ ...
＜ | fN|2, wherein | fn|2N-th channel yield value after ascending order arrangement is represented, base station is according to ranking results and the list of systemic presupposition
Broadcasting user Candidate Set radix q, is candidate's unicast user by the unicast user selection corresponding to q maximum channel yield value, and
Construction unicast user Candidate SetWherein dnFor respective channels gain is | fn|2Unicast
User；
S2, base station is from unicast user Candidate SetOne optimal unicast user d of middle selectionn*Accessed simultaneously with multicast users,
And by unicast user dn*Base station retransmitting multi-casting user profile is assisted as cooperating relay；
S3, base station is by multicast users and unicast user dn*The raw information of demand is processed, construction sending signal SBS
T (), includes multicast users signal S in the signal0(t) and unicast user signal S1(t)；
S4, in unit transmission unit, base station is to unicast user dn*With all-multicast user's broadcast transmission signal SBS(t),
Unicast user dn*Receive signal SBSMulticast users signal S is first decoded after (t)0T (), S5 is gone to if it can be successfully decoded, if
Can not be successfully decoded, go to S6；
S5, unicast user dn*By successive interference cancellation techniques from reception signal SBSMulticast users signal S is removed in (t)0
After (t), itself desired signal S is decoded1(t), in addition unicast user dn*Multicast user information to obtaining carries out recompiling tune
System, unity power signal of the generation comprising multicast user informationAnd turn to all-multicast user in next transmission unit
SignalMulticast users pm, (m ∈ 1 ..., M }) receive forward signalBy the signal and from base station
Signal SBST () is decoded after merging；
S6, unicast user dn*Directly from reception signal SBSItself desired signal S is decoded in (t)1(t), multicast users pmDirectly
Receive signal SBSDecoding multicast users signal S in (t)0(t)。
Further, acquisition of the base station to the channel gain between unicast user and base station, is wide from base station to unicast user
Broadcast training sequence, each unicast user measures the instantaneous channel gain of itself and base station according to training sequence, and by the measurement result
Feed back to base station.
Further, the specific method of step S2 is as follows：
S21, in Candidate SetIn unicast user dnItself is obtained using method described in claim 2 to be used to multicast
Family pm, the channel gain between (m ∈ { 1 ..., M }) | hn,m|2；
S22, in Candidate SetIn unicast user dnBy the respective channel gain for obtaining | hn,m|2Feed back to base station；
S23, for each unicast user dnTo multicast users pmThere is one " minimum channel yield value ", be designated asBase station selects one from the unicast user in all candidate collections has maximum " minimum channel gain
The unicast user d of value "n*Used as optimal unicast user, the process is represented by：
The channel gain of the worst conversion link of unicast user can be realized maximizing by the criterion；
Selection result is broadcast to each unicast user by S24, base station.
Further, the specific method of step S3 is as follows：
S31, base station is respectively to multicast users and unicast user dn*The raw information of demand carries out coded modulation, and construction is corresponding
Unity power signal S0(t) and S1(t)；
S32, base station according to predetermined power allocation proportion, by available transmit power PBSIn signal S0(t) and S1Divide between (t)
Match somebody with somebody, specifically, base station is signal S0T () distribution transmit power is a0PBS, it is signal S1T () distribution transmit power is a1PBS, wherein
a0And a1It is predetermined power distribution factor, and meets a0+a1=1；
S33, base station is by through two Signal averagings after power distribution, generation sending signal SBST () is represented by：
Further, the specific method of step S4 is as follows：
S41, base station sending signal SBST () transmits through wireless channel after, unicast user dn*Reception signalCan represent
For：
Multicast users pmReception signal be：
Wherein,WithUnicast user d is represented respectivelyn*With multicast users pmThe white noise at place, fn*And gmBase is represented respectively
Stand to unicast user dn*With base station to multicast users pmBetween multiple Gauss channel, to fn*And gmModulus of access again square, i.e., | fn*|2
With | gm|2Represent base station to unicast user dn*With base station to multicast users pmBetween channel yield value；
S42, unicast user dn*Decoding multicast users signal, decodes Signal to Interference plus Noise Ratio accordinglyIt is represented by：
S43, when decoding Signal to Interference plus Noise RatioMore than predetermined decoding threshold γthThen judge unicast user dn*Successfully decoded,
Otherwise it is judged as decoding failure.
Further, the specific method of step S5 is as follows：
S51, unicast user dn*After successive interference cancellation techniques remove multicast users signal, new reception signal is obtainedAnd the decoding of itself desired signal is carried out, signal to noise ratio is decoded accordinglyIt is represented by：
S52, unicast user dn*Multicast user information to obtaining recompiles modulation generation comprising multicast user information
Unity power signalAnd with predetermined power PdThe information is forwarded to all-multicast user；
S53, multicast users pmReceive by unicast user dn*The information of forwarding, and by the signal and receive signalCarry out most
Big ratio merges, the Signal to Interference plus Noise Ratio after mergingIt is expressed as：
Further, the specific method of step S6 is as follows：
S61, unicast user dn*Directly from reception signalMiddle decoding desired signal S1(t), Signal to Interference plus Noise Ratio nowTable
It is shown as：
S62, multicast users pmDirectly from reception signalMiddle decoding desired signal S0(t), Signal to Interference plus Noise Ratio nowTable
It is shown as：
The invention has the advantages that：
1. the present invention is introduced into wireless multicast system by by cooperating relay technology, is cooperated by selecting unicast user
Transmission so that multicast users obtain diversity gain and effectively resist channel fading, improves efficiency of transmission and the transmission of multicast network
Reliability；
2. the present invention passes through non-orthogonal multiple access technology by different data message superposed transmissions, in service multicast user
While, incentive action also is provided for it turns into cooperating relay for unicast user provides access chance, compared to traditional
Multicast transmission further improves the utilization rate of frequency spectrum, and each unicast user has also decoded multicast during desired signal is decoded
Subscriber signal, can turn into the natural cooperative node of multicast users, for cooperation multicast provides the bigger free degree；
3. the selection strategy of the cooperation unicast user based on unicast user Candidate Set proposed by the present invention, considers not only many
The transmission quality of broadcasting user, while the structure of Candidate Set can simultaneously ensure that the unicast user of access network also has communication higher to pass
Transmission quality, it is ensured that the transmission fairness of multicast users and unicast user.
Brief description of the drawings
Fig. 1 is the illustraton of model of the cooperation multicast system that the present invention is used；
Fig. 2 realizes general flow chart for of the invention；
Fig. 3 is the performance map that outage probability of the invention changes with system emission power；
Fig. 4 is unicast user and multicast users diversity gain trade-off relation figure in the present invention.
Specific embodiment
Below with reference to accompanying drawing, the invention will be further described, it is necessary to explanation, the present embodiment is with this technology side
Premised on case, detailed implementation method and specific operating process is given, but protection scope of the present invention is not limited to this reality
Apply example.
As shown in figure 1, wireless multicast network used in the present invention, comprising a base station, N number of unicast user and M are individual more
Broadcasting user, wherein unicast user assist the base station to multicast users to carry out data forwarding as cooperating relay, and method is held each time
Row at most includes 2 transmission time units.
As shown in Fig. 2 of the invention realize that step is as follows：
A kind of cooperation multicast transmission method based on non-orthogonal multiple access technology, includes a base station, N in the network
Individual unicast user and M multicast users, wherein unicast user carry out data to multicast users and turn as cooperating relay assistance base station
Hair；Characterized in that, methods described comprises the following steps：
Be arranged as channel gain ascending order between each unicast user and base station by S1, base station | f1|2＜ ... ＜ | fn|2＜ ...
＜ | fN|2, wherein | fn|2N-th channel yield value after ascending order arrangement is represented, base station is according to ranking results and the list of systemic presupposition
Broadcasting user Candidate Set radix q, is candidate's unicast user by the unicast user selection corresponding to q maximum channel yield value, and
Construction unicast user Candidate SetWherein dnFor respective channels gain is | fn|2Unicast
User；
S2, base station is from unicast user Candidate SetOne optimal unicast user d of middle selectionn*Accessed simultaneously with multicast users,
And by unicast user dn*Base station retransmitting multi-casting user profile is assisted as cooperating relay；
S3, base station is by multicast users and unicast user dn*The raw information of demand is processed, construction sending signal SBS
T (), includes multicast users signal S in the signal0(t) and unicast user signal S1(t)；
S4, in unit transmission unit, base station is to unicast user dn*With all-multicast user's broadcast transmission signal SBS(t),
Unicast user dn*Receive signal SBSMulticast users signal S is first decoded after (t)0T (), S5 is gone to if it can be successfully decoded, if
Can not be successfully decoded, go to S6；
S5, unicast user dn*By successive interference cancellation techniques from reception signal SBSMulticast users signal S is removed in (t)0
After (t), itself desired signal S is decoded1(t), in addition unicast user dn*Multicast user information to obtaining carries out recompiling tune
System, unity power signal of the generation comprising multicast user informationAnd turn to all-multicast user in next transmission unit
SignalMulticast users pm, (m ∈ 1 ..., M }) receive forward signalBy the signal and from base station
Signal SBST () is decoded after merging；
S6, unicast user dn*Directly from reception signal SBSItself desired signal S is decoded in (t)1(t), multicast users pmDirectly
Receive signal SBSDecoding multicast users signal S in (t)0(t)。
In the present embodiment, acquisition of the base station to the channel gain between unicast user and base station, is to unicast user from base station
Broadcast training sequence, each unicast user measures the instantaneous channel gain of itself and base station according to training sequence, and by the measurement knot
Fruit feeds back to base station.
In the present embodiment, the specific method of step S2 is as follows：
S21, in Candidate SetIn unicast user dnItself is obtained using method described in claim 2 to be used to multicast
Family pm, the channel gain between (m ∈ { 1 ..., M }) | hn,m|2；
S22, in Candidate SetIn unicast user dnBy the respective channel gain for obtaining | hn,m|2Feed back to base station；
S23, for each unicast user dnTo multicast users pmThere is one " minimum channel yield value ", be designated asBase station selects one from the unicast user in all candidate collections has maximum " minimum channel gain
The unicast user d of value "n*Used as optimal unicast user, the process is represented by：
The channel gain of the worst conversion link of unicast user can be realized maximizing by the criterion；
Selection result is broadcast to each unicast user by S24, base station.
In the present embodiment, the specific method of step S3 is as follows：
S31, base station is respectively to multicast users and unicast user dn*The raw information of demand carries out coded modulation, and construction is corresponding
Unity power signal S0(t) and S1(t)；
S32, base station according to predetermined power allocation proportion, by available transmit power PBSIn signal S0(t) and S1Divide between (t)
Match somebody with somebody, specifically, base station is signal S0T () distribution transmit power is a0PBS, it is signal S1T () distribution transmit power is a1PBS, wherein
a0And a1It is predetermined power distribution factor, and meets a0+a1=1；
S33, base station is by through two Signal averagings after power distribution, generation sending signal SBST () is represented by：
In the present embodiment, the specific method of step S4 is as follows：
S41, base station sending signal SBST () transmits through wireless channel after, unicast user dn*Reception signalCan represent
For：
Multicast users pmReception signal be：
Wherein,WithUnicast user d is represented respectivelyn*With multicast users pmThe white noise at place, fn*And gmBase is represented respectively
Stand to unicast user dn*With base station to multicast users pmBetween multiple Gauss channel, to fn*And gmModulus of access again square, i.e., | fn*|2
With | gm|2Represent base station to unicast user dn*With base station to multicast users pmBetween channel yield value；
S42, unicast user dn*Decoding multicast users signal, decodes Signal to Interference plus Noise Ratio accordinglyIt is represented by：
S43, when decoding Signal to Interference plus Noise RatioMore than predetermined decoding threshold γthThen judge unicast user dn*Successfully decoded,
Otherwise it is judged as decoding failure.
In the present embodiment, the specific method of step S5 is as follows：
S51, unicast user dn*After successive interference cancellation techniques remove multicast users signal, new reception signal is obtainedAnd the decoding of itself desired signal is carried out, signal to noise ratio is decoded accordinglyIt is represented by：
S52, unicast user dn*Multicast user information to obtaining recompiles modulation generation comprising multicast user information
Unity power signalAnd with predetermined power PdThe information is forwarded to all-multicast user；
S53, multicast users pmReceive by unicast user dn*The information of forwarding, and by the signal and receive signalCarry out most
Big ratio merges, the Signal to Interference plus Noise Ratio after mergingIt is expressed as：
In the present embodiment, the specific method of step S6 is as follows：
S61, unicast user dn*Directly from reception signalMiddle decoding desired signal S1(t), Signal to Interference plus Noise Ratio nowTable
It is shown as：
S62, multicast users pmDirectly from reception signalMiddle decoding desired signal S0(t), Signal to Interference plus Noise Ratio nowTable
It is shown as：
Performance of the invention is further described below with reference to emulation experiment.
Fig. 3 gives the performance map that outage probability of the invention changes with system emission power.It can be seen that with
The lifting of system emission power, the outage probability of system is also decreased.Compared to, without cooperation transmission, the present invention can with tradition
Lower outage probability is realized, with transmission reliability higher.
Fig. 4 gives unicast user and multicast users diversity gain trade-off relation curve.As can be seen from Figure, unicast user and
There is certain interaction relationship in the performance of multicast users, unicast can be adjusted according to the actual index of system in actual transmissions
The size of user's Candidate Set radix q, so that multicast users and unicast user are satisfied by the transmission reliability demand parameter of itself.
For a person skilled in the art, technical scheme that can be according to more than and design, make various corresponding
Change and deform, and all these changes and deformation should be construed as being included within the protection domain of the claims in the present invention.
Claims (7)
1. a kind of cooperation multicast transmission method based on non-orthogonal multiple access technology, includes a base station in the network, N number of
Unicast user and M multicast users, wherein unicast user carry out data forwarding as cooperating relay assistance base station to multicast users；
Characterized in that, methods described comprises the following steps：
Be arranged as channel gain ascending order between each unicast user and base station by S1, base station | f1|2＜ ... ＜ | fn|2＜ ... ＜ | fN
|2, wherein | fn|2N-th channel yield value after ascending order arrangement is represented, base station is according to ranking results and the unicast user of systemic presupposition
Candidate Set radix q, is candidate's unicast user by the unicast user selection corresponding to q maximum channel yield value, and construct list
Broadcasting user Candidate SetWherein dnFor respective channels gain is | fn|2Unicast user；
S2, base station is from unicast user Candidate SetOne optimal unicast user d of middle selectionn*Accessed simultaneously with multicast users, and by this
Unicast user dn*Base station retransmitting multi-casting user profile is assisted as cooperating relay；
S3, base station is by multicast users and unicast user dn*The raw information of demand is processed, construction sending signal SBST (), should
Multicast users signal S is included in signal0(t) and unicast user signal S1(t)；
S4, in unit transmission unit, base station is to unicast user dn*With all-multicast user's broadcast transmission signal SBS(t), unicast
User dn*Receive signal SBSMulticast users signal S is first decoded after (t)0T (), S5 is gone to if it can be successfully decoded, if can not
It is successfully decoded, goes to S6；
S5, unicast user dn*By successive interference cancellation techniques from reception signal SBSMulticast users signal S is removed in (t)0(t)
Afterwards, itself desired signal S is decoded1(t), in addition unicast user dn*Multicast user information to obtaining carries out recompiling modulation,
Unity power signal of the generation comprising multicast user informationAnd forwarded to all-multicast user in next transmission unit
SignalMulticast users pm, (m ∈ 1 ..., M }) receive forward signalBy the signal and the letter from base station
Number SBST () is decoded after merging；
S6, unicast user dn*Directly from reception signal SBSItself desired signal S is decoded in (t)1(t), multicast users pmDirectly connect
Collection of letters SBSDecoding multicast users signal S in (t)0(t)。
2. the cooperation multicast transmission method based on non-orthogonal multiple access technology according to claim 1, it is characterised in that
Acquisition of the base station to the channel gain between unicast user and base station, is to broadcast training sequence, each unicast from base station to unicast user
User measures the instantaneous channel gain of itself and base station according to training sequence, and by the measurement feedback to base station.
3. the cooperation multicast transmission method based on non-orthogonal multiple access technology according to claim 1, it is characterised in that
The specific method of step S2 is as follows：
S21, in Candidate SetIn unicast user dnItself is obtained to multicast users p using method described in claim 2m,
Channel gain between (m ∈ { 1 ..., M }) | hn,m|2；
S22, in Candidate SetIn unicast user dnBy the respective channel gain for obtaining | hn,m|2Feed back to base station；
S23, for each unicast user dnTo multicast users pmThere is one " minimum channel yield value ", be designated asBase station selects one from the unicast user in all candidate collections has maximum " minimum channel gain
The unicast user d of value "n*Used as optimal unicast user, the process is represented by：
The channel gain of the worst conversion link of unicast user can be realized maximizing by the criterion；
Selection result is broadcast to each unicast user by S24, base station.
4. the cooperation multicast transmission method based on non-orthogonal multiple access technology according to claim 1, it is characterised in that
The specific method of step S3 is as follows：
S31, base station is respectively to multicast users and unicast user dn* the raw information of demand carries out coded modulation, and construction is corresponding single
Position power signal S0(t) and S1(t)；
S32, base station according to predetermined power allocation proportion, by available transmit power PBSIn signal S0(t) and S1Distributed between (t), tool
Body ground, base station is signal S0T () distribution transmit power is a0PBS, it is signal S1T () distribution transmit power is a1PBS, wherein a0With
a1It is predetermined power distribution factor, and meets a0+a1=1；
S33, base station is by through two Signal averagings after power distribution, generation sending signal SBST () is represented by：
5. the cooperation multicast transmission method based on non-orthogonal multiple access technology according to claim 1, it is characterised in that
The specific method of step S4 is as follows：
S41, base station sending signal SBST () transmits through wireless channel after, unicast user dn* reception signalIt is represented by：
Multicast users pmReception signal be：
Wherein,WithUnicast user d is represented respectivelyn* with multicast users pm at white noise, fn* represent that base station is arrived respectively with gm
Unicast user dn* with base station to multicast users pmBetween multiple Gauss channel, to fn*And gmModulus of access again square, i.e., | fn*|2With |
gm|2Represent base station to unicast user dn*With base station to multicast users pmBetween channel yield value；
S42, unicast user dn*Decoding multicast users signal, decodes Signal to Interference plus Noise Ratio accordinglyIt is represented by：
S43, when decoding Signal to Interference plus Noise RatioMore than predetermined decoding threshold γthThen judge unicast user dn*Successfully decoded, otherwise sentences
Break as decoding fails.
6. the cooperation multicast transmission method based on non-orthogonal multiple access technology according to claim 1, it is characterised in that
The specific method of step S5 is as follows：
S51, unicast user dn*After successive interference cancellation techniques remove multicast users signal, new reception signal is obtainedAnd the decoding of itself desired signal is carried out, signal to noise ratio is decoded accordinglyIt is represented by：
S52, unicast user dn*Multicast user information to obtaining recompiles modulation unit of the generation comprising multicast user information
Power signalAnd with predetermined power PdThe information is forwarded to all-multicast user；
S53, multicast users pmReceive by unicast user dn*The information of forwarding, and by the signal and receive signalCarry out high specific
Merge, the Signal to Interference plus Noise Ratio after mergingIt is expressed as：
。
7. the cooperation multicast transmission method based on non-orthogonal multiple access technology according to claim 1, it is characterised in that
The specific method of step S6 is as follows：
S61, unicast user dn*Directly from reception signalMiddle decoding desired signal S1(t), Signal to Interference plus Noise Ratio nowRepresent
For：
S62, multicast users pmDirectly from reception signalMiddle decoding desired signal S0(t), Signal to Interference plus Noise Ratio nowIt is expressed as：
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