CN106937256B - 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 PDF

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CN106937256B
CN106937256B CN201710019586.XA CN201710019586A CN106937256B CN 106937256 B CN106937256 B CN 106937256B CN 201710019586 A CN201710019586 A CN 201710019586A CN 106937256 B CN106937256 B CN 106937256B
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signal
base station
multicast
unicast user
user
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CN106937256A (en
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杨龙
陈健
贺冰涛
吕璐
阔永红
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Xi'an Xutong Electronic Technology Corp
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Xian University of Electronic Science and Technology
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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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of cooperation multicast transmission methods based on non-orthogonal multiple access technology, the steps include: S1, and base station constructs unicast user Candidate SetS2, base station is from Candidate SetThe middle optimal unicast user d of selectionn*Network is accessed simultaneously with multicast users；S3, base station send signal SBS(t) all-multicast user and optimal unicast user d are givenn*；S4, unicast user dn*Receive SBS(t) multicast users signal S is first decoded after0(t), turn S5 if being successfully decoded, otherwise turn S6；S5, unicast user dn*By successive interference cancellation techniques from SBS(t) S is removed in0(t) desired signal S is decoded afterwards1(t) and retransmitting multi-casting subscriber signal, multicast users merge the signal with from base station received signal after receiving forward signal, decode desired signal S0(t)；S6, unicast user dn*(multicast users) are respectively directly from signal SBS(t) itself desired signal S is decoded in1(t)(S0(t)).The present invention can effectively improve the anti-interruption performance of multi-casting communication, provide transmission opportunity for unicast user, promote spectrum efficiency, can be used for multimedia multicast transmission system.

Description

A kind of cooperation multicast transmission method based on non-orthogonal multiple access technology
Technical field
The present invention relates to wireless communication field, especially a kind of cooperation multicast transmission based on non-orthogonal multiple access technology Method.
Background technique
The development of radio communication service and mobile terminal application brings the blowout of data traffic to increase, this makes people to frequency The demand of spectrum resource is increasingly sharpened.As novel radio business, wireless multicast transmits the broadcast characteristic that wireless channel is utilized, will There are all users of same requirements to be sent to simultaneously as a multicast group, and by identical information specific resources in transmission process All multicast users are a kind of wireless traffics of spectral efficient, can be widely applied to video on demand, video conference, more matchmakers The communication scenes such as body education.
Due to needing while guaranteeing the transmission quality of multiple users in wireless multicast transmission so that system performance usually by It is limited to the quality of reception of worst channel gain user, letter can be effectively fought by cooperating relay technology in wireless multicast network Road decline promotes the transmission performance of multicast system.Currently, the research for wireless cooperation multicast transmission techniques has achieved centainly Paper and the related ends such as patent.I-H.Lee in 2013 etc. is in " IEEE Communications Letters " (" international electricity Gas Electronic Engineering Association communicates flash report ") a kind of optimal multicasting relay selection scheme is proposed, cooperation multicast system can be made to obtain 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, the high expense of system complexity is big, and increasing with system user, and the transmission reliability of system will be deteriorated. In L Yang in 2015 etc. in " IEEE Transactions on Vehicular Technology " (" International Electrical electronics work Association of Engineers vehicle technology transactions ") in propose based on optimal user forwarding cooperation Multicast Scheme.In this scenario, system From successfully decoded multicast users, optimal user is selected to serve as relaying, to decoding failure multicast users forwarding information.The program can Achieve a perfect score diversity gain, and diversity gain order is equal to multicast users number, shows that the reliability of the program increases with number of users Reliability that is long and improving, and overcome best relay forward collaboration multicast increases with number of users and the defect of deterioration.However, The node for participating in cooperating in existing cooperation multicasting technology is mostly the multicast users in the relaying or network specially disposed, application Flexibility it is lower, in addition, not considering the number of individuals of differentiated user when considering the common requirement of communication network users According to transmission demand, be not suitable in the general network coexisted applied to multicast users and unicast user.
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, which is overlapped multiple information flows in time domain/frequency domain/code domain with different capacity Channel, be multiple users in same wireless resource while the wireless traffic of differentiated demand being provided, can significantly mention High system spectral efficiency and user's access capability reduce user's dispatch expense, shorten access delay, reduce terminal energy consumption. It has obtained being widely recognized as domestic and international industry as the communication that faces the future, 5G the Core candidate technology communicated.
Summary of the invention
For deficiency present in above-mentioned existing cooperation multicasting technology, and utilize height brought by orthogonal multiple access technique Spectrum efficiency and huge application potential are intended to and propose a kind of cooperation multicast transmission based on non-orthogonal multiple access technology Multicast user information and unicast user information are overlapped transmission in power domain by non-orthogonal multiple access technology by method, The chance of access can be provided for the unicast user in system during multicast transmission, greatly promote the spectrum utilization of network Rate.Meeting the common information requirement of multi-user and individual consumer's demand simultaneously, using diversity gain brought by multi-user, is mentioning The reliability of high multicast users transmission.
To achieve the goals above, the present invention adopts the following technical scheme that:
Cooperation multicast transmission method based on non-orthogonal multiple access technology includes a base station, N number of unicast user and M A multicast users, wherein unicast user assists base station to carry out data forwarding to multicast users as cooperating relay, 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 A unicast user and M multicast users, wherein unicast user assists base station to carry out data turn to multicast users as cooperating relay Hair；It is characterized in that, described method includes following steps:
Channel gain ascending order between each unicast user and base station is arranged as by S1, base station | f1|2< ... < | fn|2< ... < | fN|2, wherein | fn|2Indicate n-th of channel yield value after ascending order arrangement, base station is according to the lists of ranking results and systemic presupposition Unicast user corresponding to maximum q channel yield value is selected as candidate unicast user by broadcasting user Candidate Set radix q, and Construct unicast user Candidate SetWherein dnIt is for respective channels gain | fn|2Unicast User；
S2, base station is from unicast user Candidate SetOne optimal unicast user d of middle selectionn*It is accessed simultaneously with multicast users, And by unicast user dn*Base station retransmitting multi-casting user information is assisted as cooperating relay；
S3, base station is by multicast users and unicast user dn*The raw information of demand is handled, and construction sends signal SBS It (t), include 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 SBS(t) multicast users signal S is first decoded after0(t), S5 is gone to if it can be successfully decoded, if It cannot be successfully decoded, go to S6；
S5, unicast user dn*By successive interference cancellation techniques from receive signal SBS(t) multicast users signal S is removed in0 (t) after, itself desired signal S is decoded1(t), furthermore unicast user dn*The multicast user information of acquisition is carried out recompiling tune System generates the unity power signal comprising multicast user informationAnd turn in next transmission unit to all-multicast user It signalsMulticast users pm, (m ∈ 1 ..., M }) receive forward signalBy the signal and from base station Signal SBS(t) it is decoded after merging；
S6, unicast user dn*Directly from reception signal SBS(t) itself desired signal S is decoded in1(t), multicast users pmDirectly Receive signal SBS(t) multicast users signal S is decoded in0(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 is as follows by step S2:
S21 is in Candidate SetIn unicast user dnItself is obtained using method described in claim 2 to use to multicast Family pm, channel gain between (m ∈ { 1 ..., M }) | hn,m|2；
S22 is in Candidate SetIn unicast user dnThe channel gain that will respectively obtain | hn,m|2Feed back to base station；
S23, for each unicast user dnTo multicast users pmThere is one " the smallest channel yield value ", is denoted asBase station selects one from the unicast user in all candidate collections has maximum " the smallest channel gain The unicast user d of value "n*As best unicast user, which be may be expressed as:
The channel gain for maximizing the worst conversion link of unicast user can be realized by the criterion；
Selection result is broadcast to each unicast user by S24, base station.
Further, the specific method is as follows by step S3:
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 is according to predetermined power allocation proportion, by available transmission power PBSIn signal S0(t) and S1(t) divide between Match, specifically, base station is signal S0(t) it is a that distribution, which sends power,0PBS, it is signal S1(t) it is a that distribution, which sends power,1PBS, wherein a0And a1For predetermined power distribution factor, and meet a0+a1=1；
Two Signal averagings after power distribution are generated and send signal S by S33, base stationBS(t) it may be expressed as:
Further, the specific method is as follows by step S4:
S41, base station send signal SBS(t) after wireless channel transmits, unicast user dn*Reception signalIt can indicate Are as follows:
Multicast users pmReception signal are as follows:
Wherein,WithRespectively indicate unicast user dn*With multicast users pmThe white noise at place, fn*And gmRespectively indicate base It stands to unicast user dn*With base station to multicast users pmBetween multiple Gauss channel, to fn*And gmModulus value again square, i.e., | fn*|2 With | gm|2Indicate base station to unicast user dn*With base station to multicast users pmBetween channel yield value；
S42, unicast user dn*Multicast users signal is decoded, decodes Signal to Interference plus Noise Ratio accordinglyIt may be expressed as:
S43, when decoding Signal to Interference plus Noise RatioGreater than scheduled decoding threshold γthThen judge unicast user dn*Successfully decoded, Otherwise it is judged as decoding failure.
Further, the specific method is as follows by step S5:
S51, unicast user dn*After removing multicast users signal by successive interference cancellation techniques, new reception signal is obtainedAnd the decoding of itself desired signal is carried out, signal-to-noise ratio is decoded accordinglyIt may be expressed as:
S52, unicast user dn*Modulation is recompiled to the multicast user information of acquisition to generate comprising multicast user information Unity power signalAnd with predetermined power PdThe information is forwarded to all-multicast user；
S53, multicast users pmIt receives by unicast user dn*The information of forwarding, and by the signal and receive signalIt carries out most Big ratio merges, the Signal to Interference plus Noise Ratio after mergingIt indicates are as follows:
Further, the specific method is as follows by step S6:
S61, unicast user dn*Directly from reception signalMiddle decoding desired signal S1(t), Signal to Interference plus Noise Ratio at this time It indicates are as follows:
S62, multicast users pmDirectly from reception signalMiddle decoding desired signal S0(t), Signal to Interference plus Noise Ratio at this timeTable It is shown as:
The present invention has the advantage that
1. the present invention is by the way that cooperating relay technology to be introduced into wireless multicast system, by selecting unicast user to cooperate Transmission improves the efficiency of transmission and transmission of multicast network so that multicast users obtain diversity gain and effectively fight channel fading Reliability；
2. the present invention passes through non-orthogonal multiple access technology by different data information superposed transmissions, in service multicast user While, access chance is provided for unicast user and also provides incentive action as cooperating relay for it, compared to traditional Multicast transmission further improves the utilization rate of frequency spectrum, and each unicast user has also decoded multicast during decoding desired signal Subscriber signal can become the natural cooperative node of multicast users, provide bigger freedom degree for cooperation multicast；
3. the selection strategy of the cooperation unicast user proposed by the present invention based on unicast user Candidate Set, considers not only more The transmission quality of broadcasting user, while the building of Candidate Set can guarantee that the unicast user for accessing network also has higher communication to pass simultaneously Transmission quality ensure that the transmission fairness of multicast users and unicast user.
Detailed description of the invention
Fig. 1 is the illustraton of model for the cooperation multicast system that the present invention uses；
Fig. 2 is realization general flow chart 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 attached drawing, the invention will be further described, it should be noted that the present embodiment is with this technology side Premised on case, the detailed implementation method and specific operation process are 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, includes a base station, N number of unicast user and M are a more Broadcasting user, wherein unicast user assists base station to carry out data forwarding to multicast users as cooperating relay, and method is held each time Row at most includes 2 transmission time units.
As shown in Fig. 2, steps are as follows for realization of the invention:
A kind of cooperation multicast transmission method based on non-orthogonal multiple access technology includes a base station, N in the network A unicast user and M multicast users, wherein unicast user assists base station to carry out data turn to multicast users as cooperating relay Hair；It is characterized in that, described method includes following steps:
Channel gain ascending order between each unicast user and base station is arranged as by S1, base station | f1|2< ... < | fn|2< ... < | fN|2, wherein | fn|2Indicate n-th of channel yield value after ascending order arrangement, base station is according to the lists of ranking results and systemic presupposition Unicast user corresponding to maximum q channel yield value is selected as candidate unicast user by broadcasting user Candidate Set radix q, and Construct unicast user Candidate SetWherein dnIt is for respective channels gain | fn|2Unicast User；
S2, base station is from unicast user Candidate SetOne optimal unicast user d of middle selectionn*It is accessed simultaneously with multicast users, And by unicast user dn*Base station retransmitting multi-casting user information is assisted as cooperating relay；
S3, base station is by multicast users and unicast user dn*The raw information of demand is handled, and construction sends signal SBS It (t), include 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 SBS(t) multicast users signal S is first decoded after0(t), S5 is gone to if it can be successfully decoded, if It cannot be successfully decoded, go to S6；
S5, unicast user dn*By successive interference cancellation techniques from receive signal SBS(t) multicast users signal S is removed in0 (t) after, itself desired signal S is decoded1(t), furthermore unicast user dn*The multicast user information of acquisition is carried out recompiling tune System generates the unity power signal comprising multicast user informationAnd turn in next transmission unit to all-multicast user It signalsMulticast users pm, (m ∈ 1 ..., M }) receive forward signalBy the signal and come from base station Signal SBS(t) it is decoded after merging；
S6, unicast user dn*Directly from reception signal SBS(t) itself desired signal S is decoded in1(t), multicast users pmDirectly Receive signal SBS(t) multicast users signal S is decoded in0(t)。
In the present embodiment, acquisition of the base station to the channel gain between unicast user and base station is from base station to unicast user Training sequence is broadcasted, each unicast user measures the instantaneous channel gain of itself and base station according to training sequence, and the measurement is tied Fruit feeds back to base station.
In the present embodiment, the specific method is as follows by step S2:
S21 is in Candidate SetIn unicast user dnItself is obtained using method described in claim 2 to use to multicast Family pm, channel gain between (m ∈ { 1 ..., M }) | hn,m|2；
S22 is in Candidate SetIn unicast user dnThe channel gain that will respectively obtain | hn,m|2Feed back to base station；
S23, for each unicast user dnTo multicast users pmThere is one " the smallest channel yield value ", is denoted asBase station selects one from the unicast user in all candidate collections has maximum " the smallest channel gain The unicast user d of value "n*As best unicast user, which be may be expressed as:
The channel gain for maximizing the worst conversion link of unicast user can be realized by the criterion；
Selection result is broadcast to each unicast user by S24, base station.
In the present embodiment, the specific method is as follows by step S3:
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 is according to predetermined power allocation proportion, by available transmission power PBSIn signal S0(t) and S1(t) divide between Match, specifically, base station is signal S0(t) it is a that distribution, which sends power,0PBS, it is signal S1(t) it is a that distribution, which sends power,1PBS, wherein a0And a1For predetermined power distribution factor, and meet a0+a1=1；
Two Signal averagings after power distribution are generated and send signal S by S33, base stationBS(t) it may be expressed as:
In the present embodiment, the specific method is as follows by step S4:
S41, base station send signal SBS(t) after wireless channel transmits, unicast user dn*Reception signalIt can indicate Are as follows:
Multicast users pmReception signal are as follows:
Wherein,WithRespectively indicate unicast user dn*With multicast users pmThe white noise at place, fn*And gmRespectively indicate base It stands to unicast user dn*With base station to multicast users pmBetween multiple Gauss channel, to fn*And gmModulus value again square, i.e., | fn*|2 With | gm|2Indicate base station to unicast user dn*With base station to multicast users pmBetween channel yield value；
S42, unicast user dn*Multicast users signal is decoded, decodes Signal to Interference plus Noise Ratio accordinglyIt may be expressed as:
S43, when decoding Signal to Interference plus Noise RatioGreater than scheduled decoding threshold γthThen judge unicast user dn*Successfully decoded, Otherwise it is judged as decoding failure.
In the present embodiment, the specific method is as follows by step S5:
S51, unicast user dn*After removing multicast users signal by successive interference cancellation techniques, new reception signal is obtainedAnd the decoding of itself desired signal is carried out, signal-to-noise ratio is decoded accordinglyIt may be expressed as:
S52, unicast user dn*Modulation is recompiled to the multicast user information of acquisition to generate comprising multicast user information Unity power signalAnd with predetermined power PdThe information is forwarded to all-multicast user；
S53, multicast users pmIt receives by unicast user dn*The information of forwarding, and by the signal and receive signalIt carries out most Big ratio merges, the Signal to Interference plus Noise Ratio after mergingIt indicates are as follows:
In the present embodiment, the specific method is as follows by step S6:
S61, unicast user dn*Directly from reception signalMiddle decoding desired signal S1(t), Signal to Interference plus Noise Ratio at this time It indicates are as follows:
S62, multicast users pmDirectly from reception signalMiddle decoding desired signal S0(t), Signal to Interference plus Noise Ratio at this timeTable 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 from the figure that with The promotion of system emission power, the outage probability of system also decrease.Compared to, without cooperation transmission, the present invention can with tradition Realize lower outage probability, transmission reliability with higher.
Fig. 4 gives unicast user and multicast users diversity gain trade-off relation curve.As can be seen from Figure, unicast user and The performance of multicast users can adjust unicast according to the actual index of system in actual transmissions there are certain interaction relationship The size of user's Candidate Set radix q, so that multicast users and unicast user be made to be all satisfied itself transmission reliability demand parameter.
For those skilled in the art, it can be made various corresponding according to above technical solution and design Change and modification, and all these change and modification should be construed as being included within the scope of protection of the claims of the present invention.

Claims (5)

  1. Include a base station 1. a kind of cooperation multicast transmission method based on non-orthogonal multiple access technology, N number of unicast user and M multicast users, wherein unicast user assists base station to carry out data forwarding to multicast users as cooperating relay；Its feature exists In described method includes following steps:
    Channel gain ascending order between each unicast user and base station is arranged as by S1, base station | f1|2< ... < | fn|2< ... < | fN |2, wherein | fn|2Indicate n-th of channel yield value after ascending order arrangement, base station is according to the unicast users of ranking results and systemic presupposition Unicast user corresponding to maximum q channel yield value is selected as candidate unicast user, and constructs list by Candidate Set radix q Broadcasting user Candidate SetWherein dnIt is for respective channels gain | fn|2Unicast user；
    S2, base station is from unicast user Candidate SetOne optimal unicast user of middle selectionIt is accessed simultaneously with multicast users, and by The unicast userBase station retransmitting multi-casting user information is assisted as cooperating relay；
    S21 is in Candidate SetIn unicast user dnUsing base station to the acquisition side of the channel gain between unicast user and base station Method obtains itself to multicast users pm, channel gain between (m ∈ { 1 ..., M }) | hn,m|2；
    S22 is in Candidate SetIn unicast user dnThe channel gain that will respectively obtain | hn,m|2Feed back to base station；
    S23, for each unicast user dnTo multicast users pmThere is one " the smallest channel yield value ", is denoted asBase station selects one from the unicast user in all candidate collections has maximum " the smallest channel gain The unicast user of value "As best unicast user, which be may be expressed as:
    The channel gain for maximizing the worst conversion link of unicast user can be realized by the criterion；For best unicast userWith multicast users pmBetween channel parameter；
    Selection result is broadcast to each unicast user by S24, base station；
    S3, base station is by multicast users and unicast userThe raw information of demand is handled, and construction sends signal SBS(t), should It include multicast users signal S in signal0(t) and unicast user signal S1(t)；
    S31, base station is respectively to multicast users and unicast userThe raw information of demand carries out coded modulation, constructs corresponding single Position power signal S0(t) and S1(t)；
    S32, base station is according to predetermined power allocation proportion, by available transmission power PBSIn signal S0(t) and S1(t) it distributes, has between Body, base station is signal S0(t) it is a that distribution, which sends power,0PBS, it is signal S1(t) it is a that distribution, which sends power,1PBS, wherein a0With a1For predetermined power distribution factor, and meet a0+a1=1；
    Two Signal averagings after power distribution are generated and send signal S by S33, base stationBS(t) it may be expressed as:
    S4, in unit transmission unit, base station is to unicast userWith all-multicast user's broadcast transmission signal SBS(t), unicast UserMulticast users signal S is first decoded after receiving signal a0(t), S5 is gone to if it can be successfully decoded, if cannot succeed Decoding then goes to S6；
    S5, unicast userBy successive interference cancellation techniques from receive signal SBS(t) multicast users signal S is removed in0(t) Afterwards, itself desired signal S is decoded1(t), furthermore unicast userThe multicast user information of acquisition is carried out recompiling modulation, Generate the unity power signal comprising multicast user informationAnd it forwards and believes to all-multicast user in next transmission unit NumberMulticast users pm, (m ∈ 1 ..., M }) receive forward signalBy the signal and from the signal of base station SBS(t) it is decoded after merging；
    S6, unicast userDirectly from reception signal SBS(t) itself desired signal S is decoded in1(t), multicast users pmDirectly connect Collection of letters SBS(t) multicast users signal S is decoded in0(t)。
  2. 2. the cooperation multicast transmission method according to claim 1 based on non-orthogonal multiple access technology, which is characterized 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. 3. the cooperation multicast transmission method according to claim 1 based on non-orthogonal multiple access technology, which is characterized in that The specific method is as follows by step S4:
    S41, base station send signal SBS(t) after wireless channel transmits, unicast userReception signalIt may be expressed as:
    Multicast users pmReception signal are as follows:
    Wherein, available transmission power PBS,WithRespectively indicate unicast userWith multicast users pmThe white noise at place, And gmBase station is respectively indicated to unicast userWith base station to multicast users pmBetween multiple Gauss channel, it is rightAnd gmModulus value Again square, i.e.,With | gm|2Indicate base station to unicast userWith base station to multicast users pmBetween channel yield value；
    S42, unicast userMulticast users signal is decoded, decodes Signal to Interference plus Noise Ratio accordinglyIt may be expressed as:
    S43, when decoding Signal to Interference plus Noise RatioGreater than scheduled decoding threshold γthThen judge unicast userSuccessfully decoded, otherwise It is judged as decoding failure.
  4. 4. the cooperation multicast transmission method according to claim 1 based on non-orthogonal multiple access technology, which is characterized in that The specific method is as follows by step S5:
    S51, unicast userAfter removing multicast users signal by successive interference cancellation techniques, new reception signal is obtainedAnd the decoding of itself desired signal is carried out, signal-to-noise ratio is decoded accordinglyIt may be expressed as:
    Wherein,And gmBase station is respectively indicated to unicast userWith base station to multicast users pmBetween multiple Gauss channel, can Transmission power PBS,Indicate unicast userThe white noise at place,For noise power；
    S52, unicast userModulation is recompiled to the multicast user information of acquisition and generates the unit comprising multicast user information Power signalAnd with predetermined power PdThe information is forwarded to all-multicast user；
    S53, multicast users pmIt receives by unicast userThe information of forwarding, and by the signal and receive signalIt carries out maximum Signal to Interference plus Noise Ratio than merging, after mergingIt indicates are as follows:
  5. 5. the cooperation multicast transmission method according to claim 1 based on non-orthogonal multiple access technology, which is characterized in that The specific method is as follows by step S6:
    S61, unicast userDirectly from reception signalMiddle decoding desired signal S1(t), Signal to Interference plus Noise Ratio at this timeIt indicates Are as follows:
    WhereinAnd gmBase station is respectively indicated to unicast userWith base station to multicast users pmBetween multiple Gauss channel, can use Transmission power PBS；
    S62, multicast users pmDirectly from reception signalMiddle decoding desired signal S0(t), Signal to Interference plus Noise Ratio at this timeIt indicates Are as follows:
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