CN106937256A - A kind of cooperation multicast transmission method based on non-orthogonal multiple access technology - Google Patents
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- 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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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 invention relates to the field of wireless communication, in particular to a cooperative multicast transmission method based on a non-orthogonal multiple access technology.
Background
The development of wireless communication services and mobile end applications brings about a blowout-type increase of data traffic, which makes the demand of people for spectrum resources increasingly stronger. As a novel wireless service, the wireless multicast transmission utilizes the broadcast characteristic of a wireless channel, all users with the same requirements for specific resources in the transmission process are used as a multicast group, the same information is simultaneously sent to all multicast users, and the wireless service is a wireless service with high spectral efficiency and can be widely applied to communication scenes such as video on demand, video conferences, multimedia education and the like.
In the wireless multicast transmission, because the transmission quality of a plurality of users needs to be ensured simultaneously, the system performance is generally limited by the receiving quality of the user with the worst channel gain, and the transmission performance of the multicast system can be improved by effectively resisting channel fading through a cooperative relay technology in a wireless multicast network. Currently, research on wireless cooperative multicast transmission technology has achieved certain results related to papers and patents. In 2013, I-H.Lee and the like propose an optimal multicast relay selection scheme in ' IEEE Communications Letters ' (the Commission on the International Electrical and electronics Engineers, communication fast Commission '), which can enable a cooperative multicast system to obtain the maximum diversity gain and improve the transmission reliability of the system. However, this scheme requires global instantaneous channel state information of the whole system, the system complexity is high and the overhead is large, and the transmission reliability of the system will be deteriorated as the number of system users increases. In 2015, L Yang et al proposed a cooperative multicast scheme based on optimal user forwarding in IEEE Transactions on Vehicular Technology (International institute of Electrical and electronics Engineers, vehicle Technology, Inc.). In the scheme, the system selects the best user from the multicast users with successful decoding to serve as a relay, and forwards information to the multicast users with failed decoding. The scheme can obtain full diversity gain, and the diversity gain order is equal to the number of the multicast users, which shows that the reliability of the scheme is improved along with the increase of the number of the users, and the defect that the reliability of the optimal relay forwarding cooperative multicast is deteriorated along with the increase of the number of the users is overcome. However, most nodes participating in the cooperation in the existing cooperative multicast technology are specially deployed relays or multicast users in the network, and the flexibility of the application is low.
On the other hand, the non-orthogonal multiple access technology, as an information multiple access means, can greatly improve the spectrum utilization efficiency of increasingly scarce available spectrum resources, transmits a plurality of information streams on channels with overlapped time domains/frequency domains/code domains by using different powers, simultaneously provides wireless services with differentiated requirements for a plurality of users on the same wireless resources, can obviously improve the system spectrum efficiency and the user access capacity, reduces the user scheduling signaling overhead, shortens the access time delay and reduces the energy consumption of terminals. The technology has been widely accepted by the industry at home and abroad as a core candidate technology for future communication and 5G communication.
Disclosure of Invention
Aiming at the defects in the existing cooperative multicast technology and utilizing high spectrum efficiency and huge application potential brought by the orthogonal multiple access technology, the cooperative multicast transmission method based on the non-orthogonal multiple access technology aims to provide a cooperative multicast transmission method based on the non-orthogonal multiple access technology. The method and the device meet the common information requirement of multiple users and the individual user requirement, and simultaneously improve the transmission reliability of the multicast users by utilizing the diversity gain brought by the multiple users.
In order to achieve the purpose, the invention adopts the following technical scheme:
the cooperative multicast transmission method based on the non-orthogonal multiple access technology comprises a base station, N unicast users and M multicast users, wherein the unicast users serve as cooperative relays to assist the base station in forwarding data of the multicast users, and each execution of the method at most comprises 2 transmission time units.
A cooperative multicast transmission method based on a non-orthogonal multiple access technology is disclosed, wherein the network comprises a base station, N unicast users and M multicast users, wherein the unicast users are used as cooperative relays to assist the base station in forwarding data of the multicast users; characterized in that the method comprises the following steps:
s1, the base station arranges the channel gains between the unicast users and the base station in ascending order as | f1|2＜...＜|fn|2＜...＜|fN|2Where | fn|2Representing the nth channel gain value after the ascending sequence arrangement, selecting the unicast users corresponding to the maximum q channel gain values as candidate unicast users by the base station according to the sequencing result and a unicast user candidate set base number q preset by the system, and constructing a unicast user candidate setWherein d isnFor a corresponding channel gain of | fn|2The unicast user of (2);
s2, the base station selects the unicast user candidate setSelects an optimal unicast user dn*Accessed simultaneously with the multicast subscriber and by the unicast subscriber dn*Serving as a cooperative relay to assist the base station to forward the multicast user information;
s3, the base station sends the multicast user and the unicast user dn*The required original information is processed to form a transmission signal SBS(t) the signal comprising the multicast subscriber signal S0(t) and unicast user signal S1(t)；
S4, in the unit transmission unit, the base station sends the unicast user dn*And all multicast subscribers broadcast the transmission signal SBS(t), unicast user dn*Received signal SBS(t) followed by decoding of the multicast subscriber signal S0(t), if successful, go to S5, and if not, go to S6;
s5, unicast user dn*From the received signal S by successive interference cancellation techniquesBS(t) removing the multicast subscriber signal S0(t) after decoding the desired signal S1(t), furthermore unicast user dn*Recoding and modulating the acquired multicast user information to generate a unit power signal containing the multicast user informationAnd forwards the signal to all multicast subscribers in the next transmission unitMulticast user pm(M ∈ { 1.... multidot.M }) receiving the retransmission signalThe signal is compared with a signal S from a base stationBS(t) decoding after merging;
s6, unicast user dn*Directly from the received signal SBS(t) decoding the desired signal S1(t), multicast user pmDirect reception of signal SBS(t) decoding of multicast user signals S0(t)。
Further, the base station acquires the channel gain between the unicast user and the base station by broadcasting a training sequence to the unicast user by the base station, and each unicast user measures the instantaneous channel gain between itself and the base station according to the training sequence and feeds back the measurement result to the base station.
Further, the specific method of step S2 is as follows:
s21, in the candidate setUnicast user d innMethod for obtaining self-to-multicast subscribers p according to claim 2mA channel gain | h between (M ∈ {1,..., M })n,m|2；
S22, in the candidate setUnicast user d innThe channel gain | h obtained respectivelyn,m|2Feeding back to the base station;
s23, for each unicast user dnTo multicast users pmAll have a "minimum channel gain value" notedThe base station selects a unicast user d with the largest 'minimum channel gain value' from the unicast users in all the candidate setsn*As the best unicast user, the process can be expressed as:
the channel gain of the worst forwarding link of the unicast users can be maximized through the criterion;
s24, the base station broadcasts the selection result to each unicast user.
Further, the specific method of step S3 is as follows:
s31, the base station respectively sends multicast user and unicast user dn*The required original information is coded and modulatedConstructing a corresponding unit power signal S0(t) and S1(t)；
S32, the base station distributes the available transmitting power P according to the preset powerBSIn the signal S0(t) and S1(t) inter-base station, in particular signal S0(t) allocating a transmission power of a0PBSIs a signal S1(t) allocating a transmission power of a1PBSWherein a is0And a1A preset power distribution factor is allocated, and a is satisfied0+a1＝1；
S33, the base station superposes the two signals after power distribution to generate a transmission signal SBS(t) can be expressed as:
further, the specific method of step S4 is as follows:
s41, the base station sends signal SBS(t) unicast user d after transmission over a wireless channeln*Received signal ofCan be expressed as:
multicast user pmThe received signals of (a) are:
wherein,andrespectively represent unicast users dn*And multicast users pmWhite noise of (f)n*And gmRespectively representing base station to unicast users dn*And base station to multicast user pmComplex gaussian channel in between, pair fn*And gmTaking the modulus value and then squaring, i.e. | fn*|2And | gm|2Indicating base station to unicast user dn*And base station to multicast user pmA channel gain value in between;
s42, unicast user dn*Decoding multicast user signals, corresponding decoded signal to interference and noise ratioCan be expressed as:
s43, when decoding signal-to-interference-and-noise ratioGreater than a predetermined decoding threshold gammathThen the unicast user d is judgedn*And if the decoding is successful, judging that the decoding is failed.
Further, the specific method of step S5 is as follows:
s51, unicast user dn*After removing the multicast user signal by serial interference elimination technique, a new receiving signal is obtainedAnd decoding the desired signal, corresponding decoding signal-to-noise ratioCan be expressed as:
s52, unicast user dn*Recoding and modulating the acquired multicast user information to generate a unit power signal containing the multicast user informationAnd at a predetermined power PdForwarding the information to all multicast users;
s53, multicast user pmReception by unicast user dn*Information to be retransmitted, and the signal and the received signalMaximum ratio combination is carried out, and the combined signal to interference plus noise ratioExpressed as:
further, the specific method of step S6 is as follows:
s61, unicast user dn*Directly from the received signalIntermediate decoding of the desired signal S1(t) signal to interference and noise ratio at this timeExpressed as:
s62, multicast user pmDirectly from receivingSignalIntermediate decoding of the desired signal S0(t) signal to interference and noise ratio at this timeExpressed as:
the invention has the following advantages:
1. the invention introduces the cooperative relay technology into the wireless multicast system, and enables the multicast user to obtain diversity gain to effectively resist channel fading by selecting the unicast user for cooperative transmission, thereby improving the transmission efficiency and the transmission reliability of the multicast network;
2. different data information is transmitted in a superposition mode through a non-orthogonal multiple access technology, access opportunities are provided for unicast users while multicast users are served, and excitation is provided for the unicast users to become cooperative relays;
3. the cooperative unicast user selection strategy based on the unicast user candidate set not only considers the transmission quality of multicast users, but also ensures that the unicast users accessing the network have higher communication transmission quality by constructing the candidate set, thereby ensuring the transmission fairness of the multicast users and the unicast users.
Drawings
FIG. 1 is a diagram of a model of a cooperative multicast system for use with the present invention;
FIG. 2 is a general flow chart of an implementation of the present invention;
FIG. 3 is a graph of the outage probability versus system transmit power of the present invention;
fig. 4 is a graph of the diversity gain tradeoff between unicast users and multicast users in the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
As shown in fig. 1, the wireless multicast network used in the present invention includes a base station, N unicast users and M multicast users, wherein the unicast users serve as cooperative relays to assist the base station in forwarding data to the multicast users, and each execution of the method includes at most 2 transmission time units.
As shown in fig. 2, the implementation steps of the present invention are as follows:
a cooperative multicast transmission method based on a non-orthogonal multiple access technology is disclosed, wherein the network comprises a base station, N unicast users and M multicast users, wherein the unicast users are used as cooperative relays to assist the base station in forwarding data of the multicast users; characterized in that the method comprises the following steps:
s1, the base station arranges the channel gains between the unicast users and the base station in ascending order as | f1|2＜...＜|fn|2＜...＜|fN|2Where | fn|2Representing the nth channel gain value after the ascending sequence arrangement, selecting the unicast users corresponding to the maximum q channel gain values as candidate unicast users by the base station according to the sequencing result and a unicast user candidate set base number q preset by the system, and constructing a unicast user candidate setWherein d isnFor a corresponding channel gain of | fn|2The unicast user of (2);
s2, the base station selects the unicast user candidate setSelects an optimal unicast user dn*Accessed simultaneously with the multicast subscriber and by the unicast subscriber dn*Serving as a cooperative relay to assist the base station to forward the multicast user information;
s3, the base station sends the multicast user and the unicast user dn*The required original information is processed to form a transmission signal SBS(t) the signal comprising the multicast subscriber signal S0(t) and unicast user signal S1(t)；
S4, in the unit transmission unit, the base station sends the unicast user dn*And all multicast subscribers broadcast the transmission signal SBS(t), unicast user dn*Received signal SBS(t) followed by decoding of the multicast subscriber signal S0(t), if successful, go to S5, and if not, go to S6;
s5, unicast user dn*From the received signal S by successive interference cancellation techniquesBS(t) removing the multicast subscriber signal S0(t) after decoding the desired signal S1(t), furthermore unicast user dn*Recoding and modulating the acquired multicast user information to generate a unit power signal containing the multicast user informationAnd forwards the signal to all multicast subscribers in the next transmission unitMulticast user pm(M ∈ { 1.... multidot.M }) receiving the retransmission signalThe signal is compared with a signal S from a base stationBS(t) decoding after merging;
s6, unicast user dn*Directly from the received signal SBS(t) decoding the desired signal S1(t), multicast user pmDirect reception of signal SBS(t) decoding of multicast user signals S0(t)。
In this embodiment, the base station acquires the channel gain between the unicast user and the base station by broadcasting a training sequence from the base station to the unicast user, and each unicast user measures the instantaneous channel gain between itself and the base station according to the training sequence and feeds back the measurement result to the base station.
In this embodiment, the specific method of step S2 is as follows:
s21, in the candidate setUnicast user d innMethod for obtaining self-to-multicast subscribers p according to claim 2mA channel gain | h between (M ∈ {1,..., M })n,m|2；
S22, in the candidate setUnicast user d innThe channel gain | h obtained respectivelyn,m|2Feeding back to the base station;
s23, for each unicast user dnTo multicast users pmAll have a "minimum channel gain value" notedThe base station selects a unicast user d with the largest 'minimum channel gain value' from the unicast users in all the candidate setsn*As the best unicast user, the process can be expressed as:
the channel gain of the worst forwarding link of the unicast users can be maximized through the criterion;
s24, the base station broadcasts the selection result to each unicast user.
In this embodiment, the specific method of step S3 is as follows:
s31, the base station respectively sends multicast user and unicast user dn*The required original information is coded and modulated to construct a corresponding unit power signal S0(t) and S1(t)；
S32, the base station distributes the available transmitting power P according to the preset powerBSIn the signal S0(t) and S1(t) inter-base station, in particular signal S0(t) allocating a transmission power of a0PBSIs a signal S1(t) allocating a transmission power of a1PBSWherein a is0And a1A preset power distribution factor is allocated, and a is satisfied0+a1＝1；
S33, the base station superposes the two signals after power distribution to generate a transmission signal SBS(t) can be expressed as:
in this embodiment, the specific method of step S4 is as follows:
s41, the base station sends signal SBS(t) unicast user d after transmission over a wireless channeln*Received signal ofCan be expressed as:
multicast user pmThe received signals of (a) are:
wherein,andrespectively represent unicast users dn*And multicast users pmWhite noise of (f)n*And gmRespectively representing base station to unicast users dn*And base station to multicast user pmComplex gaussian channel in between, pair fn*And gmTaking the modulus value and then squaring, i.e. | fn*|2And | gm|2Indicating base station to unicast user dn*And base station to multicast user pmA channel gain value in between;
s42, unicast user dn*Decoding multicast user signals, corresponding decoded signal to interference and noise ratioCan be expressed as:
s43, when decoding signal-to-interference-and-noise ratioGreater than a predetermined decoding threshold gammathThen the unicast user d is judgedn*Success or failure of decodingThe decoding is judged to have failed.
In this embodiment, the specific method of step S5 is as follows:
s51, unicast user dn*After removing the multicast user signal by serial interference elimination technique, a new receiving signal is obtainedAnd decoding the desired signal, corresponding decoding signal-to-noise ratioCan be expressed as:
s52, unicast user dn*Recoding and modulating the acquired multicast user information to generate a unit power signal containing the multicast user informationAnd at a predetermined power PdForwarding the information to all multicast users;
s53, multicast user pmReception by unicast user dn*Information to be retransmitted, and the signal and the received signalMaximum ratio combination is carried out, and the combined signal to interference plus noise ratioExpressed as:
in this embodiment, the specific method of step S6 is as follows:
s61, unicast user dn*Directly from the received signalIntermediate decoding of the desired signal S1(t) signal to interference and noise ratio at this timeExpressed as:
s62, multicast user pmDirectly from the received signalIntermediate decoding of the desired signal S0(t) signal to interference and noise ratio at this timeExpressed as:
the performance of the present invention will be further described in conjunction with simulation experiments.
Fig. 3 shows a performance diagram of the outage probability of the present invention as a function of the system transmit power. It can be seen from the figure that as the transmission power of the system increases, the interruption probability of the system also decreases. Compared with the traditional non-cooperative transmission, the method and the device can realize lower interruption probability and have higher transmission reliability.
Figure 4 shows a plot of the diversity gain trade-off between unicast and multicast users. It can be seen from the figure that there is a certain interaction relationship between the performance of the unicast user and the multicast user, and the size of the unicast user candidate set base number q can be adjusted according to the actual index of the system in the actual transmission, so that both the multicast user and the unicast user can meet the transmission reliability requirement index of themselves.
Various changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the scope of the present invention.
Claims (7)
1. A cooperative multicast transmission method based on a non-orthogonal multiple access technology is disclosed, wherein the network comprises a base station, N unicast users and M multicast users, wherein the unicast users are used as cooperative relays to assist the base station in forwarding data of the multicast users; characterized in that the method comprises the following steps:
s1, the base station arranges the channel gains between the unicast users and the base station in ascending order as | f1|2＜...＜|fn|2＜...＜|fN|2Where | fn|2After the representation is arranged in ascending orderThe nth channel gain value, the base station selects the unicast users corresponding to the maximum q channel gain values as candidate unicast users according to the sorting result and the unicast user candidate set base number q preset by the system, and constructs a unicast user candidate setWherein d isnFor a corresponding channel gain of | fn|2The unicast user of (2);
s2, the base station selects the unicast user candidate setSelects an optimal unicast user dn*Accessed simultaneously with the multicast subscriber and by the unicast subscriber dn*Serving as a cooperative relay to assist the base station to forward the multicast user information;
s3, the base station sends the multicast user and the unicast user dn*The required original information is processed to form a transmission signal SBS(t) the signal comprising the multicast subscriber signal S0(t) and unicast user signal S1(t)；
S4, in the unit transmission unit, the base station sends the unicast user dn*And all multicast subscribers broadcast the transmission signal SBS(t), unicast user dn*Received signal SBS(t) followed by decoding of the multicast subscriber signal S0(t), if successful, go to S5, and if not, go to S6;
s5, unicast user dn*From the received signal S by successive interference cancellation techniquesBS(t) removing the multicast subscriber signal S0(t) after decoding the desired signal S1(t), furthermore unicast user dn*Recoding and modulating the acquired multicast user information to generate a unit power signal containing the multicast user informationAnd forwards the signal to all multicast subscribers in the next transmission unitMulticast user pm(M ∈ { 1.... multidot.M }) receiving the retransmission signalThe signal is compared with a signal S from a base stationBS(t) decoding after merging;
s6, unicast user dn*Directly from the received signal SBS(t) decoding the desired signal S1(t), multicast user pmDirect reception of signal SBS(t) decoding of multicast user signals S0(t)。
2. The cooperative multicast transmission method according to claim 1, wherein the acquisition of the channel gain between the unicast users and the base station by the base station is performed by broadcasting a training sequence from the base station to the unicast users, and each unicast user measures the instantaneous channel gain between itself and the base station according to the training sequence and feeds back the measurement result to the base station.
3. The cooperative multicast transmission method based on non-orthogonal multiple access technology according to claim 1, wherein the specific method of step S2 is as follows:
s21, in the candidate setUnicast user d innMethod for obtaining self-to-multicast subscribers p according to claim 2mA channel gain | h between (M ∈ {1,..., M })n,m|2；
S22, in the candidate setUnicast user d innThe channel gain | h obtained respectivelyn,m|2Feeding back to the base station;
s23, for each unicast user dnTo a plurality ofPlayer pmAll have a "minimum channel gain value" notedThe base station selects a unicast user d with the largest 'minimum channel gain value' from the unicast users in all the candidate setsn*As the best unicast user, the process can be expressed as:
the channel gain of the worst forwarding link of the unicast users can be maximized through the criterion;
s24, the base station broadcasts the selection result to each unicast user.
4. The cooperative multicast transmission method based on non-orthogonal multiple access technology according to claim 1, wherein the specific method of step S3 is as follows:
s31, the base station respectively sends multicast user and unicast user dnCarrying out coding modulation on the required original information to construct a corresponding unit power signal S0(t) and S1(t)；
S32, the base station distributes the available transmitting power P according to the preset powerBSIn the signal S0(t) and S1(t) inter-base station, in particular signal S0(t) allocating a transmission power of a0PBSIs a signal S1(t) allocating a transmission power of a1PBSWherein a is0And a1A preset power distribution factor is allocated, and a is satisfied0+a1＝1；
S33, the base station superposes the two signals after power distribution to generate a transmission signal SBS(t) can be expressed as:
5. the cooperative multicast transmission method based on non-orthogonal multiple access technology according to claim 1, wherein the specific method of step S4 is as follows:
s41, the base station sends signal SBS(t) unicast user d after transmission over a wireless channelnReceived signal ofCan be expressed as:
multicast user pmThe received signals of (a) are:
wherein,andrespectively represent unicast users dnWhite noise at and multicast user pm, fnAnd gm denote base station to unicast user d, respectivelynSum base station to multicast user pmComplex gaussian channel in between, pair fn*And gmTaking the modulus value and then squaring, i.e. | fn*|2And | gm|2Indicating base station to unicast user dn*And base station to multicast user pmA channel gain value in between;
s42, unicast user dn*Decoding multicast user signals, corresponding decoded signal to interference and noise ratioCan be expressed as:
s43, when decoding signal-to-interference-and-noise ratioGreater than a predetermined decoding threshold gammathThen the unicast user d is judgedn*And if the decoding is successful, judging that the decoding is failed.
6. The cooperative multicast transmission method based on non-orthogonal multiple access technology according to claim 1, wherein the specific method of step S5 is as follows:
s51, unicast user dn*After removing the multicast user signal by serial interference elimination technique, a new receiving signal is obtainedAnd decoding the desired signal, corresponding decoding signal-to-noise ratioCan be expressed as:
s52, unicast user dn*Recoding and modulating the acquired multicast user information to generate a unit power signal containing the multicast user informationAnd at a predetermined power PdForwarding the information to all multicast users;
s53, multicast user pmReception by unicast user dn*Information to be retransmitted, and the signal and the received signalMaximum ratio combination is carried out, and the combined signal to interference plus noise ratioExpressed as:
。
7. the cooperative multicast transmission method based on non-orthogonal multiple access technology according to claim 1, wherein the specific method of step S6 is as follows:
s61, unicast user dn*Directly from the received signalIntermediate decoding of the desired signal S1(t) signal to interference and noise ratio at this timeExpressed as:
s62, multicast user pmDirectly from the received signalIntermediate decoding of the desired signal S0(t) signal to interference and noise ratio at this timeExpressed as:
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