CN114244487A - Cooperative NOMA-VLC communication method based on polar codes - Google Patents

Cooperative NOMA-VLC communication method based on polar codes Download PDF

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CN114244487A
CN114244487A CN202111564049.6A CN202111564049A CN114244487A CN 114244487 A CN114244487 A CN 114244487A CN 202111564049 A CN202111564049 A CN 202111564049A CN 114244487 A CN114244487 A CN 114244487A
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information sequence
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CN114244487B (en
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郭锐
官娟帆
应娜
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Hangzhou Dianzi University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • 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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Abstract

The invention discloses a cooperative NOMA-VLC communication method based on a polar code. The method of the invention firstly groups and pairs users; taking K sub-channels with high reliability in the N sub-channels as sub-channels for transmitting useful information bits, and taking the other N-K sub-channels as sub-channels for transmitting frozen information bits; dynamic power allocation is carried out, the service quality of weak users is met preferentially, and the rest power is allocated to other users; the information sequences are mixed and superposed on a power domain, transmitted to respective users through direct links S _ R and S _ D, and transmitted to the information sequences of indirect links R _ D, so that better transmission quality is obtained, and finally decoded in a receiving end, a decoding module of a relay user R and a decoding module of a destination node user D. The method of the invention effectively improves the reliability and the transmission capacity of the NOMA-VLC communication system.

Description

Cooperative NOMA-VLC communication method based on polar codes
Technical Field
The invention belongs to the technical field of visible light communication, and relates to a cooperative NOMA-VLC communication method based on a polarization code.
Background
The visible light communication technology is to transmit information by means of high speed light and shade flashing signal from fluorescent lamp, LED, etc. the high speed Internet wire device is connected to lighting device and may be used after inserting power plug. The system made by the technology can cover the range of indoor lighting, and the computer does not need to be connected by wires, so the system has wide development prospect. As the demand for data transmission by wireless communication technology increases, radio frequency resources are becoming increasingly scarce. Therefore, the use of NOMA (Non orthogonal Multiple Access) technology on VLC (visible light communication) is attracting great attention in the academic and industrial fields. NOMA is a technique that, unlike conventional multiple access techniques, distinguishes users over the power domain so that multiple users share the same time and frequency domains.
The invention patent application with application number 201910033045.1 discloses a user error performance analysis method of a cooperative NOMA system based on user relay. And the cooperation adopts a direct amplification mode, and a PEP expression is deduced according to a calculus theory. The method is only the derivation of the error rate in theory, and the AF cooperation technology is used for amplifying noise, so that the error phenomenon of NOMA-VLC is caused. The invention patent application No. 202011017213.7 discloses an energy-capturing user-oriented cooperative NOMA transmission protocol that enhances the channel capacity of weak users, so that the system can adaptively control the working state of strong users to increase the system capacity. It only considers the transmission protocol in the context of a pair of users, and there are generally more users in an actual communication scenario. In NOMA decoding using SIC, a user needs to demodulate and discard the interference caused by users with more power than itself in NOMA-VLC system, and then obtain its own effective information, in which case an interference cancellation error may occur. The invention patent application with application number CN113541793A discloses a method for jointly designing access point selection of users and power allocation of access points to enhance the physical layer security performance of a multi-user VLC/RF hybrid network. But the capacity of the inventive system is far from sufficient for the transmission capacity in a multi-user system. And most literature focuses on the analysis of the rate, outage probability of the communication device.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a polar code-based cooperative NOMA-VLC communication method.
In the communication system of the communication method, M users are randomly distributed on an LED (light emitting diode) with the half-angle of the irradiation power of
Figure BDA0003421568150000011
Within a cone of height h. The specific communication method comprises the following steps:
step (1) according to the channel gain between each user and the LED, the users U are arranged in ascending ordermCorresponding channel gain of HmM is 1,2, …, M; performing grouping matching on M users, and gaining the weakest channel by the user U1And the strongest channel gain user UMAs a first group of users G1{U1,UMAnd (4) gaining the user U by the next weak channel2And second strongest user UM-1As a second group of users G2{U2,UM-1And so on;
if M is even number, the number of groups
Figure BDA0003421568150000021
Each user obtains a group match; if M is odd, the number of groups
Figure BDA0003421568150000022
Intermediate users
Figure BDA0003421568150000023
As a single group, the information sequence of the user is directly transmitted through a visible light communication VLC system, and is subjected to SC decoding in a system receiving end to obtain the information sequence of the user
Figure BDA0003421568150000024
Step (2) distributing M information sequences to M users as information sequences to be sent by each user, wherein the information sequences are polarized and constructed into a polarization code, the code length of the polarization code is N, namely the polarization code is provided with N sub-channels, and the information bit length of the polarization code is K; the method of polarization construction is: will be reliable in N sub-channelsK sub-channels with high performance are used as sub-channels for transmitting useful information bits, other N-K sub-channels are used as sub-channels for transmitting frozen information bits, and a user UmThe information sequence of (A) is coded by a polarization code to be Xm，m＝1,2,…,M；
Step (3) dynamic power allocation; the method comprises the following steps:
(3-1) total power P of LEDsumAveragely distributing to each group of users, wherein the sum of the power of two users in each group is Psum/B；
(3-2) allocating the power sum P of each group of users to two users in the group, wherein the allocation method comprises the following steps:
for a group of users Gb{Ub,UM+1-bIs allocated to the weak user UbPower P ofbSatisfy UbMinimum transmission rate, remaining power PM+1-bTo strong users UM+1-b，b＝1,2,…,B；
The objective function of the power distribution is
Figure BDA0003421568150000025
RbIs a weak user UbTransmission rate of RM+1-bIs a strong user UM+1-bThe transmission rate of (c);
wherein, the weak user UbAnd strong user UM+1-bParameter of relationship between
Figure BDA0003421568150000026
Figure BDA0003421568150000027
Is a weak user Ubσ is the channel noise variance;
if beta is obtainedbIf the value is more than 0.5, then take betab0.5, then the group of users Gb{Ub,UM+1-bU for weak and medium usersbThe allocated power is Pb＝(1-βb) P, strong user UM+1-bAllocated power PM+1-b＝βbP；
Step (4) is carried out on each group of usersHybrid superposition coding operation to obtain an information sequence Vm(ii) a For a group of users Gb{Ub,UM+1-b}, user UbObtaining information sequence after mixed superposition coding operation
Figure BDA0003421568150000031
User UM+1-bAfter the mixed superposition coding operation, the information sequence is obtained as
Figure BDA0003421568150000032
Step (5) transmitting the information sequence of the user with strong channel gain and the information sequence of the user with weak channel gain in each group of users respectively through direct links S _ D and S _ R under the LED, wherein the user with strong channel gain is the user at the relay node R, the user with weak channel gain is the user at the destination node D, and the LED is the source node S; the method comprises the following steps: for a group of users Gb{Ub,UM+1-bU, weak userbInformation sequence V received after transmission on direct link S _ Db,S_D＝Vb+nb,S_D，nb,S_DRepresents UbNoise on the direct link S _ D; strong user UM+1-bInformation sequence V received after transmission on direct link S _ RM+1-b,S_R＝VM+1-b+nM+1-b,S_R，nM+1-b,S_RRepresents UM+1-bNoise on the direct link S _ R;
step (6) for a group of users Gb{Ub,UM+1-bS _ R transmission of direct link, strong user UM+1-bInformation sequence V ofM+1-b,S_RSIC decoding is carried out, and user U is detected and separatedbAnd SC decoding the information sequence to obtain the information sequence
Figure BDA0003421568150000033
Then, the same coding method as that in the source node S is adopted to carry out coding on the information sequence
Figure BDA0003421568150000034
Coding is carried out to obtain an information sequence to be sent on an indirect link R _ D
Figure BDA0003421568150000035
Step (7) for a group of users Gb{Ub,UM+1-bU, weak userbThe information sequence received from the indirect link R _ D is
Figure BDA0003421568150000036
Wherein n isb,R_DRepresents noise on the indirect link R _ D;
step (8) for a group of users Gb{Ub,UM+1-b}, user UM+1-bReceiving information sequence C from direct link S _ RM+1-b＝VM+1-b,S_RAnd uses SIC decoding to eliminate user UbAfter the interference, the polarization code SC decoding is carried out to obtain the information sequence YM+1-b；
Step (9) for a group of users Gb{Ub,UM+1-b}, user UbReceiving information sequence V from indirect link S _ D link and R _ Db,S_D、Vb,R_DAnd combining the two to obtain the user UbInformation sequence Cb＝Vb,S_D+Vb,R_DObtaining the information sequence Y by SC decodingb。
The method comprises the steps that firstly, data sent by an LED are subjected to polarization code coding, K sub-channels with higher channel capacity are selected to transmit useful information sequences, and the rest N-K sub-channels transmit freezing sequences; and a cooperative polarization decoding forwarding mode is adopted during communication, namely, a user with strong channel gain is used as a relay, so that the transmission quality of a destination node user is effectively improved. In order to make power allocation more applicable, the invention provides a dynamic power method which preferentially makes users with weak channel gain meet the service quality and allocates the rest power to other users under the condition of considering the channel gain and the service quality of the users, thereby achieving the maximum transmission rate.
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FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart of the dynamic power allocation of the present invention;
FIG. 3 is a diagram of the performance of polar codes and cooperation in a NOMA-VLC system according to an embodiment of the present invention;
FIG. 4 is a performance diagram of dynamic power allocation in accordance with an embodiment of the present invention;
fig. 5 is a graph of the total rate for an embodiment of the invention with dynamic power allocation.
Detailed Description
The technical solution of the present invention is further explained by the following specific examples.
A cooperative NOMA-VLC communication method based on polarization codes is disclosed, wherein M users are randomly distributed in an LED irradiation power half angle in a communication system
Figure BDA0003421568150000045
Within a cone of height h. As shown in fig. 1, the specific communication method is:
step (1) the fixed grouping modules are arranged in ascending order according to the channel gain between each user and the LED, and the users U are arranged after the arrangementmCorresponding channel gain of HmM is 1,2, …, M; performing grouping matching on M users, and gaining the weakest channel by the user U1And the strongest channel gain user UMAs a first group of users G1{U1,UMAnd (4) gaining the user U by the next weak channel2And second strongest user UM-1As a second group of users G2{U2,UM-1And so on. If M is even number, the number of groups
Figure BDA0003421568150000041
Each user obtains a group match; if M is odd, the number of groups
Figure BDA0003421568150000042
Intermediate users
Figure BDA0003421568150000043
As a single group, the information sequence of the user is directly transmitted through the visible light communication VLC system and is received in the systemThe information sequence of the user is obtained by SC decoding in the receiving end
Figure BDA0003421568150000044
And (2) distributing M information sequences to M users by a polarization code coding module to serve as the information sequence to be sent by each user, wherein the polarization of the information sequences is constructed into a polarization code, the code length of the polarization code is N, namely the polarization code is provided with N sub-channels, and the information bit length of the polarization code is K. The method of polarization construction is: using K sub-channels with high reliability as sub-channels for transmitting useful information bits, using other N-K sub-channels as sub-channels for transmitting frozen information bits, and user UmThe information sequence of (A) is coded by a polarization code to be Xm。
Step (3) dynamic power allocation; as shown in fig. 2, specifically:
(3-1) the power distribution module distributes the total power P of the LEDssumAveragely distributing to each group of users, wherein the sum of the power of two users in each group is Psum/B；
(3-2) allocating the power sum P of each group of users to two users in the group, wherein the allocation method comprises the following steps:
for a group of users Gb{Ub,UM+1-bIs allocated to the weak user UbPower P ofbSatisfy UbMinimum transmission rate, remaining power PM+1-bTo strong users UM+1-bAnd B is 1,2, …, B, thereby achieving the purpose of effectively and fairly maximizing the total transmission rate of the users.
User UbActual transmission rate under direct link S _ D
Figure BDA0003421568150000051
PM+1-b,bFor user UM+1-bAnd user UbPower of cooperative communication between Hb,M+1-bFor user UbAnd user UM+1-bThe channel gain of cooperative communication, σ is the channel noise variance, when PM+1-b,b＝PM+1-bWhen R isb,S_DTo a maximum of
Figure BDA0003421568150000052
User UbActual transmission rate under indirect link R _ D:
Figure BDA0003421568150000053
weak user UbTransmission rate
Figure BDA0003421568150000054
Strong user UM+1-bTransmission rate
Figure BDA0003421568150000055
The objective function of the power distribution is
Figure BDA0003421568150000056
Weak user UbAnd strong user UM+1-bParameter of relationship between
Figure BDA0003421568150000057
Obtaining weak user UbTransmission rate R ofbSuppose that
Figure BDA0003421568150000058
I.e. PM+1-bSatisfy the requirement of
Figure BDA0003421568150000059
Among them strong user UM+1-bMinimum power of
Figure BDA00034215681500000510
Solving for
Figure BDA00034215681500000511
I.e. to solve for
Figure BDA00034215681500000512
The KKT formula is obtained as follows:
Figure BDA0003421568150000061
wherein C1 indicates that all users are required to reach the lowest transmission rate, C2 is obtained according to the power distribution principle of NOMA, C3 indicates that the total power is constant, C4 indicates the limitation of power in the indirect link,
Figure BDA0003421568150000062
representing user UbMinimum transmission rate of RM+1-bRepresenting user UM+1-bThe minimum transmission rate of.
Due to the fact that
Figure BDA0003421568150000063
Then
Figure BDA0003421568150000064
Represented by the formula:
Figure BDA0003421568150000065
according to the KKT condition solution, introducing Lagrangian multipliers lambda and mu to construct a Lagrangian equation as follows:
Figure BDA0003421568150000066
according to dynamic power allocation (giving priority to users U in each group)bQuality of service in the distribution to the users UbWhen the power of the transmission reaches its minimum transmission rate
Figure BDA0003421568150000067
Then distributing the residual power to the user UM+1-b) To obtain
Figure BDA0003421568150000068
If PM+1-bCannot satisfy
Figure BDA0003421568150000069
Description of the invention
Figure BDA00034215681500000610
Thus solving for
Figure BDA00034215681500000611
I.e. to solve for
Figure BDA00034215681500000612
Then
Figure BDA00034215681500000613
Similarly, the KKT solution is adopted to obtain:
Figure BDA00034215681500000614
if beta is obtainedbIf the value is more than 0.5, then take betab0.5, then the group of users Gb{Ub,UM+1-bU for weak and medium usersbThe allocated power is Pb＝(1-βb) P, strong user UM+1-bAllocated power PM+1-b＝βbP。
Since the power distribution of the users in each group is not interfered with each other, the maximization function of the total transmission rate of all the users is obtained
Figure BDA0003421568150000071
The power allocation for the following users is: when M is an even number, is { (1-. beta.)1)P,(1-β2)P,..,β2P,β1P }; when M is an odd number, is { (1-. beta.)1)P,(1-β2)P,…,P,…,β2P,β1P}。
Step (4) the mixed superposition coding module acquires the information sequence X from the polarization code coding modulemCarrying out mixed superposition coding operation on each group of users to obtain an information sequence Vm. For a group of users Gb{Ub,UM+1-b}, user UbInformation obtained after hybrid superposition coding operationsSequence of
Figure BDA0003421568150000072
User UM+1-bAfter the mixed superposition coding operation, the information sequence is obtained as
Figure BDA0003421568150000073
And (5) in the direct link transmission module, transmitting the information sequence of each group of users with stronger channel gain (namely, users at the relay node R) and the information sequence of users with weaker channel gain (namely, users at the destination node D) in the hybrid superposition coding module through the direct link S _ D and the direct link S _ R under the LED (source node S) respectively. The method comprises the following steps: for a group of users Gb{Ub,UM+1-bU user with weak channel gainbInformation sequence V received after transmission on direct link S _ Db,S_D＝Vb+nb,S_DWherein n isb,S_DRepresenting user UbNoise on the direct link S _ D. User U with stronger channel gainM+1-bThe information sequence received after transmission on the direct link S _ R is VM+1-b,S_R＝VM+1-b+nM+1-b,S_RWherein n isM+1-b,S_RRepresenting user UM+1-bNoise on the direct link S _ R.
And (6) in the relay decoding and forwarding module, the strong users in each group are used as relays, and the information sequences of the weak users are forwarded through cooperative decoding, so that the information sequences to be sent on the indirect link R _ D are obtained. The method comprises the following steps: for a group of users Gb{Ub,UM+1-bUser U after S _ R transmission of direct linkM+1-bInformation sequence V ofM+1-b,S_RSIC decoding detection is carried out to separate out user UbAnd SC decoding the information sequence to obtain the information sequence
Figure BDA0003421568150000074
The information sequence is then encoded using the same encoding method as in the source node S
Figure BDA0003421568150000075
To carry outCoding to obtain information sequence to be sent on indirect link R _ D
Figure BDA0003421568150000076
And (7) the indirect link transmission module transmits the information sequence to be transmitted in the cooperative decoding and forwarding module to the weak user through the indirect link R _ D. The method comprises the following steps: for a group of users Gb{Ub,UM+1-b}, user UbThe information sequence received from the indirect link R _ D is
Figure BDA0003421568150000077
Wherein n isb,R_DRepresenting the noise on the indirect link R _ D.
And (8) obtaining a decoding sequence of a strong user in each group of users in a relay node user decoding module. The method comprises the following steps: for a group of users Gb{Ub,UM+1-b}, user UM+1-bReceiving information sequence C from direct link S _ RM+1-b＝VM+1-b,S_RAnd uses SIC decoding to eliminate user UbAfter the interference, the polarization code SC decoding is carried out to obtain the information sequence YM+1-b。
And (9) obtaining the decoding sequence of the weak user in each group of users in the destination node user decoding module. The method comprises the following steps: for a group of users Gb{Ub,UM+1-b}, user UbReceiving information sequence V from indirect link S _ D link and indirect link R _ Db,S_D、Vb,R_DAnd combining the two to obtain the user UbInformation sequence Cb＝Vb,S_D+Vb,R_DFinally, SC decoding is adopted to obtain an information sequence Yb。
In order to better show that the communication method provided by the invention is effective, the communication method is simulated, and simulation parameters are set as follows: two users are indoors, the channel gain of the user 1 is 0.025, the channel gain of the user 2 is 0.028, the gain of an indirect link is 0.034, the code length of a polarization code is 1024, the code rate is 0.5, and the total power is 1W.
In accordance with an embodiment of the present invention, shown in FIG. 3The user respectively adopts polar coded NOMA-VLC, NOMA-VLC system adopts cooperative AF technology (CNOMA-VLC-AF) and the invention communication method (polar coded CNOMA-VLC-DF). It can be seen from the figure that the process of the invention performs better under equivalent conditions. Reach a bit error rate of 10-4In the communication system, the user 1 obtains about 1.8dB of gain compared with the uncooperative NOMA-VLC scheme based on the polar codes, and obtains 2.8dB of gain compared with the NOMA-VLC system.
Fig. 4 shows the error performance of the communication system proposed by the present invention under the conditions of using the dynamic power method, using the fixed power allocation method α -1/9, and using the fixed power allocation method α -1/9 for NOMA-VLC based on polar codes, respectively, according to an embodiment of the present invention. Compared with the other two schemes, the performance of the user 2 adopting the dynamic power allocation method in the communication system provided by the invention is more excellent between 20 dB and 51dB, wherein the BER is 10-3 User 2 can obtain gains of 0.7dB and 1.3dB, respectively.
Fig. 5 shows a comparison of the total rate of the communication system of the present invention using the dynamic power allocation method, the fixed power allocation method α 1/9, and the fixed power allocation method α 1/9 for polar code based NOMA-VLC, according to an embodiment of the present invention. It can be seen from the figure that cooperative communication in the present invention can improve the transmission rate. Compared with the fixed power distribution method, the invention effectively and fairly improves the total rate of the user by adopting the dynamic power distribution method.

Claims (1)

1. A cooperative NOMA-VLC communication method based on polarization codes is disclosed, wherein M users are randomly distributed in an LED irradiation power half angle in a communication system
Figure FDA0003421568140000011
Within a cone of height h, the specific communication method is:
step (1) according to the channel gain between each user and the LED, the users U are arranged in ascending ordermCorresponding channel gain of HmM is 1,2, …, M; for M usersGroup matching, the weakest channel gain user U1And the strongest channel gain user UMAs a first group of users G1{U1,UMAnd (4) gaining the user U by the next weak channel2And second strongest user UM-1As a second group of users G2{U2,UM-1And so on;
if M is even number, the number of groups
Figure FDA0003421568140000012
Each user obtains a group match; if M is odd, the number of groups
Figure FDA0003421568140000013
Intermediate users
Figure FDA0003421568140000014
As a single group, the information sequence of the user is directly transmitted through a visible light communication VLC system, and is subjected to SC decoding in a system receiving end to obtain the information sequence of the user
Figure FDA0003421568140000015
Step (2) distributing M information sequences to M users as information sequences to be sent by each user, wherein the information sequences are polarized and constructed into a polarization code, the code length of the polarization code is N, namely the polarization code is provided with N sub-channels, and the information bit length of the polarization code is K; the method of polarization construction is: using K sub-channels with high reliability as sub-channels for transmitting useful information bits, using other N-K sub-channels as sub-channels for transmitting frozen information bits, and user UmThe information sequence of (A) is coded by a polarization code to be Xm，m＝1,2,…,M；
Step (3) dynamic power allocation; the method comprises the following steps:
(3-1) total power P of LEDsumAveragely distributing to each group of users, wherein the sum of the power of two users in each group is Psum/B；
(3-2) allocating the power sum P of each group of users to two users in the group, wherein the allocation method comprises the following steps:
for a group of users Gb{Ub,UM+1-bIs allocated to the weak user UbPower P ofbSatisfy UbMinimum transmission rate, remaining power PM+1-bTo strong users UM+1-b，b＝1,2,…,B；
The objective function of the power distribution is
Figure FDA0003421568140000016
RbIs a weak user UbTransmission rate of RM+1-bIs a strong user UM+1-bThe transmission rate of (c);
wherein, the weak user UbAnd strong user UM+1-bParameter of relationship between
Figure FDA0003421568140000021
Figure FDA0003421568140000022
Is a weak user Ubσ is the channel noise variance;
if beta is obtainedbIf the value is more than 0.5, then take betab0.5, then the group of users Gb{Ub,UM+1-bU for weak and medium usersbThe allocated power is Pb＝(1-βb) P, strong user UM+1-bAllocated power PM+1-b＝βbP；
Step (4) carrying out mixed superposition coding operation on each group of users to obtain an information sequence Vm(ii) a For a group of users Gb{Ub,UM+1-b}, user UbObtaining information sequence after mixed superposition coding operation
Figure FDA0003421568140000023
User UM+1-bAfter the mixed superposition coding operation, the information sequence is obtained as
Figure FDA0003421568140000024
Step (5) transmitting the information sequence of the user with strong channel gain and the information sequence of the user with weak channel gain in each group of users respectively through direct links S _ D and S _ R under the LED, wherein the user with strong channel gain is the user at the relay node R, the user with weak channel gain is the user at the destination node D, and the LED is the source node S; the method comprises the following steps: for a group of users Gb{Ub,UM+1-bU, weak userbInformation sequence V received after transmission on direct link S _ Db,S_D＝Vb+nb,S_D，nb,S_DRepresents UbNoise on the direct link S _ D; strong user UM+1-bInformation sequence V received after transmission on direct link S _ RM+1-b,S_R＝VM+1-b+nM+1-b,S_R，nM+1-b,S_RRepresents UM+1-bNoise on the direct link S _ R;
step (6) for a group of users Gb{Ub,UM+1-bS _ R transmission of direct link, strong user UM+1-bInformation sequence V ofM+1-b,S_RSIC decoding is carried out, and user U is detected and separatedbAnd SC decoding the information sequence to obtain the information sequence
Figure FDA0003421568140000025
Then, the same coding method as that in the source node S is adopted to carry out coding on the information sequence
Figure FDA0003421568140000026
Coding is carried out to obtain an information sequence to be sent on an indirect link R _ D
Figure FDA0003421568140000027
Step (7) for a group of users Gb{Ub,UM+1-bU, weak userbThe information sequence received from the indirect link R _ D is
Figure FDA0003421568140000028
Wherein n isb,R_DRepresents noise on the indirect link R _ D;
step (8) for a group of users Gb{Ub,UM+1-b}, user UM+1-bReceiving information sequence C from direct link S _ RM+1-b＝VM+1-b,S_RAnd uses SIC decoding to eliminate user UbAfter the interference, the polarization code SC decoding is carried out to obtain the information sequence YM+1-b；
Step (9) for a group of users Gb{Ub,UM+1-b}, user UbReceiving information sequence V from indirect link S _ D link and R _ Db,S_D、Vb,R_DAnd combining the two to obtain the user UbInformation sequence Cb＝Vb,S_D+Vb,R_DObtaining the information sequence Y by SC decodingb。
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CN110212967A (en) * 2019-04-26 2019-09-06 西安电子科技大学 Full duplex relaying cooperation communication system performance optimization method based on NOMA
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