CN113242600B - Self-adaptive power distribution method suitable for semi-unlicensed NOMA - Google Patents

Self-adaptive power distribution method suitable for semi-unlicensed NOMA Download PDF

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CN113242600B
CN113242600B CN202110499068.9A CN202110499068A CN113242600B CN 113242600 B CN113242600 B CN 113242600B CN 202110499068 A CN202110499068 A CN 202110499068A CN 113242600 B CN113242600 B CN 113242600B
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users
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CN113242600A (en
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刘沛栩
刘洪武
毛玉明
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Shandong Jiaotong University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/543—Allocation or scheduling criteria for wireless resources based on quality criteria based on requested quality, e.g. QoS

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

Abstract

The invention relates to a self-adaptive power distribution method suitable for semi-unlicensed NOMA, which comprises the steps that firstly, an access channel gain threshold value is broadcasted to a plurality of unlicensed users through a base station, and the unlicensed users with the channel gain larger than the channel gain threshold value are allowed to access and transmit; then, according to the channel condition and the service quality requirement of the authorized user, self-adaptive power distribution is carried out on the authorized user; and after receiving the signals, the base station performs continuous interference elimination and decoding on the received signals according to the sequence of the user channel gains. The self-adaptive power distribution method suitable for the semi-unlicensed NOMA, disclosed by the invention, is used for carrying out self-adaptive power distribution on the licensed user according to the channel condition of the licensed user while accessing the unlicensed user, so that the outage probability of the licensed user and the unlicensed user in the semi-unlicensed NOMA system is reduced, and the transmission reliability of the system is improved.

Description

Self-adaptive power distribution method suitable for semi-unlicensed NOMA
Technical Field
The present invention relates to a self-adaptive power allocation method suitable for semi-unlicensed NOMA, and more particularly, to a self-adaptive power allocation method for a semi-unlicensed NOMA uplink transmission, by which outage probabilities of licensed and unlicensed users in a semi-unlicensed NOMA system are reduced.
Background
With the rapid development of the wireless internet of things, more and more internet of things devices need to perform multiple access and transmission through scarce wireless spectrum resources, so that great load pressure is caused on system scheduling and transmission delay, and the unlicensed multiple access and transmission become one of the important development trends of the future wireless internet of things and wireless communication systems. Non-orthogonal multiple access (NOMA) is one of the key technologies for next generation wireless multiple access and transmission, and has received wide attention from industry and academia. Upstream multiple access schemes for semi-unlicensed NOMA are proposed in literature "Grant-based and grant-free multiple access for mMTC"(3GPP TSG RAN WG1 meeting 85,ZTE,Nanjing,China,Rep.R1164268,May 2016.) and literature "Simple semi-grant free transmission strategies assisted by non-orthogonal multiple access"(Z.Ding,R.Schober,P.Fan,and H.V.Poor,IEEE Trans.Common,vol.67,no.6,pp.4464–4478,Jun.2019.), allowing unlicensed users and licensed users with channel gains greater than a threshold to share the same spectrum resource. In the unlicensed multiple access and transmission scenario, when users perform data transmission, there is no need to schedule wireless channel resources through a base station, and different users may occupy the same channel for transmission, resulting in unavoidable multi-user collision. In the implementation scheme of the existing unlicensed NOMA system, a fixed power allocation strategy is adopted for the licensed user and the unlicensed user, so that the outage probability of the licensed user and the unlicensed user in the semi-unlicensed NOMA uplink transmission system is reduced to a certain extent. Analysis and experimental results of the prior art show that when a proper channel gain threshold is selected, the fixed power allocation method can enable the semi-unlicensed user and the licensed user to obtain good interruption performance, ensure the service quality requirement of the licensed user, and obtain diversity gain through setting and selecting the channel gain threshold.
However, in the current semi-unlicensed NOMA system, the adaptive power allocation method capable of fully utilizing the channel state information of the user is still lack of success precedent. Because the channel state information of the user is not fully utilized in the semi-unlicensed NOMA system to carry out self-adaptive power distribution, the transmission reliability of the authorized user and the unlicensed user in the existing semi-unlicensed NOMA system based on fixed power distribution is poor.
In the invention, the inventor provides a self-adaptive power distribution method suitable for semi-unlicensed NOMA aiming at the situation that different users can select the same channel to carry out uplink multiple access and transmission. In the method of the invention, the semi-unlicensed NOMA uplink multiple access system is simultaneously accessed to the licensed user and the unlicensed user, and the self-adaptive power distribution is carried out on the licensed user by utilizing the user channel state information, thereby reducing the outage probability of the licensed user and the unlicensed user and improving the transmission reliability of the system.
Disclosure of Invention
In order to overcome the defects of the technical problems, the invention provides a self-adaptive power distribution method suitable for semi-unlicensed NOMA.
The invention relates to a self-adaptive power distribution method suitable for semi-unlicensed NOMA, which is characterized by comprising the following steps: step one, a base station broadcasts a channel gain threshold phi to M unlicensed users, and the base station can be accessed only when the channel gain of the unlicensed users is larger than the channel gain threshold phi; step two, carrying out self-adaptive power distribution on the authorized user according to the channel condition and the service quality requirement of the authorized user; and thirdly, the base station receives signals, and the base station performs continuous interference elimination and decoding on the received signals according to the sequence of the user channel gains.
The invention relates to a self-adaptive power distribution method suitable for semi-unlicensed NOMA, which is realized by the following substeps:
a) The base station broadcasts a threshold value and user access; the base station broadcasts a channel gain threshold phi, and the unlicensed user compares the channel gain from itself to the base station with the channel gain threshold phi; let K represent the number of users whose channel gain is greater than phi, and represent the set of K users whose channel gain is greater than phi as S k＝{k:|gk|2 is greater than or equal to phi, 1 is less than or equal to K is less than or equal to M, under the precondition that the generality is not lost, the sequence of the channel fading gains of K users in the set S k is |g (M-K+1)|2≤|g(M-K+2)|2≤...≤|g(M)|2; the K unlicensed users in set S k will be accessed according to the principle of power domain NOMA.
The invention discloses a self-adaptive power distribution method suitable for semi-unlicensed NOMA, which is realized by the following sub-steps:
b) Determining an instantaneous rate of an authorized user; assuming that the base station can successfully decode the signals from K unlicensed users with successive interference cancellation, the signals of K unlicensed users may be subtracted from the received superimposed signal before the signals from the licensed user U 0 are detected; considering that the total rate R sum,K of K unlicensed users must be greater than a certain rate threshold, i.e., R sum,k≥KR*, where R * represents the target rate of the unlicensed users, the instantaneous rate obtained by the licensed user U 0 after successive interference cancellation decoding is successful is:
In the case of the formula (1), Is the transmit power of the authorized user, |g 0|2 is the channel gain of the authorized user to the base station, in order to ensure that the quality of service requirement of the authorized user U 0 is met, the following constraints need to be met:
In formula (2), R 0 * represents the target rate of the authorized user U 0;
c) Determining the transmitting power of the authorized user U 0; the transmit power of the authorized user U 0 is adaptively determined according to the following conditions:
In the formula (3) of the present invention, Is dependent on/>Constant of (2); if the channel gain of authorized user U 0 is satisfiedThe quality of service requirements of the authorized user U 0 can be guaranteed; on the other hand, when/>Then set upThus, inter-user interference of the signal of the authorized user U 0 in the decoding process of the unauthorized user signal in the continuous interference elimination process is avoided.
The invention relates to a self-adaptive power distribution method suitable for semi-unlicensed NOMA, which is realized by the following substeps:
d) The base station receives the signal; the received signal of the base station can be written as:
In formula (4), P is the transmit power of the unlicensed user, x 0 and x i are the signals of the licensed user U 0 and the i-th unlicensed user, respectively, ω represents an additive white gaussian noise with an average value of zero and a variance of 1;
e) The base station performs continuous interference elimination and decoding; the base station sorts the |g (M-K+1)|2≤|g(M-K+2)|2≤...≤|g(M)|2 according to the magnitude of the channel gain, and carries out continuous interference elimination and decoding on the signals of the unauthorized users according to the sequence from large to small; the total rate of K unlicensed users in the set S k obtained by the system through successive interference cancellation and decoding can be expressed as:
according to the adaptive power allocation situation of the second step, if Then the signal of the authorized user is detected and decoded in the last step of successive interference cancellation, the authorized user obtaining the transmission rate/>If the adaptive power allocation situation of the second step is/>The authorized user has no access and no transmission and no interference is caused to the access and transmission of the unauthorized user.
Drawings
FIG. 1 is a schematic diagram of authorized/unauthorized user pairing
FIG. 2 is a graph of experimental results of outage probability of an authorized user as a function of transmit power
Fig. 3 is a graph of experimental results of the outage probability of K unlicensed users with the change of the transmission power when P 0 =15 dB
Fig. 4 is a graph of experimental results of the outage probability of K unlicensed users with the change of the transmission power when P 0 =0.1p
Detailed Description
The invention will be further described with reference to the drawings and examples.
With the rapid development of the wireless internet of things, more and more internet of things devices need to perform multiple access and transmission through scarce wireless spectrum resources, so that great load pressure is caused on system scheduling and transmission delay, and the unlicensed multiple access and transmission become one of the important development trends of the future wireless internet of things and wireless communication systems. NOMA is one of the key technologies for next generation wireless multiple access and transmission. The semi-unlicensed NOMA uplink multiple access system can be simultaneously accessed to an authorized user and an unlicensed user, and utilizes user channel state information to perform self-adaptive power distribution for the unlicensed user, thereby reducing the outage probability of the authorized user and the unlicensed user and improving the transmission reliability of the system.
The invention provides a self-adaptive power distribution method suitable for semi-unlicensed NOMA, which aims at the situation that different users can select the same channel to carry out uplink multiple access and transmission, a semi-unlicensed NOMA uplink multiple access system simultaneously accesses an authorized user and an unlicensed user, and utilizes user channel state information to carry out self-adaptive power distribution on the authorized user, and a base station carries out continuous interference elimination and decoding on received signals according to the magnitude sequence of user channel gain, thereby reducing the outage probability of the authorized user and the unlicensed user in the semi-unlicensed NOMA system and improving the transmission reliability of the system.
A semi-unlicensed NOMA system as shown in fig. 1 includes a base station, an licensed user and M unlicensed users. When uplink access and transmission are carried out, a base station firstly broadcasts a channel gain threshold phi, and an unauthorized user compares the channel gain from the base station to the channel gain threshold phi; let K represent the number of users whose channel gain is greater than phi, and represent the set of K users whose channel gain is greater than phi as S k＝{k:|gk|2 is greater than or equal to phi, 1 is less than or equal to K is less than or equal to M, under the precondition that the generality is not lost, the sequence of the channel fading gains of K users in the set S k is |g (M-K+1)|2≤|g(M-K+2)|2≤...≤|g(M)|2; the K unlicensed users in set S k will be accessed according to the principle of power domain NOMA.
Determining an instantaneous rate of an authorized user; assuming that the base station can successfully decode the signals from K unlicensed users with successive interference cancellation, the signals of K unlicensed users may be subtracted from the received superimposed signal before the signals from the licensed user U 0 are detected; considering that the total rate R sum,K of K unlicensed users must be greater than a certain rate threshold, i.e., R sum,k≥KR*, where R * represents the target rate of the unlicensed users, the instantaneous rate obtained by the licensed user U 0 after successive interference cancellation decoding is successful is:
In the case of the formula (1), Is the transmit power of the authorized user, |g 0|2 is the channel gain of the authorized user to the base station, in order to ensure that the quality of service requirement of the authorized user U 0 is met, the following constraints need to be met:
In formula (2), R 0 * represents the target rate of the authorized user U 0.
Determining the transmitting power of the authorized user U 0; the transmit power of the authorized user U 0 is adaptively determined according to the following conditions:
In the formula (3) of the present invention, Is dependent on/>Constant of (2); if the channel gain of authorized user U 0 is satisfiedThe quality of service requirements of the authorized user U 0 can be guaranteed; on the other hand, when/>Then set upThus, inter-user interference of the signal of the authorized user U 0 in the decoding process of the unauthorized user signal in the continuous interference elimination process is avoided.
The base station receives the signal; the received signal of the base station can be written as:
In formula (4), P is the transmit power of the unlicensed user, x 0 and x i are the signal of the licensed user U 0 and the i-th unlicensed user, respectively, ω represents an additive white gaussian noise with an average value of zero and a variance of 1.
The base station performs continuous interference elimination and decoding; the base station sorts the |g (M-K+1)|2≤|g(M-K+2)|2≤...≤|g(M)|2 according to the magnitude of the channel gain, and carries out continuous interference elimination and decoding on the signals of the unauthorized users according to the sequence from large to small; the total rate of K unlicensed users in the set S k obtained by the system through successive interference cancellation and decoding can be expressed as:
according to the adaptive power allocation situation of the second step, if Then the signal of the authorized user is detected and decoded in the last step of successive interference cancellation, the authorized user obtaining the transmission rate/>If the adaptive power allocation situation of the second step is/>The authorized user has no access and no transmission and no interference is caused to the access and transmission of the unauthorized user.
The self-adaptive power distribution method suitable for the semi-unlicensed NOMA has the advantages of reducing the outage probability of licensed users and unlicensed users and improving the transmission reliability of the system. The obtained interruption probability is verified through a simulation experiment. Corresponding to the simulation experiment result fig. 2, the number of users m=10, r * =0.5 bits andThe dashed lines represent P 0 =5 dB and/>The solid line represents the results when P 0 =10 dB and phi=1. In the simulation experiment results in fig. 3 and 4, m=4 and r * =1.3 bits are set.
Fig. 2 shows experimental results of outage probability of an authorized user as a function of transmission power. As can be seen from the result of fig. 2, the method of the present invention can reduce the outage probability of the authorized user, and improve the transmission reliability of the system. The method of the present invention achieves a lower outage probability than an authorized user employing a fixed power allocation strategy.
Fig. 3 shows the result of the outage probability of an unlicensed user as a function of the transmission power at P 0 =15 dB. From the result of fig. 3, it can be seen that the method of the present invention can reduce the outage probability of the user and improve the transmission reliability of the system. In addition, the results of fig. 3 indicate that unlicensed users can achieve diversity gain in areas where the transmit power is large.
Fig. 4 shows the result of the outage probability of the unlicensed user as a function of the transmission power when P 0 =0.1p. From the result of fig. 4, it can be seen that the method of the present invention can reduce the outage probability of the unauthorized user, and improve the transmission reliability of the system.
In summary, the adaptive power allocation method suitable for the semi-unlicensed NOMA is provided, the semi-unlicensed NOMA uplink multiple access system is simultaneously accessed to the licensed user and the unlicensed user, and the adaptive power allocation is performed on the licensed user by using the user channel state information, so that the outage probability of the licensed user and the unlicensed user in the semi-unlicensed NOMA system is reduced, and the transmission reliability of the system is improved.
The foregoing technical solution is only one embodiment of the present invention, and various modifications and variations can be easily made by those skilled in the art based on the application methods and principles disclosed in the present invention, not limited to the methods described in the foregoing specific embodiments of the present invention, so that the foregoing description is only preferred and not in a limiting sense.

Claims (1)

1. An adaptive power distribution method suitable for semi-unlicensed NOMA is realized through the following steps: step one, a base station broadcasts a channel gain threshold phi to M unlicensed users, and the base station can be accessed only when the channel gain of the unlicensed users is larger than the channel gain threshold phi; step two, carrying out self-adaptive power distribution on the authorized user according to the channel condition and the service quality requirement of the authorized user; step three, the base station receives signals, and the base station performs continuous interference elimination and decoding on the received signals according to the order of the user channel gains;
the first step is realized by the following substeps:
a) The base station broadcasts a threshold value and user access; the base station broadcasts a channel gain threshold phi, and the unlicensed user compares the channel gain from itself to the base station with the channel gain threshold phi; let K represent the number of users whose channel gain is greater than phi, and represent the set of K users whose channel gain is greater than phi as S k＝{k：|gk|2 is greater than or equal to phi, 1 is less than or equal to K is less than or equal to M, under the precondition that the generality is not lost, the sequence of the channel fading gains of K users in the set S k is |g (M-K+1)|2≤|g(M-K+2)|2≤...≤|g(M)|2; according to the principle of the power domain NOMA, K unlicensed users in the set S k are accessed;
The second step is realized by the following substeps:
b) Determining an instantaneous rate of an authorized user; assuming that the base station can successfully decode the signals from K unlicensed users with successive interference cancellation, the signals of K unlicensed users may be subtracted from the received superimposed signal before the signals from the licensed user U 0 are detected; considering that the total rate R sum,K of K unlicensed users must be greater than a certain rate threshold, i.e., R sum,k≥KR*, where R * represents the target rate of the unlicensed users, the instantaneous rate obtained by the licensed user U 0 after successive interference cancellation decoding is successful is:
In the case of the formula (1), Is the transmit power of the authorized user, |g 0|2 is the channel gain of the authorized user to the base station, in order to ensure that the quality of service requirement of the authorized user U 0 is met, the following constraints need to be met:
In formula (2), R 0 * represents the target rate of the authorized user U 0;
c) Determining the transmitting power of the authorized user U 0; the transmit power of the authorized user U 0 is adaptively determined according to the following conditions:
In the formula (3) of the present invention, Is dependent on/>Constant of (2); if the channel gain of authorized user U 0 is satisfiedThe quality of service requirements of the authorized user U 0 can be guaranteed; on the other hand, when/>Then set upThereby avoiding the inter-user interference of the signal of the authorized user U 0 in the decoding process of the signal of the unauthorized user in the continuous interference elimination process;
the third step is realized by the following substeps:
d) The base station receives the signal; the received signal of the base station can be written as:
In formula (4), P is the transmit power of the unlicensed user, x 0 and x i are the signals of the licensed user U 0 and the i-th unlicensed user, respectively, ω represents an additive white gaussian noise with an average value of zero and a variance of 1;
e) The base station performs continuous interference elimination and decoding; the base station sorts the |g (M-K+1)|2≤|g(M-K+2)|2≤...≤|g(M)|2 according to the magnitude of the channel gain, and carries out continuous interference elimination and decoding on the signals of the unauthorized users according to the sequence from large to small; the total rate of K unlicensed users in the set S k obtained by the system through successive interference cancellation and decoding can be expressed as:
according to the adaptive power allocation situation of the second step, if Then the signal of the authorized user is detected and decoded in the last step of successive interference cancellation, the authorized user obtaining the transmission rate/>If the adaptive power allocation situation of the second step is/>The authorized user has no access and no transmission and no interference is caused to the access and transmission of the unauthorized user.
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