CN113824490B - Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access - Google Patents

Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access Download PDF

Info

Publication number
CN113824490B
CN113824490B CN202111409431.XA CN202111409431A CN113824490B CN 113824490 B CN113824490 B CN 113824490B CN 202111409431 A CN202111409431 A CN 202111409431A CN 113824490 B CN113824490 B CN 113824490B
Authority
CN
China
Prior art keywords
user
users
edge
beams
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202111409431.XA
Other languages
Chinese (zh)
Other versions
CN113824490A (en
Inventor
李伊陶
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan University of Science and Engineering
Original Assignee
Sichuan University of Science and Engineering
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan University of Science and Engineering filed Critical Sichuan University of Science and Engineering
Priority to CN202111409431.XA priority Critical patent/CN113824490B/en
Publication of CN113824490A publication Critical patent/CN113824490A/en
Application granted granted Critical
Publication of CN113824490B publication Critical patent/CN113824490B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18519—Operations control, administration or maintenance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access, which comprises the following steps: s1, acquiring a user with an edge and a user with a center; s2, acquiring an original signal; s3, acquiring the received power and data of all central users from the original signal by a joint interference elimination technology; s4, eliminating the received power of all central users in the total received power to obtain the residual received power; and S5, demodulating and decoding the residual receiving power to obtain the sending signal of the edge user and further obtain the sending data of the edge user. The invention combines the non-orthogonal multiple access technology and the soft switching technology, realizes the satellite-ground dual-connection transmission of the switching user through the interference elimination technology, thereby realizing the combined optimization of the satellite-ground link system throughput and the communication service quality of the switching user.

Description

Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access
Technical Field
The invention relates to the field of communication, in particular to a soft handover method based on satellite-ground link uplink non-orthogonal multiple access.
Background
The low earth orbit satellite communication system plays an important role in realizing global mobile communication and a space-ground integrated network, however, due to the rapid movement of the low earth orbit satellite, the satellite-ground link switching is frequent, the communication service quality of a switching user (edge user) is seriously influenced, and great challenges are brought to the resource allocation of the system and the guarantee of the communication service quality of the user. In the prior art, a method for maximizing network throughput or a method for switching user communication service quality priority is mainly researched, only the trade-off between system throughput and switching user communication service quality can be realized, the compromise between the system throughput and the switching user communication service quality is difficult to realize, and the performance and the application of a low-orbit satellite communication system are greatly limited.
Disclosure of Invention
Aiming at the defects in the prior art, the soft handover method based on the satellite-ground link uplink non-orthogonal multiple access solves the problem of poor communication quality of the handover user.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that:
a soft handover method based on satellite-to-ground link uplink non-orthogonal multiple access is provided, which comprises the following steps:
s1, obtaining q wave beams with wave beam overlapping areas, and taking all users in the wave beam overlapping areas as a whole to obtain edge users; taking all users in the area where each beam is not overlapped with other beams as a central user to obtain q central users;
s2, acquiring an original signal: dividing the total uplink transmission power of the edge users into q parts, and respectively transmitting data to corresponding beams by using frequency resources of q central users; simultaneously, all central users adopt all power to send data to corresponding beams;
s3, acquiring the received power and data of all central users from the original signal by a joint interference elimination technology;
s4, eliminating the received power of all central users in the total received power to obtain the residual received power;
and S5, demodulating and decoding the residual receiving power to obtain the sending signal of the edge user and further obtain the sending data of the edge user.
Further, the specific method for acquiring q beams with the beam overlapping area in step S1 is as follows:
for any user, judging whether the user only receives one downlink power, and if so, judging that the user is located in a region which is not overlapped with other wave beams; otherwise, judging whether the difference between all downlink maximum powers received by the user reaches 20%, if so, judging that the user is positioned in a beam overlapping area; thereby acquiring a beam having a beam overlap region.
Further, the specific method for acquiring q beams with the beam overlapping area in step S1 is as follows:
and inquiring the satellite timetable by a user, judging whether the satellite timetable is positioned in the beam overlapping area according to the position of the user and the satellite timetable, and acquiring the wave velocity number of the overlapping area.
Further, the specific method of dividing the total uplink transmission power of the edge users into q parts and respectively transmitting data to the corresponding beams by using the frequency resources of q central users in step S2 includes the following substeps:
s2-1, constructing the following optimization problem under the condition of optimal maximum throughput:
Figure DEST_PATH_IMAGE001
wherein
Figure DEST_PATH_IMAGE002
Representing a constraint; c1, C2, and C3 each represent a frequency resource allocation constraint; c4 and C5 are transmit power constraints; c6 is decoding threshold constraint;
Figure DEST_PATH_IMAGE003
is as followsiA wave beam ofmThe resource situation of the individual edge users,
Figure DEST_PATH_IMAGE004
indicating that the allocation is to be made,
Figure DEST_PATH_IMAGE005
indicating no allocation;
Figure DEST_PATH_IMAGE006
representing edge usersmWhether or not in a beamiInside of
Figure DEST_PATH_IMAGE007
Allocating resources on the channel;Mthe total number of edge users is the total number of edge users,mthe number is given to the edge user,
Figure 748037DEST_PATH_IMAGE007
is as followsiA first of the beamskA number of channel resources, which are,ifor the purpose of the beam numbering,
Figure DEST_PATH_IMAGE008
for edge usersmIn that
Figure 573910DEST_PATH_IMAGE007
The transmit power on the channel, I is the total number of beams,
Figure DEST_PATH_IMAGE009
for the constraint of the total uplink power of the terminal,
Figure DEST_PATH_IMAGE010
as a central userjThe signal-to-interference-and-noise ratio of (c),
Figure DEST_PATH_IMAGE012
is the lowest signal to interference plus noise ratio threshold,
Figure DEST_PATH_IMAGE013
for switching usersmSignal to interference plus noise ratio of;
s2-2, obtaining an iterative expression corresponding to the KKT condition through a Lagrangian dual method:
Figure DEST_PATH_IMAGE014
wherein
Figure DEST_PATH_IMAGE015
Are all the lagrange operators and are the lagrange operators,
Figure DEST_PATH_IMAGE016
in order to be the step size,hto optimize the problemThe corresponding lagrange equation; subscript
Figure DEST_PATH_IMAGE017
Is as followsnFrequency-multiplexed color of the firstiUnder one beammAn edge user;
Figure DEST_PATH_IMAGE018
is as followsnFrequency-multiplexed color of the firstkA sub-channel;lis the iteration number;
s2-3, solving the iterative formula through a gradient descent method to obtain an optimal uplink transmission power distribution scheme and a power and frequency resource matching scheme of the edge users, dividing the total uplink transmission power of the edge users into q parts, and respectively transmitting data to corresponding beams by using the frequency resources of q central users.
The invention has the beneficial effects that: the invention combines the non-orthogonal multiple access technology and the soft switching technology, realizes the satellite-ground dual-connection transmission of the switching user through the interference elimination technology, thereby realizing the combined optimization of the satellite-ground link system throughput and the communication service quality of the switching user.
Drawings
FIG. 1 is a schematic flow diagram of the process;
fig. 2 is a schematic view of a satellite-ground link access scenario for a multi-beam low-orbit satellite communication system;
figure 3 is a schematic diagram of a multi-beam joint receiver based on non-orthogonal multiple access;
FIG. 4 is a diagram of soft handover transmission based on non-orthogonal multiple access;
FIG. 5 is a diagram of the relationship between normalized uplink and rate and user h power allocation values under different beam center user channel gain conditions;
FIG. 6 is a diagram of the relationship between normalized uplink and rate and user h power allocation values under different beam center user channel gain conditions;
FIG. 7 is a diagram of the relationship between normalized uplink and rate and user h power allocation values under different beam center user channel gain conditions;
fig. 8 is a diagram of the relationship between the normalized uplink and rate and the user h power allocation value under the condition of different beam center user channel gains.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the soft handover method based on satellite-ground link uplink non-orthogonal multiple access includes the following steps:
s1, obtaining q wave beams with wave beam overlapping areas, and taking all users in the wave beam overlapping areas as a whole to obtain edge users; taking all users in the area where each beam is not overlapped with other beams as a central user to obtain q central users; each central user corresponds to one beam, and the number of usable beams of each edge user is the number of overlapped beams;
s2, acquiring an original signal: dividing the total uplink transmission power of the edge users into q parts, and respectively transmitting data to corresponding beams by using frequency resources of q central users; simultaneously, all central users adopt all power to send data to corresponding beams;
s3, acquiring the received power and data of all central users from the original signal by a joint interference elimination technology; the joint interference elimination technology is the prior art and can be realized by a multi-beam joint receiver;
s4, eliminating the received power of all central users in the total received power to obtain the residual received power;
and S5, demodulating and decoding the residual receiving power to obtain the sending signal of the edge user and further obtain the sending data of the edge user.
The specific method for acquiring q beams with the beam overlapping area in step S1 is as follows:
judging whether any user receives only one downlink power, and if so, judging that the user is located in a region which is not overlapped with other beams; otherwise, judging whether the difference between all downlink maximum powers received by the user reaches 20%, if so, judging that the user is positioned in a beam overlapping area; further acquiring a beam with a beam overlapping area;
secondly, inquiring a satellite timetable through a user, judging whether the satellite timetable is positioned in a beam overlapping area according to the position of the user and the satellite timetable, and acquiring the wave velocity number of the overlapping area.
The specific method for dividing the total uplink transmission power of the edge users into q parts and respectively transmitting data to corresponding beams by using the frequency resources of q central users in step S2 includes the following substeps:
s2-1, constructing the following optimization problem under the condition of optimal maximum throughput:
Figure 640830DEST_PATH_IMAGE001
wherein
Figure 184944DEST_PATH_IMAGE002
Representing a constraint; c1, C2, and C3 each represent a frequency resource allocation constraint; c4 and C5 are transmit power constraints; c6 is decoding threshold constraint;
Figure 536291DEST_PATH_IMAGE003
is as followsiA wave beam ofmThe resource situation of the individual edge users,
Figure 623195DEST_PATH_IMAGE004
indicating that the allocation is to be made,
Figure 909951DEST_PATH_IMAGE005
indicating no allocation;
Figure 816727DEST_PATH_IMAGE006
representing edge usersmWhether or not in a beamiInside of
Figure 96399DEST_PATH_IMAGE007
Allocating resources on the channel;Mthe total number of edge users is the total number of edge users,mthe number is given to the edge user,
Figure 37810DEST_PATH_IMAGE007
is as followsiA first of the beamskA number of channel resources, which are,ifor the purpose of the beam numbering,
Figure 999862DEST_PATH_IMAGE008
for edge usersmIn that
Figure 393934DEST_PATH_IMAGE007
The transmit power on the channel, I is the total number of beams,
Figure 352663DEST_PATH_IMAGE009
for the constraint of the total uplink power of the terminal,
Figure 7635DEST_PATH_IMAGE010
as a central userjThe signal-to-interference-and-noise ratio of (c),
Figure DEST_PATH_IMAGE012A
is the lowest signal to interference plus noise ratio threshold,
Figure 839456DEST_PATH_IMAGE013
for switching usersmSignal to interference plus noise ratio (SINR).
S2-2, obtaining an iterative expression corresponding to the KKT condition through a Lagrangian dual method:
Figure 845458DEST_PATH_IMAGE014
wherein
Figure 342299DEST_PATH_IMAGE015
Are all the lagrange operators and are the lagrange operators,
Figure 366624DEST_PATH_IMAGE016
in order to be the step size,ha lagrange equation corresponding to the optimization problem; subscript
Figure 290718DEST_PATH_IMAGE017
Is as followsnFrequency-multiplexed color of the firstiUnder one beammAn edge user;
Figure 659382DEST_PATH_IMAGE018
is as followsnFrequency-multiplexed color of the firstkA sub-channel;lis the iteration number;
s2-3, solving the iterative formula through a gradient descent method to obtain an optimal uplink transmission power distribution scheme and a power and frequency resource matching scheme of the edge users, dividing the total uplink transmission power of the edge users into q parts, and respectively transmitting data to corresponding beams by using the frequency resources of q central users.
In an embodiment of the present invention, before introducing the method, taking maximizing uplink throughput as an example, a system cannot provide uplink resources for a handover user h, and only can serve a user a and a user b respectively, where an uplink rate of the user a is:
Figure DEST_PATH_IMAGE019
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE020
in order to be a bandwidth,
Figure DEST_PATH_IMAGE021
in order to be able to measure the power of the noise,
Figure DEST_PATH_IMAGE022
for the uplink transmit power of user a,
Figure DEST_PATH_IMAGE023
channel gain sum for user a to beam 1 (link 1)The sum of the antenna receive gains. Similarly, the uplink rate of the user b is:
Figure DEST_PATH_IMAGE024
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE025
in order to be a bandwidth,
Figure DEST_PATH_IMAGE026
for the uplink transmit power of user b,
Figure DEST_PATH_IMAGE027
which is the sum of the channel gain of user b to beam 2 (link 2) and the antenna receive gain.
After the invention is introduced, based on the non-orthogonal multiple access technology and the multi-beam joint interference cancellation technology, the switching user h simultaneously uses the frequency resources of the user a and the user b to respectively send data to the beam 1 and the beam 2, the signal of the user h is regarded as noise in the first round of decoding, and no processing is carried out, so that the uplink rate of the user a becomes:
Figure DEST_PATH_IMAGE028
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE029
for the uplink transmit power in beam 1 for user h,
Figure DEST_PATH_IMAGE030
the sum of the channel gain for user h to beam 1 and the antenna receive gain.
Similarly, for user b, the uplink rate becomes:
Figure DEST_PATH_IMAGE031
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE032
for the uplink transmit power in beam 2 for user h,
Figure DEST_PATH_IMAGE033
the sum of the channel gain for user h to beam 2 and the antenna receive gain.
Through the multi-beam interference cancellation technology, after the received signals of the users a and b are solved, the part of signals in the original signals can be cancelled, at this time, the signal of the user h becomes a useful signal, and then demodulation and decoding are performed, so that the rate of the user h in the beam 1 is obtained as follows:
Figure DEST_PATH_IMAGE034
the rate at beam 2 is:
Figure DEST_PATH_IMAGE035
so the sum rate of user h is:
Figure DEST_PATH_IMAGE036
then, after the present invention, the total rate of users a, b and h is:
Figure DEST_PATH_IMAGE037
the rates of increase compared to before the introduction of the present invention were:
Figure DEST_PATH_IMAGE038
software simulation can prove that the increased rate is larger than zero under the conventional signal-to-noise ratio of various multi-beam antenna models, namely, by introducing a soft handover technology based on satellite-ground link uplink non-orthogonal multiple access, although the complexity of a multi-beam receiver is increased, the uplink throughput of a system can be increased, and meanwhile, the communication service quality of a handover user is increased.
For the applied scenario of the present application, the relationship graphs of the normalized uplink and rate and the user h power allocation value under the condition of different beam center user channel gains are obtained as shown in fig. 5, fig. 6, fig. 7, and fig. 8. The normalized channel gains for the 4 graphs are shown in table 1, where the sum rates for users a and b before the introduction of the present invention were 31.02Mbps, 30.27Mbps, and 30.28Mbps, respectively.
TABLE 1
Figure DEST_PATH_IMAGE039
Figure DEST_PATH_IMAGE040
FIG. 5 1 1
FIG. 6 1 0.9
FIG. 7 0.9 1
FIG. 8 0.95 0.95
After the method is introduced, the variation of the sum rates of users a, b and h with the power allocated to user h in beam 1 is shown in fig. 5-8, respectively, where
Figure DEST_PATH_IMAGE041
It can be seen that the optimal power allocation and the total rate under different channel gain conditions are different, but compared with the sum rate before the introduction of the invention, the optimal power allocation and the total rate are obviously improved, and the communication service quality of the switching user is ensured.
In summary, the present invention combines the non-orthogonal multiple access technology and the soft handover technology, and realizes satellite-to-ground dual-connection transmission of the handover user through the interference cancellation technology, thereby realizing joint optimization of satellite-to-ground link system throughput and handover user communication service quality.

Claims (4)

1. A soft handover method based on satellite-to-ground link uplink non-orthogonal multiple access is characterized by comprising the following steps:
s1, obtaining q wave beams with wave beam overlapping areas, and taking all users in the wave beam overlapping areas as a whole to obtain edge users; taking all users in the area where each beam is not overlapped with other beams as a central user to obtain q central users;
s2, acquiring an original signal: dividing the total uplink transmission power of the edge users into q parts, and respectively transmitting data to corresponding beams by using frequency resources of q central users; simultaneously, all central users adopt all power to send data to corresponding beams;
s3, acquiring the received power and data of all central users from the original signal by a joint interference elimination technology;
s4, eliminating the received power of all central users in the total received power to obtain the residual received power;
and S5, demodulating and decoding the residual receiving power to obtain the sending signal of the edge user and further obtain the sending data of the edge user.
2. The soft handover method according to claim 1, wherein the specific method for acquiring q beams with beam overlapping areas in step S1 is as follows:
for any user, judging whether the user only receives one downlink power, and if so, judging that the user is located in a region which is not overlapped with other wave beams; otherwise, judging whether the difference between all downlink maximum powers received by the user reaches 20%, if so, judging that the user is positioned in a beam overlapping area; thereby acquiring a beam having a beam overlap region.
3. The soft handover method according to claim 1, wherein the specific method for acquiring q beams with beam overlapping areas in step S1 is as follows:
and inquiring the satellite timetable by a user, judging whether the satellite timetable is positioned in the beam overlapping area according to the position of the user and the satellite timetable, and acquiring the wave velocity number of the overlapping area.
4. The soft handover method according to claim 1, wherein the specific method of dividing the total uplink transmission power of the edge users into q parts and respectively transmitting data to the corresponding beams by using the frequency resources of q central users in step S2 comprises the following sub-steps:
s2-1, constructing the following optimization problem under the condition of optimal maximum throughput:
Figure 903397DEST_PATH_IMAGE001
wherein
Figure 345224DEST_PATH_IMAGE002
Representing a constraint; c1, C2, and C3 each represent a frequency resource allocation constraint; c4 and C5 are transmit power constraints; c6 is decoding threshold constraint;
Figure 430861DEST_PATH_IMAGE003
is as followsiA wave beam ofmThe resource situation of the individual edge users,
Figure 449983DEST_PATH_IMAGE004
indicating that the allocation is to be made,
Figure 646478DEST_PATH_IMAGE005
indicating no allocation;
Figure 435090DEST_PATH_IMAGE006
representing edge usersmWhether or not in a beamiInside of
Figure 547753DEST_PATH_IMAGE007
Allocating resources on the channel;Mthe total number of edge users is the total number of edge users,mthe number is given to the edge user,
Figure 198046DEST_PATH_IMAGE007
is as followsiA first of the beamskA number of channel resources, which are,ifor the purpose of the beam numbering,
Figure 195302DEST_PATH_IMAGE008
for edge usersmIn that
Figure 635159DEST_PATH_IMAGE007
The transmit power on the channel, I is the total number of beams,
Figure 531440DEST_PATH_IMAGE009
for the constraint of the total uplink power of the terminal,
Figure 993995DEST_PATH_IMAGE010
as a central userjThe signal-to-interference-and-noise ratio of (c),
Figure 797872DEST_PATH_IMAGE011
is the lowest signal to interference plus noise ratio threshold,
Figure 662273DEST_PATH_IMAGE012
for switching usersmSignal to interference plus noise ratio of;
s2-2, obtaining an iterative expression corresponding to the KKT condition through a Lagrangian dual method:
Figure 588510DEST_PATH_IMAGE013
wherein
Figure 30640DEST_PATH_IMAGE014
Are all the lagrange operators and are the lagrange operators,
Figure 776224DEST_PATH_IMAGE015
in order to be the step size,ha lagrange equation corresponding to the optimization problem; subscript
Figure 294799DEST_PATH_IMAGE016
Is as followsnFrequency-multiplexed color of the firstiUnder one beammAn edge user;
Figure 654586DEST_PATH_IMAGE017
is as followsnFrequency-multiplexed color of the firstkA sub-channel;lis the iteration number;
s2-3, solving the iterative formula through a gradient descent method to obtain an optimal uplink transmission power distribution scheme and a power and frequency resource matching scheme of the edge users, dividing the total uplink transmission power of the edge users into q parts, and respectively transmitting data to corresponding beams by using the frequency resources of q central users.
CN202111409431.XA 2021-11-25 2021-11-25 Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access Active CN113824490B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111409431.XA CN113824490B (en) 2021-11-25 2021-11-25 Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111409431.XA CN113824490B (en) 2021-11-25 2021-11-25 Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access

Publications (2)

Publication Number Publication Date
CN113824490A CN113824490A (en) 2021-12-21
CN113824490B true CN113824490B (en) 2022-02-11

Family

ID=78918242

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111409431.XA Active CN113824490B (en) 2021-11-25 2021-11-25 Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access

Country Status (1)

Country Link
CN (1) CN113824490B (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106549884A (en) * 2015-12-31 2017-03-29 南方科技大学 Channel estimation methods and system
WO2018159939A1 (en) * 2017-03-01 2018-09-07 엘지전자 주식회사 Method for transmitting srs in wireless communication system and terminal therefor
CN108781448A (en) * 2016-04-01 2018-11-09 华为技术有限公司 The mechanism of multilevel distributed cooperative multi-point technology
TW201906466A (en) * 2017-05-03 2019-02-01 美商Ｉｄａｃ控股公司 Flexible srs-based uplink beam management
CN110062359A (en) * 2019-04-02 2019-07-26 重庆邮电大学 Based on the highly reliable low delay radio resource allocation optimization method of the short coded block transmission of NOMA in MTC
WO2020165244A1 (en) * 2019-02-13 2020-08-20 Sony Corporation Network entity, user equipment, and method
CN111885732A (en) * 2020-08-06 2020-11-03 桂林电子科技大学 Dynamic resource allocation method for enhancing NOMA visible light communication network security
CN111935843A (en) * 2016-12-09 2020-11-13 三星电子株式会社 Method and apparatus for broadcasting signal and channel for system information transmission
CN112889233A (en) * 2018-10-23 2021-06-01 瑞典爱立信有限公司 Delay and complexity limited transmission in uplink non-orthogonal multiple access (NOMA) hybrid automatic repeat request (HARQ)
CN113541768A (en) * 2021-07-06 2021-10-22 桂林电子科技大学 NOMA-based LEO satellite communication system frequency point allocation method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016021902A1 (en) * 2014-08-03 2016-02-11 엘지전자(주) Method for device-to-device communication in wireless communication system and device therefor
CN106330278B (en) * 2016-09-08 2019-07-30 东南大学 The transmission method that channel estimation and power control based on user up to wave angle combine
CN108419265A (en) * 2017-02-10 2018-08-17 中兴通讯股份有限公司 A kind of power distribution method of virtual subdistrict and base station
CN106972907B (en) * 2017-03-23 2019-05-03 北京工业大学 Extensive antenna system channel training and transmission process inter-cell interference cancellation method
CN112996113A (en) * 2019-12-17 2021-06-18 中国电信股份有限公司 Method, system and base station for suppressing interference between users

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106549884A (en) * 2015-12-31 2017-03-29 南方科技大学 Channel estimation methods and system
CN108781448A (en) * 2016-04-01 2018-11-09 华为技术有限公司 The mechanism of multilevel distributed cooperative multi-point technology
CN111935843A (en) * 2016-12-09 2020-11-13 三星电子株式会社 Method and apparatus for broadcasting signal and channel for system information transmission
WO2018159939A1 (en) * 2017-03-01 2018-09-07 엘지전자 주식회사 Method for transmitting srs in wireless communication system and terminal therefor
TW201906466A (en) * 2017-05-03 2019-02-01 美商Ｉｄａｃ控股公司 Flexible srs-based uplink beam management
CN112889233A (en) * 2018-10-23 2021-06-01 瑞典爱立信有限公司 Delay and complexity limited transmission in uplink non-orthogonal multiple access (NOMA) hybrid automatic repeat request (HARQ)
WO2020165244A1 (en) * 2019-02-13 2020-08-20 Sony Corporation Network entity, user equipment, and method
CN110062359A (en) * 2019-04-02 2019-07-26 重庆邮电大学 Based on the highly reliable low delay radio resource allocation optimization method of the short coded block transmission of NOMA in MTC
CN111885732A (en) * 2020-08-06 2020-11-03 桂林电子科技大学 Dynamic resource allocation method for enhancing NOMA visible light communication network security
CN113541768A (en) * 2021-07-06 2021-10-22 桂林电子科技大学 NOMA-based LEO satellite communication system frequency point allocation method

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
5G超密集组网中面向NOMA的资源分配策略研究;刘旭;《中国优秀硕士学位论文全文数据库-信息科技辑》;20210815;I1136-124 *
A Hierarchical Approach to Resource Allocation in Extensible Multi-Layer LEO-MSS;YITAO LI等;《IEEE Access》;20200122;第18522-18537页 *
A novel multi-antenna selection scheme of satellite-aerial–terrestrial cooperative network based on CR-NOMA;Long Zhao等;《Physical Communication》;20210412;第1-8页 *
基于LEO-MSS的多层扩展网络场景下的资源分配和切换优化;李伊陶;《中国博士学位论文全文数据库-信息科技辑》;20210115;I136-147 *

Also Published As

Publication number Publication date
CN113824490A (en) 2021-12-21

Similar Documents

Publication Publication Date Title
Gu et al. Dynamic cooperative spectrum sharing in a multi-beam LEO-GEO co-existing satellite system
US20150146565A1 (en) Method and apparatus for downlink transmission in a cloud radio access network
Han et al. Outage performance of NOMA-based UAV-assisted communication with imperfect SIC
CN112260749A (en) Millimeter wave satellite self-return beam forming method
US10243601B2 (en) System and method for frequency reuse for wireless point-to-point backhaul
Ruan et al. Spectral-energy efficiency tradeoff in cognitive satellite-vehicular networks towards beyond 5G
CN115694581A (en) Satellite-ground integrated network user terminal access optimization method based on assistance of intelligent reflecting surface
CN115882924A (en) NOMA-based beam hopping satellite communication system design method
Wang et al. On fairness optimization for NOMA-enabled multi-beam satellite systems
Gu et al. Cooperative spectrum sharing in a co-existing LEO-GEO satellite system
CN114785381A (en) Interference elimination method based on forward link model of multi-beam satellite system
US11438910B2 (en) Transmitter and transmission method
Un et al. Joint transmit beamforming optimization and uplink/downlink user selection in a full-duplex multi-user MIMO system
Lee et al. Interference mitigation for reverse spectrum sharing in B5G/6G satellite-terrestrial networks
CN113824490B (en) Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access
Shibata et al. Two-step dynamic cell optimization algorithm for HAPS mobile communications
CN115001560B (en) Star-ground fusion relay network transmission method based on power domain non-orthogonal multiple access
US8571499B1 (en) Wireless terrestrial communications systems using a line-of-sight frequency for inbound data and a non-line-of-sight frequency for outbound data
CN113950065B (en) Common-frequency interference suppression method based on protection area and directional antenna
CN107517088B (en) Interference analysis method of satellite-ground integrated system based on mixed channel fading
Lou et al. Coverage analysis of large-scale HAPS networks using directional beams
Teng Outage probability and ergodic capacity analysis of satellite–terrestrial NOMA system with mixed RF/mmWave relaying
CN114650090A (en) Decoding power distribution strategy based on non-orthogonal multiple access in cognitive satellite-ground network
CN103780301B (en) Multi-beam satellite mobile communication system joint transmitting and receiving method
Stallo et al. Link performance analysis of multi-user detection techniques for W-band multi-beam satellites

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant