CN107342804B - Inhibit the method for adjacent star interference in satellite communication system - Google Patents
Inhibit the method for adjacent star interference in satellite communication system Download PDFInfo
- Publication number
- CN107342804B CN107342804B CN201610273651.7A CN201610273651A CN107342804B CN 107342804 B CN107342804 B CN 107342804B CN 201610273651 A CN201610273651 A CN 201610273651A CN 107342804 B CN107342804 B CN 107342804B
- Authority
- CN
- China
- Prior art keywords
- earth station
- formula
- modulation
- coding scheme
- itu
- 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.)
- Expired - Fee Related
Links
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
Abstract
The invention discloses inhibit the method for adjacent star interference that two communicating pairs communicated with each other in system are denoted as earth station 1 and earth station 2 respectively when there is the earth station being in communication with each other in communications network system in a kind of satellite communication system；By making earth station 1 and earth station 2 occupy identical time slot and frequency resource, non-orthogonal multiple is formed, resources configuration optimization is carried out；Include: according to the transmission rate of communicating pair, calculate separately to obtain Modulation and Coding Scheme order, spreading ratio, communication bandwidth and timeslot number, reallocation idle carrier wave and time interval resource, so that earth station 1 and 2 occupies identical carrier wave and time slot is sent, achieve the purpose that save time-frequency channel resource；Off-axis radiation intensity is reduced by modulation coding scheme and spreading ratio choosing method；Not only meet adjacent star interference requirement to reach, but also saves the effect of running time-frequency resource than Direct-Spread.
Description
Technical field
The present invention relates to the sides for inhibiting adjacent star interference in technical field of satellite communication more particularly to a kind of satellite communication system
Method, providing a kind of MF-TDMA, (Multi-Frequency Time Division Multiple Access, multi-frequency time division are more
Location) resource optimal distribution method in system, not only made adjacent star interference meet code requirement, but also reach the mesh for saving channel resource
's.
Background technique
Multi-frequency time division multiple access (MF-TDMA) system is that one kind combines FDMA (Frequency Division Multiple
Access, frequency division multiple access) and the advantages of TDMA (Time Division Multiple Access, time division multiple acess) two kinds of technologies
Multi-access mode, it divides user in time domain and frequency domain two-dimensional space, distributes time slot and carrier frequency point for each user, has
Many advantages, such as networking flexibility, power system capacity are big, dilatation facilitates is increasingly becoming domestic and international dual-use satellite communication system master
The transmission system of stream.In recent years, the vigorous need to meet multimedia LEO satellite communications under military/civilian emergency communication and mobile condition
It asks, all greatly develops the satellite communication applications based on MF-TDMA system both at home and abroad.
Currently, China has been moved to maturity and has been come into operation based on the satellite communication system of MF-TDMA system.Existing
In larger caliber terminal satellite communication system (antenna aperture be one meter or more), antenna main lobe narrower width, and sidelobe level compared with
It is low, there is good directionality, the jamming power very little that system terminal generates adjacent star at this time does not make the performance of adjacent star system
At crucial effect.But in some satellite communication systems (such as communication in moving system), there are a large amount of very small aperture terminal (Very
Small Aperture Terminal, VSAT), antenna main lobe is wider, and off-axis gain inequality is smaller, and directionality is weaker.On ground
When antenna spindle is directed at own star, stronger jamming power can be given off to adjacent star on off-axis direction.Especially with Geo-synchronous
The development of track (Geostationary Earth Orbit, GEO) satellite communication system, geo-stationary orbit ring is increasingly crowded, adjacent star
Interference problem is further severe.
To limit adjacent star interference, ITU (International Telecommunication Union, international telecommunication connection
Alliance) International Radio Regulation regulation, the GEO satellite communication system of 14GHz frequency range is worked in, VSAT earth station antenna is in off-axis side
Upward effective omnidirectional radiation power (Effective Isotropic Radiated Power, EIRP) density should be lower than certain
Binding occurrence.
The off-axis EIRP density of earth station antenna can be effectively reduced using spread spectrum, however, power system capacity also with
Reduction.Therefore, in existing method, Important Adjustment and not excessive sacrificial system capacity are not being carried out to existing MF-TDMA system
Under the premise of, it is difficult to achieve the effect that inhibit the adjacent star interference of satellite communication system.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention, which provides, inhibits adjacent star interference in a kind of satellite communication system
Method is MF-TDMA (Multi-Frequency Time Division Multiple Access, when multifrequency by this method
Divide multiple access) system progress resources configuration optimization, not only made adjacent star interference meet code requirement, but also reach the mesh for saving channel resource
's.
The principle of the present invention is: when there is the earth station being in communication with each other in communications network system, mutually by two in system
The earth station communicated is denoted as earth station 1 and earth station 2 respectively；Earth station 1 and earth station 2 with frequency while sending signal, so that
The both sides being in communication with each other occupy identical time slot and frequency resource, form non-orthogonal multiple, save time-frequency channel resource.When
When the case where exceeding adjacent star interference there are the sum of off-axis radiation intensity, in response to this, pass through modulation coding scheme and spread spectrum
Radiation intensity is lowered than choosing method, is finally reached and not only meets adjacent star interference requirement, but also is more less than Direct-Spread occupancy
The effect of running time-frequency resource.
Present invention provide the technical scheme that
A kind of method for inhibiting adjacent star interference in satellite communication system, when there is the ground being in communication with each other in communications network system
When the station of face, two communicating pairs communicated with each other in system are denoted as earth station 1 and earth station 2 respectively；By making 1 He of earth station
Earth station 2 occupies identical time slot and frequency resource, forms non-orthogonal multiple, carries out resources configuration optimization, reaches saving
The purpose of time-frequency channel resource；Off-axis radiation intensity is reduced by modulation coding scheme and spreading ratio choosing method；To reach
Not only meet adjacent star interference requirement, but also save the effect of running time-frequency resource than Direct-Spread；Specifically comprise the following steps:
1) information rate of communicating pair is denoted as R respectively1And R2, according to R1And R2Respectively obtain the modulation of communicating pair
Encoding scheme order, is denoted as η1And η2；
2) it is calculated by equation group formula 5, respectively obtains the spreading ratio k of communicating pair1And k2, so that total neighbour's star interference meets
ITU constraint；
In formula 5, k1And k2The respectively spreading ratio of earth station 1 and earth station 2；η1And η2Respectively earth station 1 and earth station
The 2 Modulation and Coding Scheme orders used；PSDη,1、PSDη,2When respectively earth station 1 and earth station 2 use the MCS of η order, dimension
Hold spindle power spectrum density required for communication；Gnorm,1(θ)、Gnorm,2(θ) is respectively that the antenna of earth station 1 and earth station 2 exists
The normalized gain in the off-axis orientation θ；ITU (θ) is that the ITU in the off-axis orientation θ is constrained；R1、R2Respectively earth station 1 and earth station 2
The rate of information throughput；
3) communication bandwidth and timeslot number is obtained by calculation；
4) communication bandwidth and timeslot number are calculated according to step 3) as a result, distributing idle carrier wave and time interval resource, made
It obtains the identical carrier wave of the occupancy of earth station 1 and 2 and time slot is sent.
For the method for inhibiting adjacent star interference in above-mentioned satellite communication system, further, step 1) passes through formula 3 and formula 4
It calculates separately to obtain the Modulation and Coding Scheme order η of communicating pair1And η2:
η1=max η | PSDη,1Gnorm,1(θ)≤ITU (θ) } (formula 3)
η2=max η | PSDη,2Gnorm,2(θ)≤ITU (θ) } (formula 4)
In 3~formula of formula 4, η1And η2The respectively Modulation and Coding Scheme order of earth station 1 and the use of earth station 2；PSDη,1,
PSDη,2When respectively earth station 1 and earth station 2 use the MCS of η order, spindle power spectrum density required for communicating is maintained；
Gnorm,1(θ), Gnorm,2(θ) is respectively normalized gain of the antenna in the off-axis orientation θ of earth station 1 and earth station 2；ITU (θ) is
The ITU constraint in the off-axis orientation θ.
For the method for inhibiting adjacent star interference in above-mentioned satellite communication system, further, step 3) passes through formula 6 and formula 7
It calculates separately to obtain bandwidth and timeslot number:
In 6~formula of formula 7, w is bandwidth usage；N is the timeslot number for needing to distribute；T is transmission time；Δ is that time slot is long
Degree；R1For the transmission rate of earth station 1；η1The Modulation and Coding Scheme order used for earth station 1；k1For the spread spectrum of earth station 1
Than.
For the method for inhibiting adjacent star interference in above-mentioned satellite communication system, further, in embodiments of the present invention, step
The method of rapid 4) the described distribution idle carrier wave and time interval resource uses buddy algorithm or the allocation algorithm based on binary tree.
Compared with prior art, the beneficial effects of the present invention are:
MF-TDMA system is being more and more widely used, but the presence of adjacent star interference becomes and limits its big rule
The bottleneck of mould application.The present invention provides a kind of method for inhibiting adjacent star interference in satellite communication system, the present invention pass through by it is non-just
It hands over multiple access technology to be applied in MF-TDMA system, is MF-TDMA (Multi-Frequency Time by this method
Division Multiple Access, multi-frequency time division multiple access) system progress resources configuration optimization, it is done to improve the adjacent star of system
It disturbs and provides a kind of effective solution scheme, while saving channel resource again, reach and adjacent star interference is both made to meet code requirement,
It is able to achieve the effect for saving channel resource again.
Detailed description of the invention
Fig. 1 is the flow diagram provided by the invention for inhibiting adjacent star interference method.
Fig. 2 is communicating pair showing using non-orthogonal multiple saving channel resource in the embodiment of the present invention one and embodiment two
It is intended to；
Wherein, (a) is time slot, frequency resource that earth station 1 and 2 occupies and inclined when not using non-orthogonal multiple technology
The adjacent star interference that axis direction gives off, w1And w2The frequency bandwidth occupied for both sides；
(b) for using non-orthogonal multiple when, time slot that earth station 1 and 2 occupies and gives off frequency resource in off-axis direction
Adjacent star interference, w be occupancy frequency bandwidth；
Dotted line is that neighbour's star as defined in ITU interferes the upper limit in figure, and T is transmission time, and Δ is slot length.
Specific embodiment
With reference to the accompanying drawing, the present invention, the model of but do not limit the invention in any way are further described by embodiment
It encloses.
The present invention provides a kind of method for inhibiting adjacent star interference in satellite communication system, is MF-TDMA by this method
(Multi-Frequency Time Division Multiple Access, multi-frequency time division multiple access) system carries out resource optimization
Distribution had not only made adjacent star interference meet code requirement, but also has achieved the purpose that save channel resource.
Specifically, non-orthogonal multiple technology is applied in MF-TDMA system by the present invention, and is logical using non-orthogonal multiple
The both sides of letter select suitable Modulation and Coding Scheme (Modulation and Coding Scheme, MCS) and spreading ratio, so that
Under the premise of total adjacent star interference meets ITU constraint, achieve the effect that save frequency and time interval resource.When in communications network system
When in the presence of the earth station being in communication with each other, two earth stations communicated with each other in system are denoted as earth station 1 and earth station 2 respectively,
Fig. 1 is the flow diagram provided by the invention for inhibiting adjacent star interference method, is specifically comprised the steps of；
1) the MCS order of communicating pair is calculated；
η1=max η | PSDη,1Gnorm,1(θ)≤ITU (θ) } (formula 3)
η2=max η | PSDη,2Gnorm,2(θ)≤ITU (θ) } (formula 4)
In 3~formula of formula 4, η1And η2Respectively earth station 1 and earth station 2 use MCS order (order of modulation and code rate it
Product)；PSDη,1, PSDη,2When respectively earth station 1 and earth station 2 use the MCS of η order, main shaft function required for communicating is maintained
Rate spectrum density；Gnorm,1(θ), Gnorm,2(θ) is respectively that normalization of the antenna of earth station 1 and earth station 2 in the off-axis orientation θ increases
Benefit；ITU (θ) is that the ITU in the off-axis orientation θ is constrained；
2) spreading ratio for calculating communicating pair makes total adjacent star interference meet ITU constraint；
The spreading ratio k of earth station 1 and earth station 21, k2It is acquired by following equation group (formula 5):
The meaning of each parameter is identical as above formula in formula；
3) computation bandwidth and timeslot number；
In formula, w is bandwidth usage, and n is the timeslot number for needing to distribute, and T is transmission time, and Δ is slot length；Remaining
The meaning of parameter is identical as above formula；
4) according to the calculated result of step 3), idle carrier wave and time interval resource are distributed, enables earth station 1 and 2 occupy identical
Carrier wave and time slot sent.
Wherein, time slot and frequency allocation method specifically can using buddy algorithm, allocation algorithm based on binary tree etc. at
Ripe method.
Core of the invention is: allowing earth station 1 and earth station 2 with frequency while sending, the both sides being in communication with each other is allowed to have occupied
Exactly the same time slot and frequency resource forms non-orthogonal multiple, saves time-frequency channel resource.It is super for the sum of off-axis radiation intensity
Out the case where adjacent star interference, radiation intensity is lowered by modulation coding scheme and spreading ratio choosing method.Wherein, pass through step
It is rapid 2) to be interfered with the adjacent star of step 3) inhibition, achieve the purpose that save running time-frequency resource by step 5)；Final realize both meets neighbour
Star interference, than the effect that Direct-Spread occupies less running time-frequency resource.
Embodiment one:
In the present embodiment, the antenna aperture of earth station 1 and earth station 2 is respectively D1=1.2m, D2=0.8m, the biography of both sides
Defeated rate is R1=R2=9.6Kbps, transmission time T=1.25s. system uplink frequency fu=14.2GHz, downstream frequency fd=
11.9GHz, slot length Δ=0.5ms；
Calculate the MCS order of both sides；
η1=2.00, η2=1.00
Thus, when not introducing non-orthogonal multiple, both sides' occupied bandwidth is respectively
Using the method provided by the invention for inhibiting adjacent star interference, step is as shown in Figure 1；Calculate the spreading ratio of both sides are as follows:
k1=2, k2=1
The bandwidth and slot requirements for calculating both sides, are respectively as follows:
W=9.6kHz, n=2500
When non-orthogonal multiple, the bandwidth that both sides occupy is as slot requirements, bandwidth 9.6kHz, time slot 2500s.
Therefore, scheme of the present invention not only makes adjacent star interference meet specification, but also nonopiate more compared to not introducing
When location, the total bandwidth (14.4kHz) of both sides saves 33% channel resource.
Embodiment two:
In the present embodiment, the antenna aperture of earth station 1 and earth station 2 is respectively D1=0.6m, D2=2.4m, transmission rate
Respectively R1=64Kbps, R2=512Kbps, transmission time T=23.5ms. system uplink frequency fu=14.2GHz, downlink frequency
Rate fd=11.9GHz, slot length Δ=0.5ms；
Calculate the MCS order of both sides:
η1=0.67, η2=2.25
When not introducing non-orthogonal multiple, earth station 1 needs 2 times of spread spectrums, thus both sides' occupied bandwidth to meet ITU constraint
It is respectively as follows:
Using the method provided by the invention for inhibiting adjacent star interference, step is as shown in Figure 1；Calculate the spreading ratio of both sides are as follows:
k1=3, k2=1
Calculate both sides bandwidth and slot requirements be
W=288kHz, n=47
Fig. 2 is communicating pair showing using non-orthogonal multiple saving channel resource in the embodiment of the present invention one and embodiment two
It is intended to；Wherein, (a) is time slot, frequency resource that earth station 1 and 2 occupies and in off-axis side when not using non-orthogonal multiple technology
To the adjacent star interference given off, w1And w2The frequency bandwidth occupied for both sides；(b) for using non-orthogonal multiple when, earth station 1 and 2
Time slot, frequency resource and the adjacent star given off in off-axis direction of occupancy interfere, and w is the frequency bandwidth occupied；Dotted line is in figure
Neighbour's star as defined in ITU interferes the upper limit, and T is transmission time, and Δ is slot length.As shown in Fig. 2, scheme of the present invention is not only
So that adjacent star interference meets specification, and compared to both sides' total bandwidth (420kHz) when not introducing non-orthogonal multiple, save frequency
Resource 31.4%.
It should be noted that the purpose for publicizing and implementing example is to help to further understand the present invention, but the skill of this field
Art personnel, which are understood that, not to be departed from the present invention and spirit and scope of the appended claims, and various substitutions and modifications are all
It is possible.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is with claim
Subject to the range that book defines.
Claims (3)
1. inhibit the method for adjacent star interference in a kind of satellite communication system, when there is the ground being in communication with each other in communications network system
When standing, two communicating pairs communicated with each other in system are denoted as the first earth station and the second earth station respectively；By making first
Earth station and the second earth station occupy identical time slot and frequency resource, form non-orthogonal multiple；By modulating-coding side
Formula and spreading ratio choosing method inhibit adjacent star interference；Specifically comprise the following steps:
1) the Modulation and Coding Scheme order that the communicating pair is respectively obtained by the transmission rate of communicating pair, is denoted as η1And η2；
2) it is calculated by equation group formula 5, respectively obtains the spreading ratio k of the communicating pair1And k2, so that total neighbour's star interference meets
ITU constraint；
In formula 5, k1And k2The respectively spreading ratio of the first earth station and the second earth station；η1And η2Respectively the first earth station and
The Modulation and Coding Scheme order that two earth stations use；PSDη,1、PSDη,2Respectively the first earth station and the second earth station use η rank
When several Modulation and Coding Scheme MCS, spindle power spectrum density required for communicating is maintained；Gnorm,1(θ)、Gnorm,2(θ) is respectively
Normalized gain of the antenna of first earth station and the second earth station in the off-axis orientation θ；ITU (θ) be the off-axis orientation θ ITU about
Beam；R1、R2The respectively transmission rate of the first earth station and the second earth station；
3) communication bandwidth and timeslot number is obtained by calculation；It calculates separately to obtain bandwidth and timeslot number especially by formula 6 and formula 7:
In 6~formula of formula 7, w is bandwidth usage；N is the timeslot number for needing to distribute；T is transmission time；Δ is slot length；R1For
The transmission rate of first earth station；η1The Modulation and Coding Scheme order used for the first earth station；k1For the spread spectrum of the first earth station
Than；
4) communication bandwidth and timeslot number are calculated according to step 3) as a result, distributing idle carrier wave and time interval resource, so that the
One earth station and the second earth station occupy identical carrier wave and time slot is sent.
2. inhibiting the method for adjacent star interference in satellite communication system as described in claim 1, characterized in that step 1) passes through formula 3
It calculates separately to obtain the Modulation and Coding Scheme order η of communicating pair with formula 41And η2:
η1=max η | PSDη,1Gnorm,1(θ)≤ITU (θ) } formula 3
η2=max η | PSDη,2Gnorm,2(θ)≤ITU (θ) } formula 4
In 3~formula of formula 4, η1And η2The Modulation and Coding Scheme order that respectively the first earth station and the second earth station use；PSDη,1,
PSDη,2When respectively the first earth station and the second earth station use the Modulation and Coding Scheme MCS of η order, maintain required for communication
Spindle power spectrum density；Gnorm,1(θ), Gnorm,2(θ) is respectively the antenna of the first earth station and the second earth station in the off-axis side θ
The normalized gain of position；ITU (θ) is that the ITU in the off-axis orientation θ is constrained.
3. inhibiting the method for adjacent star interference in satellite communication system as described in claim 1, characterized in that the step 4) distribution
The method of idle carrier wave and time interval resource uses buddy algorithm or the allocation algorithm based on binary tree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610273651.7A CN107342804B (en) | 2016-04-28 | 2016-04-28 | Inhibit the method for adjacent star interference in satellite communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610273651.7A CN107342804B (en) | 2016-04-28 | 2016-04-28 | Inhibit the method for adjacent star interference in satellite communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107342804A CN107342804A (en) | 2017-11-10 |
| CN107342804B true CN107342804B (en) | 2019-07-19 |
Family
ID=60221812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610273651.7A Expired - Fee Related CN107342804B (en) | 2016-04-28 | 2016-04-28 | Inhibit the method for adjacent star interference in satellite communication system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107342804B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712202B (en) * | 2018-05-16 | 2019-05-21 | 清华大学 | The method and satellite communication system for evading co-channel interference are directed toward by deflection antenna |
| CN111294106B (en) * | 2018-12-06 | 2022-06-07 | 航广卫星网络有限责任公司 | Method and device for controlling off-axis equivalent radiation power of satellite communication antenna in motion |
| CN110278024B (en) * | 2019-08-07 | 2020-07-24 | 清华大学 | System capacity optimization method and device for satellite communication constellation |
| CN112737662B (en) * | 2020-12-22 | 2022-08-02 | 中国电子科技集团公司第五十四研究所 | Unmanned aerial vehicle pipeline inspection system and multi-station relay method |
| CN116760458B (en) * | 2023-08-21 | 2023-10-27 | 成都本原星通科技有限公司 | Satellite communication data safe transmission method based on non-orthogonal multiple access |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102300323A (en) * | 2011-08-23 | 2011-12-28 | 西安空间无线电技术研究所 | Space-borne wireless resource management distribution method |
| CN103228048A (en) * | 2013-05-22 | 2013-07-31 | 东南大学 | Uplink multi-user frequency domain resource allocation method based on offset single carrier (OSC) modulation |
-
2016
- 2016-04-28 CN CN201610273651.7A patent/CN107342804B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102300323A (en) * | 2011-08-23 | 2011-12-28 | 西安空间无线电技术研究所 | Space-borne wireless resource management distribution method |
| CN103228048A (en) * | 2013-05-22 | 2013-07-31 | 东南大学 | Uplink multi-user frequency domain resource allocation method based on offset single carrier (OSC) modulation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107342804A (en) | 2017-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107342804B (en) | Inhibit the method for adjacent star interference in satellite communication system | |
| CN105375961B (en) | A kind of satellite band sharing method based on beam-hopping pattern | |
| Weerackody et al. | Technical challenges and performance of satellite communications on-the-move systems | |
| Wang et al. | A flexible resource allocation algorithm in full bandwidth beam hopping satellite systems | |
| CN107104711B (en) | A kind of extensive nonopiate multi-access method | |
| Jaiswal et al. | Performance evaluation of non-orthogonal multiple access in V2V communications over double-Rayleigh fading channels | |
| CN104640217A (en) | Method for joint allocation of uplink and downlink resources of OFDMA (orthogonal frequency division multiple access) network based on network coding | |
| CN109168194B (en) | Method for determining transmitting power in uplink NOMA system based on dynamic user | |
| CN111446991A (en) | SC-OFDMA downlink self-adaptive resource scheduling method for large-scale MIMO satellite communication | |
| Evci et al. | Spectrum management, pricing, and efficiency control in broadband wireless communications | |
| CN106130609B (en) | A kind of cooperation enforcement transmission method of multibeam communication | |
| CN104602357B (en) | Multi-user dispatching method is wirelessly transferred suitable for intelligent grid | |
| Fakhrildin et al. | A Comparative Study of Perfect and Imperfect SIC in Downlink PD-NOMA based on Sharing Bandwidth | |
| Zhang et al. | Interference-aware Resource Allocation in Satellite Integrated Terrestrial Networks | |
| Ramírez et al. | Flexible beam-user mapping for multibeam satellites | |
| CN108668352A (en) | A kind of overocean communications QoS assurance based on multi-beam power distribution | |
| CN111615127B (en) | Cooperative scheduling method for coexistence of fixed satellite service system and 5G cellular network | |
| Vinh et al. | Performance analysis of NOMA beamforming multiple users relay systems | |
| Lee et al. | RSMA-Enabled Multigroup Multicast Rate-Matching for Multibeam Satellite Systems | |
| CN102752020A (en) | Method for managing distributed dynamic spectrums in digital subscriber line uplink system | |
| CN113824490B (en) | Soft switching method based on satellite-to-ground link uplink non-orthogonal multiple access | |
| Dutta et al. | Joint Power Allocation and User-Pairing in Multi-Beam Hybrid Satellite Terrestrial Networks | |
| Zhang et al. | Soft frequency reuse scheme based frequency sharing in satellite terrestrial integrated mobile communication system | |
| Oh et al. | Interference mitigation using exclusion area between multi-beam satellite system and terrestrial system | |
| Oh et al. | Compatibility study on terrestrial radio system operated in the coverage of multi-beam satellite system |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190719 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |