CN107342804A - Suppress the method for adjacent star interference in satellite communication system - Google Patents
Suppress the method for adjacent star interference in satellite communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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Abstract
The invention discloses a kind of method for suppressing adjacent star interference in satellite communication system, when the earth station being in communication with each other in communications network system be present, two communicating pairs communicated in system are designated as earth station 1 and earth station 2 respectively；By making earth station 1 and earth station 2 take identical time slot and frequency resource, non-orthogonal multiple is formed, carries out resources configuration optimization；Including：According to the transmission rate of communicating pair, Modulation and Coding Scheme exponent number, spreading ratio, communication bandwidth and timeslot number are calculated respectively, reallocation idle carrier wave and time interval resource, so that earth station 1 and 2 takes identical carrier wave and time slot is transmitted, reach the purpose for saving time-frequency channel resource；Off-axis radiation intensity is reduced by modulation coding mode and spreading ratio choosing method；Both meet adjacent star interference requirement so as to reach, and the effect of running time-frequency resource is saved than Direct-Spread.
Description
Technical field
The present invention relates to the side for suppressing adjacent star interference in technical field of satellite communication, more particularly to a kind of satellite communication system
Method, there is provided (Multi-Frequency Time Division Multiple Access, multi-frequency time division are more by a kind of MF-TDMA
Location) resource optimal distribution method in system, both cause adjacent star interference to meet code requirement, and reach the mesh for saving channel resource again
's.
Background technology
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 distributes time slot and carrier frequency point for each user, had in time domain and frequency domain two-dimensional space division user
Many advantages, such as networking flexibility, power system capacity are big, dilatation facilitates, it is increasingly becoming domestic and international dual-use satellite communication system master
The transmission system of stream.In recent years, to meet the vigorous need of multimedia LEO satellite communications under military/civilian emergency communication and mobile condition
Ask, all greatly develop the satellite communication applications based on MF-TDMA systems both at home and abroad.
Currently, satellite communication system of the China based on MF-TDMA systems has moved to maturity and come into operation.Existing
In larger caliber terminal satellite communication system (antenna aperture be more than one meter), antenna main lobe narrower width, and sidelobe level compared with
It is low, there is good directionality, now system terminal is not made to jamming power very little caused by adjacent star to the performance of adjacent star system
Into crucial effect.But in some satellite communication systems (such as communication in moving system), substantial amounts of very small aperture terminal (Very be present
Small Aperture Terminal, VSAT), its 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 ranges is worked in, VSAT earth station antennas are in off-axis side
Upward EIRP (Effective Isotropic Radiated Power, EIRP) density should be less 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 systems
On the premise of, it is difficult to reach the effect that the adjacent star interference to satellite communication system is suppressed.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention, which provides, suppresses adjacent star interference in a kind of satellite communication system
Method, it is MF-TDMA (Multi-Frequency Time Division Multiple Access, during multifrequency by this method
Divide multiple access) system progress resources configuration optimization, both cause adjacent star interference to meet code requirement, and reach the mesh for saving channel resource again
's.
The present invention principle be：When the earth station being in communication with each other in communications network system be present, by two in system mutually
The earth station communicated is designated as earth station 1 and earth station 2 respectively；Earth station 1 and earth station 2 send signal simultaneously with frequency so that
The both sides being in communication with each other take identical time slot and frequency resource, form non-orthogonal multiple, save time-frequency channel resource.When
When off-axis radiation intensity sum be present beyond the interference of adjacent star, for such case, pass through modulation coding mode and spread spectrum
Radiation intensity is lowered than choosing method, is finally reached and both meets adjacent star interference requirement, and is taken less than Direct-Spread
The effect of running time-frequency resource.
Technical scheme provided by the invention is：
Suppress the method for adjacent star interference in a kind of satellite communication system, when the ground that is in communication with each other in communications network system being present
During the station of face, two communicating pairs communicated in system are designated as earth station 1 and earth station 2 respectively；By making the He of earth station 1
Earth station 2 takes 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 mode and spreading ratio choosing method；So as to reach
Both adjacent star interference requirement had been met, and the effect of running time-frequency resource is saved than Direct-Spread；Specifically comprise the following steps：
1) information rate of communicating pair is designated as R respectively1And R2, according to R1And R2Respectively obtain the modulation of communicating pair
Encoding scheme exponent number, is designated as η1And η2；
2) calculated by equation group formula 5, respectively obtain the spreading ratio k of communicating pair1And k2So that total adjacent star interference meets
ITU is constrained；
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 exponent numbers used；PSDη,1、PSDη,2When respectively earth station 1 and earth station 2 use the MCS of η exponent numbers, dimension
Hold the 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 off-axis θ orientation；ITU (θ) is that the ITU in off-axis θ orientation is constrained；R1、R2Respectively earth station 1 and earth station 2
The rate of information throughput；
3) by the way that communication bandwidth and timeslot number is calculated；
4) communication bandwidth and timeslot number result are calculated according to step 3), distribute the carrier wave and time interval resource of free time, make
Obtain the occupancy identical carrier wave of earth station 1 and 2 and time slot is transmitted.
Method for suppressing adjacent star interference in above-mentioned satellite communication system, further, step 1) passes through formula 3 and formula 4
The Modulation and Coding Scheme exponent number η of communicating pair is calculated respectively1And 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 exponent number that respectively earth station 1 and earth station 2 use；PSDη,1,
PSDη,2When respectively earth station 1 and earth station 2 use the MCS of η exponent numbers, the spindle power spectrum density required for communication is maintained；
Gnorm,1(θ), Gnorm,2(θ) is respectively normalized gain of the antenna in off-axis θ orientation of earth station 1 and earth station 2；ITU (θ) is
The ITU constraints in off-axis θ orientation.
Method for suppressing adjacent star interference in above-mentioned satellite communication system, further, step 3) passes through formula 6 and formula 7
Bandwidth and timeslot number are calculated respectively：
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 grown for time slot
Degree；R1For the transmission rate of earth station 1；η1The Modulation and Coding Scheme exponent number used for earth station 1；k1For the spread spectrum of earth station 1
Than.
Method for suppressing adjacent star interference in above-mentioned satellite communication system, further, in embodiments of the present invention, step
The method of the idle carrier wave of rapid 4) described distribution and time interval resource uses buddy algorithm or the allocation algorithm based on binary tree.
Compared with prior art, the beneficial effects of the invention are as follows：
MF-TDMA systems are obtaining more and more extensive application, but the presence of adjacent star interference turns into and limits its big rule
The bottleneck of mould application.The present invention provides a kind of method for suppressing adjacent star interference in satellite communication system, and the present invention is by will be anon-normal
Hand over multiple access technology to be applied in MF-TDMA systems, be MF-TDMA (Multi-Frequency Time by this method
Division Multiple Access, multi-frequency time division multiple access) system progress resources configuration optimization, done to improve the adjacent star of system
Disturb and provide a kind of effective solution, while save channel resource again, reach both so that adjacent star interference meet code requirement,
And can realizes the effect for saving channel resource.
Brief description of the drawings
Fig. 1 is the FB(flow block) provided by the invention for suppressing adjacent star interference method.
Fig. 2 is that communicating pair saves showing for channel resource using non-orthogonal multiple in the embodiment of the present invention one and embodiment two
It is intended to；
Wherein, (a) be time slot that when not using non-orthogonal multiple technology, earth station 1 and 2 takes, frequency resource and inclined
The adjacent star interference that direction of principal axis gives off, w1And w2The frequency bandwidth taken for both sides；
(b) when being using non-orthogonal multiple, time slot that earth station 1 and 2 takes, frequency resource and given off in off-axis direction
Adjacent star interference, w be take frequency bandwidth；
Dotted line is that adjacent star disturbs the upper limit as defined in ITU in figure, and T is transmission time, and Δ is slot length.
Embodiment
Below in conjunction with the accompanying drawings, the present invention, the model of but do not limit the invention in any way are further described by embodiment
Enclose.
The present invention provides a kind of method for suppressing 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, both caused adjacent star interference to meet code requirement, and reached the purpose for saving channel resource again.
Specifically, non-orthogonal multiple technology is applied in MF-TDMA systems by the present invention, and to be led to 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
On the premise of total adjacent star interference meets ITU constraints, reach the effect for saving frequency and time interval resource.When in communications network system
During in the presence of the earth station being in communication with each other, two earth stations communicated in system are designated as earth station 1 and earth station 2 respectively,
Fig. 1 is the FB(flow block) provided by the invention for suppressing adjacent star interference method, is specifically comprised the steps of；
1) the MCS exponent numbers of communicating pair are 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 η2MCS exponent numbers that respectively earth station 1 and earth station 2 use (order of modulation and code check it
Product)；PSDη,1, PSDη,2When respectively earth station 1 and earth station 2 use the MCS of η exponent numbers, the main shaft work(required for communication 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 off-axis θ orientation increases
Benefit；ITU (θ) is that the ITU in off-axis θ orientation is constrained；
2) spreading ratio of communicating pair is calculated, total adjacent star interference is met that ITU is constrained；
Earth station 1 and the spreading ratio k of earth station 21, k2Tried to achieve by below equation group (formula 5)：
The implication of each parameter is identical with 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 implication of parameter is identical with above formula；
4) according to the result of calculation of step 3), the carrier wave and time interval resource of free time is distributed, makes earth station 1 and 2 take identical
Carrier wave and time slot be transmitted.
Wherein, time slot and frequency allocation method can specifically use buddy algorithm, allocation algorithm based on binary tree etc. into
Ripe method.
The present invention core be：Allow earth station 1 and earth station 2 with frequency while send, allow the both sides being in communication with each other to have taken
Exactly the same time slot and frequency resource, non-orthogonal multiple is formed, save time-frequency channel resource.Surpass for off-axis radiation intensity sum
Go out the situation of adjacent star interference, radiation intensity is lowered by modulation coding mode and spreading ratio choosing method.Wherein, step is passed through
It is rapid 2) to suppress adjacent star with step 3) and disturb, the purpose for saving running time-frequency resource is reached by step 5)；Final realize both meets neighbour
Star is disturbed, and the effect of less running time-frequency resource is taken than Direct-Spread.
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 speed is R1=R2=9.6Kbps, transmission time T=1.25s. system uplink frequencies fu=14.2GHz, downstream frequency fd=
11.9GHz, slot length Δ=0.5ms；
Calculate the MCS exponent numbers of both sides；
η1=2.00, η2=1.00
Thus, when not introducing non-orthogonal multiple, both sides' occupied bandwidth is respectively
It is as shown in Figure 1 using the method provided by the invention for suppressing adjacent star interference, step；Calculate both sides spreading ratio be：
k1=2, k2=1
The bandwidth and slot requirements of both sides is calculated, is respectively：
W=9.6kHz, n=2500
During non-orthogonal multiple, the bandwidth that both sides take is as slot requirements, with a width of 9.6kHz, time slot 2500s.
Therefore, scheme of the present invention not only causes adjacent star interference to meet specification, and nonopiate more compared to not introducing
During location, the total bandwidth (14.4kHz) of both sides, save 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 frequencies fu=14.2GHz, downlink frequency
Rate fd=11.9GHz, slot length Δ=0.5ms；
Calculate the MCS exponent numbers of both sides：
η1=0.67, η2=2.25
When not introducing non-orthogonal multiple, earth station 1 is in order to meet that 2 times of ITU constraints needs are spread, thus both sides' occupied bandwidth
Respectively：
It is as shown in Figure 1 using the method provided by the invention for suppressing adjacent star interference, step；Calculate both sides spreading ratio be：
k1=3, k2=1
Calculate both sides bandwidth and slot requirements be
W=288kHz, n=47
Fig. 2 is that communicating pair saves showing for channel resource using non-orthogonal multiple in the embodiment of the present invention one and embodiment two
It is intended to；Wherein, (a) be time slot that when not using non-orthogonal multiple technology, earth station 1 and 2 takes, frequency resource and in off-axis side
Disturbed to the adjacent star given off, w1And w2The frequency bandwidth taken for both sides；(b) when for using non-orthogonal multiple, earth station 1 and 2
The time slot of occupancy, frequency resource and the adjacent star interference given off in off-axis direction, w are the frequency bandwidth taken；Dotted line is in figure
The adjacent star interference upper limit as defined in ITU, T is transmission time, and Δ is slot length.As shown in Figure 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 that help further understands the present invention, but the skill of this area
Art personnel are appreciated that：Do not departing from the present invention and spirit and scope of the appended claims, 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
The scope that book defines is defined.
Claims (4)
1. suppress the method for adjacent star interference in a kind of satellite communication system, when the ground that is in communication with each other in communications network system being present
When standing, two communicating pairs communicated in system are designated as earth station 1 and earth station 2 respectively；By making earth station 1 and ground
Face station 2 takes identical time slot and frequency resource, forms non-orthogonal multiple, carries out resources configuration optimization；Compiled by modulating
Code mode and spreading ratio choosing method reduce off-axis radiation intensity；Both meet adjacent star interference requirement so as to reach, save time-frequency again
The purpose of channel resource；Specifically comprise the following steps：
1) the Modulation and Coding Scheme exponent number of the communicating pair is respectively obtained by the transmission rate of communicating pair, is designated as η1And η2；
2) calculated by equation group formula 5, respectively obtain the spreading ratio k of the communicating pair1And k2So that total adjacent star interference meets
ITU is constrained；
In formula 5, k1And k2The respectively spreading ratio of earth station 1 and earth station 2；η1And η2Respectively earth station 1 and earth station 2 uses
Modulation and Coding Scheme exponent number；PSDη,1、PSDη,2When respectively earth station 1 and earth station 2 use the MCS of η exponent numbers, communication is maintained
Required spindle power spectrum density；Gnorm,1(θ)、Gnorm,2(θ) is respectively the antenna of earth station 1 and earth station 2 in off-axis θ side
The normalized gain of position；ITU (θ) is that the ITU in off-axis θ orientation is constrained；R1、R2The respectively transmission speed of earth station 1 and earth station 2
Rate；
3) by the way that communication bandwidth and timeslot number is calculated；
4) communication bandwidth and timeslot number result are calculated according to step 3), distribute the carrier wave and time interval resource of free time so that ground
Face station 1 and 2 takes identical carrier wave and time slot is transmitted.
2. suppress the method for adjacent star interference in satellite communication system as claimed in claim 1, it is characterized in that, step 1) passes through formula 3
The Modulation and Coding Scheme exponent number η of communicating pair is calculated respectively 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 exponent number that respectively earth station 1 and earth station 2 use；PSDη,1, PSDη,2
When respectively earth station 1 and earth station 2 use the MCS of η exponent numbers, the spindle power spectrum density required for communication is maintained；Gnorm,1
(θ), Gnorm,2(θ) is respectively normalized gain of the antenna in off-axis θ orientation of earth station 1 and earth station 2；ITU (θ) is off-axis θ
The ITU constraints in orientation.
3. suppress the method for adjacent star interference in satellite communication system as claimed in claim 1, it is characterized in that, step 4) passes through formula 6
Bandwidth and timeslot number are calculated respectively with 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 earth station 1；η1The Modulation and Coding Scheme exponent number used for earth station 1；k1For the spreading ratio of earth station 1.
4. suppress the method for adjacent star interference in satellite communication system as claimed in claim 1, it is characterized in that, the step 5) distribution
Idle carrier wave and the method for time interval resource use buddy algorithm or the allocation algorithm based on binary tree.
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| CN108712202A (en) * | 2018-05-16 | 2018-10-26 | 清华大学 | Evade the method and satellite communication system of co-channel interference by deflecting antenna direction |
| CN110278024A (en) * | 2019-08-07 | 2019-09-24 | 清华大学 | The power system capacity optimization method and device of Communication Satellite Constellation |
| CN111294106A (en) * | 2018-12-06 | 2020-06-16 | 航广卫星网络有限责任公司 | Method and device for controlling off-axis equivalent radiation power of communication-in-motion satellite communication antenna |
| CN112737662A (en) * | 2020-12-22 | 2021-04-30 | 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 |
| CN116760458A (en) * | 2023-08-21 | 2023-09-15 | 成都本原星通科技有限公司 | Satellite communication data safe transmission method based on non-orthogonal multiple access |
| CN117955911A (en) * | 2024-03-27 | 2024-04-30 | 新华三半导体技术有限公司 | Data transmission method based on multi-interface time slot scheduling and network chip |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712202A (en) * | 2018-05-16 | 2018-10-26 | 清华大学 | Evade the method and satellite communication system of co-channel interference by deflecting antenna direction |
| 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 |
| CN111294106A (en) * | 2018-12-06 | 2020-06-16 | 航广卫星网络有限责任公司 | Method and device for controlling off-axis equivalent radiation power of communication-in-motion satellite communication 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 |
| CN110278024A (en) * | 2019-08-07 | 2019-09-24 | 清华大学 | The power system capacity optimization method and device of Communication Satellite Constellation |
| CN112737662A (en) * | 2020-12-22 | 2021-04-30 | 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 |
| 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 |
| CN116760458A (en) * | 2023-08-21 | 2023-09-15 | 成都本原星通科技有限公司 | Satellite communication data safe transmission method based on non-orthogonal multiple access |
| 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 |
| CN117955911A (en) * | 2024-03-27 | 2024-04-30 | 新华三半导体技术有限公司 | Data transmission method based on multi-interface time slot scheduling and network chip |
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| CN107342804B (en) | 2019-07-19 |
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