CN103269486A - Air-ground data transmission method, device and system - Google Patents
Air-ground data transmission method, device and system Download PDFInfo
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- CN103269486A CN103269486A CN2013101370849A CN201310137084A CN103269486A CN 103269486 A CN103269486 A CN 103269486A CN 2013101370849 A CN2013101370849 A CN 2013101370849A CN 201310137084 A CN201310137084 A CN 201310137084A CN 103269486 A CN103269486 A CN 103269486A
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Abstract
The invention discloses an air-ground data transmission method, a device and a system. A second aircraft mated with a first aircraft is determined through network side equipment according to preset mating conditions; the first aircraft is positioned at a fringe area in a signal covering range of the network side equipment; the second aircraft is positioned in a core area of the signal covering range of the network side equipment; the network side equipment uses a base layer modulation symbol to modulate first sending information, and uses an additional layer modulation symbol to modulate second sending information; the base layer modulation symbol and the additional layer modulation symbol belong to different modulation symbols in the same modulation mode; and the network side equipment uses the same wireless resource to send the modulated first sending information to the first aircraft and send the modulated second sending information to the second aircraft. The problems that the wireless resource is wasted and the aviation communication capacity is lower existing in a traditional air-ground data transmission system can be solved.
Description
Technical field
The embodiment of the invention relates to system of broadband wireless communication field, macrocellular civil aviaton vacant lot, relates in particular to a kind of vacant lot data transmission method and device, system.
Background technology
At present, one of principal element that influences aircraft vacant lot radio communication is the loss of large scale propagated, can cause the near-far interference of air communications scene, that is to say, be positioned at the aircraft of macrocell base stations nucleus, can realize higher received signal to noise ratio because transmission range is nearer; And be positioned at the aircraft in macrocellular coverage edge zone, because long transmission distance only can reach lower received signal to noise ratio.
Based on traditional vacant lot data transmission system, aircraft under high received signal to noise ratio situation, adopts high-order modulating normally according to the received signal to noise ratio selecting modulation mode, under low received signal to noise ratio situation, adopts the low-order-modulated mode.Yet, based on traditional vacant lot data transmission system, if the Radio Resource of distributing same band for all aircraft, because the influence of above-mentioned near-far interference, can cause the aircraft of fringe region only can realize low rate communication, can not satisfy aviation broadband connections demand; For the communication performance of the aircraft that do not influence fringe region, need to give the aircraft of fringe region distribute more Radio Resource.But, because the received signal to noise ratio of fringe region aircraft is lower, can only use the demodulation of low-order-modulated mode to send to the information of the aircraft of fringe region, the serious waste of the Radio Resource that this aircraft that can cause distributing to fringe region uses, thus the air communications capacity of whole system reduced.
Summary of the invention
The embodiment of the invention provides a kind of vacant lot data transmission method and device, system, in order to solve based on the waste of radio resources that exists in traditional vacant lot data transmission system and the lower problem of air communications capacity.
First aspect the invention provides a kind of vacant lot data transmission method, is applied to civil aviaton's vacant lot system of broadband wireless communication, comprising:
Network equipment is according to default pairing condition, determine second aircraft with the pairing of first aircraft, described first aircraft is positioned at the marginal zone of the signal cover of described network equipment, and described second aircraft is positioned at the core space of the signal cover of described network equipment;
Described network equipment uses the basal layer modulation symbol to modulate the first transmission information, uses the extra play modulation symbol to modulate the second transmission information, and described basal layer modulation symbol and described extra play modulation symbol belong to the different modulating symbol in the same modulation system;
The first transmission information after described network equipment uses identical Radio Resource with described modulation sends to described first aircraft, and the second transmission information after the described modulation is sent to described second aircraft.
Second aspect the invention provides a kind of vacant lot data transmission device, is applied to civil aviaton's vacant lot system of broadband wireless communication, comprising:
Matching module, be used for according to default pairing condition, determine second aircraft with the pairing of first aircraft, described first aircraft is positioned at the marginal zone of the signal cover of described network equipment, and described second aircraft is positioned at the core space of the signal cover of described network equipment;
Modulation module is used for using the basal layer modulation symbol to modulate the first transmission information, uses the extra play modulation symbol to modulate the second transmission information, and described basal layer modulation symbol and described extra play modulation symbol belong to the different modulating symbol in the same modulation system;
Sending module, the first transmission information after being used for using identical Radio Resource with described modulation sends to described first aircraft, and the second transmission information after the described modulation is sent to described second aircraft.
The third aspect the invention provides a kind of vacant lot data transmission system, is applied to civil aviaton's vacant lot system of broadband wireless communication, comprising: network equipment, first aircraft and second aircraft; Wherein, described first aircraft is positioned at the marginal zone of the signal cover of described network equipment, and described second aircraft is positioned at the core space of the signal cover of described network equipment;
Described network equipment comprises above-mentioned vacant lot data transmission device;
Described first aircraft is used for the described basal layer modulation symbol utilize described network equipment to send, carries out the described first transmission information of demodulation after the posterior probability iterative computation of described basal layer modulation symbol;
Described second aircraft is used for the described extra play modulation symbol utilize described network equipment to send, carries out the described second transmission information of demodulation after the posterior probability iterative computation of described extra play modulation symbol.
The embodiment of the invention respectively is divided into marginal zone aircraft group and core space aircraft group according to the positional information of different aircraft with different aircraft by network equipment, afterwards, according to the pairing condition, the aircraft that will be positioned at the marginal zone matches with the aircraft that is positioned at core space, afterwards, use the basal layer modulation symbol to modulate the information that sends to the pairing aircraft that is positioned at the marginal zone, use the extra play modulation symbol to modulate the information that sends to the pairing aircraft that is positioned at core space, afterwards, the information after using identical Radio Resource with above-mentioned modulation sends to the pairing aircraft that is positioned at the marginal zone respectively and is positioned at the aircraft of core space.Further, the pairing aircraft that is positioned at the marginal zone can use the basal layer modulation symbol to demodulate corresponding information, and the aircraft that is positioned at core space can use the extra play modulation symbol to demodulate corresponding information.Thereby the low-order-modulated of basal layer of can using the pairing aircraft that can realize being positioned at the marginal zone realizes the reliable communication under the low received signal to noise ratio situation, and the pairing aircraft that is positioned at core space can use the low-order-modulated of extra play to realize the increment communication of the multiplexed resource under the high received signal to noise ratio situation; Therefore, distribute to the Radio Resource of the pairing aircraft use of marginal zone and use multiplexingly for the pairing aircraft of core space, improved utilization ratio of wireless resources.
Description of drawings
The schematic flow sheet of the vacant lot data transmission method that Fig. 1 provides for one embodiment of the invention;
Fig. 2 is the Organization Chart of the vacant lot data transmission system of embodiment of the invention application;
Fig. 3 is the posterior probability iterative algorithm operation principle schematic diagram of the basal layer modulation symbol of embodiment of the invention application;
Fig. 4 is the posterior probability iterative algorithm operation principle schematic diagram of the extra play modulation symbol of embodiment of the invention application;
The structural representation of the vacant lot data transmission device that Fig. 5 provides for another embodiment of the present invention;
The structural representation of the vacant lot data transmission system that Fig. 6 provides for another embodiment of the present invention;
The 16QAM(4/4 that Fig. 7 uses for the embodiment of the invention) layering gray mappings planisphere.
Embodiment
Based on the waste of radio resources that exists in traditional vacant lot data transmission system and the lower problem of air communications capacity, the embodiment of the invention provides a kind of vacant lot data transmission method, can realize the shared Radio Resource of the aircraft that is positioned at the aircraft of core space and is positioned at the marginal zone, thereby the Radio Resource of whole macro cells can be made rational planning for, overcome the influence that near-far interference brings, improve the utilization ratio of Radio Resource and the air communications capacity of whole system.
The schematic flow sheet of the vacant lot data transmission method that Fig. 1 provides for one embodiment of the invention is applied to civil aviaton's vacant lot system of broadband wireless communication, and as shown in Figure 1, the vacant lot data transmission method of present embodiment comprises:
101, network equipment is determined second aircraft with the pairing of first aircraft according to default pairing condition.
Wherein, described first aircraft is positioned at the marginal zone of the signal cover of described network equipment, and described second aircraft is positioned at the core space of the signal cover of described network equipment.
In an embodiment of the invention, step 101 comprises: the received signal to noise ratio of aircraft of core space that the received signal to noise ratio of described first aircraft is positioned at the signal cover of described network equipment respectively divided by all, get the ratio maximum of received signal to noise ratio, the aircraft of the core space of the signal cover that is positioned at described network equipment of the ratio maximum correspondence of described received signal to noise ratio is defined as second aircraft with described first aircraft pairing.During specific implementation:
Fig. 2 is the Organization Chart of the vacant lot data transmission system of embodiment of the invention application, as shown in Figure 2, network equipment in the present embodiment specifically comprises the ground macrocell base stations in civil aviaton's vacant lot system of broadband wireless communication, at first, macrocell base stations is divided into marginal zone and two zones of core space with its signal cover, during specific implementation, for example, the information covering radius of macrocell base stations can reach 200 nautical miles (about 370km), can suppose to be made as core space in this macrocell base stations signal cover apart from the zone within 100 nautical miles of the macrocell base stations, be made as marginal zone in this macrocell base stations signal cover apart from the zone within outside 100 nautical miles of the macrocell base stations 200 nautical miles; Again for example, the regional received signal to noise ratio far away apart from macrocell base stations is low, the regional received signal to noise ratio height nearer apart from macrocell base stations, therefore, can preset the threshold value of received signal to noise ratio, with in the signal cover of this macrocell base stations, received signal to noise ratio is made as the core space in the signal cover of this macrocell base stations more than or equal to the zone of the threshold value of default received signal to noise ratio; With in the signal cover of this macrocell base stations, received signal to noise ratio is made as the marginal zone in the signal cover of this macrocell base stations less than the zone of the threshold value of default received signal to noise ratio.
Secondly, can receive air traffic control system (ATCS) (Air Traffic Management by the wireless resource scheduling device of this macrocell base stations, ATM) the position of aircraft information that provides, according to certain refreshing frequency (for example, the refreshing frequency of L-DACS-1 candidate standard is 240ms) a plurality of aircraft in the signal cover of described macrocell base stations are divided into groups, specifically can be according to the air line distance of aircraft apart from the base station, the aircraft of marginal zone that will be positioned at the signal cover of this macrocell base stations is divided into marginal zone aircraft group, and the aircraft of core space that will be positioned at the signal cover of this macrocell base stations is divided into and core space aircraft group.
For the aircraft that can realize being positioned at the marginal zone be positioned at the core space aircraft and carry out Radio Resource and share, macrocell base stations is according to default pairing condition, to be positioned at the aircraft of marginal zone and be positioned at the core space aircraft and match one by one, for convenience, the aircraft that will be positioned at the marginal zone is called first aircraft, the aircraft that will be positioned at core space is called second aircraft, and wherein, the pairing condition of first aircraft and second aircraft is optimization aim with maximization system communication capacity.During specific implementation, for example, the 16QAM(4/4 that Fig. 7 uses for the embodiment of the invention) layering gray mappings planisphere, as shown in Figure 7, can match by two aircraft that the ratio maximum between the received signal to noise ratio of all marginal zone aircraft and core space aircraft is corresponding, extra play can be made up like this in the modulation quadrant that is dispersed in basal layer in the vector space that the mapping point on the planisphere concentrates as far as possible (namely, the d1/d2 maximization), reduce the interference to the basal layer modulation symbol to greatest extent, thereby drop to minimum in the performance loss of the same seasonal basal layer that satisfies the extra play performance index.
Further for instance, present embodiment can also adopt the look-up table of resource dynamic matching method or pairing in advance will be positioned at the aircraft of marginal zone and be positioned at the core space aircraft and match, and the present invention does not limit this.
102, network equipment uses the basal layer modulation symbol to modulate the first transmission information, uses the extra play modulation symbol to modulate the second transmission information.
Wherein, described basal layer modulation symbol and described extra play modulation symbol belong to the different modulating symbol in the same modulation system, can be with reference to the related content of the hierarchical modulation in the existing multi-system linearity modulation technique about basal layer modulation symbol and extra play modulation symbol, the present invention does not limit this.
In the present embodiment, network equipment can use the basal layer modulation symbol of same modulation system to modulate the first transmission information, use the extra play modulation symbol of same modulation system to modulate the second transmission information, wherein, the first transmission information is to send to first aircraft that is positioned at the marginal zone, and the second transmission information is to send to second aircraft that is positioned at core space; During specific implementation:
In order not influence the communication performance of first aircraft that is positioned at the marginal zone, distribute more Radio Resource can for first aircraft, but, because first aircraft is positioned at the marginal zone, can only adopt the low-order-modulated mode demodulation first transmission information, in the present embodiment, distribute to the utilization ratio of wireless resources that first aircraft uses in order to improve, reduce waste of radio resources, the first transmission information can be modulated to the basal layer in the planisphere of the low-order-modulated mode that first aircraft uses, the second transmission information is modulated to the extra play in the planisphere of the low-order-modulated mode that above-mentioned first aircraft uses, thereby the low-order-modulated mode of basal layer of can using feasible first aircraft that is positioned at the marginal zone realizes the reliable communication under the low received signal to noise ratio situation, and second aircraft that is positioned at core space can use the low-order-modulated of extra play to realize the increment communication of wireless resource multiplexing under the high received signal to noise ratio situation; Therefore, distribute to the Radio Resource of the aircraft use of marginal zone and use multiplexingly for the aircraft of core space, improved utilization ratio of wireless resources.
Need to prove, in order to realize that first aircraft can utilize the described first transmission information of basal layer modulation symbol demodulation, and second aircraft can utilize the described second transmission information of extra play modulation symbol demodulation, network equipment need send to the basal layer modulation symbol described first aircraft, and the extra play modulation symbol is sent to described second aircraft.During specific implementation, with 16 quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) (4/4) hierarchical modulation mode is example, forward link agreement according to L-DACS-1 candidate standard, network equipment can be by general controls frame (the Common Control before each subframe, CC) the basal layer 4QAM modulation constellation in 16QAM (4/4) the hierarchical modulation symbol of the first aircraft correspondence or the code name of this planisphere correspondence are sent to first aircraft, the extra play 4QAM modulation constellation in 16QAM (4/4) the hierarchical modulation symbol of the second aircraft correspondence or the code name of this planisphere correspondence are sent to second aircraft.
103, the first transmission information after network equipment uses identical Radio Resource with described modulation sends to described first aircraft, and the second transmission information after the described modulation is sent to described second aircraft.
During specific implementation, in order to realize maximizing the optimization aim of system communication capacity, rationally utilize the Radio Resource of sharing, network equipment can be according to the received signal to noise ratio of described first aircraft and the received signal to noise ratio of described second aircraft, determines the ratio of the energy of the energy of described basal layer modulation symbol and described extra play modulation symbol; For example, according to the pairing aircraft energy than function: d
1/ d
2=f (SNR
i, SNR
j), determine the ratio of the energy of the energy of the basal layer modulation symbol in the described same wireless resource and the extra play modulation symbol in the described same wireless resource;
Afterwards, network equipment is according to the ratio of the energy of the energy of described basal layer modulation symbol and described extra play modulation symbol, determines to distribute to the energy d of the basal layer modulation symbol in the same wireless resource that described first aircraft uses
1And distribute to the energy d of the extra play modulation symbol in the same wireless resource that described second aircraft uses
2
Afterwards, network equipment uses the energy of described basal layer modulation symbol, the first transmission information after the described modulation is sent to described first aircraft, use the energy of described extra play modulation symbol, the second transmission information after the described modulation is sent described second aircraft.
Wherein, above-mentioned parameter d
1The energy of the basal layer modulation symbol in the same wireless resource that described first aircraft uses, parameter d are distributed in expression
2The energy of the extra play modulation symbol in the same wireless resource that described second aircraft uses, parameter S NR are distributed in expression
iThe received signal to noise ratio of representing first aircraft, parameter S NR
jThe received signal to noise ratio of representing second aircraft.
Accordingly, the described basal layer modulation symbol that first aircraft utilizes described network equipment to send carries out the described first transmission information of demodulation after the posterior probability iterative computation of described basal layer modulation symbol; The described extra play modulation symbol that second aircraft utilizes described network equipment to send carries out the described second transmission information of demodulation after the posterior probability iterative computation of described extra play modulation symbol.During specific implementation:
Above-mentioned network equipment adopts identical Radio Resource to send the first transmission information and the second transmission information, and first aircraft and second aircraft can both receive the first transmission information and the second transmission information.
Because first aircraft is positioned at the marginal zone of the signal cover of network equipment, its demodulation target is the first transmission information that the basal layer modulation symbol carries.But in actual applications, the second transmission information that the extra play modulation symbol carries can be brought interference to the first transmission information that the basal layer modulation symbol carries.The first transmission information of carrying in the basal layer modulation symbol for the aircraft of winning is correctly demodulated, in the present embodiment, demodulator in first aircraft can adopt the posterior probability iterative algorithm of basal layer modulation symbol, detection and the demodulation result of extra play modulation symbol are fed back to demodulator, thereby the interference that the second transmission information of carrying in the reduction extra play modulation symbol is brought improves the performance that marginal zone aircraft demodulation first sends information.
Below utilize the posterior probability iterative algorithm demodulation first of basal layer modulation symbol to send information to first aircraft handling process be described in detail, Fig. 3 is the posterior probability iterative algorithm operation principle schematic diagram of the basal layer modulation symbol of embodiment of the invention application, as shown in Figure 3:
1, the logarithm posterior probability of calculation code bit.
Be example with layering 16QAM modulation system, under the situation of 16QAM modulation system, can use { b
1, b
2, b
3, b
44 coded-bits, wherein b among the information s of expression network equipment emission
1The expression highest order, b
4The expression lowest order, b
2An expression time high position, b
3Expression time low level; { b
1, b
2Formation base layer bit information flow, { b
3, b
4Formation extra play bit information flow.To b
j∈ 1, and-1}, j=1 ... 4, its logarithm posterior probability can calculate by following formula:
Wherein,
And
P
A(b
i) represent about b
iPrior information, can calculate by following formula:
Wherein,
For obtain by channel decoder about b
iThe logarithm prior probability of bit.
2, the outside posterior probability of the logarithm of calculation code bit.
With b
j∈ 1, and-1}, j=1 ... 4 is example, and the outside posterior probability of its logarithm is:
Further, order
And
3, to sequences of code bits correspondence
With
Sequence is carried out deinterleaving respectively.
4, to after the deinterleaving of sequences of code bits correspondence
With
Sequence is carried out channel decoding respectively.Can obtain the not decode results of coded-bit after the channel decoding, and the extra play decoding logarithm posterior probability information sequence corresponding with the basal layer sequences of code bits through obtaining after interweaving again
With
If the error performance of coded-bit does not reach default threshold value or maximum iteration time and reaches default thresholding times N, then export not coded-bit decode results, computational process stops.Otherwise, entered for the 5th step.
5, will
With
Return demodulator, namely returned for the 1st step and proceed the maximum a posteriori probability demodulation.
The above-mentioned iteration of posterior probability information between demodulator and channel decoder by each bit in the coded message, the bit error performance can get a promotion.
For second aircraft that is positioned at core space, because the received signal to noise ratio of second aircraft is higher, so the demodulator of second aircraft can detect the second transmission information that the first transmission information that the basal layer modulation symbol carries and extra play modulation symbol carry simultaneously.
But, the demodulation target of second aircraft is the second transmission information that the extra play modulation symbol carries, in like manner, the demodulator that second aircraft can feed back to second aircraft with detection and the demodulation result of basal layer modulation symbol, thereby the interference that the first transmission information of carrying in the reduction basal layer modulation symbol is brought, improve the performance of core space aircraft demodulating information, Fig. 4 is the posterior probability iterative algorithm operation principle schematic diagram of the extra play modulation symbol of embodiment of the invention application, the posterior probability iterative algorithm that is positioned at the extra play modulation symbol that second aircraft of core space adopts is similar with the posterior probability iterative algorithm of the basal layer modulation symbol that first aircraft that is positioned at the marginal zone adopts, and specific algorithm repeats no more.Difference is: the demodulator that the logarithm posteriority fiducial probability feedback information of detection and the basal layer symbol that demodulates need be returned second aircraft is proceeded the maximum a posteriori probability demodulation; If the error performance of coded-bit does not reach default threshold value or maximum iteration time and reaches default thresholding times N, then export not coded-bit decode results, detect and decoding thereby finish second enhancing that sends information that the extra play modulation symbol carries.
Need to prove, modulation system default in the embodiment of the invention is including, but not limited to 16QAM(4/4) hierarchical modulating method, further, can also adopt multiple hierarchical modulation mode, for example 64QAM(4/4/4 according to system's actual demand), 64QAM(4/16), 16QAM (2/8) etc.
The embodiment of the invention respectively is divided into marginal zone aircraft group and core space aircraft group according to the positional information of different aircraft with different aircraft by network equipment, afterwards, according to the pairing condition, the aircraft that will be positioned at the marginal zone matches with the aircraft that is positioned at core space, afterwards, use the basal layer modulation symbol to modulate the information that sends to the pairing aircraft that is positioned at the marginal zone, use the extra play modulation symbol to modulate the information that sends to the pairing aircraft that is positioned at core space, afterwards, the information after using identical Radio Resource with above-mentioned modulation sends to the pairing aircraft that is positioned at the marginal zone respectively and is positioned at the aircraft of core space.Further, the pairing aircraft that is positioned at the marginal zone can use the basal layer modulation symbol to demodulate corresponding information, and the aircraft that is positioned at core space can use the extra play modulation symbol to demodulate corresponding information.Thereby the low-order-modulated of basal layer of can using the pairing aircraft that can realize being positioned at the marginal zone realizes the reliable communication under the low received signal to noise ratio situation, and the pairing aircraft that is positioned at core space can use the low-order-modulated of extra play to realize reliable communication under the high received signal to noise ratio situation; Therefore, distribute to the Radio Resource of the pairing aircraft use of marginal zone and use multiplexingly for the pairing aircraft of core space, improved utilization ratio of wireless resources.
The embodiment of the invention can distribute more Radio Resource for flexibly the aircraft of marginal zone, and do not worry reducing whole civil aviaton vacant lot system of broadband wireless communication message capacity, this makes allocation of radio resources more flexible, has solved based on the waste of radio resources that exists in traditional vacant lot data transmission system and the lower problem of air communications capacity.
Need to prove, the aircraft matching method that adopts in the present embodiment is to upgrade according to the relative position real time altering of different aircraft, therefore, data flow between the different aircraft, distance or received signal to noise ratio according to the flying distance network equipment, can dynamically adjust combinations of pairs, this has brought bigger difficulty for illegally intercepting of unauthorized user, thereby improved the fail safe of civil aviaton's vacant lot system of broadband wireless communication, be particularly suitable for higher vacant lot, the broadband data chain business of safe class.
The structural representation of the vacant lot data transmission device that Fig. 5 provides for another embodiment of the present invention; Be applied to civil aviaton's vacant lot system of broadband wireless communication, be specifically as follows network equipment, as shown in Figure 5, the described vacant lot of present embodiment data transmission device specifically comprises:
Sending module 53, the first transmission information after being used for using identical Radio Resource with described modulation sends to described first aircraft, and the second transmission information after the described modulation is sent to described second aircraft.
For instance, sending module 53 is also for the basal layer modulation symbol that sends described default modulation system to described first aircraft, so that described first aircraft is according to the described first transmission information of the basal layer modulation symbol demodulation of described default modulation system;
Sending module 53 is also for the extra play modulation symbol that sends described default modulation system to described second aircraft, so that described second aircraft is according to the described second transmission information of the extra play modulation symbol demodulation of described default modulation system.
For instance, described device also comprises:
Ratio according to the energy of the energy of described basal layer modulation symbol and described extra play modulation symbol, determine to distribute to the energy of the basal layer modulation symbol in the same wireless resource that described first aircraft uses and distribute to the energy of the extra play modulation symbol in the same wireless resource that described second aircraft uses;
Sending module 53, the concrete energy that is used for using described basal layer modulation symbol, the first transmission information after the described modulation is sent to described first aircraft, use the energy of described extra play modulation symbol, the second transmission information after the described modulation is sent described second aircraft.
The embodiment of the invention respectively is divided into marginal zone aircraft group and core space aircraft group according to the positional information of different aircraft with different aircraft by network equipment, afterwards, according to the pairing condition, the aircraft that will be positioned at the marginal zone matches with the aircraft that is positioned at core space, afterwards, use the basal layer modulation symbol to modulate the information that sends to the pairing aircraft that is positioned at the marginal zone, use the extra play modulation symbol to modulate the information that sends to the pairing aircraft that is positioned at core space, afterwards, the information after using identical Radio Resource with above-mentioned modulation sends to the pairing aircraft that is positioned at the marginal zone respectively and is positioned at the aircraft of core space.Further, the pairing aircraft that is positioned at the marginal zone can use the basal layer modulation symbol to demodulate corresponding information, and the aircraft that is positioned at core space can use the extra play modulation symbol to demodulate corresponding information.Thereby the low-order-modulated of basal layer of can using the pairing aircraft that can realize being positioned at the marginal zone realizes the reliable communication under the low received signal to noise ratio situation, and the pairing aircraft that is positioned at core space can use the low-order-modulated of extra play to realize reliable communication under the high received signal to noise ratio situation; Therefore, distribute to the Radio Resource of the pairing aircraft use of marginal zone and use multiplexingly for the pairing aircraft of core space, improved utilization ratio of wireless resources.
The structural representation of the vacant lot data transmission system that Fig. 6 provides for another embodiment of the present invention is applied to civil aviaton's vacant lot system of broadband wireless communication, as shown in Figure 6, comprising: network equipment 61, first aircraft 62 and second aircraft 63; Wherein, described first aircraft is positioned at the marginal zone of the signal cover of described network equipment, and described second aircraft is positioned at the core space of the signal cover of described network equipment;
Wherein, network equipment 61 comprises the vacant lot data transmission device that embodiment as shown in Figure 5 provides, and detailed content repeats no more with reference to associated description in the vacant lot data transmission device that provides embodiment illustrated in fig. 5;
The associated content reference vacant lot data transmission method that provides embodiment illustrated in fig. 1 is put middle associated description, repeats no more.
The embodiment of the invention respectively is divided into marginal zone aircraft group and core space aircraft group according to the positional information of different aircraft with different aircraft by network equipment, afterwards, according to the pairing condition, the aircraft that will be positioned at the marginal zone matches with the aircraft that is positioned at core space, afterwards, use the basal layer modulation symbol to modulate the information that sends to the pairing aircraft that is positioned at the marginal zone, use the extra play modulation symbol to modulate the information that sends to the pairing aircraft that is positioned at core space, afterwards, the information after using identical Radio Resource with above-mentioned modulation sends to the pairing aircraft that is positioned at the marginal zone respectively and is positioned at the aircraft of core space.Further, the pairing aircraft that is positioned at the marginal zone can use the basal layer modulation symbol to demodulate corresponding information, and the aircraft that is positioned at core space can use the extra play modulation symbol to demodulate corresponding information.Thereby the low-order-modulated of basal layer of can using the pairing aircraft that can realize being positioned at the marginal zone realizes the reliable communication under the low received signal to noise ratio situation, and the pairing aircraft that is positioned at core space can use the low-order-modulated of extra play to realize reliable communication under the high received signal to noise ratio situation; Therefore, distribute to the Radio Resource of the pairing aircraft use of marginal zone and use multiplexingly for the pairing aircraft of core space, improved utilization ratio of wireless resources.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the protection range of various embodiments of the present invention technical scheme.
Claims (10)
1. a vacant lot data transmission method is applied to civil aviaton's vacant lot system of broadband wireless communication, it is characterized in that, comprising:
Network equipment is according to default pairing condition, determine second aircraft with the pairing of first aircraft, described first aircraft is positioned at the marginal zone of the signal cover of described network equipment, and described second aircraft is positioned at the core space of the signal cover of described network equipment;
Described network equipment uses the basal layer modulation symbol to modulate the first transmission information, uses the extra play modulation symbol to modulate the second transmission information, and described basal layer modulation symbol and described extra play modulation symbol belong to the different modulating symbol in the same modulation system;
The first transmission information after described network equipment uses identical Radio Resource with described modulation sends to described first aircraft, and the second transmission information after the described modulation is sent to described second aircraft.
2. method according to claim 1 is characterized in that, described network equipment is determined and second aircraft of first aircraft pairing according to default pairing condition, being comprised:
Described network equipment is positioned at the received signal to noise ratio of described first aircraft received signal to noise ratio of aircraft of core space of the signal cover of described network equipment respectively divided by all, get the ratio maximum of received signal to noise ratio, the aircraft of the core space of the signal cover that is positioned at described network equipment of the ratio maximum correspondence of described received signal to noise ratio is defined as second aircraft with described first aircraft pairing.
3. method according to claim 1 is characterized in that, described network equipment uses the basal layer modulation symbol to modulate the first transmission information, uses the extra play modulation symbol to modulate after the second transmission information, comprising:
Described network equipment sends described basal layer modulation symbol to described first aircraft, so that described first aircraft is according to the described first transmission information of described basal layer modulation symbol demodulation;
Described network equipment sends described extra play modulation symbol to described second aircraft, so that described second aircraft is according to the described second transmission information of described extra play modulation symbol demodulation.
4. method according to claim 1, it is characterized in that, the first transmission information after described network equipment uses the same wireless resource with described modulation sends to described first aircraft, and the second transmission information after the described modulation is sent to described second aircraft, specifically comprises:
Described network equipment is according to the received signal to noise ratio of described first aircraft and the received signal to noise ratio of described second aircraft, determines the ratio of the energy of the energy of described basal layer modulation symbol and described extra play modulation symbol;
Ratio according to the energy of the energy of described basal layer modulation symbol and described extra play modulation symbol, determine to distribute to the energy of the basal layer modulation symbol in the same wireless resource that described first aircraft uses and distribute to the energy of the extra play modulation symbol in the same wireless resource that described second aircraft uses;
Use the energy of described basal layer modulation symbol, the first transmission information after the described modulation is sent to described first aircraft, use the energy of described extra play modulation symbol, the second transmission information after the described modulation is sent described second aircraft.
5. method according to claim 3, it is characterized in that, the first transmission information after described network equipment uses the same wireless resource with described modulation sends to described first aircraft, and the second transmission information after the described modulation is sent to after described second aircraft, comprising:
The described basal layer modulation symbol that described first aircraft utilizes described network equipment to send carries out the described first transmission information of demodulation after the posterior probability iterative computation of described basal layer modulation symbol;
The described extra play modulation symbol that described second aircraft utilizes described network equipment to send carries out the described second transmission information of demodulation after the posterior probability iterative computation of described extra play modulation symbol.
6. a vacant lot data transmission device is applied to civil aviaton's vacant lot system of broadband wireless communication, it is characterized in that, comprising:
Matching module, be used for according to default pairing condition, determine second aircraft with the pairing of first aircraft, described first aircraft is positioned at the marginal zone of the signal cover of described network equipment, and described second aircraft is positioned at the core space of the signal cover of described network equipment;
Modulation module is used for using the basal layer modulation symbol to modulate the first transmission information, uses the extra play modulation symbol to modulate the second transmission information, and described basal layer modulation symbol and described extra play modulation symbol belong to the different modulating symbol in the same modulation system;
Sending module, the first transmission information after being used for using identical Radio Resource with described modulation sends to described first aircraft, and the second transmission information after the described modulation is sent to described second aircraft.
7. device according to claim 6, it is characterized in that, described matching module, the concrete received signal to noise ratio of aircraft of core space that is used for the received signal to noise ratio of described first aircraft is positioned at divided by all respectively the signal cover of described network equipment, get the ratio maximum of received signal to noise ratio, the aircraft of the core space of the signal cover that is positioned at described network equipment of the ratio maximum correspondence of described received signal to noise ratio is defined as second aircraft with described first aircraft pairing.
8. device according to claim 6 is characterized in that, described sending module also is used for sending described basal layer modulation symbol to described first aircraft, so that described first aircraft is according to the described first transmission information of described basal layer modulation symbol demodulation;
Described sending module also is used for sending described extra play modulation symbol to described second aircraft, so that described second aircraft is according to the described second transmission information of described extra play modulation symbol demodulation.
9. device according to claim 6 is characterized in that, also comprises:
Determination module is used for according to the received signal to noise ratio of described first aircraft and the received signal to noise ratio of described second aircraft, determines the ratio of the energy of the energy of described basal layer modulation symbol and described extra play modulation symbol;
Ratio according to the energy of the energy of described basal layer modulation symbol and described extra play modulation symbol, determine to distribute to the energy of the basal layer modulation symbol in the same wireless resource that described first aircraft uses and distribute to the energy of the extra play modulation symbol in the same wireless resource that described second aircraft uses;
Described sending module, the concrete energy that is used for using described basal layer modulation symbol, the first transmission information after the described modulation is sent to described first aircraft, use the energy of described extra play modulation symbol, the second transmission information after the described modulation is sent described second aircraft.
10. a vacant lot data transmission system is applied to civil aviaton's vacant lot system of broadband wireless communication, it is characterized in that, comprising: network equipment, first aircraft and second aircraft; Wherein, described first aircraft is positioned at the marginal zone of described network equipment signal cover, and described second aircraft is positioned at the core space of described network equipment signal cover;
Described network equipment comprises each described vacant lot data transmission device as claim 6-9;
Described first aircraft is used for the described basal layer modulation symbol utilize described network equipment to send, carries out the described first transmission information of demodulation after the posterior probability iterative computation of described basal layer modulation symbol;
Described second aircraft is used for the described extra play modulation symbol utilize described network equipment to send, carries out the described second transmission information of demodulation after the posterior probability iterative computation of described extra play modulation symbol.
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