CN101060357A - Single frequency network signal line style coverage method for rail traffic - Google Patents
Single frequency network signal line style coverage method for rail traffic Download PDFInfo
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- CN101060357A CN101060357A CNA2007100417132A CN200710041713A CN101060357A CN 101060357 A CN101060357 A CN 101060357A CN A2007100417132 A CNA2007100417132 A CN A2007100417132A CN 200710041713 A CN200710041713 A CN 200710041713A CN 101060357 A CN101060357 A CN 101060357A
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Abstract
The disclosed single-frequency network signal line type coverage method for rail traffic refers to idea of overlay area reverse displacement, wherein in receiver, using two directional antenna and modems for signal processing; to every antenna, the overlay area moves toward the reverse direction of antenna main-lobe direction; receiver uses proper algorithm to incorporate the demodulated two-path signal for removing the overlay area. This invention models the coverage area to optimize the antenna parameters, therefore improves system link design index obviously.
Description
Technical field
What the present invention relates to is the signal coverage method in a kind of telecommunication technology field, particularly a kind of single frequency network signal line style coverage method that is used for track traffic.
Background technology
Along with the development that digital technology is maked rapid progress, field of broadcast televisions is being faced with a new revolution, and the every field relevant with broadcast television technique is all to digitlization direction high speed development.The developing rapidly of digital television techniques makes watches that in high-speed mobile environment stable digital broadcast program becomes possibility.In recent years, significantly dilatation and speed-raising along with railway, select the train trip to become more and more masses' selection, yet owing to also do not build up the digital broadcasting nerve of a covering that is used for track traffic at present, thousands of trains that are distributed on the rail become the blind area that digital broadcasting covers, the millions of passengers that take train every day dull can't watch digital broadcast program during the journey very long, and this forms huge contrast with flourishing at present IT industry; Therefore the broadcast singal covering problem that solves in the field of track traffic that comprises railway becomes the task of top priority.
Digital broadcasting single frequency network technology (SFN) is the best-of-breed technology that is used for the digital broadcasting nerve of a covering of track traffic, mainly needs to solve following two problems in design track traffic single frequency network signal covers: the coverage effect that 1) guarantees the SFN crossover region; 2) 1) prerequisite under effectively utilize power that power is carried out in the target coverage zone to cover; So-called crossover region is meant under the single frequency network coverage condition, receives two (or more than) base station signals, and two (or more than) signal strength differences are less than the coated region of certain given range or value (being made as X).Crossover region normally covers the field intensity small region, and receiver is when crossover region is worked, and demodulator is operated in the environment of strong multipath (multipaths each other that transmit of two or more base stations), has extra signal-to-noise ratio degradation.
Find through literature search prior art, document " Single Frequency Networks in DTV " (IEEE Transactions on Broadcasting, Vol.51, No.4, December 2005) terrestrial television single frequency network method has been carried out research and analysis, and some design experiences, method and the criterion of covering problem have been proposed to solve, these covering methods are applied to the terrestrial television SFN design in city, suburb usually, and the target area of wireless coverage is for circle or be referred to as planar covering.Because the target area that track traffic covers is for along the stripe shape of track or be referred to as linear regions, the coverage goal of the therefore aforesaid linear regions that is not suitable for track traffic at the SFN covering design method and the criterion of planar covering; Also find in the retrieval, patent " antenna allocation method that is used for the highway wireless coverage " (number of patent application 200410080166.5) discloses a kind of antenna allocation method that is used for the highway wireless coverage in field of wireless communications systems, this method is utilized the strip characteristic of coated region, adopt two directional antennas to carry out rightabout covering, thereby can effectively improve the utilization ratio of power, this method thinking has certain significance for reference to track traffic SFN covering design, but the application background of this method is not SFN in essence, therefore do not consider of the specific (special) requirements of single frequency network crossover region to covering design, the signal to noise ratio of the receiver in the area of coverage not only depends on the signal strength that receiver is received, also with to cover the signal-to-noise ratio degradation that crossover region brings relevant, and at crossover region because all far away apart from the transmitter at two ends, signal strength is minimum in the whole area of coverage.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of single frequency network signal line style coverage method that is used for track traffic is provided, make its monochromatic network signal overlapping area that solves the track traffic class cause signal-to-noise ratio degradation, crossover region field intensity normally minimum problem in the area of coverage simultaneously, overcome of the influence of track traffic class monochromatic network signal overlapping area, improved the system link design objective greatly the signal covering design.
The present invention is achieved by the following technical solutions, and the present invention proposes " the reverse displacement of crossover region " thought, realizes the single frequency network covering design of track traffic class, specifically comprises the steps:
1) adopt two directional antennas and two demodulators to carry out signal in receiver and receive and demodulation, for each directional receiving antenna, crossover region moves to the opposite direction of antenna main lobe direction;
In the receiver, two directional receiving antennas are presented the signal that receives respectively to two demodulators; Two demodulators information of demodulation output separately are input to diversity and merge device; Diversity merges device by selecting merge algorithm output optimum signal.
Two directional receiving antennas than parameters R, are selected big as far as possible value before and after it.
As R during greater than crossover region field intensity difference X, then there is not crossover region in described parameters R.
2) receiver to demodulation after two paths of signals merge by selecting merge algorithm, reach the purpose of eliminating crossover region;
3) transmitting antenna of each base station adopts two directional antenna definite object areas of coverage to carry out the emission of single frequency network signal;
4) line style is carried out in the single frequency network covering of track traffic class and cover modeling, and on this model basis, transmitting antenna parameter main lobe width θ and antenna directional angle φ are disposed.
To the transmitting antenna parameter configuration, may further comprise the steps:
1) with θ, φ is a parameter, is independent variable with l, and obtaining the field intensity that interior first directional receiving antenna receives between two adjacent base station overlay areas is E
R1(l; θ, φ), the field intensity that second directional receiving antenna receives is E
R2(l; θ, φ);
2) back of the body back noise of receiver and received field strength are irrelevant, then according to 1) in the expression formula of received signal to noise ratio of two demodulators of field intensity expression formula when not considered the crossover region signal-to-noise ratio degradation be respectively SNR
R1(l; θ, φ) and SNR
R2(l; θ, φ);
3) according to the definition of crossover region by 1) in E
R1(l; θ, φ), E
R2(l; θ, φ) expression formula obtains the l interval of crossover region correspondence, obtains relationship delta SNR (the Δ E of signal-to-noise ratio degradation and field intensity difference according to the modulation system of system's employing
r), and replacement obtains Δ SNR (l);
4) obtain the expression formula SNR of two demodulator actual reception signal to noise ratios
R1(l; θ, φ) and SNR
R2(l; θ, φ);
5) be SNR by the received signal to noise ratio performance behind the diversity merging device
Final=max{SNR
R1(l; θ, φ), SNR
R2(l; θ, φ) }, consider wherein signal to noise ratio minimum point, min{SNR
FinaL}=min{max{SNR
R1(θ, φ, l), SNR
R2(θ, φ, l) } };
6) adjust and selected transmitting antenna parameter θ and φ, make min{SNR
FinalMaximum.
Consider the line style characteristic distributions that the track traffic single frequency network covers, the present invention utilizes the directed antenna of sending out to improve covering efficient, at receiving terminal, the characteristics of utilizing the reception directional antenna that forward signal is strengthened and backward signal being suppressed make crossover region move to the opposite direction of directional antenna main lobe direction, and crossover region length effectively reduces, receiver to demodulation after two paths of signals merge by selecting the diversity merge algorithm, from the received signal field strength pattern of receiver equivalence, can eliminate the influence of crossover region to receiver.Compared with prior art, the invention has the beneficial effects as follows: can overcome of the influence of track traffic class monochromatic network signal overlapping area the signal covering design by these steps, different according to concrete applied environment and execution mode have the improvement of 5～8dB to the system link design objective.
Description of drawings
Fig. 1 adopts the signal strength distribution map between two base stations that have now under omnidirectional antenna and the directional antenna situation for transmitting antenna;
The receiver structure schematic diagram that Fig. 2 adopts for the embodiment of the invention;
Fig. 3 is the signal strength distribution map between two base stations of the embodiment of the invention;
Fig. 4 is after the embodiment of the invention merges device by diversity, the received signal field strength pattern of receiver equivalence;
Fig. 5 is the single frequency network line style overlay model figure of embodiment of the invention track traffic class;
Fig. 6 covers schematic diagram for embodiment of the invention Shanghai to 3 of Suzhou test sections;
Fig. 7 moves design sketch for embodiment of the invention crossover region.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
As shown in Figure 1, do not reflected when using the inventive method at transmitting antenna and adopted under the situation of omnidirectional antenna and directional antenna, the signal strength distribution map between two base stations, solid line is represented the omnidirectional antenna effect among the figure, dotted line is represented the directional antenna effect.Equate two transmitting base station transmitting powers, under the situation of antenna parameter unanimity, can see that crossover region is positioned at the centre of the area of coverage, be arranged in the minimum part of whole area of coverage signal strength; Crossover region is that omnidirectional is constant with directed condition upper/lower positions at transmitting antenna, and the field intensity integral body of the area of coverage has improved when just adopting directional antenna.
As shown in Figure 2, receiver 60 structures that present embodiment adopts comprise two directional receiving antennas 61,62, two demodulators 63,64, one diversity merge the signal that device 65, the first directional receiving antennas 61 receive and present to first demodulator 63, the signal that second directional receiving antenna 62 receives is presented to the output of 64, two demodulators 63 of second demodulator and 64 and is handled back output by diversity merging device 65.
The front and back of two directional receiving antennas 61,62 are R than parameter, and this parameter should be selected big as far as possible value under the attainable prerequisite of engineering, as R during greater than crossover region field intensity difference X, then do not have crossover region.First directional receiving antenna 61 is when the area of coverage moves, and the signal strength of output distributes as shown in Figure 3, and compared to Figure 1, crossover region moves to the opposite direction (to the right) that antenna main lobe points to; Second directional receiving antenna 62 is when the area of coverage moves, the signal strength of output distributes and Fig. 3 gets symmetry, and compared to Figure 1, crossover region moves to the opposite direction (left) that antenna main lobe points to, and the effect that move when bigger more than R the front and back of two directional receiving antennas 61,62 is obvious more.
The course of work of present embodiment receiver 60 is as follows, 21) two directional receiving antennas 61 and 62 are presented the signal that receives respectively to two demodulators 63 and 64; 22) two demodulators 63 and 64 separately the information of demodulation output be input to diversity and merge device 65; 23) diversity merges device 65 by selecting merge algorithm output optimum signal.
Behind diversity merging device 65, the received signal field intensity of receiver 60 equivalences as shown in Figure 4, the work field intensity of final receiver 60 is retouched out with thick line, when receiver 60 half section when mobile on a left side, receiver is according to first directional receiving antenna 61 and the output of first demodulator 63, and when receiver 60 on the right side half section when mobile, receiver 60 is according to second directional receiving antenna 62 and 64 outputs of second demodulator, when R＞X, then there is not crossover region in this state.
The base station transmitting antenna comprises for the directional antenna parameter: the main lobe width θ of transmitting antenna, antenna level are pointed to the included angle with track vertical line D;
As shown in Figure 5, the single frequency network line style overlay model figure of track traffic class, if the distance between adjacent two transmitting base stations is 2L, the distance of transmitting base station and track is D, and the main lobe width of transmitting antenna is θ, and the antenna level is pointed to and the angle of D is φ, the vertical line intersection point of base station, the left side and track is an initial point, the distance of receiver and initial point is l, and L in real system, D are set-point;
The detailed process of the transmitting antenna parameter being carried out the optimization configuration on the basis of considering the crossover region signal-to-noise ratio degradation comprises:
41) with θ, φ is a parameter, is independent variable with l, and can obtain the field intensity that interior first directional receiving antenna 61 receives between two adjacent base station overlay areas is E
R1(l; θ, φ), the field intensity that second directional receiving antenna 62 receives is E
R2(l; θ, φ);
42) back of the body back noise of receiver and received field strength are irrelevant, then according to 41) in the expression formula of received signal to noise ratio of two demodulators 63,64 of field intensity expression formula when not considered the crossover region signal-to-noise ratio degradation be respectively SNR
R1(l; θ, φ) and SNR
R2(l; θ, φ);
43) according to the definition of crossover region by 41) in E
R1(l; θ, φ), E
R2(l; θ, φ) expression formula obtains the l interval of crossover region correspondence, obtains relationship delta SNR (the Δ E of signal-to-noise ratio degradation and field intensity difference according to the modulation system of system's employing
r), and replacement obtains Δ SNR (l);
44) obtain the expression formula SNR of two demodulator 63,64 actual reception signal to noise ratios
R1(l; θ, φ) and SNR
R2(l; θ, φ);
45) be SNR by the received signal to noise ratio performance behind the diversity merging device 65
Final=max{SNR
R1(l; θ, φ), SNR
R2(l; θ, φ) }, consider wherein signal to noise ratio minimum point, min{SNR
Final}=min{max{SNR
R1(θ, φ, l), SNR
R2(θ, φ, l) } };
46) adjust and selected transmitting antenna parameter θ and φ, make min{SNR
FinalMaximum.
As shown in Figure 6, with the embodiment of Shanghai to 3 coverings of Suzhou test section, three transmitting base station positions are positioned at the outer pool of striding of Suzhou, Shanghai-Nanjing Railway Line section, only booth and just instrument station, transmitting base station evenly distributes, and spacing is 9 kilometers (being that 2L is 9Km), and the vertical line distance D of base station and track is 10 meters; System adopts the ADTB-T modulation system of Shanghai Communications University, this system has the ability of anti-strong multipath signal, multipath signal and main footpath signal strength signal intensity differ 10dB when above multipath signal demodulator is not had influence substantially, therefore the area of coverage field intensity difference X of native system is 10dB, the debit of receiver is to antenna 61 and 62 restrictions according to antenna type and actual installation size, and the index than D before and after it has reached 25dB on the big design principle of trying one's best.
When adopting free space decline model, quantitative analysis is carried out to the signal coverage varies between the positive instrument station in booth station only according to above parameter.With the corresponding railway coordinate position in booth station only is 0 point, the corresponding railway coordinate position in positive instrument station is 9000m, field intensity was carried out normalization when area of coverage field intensity adopted omnidirectional antenna by the initial point place, as shown in Figure 7, the crossover region scope is [2160m～6840m] when receiving end adopts omnidirectional antenna, crossover region length is 4680m, and the crossover region field strength range is [53.06dBc～-49.69dBc]; When adopting directional antenna, the crossover region scope of antenna 61 correspondences is [7640～8840], and crossover region length is 1200m, and the crossover region field strength range is [45.16dBc～-36.6dBc]; The length of antenna 62 correspondences and field strength range and antenna 61 are duplicate, the crossover region scope symmetry of its crossover region scope and antenna 61, be [160～1360], in the present embodiment, crossover region length is reduced into original 1/4, crossover region move effect obviously and crossover region working point minimum field strength improved 8dB, merge device 65 back equivalences through demodulator 63,64 and diversity and be no crossover region.
On subjective effect, before adopting present embodiment, receiver adopts single omnidirectional antenna received signal, when train when crossover region moves, the frequent losing lock of demodulator, it is interrupted to receive image, the painted screen phenomenon is obvious, after adopting present embodiment, demodulator signal to noise ratio all more than 11dB (thresholding is 5dB) in the whole area of coverage, image links up not have and interrupts.
From the foregoing description explanation, the present invention provides the ground nerve of a covering can adapt to effective covering requirement that different digital television transfer systems is finished high-speed railway.This nerve of a covering equally also can be applied to other field of track traffic simultaneously, is used for effective covering of digital television signal.
Claims (6)
1, a kind of single frequency network signal line style coverage method that is used for track traffic is characterized in that, specifically comprises the steps:
1) adopt two directional antennas and two demodulators to carry out signal in receiver and receive and demodulation, for each directional receiving antenna, crossover region moves to the opposite direction of antenna main lobe direction;
2) receiver to demodulation after two paths of signals merge by selecting merge algorithm, reach the purpose of eliminating crossover region;
3) transmitting antenna of each base station adopts two directional antenna definite object areas of coverage to carry out the emission of single frequency network signal;
4) single frequency network of track traffic class is covered carry out line style and cover modeling, and on this model basis to the transmitting antenna parameter configuration.
2, the single frequency network signal line style coverage method that is used for track traffic according to claim 1 is characterized in that, described antenna parameter is meant: main lobe width θ and antenna directional angle φ.
3, the single frequency network signal line style coverage method that is used for track traffic according to claim 1 is characterized in that, in the described receiver, two directional receiving antennas are presented the signal that receives respectively to two demodulators; Two demodulators information of demodulation output separately are input to diversity and merge device; Diversity merges device by selecting merge algorithm output optimum signal.
According to claim 1 or the 3 described single frequency network signal line style coverage methods that are used for track traffic, it is characterized in that 4, described two directional receiving antennas than parameters R, are selected big as far as possible value before and after it.
5, the single frequency network signal line style coverage method that is used for track traffic according to claim 4 is characterized in that, as R during greater than crossover region field intensity difference X, then there is not crossover region in described parameters R.
6, the single frequency network signal line style coverage method that is used for track traffic according to claim 1 is characterized in that, and is described to the transmitting antenna parameter configuration, may further comprise the steps:
1) with θ, φ is a parameter, is independent variable with l, and obtaining the field intensity that interior first directional receiving antenna receives between two adjacent base station overlay areas is E
R1(l; θ, φ), the field intensity that second directional receiving antenna receives is E
R2(l; θ, φ);
2) back of the body back noise of receiver and received field strength are irrelevant, then according to 1) in the expression formula of received signal to noise ratio of two demodulators of field intensity expression formula when not considered the crossover region signal-to-noise ratio degradation be respectively SNR
R1(l; θ, φ) and SNR
R2(l; θ, φ);
3) according to the definition of crossover region by 1) in E
R1(l; θ, φ), E
R2(l; θ, φ) expression formula obtains the l interval of crossover region correspondence, obtains relationship delta SNR (the Δ E of signal-to-noise ratio degradation and field intensity difference according to the modulation system of system's employing
r), and replacement obtains Δ SNR (l);
4) obtain the expression formula SNR of two demodulator actual reception signal to noise ratios
R1(l; θ, φ) and SNR
R2(l; θ, φ);
5) be SNR by the received signal to noise ratio performance behind the diversity merging device
Final=max{SNR
R1(l; θ, φ), SNR
R2(l; θ, φ) }, consider wherein signal to noise ratio minimum point, min{SNR
Final}=min{max{SNR
R1(θ, φ, l), SNR
R2(θ, φ, l) } };
6) adjust and selected transmitting antenna parameter θ and φ, make min{SNR
FinalMaximum.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101959261A (en) * | 2009-07-20 | 2011-01-26 | 中国移动通信集团公司 | Signal selection method and equipment in high-speed moving scene |
| CN101562858B (en) * | 2008-04-18 | 2011-04-13 | 大唐移动通信设备有限公司 | User access method and device thereof |
| CN102469540A (en) * | 2010-11-17 | 2012-05-23 | 深圳国人通信有限公司 | Cell switching method for communication signals in high-speed railway carriages |
| CN102469469A (en) * | 2010-11-17 | 2012-05-23 | 深圳国人通信有限公司 | Vehicle-mounted double-channel correcting repeater |
| CN101515669B (en) * | 2009-03-26 | 2012-07-18 | 上海交通大学 | Railway TV monochromatic network multiaerial system |
| CN103117789A (en) * | 2011-11-16 | 2013-05-22 | 中兴通讯股份有限公司 | Method and device for macro diversity reception |
| CN105471489A (en) * | 2015-11-13 | 2016-04-06 | 中国电子科技集团公司第五十四研究所 | Realization method of selective diversity combining |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101562858B (en) * | 2008-04-18 | 2011-04-13 | 大唐移动通信设备有限公司 | User access method and device thereof |
| CN101515669B (en) * | 2009-03-26 | 2012-07-18 | 上海交通大学 | Railway TV monochromatic network multiaerial system |
| CN101959261A (en) * | 2009-07-20 | 2011-01-26 | 中国移动通信集团公司 | Signal selection method and equipment in high-speed moving scene |
| CN101959261B (en) * | 2009-07-20 | 2013-07-31 | 中国移动通信集团公司 | Signal selection method and equipment in high-speed moving scene |
| CN102469540A (en) * | 2010-11-17 | 2012-05-23 | 深圳国人通信有限公司 | Cell switching method for communication signals in high-speed railway carriages |
| CN102469469A (en) * | 2010-11-17 | 2012-05-23 | 深圳国人通信有限公司 | Vehicle-mounted double-channel correcting repeater |
| CN103117789A (en) * | 2011-11-16 | 2013-05-22 | 中兴通讯股份有限公司 | Method and device for macro diversity reception |
| CN105471489A (en) * | 2015-11-13 | 2016-04-06 | 中国电子科技集团公司第五十四研究所 | Realization method of selective diversity combining |
| CN105471489B (en) * | 2015-11-13 | 2018-10-09 | 中国电子科技集团公司第五十四研究所 | A kind of implementation method of selective diversity combining |
| CN111669776A (en) * | 2020-05-22 | 2020-09-15 | 中国联合网络通信集团有限公司 | Method and device for determining edge rate |
| CN111669776B (en) * | 2020-05-22 | 2023-05-30 | 中国联合网络通信集团有限公司 | Edge rate determining method and device |
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