CN102437872A - Device for constructing multi-path transmission condition between railway base station and train - Google Patents
Device for constructing multi-path transmission condition between railway base station and train Download PDFInfo
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- CN102437872A CN102437872A CN2011102263737A CN201110226373A CN102437872A CN 102437872 A CN102437872 A CN 102437872A CN 2011102263737 A CN2011102263737 A CN 2011102263737A CN 201110226373 A CN201110226373 A CN 201110226373A CN 102437872 A CN102437872 A CN 102437872A
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Abstract
The invention relates to a device for constructing a multi-path transmission condition between a railway base station and a train. The device comprises base station reflecting bodies arranged around base station antennae and train reflecting bodies arranged around train antennae, wherein one group of base station reflecting bodies are arranged around each base station antenna; and one group of train reflecting bodies are arranged around each train antenna. Compared with the prior art, the device provided by the invention can be used for effectively constructing the multi-path transmission condition of a multiple input multiple output (MIMO) system in an open railway environment and improving the signal transmission quality.
Description
Technical field
The present invention relates to areas of information technology, especially relate to a kind of device that is used for structure multi-path transmission condition between railway base station and train.
Background technology
Under the high-speed railway environment; In most cases the base station is placed on very near and be in the very little scope in dead ahead or the dead astern of running train apart from rail; Adding that railway communication environment along the line is relatively more spacious mostly, mainly is level terrain, and surface relief is less; Receiving signal like this is the stack of prevailing direct wave of direct wave and small reflection ripple, thereby forms the Rice decline with line-of-sight propagation.Under this environment, has very big correlation between the many antennas on base station or the train.And mimo system needs abundant as far as possible scattering environments in order to make that signal is uncorrelated between transmission or the reception antenna, and is separate as far as possible between a plurality of different dual-mode antenna links.
The Mathematical Modeling of the channel of mimo system can be formulated as: H=R
r 1/2H
wR
t 1/2
H wherein
wIn each element separate and obey the Gaussian distribution of unit variance, ()
1/2The special square root of expression ell rice.Matrix R
rDetermine the correlation of each row of H, be used to describe the correlation between each reception antenna; Matrix R
tDetermine the correlation of each row of H, be used to describe the correlation between each transmitting antenna.More satisfactory situation is correlation matrix R
rAnd R
tAll be proportional to unit matrix, all uncorrelated between each ranks of channel model H like this.
The wireless propagation environment of high-speed railway, reflector is less, and the direct projection path is dominant, the R among the channel H
rAnd R
tOrder very low (equaling 1), H
wEach element is the wall scroll direct projection footpath of confirming, is illustrated in fig. 1 shown below.Each element is all identical among the channel H like this.The derivation of equation can find out that mimo channel is degenerated to the SISO channel.The MIMO transmission is difficult to realization, perhaps poor.
Summary of the invention
The object of the invention is exactly for the defective that overcomes above-mentioned prior art existence a kind of device that is used for structure multi-path transmission condition between railway base station and train that can effectively increase transmission path to be provided.
The object of the invention can be realized through following technical scheme: a kind of device that is used for structure multi-path transmission condition between railway base station and train; It is characterized in that; This device comprises base station reflector and train reflector, and described base station reflector is located at around the antenna for base station, is provided with one group of base station reflector around every foundation station antenna; Described train reflector is located at around the train antenna, is provided with one group of train reflector around the every train antenna.After the signal that antenna for base station sends reflects through the base station reflector; Signal is increased at the transmission path of transmitting terminal; Signal through reflection is transferred to the different trains reflector through different paths; Through the reflection of train reflector, after receiving terminal further increases transmission path, receive again by the train antenna.
Be provided with dividing plate between described every group of base station reflector, isolate making the signal between every group of antenna for base station separate through dividing plate.
Described base station reflector is coated with the signal absorption coating, can absorb the signal from other base station reflectors.
The signal reflex direction of described base station reflector is all towards train; The signal of antenna for base station emission can not reflected between the reflector of base station each other; But independently after the base station reflector reflection once, directly arrive train through each, just there is not correlation between the transmission path of generation like this.
Compared with prior art, the present invention can effectively construct the multi-path transmission condition of mimo system under the Railway Environment of spaciousness, improves signal transmission quality.
Description of drawings
Fig. 1 is not for using signal transmission sketch map of the present invention;
Fig. 2 is for using signal transmission sketch map of the present invention;
Fig. 3 is the structural representation of train antenna among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment
Like Fig. 2, shown in 3; A kind of device that is used for structure multi-path transmission condition between railway base station and train, this device comprises base station reflector 31 and train reflector 11, each antenna for base station 3 is respectively equipped with one group of base station reflector 31 and train reflector 11 on every side with each train antenna 1; Be provided with dividing plate 2 between every group of base station reflector 31; Isolate through dividing plate 2, reduce by every group of signal transmission between the base station reflector 31, the surfaces coated of each base station reflector 31 is covered with the signal absorption coating; Can absorb signal, only reflect signal from antenna for base station 3 from other base station reflectors 31.The signal reflex direction of base station reflector 31 is all towards train; The signal of antenna for base station 3 emissions can not reflected between base station reflector 31 each other; But through each independently after base station reflector 31 reflection once; Directly arrive train, the correlation between the transmission path that produces so just reduces greatly, has improved transmission quality.
The transmission course of signal is: the signal of antenna for base station 3 emissions signal is increased at the transmission path of transmitting terminal, and the correlation between each transmission path is very low after reflecting through base station reflector 31.Signal through reflection is transferred to train reflector 11 through different paths, after 11 reflections further increase transmission path through the train reflector again, is received by train antenna 1.
In practice, base station reflector 31 is fixed with train reflector 11, therefore in the base station with train position definite after; Channel gain should be confirmed; And because the distance between reflector and the antenna is basic identical, therefore can not cause the temporal extension of signal, can not produce frequency selective fading like this; Can effectively construct the multi-path transmission condition of mimo system, improve signal transmission quality.
Claims (4)
1. device that is used between railway base station and train structure multi-path transmission condition; It is characterized in that; This device comprises base station reflector and train reflector, and described base station reflector is located at around the antenna for base station, is provided with one group of base station reflector around every foundation station antenna; Described train reflector is located at around the train antenna, is provided with one group of train reflector around the every train antenna.
2. a kind of device that is used for structure multi-path transmission condition between railway base station and train according to claim 1 is characterized in that, is provided with dividing plate between every group of base station reflector, isolates making the signal between every group of antenna for base station separate through dividing plate.
3. a kind of device that is used for structure multi-path transmission condition between railway base station and train according to claim 1 is characterized in that described base station reflector is coated with the signal absorption coating, can absorb the signal from other base station reflectors.
4. a kind of device that is used for structure multi-path transmission condition between railway base station and train according to claim 1 is characterized in that the signal reflex direction of described base station reflector is all towards train.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102263737A CN102437872A (en) | 2011-08-09 | 2011-08-09 | Device for constructing multi-path transmission condition between railway base station and train |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102263737A CN102437872A (en) | 2011-08-09 | 2011-08-09 | Device for constructing multi-path transmission condition between railway base station and train |
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| Publication Number | Publication Date |
|---|---|
| CN102437872A true CN102437872A (en) | 2012-05-02 |
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| CN2011102263737A Pending CN102437872A (en) | 2011-08-09 | 2011-08-09 | Device for constructing multi-path transmission condition between railway base station and train |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253314A (en) * | 2013-06-28 | 2014-12-31 | 耀登科技股份有限公司 | Mobile communication antenna system and antenna module thereof |
| WO2016161624A1 (en) * | 2015-04-10 | 2016-10-13 | 华为技术有限公司 | Data transmission method and device |
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|---|---|---|---|---|
| US20050020313A1 (en) * | 2003-07-26 | 2005-01-27 | Samsung Electronics Co., Ltd. | System and method for transmitting and receiving a signal in a mobile communication system using a multiple input multiple output adaptive antenna array scheme |
| CN101594661A (en) * | 2008-05-27 | 2009-12-02 | 大唐移动通信设备有限公司 | A kind of method of downlink transmission, system, base station and subscriber equipment |
| US20100290395A1 (en) * | 2009-04-15 | 2010-11-18 | Research In Motion Ltd | Sensor-based wireless communication systems using compressive sampling |
| CN102130866A (en) * | 2011-04-08 | 2011-07-20 | 上海大学 | Self-adoption precoding method for multi-input multi-output (MIMO) system in rapid transit railway environment |
-
2011
- 2011-08-09 CN CN2011102263737A patent/CN102437872A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050020313A1 (en) * | 2003-07-26 | 2005-01-27 | Samsung Electronics Co., Ltd. | System and method for transmitting and receiving a signal in a mobile communication system using a multiple input multiple output adaptive antenna array scheme |
| CN101594661A (en) * | 2008-05-27 | 2009-12-02 | 大唐移动通信设备有限公司 | A kind of method of downlink transmission, system, base station and subscriber equipment |
| US20100290395A1 (en) * | 2009-04-15 | 2010-11-18 | Research In Motion Ltd | Sensor-based wireless communication systems using compressive sampling |
| CN102130866A (en) * | 2011-04-08 | 2011-07-20 | 上海大学 | Self-adoption precoding method for multi-input multi-output (MIMO) system in rapid transit railway environment |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253314A (en) * | 2013-06-28 | 2014-12-31 | 耀登科技股份有限公司 | Mobile communication antenna system and antenna module thereof |
| WO2016161624A1 (en) * | 2015-04-10 | 2016-10-13 | 华为技术有限公司 | Data transmission method and device |
| US10270499B2 (en) | 2015-04-10 | 2019-04-23 | Huawei Technologies Co., Ltd. | Data transmission method and device |
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Application publication date: 20120502 |