CN1516355A - Method and system for overcoming microwave digital transmission receiving blind point due to multipath interference - Google Patents
Method and system for overcoming microwave digital transmission receiving blind point due to multipath interference Download PDFInfo
- Publication number
- CN1516355A CN1516355A CNA031147836A CN03114783A CN1516355A CN 1516355 A CN1516355 A CN 1516355A CN A031147836 A CNA031147836 A CN A031147836A CN 03114783 A CN03114783 A CN 03114783A CN 1516355 A CN1516355 A CN 1516355A
- Authority
- CN
- China
- Prior art keywords
- antenna
- receiver
- normal
- controller
- selector switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to a method to overcome microwave digital transmission-reception blindness caused by multipath interference, its character: the microware channel select switch adopts queuing administration, and the microwave digital transmission-reception system includes: N antennas, microware channel select switch, controller and relative software, a set of receiver and terminal device.
Description
Technical field
The present invention relates to a kind of method and system that the multipath interference causes Digital Microwave transmission reception blind spot that overcome, be used for the real time information of transmission of video image, belong to Digital Microwave transmission reception technique field.
Background technology
Application with leaky cable transmission broadband Digital Microwave information technology is increasingly extensive, as is used for the transmitting video image real time information, just needs higher transmission code speed.
Wireless signal can produce reflection when running into barrier after emitting from information source, and a plurality of signals that arrive receiver via different paths can form interference owing to having nothing in common with each other at aspects such as signal strength signal intensity, frequency distortion and transmission delays.
Leaky cable is to utilize to offer the wireless signal that gap radiation goes out certain energy on the coaxial cable outer conductor, because the energy of the wireless signal that different gap radiations come out has nothing in common with each other, the time delays that arrives receiver is also different, the influence of other object reflected signals around adding is easy to form multipath and disturbs.
System for the low bit rate rate, can not cause the deterioration of transmission error rates, system to the high-transmission bit rate then can cause increasing of the error rate, cause digital information correctly to reduce, form and receive blind spot, in actual applications, because site environment can not be a free space, although it is closer generally using the occasion reception antenna of leaky cable and the distance between the leaky cable, usually at 1-10 λ, even like this, other objects are to the reflection of microwave, diffraction, scattering also can cause multipath to a certain degree to disturb, and makes the fuzzy even interruption of transmitting video image, and it is that two antennas and two overlap receiver and terminal equipments that the present abroad method that adopts is to use two cover Digital Microwave to transmit receiving systems, though overcoming the multipath interference, this method causes that the Digital Microwave transmission receives blind spot, expense costliness.
Summary of the invention
The objective of the invention is to invent that a kind of circuit is easy to make, cost saving, effective overcome multipath and disturb and cause that the Digital Microwave transmission receives the method and system of blind spot.
For realizing above purpose, technical scheme of the present invention provides a kind of method that the multipath interference causes Digital Microwave transmission reception blind spot that overcomes, and its characteristics are that the microwave channel selector switch adopts the queuing management method, and its method of reseptance comprises:
(1) N antenna, controller and microwave channel selector switch are installed on the basis of original equipment;
(2) controller is put the microwave channel selector switch at random in a certain position, and promptly antenna 1;
(3) receiver receives signal and judges, if incoming level is normal, the signal reduction is normal, then keeps antenna 1 operating state;
(4) if incoming level is normal, the signal reduction is undesired, selects next road antenna 2;
(5) if judge that at the position of antenna 2 receiver incoming level is normal, the signal reduction is normal, then keeps the operating state of antenna 2;
(6) if in the position of antenna 2, incoming level is normal, and the signal reduction is undesired, then selects next road antenna 3, arrives antenna N by that analogy;
(7) if judge that at the position of antenna N receiver incoming level is normal, the signal reduction is undesired, then switches to antenna 1, so repeatedly circulation.
2. use the required Digital Microwave transmission receiving system of this method to comprise:
(1) N antenna;
(2) microwave channel selector switch;
(3) controller and related software;
(4) one cover receiver and terminal equipments.
The microwave channel selector switch is connected in N antenna, receiver and controller simultaneously, and the other end of controller is connected in receiver, and the other end of receiver is connected in terminal equipment.
Be installed on a plurality of antennas of diverse location, its residing zone is different, the influence that multipath disturbs also has nothing in common with each other, very little for the probability that receives in the blind spot simultaneously, just can overcome the reception blind spot, the present invention adopts a plurality of antennas, can be less reaches equally with a cover receiver and terminal equipment to overcome multipath and disturb and cause that the Digital Microwave transmission receives the effect of blind spot.
Advantage of the present invention is that circuit is easy to make, cost saving, effective.
Description of drawings:
Fig. 1 is Digital Microwave transmission receiving system figure;
Fig. 2 is the director demon flow chart.
Embodiment:
As shown in Figure 1, be Digital Microwave transmission receiving system figure,
It comprises:
(1) N antenna;
(2) microwave channel selector switch;
(3) controller and related software;
(4) one cover receiver and terminal equipments.
As shown in Figure 2, be the director demon flow chart, with pulse or high-low level output a control signal to the microwave channel selector switch, the microwave channel selector switch is selected No. one antenna arbitrarily; Receiver receives signal to be judged, if incoming level is normal, the signal reduction is normal, then keeps this road antenna operating state; If incoming level is normal, the signal reduction is undesired, selects next road antenna; If judge that at the position of next road antenna receiver incoming level is normal, the signal reduction is normal, then keeps the operating state of next road antenna; If in the position of next road antenna, incoming level is normal, and the signal reduction is undesired, selects next road antenna again, as exceeds the antenna amount upper limit, then gets back to first via antenna, so repeatedly circulation.
Embodiment:
Be example now with transmitting video image on the subway train:
Designing antenna battle array at first, choose 3 antennas, 3 antennas are not distributed point-blank, distance between each antenna should be avoided the integral multiple of λ/2, these 3 antennas, microwave channel selector switch, controller and related software, a cover receiver and a terminal equipment are installed in the lower end of subway train then, at the other leaky cable of installing of rail, microwave channel selector switch one end is connected in N antenna, one end is connected in receiver, the other end is connected in controller, the other end of controller is connected in receiver, and receiver is connected in terminal equipment.In the subway train drive chamber display is installed, controller and related software are according to the cycling of director demon flow process, and the driver can see the required image of seeing in display, can not interrupt.
Claims (3)
1. one kind overcomes the method that the multipath interference causes Digital Microwave transmission reception blind spot, it is characterized in that the microwave channel selector switch adopts the queuing management method, and its method of reseptance comprises:
(1) N antenna, controller and microwave channel selector switch are installed on the basis of original equipment;
(2) controller is put the microwave channel selector switch in a certain position at random, and promptly antenna 1;
(3) receiver receives signal and judges, if incoming level is normal, the signal reduction is normal, then keeps antenna 1 operating state;
(4) if incoming level is normal, the signal reduction is undesired, then selects next road antenna 2;
(5) if judge that at the position of antenna 2 receiver incoming level is normal, the signal reduction is normal, then keeps the operating state of antenna 2;
(6) if in the position of antenna 2, incoming level is normal, and the signal reduction is undesired, then selects next road antenna 3, arrives antenna N by that analogy;
(7) if judge that at the position of antenna N receiver incoming level is normal, the signal reduction is undesired, then switches to antenna 1, so repeatedly circulation.
2. use the required Digital Microwave transmission receiving system of this method to comprise:
(1) N antenna;
(2) microwave channel selector switch;
(3) controller and related software;
(4) one cover receiver and terminal equipments.
The microwave channel selector switch is connected in N antenna, receiver and controller simultaneously, and the other end of controller is connected in receiver, and the other end of receiver is connected in terminal equipment.
3. Digital Microwave transmission receiving system according to claim 2 is characterized in that a described N antenna does not distribute point-blank, and the distance between each antenna should be avoided the integral multiple of λ/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031147836A CN100471087C (en) | 2003-01-08 | 2003-01-08 | Method and system for overcoming microwave digital transmission receiving blind point due to multipath interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031147836A CN100471087C (en) | 2003-01-08 | 2003-01-08 | Method and system for overcoming microwave digital transmission receiving blind point due to multipath interference |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1516355A true CN1516355A (en) | 2004-07-28 |
| CN100471087C CN100471087C (en) | 2009-03-18 |
Family
ID=34239398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031147836A Expired - Fee Related CN100471087C (en) | 2003-01-08 | 2003-01-08 | Method and system for overcoming microwave digital transmission receiving blind point due to multipath interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100471087C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104690A (en) * | 2017-04-11 | 2017-08-29 | 无锡睿思凯科技股份有限公司 | A kind of microwave receiver and its multiple antennas switched diversity method of reseptance |
-
2003
- 2003-01-08 CN CNB031147836A patent/CN100471087C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107104690A (en) * | 2017-04-11 | 2017-08-29 | 无锡睿思凯科技股份有限公司 | A kind of microwave receiver and its multiple antennas switched diversity method of reseptance |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100471087C (en) | 2009-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6744823B1 (en) | Communication system between road and vehicle | |
| CN1195339C (en) | Receiving antenna of broadcast television for bus | |
| AU2010209277B2 (en) | Low energy radar system | |
| CN109490889B (en) | Vehicle-mounted radar and method and device for judging whether vehicle-mounted radar is shielded or not | |
| CN1218189C (en) | Method and apparatus for determining a direction of arrival of signal | |
| EP2690708B1 (en) | Phase adjustment device and multi-frequency antenna | |
| CN102116860A (en) | Apparatus and sensor for adjusting sensor vertical alingment | |
| CN114449535B (en) | Signal transmission method, device, system, equipment and storage medium | |
| CN1572046A (en) | Method and apparatus for increasing the number of strong eigenmodes in a multiple-input multiple-output (mimo) radio channel | |
| CN103972655B (en) | The microstrip antenna transceiver of changeable polarization | |
| CN1516355A (en) | Method and system for overcoming microwave digital transmission receiving blind point due to multipath interference | |
| CN1967613A (en) | Automatic frequency-hopping remote controller | |
| US7782336B2 (en) | System and method for communication among embedded devices using visual images | |
| CN1599486A (en) | Radio communication equipment with device for controlling array element spacing in array antenna | |
| CN117613555A (en) | X-band intelligent circular array antenna technology | |
| US6463090B1 (en) | Communication in high rise buildings | |
| CN1679245A (en) | Method and system for reducing the effect of signal-interference in null areas caused by one or more antennas | |
| GB2235336A (en) | Leaky cable antenna | |
| CN1134121C (en) | Control of transmission power in a radio system | |
| CN1210577C (en) | Control method of wide-band radar detector and its equipment | |
| CN1278130A (en) | Method for controlling cellular telecommunication system | |
| CN1134122C (en) | Emitter systems for transmission of radio signals of given emission frequency according to predefined transmission time protocol | |
| CN113777561B (en) | RCS reflector system capable of changing polarization characteristics | |
| CN1281622A (en) | Seamless lobe handover | |
| JPH0926474A (en) | Radar system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090318 Termination date: 20110108 |