CN103684573B - Portable mobile wireless is with frequency relay system - Google Patents
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Abstract
The invention discloses a kind of portable mobile wireless same frequency relay system, including: casing, described cabinet wall face is provided with multiple guide rail bay for setting up miniature UPS, trunking main frame, audio/video decoder and monitor；Described miniature UPS is connected with trunking main frame, audio/video decoder and monitor, is used for providing 220V alternating current power supply；Described trunking main frame, the signal received is filtered amplification, down coversion, demodulate and decode after forward, flow to audio/video decoder so that signal is sent and/or export TS by repeat transmitted antenna；Described audio/video decoder is connected with described trunking main frame, is converted to AV signal for the TS stream signal sent by trunking main frame, and exports AV signal to monitor；Described monitor is connected with described audio/video decoder, for receiving the AV signal of audio/video decoder output, and this AV signal carries out display output.
Description
Technical field
The present invention relates to wireless image transmission field, particularly relate to a kind of portable mobile wireless with frequency relay system.
Background technology
Wireless emergency communication is closely bound up with the development of society, technology, and its intension is along with the communications industry and technology
Development and be continually changing.Emergency communication can provide communication support timely and effectively for all kinds of emergencies,
It is the important component part of comprehensive emergency guarantee system, the especially life line of rescue and relief work.How to improve wireless
The effective propagation path of emergency communication is the root problem that have to solve, and the relaying of signal is the heaviest
The means wanted.
The mode that existing wireless identical networking system uses alien frequencies to relay mostly, this mode to take two
Frequency range, and two frequency ranges must be spaced certain safe distance, otherwise can produce serious signal disturbing and ask
Topic, when there being multiple equipment to need relaying, it is necessary to take a lot of frequency range, at full stretch at frequency spectrum resource
Today, this is a serious problem.Simultaneously as emergency communication has when and where uncertainty, leads to
The features such as letter demand unpredictability, business emergency, network struction rapidity and process transience, it is desirable to
Trunking have portable light, complete function, application flexibly, the response feature such as quickly, but existing relaying
Equipment volume is huge and needs rack to install, and all cannot meet requirements above so that the application at signal relay station
It is limited by very large.
Summary of the invention
The technical problem that present invention mainly solves is to provide a kind of portable mobile wireless same frequency relay system, and it will be many
Individual integration of equipments is integrated, is easy to carry, same can keep pouring in defeated view data.
For solving above-mentioned technical problem, the technical scheme that the present invention uses is: provide a kind of portable nothing
Line is with frequency relay system, including casing, described cabinet wall face be provided with multiple for set up miniature UPS,
The guide rail bay of trunking main frame, audio/video decoder and monitor；Described miniature UPS sets with relaying
Standby main frame, audio/video decoder and monitor connect, and are used for providing 220V alternating current power supply；Described relaying sets
Standby main frame, the signal received is filtered amplification, down coversion, demodulate and decode after forward,
It flow to audio/video decoder so that signal is sent and/or export TS by repeat transmitted antenna；Described sound
Video Decoder is connected with described trunking main frame, turns for the TS stream signal sent by trunking main frame
It is changed to AV signal, and AV signal is exported to monitor；Described monitor is with described audio/video decoder even
Connect, for receiving the AV signal of audio/video decoder output, and this AV signal is carried out display output.
Wherein, described trunking main frame includes: transmit/receive antenna, is used for receiving and sending radiofrequency signal；Penetrate
Frequency switch, is connected with transmitting/receiving antenna, is used for switching over transmitting/receiving antenna；Analog filtering amplifier, and penetrates
Frequency switch connects, for being filtered the signal received and amplifying；Low-converter, puts with analog filtering
Big device connects, for the signal received is converted to low frequency from high frequency；Oneth SRRC wave filter, with under
Converter connects, for low frequency signal is carried out digital filtering；Synchronizing function module, with a SRRC filter
Ripple device connects, for being adjusted to and local clock by the clock of the signal through a SRRC filter filtering
Identical same frequency；Channel is estimated and balanced unit, is connected with described synchronizing function module, is used for utilizing
Pilot tone calculates the channel response in pilot frequency locations, calculates each by the method for Frequency domain interpolation and temporal interpolation the most again
The channel response of individual subcarrier, thus complete the equilibrium of whole system, makes up multipath fading and Doppler frequency shift
Impact, to equalize the function signal synchronized and optimization process；TDD-OFDM demodulation module, with institute
State channel estimation to connect with balanced unit, for equalizing and optimization process through channel estimation and balanced unit
Signal be demodulated；De-mapping module: be connected with described TDD-OFDM demodulation module, be used for making frequency domain
Signal becomes binary system time-domain digital signal, to carry out data demodulation；De-interleaving block, with described demapping
Module connects, for recovering the structure of the digital signal after De-mapping module demodulates；LDPC solves
Code module, is connected with described de-interleaving block, for encoded information carries out solution LDPC decoding, uses
In the digital signal after de-interleaving block recovers is reduced, so that digital signal to be reduced to original sound
Video information；Descrambling module, is connected with described LDPC decoder module, for decoding mould to through LDPC
Audio/video information after block reduction is decrypted reduction, to be decrypted original audio/video information；At data
Reason module, is connected with described descrambling module, and the original audio/video information for restoring deciphering carries out multiple
System and TS circulation are changed；Scrambling module, is connected with described data processing module, for sending out data processing module
The original audio/video information sent carries out regular randomization, to be encrypted original audio/video information；
LDPC coding module, is connected with scrambling module, the original audio frequency and video letter after encrypting scrambled module
Breath carries out LDPC coding；Interleaving block, is connected with described LDPC coding module, for keeping process
While the content of information after LDPC coding is constant, upset the structure of information, so that transmission process
The mistake that the middle generation that happened suddenly is concentrated is the most decentralized；Mapping block, is connected with interleaving block, uses
In the binary number after interleaving block is upset is carried out constellation mapping, binary system time-domain digital signal is made to become
Become frequency-region signal；TDD-OFDM modulation module, is connected with described mapping block, to information
Manage and be loaded on carrier wave, make information become suitable for the signal in transmission；2nd SRRC wave filter,
It is connected with described TDD-OFDM modulation module, for low frequency signal is carried out digital filtering；Radio-frequency modulator,
It is connected with described 2nd SRRC wave filter, for low frequency signal is modulated into high-frequency signal；Power amplifier,
For high-frequency signal is carried out power amplification；Described radio-frequency (RF) switch, is also connected with power amplifier, is used for controlling
System transmits/receives the switching of antenna.
Wherein, described audio/video decoder be H.264, MPEG2 and/or MPEG4 audio/video decoder.
Wherein, described monitor is collapsible monitor, and described monitor is LED or LCD liquid crystal
Show device.
Wherein, described casing is installed with handle device so that carrying described with frequency relay system.
Wherein, described casing is provided with the universal wheel being easy to move described same frequency relay system.
The invention has the beneficial effects as follows: be different from the situation of prior art, the portable mobile wireless of the present invention is with frequency
Relay system, by miniature UPS, trunking main frame, audio/video decoder, monitor by guide rail bay
It is integrated in casing so that relay system is easy to carry；Owing to relay system is believed by the radio frequency that will receive
Number synchronize and process, hence in so that the signal of the signal launched and reception is in same frequency, it is to avoid
The severe signal interference problem produced in traditional pilot tone relay system.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, describe below
In accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not paying
On the premise of going out creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings；
Fig. 1 is the portable mobile wireless of the present invention front view with frequency relay system one embodiment；
Fig. 2 is the portable mobile wireless of the present invention rearview with frequency relay system one embodiment；
Fig. 3 is the portable mobile wireless of the present invention structural representation with frequency relay system one embodiment；
Fig. 4 is that portable mobile wireless of the present invention is with the block diagram of trunking main frame in frequency relay system one embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, be fully described by, it is clear that described embodiment be only a part of embodiment of the present invention rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
Before embodiment is described, need the term of some necessity is explained.Such as:
If the term such as herein presented use " first ", " second " describes various element, but these yuan
Part should not limited by these terms.These terms are only used for distinguishing an element and another element.Cause
This, " first " element discussed below can also be referred to as " second " element without departing from the present invention's
Teaching.If it should be appreciated that mention that an element " connects " or during " coupled " to another element, its
Can be directly connected or be directly coupled to another element or intermediary element can also be there is.On the contrary,
When mentioning that an element " is directly connected " or " directly coupling " arrives another element, the most there is not centre
Element.
The various terms occurred in this article are used only for describing the purpose of specific embodiment and being not intended as
Limitation of the invention, unless context clearly dictates otherwise, otherwise singulative is intended to also include plural number
Form.
When using term " to include " in this manual and/or time " including ", these terms specify
The existence of described feature, entirety, step, operation, element and/or parts, but be also not excluded for one with
Go up other features, entirety, step, operation, element, parts and/or the existence of its group and/or add.
About embodiment:
Referring to Fig. 1 and Fig. 2, Fig. 1 and Fig. 2 is that portable mobile wireless of the present invention is with frequency relay system one embodiment
Front view and rearview.The portable mobile wireless of the present embodiment includes with frequency relay system: casing 101, described
Casing 101 internal face is provided with multiple for setting up miniature UPS 102(Uninterruptible Power
System/Uninterruptible Power Supply, uninterrupted power source), trunking main frame 103, audio frequency and video
The guide rail bay (not shown) of decoder 104 and monitor 105；Described miniature UPS 102 sets with relaying
Standby main frame 103, audio/video decoder 104 and monitor 105 connect, and are used for providing 220V alternating current power supply；
Described trunking main frame 103, is filtered the signal received amplification, down coversion, demodulates and decode
After forward, flow to audio frequency and video solution so that signal is sent and/or export TS by repeat transmitted antenna
Code device 104；Described audio/video decoder 104 is connected with described trunking main frame 103, for being set by relaying
The TS stream signal that standby main frame 103 sends is converted to AV signal, and exports AV signal to monitor 105；
Described monitor 105 is connected with described audio/video decoder 104, is used for receiving audio/video decoder 104 defeated
The AV signal gone out, and this AV signal is carried out display output.Wherein:
Described casing 101 uses the Pai Liken professional equipment protective housing of customization, and casing 101 uses polyphosphazene polymer
Ethylene (PE), has wearability, high-low temperature resistant, high pressure, the fine quality of shatter-resistant high intensity, divides in superelevation
On the basis of sub-polyethylene raw material, the blended calendering sintering cooling high pressure setting demoulding shapes,
Thus possessed the qualities such as excellent in cushion effect, coefficient of friction is low, self-lubricating property is excellent.
Referring to Fig. 3, described casing 101 both sides are each provided with 2 folding high intensity universal wheels 1011,
When needing, pull-out can make casing 101 move freely, and is folded on casing 101 by universal wheel 1011 when not using；
There is buckle 1012 both sides, casing 101 front, can securely fix the equipment inserted；Casing 101 both sides have
Facilitating the handle 1013 of lift to move, described handle 1013 is fixed on described casing 101 both sides by screw.
Casing 101 interior framework uses the slotting rack and panel construction (not shown) equipped with guide rail, i.e. at casing 101 inwall
Face is provided with the guide tracked bay of multiple " L " type.Described miniature UPS 102, trunking main frame 103, sound
Video Decoder 104 and monitor 105 are all inserted in this guide tracked bay, with guide tracked slotting by this
Frame is fixed on casing 101.Native system integrated level is high, and plot ratio is big, and is easily installed and dismantles, also
Can safeguard easily, simultaneously when device fails, the slotting rack and panel construction equipped with guide rail is easy to event
The precise positioning of barrier and the quick-replaceable of stand-by equipment, the maintenance so making equipment is faster more efficient, joint
Save valuable time, it is ensured that the high rate of attendance of equipment.
Due to by trunking main frame 103, audio/video decoder 104 and monitor 105 etc. equal bay of equipment
In casing 101, this compact slotting rack and panel construction is not only greatly saved equipment volume, and plus waterproof,
The protection Design of the multiple advanced persons such as dust-proof, anticorrosion, thermostatic control, shielding isolation, more can be effectively improved
The reliability of equipment so that wireless be adapted to various adverse circumstances can guarantee that with frequency relay system and just continue
Often work, ensures for wireless emergency communication and provides strong support.Wireless same frequency relay system inserts rack and panel construction
Each groove position compatibility plurality of devices, including unidirectional and two-way wireless image transmission trunking (1U or 2U), SD
With the audio/video decoder 104(H.264 of high definition MPEG2 MPEG4), the KVM equipment etc. of various model,
Thus according to different business demands, different function devices or the combination between them can be installed,
Access while realizing miscellaneous service, meet the diversity requirement of client.It addition, good compatibility can
Think that client provides more and selects and more preferable solution.This system is by business personnel, service engineer
Or Test Engineer's onboard, when occurring emergency situations to need to relay relay, can at any time, promptly
Move to love scene, as the reliable relaying relay point of on-the-spot emergency communication, for on-the-spot audio, video data
Upload and high stability, wireless channel with a large bandwidth and at a high rate are provided.
Referring to Fig. 3, Fig. 3 is that portable mobile wireless of the present invention is with trunking master in frequency relay system one embodiment
The block diagram of machine 103.Described trunking main frame 103 includes:
Transmit/receive antenna 1031, be used for receiving and sending radiofrequency signal；
Radio-frequency (RF) switch 1032, is connected with transmitting/receiving antenna 1031, for switching over transmitting/receiving antenna 1031；
Analog filtering amplifier 1033, is connected with radio-frequency (RF) switch 1032, for filtering the signal received
Ripple and amplification；
Low-converter 1034, is connected with analog filtering amplifier 1033, and the signal being used for receiving is from high frequency
It is converted to low frequency；Described high frequency refers to zero-frequency at 300MHz～800MHz, low frequency；
Oneth SRRC(Square Root Raised Cosine, square root raised cosine) wave filter 1035, with
Low-converter 1034 connects, for low frequency signal is carried out digital filtering；
Synchronizing function module 1036, is connected with a SRRC wave filter 1035, and being used for will be through a SRRC
The clock of the signal of filter filtering is adjusted to the same frequency identical with local clock；
Channel is estimated and balanced unit 1037, is connected with described synchronizing function module 1036, is used for utilizing pilot tone
Calculate the channel response in pilot frequency locations, calculate each height by the method for Frequency domain interpolation and temporal interpolation the most again
The channel response of carrier wave, thus complete the equilibrium of whole system, make up the impact of multipath fading and Doppler frequency shift,
The function signal synchronized is equalized and optimization process；
TDD-OFDM(Time Division Duplexing-Orthogonal Frequency Division
Multiplexing, the OFDM of time division duplex) demodulation module 1038, estimate with described channel and equal
Weighing apparatus unit 1037 connect, for through channel estimate and balanced unit 1037 equalizes and optimization process letter
Number it is demodulated；
De-mapping module 1039: be connected with described TDD-OFDM demodulation module 1038, is used for making frequency domain believe
Number become binary system time-domain digital signal, to carry out data demodulation；
De-interleaving block 1040, is connected with described De-mapping module 1039, for through De-mapping module
The structure of the digital signal after 1039 demodulation is recovered；
LDPC(Low-density Parity-check, low-density checksum) decoder module 1041, with institute
State de-interleaving block 1040 to connect, for encoded information carries out solution LDPC decoding, for process
Digital signal after de-interleaving block 1040 recovers reduces, so that digital signal to be reduced to original audio frequency and video
Information；
Descrambling module 1042, is connected with described LDPC decoder module 1041, for decoding through LDPC
Audio/video information after module 1041 reduction is decrypted reduction, to be decrypted original audio/video information；
Data processing module 1043, is connected with described descrambling module 1042, former for restore deciphering
Beginning audio/video information carries out duplication and TS circulation is changed；
Scrambling module 1044, is connected with described data processing module 1043, for data processing module 1043
The original audio/video information sent carries out regular randomization, to add original audio/video information
Close；
LDPC coding module 1045, is connected with scrambling module 1044, for scrambled module 1044
Original audio/video information after encryption carries out LDPC coding；
Interleaving block 1046, is connected with described LDPC coding module 1045, for keeping through LDPC
While the content of the information after coding is constant, upset the structure of information, so that institute during transmission
It is the most decentralized that burst produces the mistake concentrated；
Mapping block 1047, is connected with interleaving block 1046, for after interleaving block 1046 is upset
Binary number carry out constellation mapping, make binary system time-domain digital signal become frequency-region signal；
TDD-OFDM modulation module 1048, is connected with described mapping block 1047, for carrying out information
Process and be loaded on carrier wave, make information become suitable for the signal in transmission；
2nd SRRC wave filter 1049, is connected with described TDD-OFDM modulation module 1048, for right
Low frequency signal carries out digital filtering；
Radio-frequency modulator 1050, is connected with described 2nd SRRC wave filter 1049, for being adjusted by low frequency signal
Make high-frequency signal；
Power amplifier 1051, is connected with described radio-frequency modulator 1050, for high-frequency signal is carried out power
Amplify；
Described radio-frequency (RF) switch 1032, is also connected with power amplifier 1051, transmits/receives antenna 1031 for control
Switching.
When this trunking main frame 103 works, the reception link in main frame is filtered putting after receiving signal
Greatly, down coversion, demodulation, decoded code stream enter recording controller, recording controller carry out data and turn
Send out, forward the data to transmitting chain be modulated, amplify after launch.Recording controller can also be by
Data are forwarded in TS stream transformer, TS stream transformer export TS after changing and flow signal, for this rock noise
Video Decoder 104 decoding is checked.Power amplifier uses TDD full-duplex mode, by controlling radio-frequency (RF) switch 1032,
The reception of switching power amplifier and transmitting so that transmitting-receiving does not interfere with each other under identical frequency band, be effectively utilized frequency spectrum money
Source, it is achieved that transmit-receive cofrequency, the function relayed with frequency.
Described audio/video decoder 104 uses built-in industrial decoder, supports MPEG2/H.264/MPEG4
Decoding, can match SD or high definition decoder.Described audio/video decoder 104 and described trunking main frame
103 connect, and for receiving the TS stream that trunking main frame 103 sends, and directly transfer this TS stream to AV
Signal, exports this AV signal to monitor 105.
In the present embodiment, described monitor 105 uses the collapsible monitor of technical grade 105, audio/video decoding
The audio-video signal of device 104 output accesses and can directly display image and send sound.Described monitor 105
It is inserted in casing 101 by " L " type guide rail bay.Described monitor 105 can be LCD liquid crystal prison
Visual organ or LED LCD monitor.
Described miniature UPS 102 uses technical grade Large Copacity miniaturization exchange UPS, and alternating current 220V is powered, and supplies
While electricity, internal battery is carried out floating charge, when, after AC dump, UPS internal battery is defeated after inversion
Going out alternating current 220V is that other equipment are powered.Fully charged UPS unit can ensure that equipment normally works 4 hours
Above.Described miniature UPS 102 is used for as trunking main frame 103, audio/video decoder 104, monitor
105 provide power supply.
Embodiment of the present invention, leads to miniature UPS, trunking main frame, audio/video decoder, monitor
Cross guide rail bay to be integrated in casing so that relay system is easy to carry；Owing to relay system will be by receiving
To radiofrequency signal synchronize and process, hence in so that the signal of signal and the reception launched is in same frequency
Rate, it is to avoid the severe signal interference problem produced in traditional pilot tone relay system.
These are only embodiments of the present invention, not thereby limit the scope of the claims of the present invention, every utilization
Equivalent structure or equivalence flow process that description of the invention and accompanying drawing content are made convert, or directly or indirectly use
In the technical field that other are relevant, the most in like manner it is included in the scope of patent protection of the present invention.
Claims (5)
1. a portable mobile wireless is with frequency relay system, it is characterised in that including:
Casing, described cabinet wall face is provided with multiple guide rail bay for setting up miniature UPS, trunking main frame, audio/video decoder and monitor；
Described miniature UPS is connected with trunking main frame, audio/video decoder and monitor, is used for providing 220V alternating current power supply；
Described trunking main frame, the signal received is filtered amplification, down coversion, demodulate and decode after forward, flow to audio/video decoder so that signal is sent and/or export TS by repeat transmitted antenna；
Described audio/video decoder is connected with described trunking main frame, is converted to AV signal for the TS stream signal sent by trunking main frame, and exports AV signal to monitor；
Described monitor is connected with described audio/video decoder, for receiving the AV signal of audio/video decoder output, and this AV signal carries out display output；
Described trunking main frame includes:
Transmit/receive antenna, be used for receiving and sending radiofrequency signal；
Radio-frequency (RF) switch, is connected with transmitting/receiving antenna, for switching over transmitting/receiving antenna；
Analog filtering amplifier, is connected with radio-frequency (RF) switch, for being filtered the signal received and amplifying；
Low-converter, is connected with analog filtering amplifier, for the signal received is converted to low frequency from high frequency；
Oneth SRRC wave filter, is connected with low-converter, for low frequency signal is carried out digital filtering；
Synchronizing function module, is connected with a SRRC wave filter, and the clock of the signal for being filtered by device after filtering is adjusted to the same frequency identical with local clock；
Channel is estimated and balanced unit, it is connected with described synchronizing function module, for utilizing pilot tone to calculate the channel response in pilot frequency locations, the channel response of each subcarrier is calculated the most again by the method for Frequency domain interpolation and temporal interpolation, thus complete the equilibrium of whole system, make up the impact of multipath fading and Doppler frequency shift, the function signal synchronized to be equalized and optimization process；
TDD-OFDM demodulation module, estimates with described channel and balanced unit is connected, for being demodulated through the signal that channel is estimated and balanced unit equalizes and optimization processes；
De-mapping module: be connected with described TDD-OFDM demodulation module, is used for making frequency-region signal become binary system time-domain digital signal, to carry out data demodulation；
De-interleaving block, is connected with described De-mapping module, for recovering the structure of the digital signal after De-mapping module demodulates；
LDPC decoder module, is connected with described de-interleaving block, for encoded information carries out solution LDPC decoding, for reducing, the digital signal after de-interleaving block recovers so that digital signal to be reduced to original audio/video information；
Descrambling module, is connected with described LDPC decoder module, for the audio/video information after LDPC decoder module reduces is decrypted reduction, to be decrypted original audio/video information；
Data processing module, is connected with described descrambling module, and the original audio/video information for restoring deciphering replicates and TS circulation is changed；
Scrambling module, is connected with described data processing module, carries out regular randomization, to be encrypted original audio/video information for the original audio/video information sending data processing module；
LDPC coding module, is connected with scrambling module, and the original audio/video information after encrypting scrambled module carries out LDPC coding；
Interleaving block, is connected with described LDPC coding module, for, while the content of the information kept after LDPC encodes is constant, upsetting the structure of information, so that the mistake that the generation that happened suddenly during transmission is concentrated is the most decentralized；
Mapping block, is connected with interleaving block, for the binary number after interleaving block is upset is carried out constellation mapping, makes binary system time-domain digital signal become frequency-region signal；
TDD-OFDM modulation module, is connected with described mapping block, for processing information and being loaded into carrier wave, makes information become suitable for the signal in transmission；
2nd SRRC wave filter, is connected with described TDD-OFDM modulation module, for low frequency signal is carried out digital filtering；
Radio-frequency modulator, is connected with described 2nd SRRC wave filter, for low frequency signal is modulated into high-frequency signal；
Power amplifier, for carrying out power amplification to high-frequency signal；
Described radio-frequency (RF) switch, is also connected with power amplifier, for controlling to transmit/receive the switching of antenna.
2. portable mobile wireless as claimed in claim 1 is with frequency relay system, it is characterised in that: described audio/video decoder be H.264, MPEG2 and/or MPEG4 audio/video decoder.
3. portable mobile wireless as claimed in claim 2 is with frequency relay system, it is characterised in that: described monitor is collapsible monitor, and described monitor is LED or LCD liquid crystal display.
4. portable mobile wireless as claimed in claim 2 is with frequency relay system, it is characterised in that: it is installed with handle device on described casing so that carrying described with frequency relay system.
5. portable mobile wireless as claimed in claim 3 is with frequency relay system, it is characterised in that: it is provided with on described casing and is easy to the mobile described universal wheel with frequency relay system.
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| CN201310693888.7A CN103684573B (en) | 2013-12-17 | 2013-12-17 | Portable mobile wireless is with frequency relay system |
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| CN201310693888.7A CN103684573B (en) | 2013-12-17 | 2013-12-17 | Portable mobile wireless is with frequency relay system |
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| CN103684573A CN103684573A (en) | 2014-03-26 |
| CN103684573B true CN103684573B (en) | 2016-08-17 |
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| CN202551180U (en) * | 2012-03-09 | 2012-11-21 | 北京信诺飞图科技有限公司 | Portable video relay equipment |
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| JP3930521B2 (en) * | 2005-08-04 | 2007-06-13 | 日本無線株式会社 | Digital television broadcast signal relay device |
| US20120081069A1 (en) * | 2010-09-30 | 2012-04-05 | I O Interconnect, Ltd. | Communication apparatus and signal processing method |
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|---|---|---|---|---|
| CN1781260A (en) * | 2003-04-08 | 2006-05-31 | 法国电信公司 | Terminal device for a bi-directional radio relay link |
| CN202340266U (en) * | 2011-11-03 | 2012-07-18 | 成都时代星光科技有限公司 | Wireless repeating single frequency point high-definition image multi-path synchronous lossless receiver |
| CN202340285U (en) * | 2011-11-03 | 2012-07-18 | 成都时代星光科技有限公司 | Wireless relay single-frequency point high-definition image multi-path synchronous lossless transmitting system |
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