CN101198039A - Broadcasting television signal transmitting method, system and base station - Google Patents
Broadcasting television signal transmitting method, system and base station Download PDFInfo
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- CN101198039A CN101198039A CNA2008100018033A CN200810001803A CN101198039A CN 101198039 A CN101198039 A CN 101198039A CN A2008100018033 A CNA2008100018033 A CN A2008100018033A CN 200810001803 A CN200810001803 A CN 200810001803A CN 101198039 A CN101198039 A CN 101198039A
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Abstract
The invention discloses a transmitting method for broadcast television signals, a system and a base station, which are used for solving the problems of large interference of intersecting regions, high cost and complex debugging when the prior art is used for realizing same frequency transmission of the broadcast television signals. The transmitting method for the broadcast television signals provided by the invention comprises the following steps: the broadcast television signals are modulated and high frequency modulated carriers are generated; the high frequency modulated carriers are converted into light signals which are transmitted to various base stations; the light signals are converted into high frequency modulated carriers by various base stations, and the high frequency modulated carriers are transmitted to user terminals. The invention is used for realizing same frequency multiple base station transmission of the broadcast televisions signals and has the advantages of lowering of same frequency interference of intersecting regions, simpler debugging and reduction of equipment cost.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of launching technique, system and a kind of base station of broadcast television signal.
Background technology
In order to realize that the transmission of broadcast television signal large tracts of land covers, the normal Optical Fiber Transmission broadcast television signal that adopts, in the overlay area, set up many digital transmitters to carry out synchronized transmissions, in order to make receiving terminal in the overlay area, receive broadcast television signal reliably, must make adjacent transmitter send consistent as far as possible spectrum signal.With the digital television signal is example, the normal same frequency synchronous transmission that adopts following technology to realize digital television signal in the prior art:
As shown in Figure 1, after broadcast television signal (video/audio signal) is handled by digital coding, send into optical sender, be converted to the light signal that contains data code flow, to transmitting base station A and B, through optical receiver light signal is converted to data-signal through Optical Fiber Transmission, is sent to modulator and produces the high frequency modulated carrier at transmitting base station, after preposition amplification and power amplifier emission, go out by antenna transmission.
But, in transmitting base station A and B, when digital signal is modulated into high frequency carrier, experienced a nonlinear process, therefore, two base stations of A, B are not in full accord through the high frequency carrier frequency spectrum that modulation produces, and when the modulated carrier signal in A, the B base station drops on a receiving terminal simultaneously, will form homogenous frequency signal and disturb.Two transmitting base stations of A, B are in order to ensure the carrier frequency unanimity of sending, adopted global positioning system (GPS, global positioning system) high precision reference clock signal is carried out synchronously, the GPS reference clock signal locks local oscillation signal by phase-locked loop, the centre carrier frequency that transmitter is sent is constantly revised and is reached stable, but, above process can not guarantee that the carrier wave instantaneous frequency of A, two transmitting base stations of B is identical, and small frequency error must cause quite serious co-channel interference.
In addition, because prior art need be modulated to broadcast television signal the high frequency modulated carrier respectively at each inside of base station, and need carry out synchronous debugging by the GPS standard time clock, make that the system equipment cost is higher, the debugging complexity is also higher.
In sum, the existing techniques in realizing broadcast television signal is during with many base station frequently, and intersecting area disturbs bigger, and cost height, debugging are complicated.
Summary of the invention
The embodiment of the invention provides a kind of launching technique, system and a kind of base station of broadcast television signal, and the intersecting area that exists during in order to solution existing techniques in realizing broadcast television signal many base station of frequency together disturbs greatly, cost is high, debug complicated problems.
The launching technique of the broadcast television signal that the embodiment of the invention provides comprises:
Broadcast television signal is carried out modulation treatment, generate the high frequency modulated carrier;
Described high frequency modulated carrier is converted to light signal gives each base station through Optical Fiber Transmission;
Each described base station is converted to the high frequency modulated carrier with described light signal and is transmitted to user terminal.
The emission system of the broadcast television signal that the embodiment of the invention provides comprises: modulating unit, transmission unit and base station;
Described modulating unit is used for broadcast television signal is carried out modulation treatment, generates the high frequency modulated carrier;
Described transmission unit is used for that described high frequency modulated carrier is converted to optical signal transmission and gives each described base station;
Described base station is used for that described light signal is converted to the high frequency modulated carrier and is transmitted to user terminal.
A kind of base station that the embodiment of the invention provides comprises:
Receiving element is used to receive the high frequency modulated carrier signal of broadcast television signal;
The time delay adjustment unit is used for according to the launch point of described high frequency modulated carrier and the distance between self, and described high frequency modulated carrier signal is carried out the time delay adjustment.
The embodiment of the invention by broadcast television signal is carried out modulation treatment, generates the high frequency modulated carrier; Described high frequency modulated carrier is converted to optical signal transmission gives each base station, and give user terminal by described each base station, because the high frequency carrier spectrum component that each base station receives is identical, particularly the transient behavior relative difference on frequency is zero, thereby avoided the difference that each base station high frequency carrier frequency spectrum exists in the prior art transmission, when making the high frequency modulated carrier of each base station drop on a user terminal simultaneously, the homogenous frequency signal of generation disturbs reduces to minimum; And because each base station receives the modulated carrier of same frequency spectrum, therefore, it is very simple that system debug becomes, and equipment cost obviously reduces.
Description of drawings
Fig. 1 realizes the system schematic of digital broadcasting-television signal with the frequency synchronous transmission in the prior art;
The emission system structural representation of the digital television signal that Fig. 2 provides for the embodiment of the invention;
The launching technique schematic flow sheet of the digital television signal that Fig. 3 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention, a kind of same shooting method and system of taking place frequently of broadcast television signal is provided, by broadcast television signal being modulated into the high frequency modulated carrier, be transferred to the method for each base station through opto-electronic conversion, the high frequency modulated carrier signal relative error of the frequency that each base station of system is sent is zero, fibre delay line by each base station can be controlled the base station time delay accurately, thereby reduced the co-channel interference between the transmitting base station, and, this method can reduce the system equipment cost, makes debugging simpler.
It is that example describes that the embodiment of the invention adopts the Optical Fiber Transmission digital broadcasting-television signal.
Below in conjunction with accompanying drawing, the embodiment of the invention is specifically described.
Referring to Fig. 2, the same system of penetrating that takes place frequently of the broadcast television signal that the embodiment of the invention provides comprises:
Modulating unit 22 is used for digital television signal is carried out modulation treatment, generates the high frequency modulated carrier.
The embodiment of the invention is an example with two base stations, in like manner can also comprise more base stations certainly.
Preferably, transmission unit 24 comprises:
The fiber lengths of first transmission unit 241 and second transmission unit 242 is provided with according to the distance between optical sender 23 and base station 25 and the base station 26, can be identical, also can be different, and be different generally speaking.Because the fiber lengths of the optical receiver of optical sender 23 each base stations of arrival is unequal, can make that the emission time delay of transmitter of each base station is also unequal, therefore in order to guarantee that the emission time delay between each base station equates, need carry out the time delay adjustment to the light signal that receives, it is synchronous to make that each base station reaches launch time.
Preferably, base station 25 comprises:
Receiving element 251 is used to receive the light signal that comprises described high frequency modulated carrier.
Time delay adjustment unit 252 is used for according to optical sender 23 and the fiber lengths between self, by changing the length adjustment time delay (transmission speed of light in optical fiber is about 200 meters/microsecond) of fibre delay line, realizes the synchronous of time delays launched in described base station 25.
Preferably, transmitter unit 254 comprises:
Pre-amplifier unit 2541 is used for the high frequency modulated carrier is carried out sending into power amplifier unit 2542 after the preposition processing and amplifying.
In like manner, base station 26 comprises:
Receiving element 261 is used to receive the light signal that comprises described high frequency modulated carrier.
Time delay adjustment unit 262 is used for according to optical sender 23 and the fiber lengths between self, by changing the length adjustment time delay of fibre delay line, realizes the synchronous of time delays launched in described base station 26.
Preferably, transmitter unit 264 comprises:
For example, video/audio signal is converted to digital signal through digital coding unit 21, is sent to modulating unit 22 and handles, produce high-frequency carrier signal f0 (530MHz), be sent to optical sender 23, be converted to the light signal that contains high frequency modulated carrier signal, arrive transmitting base station 25 and 26 through Optical Fiber Transmission.In the base station 25 and 26 inside, base station, carry out the time delay adjustment through fibre delay line, be sent to optical receiver, respective base station 25 and base station 26 are converted to high frequency modulated carrier fa (530MHz) and fb (530MHz) respectively, after preposition amplification and power amplification processing, be transmitted into user terminal 27 again.Wherein, 25 distance is 23500 meters to the c point at optical sender 23 places to the base station, and recording signal lag is 117.5 microseconds; 26 distance is 32300 meters to the c point to the base station, and recording signal lag is 161.5 microseconds.In order to realize the synchronized transmissions of base station 25 and base station 26, change the length of the fibre delay line of transmitting base station 25, making the delay line time delay is 44 microseconds, the fibre delay line that changes transmitting base station 26 is pass-through state (0 microsecond of delaying time), at this moment, the emission time delay of the high frequency modulated carrier of base station 25 and base station 26 is in full accord, and the relative error of the frequency of two base stations is zero, and the co-channel interference in the signal intersecting area is kept to minimum.
Introduce the device that the embodiment of the invention provides below.
A kind of base station that the embodiment of the invention provides comprises:
Receiving element is used to receive the high frequency modulated carrier signal of broadcast television signal;
The time delay adjustment unit is used for according to the launch point of described high frequency modulated carrier and the distance between self, and described high frequency modulated carrier signal is carried out the time delay adjustment.
Introduce the method that the embodiment of the invention provides below.
Referring to Fig. 3, the same shooting method that takes place frequently of the broadcast television signal that the embodiment of the invention provides comprises:
S301, broadcast television signal is carried out digital coding handle, obtain digital television signal.
S302, digital television signal is carried out modulation treatment, obtain the high frequency modulated carrier.
S303, the high frequency modulated carrier is converted to light signal, and gives each base station by Optical Fiber Transmission.
S304, each base station are by adjusting the fibre delay line time delay, achieve a butt joint the time delay adjustment of the light signal of receiving.
S305, each base station are converted to the high frequency modulated carrier with light signal, and this moment, the high frequency modulated carrier time delay of each base station was in full accord.
S306, each base station are transmitted to user terminal through antenna after the high frequency modulated carrier is carried out preposition processing and amplifying and power amplification processing.
The technical scheme that adopts the situation of the signal of other transmission meanss (as cable etc.) transmission other types also can adopt the embodiment of the invention to provide is provided.For example: when adopting coaxial cable transmission broadcast singal, only need remove optical transceiver, change fibre delay line into the carrier wave delay line, can realize the same frequency synchronized transmissions of broadcast singal.
In sum, high frequency modulated carrier signal after the embodiment of the invention will be modulated is sent into optical sender, through the optical receiver of Optical Fiber Transmission in each base station, change out high frequency modulated carrier signal at the optical receiver of each base station, in this transfer process, any variation does not take place in the frequency of high frequency modulated carrier, the relative error of the frequency of the high frequency modulated carrier of each base station is zero, its frequency spectrum is identical, simultaneously, emission time delay in each base station can accurately be controlled by delay line, avoided the difference that each base station high frequency carrier frequency spectrum exists in the prior art transmission, when thereby the high frequency modulated carrier that makes each base station dropped on a user terminal simultaneously, the homogenous frequency signal of generation disturbs reduced to minimum; And because each base station receives the modulated carrier of same frequency spectrum, therefore, it is very simple that system debug becomes, and equipment cost obviously reduces.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the launching technique of a broadcast television signal is characterized in that, this method comprises:
Broadcast television signal is carried out modulation treatment, generate the high frequency modulated carrier;
Described high frequency modulated carrier is converted to optical signal transmission gives each base station;
Each described base station is converted to the high frequency modulated carrier with described light signal and is transmitted to user terminal.
2. method according to claim 1 is characterized in that, this method also comprises:
Convert described high frequency modulated carrier to contain described high frequency modulated carrier signal light signal by optical sender, and give described each base station by Optical Fiber Transmission;
Described each base station converts described light signal to described high frequency modulated carrier by optical receiver.
3. method according to claim 2 is characterized in that, this method also comprises:
After described each base station receives described light signal,, the described light signal that receives is carried out the time delay adjustment according to the fiber lengths between described optical signal transmitting point and the acceptance point of self.
4. method according to claim 3 is characterized in that, described each base station is carried out the time delay adjustment by fibre delay line to the described light signal that receives.
5. method according to claim 1 is characterized in that, this method also comprises:
Described each base station is transmitted to user terminal by antenna after described high frequency modulated carrier is passed through preposition processing and amplifying and power amplification processing.
6. the emission system of a broadcast television signal is characterized in that, this system comprises: modulating unit, transmission unit and base station;
Described modulating unit is used for broadcast television signal is carried out modulation treatment, generates the high frequency modulated carrier;
Described transmission unit is used for that described high frequency modulated carrier is converted to optical signal transmission and gives each described base station;
Described base station is used for that described light signal is converted to the high frequency modulated carrier and is transmitted to user terminal.
7. system according to claim 6 is characterized in that, this system also comprises:
Optical sender is used for converting described high frequency modulated carrier to contain described high frequency modulated carrier signal light signal;
Described transmission unit is used for giving each described base station by optical fiber with described optical signal transmission;
Described base station comprises:
Optical receiver is used for converting described light signal to described high frequency modulated carrier;
Transmitter unit is used for described high frequency modulated carrier is transmitted to user terminal.
8. system according to claim 7 is characterized in that, described base station also comprises:
Receiving element is used to receive described light signal;
The time delay adjustment unit is used for according to described optical sender and the fiber lengths between self described light signal being carried out the time delay adjustment.
9. system according to claim 8 is characterized in that, described time delay adjustment unit is realized the time delay adjustment to described light signal by adjusting the fibre delay line time delay.
10. a base station is characterized in that, this base station comprises:
Receiving element is used to receive the high frequency modulated carrier signal of broadcast television signal;
The time delay adjustment unit is used for according to the launch point of described high frequency modulated carrier and the distance between self, and described high frequency modulated carrier signal is carried out the time delay adjustment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100018033A CN101198039A (en) | 2008-01-03 | 2008-01-03 | Broadcasting television signal transmitting method, system and base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100018033A CN101198039A (en) | 2008-01-03 | 2008-01-03 | Broadcasting television signal transmitting method, system and base station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101198039A true CN101198039A (en) | 2008-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100018033A Pending CN101198039A (en) | 2008-01-03 | 2008-01-03 | Broadcasting television signal transmitting method, system and base station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101198039A (en) |
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2008
- 2008-01-03 CN CNA2008100018033A patent/CN101198039A/en active Pending
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Open date: 20080611 |