CN107437950A - A kind of tunnel fm broadcast signal numeral covering scheme and implementation method - Google Patents
A kind of tunnel fm broadcast signal numeral covering scheme and implementation method Download PDFInfo
- Publication number
- CN107437950A CN107437950A CN201710682877.7A CN201710682877A CN107437950A CN 107437950 A CN107437950 A CN 107437950A CN 201710682877 A CN201710682877 A CN 201710682877A CN 107437950 A CN107437950 A CN 107437950A
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- Prior art keywords
- digital
- signal
- optical
- remote termination
- optical fiber
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/69—Optical systems
Abstract
The present invention relates to frequency modulation broadcasting field, particularly a kind of tunnel fm broadcast signal numeral covering scheme and implementation method.Frequency modulation broadcasting digital optical fiber direct station is by near-end machine, two kinds of equipment compositions of remote termination, the operation principle of system is that near-end machine receives fm broadcast signal by antenna, filtered device, low-noise amplifier, analog-to-digital conversion (ADC), Digital Down Convert (DDC), baseband signal carries out electro-optic conversion after using CPRI agreement framings, digital optical signal is transferred to REMOTE MACHINE by optical fiber, remote termination is through opto-electronic conversion, CPRI agreement solution frames, Digital Up Convert (DUC), digital-to-analogue conversion (DAC) enters power amplifier afterwards, high-power frequency broadcast singal is sent to overlay area by antenna or leakage cable.Using the transmission means of netting twine, concrete implementation method is that digital transmission protocol CPRI is substituted with Ethernet protocol, optical module is substituted with network interface, optical fiber netting twine is substituted and realized.
Description
Technical field
The present invention relates to frequency modulation broadcasting field, particularly a kind of tunnel based on digital fiber or digital netting twine repeater
Fm broadcast signal covers scheme, includes the covering of the fm broadcast signal of city tunnel, freeway tunnel etc..
Background technology
Tunnel construction increasingly becomes the important selection mode of city road network transformation.Tunnel not only substantially improves city friendship
Logical situation, and beautified urban landscape.But people have found gradually while enjoying current smooth, vehicle-mounted broadcasting signal
But off and on, often " entered tunnel and do not had signal, gone out tunnel and listened advertisement ", important information can only be listened " a few isolated words and phrases ".
Vehicle driver and crew turn into one of the main audience colony in broadcasting station, many driver and crew's including taxi driver
There is certain dependence in broadcasting station.Not only there is obvious effect in broadcasting station in terms of Public-opinion directing, propagation positive energy,
And accident emergency disposal and rescue, relieve traffic congestion, love transmission, that searching person and object etc. can also play uniqueness is excellent
Gesture, the typical case of this respect are too numerous to enumerate.If continued according to the broadcast singal covering situation in current tunnel, tunnel is built
If more, broadcast " blind area " is bigger, and the above-mentioned advantage in broadcasting station also will progressively be lost, and the whole society will be that city tunnel is present
" potential risk " pay heavy cost.
The content of the invention
The present invention a kind of is adjusted to solve the above problems, proposing based on digital fiber or the tunnel of digital netting twine repeater
Frequency broadcast singal covers scheme.
Frequency modulation broadcasting digital optical fiber direct station employs the mode of digital fiber to carry out the transmission of fm broadcast signal.Adjust
Frequency broadcast figure optical fiber repeater is made up of two kinds of near-end machine, remote termination equipment, and system link operation principle is that near-end machine passes through
Antenna receives fm broadcast signal, filtered device, low-noise amplifier, analog-to-digital conversion (ADC), Digital Down Convert (DDC), base band
Signal carries out electro-optic conversion after using CPRI agreement framings, and digital optical signal is transferred to REMOTE MACHINE, remote termination warp by optical fiber
Opto-electronic conversion, CPRI agreement solutions frame, Digital Up Convert (DUC), digital-to-analogue conversion (DAC) enter power amplifier afterwards, last big work(
Rate fm broadcast signal is sent to overlay area by antenna or leakage cable.
Brief description of the drawings
Fig. 1 is digital optical fiber direct station frequency modulation broadcasting covering system schematic diagram.
The FPGA portion that Fig. 2 is the present invention realizes block diagram.
Fig. 3 is the Matlab design parameters of formed filter of the present invention.
Fig. 4 is the schematic diagram that the present invention increases coverage distance by way of remote termination cascade.
Fig. 5 is the transmission means schematic diagram that Ethernet replaces digital transmission protocol CPRI.
Fig. 6 is the transmission means schematic diagram that network interface replaces optical module.
Fig. 7 is the transmission means schematic diagram that netting twine replaces optical fiber.
Embodiment
The invention will be described further with implementation below in conjunction with the accompanying drawings：
Fig. 1 is frequency modulation broadcasting digital optical fiber direct station covering system schematic diagram.The system includes reception antenna, coaxial electrical
Cable, near-end machine, optical module, optical fiber, remote termination, transmission antenna.
The FPGA portion that Fig. 2 is the present invention realizes block diagram.Near-end machine FPGA portion is mainly that the function of realizing is：Under numeral
Frequency conversion, extraction, digital filtering, CPRI framings, SERDES parallel-serial conversions.Remote termination FPGA portion is mainly that the function of realizing is
SERDES serioparallel exchanges, CPRI solutions frame, interpolation and Digital Up Convert.
The frequency modulation broadcasting use range in China is 87.5-108MHz, center frequency point 97.75MHz, bandwidth 20.5MHz.Receive
Antenna is placed on the place that tunnel external enwergy effectively receives fm broadcast signal, and reception antenna is inputted by coaxial cable and near-end machine
Port is connected.The signal of reception filters out the frequency modulation broadcasting out-of-band garbage signal (frequency of receiving filter by receiving filter
Section is 87.5MHz-108MHz), give AD after being amplified by low-noise amplifier to the faint fm broadcast signal of reception
AD samplings are carried out, AD sample frequency is 122.88MHz, and intermediate frequency is converted into for 97.75MHz analog signals by AD samplings
The data signal that intermediate frequency is 97.75MH, sample rate is 122.88MHz, it is then passed to FPGA and does Digital Signal Processing.
Near-end machine FPGA Digital Down Converter Module is that 97.75MHz data signals are mixed into zero intermediate frequency, sample rate intermediate frequency
For 122.88MHz digital baseband I/Q signal.In order to save the transmission bandwidth of optical fiber, abstraction module is extracted speed by 4 times
Be reduced to 30.72MHz, then effective signal bandwidth be limited in 20.5MHz by digital filter, digital filtering module into
The Matlab design parameters of mode filter are as shown in Figure 3.CPRI framing modules press the base band I/Q signal that speed is 30.72MHz
Framing is carried out according to the CPRI specifications that line rate is 614.1MHz, so that distal end function properly separates out base band I/Q signal.FPGA's
SERDES parallel-serial conversions are that to be converted into speed be the serial of 614.1MHz for parallel signal that 30.72MHz bit wides are 32 speed
Electric signal, optical module are converted into high-speed electrical signals to be transferred to remote termination by optical fiber after optical signal.
Remote termination optical module is converted into optical signal to give FPGA after electric signal, and SERDES serioparallel exchanges are speed
614.1MHz serial signal serioparallel exchange is then passed to CPRI solutions into the parallel signal that speed is that 30.72MHz bit wides are 32
Frame module isolates base band I/Q signal.The Interpolation of signals 4 that speed is 30.72MHz is converted into speed by interpolation module again
122.88MHz, then by digital upper side frequency module the I/Q signal frequency conversion of zero intermediate frequency into intermediate frequency be 97.75MHz data signals
Give DA.DA is converted into the data signal that intermediate frequency is 97.75MHz, sample rate is 122.88MHz the mould that intermediate frequency is 97.75MHz
Intend signal, last power amplifier carries out the covering in tunnel being sent after fm broadcast signal power amplification by antenna.
Foregoing description is the transmission means for using optical fiber, and this programme can also use the transmission means of netting twine, specifically
Implementation method is that digital transmission protocol CPRI is substituted with Ethernet protocol, optical module is substituted with network interface, optical fiber netting twine substitutes in fact
It is existing.Specifically as shown in Fig. 5, Fig. 6, Fig. 7.
In the case of long in tunnel, coverage distance can be increased by way of remote termination cascade.Fig. 4, Fig. 7 are this hairs
The bright schematic diagram for increasing coverage distance by way of remote termination cascade.Remote termination has two optical ports (network interface), is defined as optical port
(network interface) A and optical port (network interface) B.The A optical ports (network interface) of remote termination 1 are connected with near-end machine optical port (network interface), receive near-end machine
Optical signal (ethernet signal), signal are forwarded to remote termination 2 by optical port (network interface) B again, by that analogy cascading multiple stages remote termination.
All frequency modulation broadcastings based on digital fiber or digital netting twine repeater formed using equivalent substitution or equivalent transformation
Tunnel signal covers scheme, all falls within the protection domain of application claims.
Claims (3)
1. a kind of tunnel fm broadcast signal numeral covering scheme and implementation method is characterized in that：Using digital fiber or number
The mode of word netting twine repeater carries out the covering of tunnel fm broadcast signal, and frequency modulation broadcasting digital optical fiber direct station employs numeral
The mode of optical fiber carries out the transmission of fm broadcast signal.Frequency modulation broadcasting digital optical fiber direct station is by two kinds of near-end machine, remote termination
Equipment forms, and system link operation principle is that near-end machine receives fm broadcast signal, filtered device, low noise amplification by antenna
Device, analog-to-digital conversion (ADC), Digital Down Convert (DDC), baseband signal carry out electro-optic conversion after using CPRI agreement framings, numeral
Optical signal is transferred to REMOTE MACHINE by optical fiber, and remote termination is through opto-electronic conversion, CPRI agreement solutions frame, Digital Up Convert (DUC), number
Mould conversion (DAC) enters power amplifier afterwards, and last high-power frequency broadcast singal is sent to covering by antenna or leakage cable
Region.
2. the digital fiber inside claim 1 can also use the transmission means of netting twine, concrete implementation method is digital biography
Defeated agreement CPRI is substituted with Ethernet protocol, optical module is substituted with network interface, optical fiber netting twine is substituted and realized.
3. in the case of long in tunnel, coverage distance can be increased by way of remote termination cascade.Remote termination has two light
Mouth (network interface), is defined as optical port (network interface) A and optical port (network interface) B.The A optical ports (network interface) of remote termination 1 and near-end machine optical port (net
Mouthful) connect, the optical signal (ethernet signal) of near-end machine is received, signal is forwarded to remote termination 2 by optical port (network interface) B again, with
This analogizes cascading multiple stages remote termination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710682877.7A CN107437950A (en) | 2017-08-04 | 2017-08-04 | A kind of tunnel fm broadcast signal numeral covering scheme and implementation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710682877.7A CN107437950A (en) | 2017-08-04 | 2017-08-04 | A kind of tunnel fm broadcast signal numeral covering scheme and implementation method |
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| CN107437950A true CN107437950A (en) | 2017-12-05 |
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| CN201710682877.7A Pending CN107437950A (en) | 2017-08-04 | 2017-08-04 | A kind of tunnel fm broadcast signal numeral covering scheme and implementation method |
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| CN101488795A (en) * | 2009-01-08 | 2009-07-22 | 福建邮科通信技术有限公司 | Optical fiber digital transmission method applied on straight-forward station |
| CN101969332A (en) * | 2010-10-26 | 2011-02-09 | 三维通信股份有限公司 | GSM digital repeater traffic statistic method |
| CN101969346A (en) * | 2010-10-26 | 2011-02-09 | 三维通信股份有限公司 | Digital optical repeater with loop protection and implementation method |
| CN102905293A (en) * | 2012-09-26 | 2013-01-30 | 浙江三维无线科技有限公司 | No-battery remote power down warning system and method for repeater |
| CN103023573A (en) * | 2012-12-31 | 2013-04-03 | 厦门胜华通信技术有限公司 | Digital optical fiber repeater system for frequency modulation broadcast |
| CN103346828A (en) * | 2013-06-28 | 2013-10-09 | 华为技术有限公司 | Method for converting cascade remote radio unit into repeater and RRU equipment |
| US20140064267A1 (en) * | 1999-04-13 | 2014-03-06 | Broadcom Corproation | Modem With Voice Processing Capability |
| CN104244397A (en) * | 2014-08-08 | 2014-12-24 | 厦门雷克通信技术工程有限公司 | Time-delay compensation method for TD-LTE optical fiber remote equipment |
-
2017
- 2017-08-04 CN CN201710682877.7A patent/CN107437950A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140064267A1 (en) * | 1999-04-13 | 2014-03-06 | Broadcom Corproation | Modem With Voice Processing Capability |
| CN200941617Y (en) * | 2005-12-19 | 2007-08-29 | 京信通信技术(广州)有限公司 | Mobile communicating directly releasing station system adopting digital IF way |
| CN201127027Y (en) * | 2007-11-30 | 2008-10-01 | 京信通信系统（中国）有限公司 | Multiple-carrier digital frequency-selecting radio frequency extension system |
| CN101488795A (en) * | 2009-01-08 | 2009-07-22 | 福建邮科通信技术有限公司 | Optical fiber digital transmission method applied on straight-forward station |
| CN101969332A (en) * | 2010-10-26 | 2011-02-09 | 三维通信股份有限公司 | GSM digital repeater traffic statistic method |
| CN101969346A (en) * | 2010-10-26 | 2011-02-09 | 三维通信股份有限公司 | Digital optical repeater with loop protection and implementation method |
| CN102905293A (en) * | 2012-09-26 | 2013-01-30 | 浙江三维无线科技有限公司 | No-battery remote power down warning system and method for repeater |
| CN103023573A (en) * | 2012-12-31 | 2013-04-03 | 厦门胜华通信技术有限公司 | Digital optical fiber repeater system for frequency modulation broadcast |
| CN103346828A (en) * | 2013-06-28 | 2013-10-09 | 华为技术有限公司 | Method for converting cascade remote radio unit into repeater and RRU equipment |
| CN104244397A (en) * | 2014-08-08 | 2014-12-24 | 厦门雷克通信技术工程有限公司 | Time-delay compensation method for TD-LTE optical fiber remote equipment |
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Application publication date: 20171205 |