CN105357163B - Realize the system physical layer and its implementation of next-generation coaxial ethernet technology - Google Patents
Realize the system physical layer and its implementation of next-generation coaxial ethernet technology Download PDFInfo
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- CN105357163B CN105357163B CN201510673732.1A CN201510673732A CN105357163B CN 105357163 B CN105357163 B CN 105357163B CN 201510673732 A CN201510673732 A CN 201510673732A CN 105357163 B CN105357163 B CN 105357163B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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Abstract
The invention discloses a kind of system physical layers and its implementation for realizing next-generation coaxial ethernet technology,The system physical layer includes basic channel and extended channel,Media protocol data cell is sent to the forward error correction processing unit of basic channel and extended channel by the MAC of transmitter respectively,Respectively after basic channel and extended channel serioparallel exchange,The basic channel completes CP OFDM modulation by IFFT and windowing process,Symbol is respectively mapped to different IFFT and completes F OFDM modulation by the extended channel,Receiver extracts the symbol sebolic addressing of basic channel and extended channel using basic channel finite impulse response filter and extended channel finite impulse response filter,The symbol sebolic addressing of the basic channel completes CP OFDM demodulations by FFT,The symbol sebolic addressing of extended channel completes F OFDM demodulations by corresponding FFT,System throughput and bandwidth availability ratio can be improved in the present invention.
Description
Technical field
The present invention relates to coaxial ethernet technologys, more particularly to a kind of system for realizing next-generation coaxial ethernet technology
Physical layer and its implementation.
Background technology
Coaxial cable is the main medium for realizing cable TV signal access, and video, audio, digital TV in high resolution, 3D are regarded
The fusion of frequency etc. constitutes the primary demand of current family wired TV, and the broadband service business based on cable TV network structure is just
It is the glamour place of coaxial Ethernet network technology.High-throughput is the base that coaxial Ethernet provides high reliability and high coverage rate
Plinth, however, the frequency-selective channel and various noises that are present in coaxial cable are the main of the coaxial ethernet communication of realization
Challenge.
China Broadcast ＆ Television general bureau has promulgated cable tv coax broadband access EOC standard C-HPAV (standards in 2013
Number GY/T 269-2013).C-HPAV is derived from 1901 standards of IEEE, and is expanded.However, with demand for services
Increase, C-HPAV technologies have been difficult to meet the needs of people.Currently, for the skill of next-generation C-HPAV standards (C-NGHPAV)
Art vision is it has been determined that physical layer (PHY) is made of the PHY and extension PHY of C-HPAV1.0.Wherein, the PHY symbols of C-HPAV1.0
Close the regulation of GY/T 269-2013.Extending PHY includes：Expansion system operating frequency range, LDPC forward error correction coding modes,
Support enhancing OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing) modulating mode
With transmission mechanism.However new technology but has lost part throughput while enhancing PHY robustness.
Fig. 1 is the schematic diagram of the ofdm system framework based on filter in the prior art, as shown in Figure 1,
By two-way, by CP-OFDM, (data after (cyclic prefix Cyclic Prefix, CP) processing are added, the symbol after being added
Sequence realizes isomery subband in fixed frequency range and fills, and realizes that the condition that two-way is directly added is CP-OFDM (cyclic prefix
Cyclic Prefix, CP) output sampling rate is consistent.
C-HPAV 1.0 is communicated using basic channel, and C-NGHPAV is communicated using extended channel.MAC is by basic channel and expansion
The MPDU (Media Protocol Data Unit, media protocol data cell) of exhibition channel is sent to FEC1 (Forward respectively
Error Correction, forward error correction) and FEC2.Different channels use the IFFT of different length (quickly according to specific needs
Inverse Fourier transform) realize different subcarrier bandwidth, using the position of IFFT symbols mapping come optimized integration channel band and
The division of extended channel frequency band.FIR (Finite Impulse Response, filter are utilized by the modulated symbol sebolic addressings of OFDM
Wave device) to effectively being inhibited with outer so that the interference between subband is minimum, and ensures no sub-carrier power loss, and two
Road signal is coupled to transmission in coaxial cable after being added.Receiver obtains baseband signal by AFE(analog front end) and ABB, using not
Same FIR (Finite Impulse Response, finite impulse response filter) is to the symbol of basic channel and extended channel
Sequence extracts, and FIR herein needs very high exponent number, admittedly use frequency domain filtering.The symbol sebolic addressing of different channels is by solution
Reason and decoding are mediated, finally, sends decoding result back to MAC.
Currently, MAC (Media Access Control media intervene control layer) layer multi-access mode is TDMA (Time
Division Multiple Access, time division multiple acess), duplex mode is TDD (Time Division Duplexing, the time-division
Duplex technology).C-HPAV1.0 is communicated using basic channel, and C-NGHPAV is communicated using extended channel, and the priority of the latter is high.
As two generation CNU (Coaxial-Cable Network Unit, coaxial network unit) while to the CLT with extended channel function
When (Coaxial-cable Line Terminal, coaxial line terminal) sends out request, need by priority-based
CSMA (Carrier Sense Multiple Access, Carrier Sense Multiple Access) mode competes initial access channel.Extend
System response time, reduce system throughput.
In addition, in the prior art, FFT (Fast Fourier Transformation, Fast Fourier Transform (FFT)) output symbols
It number needs by windowing process or raised cosine filter molding output so that be inhibited outside the band at frequency band fluting.But
The effect of this forming technique is limited to roll-off factor, and then Out-of-band rejection is apparent for roll-off factor increase, still, but with elongation sign
Duration is cost, reduces system throughput.
Invention content
In order to overcome the deficiencies of the above existing technologies, purpose of the present invention is to provide a kind of realization it is next-generation coaxially with
The too system physical layer and its implementation of network technology, using the orthogonal frequency division multiplexi based on filter as PHY's
Basic waveform, modification MAC reduce system response time in logical relations of the CNU when being initially accessed channel of different editions；
Make basic channel and extended channel simultaneously when channel spacing is a subcarrier spacing while communicating, improves physical layer and handle up
Rate so that all subband transmitted in parallel of extended channel, the gap size and subcarrier fluting number between subband are equal, are promoted
System throughput.
In view of the above and other objects, the present invention proposes a kind of system physical for realizing next-generation coaxial ethernet technology
The MAC of layer, including basic channel and extended channel, transmitter believes the basis handled by AFE(analog front end) and Analog Baseband
Before the media protocol data cell of road and extended channel is sent to the forward error correction processing unit and extended channel of basic channel respectively
To correction process unit, respectively after basic channel serioparallel exchange and extended channel serioparallel exchange, which passes through
CP-OFDM modulation is completed in IFFT and windowing process, which is respectively mapped to different IFFT by symbol and completes F-OFDM
Modulation, is utilized respectively basic channel finite impulse response filter by the modulated symbol sebolic addressings of OFDM and extended channel is limited
For impulse response filter to effectively being inhibited with outer, two paths of signals obtains baseband signal after being added, which passes through mould
It is coupled to transmission in coaxial cable after quasi- front end modulation；Receiver handles to obtain base band letter by AFE(analog front end) and Analog Baseband
Number, using basic channel finite impulse response filter and extended channel finite impulse response filter to basic channel and extension
The symbol sebolic addressing of channel extracts, and the symbol sebolic addressing of the basic channel completes CP-OFDM demodulation by FFT, extended channel
Symbol sebolic addressing completes F-OFDM demodulation by corresponding FFT, and the signal after demodulation through basic channel and extended channel and is gone here and there respectively
Respectively using completing to translate after the forward error correction processing unit of basic channel and extended channel forward error correction processing unit after conversion
Code sends decoding result back to MAC.
Further, C-HPAV 1.0 is communicated using basic channel, supports 7.6MHz~30MHz frequency bands, optional support
7.6MHz~65MHz frequency bands, C-NGHPAV are communicated using extended channel, and the frequency range of extended channel can be clever in 65MHz~1GHz
It is living selected.
Further, which is applied to cable TV network, and the cable TV network is comprising coaxial line terminal and together
Axis network element.
Further, include two generation products in coaxial network unit when coaxial line terminal has the function of extended channel,
When carrying out uplink communication, two generation coaxial network units carry out information back, the coaxial line to coaxial line terminal simultaneously
Terminal utilizes the finite impulse response filter in F-OFDM frameworks to extract basic channel and extended channel respectively, without passing through
CSMA modes compete initial access channel priority-based, next-generation coaxial network unit can utilize simultaneously basic channel and
Extended channel is communicated.
Further, when downlink communication, when coaxial line terminal is to previous generation coaxial network unit transmission datas,
Basic channel link only need to be enabled, when to next-generation coaxial network unit transmission data, basic channel and extended channel can
To work at the same time, next-generation coaxial network unit can utilize parallel principle receive basic channel and extended channel simultaneously at this time
Signal does at MAC and merges.
Further, it when the coaxial line terminal does not have extended channel function, is produced comprising two generations in coaxial network unit
Product, when uplink communication, next-generation coaxial network unit only needs enabled basic channel, when downlink communication, next-generation coaxial network list
Member is without doing specially treated.
Further, the basic channel and extended channel communicate simultaneously when channel spacing is a subcarrier spacing.
Further, which makes all subband transmitted in parallel of extended channel, and the gap size between subband and son carry
Wave fluting number is equal.
In order to achieve the above objectives, the present invention also provides a kind of system physical layers for realizing next-generation coaxial ethernet technology
Implementation method includes the following steps：
The MAC of step 1, transmitter believes the basic channel handled by AFE(analog front end) and Analog Baseband and extension
The media protocol data cell in road is sent to forward error correction processing unit and the extended channel forward error correction processing of basic channel respectively
Unit respectively passes through basic channel serioparallel exchange and extended channel serioparallel exchange；
Step 2, basic channel complete CP-OFDM modulation by IFFT and windowing process, and extended channel different sub-band passes through
After corresponding FIR extractions, by corresponding IFFT processing, F-OFDM modulation is completed；
Step 3 is utilized respectively basic channel finite impulse response filter and expansion by the modulated symbol sebolic addressings of OFDM
Channel finite impulse response filter is opened up to effectively being inhibited with outer so that the interference between subband is minimum so that basis letter
Interference between road and extended channel is minimum, and ensures no sub-carrier power loss, and two paths of signals obtains base band after being added
Signal, which, which is coupled to after AFE(analog front end) is modulated in coaxial cable, transmits.
Step 4, receiver handle to obtain baseband signal, have using basic channel by AFE(analog front end) and Analog Baseband
Limit impulse response filter and extended channel finite impulse response filter to the symbol sebolic addressing of basic channel and extended channel into
Row extraction；
The symbol sebolic addressing of step 5, basic channel completes CP-OFDM demodulation, the symbol sebolic addressing warp of extended channel by FFT
It crosses corresponding FFT and completes F-OFDM demodulation, the signal after demodulation is respectively through basic channel and extended channel parallel-serial conversion and extension
Channel parallel-serial conversion；
Step 6, two groups of signals respectively using basic channel forward error correction processing unit and extended channel forward error correction at
Decoding is completed after managing unit, finally, sends decoding result back to MAC.
Further, C-HPAV 1.0 is communicated using basic channel, supports 7.6MHz~30MHz frequency bands, optional support
7.6MHz~65MHz frequency bands, C-NGHPAV are communicated using extended channel, and the frequency range of extended channel can be clever in 65MHz~1GHz
It is living selected.
Compared with prior art, a kind of system physical layer for realizing next-generation coaxial ethernet technology of the present invention and its realization
Method, using the orthogonal frequency division multiplexi based on filter as the basic waveform of PHY, MAC is in different editions for modification
Logical relations of the CNU when being initially accessed channel, reduces system response time；Basic channel and extended channel is set to believe simultaneously
It when being divided into a subcarrier spacing between road while communicating, reduces system response time so that all subbands of extended channel are simultaneously
Row is sent, and the gap size and subcarrier fluting number between subband are equal, improve system throughput.
Description of the drawings
Fig. 1 is the schematic diagram of the ofdm system framework based on filter in the prior art；
Fig. 2 is a kind of system architecture diagram of system physical layer that realizing next-generation coaxial ethernet technology of the present invention；
Fig. 3 is CLT network diagrams；
Fig. 4 A- Fig. 4 B are that whether there is or not the power spectral density normalized frequency distribution maps of FIR by the present invention；
Fig. 5 is frequency band fluting schematic diagram；
The step of Fig. 6 is a kind of implementation method of system physical layer for realizing next-generation coaxial ethernet technology of the present invention is flowed
Cheng Tu.
Specific implementation mode
Below by way of specific specific example and embodiments of the present invention are described with reference to the drawings, those skilled in the art can
Understand the further advantage and effect of the present invention easily by content disclosed in the present specification.The present invention can also pass through other differences
Specific example implemented or applied, details in this specification can also be based on different perspectives and applications, without departing substantially from
Various modifications and change are carried out under the spirit of the present invention.
Fig. 2 is a kind of system architecture diagram of system physical layer that realizing next-generation coaxial ethernet technology of the present invention.Such as Fig. 2
It is shown, a kind of system physical layer for realizing next-generation coaxial ethernet technology of the present invention, including basic channel and extended channel, C-
HPAV 1.0 is communicated using basic channel, and C-NGHPAV is communicated using extended channel, and the MAC of transmitter will pass through AFE(analog front end)
The basic channel and extended channel that AFE and Analog Baseband ABB processing obtain MPDU (Media Protocol Data Unit,
Media protocol data cell) it is sent to forward error correction processing unit FEC1 and the extended channel forward error correction processing of basic channel respectively
Unit F EC2 respectively passes through basic channel serioparallel exchange Mapping1 and extended channel serioparallel exchange Mapping2, basic later
Channel completes CP-OFDM modulation by IFFT and windowing process, and symbol is respectively mapped to different IFFT and completed by extended channel
F-OFDM is modulated, and basic channel finite impulse response filter FIR1 and expansion are utilized respectively by the modulated symbol sebolic addressings of OFDM
Channel finite impulse response filter FIR2-n is opened up to effectively being inhibited with outer so that the interference between subband is minimum, and
Ensure that no sub-carrier power loss, two paths of signals obtain baseband signal after being added, baseband signal is after AFE(analog front end) is modulated
It is coupled to transmission in coaxial cable；Receiver obtains baseband signal by AFE(analog front end) AFE and Analog Baseband ABB processing, profit
With basic channel finite impulse response filter FIR1 and extended channel finite impulse response filter FIR2-n to basic channel
It being extracted with the symbol sebolic addressing of extended channel, FIR herein needs very high exponent number, admittedly use frequency domain filtering, basic channel
Symbol sebolic addressing complete CP-OFDM demodulation by FFT, the symbol sebolic addressing of extended channel completes F-OFDM solutions by corresponding FFT
It adjusts, the signal after demodulation is respectively through basic channel parallel-serial conversion De-Mapping1 and extended channel parallel-serial conversion De-Mapping2
Parallel-serial conversion is completed, two groups of signals are respectively using basic channel forward error correction processing unit FEC1 and extended channel forward error correction
Decoding is completed after processing unit FEC2, finally, sends decoding result back to MAC.Herein it should be noted that, the present invention in extended channel
There is k IFFT/FFT, the wherein quantity of k is consistent with the number of sub-bands in frequency band.
Fig. 3 is the CLT network diagrams with extended channel function in the present invention, for the CLT in C-NGHPAV networks
May include in practical applications two generation products simultaneously with the communication network of CNU.
Include two generation products in CNU when CLT has the function of extended channel.When carrying out uplink communication, two generation CNU
Information back is carried out to CLT simultaneously, CLT utilizes the FIR in F-OFDM frameworks to extract basic channel and extended channel respectively, nothing
Initial access channel need to be competed by CSMA modes priority-based.Next-generation CNU (NG-CNU) can utilize basis simultaneously
Channel and extended channel are communicated, lifting system throughput and band efficiency；When downlink communication, if CLT pairs
When previous generation CNU transmission datas, only basic channel link need to be enabled.When to NG-CNU transmission datas, due to
System dual-mode is TDD, and basic channel and extended channel can work at the same time, and NG-CNU at this time can utilize parallel principle
The signal for receiving basic channel and extended channel simultaneously, does in MAC and merges.
Include two generation products in CNU when CLT does not have extended channel function.When uplink communication, NG-CNU PHY only need to make
It can basic channel.When downlink communication, NC-CNU is without doing specially treated.
The present invention without high-order windowing process or increases raised cosine filter roll-off factor using F-OFDM technologies
Apparent Out-of-band rejection at frequency band fluting is realized, without increasing the duration of symbol, lifting system throughput.
Specifically, in the present invention, primary channel is the working channel of C-HPAV1.0 systems, meets GY/T 269-2013's
Regulation supports 7.6MHz~30MHz frequency bands, optional support 7.6MHz~65MHz frequency bands；Extended channel is except primary channel
The frequency range of the channel of extension, extended channel can flexibly be selected in 65MHz~1GHz.It is needed between extended channel and basic channel
Reserved subband protection interval, it is general to choose 10% subband bandwidth, largely waste band resource.
And that the present invention is based on the PHY intersubbands of F-OFDM is noiseless between only needing 1 subcarrier that can realize subband,
Improve band efficiency.
Dotted line is PSD (Power spectral density of the extended channel (Link B) without filtering in Fig. 4 (A)
Power spectral density), solid line is the PSD after basic channel (Link A) is added with extended channel, and band has been depressed into -60dB outside.
By Fig. 4 (A) it can be seen that filter can be seen that adjusting extended channel to the inhibition situation outside band by Fig. 4 (B) figures PSD
The position of subcarrier maps, when a subcarrier is slotted, the PSD subband adjacents after merging are -30dB.Above-mentioned base
Plinth channel and extended channel can analogize to the subband of arbitrary neighborhood.The figure can equally analogize to arbitrary two in extended channel
A subband (as shown in figure 5, having 9 subbands), can in the case where differing a subcarrier fluting between any two subband
Power inhibits at fluting to reach -30dB.It should be noted that, it is only herein to provide schematic diagram here, specific sub-band number
Mesh needs to slot standard according to North America to determine
Fig. 5 is present pre-ferred embodiments midband fluting schematic diagram.It please coordinate with reference to figure 2, Fig. 2 median filters FIR1 is
Basic channel, basic channel is still according to C-HPAV1.0 standard implementations.FIR2~FIRn is extended channel, extended channel it is every
Each subband in one filter corresponding diagram 5, n at this time take 10 correspondence, 9 subbands.The centre frequency of each subband is logical
IFFT mapping positions are crossed to determine, this process can be pre-set using Mapping modules.It is thereby achieved that in a frequency band
All subbands are sent simultaneously, significantly lifting system throughput.
The step of Fig. 6 is a kind of implementation method of system physical layer for realizing next-generation coaxial ethernet technology of the present invention is flowed
Cheng Tu.As shown in fig. 6, a kind of implementation method of system physical layer that realizing next-generation coaxial ethernet technology of the present invention, including
Following steps：
Step 601, the MAC of transmitter by the basic channel obtained by AFE(analog front end) AFE and Analog Baseband ABB processing and
Before the MPDU (Media Protocol Data Unit, media protocol data cell) of extended channel is sent to basic channel respectively
To correction process unit F EC1 and extended channel forward error correction processing unit FEC2, respectively pass through basic channel serioparallel exchange
Mapping1 and extended channel serioparallel exchange Mapping2.
Step 602, basic channel completes CP-OFDM modulation by IFFT and windowing process, and extended channel distinguishes symbol
It is mapped to different IFFT and completes F-OFDM modulation.
Step 603, it is utilized respectively basic channel finite impulse response filter by the modulated symbol sebolic addressings of OFDM
FIR1 and extended channel finite impulse response filter FIR2-n with outer to effectively being inhibited so that the interference between subband is most
It is small, and ensure no sub-carrier power loss, two paths of signals obtains baseband signal after being added, before the baseband signal is by simulation
It is coupled to transmission in coaxial cable after the modulation of end.
Step 604, receiver obtains baseband signal by AFE(analog front end) AFE and Analog Baseband ABB processing, utilizes basis
Channel finite impulse response filter FIR1 and extended channel finite impulse response filter FIR2-n are to basic channel and extension
The symbol sebolic addressing of channel extracts, and FIR herein needs very high exponent number, admittedly use frequency domain filtering.
Step 605, the symbol sebolic addressing of basic channel completes CP-OFDM demodulation, the symbol sebolic addressing warp of extended channel by FFT
It crosses corresponding FFT and completes F-OFDM demodulation, the signal after demodulation is respectively through basic channel parallel-serial conversion De-Mapping1 and extension
Channel parallel-serial conversion De-Mapping2 completes parallel-serial conversion.
Step 606, two groups of signals respectively using before basic channel forward error correction processing unit FEC1 and extended channel to
Decoding is completed after correction process unit F EC2, finally, sends decoding result back to MAC.
As it can be seen that the present invention can without high-order windowing process and raising raised cosine filter roll-off factor using F-OFDM technologies
To realize apparent Out-of-band rejection at frequency band fluting, without increasing the duration of symbol, lifting system throughput.
Specifically, in the present invention, primary channel is the working channel of C-HPAV1.0 systems, meets GY/T269-2013's
Regulation supports 7.6MHz~30MHz frequency bands, optional support 7.6MHz~65MHz frequency bands；Extended channel is except primary channel
The frequency range of the channel of extension, extended channel can flexibly be selected in 65MHz~1GHz.It is needed between extended channel and basic channel
Reserved subband protection interval, it is general to choose 10% subband bandwidth, largely waste band resource.
And that the present invention is based on the PHY intersubbands of F-OFDM is noiseless between only needing 1 subcarrier that can realize subband,
Improve band efficiency.
In conclusion a kind of system physical layer and its implementation for realizing next-generation coaxial ethernet technology of the present invention,
, using the orthogonal frequency division multiplexi based on filter as the basic waveform of PHY, modification MAC exists in the CNU of different editions for it
It is initially accessed logical relation when channel, reduces system response time；Make basic channel and extended channel in interchannel simultaneously
It when being divided into a subcarrier spacing while communicating, reduces system response time so that all subband transmitted in parallel of extended channel,
Gap size and subcarrier fluting number between subband is equal, improves system throughput.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.Any
Field technology personnel can without violating the spirit and scope of the present invention, and modifications and changes are made to the above embodiments.Therefore,
The scope of the present invention, should be as listed in the claims.
Claims (4)
1. a kind of system physical layer for realizing next-generation coaxial ethernet technology, including basic channel and extended channel, feature
It is：The MAC of transmitter assists the media of the basic channel and extended channel that are handled by AFE(analog front end) and Analog Baseband
View data cell is sent to the forward error correction processing unit and extended channel forward error correction processing unit of basic channel respectively, respectively passes through
After crossing basic channel serioparallel exchange and extended channel serioparallel exchange, which completes CP- by IFFT and windowing process
OFDM is modulated, which is respectively mapped to different IFFT by symbol and completes F-OFDM modulation, modulated by OFDM
It is outer to band that symbol sebolic addressing is utilized respectively basic channel finite impulse response filter and extended channel finite impulse response filter
Effectively inhibited, two paths of signals obtains baseband signal after being added, which is coupled to together after AFE(analog front end) is modulated
Transmission in shaft cable；Receiver handles to obtain baseband signal by AFE(analog front end) and Analog Baseband, limited using basic channel
Impulse response filter and extended channel finite impulse response filter carry out the symbol sebolic addressing of basic channel and extended channel
The symbol sebolic addressing of extraction, the basic channel completes CP-OFDM demodulation by FFT, and the symbol sebolic addressing of extended channel is by corresponding
FFT completes F-OFDM demodulation, and the signal after demodulation is respectively after basic channel and extended channel parallel-serial conversion respectively using base
Decoding is completed after the forward error correction processing unit and extended channel forward error correction processing unit of plinth channel, and decoding result is sent back to
MAC, the system physical layer are applied to cable TV network, which includes coaxial line terminal and coaxial network
Unit includes two generation products when the coaxial line terminal has the function of extended channel, in the coaxial network unit, is carrying out uplink
When communication, two generation coaxial network units carry out information back to coaxial line terminal simultaneously, which utilizes
Finite impulse response filter in F-OFDM frameworks extracts basic channel and extended channel respectively, without preferential by being based on
The CSMA modes of grade compete initial access channel, and next-generation coaxial network unit is carried out using basic channel and extended channel simultaneously
Communication when coaxial line terminal is to previous generation coaxial network unit transmission datas, only need to enable basis when downlink communication
Channel link, when to next-generation coaxial network unit transmission data, basic channel and extended channel can work at the same time, this
When next generation coaxial network unit parallel principle can be utilized to receive the signal of basic channel and extended channel simultaneously, at MAC
It does and merges；Include two generation products in coaxial network unit, uplink is logical when the coaxial line terminal does not have extended channel function
When letter, next-generation coaxial network unit only needs enabled basic channel, and when downlink communication, next-generation coaxial network unit is without being spy
Different processing；The basic channel and extended channel communicate simultaneously when channel spacing is a subcarrier spacing, the system physical layer
Make all subband transmitted in parallel of extended channel, the gap size and subcarrier fluting number between subband are equal.
2. a kind of system physical layer for realizing next-generation coaxial ethernet technology as described in claim 1, it is characterised in that：C-
HPAV 1.0 is communicated using basic channel, supports 7.6MHz~30MHz frequency bands, optional support 7.6MHz~65MHz frequency bands, C-
NGHPAV is communicated using extended channel, and the frequency range of extended channel can flexibly be selected in 65MHz~1GHz.
3. a kind of implementation method of system physical layer that realizing next-generation coaxial ethernet technology, includes the following steps：
Step 1, the MAC of transmitter is by the basic channel handled by AFE(analog front end) and Analog Baseband and extended channel
Media protocol data cell is sent to the forward error correction processing unit and extended channel forward error correction processing unit of basic channel respectively,
Respectively pass through basic channel serioparallel exchange and extended channel serioparallel exchange；
Step 2, basic channel complete CP-OFDM modulation by IFFT and windowing process, and symbol is respectively mapped to by extended channel
Different IFFT completes F-OFDM modulation；
Step 3 is utilized respectively basic channel finite impulse response filter by the modulated symbol sebolic addressings of OFDM and extension is believed
Road finite impulse response filter with outer to effectively being inhibited so that interference between subband is minimum, and ensure subband it
Between without sub-carrier power lose, two paths of signals be added after obtain baseband signal, the baseband signal is after AFE(analog front end) is modulated
It is coupled to transmission in coaxial cable；
Step 4, receiver handle to obtain baseband signal by AFE(analog front end) and Analog Baseband, utilize the limited arteries and veins of basic channel
It rushes response filter and extended channel finite impulse response filter carries the symbol sebolic addressing of basic channel and extended channel
It takes；
The symbol sebolic addressing of step 5, basic channel completes CP-OFDM demodulation by FFT, and the symbol sebolic addressing of extended channel passes through phase
The FFT answered completes F-OFDM demodulation, and the signal after demodulation is respectively through basic channel and extended channel parallel-serial conversion and extended channel
Parallel-serial conversion；
Step 6, two groups of signals respectively handle using basic channel forward error correction processing unit and extended channel forward error correction single
Decoding is completed after member, finally, sends decoding result back to MAC,
The implementation method is applied to cable TV network, which includes coaxial line terminal and coaxial network list
Member includes two generation products when the coaxial line terminal has the function of extended channel, in the coaxial network unit, logical carrying out uplink
When letter, two generation coaxial network units carry out information back to coaxial line terminal simultaneously, which utilizes F-
Finite impulse response filter in OFDM frameworks extracts basic channel and extended channel respectively, without by being based on priority
CSMA modes compete initial access channel, next-generation coaxial network unit is led to using basic channel and extended channel simultaneously
Letter when coaxial line terminal is to previous generation coaxial network unit transmission datas, only need to enable basic letter when downlink communication
Road link, when to next-generation coaxial network unit transmission data, basic channel and extended channel can work at the same time, at this time
Next-generation coaxial network unit can utilize parallel principle to receive the signal of basic channel and extended channel simultaneously, be done at MAC
Merge；Include two generation products, uplink communication in coaxial network unit when the coaxial line terminal does not have extended channel function
When, next-generation coaxial network unit only needs enabled basic channel, and when downlink communication, next-generation coaxial network unit is special without doing
Processing；The basic channel and extended channel communicate simultaneously when channel spacing is a subcarrier spacing, which makes
All subband transmitted in parallel of extended channel, the gap size and subcarrier fluting number between subband are equal.
4. a kind of implementation method of system physical layer for realizing next-generation coaxial ethernet technology as claimed in claim 3,
It is characterized in that：C-HPAV 1.0 is communicated using basic channel, support 7.6MHz~30MHz frequency bands, and optional support 7.6MHz~
65MHz frequency bands, C-NGHPAV are communicated using extended channel, and the frequency range of extended channel can flexibly be selected in 65MHz~1GHz.
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| CN101808344A (en) * | 2009-08-17 | 2010-08-18 | 华中科技大学 | Ethernet passive electric network |
| CN104247406A (en) * | 2012-02-20 | 2014-12-24 | 加速有限公司 | Distributed cable modem termination system with software reconfigurable MAC and PHY capability |
| CN104272662A (en) * | 2012-05-09 | 2015-01-07 | 高通股份有限公司 | Full-duplex ethernet communications over coaxial links using time-division duplexing |
| CN104541518A (en) * | 2012-06-05 | 2015-04-22 | 华为技术有限公司 | Method and apparatus of building a coaxial convergence layer in ethernet passive optical network (PON) over coaxial network (EPOC) |
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| CN101808344A (en) * | 2009-08-17 | 2010-08-18 | 华中科技大学 | Ethernet passive electric network |
| CN104247406A (en) * | 2012-02-20 | 2014-12-24 | 加速有限公司 | Distributed cable modem termination system with software reconfigurable MAC and PHY capability |
| CN104272662A (en) * | 2012-05-09 | 2015-01-07 | 高通股份有限公司 | Full-duplex ethernet communications over coaxial links using time-division duplexing |
| CN104541518A (en) * | 2012-06-05 | 2015-04-22 | 华为技术有限公司 | Method and apparatus of building a coaxial convergence layer in ethernet passive optical network (PON) over coaxial network (EPOC) |
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