CN109217937A - A kind of data receiver method and reception device - Google Patents
A kind of data receiver method and reception device Download PDFInfo
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- CN109217937A CN109217937A CN201811188544.XA CN201811188544A CN109217937A CN 109217937 A CN109217937 A CN 109217937A CN 201811188544 A CN201811188544 A CN 201811188544A CN 109217937 A CN109217937 A CN 109217937A
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
- H04B10/6971—Arrangements for reducing noise and distortion using equalisation
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Abstract
The invention discloses a kind of data receiver methods and reception device applied to light FTN-PAM4 system, the data receiver method is mainly characterized by, it is by eliminating intersymbol interference based on the unified algorithm of improved frequency domain equalizer and Maximum likelihood sequence detection, the frequency domain equalizer that wherein signal is improved, including traditional frequency domain balanced device and frequency domain postfilter, and the two is combined, process specifically includes: will receive data first and carry out Fast Fourier Transform (FFT), and generate frequency-region signal；Then frequency-region signal will be generated divided by matrix H, frequency-region signal after being equalized, matrix H is equal to frequency domain channel matrix HChannelDivided by frequency domain post filtering matrix HPostFilter；The frequency-region signal after equilibrium is finally subjected to inverse fast Fourier transform, the time-domain signal after being equalized.Time domain feed forward equalizer and post filtering in classical joint algorithm is substituted using simple frequency domain equalization algorithm in the present invention, has lower algorithm complexity while reaching higher interference elimination performance.
Description
Technical field
The present invention relates to technical field of photo communication, in particular to are applied to a kind of data receiver of light FTN-PAM4 system
Method and reception device.
Background technique
In recent years, with the fast development of data center, the transmission rate of short distance optical interconnection system reaches 400Gbit/s, in advance
Meter the year two thousand twenty reaches 1Tbit/s.It is multistage to be modulated at research and commercial neck in order to transmit the data of higher rate in finite bandwidth
Domain is widely studied.It is mutual that 4 rank pulse amplitude modulations (PAM4) have been adopted as 200G and 400G short distance light by IEEE P802.3bs
Connection standard.4*50-Gbit/s and 8*50-Gbit/s light PAM4 system is respectively short distance optical interconnection system 200-G and 400-G interface
Option.It is usually necessary to use low costs, low-power dissipation system for short distance optical interconnection.Therefore, 50-Gbit/s light PAM4 system is tended to
Using 10-G device.But since the bandwidth of 10-G device limits, receiving end needs to mend using Digital Signal Processing (DSP) algorithm
Repay the high frequency damage for receiving signal.Simultaneously, it would be desirable to control the complexity reduction system power consumption of digital signal processing algorithm.
It is bigger to transmit that super Nyquist PAM4 (FTN-PAM4) system of spectral efficient is used for bandwidth-limited systems
Capacity signal.But FTN-PAM4 system needs to compensate the serious symbol as caused by Bandwidth-Constrained using complicated DSP algorithm
Between interfere.Feed forward equalizer as everyone knows is exactly a kind of algorithm of common compensation intersymbol interference.But feed forward equalization
Device can enhance in-band noise while compensating intersymbol interference.Based on feed forward equalizer, postfilter and Maximum likelihood sequence
The unified algorithm of detection can then interfere between process symbol simultaneously and the in-band noise of enhancing.But in the algorithm, in order to effectively
It compensates inter-carrier interference and inhibits timing error, need the feed forward equalizer using half mark space and a large amount of tap numbers, therefore
The unified algorithm has very high complexity, limits FTN-PAM4 system in the application of short distance optical interconnection system.
Frequency domain equalizer is also a kind of DSP algorithm commonly used in the art, its advantage is that algorithm complexity is well below above-mentioned
Feed forward equalizer algorithm in unified algorithm.The channel matrix H of estimation can be used in traditional frequency domain balanced deviceChannelTo channel impairments
It compensates, but traditional frequency domain balanced device can equally enhance in-band noise.It is current any not yet while solving intersymbol interference
Occur with the unified algorithm based on frequency domain equalization of the in-band noise problem of enhancing.
Summary of the invention
It is existing to solve the technical problem to be solved in the present invention is to provide a kind of data receiver method and reception device
FTN-PAM4 signal acceptance method and the reception device problem that either algorithm complexity is high or performance is bad.
In order to solve the above technical problems, the present invention provides a kind of data receiver method, the described method comprises the following steps:
1) received smooth FTN-PAM4 signal is directly detected, the smooth FTN-PAM4 signal is converted into simulation electricity
Signal；
2) analog electrical signal is converted into digital FTN-PAM4 signal；
3) the number FTN-PAM4 signal is subjected to intersymbol interference and eliminates output 4 signal of Digital PAM；
4) 4 signal of Digital PAM is decoded, obtains the reception data of bit sequence form.
It is characterized in that,
Step 3) is described to carry out digital FTN-PAM4 signal the process that output 4 signal of Digital PAM is eliminated in intersymbol interference
It specifically includes:
3-1) frequency domain equalizer that the number FTN-PAM4 signal improves is handled；
Maximum likelihood sequence detection 3-2) is carried out to the signal after equilibrium and exports 4 signal of Digital PAM；
Step 3-1) frequency domain equalizer that the number FTN-PAM4 signal improves is handled, it is equal using traditional frequency domain
Weighing apparatus and frequency domain postfilter, and the two is combined, process specifically includes:
Fast Fourier Transform (FFT) 3-11) is carried out to the number FTN-PAM4 signal, is transformed to frequency-region signal；
Frequency domain equalization 3-12) is carried out to the frequency-region signal after Fast Fourier Transform (FFT)；The transfer matrix H that frequency domain equalization uses
=HChannel/HPostFilter, HChannelFor the frequency channels matrix of estimation, HPostFilterIt is transmitted for the frequency domain of frequency domain postfilter
Matrix；
Inverse fast Fourier transform 3-13) is carried out to the signal after frequency domain equalization, the time domain PAM4 letter after recovering equilibrium
Number.
The present invention is mainly characterized by step 3) and uses based on improved frequency domain equalizer and Maximum likelihood sequence detection
Unified algorithm carry out intersymbol interference elimination.The frequency channels matrix H of estimation can be used in traditional frequency domain balanced deviceChannel
Channel impairments are compensated, but traditional frequency domain balanced device can enhance in-band noise, the present invention makes an uproar in the band in order to reduce enhancing
Sound changes carry out the traditional method of post filtering in time domain first, uses frequency domain transfer matrix for HPostFilterFrequency domain after filter
Wave, then by being transmitted to digital FTN-PAM4 signal by traditional frequency domain balanced device and the combination of above-mentioned frequency domain postfilter
Matrix is H=HChannel/HPostFilterImproved frequency domain equalization, simplify the structure of frequency domain equalizer.
Tests prove that the improved frequency domain equalizer of the present invention be able to achieve in background technique unified algorithm feed forward equalizer and
The same function of post filtering is inevitably introduced between having known symbol and is interfered equally in the frequency domain equalization improved, but
The interference can be eliminated easily by Maximum likelihood sequence detection, therefore, the present invention is based on improved frequency domain equalizer and most
Maximum-likelihood Sequence Detection unified algorithm can reach similar with feed forward equalizer, postfilter and Maximum Likelihood Detection unified algorithm
Superperformance, still, due to frequency domain equalizer of the invention complexity well below feed forward equalizer and postfilter calculation
Method complexity, therefore, the present invention is based on the complexity phases of improved frequency domain equalizer and Maximum likelihood sequence detection unified algorithm
It is substantially reduced again than under.
Further, the step 2) process that analog electrical signal is converted to digital FTN-PAM4 signal specifically includes:
The analog electrical signal 2-1) is subjected to analog-to-digital conversion, generates digital signal；
Serioparallel exchange 2-2) is carried out to the digital signal, generates parallel digital signal；
The prefix and suffix for 2-3) removing the parallel digital signal export number FTN-PAM4 signal.
Further, 4 signal of the Digital PAM that step 4) offsets after interfering between divided-by symbol is decoded to obtain bit sequence
The process of the reception data of form specifically includes:
4-1) 4 signal of Digital PAM is decoded；
Parallel-serial conversion 4-2) is carried out to decoded data, generates the reception data of bit sequence form.
Further, step 3-2) Maximum likelihood sequence detection is carried out to the signal after equilibrium, using Viterbi algorithm.
The present invention also provides a kind of data sink, described device includes:
Direct detection unit, for directly being detected to received smooth FTN-PAM4 signal, by the smooth FTN-PAM4
Signal is converted to analog electrical signal；
FTN-PAM4 signal conversion unit, for the analog electrical signal to be converted to digital FTN-PAM4 signal；
Unit is eliminated in intersymbol interference, eliminates output number for the number FTN-PAM4 signal to be carried out intersymbol interference
Word PAM4 signal；
Decoding unit is decoded for 4 signal of the Digital PAM after eliminating to intersymbol interference, obtains bit sequence
The reception data of column form；
It is characterized in that,
Unit is eliminated in the intersymbol interference
Frequency domain equalization subelement, the frequency domain equalization for being improved to the number FTN-PAM4 signal, with eliminate by
The intersymbol interference that light FTN-PAM4 system introduces, reduces the in-band noise of enhancing, while it is dry also to introduce known intersymbol
It disturbs；
Maximum likelihood sequence detection subelement, for carrying out Maximum likelihood sequence detection output number to the signal after equilibrium
PAM4 signal recovers 4 signal of Digital PAM to eliminate the known intersymbol interference introduced；
The frequency domain equalization subelement includes:
Fast Fourier transform module, for carrying out Fast Fourier Transform (FFT), transformation to the number FTN-PAM4 signal
For frequency-region signal；
Frequency domain equalization module, for carrying out frequency domain equalization to the frequency-region signal after Fast Fourier Transform (FFT)；Frequency domain equalization makes
Transfer matrix H=HChannel/HPostFilter, HChannelFor the frequency channels matrix of estimation, HPostFilterFor frequency domain post filtering
The frequency domain transfer matrix of device；
Inverse fast Fourier transform module is restored for carrying out inverse fast Fourier transform to the signal after frequency domain equalization
Time domain PAM4 signal after equilibrium out.
Further, the FTN-PAM4 signal conversion unit includes:
Analog-to-digital conversion subelement generates digital signal for the analog electrical signal to be carried out analog-to-digital conversion；
Serioparallel exchange subelement generates parallel digital signal for carrying out serioparallel exchange to the digital signal；
Prefix and suffix remove subelement, for removing the prefix and suffix output number FTN- of the parallel digital signal
PAM4 signal.
Further, the decoding unit includes:
PAM4 decoding subunit, for being decoded to 4 signal of Digital PAM；
Parallel-serial conversion subelement generates the reception of bit sequence form for carrying out parallel-serial conversion to decoded data
Data.
Further, the Maximum likelihood sequence detection subelement carries out most the signal after equilibrium using Viterbi algorithm
Maximum-likelihood Sequence Detection.
Compared with the prior art, the invention has the following beneficial effects:
The present invention proposes the data receiver based on improved frequency domain equalizer and Maximum likelihood sequence detection unified algorithm
Method and reception device, and the unified algorithm can handle the in-band noise of intersymbol interference and the enhancing of FTN-PAM4 system simultaneously,
Reach based on feed forward equalizer, postfilter performance similar or even more superior with Maximum Likelihood Detection unified algorithm, but by
In use frequency domain equalizer algorithm complexity well below feed forward equalizer and the algorithm of postfilter complexity, therefore this
Invention data receiver method and reception device can substantially reduce the complexity of algorithm again；In short, data receiver method of the present invention and
Reception device can substantially reduce algorithm compared to feed forward equalizer, postfilter and Maximum Likelihood Detection unified algorithm is based on
Complexity compared to traditional frequency domain equalizer algorithm, and can greatly promote the performance of algorithm, and in terms of comprehensive, data of the present invention connect
Receiving method and device are able to maintain lower computational complexity while obtaining good performance.
Detailed description of the invention
Fig. 1 is a kind of structure chart of data sink of the embodiment of the present invention one；
Fig. 2 is a kind of flow chart of data receiver method of the embodiment of the present invention two；
(a) is the structure chart based on feed forward equalizer, postfilter and Maximum likelihood sequence detection unified algorithm in Fig. 3；
(b) is that the present invention is based on the structures of improved frequency domain equalizer and Maximum likelihood sequence detection unified algorithm in Fig. 3
Figure；
(a) is the eye figure of the received FTN-PAM4 signal of light FTN-PAM4 system in Fig. 4 (without DSP algorithm processing)；
(b) is the eye figure of the FTN-PAM4 signal exported through traditional frequency domain balanced device in Fig. 4；
(c) is the eye figure of the FTN-PAM4 signal through the improved frequency domain equalizer output of the present invention in Fig. 4；
Fig. 5 is respectively by the present invention is based on the data of improved frequency domain equalizer and Maximum likelihood sequence detection unified algorithm
Method of reseptance and traditional frequency domain balanced device are applied to the performance ratio of the bit error rate shown after 56-Gbit/s FTN-PAM4 system
Compared with figure；
Fig. 6 is respectively by the present invention is based on the data of improved frequency domain equalizer and Maximum likelihood sequence detection unified algorithm
Method of reseptance and traditional data receiver method based on feed forward equalizer, postfilter and Maximum likelihood sequence detection unified algorithm
Performance applied to the bit error rate shown after 56-Gbit/s FTN-PAM4 system compares figure.
Specific embodiment
In conjunction with attached drawing and corresponding embodiment, invention is further described in detail.It should be appreciated that described herein
Specific examples are only used to explain the present invention, and the scope of protection of the present invention is not limited.
Embodiment one
A kind of structure of data sink of embodiment one is as shown in Figure 1, include direct detection unit 11, FTN-PAM4
Unit 13 and decoding unit 14 are eliminated in signal conversion unit 12, intersymbol interference.Wherein, direct detection unit 11, FTN-PAM4
Signal conversion unit 12, intersymbol interference eliminate unit 13 and decoding unit 14 is sequentially connected.
Direct detection unit 11 is for directly detecting received smooth FTN-PAM4 signal, by the smooth FTN-PAM4
Signal is converted to analog electrical signal.
FTN-PAM4 signal conversion unit 12 is used to the analog electrical signal being converted to digital FTN-PAM4 signal.This reality
Apply in example, FTN-PAM4 signal conversion unit 12 include analog-to-digital conversion subelement 121, serioparallel exchange subelement 122 and prefix and
Suffix removes subelement 123.Wherein, serioparallel exchange subelement 122 is gone with analog-to-digital conversion subelement 121 and prefix and suffix respectively
Except subelement 123 connects.Analog-to-digital conversion subelement 121 is used to the analog electrical signal carrying out analog-to-digital conversion, generates number letter
Number；Serioparallel exchange subelement 122 is used to carry out serioparallel exchange to the digital signal, generates parallel digital signal；Prefix is with after
Sew prefix and suffix that removal subelement 123 is used to remove the digital signal, generates number FTN-PAM4 signal.
Intersymbol interference eliminates unit 13 and is used to carrying out the FTN-PAM4 signal into intersymbol interference to eliminate output number
PAM4 signal.In the present embodiment, it includes that frequency domain equalization subelement 131 and Maximum likelihood sequence are examined that unit 13 is eliminated in intersymbol interference
Survey subelement 132.Wherein, frequency domain equalization subelement 131 and Maximum likelihood sequence detection subelement 132 connect.Frequency domain equalization
Unit 131 is used for the frequency domain equalization improved to the number FTN-PAM4 signal, is drawn with eliminating by light FTN-PAM4 system
The intersymbol interference entered reduces the in-band noise of enhancing, while can also introduce known intersymbol interference；Maximum likelihood sequence inspection
It surveys subelement 132 to be used to carry out Maximum likelihood sequence detection to the signal after equilibrium to export 4 signal of Digital PAM, be introduced with eliminating
Known intersymbol interference recover 4 signal of Digital PAM.In the present embodiment, Maximum likelihood sequence detection subelement 132 is adopted
Maximum likelihood sequence detection is carried out to the signal after equilibrium with Viterbi algorithm.
In the present embodiment, above-mentioned frequency domain equalization subelement 131 include sequentially connected fast Fourier transform module 131a,
Frequency domain equalization module 131b and inverse fast Fourier transform module 131c.Wherein, fast Fourier transform module 131a for pair
The number FTN-PAM4 signal carries out Fast Fourier Transform (FFT), is transformed to frequency-region signal；Frequency domain equalization module 131b for pair
Frequency-region signal after Fast Fourier Transform (FFT) carries out frequency domain equalization；The transfer matrix H=H that frequency domain equalization usesChannel/
HPostFilter, HChannelFor the frequency channels matrix of estimation, HPostFilterFor the frequency domain transfer matrix of frequency domain postfilter；Quickly
Fourier inverse transform module 131c is used to carry out inverse fast Fourier transform to the signal after frequency domain equalization, after recovering equilibrium
Time domain PAM4 signal.
PAM4 signal data after decoding unit 14 is used to eliminate intersymbol interference is decoded, and obtains bit sequence shape
The reception data of formula.Decoding unit 14 includes PAM4 decoding subunit 141 and parallel-serial conversion subelement 142.Wherein, PAM4 is decoded
Subelement 141 is connect with parallel-serial conversion subelement 142.PAM4 decoding subunit 141 is used to carry out 4 signal of Digital PAM
Decoding；Parallel-serial conversion subelement 142 is used to carry out parallel-serial conversion to decoded data, generates the reception number of bit sequence form
According to.
Embodiment two
The data receiver method flow chart of embodiment two is as shown in Figure 2, comprising the following steps:
Step s201 directly detects received smooth FTN-PAM4 signal, and the smooth FTN-PAM4 signal is converted
For analog electrical signal.
The analog electrical signal is carried out analog-to-digital conversion, generates digital signal by step s202.
Step s203 carries out serioparallel exchange to the digital signal, generates parallel signal.
Step s204 removes its prefix to the parallel signal and suffix generates parallel FTN-PAM4 signal.
Step s205 carries out Fast Fourier Transform (FFT) to the parallel FTN-PAM4 signal, is transformed to frequency-region signal.
Step s206 carries out frequency domain equalization to the data after Fast Fourier Transform (FFT)；The transfer matrix H that frequency domain equalization uses
=HChannel/HPostFilter, HChannelFor the frequency channels matrix of estimation, HPostFilterIt is transmitted for the frequency domain of frequency domain postfilter
Matrix.
Step s207 carries out inverse fast Fourier transform to the data after frequency domain equalization, the time domain after recovering equilibrium
PAM4 signal.
Step s208 carries out Maximum likelihood sequence detection to the signal of step s207 output.
Step s209 makes decisions decoding to the signal of Maximum likelihood sequence detection output.
Step s210 carries out parallel-serial conversion to the data of Decision Decoding output and generates the reception data that bit sequence is formed.
Fig. 3 is based on feed forward equalizer, time domain postfilter and Maximum likelihood sequence detection unified algorithm and base of the present invention
In the comparison of improved frequency domain equalizer and the structure chart of Maximum likelihood sequence detection unified algorithm.The improved frequency domain of the present invention is equal
Weighing apparatus combines traditional frequency domain balanced device and frequency domain postfilter, specific combination: improved frequency domain equalizer uses transmitting
Matrix H=HChannel/HPostFilter, HChannelFor the frequency channels matrix of estimation, HPostFilterFor the frequency domain of frequency domain postfilter
Transfer matrix, the combination also simplify the structure of traditional frequency domain balanced device association frequency domain postfilter.The present invention is based on improved
Frequency domain equalizer and Maximum likelihood sequence detection unified algorithm not only replaceable tradition based on feed forward equalizer, postfilter and most
Maximum-likelihood Sequence Detection unified algorithm, and there is greater advantage in terms of algorithm complexity, correlation data is shown in that (Fig. 6's says Fig. 6
It is bright to see below).
Fig. 4 is for comparing traditional frequency domain balanced device and the improved frequency domain equalizer of the present invention in terms of data processing performance
Difference.(a) is reflected in Fig. 4, due to serious intersymbol interference and noise, receive FTN-PAM4 signal present 7 layers it is fuzzy
Eye figure.(b) is reflected in Fig. 4, and by traditional frequency domain equalizer compensation intersymbol interference, the PAM4 signal of recovery is due to enhancing
4 layers of fuzzy eye figure are presented in in-band noise.(c) is reflected in Fig. 4, and improved frequency domain equalizer is handled simultaneously through the invention
The FTN-PAM4 signal of the in-band noise of the intersymbol interference as caused by channel impairments and enhancing, recovery has clearly 7 layers of eye
Figure.Although introducing known intersymbol interference, Maximum Likelihood Detection can eliminate the interference of above-mentioned introducing easily.Fig. 4 is whole
It reflects, data receiver method of the present invention and device, compared to traditional frequency domain balanced device, there is better performance.
Fig. 5 is respectively by the present invention is based on the data of improved frequency domain equalizer and Maximum likelihood sequence detection unified algorithm
Method of reseptance and traditional frequency domain balanced device are applied to the performance ratio of the bit error rate shown after 56-Gbit/s FTN-PAM4 system
Compared with figure, wherein corresponding frequency domain post filtering coefficient is set as 0.8.
Two broken lines are respectively indicated based on improved frequency domain equalizer and Maximum likelihood sequence detection unified algorithm below Fig. 5
56-Gbit/s light FTN-PAM4 system have, do not have (BTB) transmit 10-km standard single-mode fiber after bit error rate performance, from
The variation tendency of this two broken lines can see, and difference is little between them, illustrate that above system is truly feasible.
A broken line reflects above Fig. 5, is being passed using the 56-Gbit/s light FTN-PAM4 system of traditional frequency domain balanced device
After defeated 10-km standard single-mode fiber, when received optical power is lower than -9dBm, 7% forward error correction thresholding is not achieved in the bit error rate；And it adopts
With the 56-Gbit/s light FTN-PAM4 system of the method for the present invention when received optical power is greater than -12dBm, before the bit error rate is lower than 7%
To Error Correct Threshold.Illustrate the method for the present invention opposite traditional frequency domain balanced device in terms of serious damage in processing FTN-PAM4 system
With greater advantage.
Fig. 6 is respectively by the present invention is based on the data of improved frequency domain equalizer and Maximum likelihood sequence detection unified algorithm
Method of reseptance and traditional data receiver method based on feed forward equalizer, postfilter and Maximum likelihood sequence detection unified algorithm
Performance applied to the bit error rate shown after 56-Gbit/s FTN-PAM4 system compares figure.In conventional method, feed forward equalization
Device can be using recurrence least square adaptive algorithm or lowest mean square adaptive algorithm training tap coefficient.Fig. 6 middle polyline shows
Method performance of the invention is better than the conventional method using lowest mean square adaptive algorithm, adapts to calculate with using recurrence least square
The conventional method of method is close.Meanwhile algorithm (frequency domain equalizer) complexity of the invention is 12 every bits of multiplication, and adopt
It is the every bit of 1428 multiplication and use with the conventional method of recurrence least square adaptive algorithm (feed forward equalizer, postfilter)
The conventional method of lowest mean square adaptive algorithm (feed forward equalizer, postfilter) is 93 every bits of multiplication.Therefore of the invention
Algorithm complexity will be well below conventional method.
Fig. 5 and result shown in fig. 6 are it can be proved that the present invention is based on improved frequency domain equalizers and Maximum likelihood sequence to examine
The signal acceptance method and device for surveying unified algorithm can be handled simultaneously in the band of intersymbol interference and enhancing of FTN-PAM4 system
Noise.Compared to traditional frequency domain balanced device, the present invention has better performance；Compared to based on feed forward equalizer, post filtering and maximum
Likelihood detection unified algorithm, the present invention have similar or even more superior performance, but since the complexity of frequency domain equalizer is remote
Complexity far below the complexity of feed forward equalizer and postfilter, therefore inventive algorithm substantially reduces.
Although for illustrative purposes, the preferred embodiment of the present invention has been disclosed, those skilled in the art will recognize
It is various improve, increase and replace be also it is possible, therefore, the scope of the present invention should be not limited to the above embodiments.
Claims (8)
1. a kind of data receiver method, the described method comprises the following steps:
1) received smooth FTN-PAM4 signal is directly detected, the smooth FTN-PAM4 signal is converted into analog telecommunications
Number；
2) analog electrical signal is converted into digital FTN-PAM4 signal；
3) the number FTN-PAM4 signal is subjected to intersymbol interference and eliminates output 4 signal of Digital PAM；
4) 4 signal of Digital PAM is decoded, obtains the reception data of bit sequence form；
It is characterized in that,
Step 3) the process that digital FTN-PAM4 signal is carried out intersymbol interference elimination output 4 signal of Digital PAM is specific
Include:
3-1) frequency domain equalizer that the number FTN-PAM4 signal improves is handled；
Maximum likelihood sequence detection 3-2) is carried out to the signal after equilibrium and exports 4 signal of Digital PAM；
Step 3-1) frequency domain equalizer that the number FTN-PAM4 signal improves is handled, using traditional frequency domain balanced device
With frequency domain postfilter, and the two is combined, treatment process specifically includes:
Fast Fourier Transform (FFT) 3-11) is carried out to the number FTN-PAM4 signal, is transformed to frequency-region signal；
Frequency domain equalization 3-12) is carried out to the frequency-region signal after Fast Fourier Transform (FFT)；The transfer matrix H=that frequency domain equalization uses
HChannel/HPostFilter, HChannelFor the frequency channels matrix of estimation, HPostFilterSquare is transmitted for the frequency domain of frequency domain postfilter
Battle array；
Inverse fast Fourier transform 3-13) is carried out to the signal after frequency domain equalization, the time domain PAM4 signal after recovering equilibrium.
2. data receiver method as described in claim 1, which is characterized in that step 2) is described to be converted to number for analog electrical signal
The process of word FTN-PAM4 signal specifically includes:
The analog electrical signal 2-1) is subjected to analog-to-digital conversion, generates digital signal；
Serioparallel exchange 2-2) is carried out to the digital signal, generates parallel digital signal；
The prefix and suffix for 2-3) removing the parallel digital signal export number FTN-PAM4 signal.
3. data receiver method as described in claim 1, which is characterized in that step 4) offsets described after interfering between divided-by symbol
The process that 4 signal of Digital PAM is decoded to obtain the reception data of bit sequence form specifically includes:
4-1) 4 signal of Digital PAM is decoded；
Parallel-serial conversion 4-2) is carried out to decoded data, generates the reception data of bit sequence form.
4. data receiver method as described in claim 1, which is characterized in that step 3-2) maximum is carried out to the signal after equilibrium
Likelihood Sequence Detection, using Viterbi algorithm.
5. a kind of data sink, described device include:
Direct detection unit, for directly being detected to received smooth FTN-PAM4 signal, by the smooth FTN-PAM4 signal
Be converted to analog electrical signal；
FTN-PAM4 signal conversion unit, for the analog electrical signal to be converted to digital FTN-PAM4 signal；
Unit is eliminated in intersymbol interference, eliminates output number for the number FTN-PAM4 signal to be carried out intersymbol interference
PAM4 signal；
Decoding unit is decoded for 4 signal of the Digital PAM after eliminating to intersymbol interference, obtains bit sequence shape
The reception data of formula；
It is characterized in that,
Unit is eliminated in the intersymbol interference
Frequency domain equalization subelement, the frequency domain equalization for being improved to the number FTN-PAM4 signal, to eliminate by light
The intersymbol interference that FTN-PAM4 system introduces, reduces the in-band noise of enhancing, while can also introduce known intersymbol interference；
Maximum likelihood sequence detection subelement exports Digital PAM 4 for carrying out Maximum likelihood sequence detection to the signal after equilibrium
Signal recovers 4 signal of Digital PAM to eliminate the known intersymbol interference introduced；
The frequency domain equalization subelement includes:
Fast Fourier transform module is transformed to frequency for carrying out Fast Fourier Transform (FFT) to the number FTN-PAM4 signal
Domain signal；
Frequency domain equalization module, for carrying out frequency domain equalization to the frequency-region signal after Fast Fourier Transform (FFT)；What frequency domain equalization used
Transfer matrix H=HChannel/HPostFilter, HChannelFor the frequency channels matrix of estimation, HPostFilterFor frequency domain postfilter
Frequency domain transfer matrix；
Inverse fast Fourier transform module recovers for carrying out inverse fast Fourier transform to the signal after frequency domain equalization
Time domain PAM4 signal after weighing apparatus.
6. data sink as claimed in claim 5, which is characterized in that the FTN-PAM4 signal conversion unit includes:
Analog-to-digital conversion subelement generates digital signal for the analog electrical signal to be carried out analog-to-digital conversion；
Serioparallel exchange subelement generates parallel digital signal for carrying out serioparallel exchange to the digital signal；
Prefix and suffix remove subelement, for removing the prefix and suffix output number FTN-PAM4 of the parallel digital signal
Signal.
7. data sink as claimed in claim 6, which is characterized in that the decoding unit includes:
PAM4 decoding subunit, for being decoded to 4 signal of Digital PAM；
Parallel-serial conversion subelement generates the reception data of bit sequence form for carrying out parallel-serial conversion to decoded data.
8. data sink as claimed in claim 8, which is characterized in that the Maximum likelihood sequence detection subelement is adopted
Maximum likelihood sequence detection is carried out to the signal after equilibrium with Viterbi algorithm.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111555816A (en) * | 2020-05-14 | 2020-08-18 | 兰州理工大学 | 4 PAM-super Nyquist rate atmospheric optical transmission method |
| CN115842740A (en) * | 2021-08-13 | 2023-03-24 | 华为技术有限公司 | Equalizer adjusting method, equalizer adjusting device and receiver |
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| US20120281789A1 (en) * | 2007-12-21 | 2012-11-08 | Broadcom Corporation | Characterizing channel response using data tone decision feedback |
| CN103814539A (en) * | 2011-09-08 | 2014-05-21 | 松下电器产业株式会社 | Signal generating method and signal generating apparatus |
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| CN101277142A (en) * | 2007-02-27 | 2008-10-01 | 法国原子能委员会 | Maximum likelihood decoder for pulse and amplitude position modulation multi-source system |
| US20120281789A1 (en) * | 2007-12-21 | 2012-11-08 | Broadcom Corporation | Characterizing channel response using data tone decision feedback |
| CN103814539A (en) * | 2011-09-08 | 2014-05-21 | 松下电器产业株式会社 | Signal generating method and signal generating apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111555816A (en) * | 2020-05-14 | 2020-08-18 | 兰州理工大学 | 4 PAM-super Nyquist rate atmospheric optical transmission method |
| CN115842740A (en) * | 2021-08-13 | 2023-03-24 | 华为技术有限公司 | Equalizer adjusting method, equalizer adjusting device and receiver |
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| CN109217937B (en) | 2020-07-10 |
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