CN114143154A - OFDM modulation-based single-twisted-pair Ethernet transmission system and method - Google Patents
OFDM modulation-based single-twisted-pair Ethernet transmission system and method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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Abstract
The invention discloses a single twisted pair Ethernet transmission system and a method based on OFDM modulation, comprising a transmitter and a receiver; the transmitter is used for receiving data transmitted by Ethernet, segmenting the transmitted data into data frames, respectively sending the data frames into different channels, respectively performing data processing and digital-to-analog conversion on the data frames under the different channels to generate analog signals, and coupling the analog signals into a single twisted pair for transmission; the receiver is used for receiving analog signals in a single twisted pair, obtaining OFDM digital signals by performing analog-to-digital conversion on the analog signals, performing synchronization and channel estimation and equalization processing on the OFDM digital signals under different channels to obtain signals before decoding, performing data processing on the signals before decoding to obtain correct data, and transmitting the correct data under different channels to the Ethernet. The invention can improve the transmission bandwidth and transmission distance of the system and ensure the real-time performance and the certainty of Ethernet data transmission.
Description
Technical Field
The invention relates to the technical field of signal transmission, in particular to a single-pair twisted-pair Ethernet transmission system and a single-pair twisted-pair Ethernet transmission method based on OFDM modulation.
Background
Industrial ethernet, as an efficient local area network, is a key component of modern industrial automation systems and the foundation of intelligent plant construction. The dual-wire ethernet adopts a single twisted pair to transmit data and supply power, so that the hardware cost of a network system can be reduced, and the wiring capacity in a unit volume can be increased, which is a development trend of the industrial ethernet. At present, the problems of incomplete standard, lack of special chips and rare industrial application scenes exist.
For the industrial communication field, real-time and deterministic are the developing direction, and high bandwidth and long distance transmission are also the requirements of applications. At present, all the traditional industrial ethernet communication physical layers are single carrier Modulation technologies based on PAM (Pulse Amplitude Modulation), and although single carrier Modulation is relatively mature in the field of wired transmission, there are disadvantages of short transmission distance, poor interference immunity, and the like in practical application. After the physical layer adopts a multichannel Frequency Division Multiplexing technology based on OFDM (Orthogonal Frequency Division Multiplexing), sound, image and data information can be transmitted in one channel, so that the system has multiple purposes; one broadband channel can be divided into a plurality of logic baseband channels to realize multiplexing, so that the capacity of the channel is greatly increased; the long distance of broadband transmission has great advantages in practical application.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a single twisted pair ethernet transmission system and method based on OFDM modulation, which can improve the transmission bandwidth and transmission distance of the system, support the minimum cycle period, and ensure the real-time performance and certainty of ethernet data transmission.
In order to implement the technical content, the invention provides a single twisted pair ethernet transmission system based on OFDM modulation, comprising: a transmitter and a receiver;
the transmitter is used for receiving data transmitted by Ethernet, segmenting the transmitted data into data frames, respectively sending the data frames into different channels, respectively carrying out data processing on the data frames under the different channels to generate F-OFDM signals, carrying out digital-to-analog conversion on the F-OFDM signals to generate analog signals, and coupling the analog signals into a single twisted pair for transmission;
the receiver is used for receiving analog signals in a single twisted pair, obtaining OFDM digital signals by performing analog-to-digital conversion on the analog signals, performing synchronization and channel estimation and equalization processing on the OFDM digital signals under different channels to obtain signals before decoding, performing data processing on the signals before decoding to obtain correct data, and transmitting the correct data under different channels to the Ethernet.
Preferably, the transmitter includes: the system comprises a scrambling module, a cascade coding module, an interleaving module, a modulation module, an IFFT module, a pilot frequency inserting module, a cyclic prefix adding and windowing module and a two-wire system analog front end signal transmitting module;
the scrambling module, the cascade coding module, the interleaving module, the modulation module, the IFFT module, the pilot frequency insertion module, the cyclic prefix adding and windowing module and the two-wire system analog front end signal transmitting module are connected in sequence, and the pilot frequency insertion module is connected with the IFFT module.
Preferably, the receiver includes: the device comprises a frame detection and symbol synchronization module, a cyclic prefix removal module, an FFT module, a channel estimation and equalization module, a sampling frequency synchronization module, a demodulation module, a de-interleaving module, a decoding module, a descrambling module and a two-wire analog front end signal receiving module;
the two-wire analog front end signal receiving module, the cyclic prefix removing module, the FFT module, the demodulation module, the de-interleaving module, the decoding module and the descrambling module are sequentially connected, the frame detection and symbol synchronization module and the sampling frequency synchronization module are respectively connected with the cyclic prefix removing module, and the channel estimation and equalization module is respectively connected with the FFT module and the demodulation module.
Preferably, the two-wire analog front-end signal transmitting module includes a DAC module and a differential amplifying module.
Preferably, the two-wire analog front end signal receiving module comprises a PGA module and an ADC module; the PGA module is used for receiving analog signals in the single twisted pair, and dynamically adjusting the power of the received signals according to the distance of signal transmission.
Preferably, the DAC module and the ADC module acquire a clock signal through a crystal oscillator.
Preferably, in the system, when the single twisted pair cable performs data transmission, four-channel data transmission is supported, where the four channels include a 1.536-16.896MHz frequency band, a 16.896-32.256MHz frequency band, a 32.256-47.616MHz frequency band, and a 47.616-62.976MHz frequency band, and the four channels independently configure parameters and subcarrier spacing, and simultaneously transmit periodic data and aperiodic data.
Preferably, the four channels independently configure parameters and subcarrier intervals according to different working modes, and simultaneously transmit periodic data and aperiodic data; wherein the operation mode comprises a duplex operation mode of TDD and FDD.
Preferably, the working mode is set through manual modulation or adaptive modulation, wherein the adaptive modulation adaptively adjusts working parameters according to the working environment and the condition of a single twisted pair channel through a dynamic channel transmission model;
the dynamic signal transmission model comprises that a training sequence is sent to a transmitter in advance, a receiving end carries out pre-estimation on the channel condition according to the loss in the transmission process after receiving the sequence, and modulation orders of different channels are selected according to the pre-estimation result.
In order to better achieve the technical effects, the invention also provides a single-twisted-pair Ethernet transmission method based on OFDM modulation, which comprises the following steps:
receiving data transmitted by Ethernet, segmenting the transmitted data into data frames, respectively sending the data frames into different channels, respectively carrying out data processing on the data frames under the different channels to generate F-OFDM signals, carrying out digital-to-analog conversion on the F-OFDM signals to generate analog signals, and coupling the analog signals into a single twisted pair for transmission;
receiving analog signals in a single twisted pair, performing analog-to-digital conversion on the analog signals to obtain OFDM digital signals, performing synchronization and channel estimation and equalization processing on the OFDM digital signals under different channels to obtain signals before decoding, performing data processing on the signals before decoding to obtain correct data, and transmitting the correct data under different channels to the Ethernet.
The invention has the following technical effects:
the invention adopts a multi-channel frequency division multiplexing high-bandwidth transmission technology based on a wired physical medium, adds an optional scheme on the basis of a single-pair twisted-pair Ethernet PAM modulation technology, adopts an OFDM technology to simultaneously support time division multiplexing and frequency division multiplexing, improves the transmission bandwidth and transmission distance of a system, supports the minimum cycle period and ensures the real-time property and the certainty of Ethernet data transmission.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a diagram of a PAM modulation-based single twisted pair Ethernet transmission system;
FIG. 2 is a schematic diagram of the general structure of a single twisted pair Ethernet transmission system based on OFDM modulation;
FIG. 3 is a schematic diagram of a two-wire analog front end device;
fig. 4 is a flowchart of steps of a method for implementing a single twisted pair ethernet transmission system based on OFDM modulation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
In order to solve the problems existing in the prior art, the invention provides the following scheme:
in the single-twisted-pair Ethernet transmission system based on OFDM modulation, an OFDM (Orthogonal Frequency Division Multiplexing) technology is innovatively used in a physical layer of a single-twisted-pair Ethernet, and compared with a traditional single-carrier modulation technology, the technology can greatly improve the utilization rate of an Ethernet Frequency band and improve the anti-interference capability during channel transmission, and is particularly suitable for industrial Ethernet environment. Meanwhile, the bandwidth is not reduced while the Ethernet data transmission distance is increased, and the method is particularly used for industrial Ethernet sites with medium-distance and high-bandwidth requirements.
As shown in fig. 1, fig. 1 is a structure diagram of a conventional single twisted pair ethernet transmission system based on PAM modulation in the prior art, where a GMII interface receives MPDUs (Media Protocol Data units) transmitted by a MAC chip, and the MPDUs are subjected to simple scrambling and encoding processing at a PCS layer, and Data is mainly processed at an analog part, including operations such as compensating for echo and insertion loss, decoding the Data, and the like, so that the implementation difficulty is high, the system is complex, and the requirement on the analog technology is high.
The multi-channel frequency division multiplexing high-bandwidth transmission technology is adopted in the single-pair twisted-pair Ethernet physical layer, and is different from the traditional single-carrier modulation technology. When using multichannel frequency division multiplexing technology, the transmitter firstly divides the data transmitted by the MAC into frames with fixed length according to the working mode, and then sends the frames into different channels according to the priority of the data frames for data processing. In each channel, the input data is firstly scrambled and then sent to a forward error correction processing unit for cascade coding operation, and the code length of the cascade coding is different according to different working modes so as to provide different error correction capabilities. Then interleaving and modulating are carried out, different modulation modes correspond to different bandwidths, and pilot frequency insertion operation is carried out for subsequent channel estimation and equalization. After the data processed by each channel is subjected to serial-parallel conversion, the data is subjected to IFFT and windowing processing to form CP-OFDM modulation, and the number of IFFT points of different channels is different and is determined by a working mode. Then, each channel data is separately subjected to low-pass filtering by using a digital filter to effectively inhibit out-of-band, four channels of data are superposed to form a baseband signal, and the baseband signal is modulated by using a special single twisted pair analog front end device and then is coupled into a single twisted pair for transmission;
the receiver receives baseband signals through a dedicated single-pair twisted-pair analog front end transposition, symbol sequences are extracted by using digital filters of respective channels, and then the signals are sent to FFT to complete demodulation of CP-OFDM, demodulated data needs to be sent to a channel estimation and equalization module to be processed so as to compensate interference and noise generated by the twisted-pair channels, the compensated data is respectively decoded through a demodulation module and a decoding module in a forward error correction processing unit, and the decoded data can be sent back to MAC.
The system carries out a series of processing on the data of the Ethernet MAC (media Access Control), sends the data to a signal transmitting module at the analog front end in the form of OFDM symbols, modulates the signals to a plurality of subcarriers of a single twisted pair baseband to be transmitted, receives the signals from the subcarriers at a receiving end, demodulates the signals into the OFDM symbols, restores the OFDM symbols into the Ethernet data through synchronous processing and the like, and finishes the transmission and the reception of the whole system. Compared with a single carrier system, due to the adoption of OFDM modulation, the baseband channel supports different subcarrier intervals, has different minimum cycle periods, and meets different requirements on real-time performance in different application scenes of the industrial Ethernet. Meanwhile, the signal is widened in the time domain, so that the signal can be transmitted for a longer distance, and the requirement of an industrial field on medium-distance data transmission is met.
The single-twisted-pair Ethernet transmission system is applied to industrial Ethernet and vehicle-mounted Ethernet physical layers, is compatible with the traditional single-twisted-pair physical layer, simultaneously supports more extension functions, and provides higher bandwidth and longer transmission distance.
The system has multiple working modes, and different working modes correspond to different bandwidth and real-time requirements, so that the requirements of different scenes can be met. And meanwhile, four-channel data grid-connected transmission is supported, each channel can be independently configured, and the method can be used for periodic and non-periodic data grid-connected transmission. And the duplex working modes of TDD and FDD are simultaneously supported, multi-user access is supported, and the flexibility is higher. The working mode of the system can be manually selected or the system can be modulated in a self-adaptive manner, and the most appropriate working parameters are automatically selected by a built-in dynamic channel transmission model according to the working environment and the twisted pair channel condition so as to ensure that the transmission quality is not influenced.
The system adopts a multi-carrier transmission technology to simultaneously support 4-channel data transmission on a single twisted pair wire, support a 1.536-16.896MHz frequency band, support a 16.896-32.256MHz frequency band, support a 32.256-47.616MHz frequency band, support a 47.616-62.976MHz frequency band, independently configure parameters for four channels, independently set subcarrier intervals, simultaneously transmit periodic data and aperiodic data required by industry, and support multi-user access. Due to the fact that the multi-carrier bandwidth is larger, the transmission distance and the anti-interference capacity are increased. According to different application scenes, the subcarrier interval, namely the minimum cycle period of the modulation data, can be adjusted, so that the method is applied to scenes with different requirements on real-time performance, and different requirements are met.
The system adopts the multi-channel Frequency Division multiplexing transmission technology, and can simultaneously support TDD (Time Division Duplexing) or FDD (Frequency Division Duplexing) when a single-pair twisted-pair network transmits data, so that the system has stronger flexibility. When the TDD works, the working mode of the system is divided according to time, the sending and receiving time is evenly distributed, and the single twisted pair four channels can only send or receive data at the same time, which is the same as the traditional single twisted pair working mode. When the FDD is adopted, the four channels can be independently configured into uplink or downlink, two uplink channels and two downlink channels are usually adopted, the bandwidths of the uplink and downlink data are the same, and the real full-duplex work is realized.
The dynamic channel transmission model built in the system can send a training sequence to the opposite terminal in advance before data transmission every time, the opposite terminal can pre-estimate the channel condition according to the loss in the transmission process after receiving the training sequence, evaluate the quality condition of each subcarrier channel, select a proper modulation order according to the channel condition, adopt high-order modulation for a stable channel and adopt low-order modulation for an unstable channel. Thereby maximizing channel capacity while ensuring that system bandwidth is not affected.
As shown in fig. 2, a specific structure of a single twisted pair ethernet transmission system based on OFDM modulation implemented by the present invention mainly includes: the transmitter comprises a scrambling module, a cascade coding module, an interleaving module, a modulation module, an IFFT module, a pilot frequency inserting module, a cyclic prefix adding and windowing module, a two-wire system analog front end signal transmitting module and the like. The receiver comprises a frame detection and symbol synchronization module, a cyclic prefix removal module, an FFT module, a channel estimation and equalization module, a sampling frequency synchronization module, a demodulation module, a de-interleaving module, a decoding module, a descrambling module, a two-wire analog front end signal receiving module and the like. The function of each module is as follows:
the scrambling module is used for randomly processing the bit level of the digital signal and reducing the occurrence of the connection 0 and the connection 1, thereby reducing the intersymbol interference and the jitter and facilitating the clock extraction of a receiving end; meanwhile, the frequency spectrum of the baseband signal is expanded, and the encryption effect is achieved;
the cascade coding module is used for correcting and detecting errors of transmission data, reducing the error rate of transmission and providing coding gain;
the interleaving module is used for improving the performance of the concatenated codes, providing frequency isolation, reducing frequency selective attenuation and narrow-band interference and improving burst error correction performance;
the modulation module is used for converting the baseband signal into a signal suitable for channel transmission, so that the transmission efficiency is improved;
the IFFT module is used for converting a frequency domain into a time domain and quickly realizing orthogonal superposition of subcarriers;
the pilot frequency insertion module is used for quickly carrying out frame detection and symbol synchronization by using known pilot frequency data, and can be used for channel estimation and sampling frequency synchronization, so that the accuracy is improved and the use of resources is reduced;
adding a cyclic prefix and windowing module for eliminating ISI (Inter Symbol Interference) and reducing the out-of-band power of OFDM symbols;
the two-wire analog front end signal transmitting module is used for converting the OFDM digital signal into an analog signal and transmitting the analog signal to a channel, and simultaneously carrying out filtering and power amplification processing;
the frame detection and symbol synchronization module is used for detecting data which is transmitted in a burst mode on a channel and accurately positioning the position of an OFDM symbol at the same time, so that subsequent demodulation processing is facilitated;
a cyclic prefix removing module for removing the previously added cyclic prefix;
the FFT module is used for converting a time domain into a frequency domain and demodulating the orthogonal superposed subcarriers;
and the channel estimation and equalization module is used for estimating the time domain or frequency domain response of the channel, and correcting and recovering the received data to obtain the performance gain of coherent detection.
And the sampling frequency synchronization module is used for eliminating the influence caused by the deviation between the sampling period and the phase of a transmitter DAC (Digital to analog converter) and a receiver ADC (analog to Digital converter), and keeping the orthogonality of the subcarriers.
Demodulation module, de-interleaving module, decoding module and de-scrambling module, and inverse process of transmitter partial function.
And the two-wire analog front-end signal receiving module is used for converting the analog signals on the twisted pair into OFDM digital signals, sending the OFDM digital signals to a subsequent module for processing, and adjusting the receiving power according to the transmission distance.
As shown in fig. 3, the main components of a two-wire analog front end signal transmit and receive module are shown. Mainly comprises PGA, ADC, DAC, crystal oscillator and differential amplifier. The main workflow of transmitting and receiving signals is as follows:
when data is sent, an OFDM symbol data stream is obtained from a front processing module, digital-to-analog conversion is firstly carried out through a DAC (digital-to-analog converter), oversampling is needed, and a needed analog signal is obtained; after the analog signal is obtained, because the transmission distance is long, the signal needs to be subjected to differential amplification operation, the signal is amplified with constant power during transmission, and the amplified signal is transmitted to the twisted pair wire; when receiving data, firstly obtaining an analog signal from a twisted pair wire, and dynamically adjusting the power of the received signal through PGA according to the signal transmission distance so as to ensure that most of signals can be received; then sending the received analog signal to ADC for analog-to-digital conversion to obtain the required OFDM digital signal, and sending the OFDM digital signal to a subsequent module for processing;
the crystal oscillator provides the required clock for the high-speed ADC and DAC.
Example two
The invention also provides a single twisted pair Ethernet transmission method based on OFDM modulation, which comprises the following steps:
fig. 4 is a flowchart of steps of a method for implementing OFDM modulation-based single twisted pair ethernet transmission according to the present invention. As shown in fig. 4, the present invention implements a single twisted pair ethernet transmission system based on OFDM modulation, including the following steps:
firstly, acquiring an MPDU (Media Protocol Data Unit) from an MAC chip through a GMII interface, and distributing the Data Unit to four channels with different frequency bands according to requirements;
the data in each channel is firstly scrambled, then is forward coded by a cascade coding system, and then is interleaved coded to obtain a coded data unit.
The coded data unit needs to be modulated in high order, and the data of different subcarriers are modulated in different orders according to the condition of a channel, so that the total bandwidth of the system is ensured to be unchanged, and the modulated data needs to be inserted into pilot signals in sequence, wherein the pilot signals comprise training sequence pilot and block pilot.
And after modulation is finished, the data inserted with the pilot frequency needs to be subjected to fast Fourier transform to finish the conversion from a frequency domain to a time domain, and then cyclic prefix adding and windowing are carried out to obtain CP-OFDM data.
And respectively filtering the data of each sub-band by using a low-pass filter according to different parameters of each sub-band to obtain F-OFDM data.
The processed F-OFDM data needs to be sent to an analog front end AFE for digital-to-analog conversion and power amplification, and the modulated signal is coupled to a twisted-pair channel for transmission.
During receiving, analog signals are received from a twisted-pair channel, the receiving power needs to be dynamically adjusted according to the transmission distance to ensure the integrity of the received signals, and then the independent filtering of each sub-band is carried out to remove noise and interference.
The obtained OFDM digital signal needs to be synchronized, including symbol synchronization and sampling frequency synchronization, and channel estimation and equalization operations are also needed to obtain a more accurate signal before decoding.
Finally, the data is demodulated, deinterleaved, and the correct data can be obtained through the operations of cascade decoding and descrambling. And sending the data of the four channels to the MAC for processing after the data of the four channels are separated or combined.
In summary, the OFDM modulation-based single-pair twisted-pair ethernet transmission system is a novel single-pair twisted-pair ethernet physical layer implementation scheme, and the scheme can implement all functions of conventional single-carrier modulation ethernet transmission, and meanwhile, due to the adoption of a multi-carrier modulation technology, the transmission distance can be increased under the condition of maintaining the transmission bandwidth, the interference resistance in the transmission process can be improved, and meanwhile, the minimum cycle period of transmission can be adjusted according to different application scenes, so that the scheme is applied to industrial scenes with different real-time requirements, and has the advantages of higher flexibility, wider applicability and good application prospect.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The single twisted pair Ethernet transmission system based on OFDM modulation is characterized by comprising: a transmitter and a receiver;
the transmitter is used for receiving data transmitted by Ethernet, segmenting the transmitted data into data frames, respectively sending the data frames into different channels, respectively carrying out data processing on the data frames under the different channels to generate F-OFDM signals, carrying out digital-to-analog conversion on the F-OFDM signals to generate analog signals, and coupling the analog signals into a single twisted pair for transmission;
the receiver is used for receiving the analog signals in the single twisted pair, obtaining OFDM digital signals by performing analog-to-digital conversion on the analog signals, performing synchronization and channel estimation and equalization processing on the OFDM digital signals under different channels to obtain signals before decoding, performing data processing on the signals before decoding to obtain correct data, and transmitting the correct data under different channels to the Ethernet.
2. The OFDM modulation based single twisted pair ethernet transmission system according to claim 1, wherein: the transmitter includes: the system comprises a scrambling module, a cascade coding module, an interleaving module, a modulation module, an IFFT module, a pilot frequency inserting module, a cyclic prefix adding and windowing module and a two-wire system analog front end signal transmitting module;
the scrambling module, the cascade coding module, the interleaving module, the modulation module, the IFFT module, the pilot frequency insertion module, the cyclic prefix adding and windowing module and the two-wire system analog front end signal transmitting module are connected in sequence, and the pilot frequency insertion module is connected with the IFFT module.
3. The OFDM modulation based single twisted pair ethernet transmission system according to claim 1, wherein: the receiver includes: the device comprises a frame detection and symbol synchronization module, a cyclic prefix removal module, an FFT module, a channel estimation and equalization module, a sampling frequency synchronization module, a demodulation module, a de-interleaving module, a decoding module, a descrambling module and a two-wire analog front end signal receiving module;
the two-wire analog front end signal receiving module, the cyclic prefix removing module, the FFT module, the demodulation module, the de-interleaving module, the decoding module and the descrambling module are sequentially connected, the frame detection and symbol synchronization module and the sampling frequency synchronization module are respectively connected with the cyclic prefix removing module, and the channel estimation and equalization module is respectively connected with the FFT module and the demodulation module.
4. The OFDM modulation based single twisted pair ethernet transmission system according to claim 2, wherein: the two-wire analog front end signal transmitting module comprises a DAC module and a differential amplifying module.
5. The single twisted pair ethernet transmission system based on OFDM modulation according to claim 3, wherein: the two-wire analog front end signal receiving module comprises a PGA module and an ADC module; the PGA module is used for receiving analog signals in the single twisted pair, and dynamically adjusting the power of the received signals according to the distance of signal transmission.
6. The single twisted pair ethernet transmission system based on OFDM modulation according to claim 4 or 5, wherein: and the DAC module and the ADC module acquire clock signals through crystal oscillators.
7. The OFDM modulation based single twisted pair ethernet transmission system according to claim 1, wherein: in the system, when the single twisted pair is used for data transmission, four-channel data transmission is supported, wherein four channels comprise a 1.536-16.896MHz frequency band, a 16.896-32.256MHz frequency band, a 32.256-47.616MHz frequency band and a 47.616-62.976MHz frequency band, and the four channels are independently configured with parameters and subcarrier intervals and simultaneously transmit periodic data and aperiodic data.
8. The single twisted pair ethernet transmission system based on OFDM modulation according to claim 7, wherein:
the four channels independently configure parameters and subcarrier intervals according to different working modes and simultaneously transmit periodic data and aperiodic data; wherein the operation mode comprises a duplex operation mode of TDD and FDD.
9. The single twisted pair ethernet transmission system based on OFDM modulation according to claim 8, wherein:
the working mode is set through manual modulation or adaptive modulation, wherein the adaptive modulation adaptively adjusts working parameters according to the working environment and the condition of a single twisted pair channel through a dynamic channel transmission model;
the dynamic signal transmission model comprises that a training sequence is sent to a transmitter in advance, a receiving end carries out pre-estimation on the channel condition according to the loss in the transmission process after receiving the sequence, and modulation orders of different channels are selected according to the pre-estimation result.
10. The single twisted pair Ethernet transmission method based on OFDM modulation is characterized in that: the method comprises the following steps:
receiving data transmitted by Ethernet, segmenting the transmitted data into data frames, respectively sending the data frames into different channels, respectively carrying out data processing on the data frames under the different channels to generate F-OFDM signals, carrying out digital-to-analog conversion on the F-OFDM signals to generate analog signals, and coupling the analog signals into a single twisted pair for transmission;
receiving analog signals in a single twisted pair, performing analog-to-digital conversion on the analog signals to obtain OFDM digital signals, performing synchronization and channel estimation and equalization processing on the OFDM digital signals under different channels to obtain signals before decoding, performing data processing on the signals before decoding to obtain correct data, and transmitting the correct data under different channels to the Ethernet.
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| CN116996543A (en) * | 2023-09-27 | 2023-11-03 | 之江实验室 | Vehicle-mounted Ethernet communication method and device based on orthogonal frequency division multiplexing |
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| CN116996543B (en) * | 2023-09-27 | 2024-01-09 | 之江实验室 | Vehicle-mounted Ethernet communication method and device based on orthogonal frequency division multiplexing |
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