CN114257888B - Adaptive coding and equalization method for PON system and PON system - Google Patents
Adaptive coding and equalization method for PON system and PON system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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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
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Abstract
The application discloses a self-adaptive coding and equalization method for a PON system and the PON system, which relate to the field of optical access networks, and the method comprises the following steps: according to the signal-to-noise ratio and transmission distance of the channel, a corresponding modulation format and a receiving end equalization mode are selected, so that the optimal transmission rate and the lowest power consumption are obtained during data transmission. The application can fully utilize network bandwidth and save power to the greatest extent.
Description
Technical Field
The application relates to the field of optical access networks, in particular to a self-adaptive coding and equalization method for a PON system and the PON system.
Background
With the rapid growth of high-bandwidth demand services such as 4k/8k high-definition video, cloud computing and virtual reality, optical broadband access based on a passive optical network (Passive Optical Network, PON) is rapidly developing with higher capacity, larger coverage and deeper penetration. On the other hand, the requirement of the fifth generation (5G) mobile communication system for the mobile front-end network can also be achieved by a passive optical network system. The low cost of the mobile front-end will become one of the main driving forces for PON rates exceeding 10 Gb/s. Thus, single wavelength 25Gb/s, 40Gb/s, and even 50Gb/s PONs based on low cost equipment are becoming a recent hotspot.
In order to achieve high-speed transmission using low-cost devices, spectrally efficient modulation formats such as carrier-free amplitude/phase modulation (CAP) and four-level pulse amplitude modulation (PAM 4) have been widely studied, and are potential modulation schemes for high-capacity PON systems due to their simpler DSP structure and lower power consumption.
Meanwhile, a forward feedback equalizer (Feed Forward Equalization, FFE) and a decision feedback equalizer (Decision Feedback Equalization, DFE) are two simple equalizers that have been widely studied in passive optical network systems. In addition, volterra equalizers are also used to compensate for non-linearities in long-range communications.
For deployment of access networks, users distributed in cities and rural areas have the characteristics of high-density, short-distance transmission, low-density and long-distance transmission respectively. How to use a proper combination of modulation mode and receiving equalization scheme to cope with different transmission distances in the access network, meet the receiving performance of dense and sparse (such as city and rural) areas, obtain the balance between the transmission distance and the transmission rate, increase the use efficiency and flexibility of network resources, fully utilize the network bandwidth and save the power to the greatest extent, and is the problem to be solved by the application.
Disclosure of Invention
In view of the drawbacks of the prior art, a first aspect of the present application provides an adaptive coding and equalization method for PON systems, which can fully utilize network bandwidth and save power to the greatest extent.
In order to achieve the above purpose, the application adopts the following technical scheme:
an adaptive coding and equalization method for a PON system, the method comprising the steps of:
according to the signal-to-noise ratio and transmission distance of the channel, a corresponding modulation format and a receiving end equalization mode are selected, so that the optimal transmission rate and the lowest power consumption are obtained during data transmission.
In some embodiments, the selecting a corresponding modulation format and a receiving end equalization manner according to a signal-to-noise ratio and a transmission distance of a channel to obtain an optimal transmission rate and a minimum power consumption during data transmission includes:
the method comprises the steps that a sending end sends a training handshake frame to a receiving end, and configuration options of the training handshake frame can be switched from various configuration schemes comprising different modulation formats and receiving end equalization modes;
the receiving end tests the receiving performance of the training handshake frame under each configuration scheme to determine the configuration scheme capable of obtaining the optimal transmission rate and the lowest power consumption, and feeds back the configuration scheme to the sending end;
and configuring based on the feedback result of the receiving end, so that the sending end and the receiving end work under the selected configuration scheme to perform data transmission.
In some embodiments, the modulation formats include a CAP16 modulation format, a PAM8 modulation format, and a PAM4 modulation format.
In some embodiments, the receiving-side equalization method includes using only a feed-forward equalizer, using both a feed-forward equalizer and a decision-feedback equalizer, and using both a feed-forward equalizer, a decision-feedback equalizer and a Volterra equalizer.
In some embodiments, the configuration scheme includes:
the modulation format selects CAP16 modulation format, and the receiving end equalization mode selects from forward feedback equalizer, forward feedback equalizer and decision feedback equalizer, and forward feedback equalizer, decision feedback equalizer and Volterra equalizer;
the modulation format selects PAM8 modulation format, and the receiving end equalization mode selects from forward feedback equalizer, forward feedback equalizer and decision feedback equalizer, and forward feedback equalizer, decision feedback equalizer and Volterra equalizer; and
the modulation format selects PAM4 modulation format, and the receiving end equalization mode selects from forward feedback equalizer, forward feedback equalizer and decision feedback equalizer, and forward feedback equalizer, decision feedback equalizer and Volterra equalizer.
A second aspect of the present application provides a PON system which can make full use of network bandwidth and save power to the greatest extent.
In order to achieve the above purpose, the application adopts the following technical scheme:
a PON system comprising a transmitting end and a receiving end configured to: according to the signal-to-noise ratio and transmission distance of the channel, a corresponding modulation format and a receiving end equalization mode are selected, so that the optimal transmission rate and the lowest power consumption are obtained during data transmission.
In some embodiments, the transmitting end and the receiving end are configured to: according to the signal-to-noise ratio and transmission distance of the channel, selecting a corresponding modulation format and a receiving end equalization mode to obtain the optimal transmission rate and the lowest power consumption during data transmission, wherein the method specifically comprises the following steps:
the transmitting end transmits a training handshake frame to the receiving end, and configuration options of the training handshake frame can be switched from various configuration schemes comprising different modulation formats and a receiving end equalization mode;
the receiving end tests the receiving performance of the training handshake frame under each configuration scheme to determine the configuration scheme capable of obtaining the optimal transmission rate and the lowest power consumption, and feeds back the configuration scheme to the sending end;
and configuring based on the feedback result of the receiving end, so that the receiving end works under the selected configuration scheme to perform data transmission.
In some embodiments, the modulation format adopted by the transmitting end includes a CAP16 modulation format, a PAM8 modulation format and a PAM4 modulation format.
In some embodiments, the receiving equalization method adopted by the receiving end comprises adopting only a forward feedback equalizer, adopting a forward feedback equalizer and a decision feedback equalizer simultaneously, and adopting a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer simultaneously.
In some embodiments, the configuration scheme includes:
the modulation format adopted by the transmitting end and the receiving end is CAP16 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer;
the modulation format adopted by the transmitting end and the receiving end is PAM8 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer; and
the modulation format adopted by the transmitting end and the receiving end is PAM4 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer.
Compared with the prior art, the application has the advantages that:
the adaptive coding and equalization method for the PON system performs adaptive selection according to the signal-to-noise ratio conditions of different channels so as to fully utilize the advantages of high speed and link budget. According to the performance and distance requirements of the PON, a proper coding format is selected at the OLT transmitting end, and a proper equalization module is selected at the ONU receiving end, so that the PON system operates at the highest speed and the lowest power meeting the channel requirements.
Drawings
Fig. 1 is a flowchart of an adaptive coding and equalization method for a PON system according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, an embodiment of the present application provides an adaptive coding and equalization method for a PON system, which includes the following steps:
according to the signal-to-noise ratio and transmission distance of the channel, a corresponding modulation format and a receiving end equalization mode are selected, so that the optimal transmission rate and the lowest power consumption are obtained during data transmission.
It can be understood that, in the PON system, based on the signal-to-noise ratio and the transmission distance of the current channel, it is desirable to select a suitable modulation format from the transmitting end (OLT), which is also used by the receiving end, and select a suitable receiving end equalization mode at the receiving end (ONU), so as to obtain an optimal transmission rate and minimum power consumption.
In a specific implementation, the steps specifically include:
s1, a transmitting end transmits a training handshake frame to a receiving end, wherein configuration options of the training handshake frame can be switched from various configuration schemes comprising different modulation formats and a receiving end equalization mode.
S2, the receiving end tests the receiving performance of the training handshake frame under each configuration scheme to determine the configuration scheme capable of obtaining the optimal transmission rate and the lowest power consumption, and feeds back the configuration scheme to the sending end.
S3, configuring based on a feedback result of the receiving end, so that the sending end and the receiving end work under the selected configuration scheme to perform data transmission.
It should be noted that although FFE and DFE have been widely studied in passive optical network systems, for example, the commonly used low complexity FFE algorithm has a least mean squares algorithm (LMS-FFE). However, in an intensity modulation/direct detection (IM/DD) system, the performance of FFE and DFE is fundamentally limited by reduced fiber dispersion tolerance and nonlinear distortion, and transmission of 40 km and more is hardly supported. Whereas the Volterra algorithm combined with FFE and DFE has proven to be a better solution to mitigate nonlinear distortion of single carrier systems, the Volterra algorithm-based nonlinear equalizer has better performance than simple FFE and discrete fourier transforms.
Therefore, in the embodiment of the present application, the modulation formats include a CAP16 modulation format, a PAM8 modulation format, and a PAM4 modulation format.
It should be noted that the bit numbers carried by each symbol in the format of CAP16, PAM8, PAM4 are 4bit,3bit,2bit, respectively. The transmission capacity of a system using these three formats is therefore CAP16> PAM8> PAM4, while the transmission performance (i.e. the error rate under the same channel conditions) is CAP16< PAM8< PAM4, and hence the required channel conditions (signal to noise ratio) are also CAP16> PAM8> PAM4.
As for the receiving-end equalization mode, it includes employing only a feed-forward equalizer, employing both a feed-forward equalizer and a decision feedback equalizer, and employing both a feed-forward equalizer, a decision feedback equalizer and a Volterra equalizer.
For the equalizer, the forward feedback equalizer does not need to use output data as returned data to calculate the equalizing coefficient, and the decision feedback equalizer needs to use the output data to feed back to participate in the calculation of the equalizing coefficient, so that the tracking capability of the equalizer on the channel variation is stronger. The function of the forward feedback equalizer and the decision feedback equalizer in the system is to remove intersymbol interference and inter-polarization crosstalk and separate data of two polarizations. The Volterra nonlinear equalizer is mostly used for compensating nonlinear distortion of a system, when a transmission speed increases and a transmission distance increases, the nonlinearity of the system also increases, and the Volterra equalizer is needed.
The embodiment of the application carries out variable rate coding on the sending end of the PON system by adopting the CAP16/PAM8/PAM4 selectable coding format, and the receiving end carries out self-adaptive selection according to the signal-to-noise ratio conditions of different channels by adopting various balanced combination modes such as FFE/DFE/Volterra and the like so as to fully utilize the advantages of high rate and link budget. According to the performance and distance requirements of the PON, a proper coding format is selected at the OLT transmitting end, and a proper equalization module is selected at the ONU end, so that the PON system operates at the highest speed and the lowest power which meet the channel requirements.
Specifically, for PON systems, through different adaptive coding modulation and equalization schemes, configuration files may be customized for different channel conditions to fully utilize the power margin. For example, for densely populated urban areas, a high-order CAP16 modulation format is adopted, and a simple equalizer at the receiving end is matched, so that the large bandwidth requirement and high user density can be supported. On the other hand, in remote rural areas with low density, a slightly complex equalizer of a low-order PAM4 modulation format matched with a receiving end is adopted to prolong the transmission distance of the optical fiber and improve the reliability of the network.
It should be noted that, for the receiving end, a commonly used receiving end fe-DFE equalizer may be expressed as:
the simplified easy-to-implement FEE-Volterra equalizer can be expressed as:
where Y (n) represents equalizer output data. a (k) and b (k) represent tap coefficients of the forward equalizer FEE and the feedback equalizer DFE, respectively. X (n) represents equalizer input data. M, N are the number of taps of FEE and DFE equalizer, N represents nth data, and a (k, k) represents tap coefficients of Volterra equalizer, respectively.
The following PON system configuration options are thus set according to different network channel requirements, as shown in table 1. When the distance is the shortest and the channel condition is the best, configuration 1 (CAP 16/FFE) is chosen as the configuration option for this ONU to obtain the best rate and lowest power consumption. As the distance increases, the channel condition gradually worsens, and configuration 2 (CAP 16/ffe+dfe), or configuration 3 (CAP 16/ffe+dfe+volterra) is selected as the configuration selection. When the channel signal-to-noise ratio cannot support the CAP16 modulation format, then the change selects configuration 4 (PAM 8/FFE), configuration 5 (PAM 8/ffe+dfe), configuration 6 (PAM 8/ffe+dfe+volterra), or configuration 7 (PAM 4/FFE), configuration 8 (PAM 4/ffe+dfe), configuration 9 (PAM 4/ffe+dfe+volterra) with lower bit rate per symbol as the configuration selection. So as to achieve the purposes of fully utilizing the bandwidth and saving the power of the ONU terminal to the maximum extent.
Table 1 PON system adaptive configuration options
In combination with the table, after detecting a new ONU in the PON system, first the OLT sends a training handshake frame to the ONU, and the configuration options of each frame are sequentially switched from configuration 1 to configuration 9. And the ONU terminal tests the receiving error code performance of the frame data under each configuration, and sets the configuration option which meets the performance requirement at first as the next working configuration. And transmitting the configuration options back to the OLT end, so that the ONU corresponding to the OLT end can obtain the selected configuration. Thereafter the ONU operates in the selected configuration mode. By adopting the method to configure the PON network, each ONU can work at the maximum utilization of bandwidth, and the transmission rate is improved. And meanwhile, the power consumed by the ONU end is reduced.
In summary, the adaptive coding and equalization method for PON system of the present application performs adaptive selection according to signal-to-noise ratio conditions of different channels, so as to fully utilize the advantages of high rate and link budget. According to the performance and distance requirements of the PON, a proper coding format is selected at the OLT transmitting end, and a proper equalization module is selected at the ONU receiving end, so that the PON system operates at the highest speed and the lowest power meeting the channel requirements.
Meanwhile, the present application also provides a PON system, which includes a transmitting end and a receiving end configured to: according to the signal-to-noise ratio and transmission distance of the channel, a corresponding modulation format and a receiving end equalization mode are selected, so that the optimal transmission rate and the lowest power consumption are obtained during data transmission.
Further, the transmitting end and the receiving end are configured to: according to the signal-to-noise ratio and transmission distance of the channel, selecting a corresponding modulation format and a receiving end equalization mode to obtain the optimal transmission rate and the lowest power consumption during data transmission, wherein the method specifically comprises the following steps:
the transmitting end transmits a training handshake frame to the receiving end, and configuration options of the training handshake frame can be switched from various configuration schemes comprising different modulation formats and a receiving end equalization mode;
the receiving end tests the receiving performance of the training handshake frame under each configuration scheme to determine the configuration scheme capable of obtaining the optimal transmission rate and the lowest power consumption, and feeds back the configuration scheme to the sending end;
and configuring based on the feedback result of the receiving end, so that the receiving end works under the selected configuration scheme to perform data transmission.
Further, the modulation formats adopted by the transmitting end comprise a CAP16 modulation format, a PAM8 modulation format and a PAM4 modulation format.
Further, the receiving end equalization mode adopted by the receiving end comprises that only a forward feedback equalizer is adopted, and a forward feedback equalizer and a decision feedback equalizer are adopted at the same time, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer are adopted at the same time.
Further, the configuration scheme includes:
the modulation format adopted by the transmitting end and the receiving end is CAP16 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer;
the modulation format adopted by the transmitting end and the receiving end is PAM8 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer; and
the modulation format adopted by the transmitting end and the receiving end is PAM4 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer.
In summary, the PON system of the present application performs adaptive selection according to the signal-to-noise ratio conditions of different channels, so as to fully utilize the advantages of high rate and link budget. According to the performance and distance requirements of the PON system, a proper coding format is selected at the OLT transmitting end, and a proper equalization module is selected at the ONU receiving end, so that the PON system operates at the highest speed and the lowest power meeting the channel requirements.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An adaptive coding and equalization method for a PON system, comprising the steps of:
according to the signal-to-noise ratio and transmission distance of the channel, selecting a corresponding modulation format and a receiving end equalization mode, so that the optimal transmission rate and the lowest power consumption are obtained during data transmission;
the method for obtaining the optimal transmission rate and the lowest power consumption during data transmission by selecting a corresponding modulation format and a receiving end equalization mode according to the signal-to-noise ratio and the transmission distance of a channel comprises the following steps:
the method comprises the steps that a sending end sends a training handshake frame to a receiving end, and configuration options of the training handshake frame can be switched from various configuration schemes comprising different modulation formats and receiving end equalization modes;
the receiving end tests the receiving performance of the training handshake frame under each configuration scheme to determine the configuration scheme capable of obtaining the optimal transmission rate and the lowest power consumption, and feeds back the configuration scheme to the sending end;
and configuring based on the feedback result of the receiving end, so that the sending end and the receiving end work under the selected configuration scheme to perform data transmission.
2. The adaptive coding and equalization method for PON system according to claim 1, wherein: the modulation formats include a CAP16 modulation format, a PAM8 modulation format, and a PAM4 modulation format.
3. The adaptive coding and equalization method for PON system according to claim 2, wherein: the receiving end equalization mode comprises that only a forward feedback equalizer is adopted, and a forward feedback equalizer and a decision feedback equalizer are adopted at the same time, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer are adopted at the same time.
4. The adaptive coding and equalization method for PON system as claimed in claim 3, wherein: the configuration scheme comprises the following steps:
the modulation format selects CAP16 modulation format, and the receiving end equalization mode selects from forward feedback equalizer, forward feedback equalizer and decision feedback equalizer, and forward feedback equalizer, decision feedback equalizer and Volterra equalizer;
the modulation format selects PAM8 modulation format, and the receiving end equalization mode selects from forward feedback equalizer, forward feedback equalizer and decision feedback equalizer, and forward feedback equalizer, decision feedback equalizer and Volterra equalizer; and
the modulation format selects PAM4 modulation format, and the receiving end equalization mode selects from forward feedback equalizer, forward feedback equalizer and decision feedback equalizer, and forward feedback equalizer, decision feedback equalizer and Volterra equalizer.
5. A PON system comprising a transmitting end and a receiving end, the transmitting end and the receiving end configured to: according to the signal-to-noise ratio and transmission distance of the channel, selecting a corresponding modulation format and a receiving end equalization mode, so that the optimal transmission rate and the lowest power consumption are obtained during data transmission;
wherein the transmitting end and the receiving end are configured to: according to the signal-to-noise ratio and transmission distance of the channel, selecting a corresponding modulation format and a receiving end equalization mode to obtain the optimal transmission rate and the lowest power consumption during data transmission, wherein the method specifically comprises the following steps:
the transmitting end transmits a training handshake frame to the receiving end, and configuration options of the training handshake frame can be switched from various configuration schemes comprising different modulation formats and a receiving end equalization mode;
the receiving end tests the receiving performance of the training handshake frame under each configuration scheme to determine the configuration scheme capable of obtaining the optimal transmission rate and the lowest power consumption, and feeds back the configuration scheme to the sending end;
and configuring based on the feedback result of the receiving end, so that the receiving end works under the selected configuration scheme to perform data transmission.
6. The PON system according to claim 5, wherein: the modulation formats adopted by the transmitting end comprise a CAP16 modulation format, a PAM8 modulation format and a PAM4 modulation format.
7. The PON system according to claim 6, wherein: the receiving end equalization mode adopted by the receiving end comprises that only a forward feedback equalizer is adopted, and a forward feedback equalizer and a decision feedback equalizer are adopted at the same time, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer are adopted at the same time.
8. The PON system according to claim 6, wherein: the configuration scheme comprises the following steps:
the modulation format adopted by the transmitting end and the receiving end is CAP16 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer;
the modulation format adopted by the transmitting end and the receiving end is PAM8 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer; and
the modulation format adopted by the transmitting end and the receiving end is PAM4 modulation format, and the receiving end equalization mode of the receiving end is selected from one of a forward feedback equalizer, a forward feedback equalizer and a decision feedback equalizer, and a forward feedback equalizer, a decision feedback equalizer and a Volterra equalizer.
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