CN107710669B

CN107710669B - Data transmission method, transceiving equipment and system

Info

Publication number: CN107710669B
Application number: CN201580081404.0A
Authority: CN
Inventors: 马文凯; 万金; 袁贺; 周素杰; 雍芝奎
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-09-21
Filing date: 2015-09-21
Publication date: 2020-06-02
Anticipated expiration: 2035-09-21
Also published as: CN107710669A; WO2017049443A1

Abstract

A data transmission method, a transceiver device and a system are used for reducing TR phase discrimination noise when the transceiver device is switched from receiving a training sequence to receiving a service sequence. The embodiment of the invention comprises the following steps: the method comprises the steps that first transceiver equipment receives a first training sequence sent by second transceiver equipment, an optimized coding format and optimized power determined by channel estimation according to the first training sequence are sent to the second transceiver equipment, the second training sequence which is modulated by the optimized power and the first coding format known by the first transceiver equipment is received, an AGC coefficient output by an AGC module of the first transceiver equipment converges from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and the modulated second training sequence is demodulated according to the first coding format; and receiving the service sequence modulated by the optimized power and the optimized coding format, wherein the AGC coefficient output by the AGC module is converged from the value corresponding to the second training sequence to the value corresponding to the service sequence.

Description

Data transmission method, transceiving equipment and system

Technical Field

The present invention relates to the field of optical communications, and in particular, to a data transmission method, a transceiver device, and a system.

Background

With the development of the internet, short-distance communication systems applied to metropolitan areas and access networks gradually tend to have large capacity and low cost. An intensity modulation-direct detection (IM-DD) technique based on Discrete Multi-Tone (DMT) is one of the mainstream techniques because of its features of simple structure, high spectrum utilization rate, strong anti-impulse noise capability, low cost, etc.

DMT divides a communication channel into a large number of narrowband subchannels, and allocates a Quadrature Amplitude Modulation (QAM) coding format and power corresponding to each subchannel according to a channel estimation result of the subchannel. DMT technology modulates each subchannel independently, thereby applying limited power to the subchannels that perform relatively better, thereby increasing spectral efficiency.

DMT systems include two states, a channel estimation state and an operational state. The first transceiver device determines the starting time of the channel estimation state and the starting time of the working state in advance, and sends the starting time of the channel estimation state and the starting time of the working state to the second transceiver device, so that the second transceiver device and the first transceiver device simultaneously enter the channel estimation state at the starting time of the channel estimation state and enter the working state at the starting time of the working state.

In the channel estimation state of DMT, the first transceiver device transmits parameters such as QAM coding format and power of each sub-channel to the second transceiver device in advance, and the power value allocated to each sub-channel is usually a non-zero power value. And the second transceiver generates a serial training sequence, distributes the training sequence to all the sub-channels in parallel through serial-parallel conversion, and modulates the training sequence on the sub-channels by using the received QAM coding format and power corresponding to each sub-channel. Then, the training sequences on all the subchannels are converted into time-domain signals through Inverse Fast Fourier Transform (IFFT), and Cyclic Prefixes (CP) and Peak to Average Power Ratio (PAPR) clipping are added, and finally the time-domain signals are sent to the first transceiver through Digital-to-Analog Converter (DAC). And after receiving the training sequence, the first transceiver performs channel estimation on each subchannel, determines an optimized QAM modulation format and optimized power for each subchannel in all subchannels, and sends the optimized QAM modulation format and the optimized power to the second transceiver.

In the DMT operating state, the second transceiver device modulates the received traffic sequence using the optimized QAM modulation format and optimized power for each subchannel, and transmits the modulated traffic sequence to the first transceiver device. The first transceiver device converts the received service sequence into a Digital signal through an Analog-to-Digital Converter (ADC), performs Gain Control on the signal amplitude of the received service sequence through Automatic Gain Control (AGC), synchronizes clock sources of the first transceiver device and the second transceiver device through a TR module, and then sequentially removes a cyclic prefix from the received service sequence, performs Fast Fourier Transform (FFT), channel equalization, QAM decoding, and parallel-serial conversion, thereby recovering the original service sequence.

In the channel estimation state, the power value allocated to each sub-channel is a non-zero power value, and in the operating state, due to the influence of the bandwidth characteristics, the power value is generally concentrated on the sub-channels of the low frequency band, and at this time, the power value on some sub-channels of the high frequency band is zero. In an operating state, when the second transceiver transmits a signal to the first transceiver through the sub-channel of the low frequency band, the total power of the signal is less lost in the transmission process, so that the total power of the signal received by the first transceiver in the operating state is greater than the total power of the signal received in the channel estimation state. That is, when the first transceiver device switches from the channel estimation state to the operating state, the total power of the signal received by the first transceiver device increases, and the amplitude value of the signal also increases.

The first transceiver device includes an AGC module that gain controls the received signal when the signal is received by the first transceiver device to maintain a constant average power output of the signal received by the first transceiver device. Specifically, in the channel estimation state, when the amplitude of the signal received by the first transceiver device is small, the AGC outputs a large AGC coefficient so as to increase the amplitude of the signal, and in the operating state, when the amplitude of the signal received by the first transceiver device is large, the AGC outputs a small AGC coefficient so as to decrease the amplitude of the signal. It can be seen that, when switching from the channel estimation state to the operating state, the AGC coefficient changes from large to small. Fig. 1a is a schematic diagram illustrating the change of the AGC coefficient when the first transceiving equipment switches from the channel estimation state to the operation state. As shown in fig. 1a, an AGC coefficient is changed from a large value to a small value, a convergence Time is required, and in the convergence Time of AGC, because fluctuation of the AGC coefficient is large, a channel estimation result is not matched with an actual channel condition in the convergence Time, so that a bit error rate is high when QAM is decoded, and thus when a first transceiver device performs clock recovery (Time recovery, TR for short) phase detection according to a service sequence after QAM is decoded, noise is increased, as shown in fig. 1b, fig. 1b exemplarily shows a phase detection schematic diagram of TR when the first transceiver device switches from a channel estimation state to a working state.

Disclosure of Invention

Embodiments of the present invention provide a data transmission method, a transceiver device, and a system, which are used to reduce TR phase discrimination noise when the transceiver device switches from receiving a training sequence to receiving a service sequence, thereby reducing the risk of TR collapse.

A first aspect provides a data transmission method, including:

the first transceiver receives a first training sequence sent by the second transceiver, and sends an optimized coding format and optimized power determined by channel estimation according to the first training sequence to the second transceiver;

the first transceiver receives a second training sequence which is sent by the second transceiver and modulated by using the optimized power and a first coding format known by the first transceiver;

the AGC coefficient output by an automatic gain control AGC module of the first transceiver equipment converges from a value corresponding to a first training sequence to a value corresponding to a second training sequence, and the modulated second training sequence is demodulated according to a first coding format;

the first transceiver receives a service sequence which is sent by the second transceiver and modulated by using the optimized power and the optimized coding format;

the AGC coefficient output by the AGC block of the first transceiver device converges from a value corresponding to the second training sequence to a value corresponding to the traffic sequence.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the converging an AGC coefficient output by an AGC module of a first transceiver device from a value corresponding to a first training sequence to a value corresponding to a second training sequence specifically includes:

the AGC coefficient output by the AGC block of the first transceiver device converges from a value corresponding to the first training sequence to the minimum of all values corresponding to the second training sequence.

With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the receiving, by a first transceiver device, a first training sequence sent by a second transceiver device includes:

the first transceiver receives a first training sequence which is transmitted by the second transceiver and modulated by using second power through N sub-channels;

wherein N is an integer greater than or equal to 1; the second power includes power corresponding to each of the N subchannels, and the power corresponding to any subchannel is not zero.

With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, after the first transceiver device receives the first training sequence sent by the second transceiver device, and before the first transceiver device receives the second training sequence, the method further includes:

the first transceiver device carries out channel estimation according to the first training sequence to obtain a channel estimation result;

and the first transceiver device optimizes the coding formats and powers of the N sub-channels according to the channel estimation result, and determines the optimized coding formats and optimized powers of the N sub-channels.

With reference to any one possible implementation manner of the first aspect to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, after the first transceiver device receives the first training sequence and before the first transceiver device receives the second training sequence, the method further includes:

the first transceiver device performs nonlinear equalization on the received first training sequence by using a first nonlinear equalization coefficient; wherein the first nonlinear equalization coefficient is determined according to the first training sequence and the channel estimation result;

the first transceiver device demodulates the modulated second training sequence according to the first coding format, and includes:

the first transceiver device uses a first nonlinear equalization coefficient to perform nonlinear equalization on the received modulated second training sequence;

the first transceiver device performs pre-demodulation operation on the sequence obtained after the nonlinear equalization, and decodes the sequence obtained after the pre-demodulation operation according to the first coding format.

With reference to the fourth possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the first nonlinear equalization coefficient is obtained by:

the first transceiver device multiplies the first training sequence by a channel estimation result to obtain a nonlinear sequence;

the first transceiver device determines a first non-linear equalization coefficient from the non-linear sequence.

A second aspect provides a data transmission method, including:

the second transceiver receives the optimized coding format and the optimized power sent by the first transceiver, wherein the optimized coding format and the optimized power are determined by the first transceiver according to a first training sequence for channel estimation;

the second transceiver determines a second training sequence, modulates the second training sequence by using the optimized power and a first coding format known to the first transceiver, and sends the modulated second training sequence to the first transceiver, wherein the second training sequence is used for enabling an Automatic Gain Control (AGC) module of the first transceiver to converge an output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulates the modulated second training sequence according to the known first coding format;

and the second transceiver receives the service sequence, modulates the service sequence by using the optimized power and the optimized coding format, and sends the modulated service sequence to the first transceiver, wherein the service sequence is used for enabling an AGC module of the first transceiver to converge the output AGC coefficient from a value corresponding to the second training sequence to a value corresponding to the service sequence.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the modulating, by the second transceiver device, the service sequence by using the optimized power and the optimized coding format includes:

the second transceiver device uses the optimized power and the optimized coding format to modulate the received service sequence after the first time;

the time length between the first time and the starting time of the second training sequence after the second transceiver device sends modulation is not less than the convergence time length; the convergence duration is a duration for which the AGC coefficient output by the AGC block of the first transceiver device converges from a value corresponding to the first training sequence to a minimum of all values corresponding to the second training sequence.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, before the receiving, by the second transceiver device, the optimized coding format and the optimized power that are sent by the first transceiver device, the method further includes:

the second transceiver determines a first training sequence, modulates the first training sequence by using second power, and sends the modulated first training sequence to the first transceiver through N sub-channels;

and N is an integer greater than or equal to 1, the second power comprises the power corresponding to each subchannel in the N subchannels, and the power corresponding to any subchannel is not zero.

With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the optimized coding format and the optimized power are obtained by:

A third aspect provides a transceiving apparatus comprising:

a receiving module, configured to receive a first training sequence sent by another transceiver device, a second training sequence sent by the another transceiver device and modulated by using the optimized power and a first coding format known to the transceiver device, and a service sequence sent by the another transceiver device and modulated by using the optimized power and the optimized coding format;

the processing module is used for carrying out channel estimation according to the first training sequence and determining an optimized coding format and optimized power;

the transmitting module is used for transmitting the determined optimized coding format and optimized power to another transceiver device;

the demodulation module is used for demodulating the modulated second training sequence according to the first coding format;

an automatic gain module, AGC, for converging the output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence when the receiving module receives the second training sequence; and when the receiving module receives the service sequence, the output AGC coefficient is converged from the value corresponding to the second training sequence to the value corresponding to the service sequence.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the AGC module is specifically configured to:

when the receiving module receives the second training sequence, the output AGC coefficient is converged from the value corresponding to the first training sequence to the minimum value of all the values corresponding to the second training sequence.

With reference to the third aspect or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the receiving module is specifically configured to:

receiving a first training sequence which is transmitted by another transceiver and modulated by using second power through N sub-channels;

With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the processing module is specifically configured to:

performing channel estimation according to the first training sequence to obtain a channel estimation result;

and optimizing the coding formats and the powers of the N sub-channels according to the channel estimation result, and determining the optimized coding formats and the optimized powers of the N sub-channels.

With reference to any one possible implementation manner of the third aspect to the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the apparatus further includes a nonlinear equalization module, configured to:

when the receiving module receives the first training sequence, the received first training sequence is subjected to nonlinear equalization by using a first nonlinear equalization coefficient; wherein the first nonlinear equalization coefficient is determined according to the first training sequence and the channel estimation result;

when the receiving module receives a second training sequence, the received modulated second training sequence is subjected to nonlinear equalization by using a first nonlinear equalization coefficient;

the demodulation module is specifically configured to:

and performing pre-demodulation operation on the sequence obtained after the nonlinear equalization is performed, and decoding the sequence obtained after the pre-demodulation operation according to the first coding format.

With reference to the fourth possible implementation manner of the third aspect, in a third non-limiting possible implementation manner of the third aspect, the method further includes a nonlinear equalization coefficient calculation module, configured to:

multiplying the first training sequence by a channel estimation result to obtain a nonlinear sequence;

a first non-linear equalization coefficient is determined from the non-linear sequence.

A fourth aspect provides a transceiving apparatus comprising:

the receiving module is used for receiving the optimized coding format and the optimized power which are sent by the other transceiver and the service sequence; wherein the optimized coding format and the optimized power are determined by the other transceiver device according to a first training sequence for channel estimation;

a modulation module, configured to determine a second training sequence, and modulate the second training sequence using the optimized power and a first coding format known to another transceiver device; modulating the service sequence by using the optimized power and the optimized coding format;

the transmitting module is used for transmitting the modulated second training sequence to another transceiver and transmitting the modulated service sequence to another transceiver; the second training sequence is used for enabling an automatic gain control AGC module of another transceiver device to converge the output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulating the modulated second training sequence according to the known first coding format; the traffic sequence is used to cause the AGC module of the other transceiver device to converge the output AGC coefficients from values corresponding to the second training sequence to values corresponding to the traffic sequence.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the modulation module is specifically configured to:

modulating the received service sequence after the first time by using the optimized power and the optimized coding format;

the time length between the first moment and the starting moment of the second training sequence after the modulation sent by the transceiver equipment is not less than the convergence time length; the convergence duration is a duration for which the AGC coefficient output by the AGC block of the other transceiver device converges from a value corresponding to the first training sequence to the minimum of all values corresponding to the second training sequence.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the modulation module is further configured to:

determining a first training sequence, and modulating the first training sequence by using second power;

a sending module, further configured to:

transmitting the modulated first training sequence to another transceiver device through N sub-channels;

With reference to the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the optimized coding format and the optimized power are obtained by:

the other transceiver device carries out channel estimation according to the first training sequence to obtain a channel estimation result;

and the other transceiver device optimizes the coding formats and powers of the N sub-channels according to the channel estimation result, and determines the optimized coding formats and optimized powers of the N sub-channels.

A fifth aspect provides a transceiving apparatus comprising:

the receiver is used for receiving a first training sequence sent by another transceiver device, a second training sequence sent by the other transceiver device and modulated by using the optimized power and a first coding format known by the transceiver device, and a service sequence sent by the other transceiver device and modulated by using the optimized power and the optimized coding format;

the transmitter is used for transmitting the determined optimized coding format and optimized power to another transceiver device;

the processor is used for carrying out channel estimation according to the first training sequence and determining an optimized coding format and optimized power; demodulating the modulated second training sequence according to the first coding format; for converging the output AGC coefficients from a value corresponding to the first training sequence to a value corresponding to the second training sequence when the second training sequence is received by the receiver; when the receiver receives the traffic sequence, the output AGC coefficients are converged from a value corresponding to the second training sequence to a value corresponding to the traffic sequence.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the processor is specifically configured to:

when the receiver receives the second training sequence, the output AGC coefficients are converged from the values corresponding to the first training sequence to the minimum of all the values corresponding to the second training sequence.

With reference to the fifth aspect or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the receiver is specifically configured to:

With reference to the second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the processor is specifically configured to:

With reference to any one possible implementation manner of the third possible implementation manner of the fifth aspect to the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the processor is further configured to:

when a receiver receives a first training sequence, carrying out nonlinear equalization on the received first training sequence by using a first nonlinear equalization coefficient; wherein the first nonlinear equalization coefficient is determined according to the first training sequence and the channel estimation result;

when the receiver receives the second training sequence, the first nonlinear equalization coefficient is used for carrying out nonlinear equalization on the received modulated second training sequence;

With reference to the fourth possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the processor is further configured to:

A sixth aspect provides a transceiving apparatus comprising:

the receiver is used for receiving the optimized coding format and the optimized power which are sent by the other transceiver device and a service sequence; wherein the optimized coding format and the optimized power are determined by the other transceiver device according to a first training sequence for channel estimation;

a processor configured to determine a second training sequence, the second training sequence modulated using the optimized power and a first coding format known to another transceiver device; modulating the service sequence by using the optimized power and the optimized coding format;

the transmitter is used for transmitting the modulated second training sequence to another transceiver and transmitting the modulated service sequence to another transceiver; the second training sequence is used for enabling an automatic gain control AGC module of another transceiver device to converge the output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulating the modulated second training sequence according to the known first coding format; the traffic sequence is used to cause the AGC module of the other transceiver device to converge the output AGC coefficients from values corresponding to the second training sequence to values corresponding to the traffic sequence.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the processor is specifically configured to:

With reference to the sixth aspect or the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the processor is further configured to:

a transmitter, further configured to:

With reference to the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the optimized coding format and the optimized power are obtained by:

A seventh aspect provides a data transmission system, comprising:

the first transceiver is used for receiving a first training sequence sent by the second transceiver and sending an optimized coding format and optimized power determined by channel estimation according to the first training sequence to the second transceiver; receiving a second training sequence which is transmitted by the second transceiver and modulated by the optimized power and a first coding format known by the first transceiver; the AGC coefficient output by the automatic gain control AGC module converges from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and the modulated second training sequence is demodulated according to the first coding format; receiving a service sequence which is transmitted by the second transceiver and modulated by using the optimized power and the optimized coding format; the AGC coefficient output by the AGC module converges from a value corresponding to the second training sequence to a value corresponding to the traffic sequence;

the second transceiver is used for receiving the optimized coding format and the optimized power sent by the first transceiver; determining a second training sequence, modulating the second training sequence by using the optimized power and a first coding format known to the first transceiver device, and sending the modulated second training sequence to the first transceiver device; and the second transceiver receives the service sequence, modulates the service sequence by using the optimized power and the optimized coding format, and sends the modulated service sequence to the first transceiver.

In the embodiment of the invention, first transceiver equipment receives a first training sequence sent by second transceiver equipment, and sends an optimized coding format and optimized power determined by channel estimation according to the first training sequence to the second transceiver equipment; the first transceiver receives a second training sequence which is sent by the second transceiver and modulated by using the optimized power and a first coding format known by the first transceiver; the AGC coefficient output by the AGC module of the first transceiver equipment converges from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and the second training sequence after modulation is demodulated according to the first coding format; the first transceiver receives a service sequence which is sent by the second transceiver and modulated by using the optimized power and the optimized coding format; the AGC coefficient output by the AGC block of the first transceiver device converges from a value corresponding to the second training sequence to a value corresponding to the traffic sequence. Since the first transceiver device receives the second training sequence modulated using the first coding format and the optimized power after performing channel estimation based on the first training sequence, at this time, the AGC coefficients output by the AGC block of the first transceiver device need to converge from a value corresponding to the first training sequence to a value corresponding to the second training sequence, during the convergence of the AGC coefficients, since the first transceiver device may decode the second training sequence using the known first coding format, therefore, the error rate of the first transceiver device decoding the second training sequence is almost zero, therefore, in the process from receiving the first training sequence to receiving the second training sequence, the first transceiver device uses the decoded second training sequence to perform TR phase discrimination, and the noise is low, so that the risk of TR collapse when receiving the second training sequence is reduced. Further, when the first transceiver device receives the service sequence, the AGC coefficient output by the AGC module of the first transceiver device needs to converge from the value corresponding to the second training sequence to the value corresponding to the service sequence, but because both the second training sequence and the service sequence are modulated with optimized power, that is, the value of the AGC coefficient of the AGC module of the first transceiver device corresponding to the second training sequence is close to the value corresponding to the service sequence, and the fluctuation of the AGC coefficient is not large in the process from the reception of the second training sequence to the reception of the service sequence by the first transceiver device, therefore, the error rate is low when the first transceiver device decodes the service sequence, and further, the noise is low when the first transceiver device performs TR phase discrimination for the service sequence, thereby reducing the risk of TR collapse when the second training sequence is received.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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 based on these drawings without inventive exercise.

Fig. 1a is a schematic diagram illustrating the change of AGC coefficients when a first transceiver device switches from a channel estimation state to an operating state in the related art;

fig. 1b is a schematic diagram of phase discrimination of TR when a first transceiver device switches from a channel estimation state to an operating state in the background art;

FIG. 2 is a diagram illustrating a data transmission system architecture according to an embodiment of the present invention;

fig. 3 is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

fig. 3a is a schematic diagram of a pre-measured snr corresponding to a subcarrier in an embodiment of the present invention, and a corresponding relationship between a power load and a bit load;

fig. 4 is a schematic flowchart of a data transmission method according to an embodiment of the present invention;

FIG. 5 is a block diagram of another data transmission system architecture suitable for use in embodiments of the present invention;

fig. 6 is a schematic flow chart of another data transmission method according to an embodiment of the present invention;

FIG. 7 is a block diagram of another data transmission system architecture suitable for use in embodiments of the present invention;

fig. 8 is a schematic flowchart of another data transmission method according to an embodiment of the present invention;

fig. 9 is a schematic flowchart of another data transmission method according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a first transceiver device according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a second transceiver device according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of another first transceiver device according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of another second transceiver device according to an embodiment of the present invention;

fig. 14 is a schematic structural diagram of a data transmission system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The embodiment of the present invention is applicable to various transmission systems, and the embodiment of the present invention is not limited thereto, and for convenience of description, the following embodiment takes the DMT-based IM-DD technology as an example for description. The first transceiver device and the second transceiver device in the embodiment of the invention both have receiving and transmitting functions. Alternatively, the first transceiving device may be a receiver and the second transceiving device may be a transmitter, and there are two communication paths between the transmitter and the receiver, one for the transmitter to transmit information to the receiver, and the other separate communication path between the transmitter and the receiver for the receiver to transmit information to the transmitter.

Fig. 2 is a schematic diagram illustrating a system architecture to which an embodiment of the present invention is applicable. As shown in fig. 2, a second transceiving device 101 and a first transceiving device 102 are included. The second transceiver device 101 comprises at least a second transceiver device negotiation module 110, a training sequence generation module 104, a selection module 106, the second transceiver device 101 further comprising a DAC module. The first transceiving device 102 comprises at least a first transceiving device negotiation module 124, an ADC module 114, an AGC module 115, a TR module 116, a TR phase detection module 120, a channel estimation and compensation module 121, a decoding module 122, and a parallel-to-serial conversion module 125. The first transceiver device 102 may further include a nonlinear equalization module 117 and a nonlinear equalization coefficient calculation module 118.

In DMT, a communication channel is divided into a large number of narrowband subchannels, such as subchannel 1, subchannel 2,. N shown in fig. 2, each of which may be independently modulated according to the coding format and power corresponding to the subchannel.

In the system architecture shown in fig. 2, there is a communication channel between the second transceiving device negotiation module 110 of the second transceiving device 101 and the first transceiving device negotiation module 124 of the first transceiving device, which can be used for the second transceiving device 101 and the first transceiving device 102 to transmit and receive information to and from each other.

The second transceiver device 101 may receive the traffic sequence 103 and may also generate training sequences, such as a first training sequence and a second training sequence, through the training sequence generating module 104. In the second transceiver device 101, the traffic sequence 103 and the training sequence generated by the training sequence generation module 104 are subjected to bit loading and serial-parallel conversion, and then the traffic sequence and the training sequence enter the selection module 106. The selection module 106 selects between the training sequence and the traffic sequence under the control of the second transceiver negotiation module 110, and then outputs the selected sequence. The sequence output by the selection module 106 is loaded into N sub-channels, and each sub-channel encodes the sequence loaded on the sub-channel using the coding format corresponding to the sub-channel, for example, encoding the sequence on sub-channel 1 using coding format 1, encoding the sequence on sub-channel 2 using coding format 2, and encoding the sequence on sub-channel N using coding format N. And load the power corresponding to each subchannel, such as loading power 1 for subchannel 1, loading power 2 for subchannel 2, and loading power N for subchannel N. The second transceiver device 101 performs IFFT on the sequences on the N subchannels, thereby converting the training sequences on all the subchannels into time-domain signals, adds CP and PAPR clipping, and finally sends to the first transceiver device 102 via the DAC. Preferably, the encoding format in the embodiment of the present invention may be a QAM encoding format.

Specifically, the second transceiver 101 sequentially passes the signal output by the DAC through a Transmitter Optical Subassembly (TOSA) 111, an Optical fiber channel 112, and a Receiver Optical Subassembly (ROSA) 113, and then enters the ADC module 114 of the first transceiver 102. When the TOSA111, the optical fiber channel 112, and the ROSA113 are used as a medium for signal transmission, the signal may be affected by the low-pass characteristic and the nonlinear distortion characteristic of the device during transmission.

The ADC block 114 of the first transceiver device converts the received analog signal into a digital signal and performs gain control on the signal amplitude of the received sequence by means of the AGC block 115. Then, the TR module 116 synchronizes clock sources of the first transceiver device 102 and the second transceiver device 101, and then the clock sources are input into the nonlinear equalization module 117 for nonlinear equalization to compensate for nonlinear distortion of the signal during transmission. The sequence output by the nonlinear equalization module 117 sequentially removes the CP, and after FFT, is input to the channel estimation and channel compensation module 121 for channel equalization, channel estimation, and channel compensation. The sequence output by the channel estimation and channel compensation module 121 sequentially enters the decoding module 122 and the parallel-to-serial conversion module 125, and is sequentially decoded and parallel-to-serial converted, and then the first transceiver device 102 outputs the sequence restored by the first transceiver device 102, for example, if the sequence sent by the second transceiver device 101 is a service sequence, the first transceiver device 102 outputs the service sequence, and if the sequence sent by the second transceiver device 101 is a training sequence, the first transceiver device 102 outputs the training sequence.

In the signal processing process of the first transceiver device 102, the TR module 116 needs to receive a signal input by the TR phase detection module 120, and the TR phase detection module 120 needs to receive a sequence after CP and FFT are sequentially removed and a decoded sequence, and perform TR phase detection according to the sequence after CP and FFT are sequentially removed and the decoded sequence. The non-linear equalization module 117 needs to perform non-linear equalization according to the non-linear equalization coefficient input by the non-linear equalization coefficient calculation module 118.

In the embodiment of the present invention, in the channel estimation state, the first transceiver device 102 may further generate a first training sequence through the training sequence generating module 104, and send the first training sequence to the first transceiver device 102, and the first transceiver device 102 performs channel estimation according to the first training sequence to obtain a channel estimation result. The channel estimation result, the sequence output by the channel estimation and channel compensation module 121, and the DMT subcarrier power/constellation allocation algorithm are combined to optimize currently allocated parameters, such as coding format, power, and the like, of each subchannel in all subchannels, and determine an optimized coding format and optimized power, so that limited power is applied to subchannels with relatively better performance, and the spectrum utilization rate is improved.

After the first transceiver device determines the optimized coding format and the optimized power, the first transceiver device may negotiate the module 124 to send to the second transceiver device negotiation module 110 of the second transceiver device, so that the second transceiver device 101 may modulate the received service sequence 103 using the optimized coding format and the optimized power.

Fig. 3 schematically shows a flow chart of a data transmission method provided by an embodiment of the present invention.

Based on the above, as shown in fig. 3, an embodiment of the present invention provides a data transmission method, including:

step 301, a first transceiver device receives a first training sequence sent by a second transceiver device, and sends an optimized coding format and optimized power determined by channel estimation according to the first training sequence to the second transceiver device;

step 302, the first transceiver device receives a second training sequence which is sent by the second transceiver device and modulated by the optimized power and a first coding format known to the first transceiver device;

step 303, converging an AGC coefficient output by an AGC module of the first transceiver device from a value corresponding to the first midamble to a value corresponding to the second midamble, and demodulating the modulated second midamble according to the first coding format;

step 304, the first transceiver device receives a service sequence which is sent by the second transceiver device and modulated by using the optimized power and the optimized coding format;

the AGC coefficient output by the AGC block of the first transceiver device converges from a value corresponding to the second training sequence to a value corresponding to the traffic sequence, step 305.

In the embodiment of the invention, three states, namely a channel estimation state, a channel estimation water filling state and a working state, are defined for a first transceiver and a second transceiver, the starting time of the channel estimation state is defined as a second time, the starting time of the channel estimation water filling state is defined as a third time, and the starting time of the working state is defined as a first time. The second transceiver device and the first transceiver device may determine the first time, the second time, and the third time in various manners, for example, a manner negotiated in advance between the second transceiver device and the first transceiver device, a manner uniformly notified by a higher-level server through network signaling, a manner determined by the first transceiver device and transmitted to the second transceiver device, a manner determined by the second transceiver device and transmitted to the first transceiver device, or a manner configured manually, etc. In an alternative embodiment, the time when the system is powered on is determined as the second time, and after the system is powered on, the second transceiver and the first transceiver automatically enter the channel estimation state.

Optionally, in an embodiment, the second transceiver device determines a first training sequence, modulates the first training sequence with a second power, and sends the modulated first training sequence to the first transceiver device through N sub-channels, where N is an integer greater than or equal to 1, the second power includes a power corresponding to each sub-channel in the N sub-channels, and the power corresponding to any sub-channel is not zero. Optionally, the second transceiver device modulates the first training sequence using a second power and a second coding format.

An optional implementation manner is that, since information is transmitted between the second transceiver negotiation module of the second transceiver and the first transceiver negotiation module of the first transceiver through independent communication channels, the second transceiver and the first transceiver may negotiate with the first transceiver through the second transceiver negotiation module, and determine the generation rule of the first training sequence, the second coding format, and the second power in a negotiation manner. And the training sequence generating module of the second transceiver generates a first training sequence according to a generating rule of the first training sequence negotiated with the first transceiver in advance under the control of the negotiation module of the second transceiver.

After the second transceiver device determines the first training sequence, the first training sequence is modulated using a second coding format and a second power negotiated with the first transceiver device. The second coding format is a coding format corresponding to each subchannel in the N subchannels, and the second power is a power corresponding to each subchannel in the N subchannels. In the channel estimation state, in order to enable the first transceiver device to perform channel estimation on each sub-channel, it is preferable that the power corresponding to any sub-channel included in the second power is not zero.

The first transceiver device entering the channel estimation state receives a first training sequence which is sent by the second transceiver device and modulated by using second power through N sub-channels, and then the first transceiver device carries out channel estimation according to the first training sequence to obtain a channel estimation result; and the first transceiver device optimizes the coding formats and powers of the N sub-channels according to the channel estimation result, and determines the optimized coding formats and optimized powers of the N sub-channels. And sending the optimized coding format and the optimized power to the first transceiver device so as to achieve the purpose of optimizing the coding format and the power of each subchannel, thereby applying the limited power to the subchannels with relatively better performance and improving the spectrum utilization rate. The optimized coding format comprises a coding format corresponding to each subchannel, and the optimized power comprises power corresponding to each subchannel.

Specifically, after performing Channel estimation according to the first training sequence, the first transceiver device obtains a Channel estimation result, such as Signal to Noise Ratio (SNR) of all sub-channels or Channel State Information measurement Reference Signal (CSI-RS) of all sub-channels. And determining the condition of each subchannel by combining the channel estimation result, the sequence output by the channel estimation and channel compensation module and a DMT subcarrier power/constellation allocation algorithm, optimizing parameters such as coding format, power and the like currently allocated to each subchannel in all subchannels, and determining the optimized coding format and optimized power, so that the limited power is applied to the subchannels with relatively better performance, and the spectrum utilization rate is improved.

Taking fig. 3a as an example, the detailed description will be made. Fig. 3a illustrates the correspondence between the pre-measured SNR, i.e. the SNR obtained by channel estimation, and the power load and the bit load corresponding to the subcarriers. As shown in fig. 3a, when the pre-measured SNR of a subcarrier is high, the power load corresponding to the subcarrier is large, and the corresponding bit load is also large. Conversely, when the pre-measured SNR of a subcarrier is low, the power load corresponding to the subcarrier is small, and the bit load corresponding to the subcarrier is also small. That is, when the SNR of a sub-carrier on a certain sub-channel is high, the power correspondingly allocated on the sub-channel should be large, and conversely, when the SNR of a sub-carrier on a certain sub-channel is low, the power correspondingly allocated on the sub-channel should be small. And combining the channel estimation result, the limited power is applied to the sub-channel with relatively better performance, and the frequency spectrum utilization rate is improved.

In an optional implementation manner, in the channel estimation state, the second transceiver device sends the first training sequence, the first transceiver device performs channel estimation according to the first training sequence, obtains an optimized coding format and optimized power, and sends the optimized coding format and the optimized power to the first transceiver device, the first transceiver device further determines a third time, the third time is an initial time of the channel estimation water filling state, and the first transceiver device sends information of the third time to the second transceiver device, so that the second transceiver device and the first transceiver device enter the channel estimation water filling state at the third time. Preferably, the first transceiver device further determines the first code format and transmits the first code format to the first transceiver device. The optional implementation manner is that the first transceiver device sends information used for indicating the third time, the first coding format, the optimized coding format and the optimized power in one piece of information to the second transceiver device, or the first transceiver device sends the information used for indicating the third time, the first coding format, the optimized coding format and the optimized power to the second transceiver device through multiple pieces of information, respectively, and specifically, the first transceiver device sends the information used for indicating the third time, the first coding format, the optimized power and other information to the second transceiver device through a communication channel between the first transceiver device negotiation module and the second transceiver device negotiation module.

In a specific implementation, the third time is necessarily located after the time when the second transceiver device receives the optimized coding format and the optimized power sent by the first transceiver device. And at a third moment, the second transceiver and the first transceiver enter a channel estimation water filling state simultaneously, and at this moment, the second transceiver can generate a second training sequence according to an algorithm generated by a training sequence negotiated with the first transceiver in advance, and modulate the second training sequence by using the optimized power and the first coding format known by the first transceiver. Optionally, the second training sequence may be the same as or different from the first training sequence, which is not limited in this embodiment of the present invention. The first coding format known to the first transceiver device may specifically include multiple forms, for example, the first transceiver device determines the first coding format and sends the first coding format to the second transceiver device, where the first coding format is known to the first transceiver device; or, the first transceiver device and the second transceiver device determine the first encoding format through a negotiation mode, and the first encoding format is known to the first transceiver device; or, sending information of the first coding format to the second transceiver and the first transceiver through a high-level signaling, so that the first transceiver acquires the first coding format; or configuring the first encoding format in both the first transceiver device and the second transceiver device in a manual configuration manner, so that the first transceiver device obtains the first encoding format.

In the channel estimation water filling stage, the first transceiver receives a second training sequence which is sent by the second transceiver and modulated by using the optimized power and a first coding format known by the first transceiver, and demodulates the modulated second training sequence according to the first coding format.

As explained in conjunction with fig. 2, after the first transceiver device receives the first training sequence through the ADC module 114, the AGC module 115 of the first transceiver device performs gain control on the signal amplitude of the received first training sequence, and the AGC module of the first transceiver device outputs an AGC coefficient corresponding to the first training sequence. After the first transceiver device receives the second training sequence through the ADC module 114, the AGC module 115 of the first transceiver device performs gain control on the signal amplitude of the received second training sequence and outputs an AGC coefficient corresponding to the second training sequence. When the first transceiver device receives the first training sequence, the power used for the modulation of the first training sequence is tiled, that is, the power corresponding to any subchannel is non-zero power. At this time, the power loss of the first training sequence during transmission is large, so that the power of the first training sequence received by the first transceiver device is small, and at this time, the AGC coefficient corresponding to the first training sequence that needs to be output by the AGC module 115 is large. In the channel estimation water filling state, the second transceiver uses the optimized power to modulate the second training sequence, and after the first transceiver receives the first training sequence and performs channel estimation, the specific distribution situation of the optimized power determined according to the condition of each subchannel is that most of the power is distributed in the low frequency band, and the power value on some subchannels in the high frequency band is zero at this time. If the loss of the second training sequence is small during the transmission process, the amplitude of the signal of the second training sequence received by the first transceiver device is large, and at this time, the AGC coefficient corresponding to the second training sequence that needs to be output by the AGC module 115 is small. At this time, the first transceiver device switches from the channel estimation state to the channel estimation water filling state, and when the first transceiver device receives the first training sequence to the second training sequence, the AGC coefficient output by the AGC module of the first transceiver device decreases from a larger value corresponding to the first training sequence, and converges to a value corresponding to the second training sequence. The AGC module 115 of the first transceiver device transmits the sequence after gain control to the TR module 116, and then performs demodulation operation on the second training sequence and outputs the second training sequence.

In a preferred embodiment, after the channel estimation water filling state, the second transceiver and the first transceiver enter an operating state at the same time at a first time, and in the operating state, the second transceiver starts processing the received traffic sequence. The traffic sequence is a sequence of normal operating states received by the second transceiving equipment. In a preferred embodiment, the second transceiver device modulates the service sequence received after the first time by using the optimized power and the optimized coding format; the time length between the first time and the starting time of the second training sequence after the second transceiver device transmits the modulation is not less than the convergence time length; the convergence duration is a duration in which the AGC coefficient output by the AGC module of the first transceiver device converges from a value corresponding to the first training sequence to a minimum value among all values corresponding to the second training sequence. That is, the first transceiver device receives the second training sequence until the AGC coefficient output by the AGC module of the first transceiver device converges from the value corresponding to the first training sequence to the minimum of all values corresponding to the second training sequence.

Referring to fig. 2 for description, in the channel estimation water-filling state, the receiving, by the first transceiver device, the second training sequence, and the demodulating operation performed on the second training sequence specifically includes:

the sequence output by the TR module 116 is input to the non-linear equalization module 117 for non-linear equalization, and then the sequence obtained after the non-linear equalization is subjected to a pre-demodulation operation, and the sequence obtained after the pre-demodulation operation is input to the decoding module 122 for the decoding module 122 to perform a corresponding operation. The pre-demodulation operation may include, among other things, removing CP and FFT from the sequence output by the non-linear equalization module 117, followed by channel equalization, channel estimation, and channel compensation.

The first transceiver device inputs the second training sequence subjected to the demodulation operation to the parallel-to-serial conversion module 125 for parallel-to-serial conversion, and outputs the parallel-to-serial converted second training sequence.

Another alternative is that the signal after the AGC module 115 of the first transceiver device performs gain control is sent to the TR module 116, and then the second training sequence is not subjected to nonlinear equalization by the nonlinear equalization module 117, but directly performs pre-demodulation on the sequence output by the TR module 116. The first transceiver device inputs the second training sequence subjected to the pre-demodulation operation to the parallel-to-serial conversion module 125 for parallel-to-serial conversion, and outputs the parallel-to-serial converted second training sequence.

The first transceiver device decodes the second training sequence by using the known first coding format, at this time, in the channel estimation water injection state, the error rate of the first transceiver device decoding is almost zero, and at this time, when the TR phase discrimination module 120 of the first transceiver device performs TR phase discrimination according to the second training sequence which is decoded correctly, the noise is small, and the possibility of collapse is greatly reduced.

And after the second transceiver enters the working state, the second transceiver receives the service sequence, modulates the service sequence by using the optimized power and the optimized coding format, and sends the modulated service sequence to the first transceiver. The AGC module of the first transceiver outputs an AGC coefficient to carry out gain control on the signal amplitude of the received service sequence, and the second training sequence is modulated by using the optimized power, and the service sequence is also modulated by the optimized power, so that the first transceiver switches from a channel estimation water injection state to a working state, and the AGC coefficient corresponding to the second training sequence output by the AGC module of the first transceiver has little difference with the AGC coefficient corresponding to the service sequence. That is to say, after the first transceiver device switches from the channel estimation water filling state to the operating state, the AGC coefficient output by the AGC module of the first transceiver device does not fluctuate much, so that when the first transceiver device decodes a service sequence, the accuracy is high, and when TR phase detection is further performed according to the decoded service sequence, the phase detection noise is small, and the possibility of TR collapse is also small.

For example, when the first transceiver device receives the first training sequence, the power used for the modulation of the first training sequence is tiled, that is, the power corresponding to any sub-channel is non-zero power, so that the power loss of the first training sequence in the transmission process is large, so that the power of the first training sequence received by the first transceiver device is small, when the total power of all sub-channels is 10, the power of the first training sequence received by the receiving end is 2, at this time, the AGC coefficient required to be output by the AGC module of the first transceiver device is 2.5, at this time, after the AGC module of the first training sequence performs gain control, the power of the output sequence is 2.5 times 2, that is 5.

When the first transceiver device receives the second training sequence, because the second training sequence is modulated by using the optimized power, further because the specific distribution situation of the optimized power is that most of the power is distributed in the low frequency band, and at this time, the power value on some sub-channels of the high frequency band is zero, so that the loss of the second training sequence in the transmission process is small, the power of the second training sequence received by the first transceiver device is large, at this time, the power of the second training sequence received by the first transceiver device is 8, at this time, the AGC coefficient required to be output by the AGC module of the first transceiver device is 0.625, so that after the second training sequence is gain-controlled by the AGC module, the power of the output sequence is 0.625 multiplied by 8, which is 5. It can be seen that when the second midamble is received, the AGC coefficients need to converge from 2.5 to 0.625, where after the second midamble is received, all the AGC coefficients output by the AGC module are the AGC coefficients corresponding to the second midamble, i.e. all the AGC coefficients output by the AGC module corresponding to the second midamble from 2.5 to 0.625, and 0.625 is the minimum value among the values of the AGC coefficients corresponding to the second midamble. The first time is a time at which or after the AGC coefficient converges to 0.625. The convergence time period, i.e. the time period between the first and third instants, may typically use an empirical value, such as a few milliseconds.

When a service sequence is received, the AGC module of the first transceiver outputs an AGC coefficient to perform gain control on the received service sequence, and because the second training sequence is modulated by using optimized power and the service sequence is also modulated by the optimized power, the first transceiver switches from a channel estimation water injection state to a working state, and the AGC coefficient corresponding to the second training sequence output by the AGC module of the first transceiver has a small difference with the AGC coefficient corresponding to the service sequence. The power of the service sequence received by the first transceiver device is 8, at this time, the AGC coefficient that needs to be output by the AGC module of the first transceiver device is 0.625, and thus, after the gain control is performed on the service sequence by the AGC module, the power of the output sequence is 0.625 multiplied by 8, which is 5. It can be seen that, from the time when the first transceiver receives the second training sequence to the time when the first transceiver receives the service sequence, the AGC coefficient output by the AGC module does not fluctuate much.

Through the process, the second transceiver and the first transceiver are switched from the channel estimation state to the channel estimation water filling state and then switched from the channel estimation water filling state to the working state, and the decoding accuracy of the first transceiver is high in the whole process, so that phase discrimination noise is low and the possibility of TR collapse is low when the first transceiver performs TR phase discrimination.

To more clearly introduce the above method flow, an embodiment of the present invention provides a flow diagram of another data transmission method, as shown in fig. 4:

step 401, the communication channel between the second transceiver negotiation module and the first transceiver negotiation module is successfully established, and then step 402 is executed;

step 402, the second transceiver negotiation module and the first transceiver negotiation module determine a second moment, a first moment and a first training sequence generation rule through negotiation, and then execute step 403;

step 403, the first transceiver device requests the second transceiver device to transmit the first training sequence, and transmits the second coding format and the second power; specifically, the first transceiver device may send an indication message for instructing the second transceiver device to send the first training sequence, and then step 404 is executed;

step 404, after the second transceiver device receives indication information sent by the first transceiver device and used for indicating the second transceiver device to send the first training sequence, the second transceiver device generates the first training sequence and obtains a second coding format and a second power, and then step 405 is executed;

step 405, the second transceiver enters a channel estimation state at a second time, modulates the first training sequence by using a second coding format and a second power, sends the modulated first sequence to the first transceiver, and then executes step 406;

step 406, the first transceiver device receives the first training sequence, and then step 407 is executed;

step 407, the first transceiver device performs channel estimation according to the first training sequence, and then performs step 408;

step 408, the first transceiver device determines the optimized coding format and the optimized power by combining the DMT subcarrier power/constellation allocation algorithm and the channel estimation result, and then performs step 409;

step 409, the first transceiver sends the optimized coding format and the optimized power to the second transceiver; and sends the first encoding format to the second transceiver device, and the third time, then executes step 410;

step 410, the second transceiver device obtains the optimized encoding format, the optimized power, the first encoding format, and the third time, and then step 411 is executed;

step 411, the second transceiver enters a channel estimation water injection state at the third time, modulates the second training with the first coding format and the optimized power, and sends the modulated second training sequence to the first transceiver, and then executes step 412;

step 412, the first transceiver device enters a channel estimation water injection state at a third time, receives and processes the second training sequence, outputs the second training sequence processed by the first transceiver device, and then executes step 413;

step 413, the second transceiver enters a working state at the first time, modulates the received service sequence by using the optimized coding format and the optimized power, and sends the modulated service sequence to the first transceiver, and then executes step 414;

and 414, receiving the service sequence which enters the working state at the first moment, and the first transceiver device receives and processes the service sequence and outputs the service sequence processed by the first transceiver device.

Based on the above, the embodiments of the present invention provide a preferred implementation. Fig. 5 is a schematic diagram illustrating another system architecture to which an embodiment of the present invention is applicable, and as shown in fig. 5, a nonlinear sequence generation module 501 is added to the system architecture shown in fig. 2, and the nonlinear sequence generation module 501 is connected to the channel estimation and channel compensation module 121 and the nonlinear equalization coefficient calculation module 118.

Based on the system architecture shown in fig. 5, a preferred implementation manner provided in the embodiment of the present invention is that, in the channel estimation state, when the first transceiver device receives the first training sequence, the first transceiver device performs nonlinear equalization on the received first training sequence by using the first nonlinear equalization coefficient. The first nonlinear equalization coefficient is determined according to the first training sequence and a channel estimation result, and the channel estimation result is a result of channel estimation according to the first training sequence. Preferably, the first non-linear equalization coefficient is obtained by: the first transceiver device multiplies the first training sequence by a channel estimation result on a frequency domain, then converts the obtained structure to a time domain through IFFT, and adds a CP to obtain a nonlinear sequence; the first transceiver device determines a first non-linear equalization coefficient from the non-linear sequence. The channel estimation result may be some parameter determined by the first transceiver device that can reflect the conditions of all the subchannels, such as the SNR of each subchannel.

And in the channel estimation water filling state, when the first transceiver receives the second training sequence, the first nonlinear equalization coefficient is used for carrying out nonlinear equalization on the received modulated second training sequence. And the first transceiver device performs pre-demodulation operation on the sequence obtained after the nonlinear equalization, and decodes the sequence obtained after the pre-demodulation operation according to the first coding format.

Based on the system architecture shown in fig. 5, fig. 6 exemplarily shows a flow chart of a preferred data transmission method provided by the embodiment of the present invention, as shown in fig. 6:

step 402, the second transceiver negotiation module negotiates with the first transceiver negotiation module about a second time, a first time and a first training sequence generation rule, and then step 403 is executed;

step 404, the second transceiver device generates a first training sequence, and obtains a second coding format and a second power, and then step 405 is executed;

step 407, the first transceiver device performs channel estimation according to the first training sequence, and then performs step 601;

601, generating a nonlinear sequence by a first transceiver according to a first training sequence and a channel estimation result; determining a first nonlinear equalization coefficient according to the nonlinear sequence, and then executing step 602;

step 602, performing nonlinear equalization on the received first training sequence by using a first nonlinear equalization coefficient, performing pre-demodulation operation on the sequence obtained after the nonlinear equalization, decoding the sequence obtained after the pre-demodulation operation according to a second coding format, and then executing step 408;

step 411, the second transceiver enters a channel estimation water-filling state at the third time, modulates the second training with the first coding format and the optimized power, and sends the modulated second training sequence to the first transceiver, then step 603 is executed, and then step 603 is executed;

step 603, entering a channel estimation water injection state at a third moment, receiving the second training sequence by the first transceiver device, performing nonlinear equalization on the received second training sequence by using the first nonlinear equalization coefficient, performing pre-demodulation operation on the sequence obtained after the nonlinear equalization, decoding the sequence obtained after the pre-demodulation operation according to a second coding format, and then executing step 604;

step 604, the first transceiver device processes the second training sequence after the nonlinear equalization, and outputs the second training sequence processed by the first transceiver device; then step 413 is performed;

Since the AGC coefficient output by the AGC module of the first transceiver device converges from a value corresponding to the first training sequence to a value corresponding to the second training sequence when the second transceiver device and the first transceiver device switch from the channel estimation state to the channel estimation water filling state, further, since the amplitude of the signal corresponding to the first training sequence received by the first transceiver device is small and the amplitude of the signal corresponding to the second training sequence is large, the AGC coefficient needs to converge from a large value to a small value. At this time, in the channel estimation state, the first transceiver device generates a nonlinear sequence according to the channel estimation state and the first training sequence, and determines a first nonlinear equalization coefficient according to the nonlinear sequence; therefore, the first non-linear equalization coefficient already reflects the actual condition of the channel, so that the first transceiver device can perform non-linear equalization on the received second training sequence by directly using the first non-linear equalization coefficient in the channel estimation water filling state, and because the AGC coefficient fluctuation is large in the AGC convergence process when the channel estimation state is switched to the working state, therefore, a new nonlinear equalization coefficient generated according to the second training sequence at this time is not matched with an actual channel condition, and errors are prone to occur.

In an optional implementation manner, when the second transceiver and the first transceiver are switched to the operating state at the same time, the first transceiver continues to calculate a nonlinear equalization coefficient corresponding to a current service sequence according to the service sequence received in real time, performs nonlinear equalization using the nonlinear equalization coefficient corresponding to the current service sequence, performs a series of processing on a sequence obtained after the nonlinear equalization, and outputs a service sequence recovered by the first transceiver.

Based on the above, the embodiments of the present invention provide another preferred implementation. Fig. 7 is a schematic diagram of another system architecture suitable for use in the embodiment of the present invention, and as shown in fig. 7, based on the system architecture shown in fig. 2, the system architecture shown in fig. 7 omits the nonlinear equalization module 117 and the nonlinear equalization coefficient calculation module 118.

Based on the system architecture shown in fig. 7, a preferred implementation manner provided in the embodiment of the present invention is that, in the channel estimation state, during the whole process in which the first transceiver device receives and decodes the first training sequence and finally outputs the first training sequence recovered by the first transceiver device, the first transceiver device does not perform nonlinear equalization on the first training sequence. And in the whole process that the first transceiver receives and decodes the second training sequence and finally outputs the second training sequence recovered by the first transceiver in the water injection state of channel estimation, the first transceiver does not perform nonlinear equalization on the second training sequence. Optionally, in the working state, the first transceiver device does not perform nonlinear equalization on the service sequence in the whole process that the first transceiver device receives and decodes the service sequence and finally outputs the service sequence recovered by the first transceiver device. Therefore, the problem that the nonlinear coefficient calculated by the first transceiver is easy to make errors under the condition that the AGC coefficient has large fluctuation when the first transceiver is switched from the channel estimation state to the channel estimation water filling state can be avoided,

based on the system architecture shown in fig. 7, an embodiment of the present invention provides a flowchart of a preferred data transmission method, as shown in fig. 8:

step 406, the first transceiver device receives the first training sequence, and then step 801 is executed;

step 801, a first transceiver device performs channel estimation according to a first training sequence and outputs the first training sequence processed by the first transceiver device, and in the process, the first transceiver device does not perform nonlinear equalization on the first training sequence; then step 408 is performed;

step 411, the second transceiver enters a channel estimation water injection state at the third time, modulates the second training with the first coding format and the optimized power, and sends the modulated second training sequence to the first transceiver; then step 802 is executed;

step 802, entering a channel estimation water injection state at a third moment, receiving and processing the second training sequence by the first transceiver device, and outputting the second training sequence processed by the first transceiver device, wherein the first transceiver device does not perform nonlinear equalization on the second training sequence in the process; then step 413 is performed;

From the above, it can be seen that: in the embodiment of the invention, first transceiver equipment receives a first training sequence sent by second transceiver equipment, and sends an optimized coding format and optimized power determined by channel estimation according to the first training sequence to the second transceiver equipment; the first transceiver receives a second training sequence which is sent by the second transceiver and modulated by using the optimized power and a first coding format known by the first transceiver; the AGC coefficient output by the AGC module of the first transceiver equipment converges from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and the second training sequence after modulation is demodulated according to the first coding format; the first transceiver receives a service sequence which is sent by the second transceiver and modulated by using the optimized power and the optimized coding format; the AGC coefficient output by the AGC block of the first transceiver device converges from a value corresponding to the second training sequence to a value corresponding to the traffic sequence. Since the first transceiver device receives the second training sequence modulated using the first coding format and the optimized power after performing channel estimation based on the first training sequence, at this time, the AGC coefficients output by the AGC block of the first transceiver device need to converge from a value corresponding to the first training sequence to a value corresponding to the second training sequence, during the convergence of the AGC coefficients, since the first transceiver device may decode the second training sequence using the known first coding format, therefore, the error rate of the first transceiver device decoding the second training sequence is almost zero, therefore, in the process from receiving the first training sequence to receiving the second training sequence, the first transceiver device uses the decoded second training sequence to perform TR phase discrimination, and the noise is low, so that the risk of TR collapse when receiving the second training sequence is reduced. Further, when the first transceiver device receives the service sequence, the AGC coefficient output by the AGC module of the first transceiver device needs to converge from the value corresponding to the second training sequence to the value corresponding to the service sequence, but because both the second training sequence and the service sequence are modulated with optimized power, that is, the value of the AGC coefficient of the AGC module of the first transceiver device corresponding to the second training sequence is close to the value corresponding to the service sequence, and the fluctuation of the AGC coefficient is not large in the process from the reception of the second training sequence to the reception of the service sequence by the first transceiver device, therefore, the error rate is low when the first transceiver device decodes the service sequence, and further, the noise is low when the first transceiver device performs TR phase discrimination for the service sequence, thereby reducing the risk of TR collapse when the second training sequence is received.

Fig. 9 is a schematic flowchart illustrating a data transmission method according to an embodiment of the present invention.

Based on the same concept, the present invention provides a data transmission method, as shown in fig. 9, including:

step 901, a second transceiver device receives an optimized coding format and optimized power sent by a first transceiver device, wherein the optimized coding format and the optimized power are determined by the first transceiver device according to a first training sequence for channel estimation;

step 902, the second transceiver determines a second training sequence, modulates the second training sequence using the optimized power and the known first coding format of the first transceiver, and sends the modulated second training sequence to the first transceiver, where the second training sequence is used to make the AGC module of the first transceiver converge the output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulates the modulated second training sequence according to the known first coding format;

and step 903, the second transceiver receives the service sequence, modulates the service sequence by using the optimized power and the optimized coding format, and sends the modulated service sequence to the first transceiver, wherein the service sequence is used for enabling an AGC module of the first transceiver to converge the output AGC coefficient from a value corresponding to the second training sequence to a value corresponding to the service sequence.

Preferably, the modulating, by the second transceiver device, the service sequence by using the optimized power and the optimized coding format includes:

the time length between the first time and the starting time of the second training sequence after the second transceiver device transmits the modulation is not less than the convergence time length; the convergence duration is a duration in which the AGC coefficient output by the AGC module of the first transceiver device converges from a value corresponding to the first training sequence to a minimum value among all values corresponding to the second training sequence.

Preferably, before the second transceiver device receives the optimized coding format and the optimized power sent by the first transceiver device, the method further includes:

the second transceiver determines the first training sequence, modulates the first training sequence by using second power, and sends the modulated first training sequence to the first transceiver through N subchannels;

wherein N is an integer greater than or equal to 1, the second power includes power corresponding to each of the N subchannels, and the power corresponding to any subchannel is not zero.

Preferably, the optimized coding format and the optimized power are obtained by:

and the first transceiver device optimizes the coding formats and the powers of the N subchannels according to the channel estimation result, and determines the optimized coding formats and the optimized powers of the N subchannels.

Fig. 10 illustrates a schematic structural diagram of a first transceiver device according to an embodiment of the present invention.

Based on the same conception, the embodiment of the present invention provides a first transceiver device, as shown in fig. 10, including a receiving module 1001, a processing module 1002, a transmitting module 1003, a demodulating module 1004, an AGC module 1005, a nonlinear equalization module 1006, and a nonlinear equalization coefficient calculating module 1007:

a receiving module 1001, configured to receive a first training sequence sent by a second transceiver, a second training sequence sent by the second transceiver and modulated by using the optimized power and a first coding format known to the first transceiver, and a service sequence sent by the second transceiver and modulated by using the optimized power and the optimized coding format;

a processing module 1002, configured to perform channel estimation according to the first training sequence, and determine an optimized coding format and an optimized power;

a sending module 1003, configured to send the determined optimized coding format and optimized power to the second transceiver device;

a demodulation module 1004, configured to perform demodulation operation on the modulated second training sequence according to the first coding format;

an AGC module 1005, configured to converge the output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence when the receiving module receives the second training sequence; and when the receiving module receives the service sequence, the output AGC coefficient is converged from the value corresponding to the second training sequence to the value corresponding to the service sequence.

Preferably, the AGC module 1005 is specifically configured to:

Preferably, the receiving module 1001 is specifically configured to:

receiving a first training sequence which is transmitted by second transceiver equipment and modulated by using second power through N sub-channels;

Preferably, the processing module 1002 is specifically configured to:

Preferably, a non-linear equalization module 1006 is further included for:

the demodulation module 1004 is specifically configured to:

Preferably, the apparatus further includes a nonlinear equalization coefficient calculating module 1007 configured to:

Fig. 11 is a schematic structural diagram illustrating a second transceiver device according to an embodiment of the present invention.

Based on the same conception, the embodiment of the present invention provides a second transceiver device, as shown in fig. 11, including a receiving module 1101, a modulating module 1102, and a sending module 1103:

a receiving module 1101, configured to receive the optimized coding format and the optimized power sent by the first transceiver device, and a service sequence; the optimized coding format and the optimized power are determined by the first transceiver device according to a first training sequence for channel estimation;

a modulation module 1102, configured to determine a second training sequence, and modulate the second training sequence using the optimized power and a first coding format known to the first transceiver device; modulating the service sequence by using the optimized power and the optimized coding format;

a sending module 1103, configured to send the modulated second training sequence to the first transceiver device, and send the modulated service sequence to the first transceiver device; the second training sequence is used for enabling an Automatic Gain Control (AGC) module of the first transceiver to converge the output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulating the modulated second training sequence according to the known first coding format; the traffic sequence is used to cause the AGC module of the first transceiver device to converge the output AGC coefficients from values corresponding to the second training sequence to values corresponding to the traffic sequence.

Preferably, the modulation module 1102 is specifically configured to:

Preferably, the modulation module 1102 is further configured to:

sending module 1103 is further configured to:

sending the modulated first training sequence to first transceiver equipment through N sub-channels;

Fig. 12 is a schematic structural diagram illustrating another first transceiver device according to an embodiment of the present invention.

Based on the same concept, the embodiment of the present invention provides a first transceiver device, as shown in fig. 12, including a receiver 1201, a processor 1202, and a transmitter 1206:

a receiver 1201, configured to receive, under the control of the processor 1202, a first training sequence sent by the second transceiver device, a second training sequence sent by the second transceiver device and modulated by using the optimized power and a first coding format known to the first transceiver device, and a service sequence sent by the second transceiver device and modulated by using the optimized power and the optimized coding format;

a transmitter 1206, configured to send the determined optimized coding format and optimized power to a second transceiver device under the control of the processor 1202;

a processor 1202, configured to perform channel estimation according to the first training sequence, and determine an optimized coding format and an optimized power; demodulating the modulated second training sequence according to the first coding format; for converging the output AGC coefficients from a value corresponding to the first training sequence to a value corresponding to the second training sequence when the second training sequence is received by the receiver; converging the output AGC coefficient from a value corresponding to the second training sequence to a value corresponding to the traffic sequence when the receiver receives the traffic sequence;

a memory 1205 for storing data and information.

In fig. 12, a bus architecture (represented by bus 1200), the bus 1200 may include any number of interconnected buses and bridges, and the bus 1200 links together various circuits including one or more processors, represented by processor 1202, and memory, represented by memory 1205. The bus 1200 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 1203 provides an interface between the bus 1200 and the receiver 1201 and transmitter 1206. The receiver 1201 and the transmitter 1206 may be one element or may be multiple elements, such as multiple receivers and transmitters, providing means for communicating with various other apparatus over a transmission medium. Data processed by the processor 1202 is transmitted over a wireless medium via the antenna 1204, and further, the antenna 1204 receives the data and transmits the data to the processor 1202.

The processor 1202 is responsible for managing the bus 1200 and general processing, and may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And the memory 1205 may be used to store data used by the processor 1202 in performing operations.

Optionally, the processor 1202 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD).

Preferably, the processor 1202 is specifically configured to:

Preferably, the receiver 1201 is specifically configured to:

Preferably, the processor 1202 is specifically configured to:

Preferably, the processor 1202 is further configured to:

Fig. 13 is a schematic structural diagram illustrating a second transceiver device according to an embodiment of the present invention.

Based on the same concept, the present invention provides a second transceiver device, as shown in fig. 13, comprising a receiver 1301, a processor 1302, and a transmitter 1306:

a receiver 1301, configured to receive, under the control of the processor 1302, the optimized coding format and the optimized power sent by the first transceiver device, and a service sequence; the optimized coding format and the optimized power are determined by the first transceiver device according to a first training sequence for channel estimation;

a processor 1302 configured to determine a second training sequence, which is modulated using the optimized power and a first coding format known to the first transceiver device; modulating the service sequence by using the optimized power and the optimized coding format;

a transmitter 1306, configured to send the modulated second training sequence to the first transceiver device under the control of the processor 1302, and send the modulated service sequence to the first transceiver device; the second training sequence is used for enabling an Automatic Gain Control (AGC) module of the first transceiver to converge the output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulating the modulated second training sequence according to the known first coding format; the service sequence is used for enabling the AGC module of the first transceiver device to converge the output AGC coefficient from a value corresponding to the second training sequence to a value corresponding to the service sequence;

the memory 1305 is used for storing data and information.

In fig. 13, a bus architecture (represented by bus 1300), bus 1300 may include any number of interconnected buses and bridges, bus 1300 linking together various circuits including one or more processors, represented by processor 1302, and memory, represented by memory 1305. The bus 1300 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 1303 provides an interface between the bus 1300 and the receiver 1301 and the transmitter 1306. Receiver 1301 and transmitter 1306 may be one element or multiple elements, such as multiple receivers and transmitters, providing means for communicating with various other apparatus over a transmission medium. Data processed by the processor 1302 is transmitted over a wireless medium via the antenna 1304, and further, the antenna 1304 receives the data and transmits the data to the processor 1302.

The processor 1302 is responsible for managing the bus 1300 and general processing, and may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions. And memory 1305 may be used to store data used by processor 1302 in performing operations.

Alternatively, processor 1302 may be a CPU, ASIC, FPGA, or CPLD.

Preferably, the processor 1302 is specifically configured to:

Preferably, the processor 1302 is further configured to:

transmitter 1306, further configured to:

Fig. 14 exemplarily shows a schematic structural diagram of a data transmission system provided by an embodiment of the present invention.

Based on the same conception, the embodiment of the invention provides a data transmission system, as shown in fig. 14, comprising a second transceiver device 1401 and a first transceiver device 1402:

the second transceiver 1401, configured to receive the optimized encoding format and the optimized power sent by the first transceiver; determining a second training sequence, modulating the second training sequence by using the optimized power and a first coding format known to the first transceiver device, and sending the modulated second training sequence to the first transceiver device; the second transceiver receives the service sequence, modulates the service sequence by using the optimized power and the optimized coding format, and sends the modulated service sequence to the first transceiver;

the first transceiver 1402, configured to receive a first training sequence sent by the second transceiver, and send an optimized coding format and optimized power determined by performing channel estimation according to the first training sequence to the second transceiver; receiving a second training sequence which is transmitted by the second transceiver and modulated by the optimized power and a first coding format known by the first transceiver; the AGC coefficient output by the automatic gain control AGC module converges from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and the modulated second training sequence is demodulated according to the first coding format; receiving a service sequence which is transmitted by the second transceiver and modulated by using the optimized power and the optimized coding format; the AGC coefficients output by the AGC block converge from a value corresponding to the second training sequence to a value corresponding to the traffic sequence.

It should be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method of data transmission, comprising:

the method comprises the steps that a first transceiver receives a first training sequence sent by a second transceiver, and sends an optimized coding format and optimized power determined by channel estimation according to the first training sequence to the second transceiver;

the first transceiver device receives a second training sequence which is transmitted by the second transceiver device and modulated by using the optimized power and a first coding format known to the first transceiver device;

the AGC coefficient output by an Automatic Gain Control (AGC) module of the first transceiver equipment converges from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and the second training sequence after modulation is demodulated according to the first coding format;

the first transceiver device receives a service sequence which is transmitted by the second transceiver device and modulated by using the optimized power and the optimized coding format;

2. The method of claim 1, wherein the AGC coefficients output by the AGC module of the first transceiver device converge from a value corresponding to the first training sequence to a value corresponding to the second training sequence, comprising:

the AGC coefficient output by the AGC module of the first transceiver device converges from a value corresponding to the first training sequence to a minimum of all values corresponding to the second training sequence.

3. The method of claim 1 or 2, wherein the first transceiver device receiving the first training sequence transmitted by the second transceiver device comprises:

the first transceiver device receives the first training sequence which is transmitted by the second transceiver device and modulated by using second power through N sub-channels;

4. The method of claim 3, wherein the first transceiver device receives the first training sequence transmitted by the second transceiver device before receiving the second training sequence, further comprising:

5. The method of claim 1 or 2, wherein after receiving the first training sequence and before receiving the second training sequence by the first transceiver device, further comprising:

the first transceiver device performs nonlinear equalization on the received first training sequence by using a first nonlinear equalization coefficient; wherein the first non-linear equalization coefficient is determined according to the first training sequence and a channel estimation result;

the first transceiver device performs demodulation operation on the modulated second training sequence according to the first coding format, including:

the first transceiver device performs nonlinear equalization on the received modulated second training sequence by using the first nonlinear equalization coefficient;

and the first transceiver device performs pre-demodulation operation on the sequence obtained after the nonlinear equalization, and decodes the sequence obtained after the pre-demodulation operation according to the first coding format.

6. The method of claim 5, wherein the first non-linear equalization coefficient is obtained by:

the first transceiver device multiplies the first training sequence by the channel estimation result to obtain a nonlinear sequence;

the first transceiver device determines the first nonlinear equalization coefficient according to the nonlinear sequence.

7. A method of data transmission, comprising:

the second transceiver device determines a second training sequence, modulates the second training sequence by using the optimized power and a first coding format known to the first transceiver device, and sends the modulated second training sequence to the first transceiver device, wherein the second training sequence is used for enabling an Automatic Gain Control (AGC) module of the first transceiver device to converge an output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulates the modulated second training sequence according to the known first coding format;

and the second transceiver receives a service sequence, modulates the service sequence by using the optimized power and the optimized coding format, and sends the modulated service sequence to the first transceiver, wherein the service sequence is used for enabling the AGC module of the first transceiver to converge the output AGC coefficient from a value corresponding to the second training sequence to a value corresponding to the service sequence.

8. The method of claim 7, wherein the second transceiver device modulates the traffic sequence using the optimized power and the optimized coding format, comprising:

9. The method of claim 7 or 8, wherein before the second transceiver device receives the optimized coding format and the optimized power transmitted by the first transceiver device, further comprising:

10. The method of claim 9, wherein the optimized coding format and the optimized power are obtained by:

11. A transceiver device, comprising:

a sending module, configured to send the determined optimized coding format and the optimized power to the other transceiver device;

an automatic gain module, AGC, module for converging an output AGC coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence when the receiving module receives the second training sequence; and when the receiving module receives the service sequence, converging the output AGC coefficient from a value corresponding to the second training sequence to a value corresponding to the service sequence.

12. The transceiver device of claim 11, wherein the AGC module is specifically configured to:

and when the receiving module receives the second training sequence, converging the output AGC coefficient from the value corresponding to the first training sequence to the minimum value of all the values corresponding to the second training sequence.

13. The transceiver device of claim 11 or 12, wherein the receiving module is specifically configured to:

receiving the first training sequence which is transmitted by the other transceiver and modulated by using second power through N sub-channels;

14. The transceiver device of claim 13, wherein the processing module is specifically configured to:

15. The transceiver device of claim 11 or 12, further comprising a non-linear equalization module to:

when the receiving module receives the first training sequence, the received first training sequence is subjected to nonlinear equalization by using a first nonlinear equalization coefficient; wherein the first non-linear equalization coefficient is determined according to the first training sequence and a channel estimation result;

when the receiving module receives the second training sequence, the received modulated second training sequence is subjected to nonlinear equalization by using the first nonlinear equalization coefficient;

the demodulation module is specifically configured to:

16. The transceiver device of claim 15, further comprising a non-linear equalization coefficient calculation module to:

multiplying the first training sequence and the channel estimation result to obtain a nonlinear sequence;

and determining the first nonlinear equalization coefficient according to the nonlinear sequence.

17. A transceiver device, comprising:

the receiving module is used for receiving the optimized coding format and the optimized power which are sent by the other transceiver and the service sequence; wherein the optimized coding format and the optimized power are determined by the other transceiver device based on a first training sequence used for channel estimation;

a modulation module configured to determine a second training sequence, and modulate the second training sequence using the optimized power and a first coding format known to the another transceiver device; modulating the service sequence by using the optimized power and the optimized coding format;

a sending module, configured to send the modulated second training sequence to the other transceiver device, and send the modulated service sequence to the other transceiver device; the second training sequence is used for enabling an Automatic Gain Control (AGC) module of the other transceiver to converge output AGC coefficients from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulating the modulated second training sequence according to the known first coding format; the traffic sequence is used to cause the AGC module of the other transceiver device to converge the output AGC coefficients from values corresponding to the second training sequence to values corresponding to the traffic sequence.

18. The transceiver device of claim 17, wherein the modulation module is specifically configured to:

modulating a received traffic sequence after a first time using the optimized power and the optimized coding format;

the time length between the first time and the starting time of the second training sequence after the transceiver device transmits the modulation is not less than the convergence time length; the convergence duration is a duration in which the AGC coefficient output by the AGC module of the other transceiver device converges from a value corresponding to the first training sequence to a minimum value among all values corresponding to the second training sequence.

19. The transceiver device of claim 17 or 18, wherein the modulation module is further configured to:

determining the first training sequence and modulating the first training sequence by using second power;

the sending module is further configured to:

transmitting the modulated first training sequence to the other transceiver device through N sub-channels;

20. The transceiver device of claim 19, wherein the optimized coding format and the optimized power are obtained by:

and the other transceiver device optimizes the coding formats and the powers of the N subchannels according to the channel estimation result, and determines the optimized coding formats and the optimized powers of the N subchannels.

21. A transceiver device, comprising:

a receiver, configured to receive a first training sequence sent by another transceiver device, a second training sequence sent by the another transceiver device and modulated by using the optimized power and a first coding format known to the transceiver device, and a traffic sequence sent by the another transceiver device and modulated by using the optimized power and the optimized coding format;

a transmitter, configured to transmit the determined optimized coding format and the optimized power to the other transceiver device;

the processor is used for carrying out channel estimation according to the first training sequence and determining an optimized coding format and optimized power; demodulating the modulated second training sequence according to the first coding format; means for converging an output automatic gain module (AGC) coefficient from a value corresponding to the first training sequence to a value corresponding to the second training sequence when the receiver receives the second training sequence; and when the receiver receives the service sequence, the output AGC coefficient is converged from the value corresponding to the second training sequence to the value corresponding to the service sequence.

22. The transceiver device of claim 21, wherein the processor is specifically configured to:

upon receipt of the second training sequence by the receiver, the output AGC coefficients are converged from the values corresponding to the first training sequence to the minimum of all the values corresponding to the second training sequence.

23. The transceiver device of claim 21 or 22, wherein the receiver is specifically configured to:

receiving a first training sequence which is transmitted by the other transceiver and modulated by using second power through N sub-channels;

24. The transceiver device of claim 23, wherein the processor is specifically configured to:

25. The transceiver device of claim 21 or 22, wherein the processor is further configured to:

when the receiver receives the first training sequence, carrying out nonlinear equalization on the received first training sequence by using a first nonlinear equalization coefficient; wherein the first non-linear equalization coefficient is determined according to the first training sequence and a channel estimation result;

when the receiver receives the second training sequence, the receiver uses the first nonlinear equalization coefficient to perform nonlinear equalization on the received modulated second training sequence;

26. The transceiver device of claim 25, wherein the processor is further configured to:

27. A transceiver device, comprising:

the receiver is used for receiving the optimized coding format and the optimized power which are sent by the other transceiver device and a service sequence; wherein the optimized coding format and the optimized power are determined by the other transceiver device based on a first training sequence used for channel estimation;

a processor configured to determine a second training sequence, the second training sequence being modulated using the optimized power and a first coding format known to the other transceiver device; modulating the service sequence by using the optimized power and the optimized coding format;

a transmitter, configured to send the modulated second training sequence to the another transceiver device, and send the modulated service sequence to the another transceiver device; the second training sequence is used for enabling an Automatic Gain Control (AGC) module of the other transceiver to converge output AGC coefficients from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and demodulating the modulated second training sequence according to the known first coding format; the traffic sequence is used to cause the AGC module of the other transceiver device to converge the output AGC coefficients from values corresponding to the second training sequence to values corresponding to the traffic sequence.

28. The transceiver device of claim 27, wherein the processor is specifically configured to:

29. The transceiver device of claim 27 or 28, wherein the processor is further configured to:

the transmitter is further configured to:

30. The transceiver device of claim 29, wherein the optimized coding format and the optimized power are obtained by:

31. A data transmission system, comprising:

the first transceiver device is used for receiving a first training sequence sent by a second transceiver device and sending an optimized coding format and optimized power determined by channel estimation according to the first training sequence to the second transceiver device; receiving a second training sequence which is transmitted by the second transceiver and modulated by using the optimized power and a first coding format known by the first transceiver; the AGC coefficient output by the automatic gain control AGC module converges from a value corresponding to the first training sequence to a value corresponding to the second training sequence, and the second training sequence after modulation is demodulated according to the first coding format; receiving a service sequence which is transmitted by the second transceiver and modulated by using the optimized power and the optimized coding format; the AGC coefficient output by the AGC module converges from a value corresponding to the second training sequence to a value corresponding to the traffic sequence;

the second transceiver is used for receiving the optimized coding format and the optimized power sent by the first transceiver; determining a second training sequence, modulating the second training sequence by using the optimized power and a first coding format known to the first transceiver device, and sending the modulated second training sequence to the first transceiver device; and the second transceiver receives a service sequence, modulates the service sequence by using the optimized power and the optimized coding format, and sends the modulated service sequence to the first transceiver.