CN107710669A

CN107710669A - A kind of data transmission method, transceiver and system

Info

Publication number: CN107710669A
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: 2018-02-16
Anticipated expiration: 2035-09-21
Also published as: WO2017049443A1; CN107710669B

Abstract

A kind of data transmission method, transceiver and system, to reduce transceiver from received training sequence switch to receive traffic sequence when TR phase demodulation noises.The embodiment of the present invention includes：First transceiver receives the first training sequence that the second transceiver is sent, second transceiver will be sent to power after optimization according to coded format after the optimization that the first training sequence progress channel estimation is determined, receive the second training sequence being modulated using the first coded format known to power after optimization and the first transceiver, the AGC coefficients of the AGC modules output of first transceiver converge to the value corresponding to the second training sequence from the value corresponding to the first training sequence, and operation is demodulated to the second training sequence after modulation according to the first coded format；Receive using the traffic sequence that coded format is modulated after power after optimization and optimization, the AGC coefficients of AGC modules output converge to the value corresponding to traffic sequence from the value corresponding to the second training sequence.

Description

A kind of data transmission method, transceiver and system

Technical field

The present invention relates to optical communication field more particularly to a kind of data transmission methods, transceiver and system.

Background technique

With the development of internet, the short distance communication system applied to metropolitan area and access network gradually tends to large capacity low cost.Based on discrete multitone (Discrete Multi-Tone, abbreviation DMT) intensity modulated-directly detection (Intensity modulation-direct detection, abbreviation IM-DD) technology become one of current main-stream technology due to the features such as its structure is simple, the availability of frequency spectrum is high, anti-impulsive noise ability is strong, at low cost.

Communication channel is divided into enough narrowband subchannels by DMT, according to the channel estimation results of every sub-channels, for corresponding quadrature amplitude modulation (Quadrature Amplitude Modulation, the abbreviation QAM) coded format of each subchannel distribution subchannel and power.DMT technology carries out independent modulation to every sub-channels, thus by limited power application in the relatively better subchannel of performance, to improve the availability of frequency spectrum.

DMT system includes two states, channel estimation state and working condition.First transceiver predefines the initial time of channel estimation state and the initial time of working condition, and the initial time of the initial time of channel estimation state and working condition is sent to the second transceiver, to make the second transceiver and the first transceiver enter channel estimation state in the initial time of channel estimation state simultaneously, enter working condition in the initial time of working condition.

In the channel estimation state of DMT, the parameters such as the QAM coded format of every sub-channels and power are sent to the second transceiver in advance by the first transceiver, and the performance number that every sub-channels are distributed is usually non-zero power value.Second transceiver generates serial training sequence, and training sequence is assigned to parallel in all subchannels through serioparallel exchange, the second transceiver is modulated the training sequence in the subchannel using the corresponding QAM coded format of every sub-channels and power received respectively.It later will be in all subchannels by inverse fast Fourier transform (Inverse Fast Fourier Transformation, abbreviation IFFT) Training sequence be converted to time-domain signal, and add cyclic prefix (Cyclic Prefix, abbreviation CP) and papr (Peak to Average Power Ratio, abbreviation PAPR) slicing, most the first transceiver is sent to through digital-to-analogue conversion (Digital-to-Analog Converter, abbreviation DAC) device afterwards.First transceiver receives after training sequence, channel estimation is carried out to every sub-channels, and power after determining QAM modulation format after optimizing for every sub-channels in all subchannels and optimize, and power after QAM modulation format after optimization and optimization is sent to the second transceiver.

In DMT working condition, the second transceiver is modulated the traffic sequence received using power after QAM modulation format after the optimization of every sub-channels and optimization, and modulated traffic sequence is sent to the first transceiver.First transceiver is through analog-to-digital conversion (Analog-to-Digital Converter, abbreviation ADC) traffic sequence received is converted to digital signal by device, and pass through automatic growth control (Automatic Gain Control, abbreviation AGC) gain control is carried out to the signal amplitude of the traffic sequence received, and realize that the clock source of the first transceiver and the second transceiver is synchronous by T/R module, the traffic sequence received is successively removed into cyclic prefix later, carry out fast Fourier transform (Fast Fourier Transformation, abbreviation FFT), channel equalization, QAM decoding and parallel-serial conversion, to recover original traffic sequence.

In channel estimation state, the performance number that every sub-channels are distributed is non-zero power value, and in the operating condition, due to being influenced by bandwidth characteristic, performance number is generally concentrated in the subchannel of low-frequency range, and the performance number in certain subchannels of high band is zero at this time.Due in the operating condition, when second transceiver transmits signal to the first transceiver by the subchannel of low-frequency range, the general power of signal is lost smaller in transmission process, therefore the general power of signal of the general power than receiving under channel estimation state of signal that the first transceiver receives in the operating condition is big.That is, the general power for the signal that the first transceiver receives will increase when the first transceiver is switched to working condition from channel estimation state, the range value of signal is also increased with it.

First transceiver includes AGC module, and when the first transceiver receives signal, AGC module carries out gain control to the signal received, the mean power output kept constant so as to the signal for receiving the first transceiver.Specific practice is, in channel estimation state, when the signal amplitude that the first transceiver receives is smaller, AGC exports a biggish AGC coefficient, in order to which signal amplitude is turned up, In working condition, when the signal amplitude that the first transceiver receives is larger, AGC exports a lesser AGC coefficient, in order to turn down signal amplitude.As it can be seen that when switching to working condition from channel estimation state, AGC coefficient is from becoming smaller greatly.Fig. 1 a illustrates AGC index variation schematic diagram when the first transceiver switches to working condition from channel estimation state.As shown in Figure 1a, AGC coefficient is from becoming smaller greatly, need a convergence duration, in the convergence duration of AGC, since the fluctuation of AGC coefficient is bigger, therefore channel estimation results are also mismatched with actual channel situation in convergence duration, it is higher so as to cause bit error rate when QAM decoding, clock recovery (Time Recover is carried out according to the decoded traffic sequence of QAM so as to cause the first transceiver, abbreviation TR) phase demodulation when, noise increases, as shown in Figure 1 b, Fig. 1 b illustrates TR phase demodulation schematic diagram when the first transceiver switches to working condition from channel estimation state, as can be seen from Figure, the duration stage is restrained in AGC, TR phase demodulation noise is larger, the increase of TR phase demodulation noise exacerbates the risk that TR collapses when being switched to working condition from channel estimation state.

Summary of the invention

The embodiment of the present invention provides a kind of data transmission method, transceiver and system, TR phase demodulation noise when receiving traffic sequence is switched to from received training sequence to reduce transceiver, to reduce the risk of TR collapse.

First aspect provides a kind of data transmission method, comprising:

First transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；

First transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；

The AGC coefficient of the automatic growth control AGC module output of first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；

The traffic sequence that coded format is modulated after first transceiver receives power after the use that the second transceiver is sent optimizes and optimizes；

The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.

With reference to first aspect, in the first possible implementation of the first aspect, the AGC coefficient of the AGC module output of the first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, specifically includes:

The AGC coefficient of the AGC module output of first transceiver converges to the minimum value in the value for all corresponding to the second training sequence from the value for corresponding to the first training sequence.

With reference to first aspect or the first possible implementation of first aspect, in the second possible implementation of the first aspect, the first transceiver receives the first training sequence that the second transceiver is sent, comprising:

First transceiver receives the first training sequence that the second power of use that the second transceiver is sent is modulated by N number of subchannel；

Wherein, N is the integer more than or equal to 1；Second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.

The possible implementation of second with reference to first aspect, in a third possible implementation of the first aspect, after the first transceiver receives the first training sequence that the second transceiver is sent, before the second training sequence of reception, further includes:

First transceiver carries out channel estimation according to the first training sequence, obtains channel estimation results；

First transceiver optimizes the coded format and power of N number of subchannel according to channel estimation results, determines coded format and power after optimization after the optimization of N number of subchannel.

Any possible implementation into the third possible implementation of first aspect with reference to first aspect, in a fourth possible implementation of the first aspect, after first transceiver receives the first training sequence, before the second training sequence of reception, further includes:

First transceiver carries out nonlinear equalization to the first training sequence received using the first nonlinear equalization coefficient；Wherein, the first nonlinear equalization coefficient is determined according to the first training sequence and channel estimation results；

First transceiver carries out demodulation behaviour to modulated second training sequence according to the first coded format Make, comprising:

First transceiver carries out nonlinear equalization to modulated second training sequence received using the first nonlinear equalization coefficient；

First transceiver carries out pre-demodulating operation to the sequence obtain after nonlinear equalization, and according to the first coded format, is decoded to the sequence obtain after pre-demodulating operation.

The 4th kind of possible implementation with reference to first aspect, in first aspect the without planting in possible implementation, the first nonlinear equalization coefficient obtains in the following manner:

First training sequence is multiplied by the first transceiver with channel estimation results, obtains non-linear sequence；

First transceiver determines the first nonlinear equalization coefficient according to non-linear sequence.

Second aspect provides a kind of data transmission method, comprising:

Coded format and power after optimization after the optimization that second transceiver the first transceiver of reception is sent, wherein coded format and power after optimization are that the first transceiver is determined according to the first training sequence for being used to carry out channel estimation after optimization；

Second transceiver determines the second training sequence, the second training sequence is modulated using the first coded format known to power after optimization and the first transceiver, and modulated second training sequence is sent to the first transceiver, second training sequence is used to make the automatic growth control AGC module of the first transceiver that the AGC coefficient of output is converged to the value corresponding to the second training sequence from the value corresponding to the first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；

Second transceiver receives traffic sequence, traffic sequence is modulated using coded format after power after optimization and optimization, and modulated traffic sequence is sent to the first transceiver, the value that traffic sequence is used to that the AGC module of the first transceiver to be made to converge to the AGC coefficient of output from the value for corresponding to the second training sequence corresponding to traffic sequence.

In conjunction with second aspect, in the first possible implementation of the second aspect, the second transceiver is modulated traffic sequence using coded format after power after optimization and optimization, comprising:

Second transceiver is modulated the traffic sequence received after the first moment using coded format after power after optimization and optimization；

Wherein, the first moment and the second transceiver send the initial time of modulated second training sequence Between duration not less than convergence duration；The AGC coefficient of the AGC module output of a length of first transceiver converges to the duration of the minimum value in the value for all corresponding to the second training sequence from the value for corresponding to the first training sequence when convergence.

In conjunction with the possible implementation of the first of second aspect or second aspect, in a second possible implementation of the second aspect, the second transceiver is received after the optimization that the first transceiver is sent after coded format and optimization before power, further includes:

Second transceiver determines the first training sequence, and is modulated using the second power to the first training sequence, and modulated first training sequence is sent to the first transceiver by N number of subchannel；

Wherein, N is integer more than or equal to 1, and the second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.

In conjunction with second of possible implementation of second aspect, in the third possible implementation of the second aspect, coded format and power after optimization obtain in the following manner after optimization:

First transceiver optimizes the coded format and power of N number of subchannel according to channel estimation results, determines the Optimized Coding Based format and optimization power of N number of subchannel.

The third aspect provides a kind of transceiver, comprising:

Receiving module, the traffic sequence that coded format is modulated after power and optimization after the use optimization that the second training sequence and another transceiver that the first coded format known to power and transceiver is modulated for receiving the first training sequence of another transceiver transmission, after the use optimization that another transceiver is sent are sent；

Processing module, for carrying out channel estimation according to the first training sequence, coded format and power after optimization after the optimization determined；

Sending module, for power after coded format after the optimization determined and optimization to be sent to another transceiver；

Demodulation module, for carrying out demodulation operation to modulated second training sequence according to the first coded format；

Automatic gain modules A GC module will be defeated for when receiving module receives the second training sequence AGC coefficient out converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence；When receiving module receives traffic sequence, the AGC coefficient of output is converged into the value corresponding to traffic sequence from the value for corresponding to the second training sequence.

In conjunction with the third aspect, in the first possible implementation of the third aspect, AGC module is specifically used for:

When receiving module receives the second training sequence, the AGC coefficient of output is converged into the minimum value in the value for all corresponding to the second training sequence from the value for corresponding to the first training sequence.

In conjunction with the possible implementation of the first of the third aspect or the third aspect, in the second possible implementation of the third aspect, receiving module is specifically used for:

The first training sequence being modulated by the second power of use that N number of subchannel receives the transmission of another transceiver；

In conjunction with second of possible implementation of the third aspect, in the third possible implementation of the third aspect, processing module is specifically used for:

Channel estimation is carried out according to the first training sequence, obtains channel estimation results；

According to channel estimation results, the coded format and power of N number of subchannel are optimized, determine coded format and power after optimization after the optimization of N number of subchannel.

In conjunction with the third aspect to the third aspect the third possible implementation in any possible implementation further include nonlinear equalization module, be used in the fourth possible implementation of the third aspect:

When receiving module receives the first training sequence, nonlinear equalization is carried out to the first training sequence received using the first nonlinear equalization coefficient；Wherein, the first nonlinear equalization coefficient is determined according to the first training sequence and channel estimation results；

When receiving module receives the second training sequence, nonlinear equalization is carried out to modulated second training sequence received using the first nonlinear equalization coefficient；

Demodulation module is specifically used for:

Pre-demodulating operation is carried out to the sequence obtain after nonlinear equalization, and according to the first coded format, the sequence obtain after pre-demodulating operation is decoded.

In conjunction with the 4th kind of possible implementation of the third aspect, in the third aspect the without planting in possible implementation, further includes nonlinear equalization coefficients calculation block, is used for:

First training sequence is multiplied with channel estimation results, obtains non-linear sequence；

The first nonlinear equalization coefficient is determined according to non-linear sequence.

Fourth aspect provides a kind of transceiver, comprising:

Receiving module, coded format and power and traffic sequence after optimization after the optimization for receiving the transmission of another transceiver；Coded format and power after optimization are that another transceiver is determined according to the first training sequence for carrying out channel estimation after wherein optimizing；

Modulation module is modulated the second training sequence using the first coded format known to power after optimization and another transceiver for determining the second training sequence；Traffic sequence is modulated using coded format after power after optimization and optimization；

Modulated traffic sequence is sent to another transceiver for modulated second training sequence to be sent to another transceiver by sending module；Second training sequence is used to make the automatic growth control AGC module of another transceiver that the AGC coefficient of output is converged to the value corresponding to the second training sequence from the value corresponding to the first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；The value that traffic sequence is used to that the AGC module of another transceiver to be made to converge to the AGC coefficient of output from the value for corresponding to the second training sequence corresponding to traffic sequence.

In conjunction with fourth aspect, in the first possible implementation of the fourth aspect, modulation module is specifically used for:

The traffic sequence received is modulated after the first moment using coded format after power after optimization and optimization；

Wherein, the first moment and transceiver send the duration between the initial time of modulated second training sequence not less than convergence duration；The AGC coefficient of the AGC module output of another a length of transceiver converges to the duration of the minimum value in the value for all corresponding to the second training sequence from the value for corresponding to the first training sequence when convergence.

In conjunction with the possible implementation of the first of fourth aspect or fourth aspect, in the second possible implementation of the fourth aspect, modulation module is also used to:

It determines the first training sequence, and the first training sequence is modulated using the second power；

Sending module is also used to:

Modulated first training sequence is sent to another transceiver by N number of subchannel；

In conjunction with second of possible implementation of fourth aspect, in the third possible implementation of the fourth aspect, coded format and power after optimization obtain in the following manner after optimization:

Another transceiver carries out channel estimation according to the first training sequence, obtains channel estimation results；

Another transceiver optimizes the coded format and power of N number of subchannel according to channel estimation results, determines the Optimized Coding Based format and optimization power of N number of subchannel.

5th aspect provides a kind of transceiver, comprising:

Receiver, the traffic sequence that coded format is modulated after power and optimization after the use optimization that the second training sequence and another transceiver that the first coded format known to power and transceiver is modulated for receiving the first training sequence of another transceiver transmission, after the use optimization that another transceiver is sent are sent；

Transmitter, for power after coded format after the optimization determined and optimization to be sent to another transceiver；

Processor, for carrying out channel estimation according to the first training sequence, coded format and power after optimization after the optimization determined；Demodulation operation is carried out to modulated second training sequence according to the first coded format；For when receiver receives the second training sequence, the automatic gain modules A GC coefficient of output to be converged to the value corresponding to the second training sequence from the value for corresponding to the first training sequence；When receiver receives traffic sequence, the AGC coefficient of output is converged into the value corresponding to traffic sequence from the value for corresponding to the second training sequence.

In conjunction with the 5th aspect, in the first possible implementation of the 5th aspect, processor is specifically used for:

When receiver receives the second training sequence, the AGC coefficient of output is converged into the minimum value in the value for all corresponding to the second training sequence from the value for corresponding to the first training sequence.

In conjunction with the first possible implementation of the 5th aspect or the 5th aspect, in second of possible implementation of the 5th aspect, receiver is specifically used for:

In conjunction with second of possible implementation of the 5th aspect, in the third possible implementation of the 5th aspect, processor is specifically used for:

In conjunction with the 5th aspect to the 5th aspect the third possible implementation in any possible implementation, the 5th aspect the 4th kind of possible implementation in, processor is also used to:

When receiver receives the first training sequence, nonlinear equalization is carried out to the first training sequence received using the first nonlinear equalization coefficient；Wherein, the first nonlinear equalization coefficient is determined according to the first training sequence and channel estimation results；

When receiver receives the second training sequence, nonlinear equalization is carried out to modulated second training sequence received using the first nonlinear equalization coefficient；

In conjunction with the 4th kind of possible implementation of the 5th aspect, at the 5th aspect the without planting in possible implementation, processor is also used to:

6th aspect provides a kind of transceiver, comprising:

Receiver, coded format and power and traffic sequence after optimization after the optimization for receiving the transmission of another transceiver；Coded format and power after optimization are that another transceiver is determined according to the first training sequence for carrying out channel estimation after wherein optimizing；

Processor is modulated the second training sequence using the first coded format known to power after optimization and another transceiver for determining the second training sequence；Traffic sequence is modulated using coded format after power after optimization and optimization；

Modulated traffic sequence is sent to another transceiver for modulated second training sequence to be sent to another transceiver by transmitter；Second training sequence is used to make the automatic growth control AGC module of another transceiver that the AGC coefficient of output is converged to the value corresponding to the second training sequence from the value corresponding to the first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；The value that traffic sequence is used to that the AGC module of another transceiver to be made to converge to the AGC coefficient of output from the value for corresponding to the second training sequence corresponding to traffic sequence.

In conjunction with the 6th aspect, in the first possible implementation of the 6th aspect, processor is specifically used for:

In conjunction with the first possible implementation of the 6th aspect or the 6th aspect, in second of possible implementation of the 6th aspect, processor is also used to:

Transmitter is also used to:

In conjunction with second of possible implementation of the 6th aspect, in the third possible implementation of the 6th aspect, coded format and power after optimization obtain in the following manner after optimization:

7th aspect provides a kind of data transmission system, comprising:

Power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver for receiving the first training sequence of the second transceiver transmission by the first transceiver；Receive the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization of the second transceiver transmission；The AGC coefficient of automatic growth control AGC module output converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after receiving power after the use that the second transceiver is sent optimizes and optimizing；The AGC coefficient of AGC module output converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence；

Second transceiver, coded format and power after optimization after the optimization for receiving the transmission of the first transceiver；It determines the second training sequence, the second training sequence is modulated using the first coded format known to power after optimization and the first transceiver, and modulated second training sequence is sent to the first transceiver；Second transceiver receives traffic sequence, is modulated using coded format after power after optimization and optimization to traffic sequence, and modulated traffic sequence is sent to the first transceiver.

In the embodiment of the present invention, the first transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；First transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after first transceiver receives power after the use that the second transceiver is sent optimizes and optimizes；The AGC coefficient of the AGC module output of first transceiver is from corresponding to the The value of two training sequences converges to the value corresponding to traffic sequence.Since the first transceiver is after carrying out channel estimation according to the first training sequence, receive the second training sequence using algorithm for power modulation after the first coded format and optimization, at this time, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, during AGC coefficient is convergent, since known first coded format can be used to be decoded the second training sequence for the first transceiver, therefore, error rate when first transceiver is decoded for the second training sequence is almost nil, to which the first transceiver is during from the first training sequence of reception to the second training sequence of reception, first transceiver is lower using noise when decoded second training sequence progress TR phase demodulation, when receiving the second training sequence to reduce The risk of TR collapse.When receiving traffic sequence further as the first transceiver, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to traffic sequence from the value for corresponding to the second training sequence, but since the second training sequence and traffic sequence are modulated using power after optimization, that is the value that the AGC coefficient of the AGC module of the first transceiver corresponds to the second training sequence is approached with the value for corresponding to traffic sequence, first transceiver is during from the second training sequence of reception to reception traffic sequence, the fluctuation of AGC coefficient is little, therefore, error rate is lower when first transceiver is decoded traffic sequence, in turn, noise is lower when first transceiver is for traffic sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.

Detailed description of the invention

To describe the technical solutions in the embodiments of the present invention more clearly, attached drawing needed in describing below to embodiment is briefly introduced, apparently, drawings in the following description are only some embodiments of the invention, for those of ordinary skill in the art, without any creative labor, it is also possible to obtain other drawings based on these drawings.

Fig. 1 a is AGC index variation schematic diagram when the first transceiver switches to working condition from channel estimation state in background technique；

Fig. 1 b is TR phase demodulation schematic diagram when the first transceiver switches to working condition from channel estimation state in background technique；

Fig. 2 is a kind of data transmission system configuration diagram that the embodiment of the present invention is applicable in；

Fig. 3 is a kind of flow diagram of data transmission method provided in an embodiment of the present invention；

Fig. 3 a is the correspondence diagram of the signal-to-noise ratio measured in advance and power load, bit load corresponding to sub-carriers of the embodiment of the present invention；

Fig. 4 is a kind of flow diagram of data transmission method provided in an embodiment of the present invention；

Fig. 5 is another data transmission system configuration diagram that the embodiment of the present invention is applicable in；

Fig. 6 is the flow diagram of another data transmission method provided in an embodiment of the present invention；

Fig. 7 is another data transmission system configuration diagram that the embodiment of the present invention is applicable in；

Fig. 8 is the flow diagram of another data transmission method provided in an embodiment of the present invention；

Fig. 9 is the flow diagram of another data transmission method provided in an embodiment of the present invention；

Figure 10 is a kind of structural schematic diagram of first transceiver provided in an embodiment of the present invention；

Figure 11 is a kind of structural schematic diagram of second transceiver provided in an embodiment of the present invention；

Figure 12 is the structural schematic diagram of another first transceiver provided in an embodiment of the present invention；

Figure 13 is the structural schematic diagram of another second transceiver provided in an embodiment of the present invention；

Figure 14 is a kind of structural schematic diagram of data transmission system provided in an embodiment of the present invention.

Specific embodiment

In order to which the purpose of the present invention, technical solution and beneficial effect is more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.

The embodiment of the present invention is suitable for a variety of Transmission systems, and the embodiment of the present invention is without limitation, convenient to introduce, and is introduced by taking the IM-DD technology based on DMT as an example in following embodiment.The first transceiver and the second transceiver in the embodiment of the present invention all have and send and receive function.Optionally, first transceiver can be receiver, second transceiver can be transmitter, there are two communication channels between transmitter and receiver, one sends information to receiver for transmitter, another independent communication channel between transmitter and receiver sends information to transmitter for receiver.

Fig. 2 illustrates a kind of applicable system architecture schematic diagram of the embodiment of the present invention.As shown in Fig. 2, including the second transceiver 101 and the first transceiver 102.Second transceiver 101 includes at least Second transceiver negotiation module 110, training sequence generation module 104, selecting module 106, the second transceiver 101 further includes DAC module.First transceiver 102 includes at least the first transceiver negotiation module 124, ADC module 114, AGC module 115, T/R module 116, TR phase demodulation module 120, channel estimation and channel compensation block 121, decoder module 122, parallel serial conversion module 125.First transceiver 102 may also include nonlinear equalization module 117, nonlinear equalization coefficients calculation block 118.

In DMT technology, communication channel is divided into enough narrowband subchannels, than subchannel 1 as shown in Figure 2, subchannel 2 ... subchannel N, every sub-channels can carry out independent modulation according to the corresponding coded format of the subchannel and power.

Fig. 2 shows system architecture in, there is communication channel between second transceiver negotiation module 110 of the second transceiver 101 and the first transceiver negotiation module 124 of the first transceiver, can be used between the second transceiver 101 and the first transceiver 102 sending and receiving information mutually.

Second transceiver 101 can receive traffic sequence 103, can also generate training sequence, such as the first training sequence and the second training sequence by training sequence generation module 104.In second transceiver 101, the training sequence of traffic sequence 103 and the generation of training sequence generation module 104 carries out bit load and serioparallel exchange, and traffic sequence and training sequence enter selecting module 106 later.Selecting module 106 is selected in training sequence and traffic sequence in the control of the second transceiver negotiation module 110, later exports the sequence of selection.The sequence that selecting module 106 exports is loaded into N number of subchannel, every sub-channels encode the sequence loaded in the subchannel using the corresponding coded format of the subchannel, such as, it is encoded using the sequence on 1 sub-channel 1 of coded format, it is encoded using the sequence on 2 sub-channel 2 of coded format, ..., it is encoded using the sequence on coded format N sub-channel N.And the corresponding power of the subchannel is loaded for every sub-channels, for example load power 1 for subchannel 1, power 2 ... is loaded for subchannel 2, loads power N for subchannel N.Sequence in N number of subchannel is carried out IFFT by the second transceiver 101, so that the training sequence in all subchannels is converted to time-domain signal, and is added CP and PAPR slicing, is most sent to the first transceiver 102 through DAC afterwards.Preferably, the coded format in the embodiment of the present invention can be QAM coded format.

Specifically, the DAC signal exported is passed sequentially through light emitting secondary module (Transmitter Optical Subassembly, abbreviation TOSA) 111, fiber channel 112 and light-receiving by the second transceiver 101 Enter the ADC module 114 of the first transceiver 102 after secondary module (Receiver Optical Subassembly, abbreviation ROSA) 113.When the medium that TOSA111, fiber channel 112 and ROSA113 are transmitted as signal, signal will receive the influence of device low-pass characteristic and nonlinear distortion characteristic etc. in transmission process.

The analog signal received is converted to digital signal by the ADC module 114 of the first transceiver, and carries out gain control by signal amplitude of the AGC module 115 to the sequence received.It realizes that the first transceiver 102 is synchronous with the clock source of the second transceiver 101 by T/R module 116 later, is input in nonlinear equalization module 117 later, nonlinear equalization is carried out, with non-linear distortion of the thermal compensation signal in transmission process.The sequence that nonlinear equalization module 117 exports successively removes CP, and is input to channel estimation and channel compensation block 121 after carrying out FFT, to carry out channel equalization, channel estimation and channel compensation.The sequence that channel estimation and channel compensation block 121 export sequentially enters in decoder module 122 and parallel serial conversion module 125, successively by decoding and parallel-serial conversion, the first transceiver 102 exports the sequence that the first transceiver 102 is recovered later, such as, the transmission of second transceiver 101 is traffic sequence, then 102 outgoing traffic sequence of the first transceiver, the transmission of the second transceiver 101 is training sequence, then the first transceiver 102 exports training sequence.

In the signal processing of above-mentioned first transceiver 102, T/R module 116 need to receive the signal of the input of TR phase demodulation module 120, and TR phase demodulation module 120 needs to receive the sequence successively removed after CP and FFT, and decoded sequence, and according to the sequence and decoded sequence progress TR phase demodulation after successively removal CP and FFT.The nonlinear equalization coefficient that nonlinear equalization module 117 needs to be inputted according to nonlinear equalization coefficients calculation block 118 carries out nonlinear equalization.

In the embodiment of the present invention, in channel estimation state, first transceiver 102 can also generate the first training sequence by training sequence generation module 104, and the first training sequence is sent to the first transceiver 102, after first transceiver 102 carries out channel estimation according to the first training sequence, channel estimation results are obtained.The sequence exported in conjunction with channel estimation results and channel estimation and channel compensation block 121, and DMT sub-carrier power/constellation distribution algorithm, the parameter that every sub-channels in all subchannels are currently distributed, for example coded format and power etc. optimize, power after determining coded format after optimizing and optimizing, to which limited power application in the relatively better subchannel of performance, is improved spectrum utilization Rate.

After first transceiver is determined coded format after optimizing and is optimized after power, it can be sent to the second transceiver negotiation module 110 of the second transceiver, by the first transceiver negotiation module 124 so as to be modulated the second transceiver 101 to the traffic sequence 103 received using power after coded format after optimization and optimization.

Fig. 3 illustrates a kind of flow diagram of data transmission method provided in an embodiment of the present invention.

Based on above content, as shown in figure 3, the embodiment of the present invention provides a kind of data transmission method, comprising:

Step 301, the first transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；

Step 302, the first transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；

Step 303, the AGC coefficient of the automatic growth control AGC module output of the first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；

Step 304, the traffic sequence that power is modulated with coded format after optimization after the use that the first transceiver receives that the second transceiver is sent optimizes；

Step 305, the AGC coefficient of the AGC module output of the first transceiver converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.

In the embodiment of the present invention, three kinds of states are defined for the first transceiver and the second transceiver, channel estimation state, channel estimation charging state and working condition, the initial time of channel estimation state was defined as the second moment, the initial time of channel estimation charging state is defined as the third moment, and the initial time of working condition was defined as the first moment.Second transceiver and the first transceiver can determine the first moment, the second moment and third moment in several ways, for example, being set by way of the unified notice of network signal, by the first transmitting-receiving by way of the second transceiver and the first transceiver are negotiated in advance, by higher layer server It is standby determine and be sent to the mode of the second transceiver, determined by the second transceiver after and be sent to the mode of the first transceiver, or the mode etc. by human configuration.A kind of optional embodiment is to be determined as the second moment at the time of system boot, after system boot, the second transceiver and the first transceiver are automatically into channel estimation state.

Second transceiver and the first transceiver enter channel estimation state at the second moment, optionally a kind of embodiment is, second transceiver determines the first training sequence, and the first training sequence is modulated using the second power, and modulated first training sequence is sent to the first transceiver by N number of subchannel, wherein N is the integer more than or equal to 1, second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.Optionally, the second transceiver is modulated the first training sequence using the second power and the second coded format.

A kind of optional embodiment is, due to transmitting information by independent communication channel between the second transceiver negotiation module of the second transceiver and the first transceiver negotiation module of the first transceiver, therefore the second transceiver and the first transceiver can be held consultation by the second transceiver negotiation module and the first transceiver negotiation module, and mode through consultation determines the generation rule and the second coded format and the second power of the first training sequence.The training sequence generation module of second transceiver generates the first training sequence under the control of the second transceiver negotiation module, according to the generation rule for the first training sequence negotiated in advance with the first transceiver.

After second transceiver determines the first training sequence, the first training sequence is modulated using the second coded format and the second power negotiated with the first transceiver.Second coded format is the corresponding coded format of sub-channels every in N number of subchannel, and the second power is the corresponding power of sub-channels every in N number of subchannel.In channel estimation state, in order to make the first transceiver carry out channel estimation to every sub-channels, it is therefore preferred that the corresponding power of any subchannel that the second power includes is not zero.

The first transceiver into channel estimation state receives the first training sequence that the second power of use that the second transceiver is sent is modulated by N number of subchannel, later, first transceiver carries out channel estimation according to the first training sequence, obtains channel estimation results；First transceiver optimizes the coded format and power of N number of subchannel according to channel estimation results, determines coded format and power after optimization after the optimization of N number of subchannel.And power after coded format after optimization and optimization is sent to the first transmitting-receiving Equipment, to achieve the purpose that optimize the coded format and power of every sub-channels, so that limited power application is improved the availability of frequency spectrum in the relatively better subchannel of performance.Wherein, coded format includes the corresponding coded format of every sub-channels after optimization, and power includes the corresponding power of every sub-channels after optimization.

Specifically, first transceiver is carried out according to the first training sequence after channel estimation, obtain channel estimation results, such as signal-to-noise ratio (the Signal Noise Ratio of all subchannels, abbreviation SNR), or the parameters such as channel state information measuring reference signals (English are as follows: Channel State Information Reference Signal, abbreviation are as follows: CSI-RS) of all subchannels.The sequence exported in conjunction with channel estimation results and channel estimation and channel compensation block, and DMT sub-carrier power/constellation distribution algorithm, determine the condition of every sub-channels, the parameter distributed before being taken in every sub-channels in all subchannels, for example coded format and power etc. optimize, power after determining coded format after optimizing and optimizing, so that limited power application is improved the availability of frequency spectrum in the relatively better subchannel of performance.

By taking Fig. 3 a as an example, it is specifically introduced.Fig. 3 a illustrates the corresponding relationship of the SNR measured in advance corresponding to subcarrier and power load, bit load, the SNR measured in advance, that is, passes through the obtained channel estimation results SNR of channel estimation.As shown in Figure 3a, as the SNR higher of subcarrier measured in advance, the corresponding power load of the subcarrier is larger, and corresponding bit load is also larger.Conversely, the corresponding power load of the subcarrier is smaller when the SNR of subcarrier measured in advance is lower, corresponding bit load is also smaller.That is, as the SNR higher of the subcarrier on certain sub-channels, the power of corresponding distribution is also answered larger in the subchannel, conversely, the power of corresponding distribution also should be smaller in the subchannel when the SNR of the subcarrier on certain sub-channels is lower.In conjunction with channel estimation results, so that limited power application is improved the availability of frequency spectrum in the relatively better subchannel of performance.

A kind of optional implementation, in channel estimation state, second transceiver sends the first training sequence, first transceiver carries out channel estimation according to the first training sequence, coded format and power after optimization are sent to after the first transceiver after being optimized, first transceiver also determines the third moment, the third moment is the initial time of channel estimation charging state, the information at third moment is sent to the second transceiver by the first transceiver, so that the second transceiver and the first transceiver enter channel estimation charging state at the third moment simultaneously.Preferably, the first transceiver also determines the first coded format, and by One coded format is sent to the first transceiver.Optionally embodiment is, first transceiver will be used to indicate the information at third moment, first coded format, and coded format and power after optimization are sent to the second transceiver in an information after the optimization, or first transceiver the first transceiver will be used to indicate to the information at third moment respectively by a plurality of information, first coded format, and coded format and power after optimization are sent to the second transceiver after the optimization, specifically, first transceiver will be used to indicate the information at third moment by the communication channel between the first transceiver negotiation module and the second transceiver negotiation module, first coded format, and the information such as coded format and power after optimization are sent to the second transceiver after the optimization.

In specific implementation, the third moment one be positioned at the second transceiver receive the first transceiver transmission optimization after coded format and optimization after power at the time of after.At the third moment, second transceiver and the first transceiver enter channel estimation charging state simultaneously, at this time, the algorithm that second transceiver can be generated according to the training sequence negotiated in advance with the first transceiver generates the second training sequence, and is modulated using the first coded format known to power after optimization and the first transceiver to the second training sequence.Optionally, the second training sequence can be identical as the first training sequence, can also be different, and the embodiment of the present invention is without limitation.First coded format known to first transceiver, specifically may include diversified forms, such as, first transceiver determines the first coded format, and the first coded format is sent to the second transceiver, at this point, the first coded format is known for the first transceiver；Alternatively, determining the first coded format by the mode of the first transceiver and the second transceiver through consultation, the first coded format is known for the first transceiver at this time；Alternatively, the information of the first coded format is sent to the second transceiver and the first transceiver by high-level signaling, so that the first transceiver obtains the first coded format；Or configure the first coded format in the first transceiver and the second transceiver by way of human configuration so that the first transceiver obtains the first coded format, the embodiment of the present invention to the mode of the first coded format known to the first transceiver without limitation.

The stage is filled the water in channel estimation, first transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent, and is demodulated according to the first coded format to modulated second training sequence.

It is illustrated in conjunction with Fig. 2, the first transceiver receives the first training sequence by ADC module 114 After column, the AGC module 115 of the first transceiver carries out gain control to the signal amplitude of the first training sequence received, and the AGC module output of the first transceiver corresponds to the AGC coefficient of the first training sequence.After first transceiver receives the second training sequence by ADC module 114, the AGC module 115 of the first transceiver carries out gain control to the signal amplitude of the second training sequence received, and exports the AGC coefficient for corresponding to the second training sequence.When receiving the first training sequence due to the first transceiver, it is tiling that the first training sequence, which modulates used power, i.e., power corresponding to any sub-channels is non-zero power.At this point, the loss of power of first training sequence in transmission process is larger, thus the first transceiver receive the first training sequence power it is smaller, at this point, the AGC coefficient corresponding to the first training sequence that AGC module 115 needs to export is larger.In channel estimation charging state, second transceiver is modulated the second training sequence using power after optimization, since the first transceiver receives the first training sequence, and after carrying out channel estimation, the specific distribution situation of power is most of power-sharing cloth in low-frequency range after the optimization determined according to the condition of every sub-channels, and the performance number in certain subchannels of high band is zero at this time.Second training sequence is lost smaller in transmission process, then the signal amplitude for the second training sequence that the first transceiver receives is larger, at this point, the AGC coefficient corresponding to the second training sequence that AGC module 115 needs to export is then smaller.At this time, first transceiver switches to channel estimation charging state from channel estimation state, first transceiver is from the first training sequence is received to when receiving the second training sequence, the AGC coefficient of the AGC module output of first transceiver reduces since the biggish value for corresponding to the first training sequence, converges to the value corresponding to second training sequence.Sequence after carrying out gain control is sent to T/R module 116 by the AGC module 115 of the first transceiver, later, carries out demodulation operation to the second training sequence, and export the second training sequence.

A kind of preferred embodiment is that the second transceiver and the first transceiver are after channel estimation charging state, at the first moment, while entering working condition, in working condition, the second transceiver starts to process the traffic sequence received.Traffic sequence is the sequence for the normal operation state that the second transceiver receives.A kind of preferred embodiment is that the second transceiver is modulated the traffic sequence received after the first moment using coded format after power after optimization and optimization；Wherein, first moment and second transceiver send the duration between the initial time of modulated second training sequence not less than convergence duration；The AGC module of a length of first transceiver is defeated when the convergence AGC coefficient out converges to the duration of the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence.That is, the first transceiver receives the second training sequence, until the AGC coefficient that the AGC module of first transceiver exports converges to the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence.

It is introduced in conjunction with Fig. 2, in channel estimation charging state, the first transceiver receives the second training sequence, and demodulation operation is carried out to the second training sequence and is specifically included:

The sequence inputting nonlinear equalization module 117 that T/R module 116 is exported, to carry out nonlinear equalization, the sequence obtained after nonlinear equalization is subjected to pre-demodulating operation later, and by the sequence inputting obtained after pre-demodulating operation to decoder module 122, so that decoder module 122 carries out corresponding operating.Wherein, pre-demodulating operation may include removing CP and FFT to the sequence that nonlinear equalization module 117 exports, carrying out channel equalization, channel estimation and channel compensation later.

The second training sequence for carrying out demodulation operation is input to parallel serial conversion module 125 and carries out parallel-serial conversion by the first transceiver, and exports the second training sequence through parallel-serial conversion.

Optionally embodiment is another kind, the signal that the AGC module 115 of first transceiver carries out after gain control is sent to T/R module 116, later, nonlinear equalization is carried out to the second training sequence not by nonlinear equalization module 117, but pre-demodulating operation directly is carried out to the sequence that T/R module 116 exports.The second training sequence for carrying out pre-demodulating operation is input to parallel serial conversion module 125 and carries out parallel-serial conversion by the first transceiver, and exports the second training sequence through parallel-serial conversion.

First transceiver is decoded the second training sequence using known first coded format, at this time in channel estimation charging state, the decoded error rate of first transceiver is almost nil, when the TR phase demodulation module 120 of the first transceiver is according to correct second training sequence progress TR phase demodulation is decoded at this time, noise is smaller, and a possibility that collapse substantially reduces.

After the second transceiver enters working condition, the second transceiver receives traffic sequence, is modulated using coded format after power after optimization and optimization to traffic sequence, and modulated traffic sequence is sent to the first transceiver.The AGC module output AGC coefficient of first transceiver carries out gain control to the signal amplitude of the traffic sequence received, since the second training sequence is modulated using power after optimization, traffic sequence be also by optimization after power be modulated, therefore, the first transceiver from Channel estimation charging state switches to working condition, and the AGC coefficient corresponding to the second training sequence of the AGC module output of the first transceiver is not much different with the AGC coefficient for corresponding to traffic sequence.That is, first transceiver switches to after working condition from channel estimation charging state, the AGC coefficient fluctuation of the AGC module output of first transceiver is little, when to make the first transceiver be decoded for traffic sequence, accuracy is higher, a possibility that and when further carrying out TR phase demodulation according to decoded traffic sequence, phase demodulation noise is smaller, TR collapse is also smaller.

For example, when first transceiver receives the first training sequence, it is tiling that first training sequence, which modulates used power, power corresponding to i.e. any sub-channels is non-zero power, therefore, the loss of power of first training sequence in transmission process is larger, therefore the first transceiver receive the first training sequence power it is smaller, when the general power of all subchannels is 10, the power for the first training sequence that then receiving end receives is 2, at this time, the AGC coefficient that the AGC module of first transceiver need to export is 2.5, at this time, first training sequence AGC module carries out after gain control, the power of the sequence of output is 2.5 multiplied by 2, as 5.

When the first transceiver receives the second training sequence, since the second training sequence is modulated using power after optimization, it is most of power-sharing cloth in low-frequency range further as the specific distribution situation of power after optimization, the performance number in certain subchannels of high band is zero at this time, therefore the second training sequence is lost smaller in transmission process, the power for the second training sequence that then the first transceiver receives is larger, at this time, the power that first transceiver receives the second training sequence is 8, at this time, the AGC coefficient that the AGC module of first transceiver need to export is 0.625, so, second training sequence is carried out through AGC module after gain control, the power of the sequence of output is 0.625 multiplied by 8, as 5.It can be seen that, when receiving the second training sequence, AGC coefficient needs to converge to 0.625 from 2.5, wherein, after receiving the second training sequence, the AGC coefficient of AGC module output is the AGC coefficient corresponding to the second training sequence, i.e., from 2.5 to 0.625 be the AGC coefficient corresponding to the second training sequence of AGC module output, and 0.625 is the minimum value in the value for correspond to the AGC coefficient of the second training sequence.The a certain moment when AGC coefficient converges to 0.625 or later is the first above-mentioned moment.Duration is restrained, i.e. an empirical value, such as several milliseconds usually can be used in duration between the first moment and third moment.

When receiving traffic sequence, the AGC module of the first transceiver output AGC coefficient is to receiving Traffic sequence carry out gain control, since the second training sequence is modulated using power after optimization, traffic sequence is also to be modulated by power after optimization, therefore, first transceiver switches to working condition from channel estimation charging state, and the AGC coefficient corresponding to the second training sequence of the AGC module output of the first transceiver is not much different with the AGC coefficient for corresponding to traffic sequence.The power for the traffic sequence that first transceiver receives is 8, at this point, the AGC coefficient that the AGC module of the first transceiver need to export is 0.625, so, after traffic sequence carries out gain control through AGC module, the power of the sequence of output is 0.625 multiplied by 8, as 5.As it can be seen that the first transceiver is from the second training sequence is received to traffic sequence is received, the AGC coefficient fluctuation of AGC module output is little.

It is visible by the above process, second transceiver and the first transceiver switch to channel estimation charging state from channel estimation state, working condition is switched to from channel estimation charging state later, the decoded accuracy of the first transceiver is higher in whole process, therefore, in whole process, when the first transceiver carries out TR phase demodulation, a possibility that phase demodulation noise is smaller, and TR collapses is also smaller.

Above method process is introduced to be clearer, the embodiment of the invention provides the flow diagrams of another data transmission method, as shown in Figure 4:

Step 401, the communication channel between the second transceiver negotiation module and the first transceiver negotiation module is successfully established, and executes step 402 later；

Step 402, the second transceiver negotiation module and the first transceiver negotiation module determine the second moment, the first moment and the first training sequence create-rule through consultation, execute step 403 later；

Step 403, the first transceiver requires the second transceiver to send the first training sequence, and sends the second coded format and the second power；Specifically, the first transceiver transmittable one is used to indicate the instruction information that the second transceiver sends the first training sequence, executes step 404 later；

Step 404, second transceiver receive the first transceiver transmission be used to indicate the second transceiver send the first training sequence instruction information after, second transceiver generates the first training sequence, and obtains the second coded format and the second power, executes step 405 later；

Step 405, the second transceiver enters channel estimation state at the second moment, is modulated using the second coded format and the second power to the first training sequence, and modulated First ray is sent to the first transceiver, executes step 406 later；

Step 406, the first transceiver receives the first training sequence, executes step 407 later；

Step 407, the first transceiver carries out channel estimation according to the first training sequence, executes step 408 later；

Step 408, the first transceiver combination DMT sub-carrier power/constellation distribution algorithm and channel estimation results determine coded format and power after optimization after optimization, execute step 409 later；

Step 409, coded format and power after optimization after the first transceiver sends optimization to the second transceiver；And the first coded format and third moment are sent to the second transceiver, step 410 is executed later；

Step 410, the second transceiver obtains after optimization power, the first coded format and third moment after coded format, optimization, executes step 411 later；

Step 411, the second transceiver enters channel estimation charging state at the third moment, is modulated using power after the first coded format and optimization to the second training, and modulated second training sequence is sent to the first transceiver, executes step 412 later；

Step 412, the first transceiver enters channel estimation charging state at the third moment, and the first transceiver receives the second training sequence, and is handled, and the first transceiver of output treated the second training sequence executes step 413 later；

Step 413, the second transceiver enters working condition at the first moment, is modulated using power after coded format after optimization and optimization to the traffic sequence received, and modulated traffic sequence is sent to the first transceiver, executes step 414 later；

Step 414, it receives and enters working condition at the first moment, the first transceiver receives traffic sequence, and is handled, the first transceiver of output treated traffic sequence.

Based on above content, the embodiment of the present invention provides a kind of preferred embodiment.Fig. 5 illustrates the applicable another system architecture schematic diagram of the embodiment of the present invention, as shown in Figure 5, increase non-linear sequence generation module 501, the estimation of 501 connecting channel of non-linear sequence generation module and channel compensation block 121 and nonlinear equalization coefficients calculation block 118 in system architecture shown in Fig. 1.

Based on system architecture shown in fig. 5, a kind of preferred embodiment provided in an embodiment of the present invention is, in channel estimation state, when the first transceiver receives the first training sequence, nonlinear equalization is carried out to the first training sequence received using the first nonlinear equalization coefficient.Wherein, the first nonlinear equalization system Number is determined according to the first training sequence and channel estimation results, and channel estimation results are the results that channel estimation is carried out according to the first training sequence.Preferably, first nonlinear equalization coefficient obtains in the following manner: the first training sequence is multiplied by the first transceiver with the channel estimation results on frequency domain, obtained structure is transformed into time domain by IFFT later, and adds CP to get non-linear sequence is arrived；First transceiver determines the first nonlinear equalization coefficient according to non-linear sequence.The some parameters for being able to reflect all sub-channel conditionals that channel estimation results can determine for the first transceiver, such as the SNR of every sub-channels.

In channel estimation charging state, when the first transceiver receives the second training sequence, nonlinear equalization is carried out to modulated second training sequence received using the first nonlinear equalization coefficient.First transceiver simultaneously carries out pre-demodulating operation to the sequence obtain after nonlinear equalization, and according to the first coded format, is decoded to the sequence obtain after pre-demodulating operation.

Based on system architecture shown in fig. 5, Fig. 6 illustrates the embodiment of the present invention and provides a kind of flow diagram of preference data transmission method, as shown in Figure 6:

Step 402, the second transceiver negotiation module and the first transceiver negotiation module negotiate the second moment, the first moment and the first training sequence create-rule, execute step 403 later；

Step 404, the second transceiver generates the first training sequence, and obtains the second coded format and the second power, executes step 405 later；

Step 407, the first transceiver carries out channel estimation according to the first training sequence, executes step later 601；

Step 601, the first transceiver generates non-linear sequence according to the first training sequence and channel estimation results；And the first nonlinear equalization coefficient is determined according to non-linear sequence, step 602 is executed later；

Step 602, nonlinear equalization is carried out to the first training sequence received using the first nonlinear equalization coefficient, and pre-demodulating operation is carried out to the sequence obtain after nonlinear equalization, and according to the second coded format, the sequence obtain after pre-demodulating operation is decoded, executes step 408 later；

Step 411, second transceiver enters channel estimation charging state at the third moment, is modulated using power after the first coded format and optimization to the second training, and modulated second training sequence is sent to the first transceiver, step 603 is executed later, executes step 603 later；

Step 603, enter channel estimation charging state at the third moment, first transceiver receives the second training sequence, nonlinear equalization is carried out to the second training sequence received using the first nonlinear equalization coefficient, and pre-demodulating operation is carried out to the sequence obtain after nonlinear equalization, and according to the second coded format, the sequence obtain after pre-demodulating operation is decoded, executes step 604 later；

Step 604, the first transceiver handles the second training sequence after carrying out nonlinear equalization, the first transceiver of output treated the second training sequence；Step 413 is executed later；

Due to switching to channel estimation when the second transceiver and the first transceiver from channel estimation state and infusing When water state, the AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, the signal amplitude corresponding to the first training sequence received further as the first transceiver is smaller, signal amplitude corresponding to the second training sequence is larger, therefore, AGC coefficient need to converge to lesser value from biggish value.At this point, the first transceiver generates non-linear sequence according to channel estimation state and the first training sequence, and determines the first nonlinear equalization coefficient according to non-linear sequence due in channel estimation state；Therefore, the first nonlinear equalization coefficient has reflected the physical condition of channel at this time, therefore, first transceiver can be in channel estimation charging state, nonlinear equalization directly is carried out to the second training sequence received using the first nonlinear equalization coefficient, and due to when switching to working condition from channel estimation state, the fluctuation of AGC coefficient is larger in AGC convergence process, therefore, new nonlinear equalization coefficient and actual channel condition is generated according to the second training sequence at this time to mismatch, it is easy error, based on this, nonlinear equalization is carried out to the second training sequence according to the first nonlinear equalization coefficient that channel estimation results are calculated using channel estimation state in the embodiment of the present invention, on the one hand it avoids AGC coefficient and fluctuates the problem of nonlinear factor calculated in biggish situation is easy error, on the other hand right well The second training sequence received has carried out nonlinear equalization.

A kind of optional embodiment, when the second transceiver and the first transceiver switch to working condition simultaneously, first transceiver is directed to the traffic sequence received, first transceiver continues the traffic sequence arrived according to real-time reception and calculates the corresponding nonlinear equalization coefficient of current business sequence, and nonlinear equalization is carried out using the corresponding nonlinear equalization coefficient of current business sequence, and a series of processing of sequence progress is obtained later to nonlinear equalization is carried out, the traffic sequence after output the first transceiver recovery.

Based on above content, the embodiment of the present invention provides another preferred embodiment.Fig. 7 illustrates the applicable another system architecture schematic diagram of the embodiment of the present invention, as shown in fig. 7, being based on system architecture shown in FIG. 1, deletes nonlinear equalization module 117 and nonlinear equalization coefficients calculation block 118 in system architecture shown in Fig. 7.

Based on system architecture shown in Fig. 7, a kind of preferred embodiment provided in an embodiment of the present invention is, in channel estimation state, first transceiver receives the first training sequence and is decoded, during the entire process of the first training sequence that the first transceiver of final output restores, the first transceiver does not carry out nonlinear equalization to the first training sequence.And in channel estimation charging state, the first transceiver receives Two training sequences are simultaneously decoded, and during the entire process of the second training sequence that the first transceiver of final output restores, the first transceiver does not carry out nonlinear equalization to the second training sequence.Optionally, in working condition, the first transceiver receives traffic sequence and is decoded, and during the entire process of the traffic sequence that the first transceiver of final output restores, the first transceiver does not carry out nonlinear equalization to traffic sequence.In this way, then can avoid when the first transceiver switches to channel estimation charging state from channel estimation state, AGC coefficient is fluctuated in biggish situation, and the first transceiver nonlinear factor calculated is easy the problem of malfunctioning,

Based on system architecture shown in Fig. 7, the embodiment of the present invention provides a kind of flow diagram of preference data transmission method, as shown in Figure 8:

Step 406, the first transceiver receives the first training sequence, executes step 801 later；

Step 801, the first transceiver carries out channel estimation according to the first training sequence, and exports the first transceiver treated the first training sequence, which does not carry out nonlinear equalization to the first training sequence；Step 408 is executed later；

Step 411, the second transceiver enters channel estimation charging state at the third moment, is modulated using power after the first coded format and optimization to the second training, and modulated second training sequence is sent to the first transceiver；Step 802 is executed later；

Step 802, enter channel estimation charging state at the third moment, the first transceiver receives the second training sequence, and is handled, the first transceiver is exported treated the second training sequence, which does not carry out nonlinear equalization to the second training sequence；Step 413 is executed later；

It can be seen from the above: in the embodiment of the present invention, first transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；First transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after first transceiver receives power after the use that the second transceiver is sent optimizes and optimizes；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.Since the first transceiver is after carrying out channel estimation according to the first training sequence, receive the second training sequence using algorithm for power modulation after the first coded format and optimization, at this point, the AGC coefficient that the AGC module of the first transceiver exports needs to converge to from the value for corresponding to the first training sequence corresponding to the second training sequence Value, during AGC coefficient is convergent, since known first coded format can be used to be decoded the second training sequence for the first transceiver, therefore, error rate when first transceiver is decoded for the second training sequence is almost nil, to which the first transceiver is during from the first training sequence of reception to the second training sequence of reception, first transceiver is lower using noise when decoded second training sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.When receiving traffic sequence further as the first transceiver, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to traffic sequence from the value for corresponding to the second training sequence, but since the second training sequence and traffic sequence are modulated using power after optimization, that is the value that the AGC coefficient of the AGC module of the first transceiver corresponds to the second training sequence is approached with the value for corresponding to traffic sequence, first transceiver is during from the second training sequence of reception to reception traffic sequence, the fluctuation of AGC coefficient is little, therefore, error rate is lower when first transceiver is decoded traffic sequence, in turn, noise is lower when first transceiver is for traffic sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.

Fig. 9 illustrates a kind of flow diagram of data transmission method provided in an embodiment of the present invention.

Based on same idea, present invention implementation provides a kind of data transmission method, as shown in Figure 9, comprising:

Step 901, coded format and power after optimization after the optimization that the first transceiver of the second transceiver reception is sent, wherein coded format and power after optimization are that the first transceiver is determined according to the first training sequence for being used to carry out channel estimation after optimization；

Step 902, second transceiver determines the second training sequence, the second training sequence is modulated using the first coded format known to power after optimization and the first transceiver, and modulated second training sequence is sent to the first transceiver, second training sequence is used to make the AGC module of the first transceiver that the AGC coefficient of output is converged to the value corresponding to the second training sequence from the value corresponding to the first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；

Step 903, second transceiver receives traffic sequence, traffic sequence is modulated using coded format after power after optimization and optimization, and modulated traffic sequence is sent to the first transceiver, traffic sequence is for training the AGC module of the first transceiver the AGC coefficient of output from corresponding to second The value of sequence converges to the value corresponding to traffic sequence.

Preferably, second transceiver is modulated the traffic sequence using coded format after power after the optimization and the optimization, comprising:

Second transceiver is modulated the traffic sequence received after the first moment using coded format after power after the optimization and the optimization；

Wherein, first moment and second transceiver send the duration between the initial time of modulated second training sequence not less than convergence duration；The AGC coefficient of the AGC module output of a length of first transceiver converges to the duration of the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence when convergence.

Preferably, second transceiver receives after the optimization that the first transceiver is sent after coded format and optimization before power, further includes:

Second transceiver determines first training sequence, and is modulated using the second power to first training sequence, and modulated first training sequence is sent to first transceiver by N number of subchannel；

Wherein, N is integer more than or equal to 1, and second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.

Preferably, power obtains in the following manner after coded format and the optimization after the optimization:

First transceiver carries out channel estimation according to first training sequence, obtains channel estimation results；

First transceiver optimizes the coded format and power of N number of subchannel according to the channel estimation results, determines the Optimized Coding Based format and the optimization power of N number of subchannel.

It can be seen from the above: in the embodiment of the present invention, first transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；First transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；The AGC coefficient of the AGC module output of first transceiver is trained from corresponding to first The value of sequence converges to the value corresponding to the second training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after first transceiver receives power after the use that the second transceiver is sent optimizes and optimizes；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.Since the first transceiver is after carrying out channel estimation according to the first training sequence, receive the second training sequence using algorithm for power modulation after the first coded format and optimization, at this time, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, during AGC coefficient is convergent, since known first coded format can be used to be decoded the second training sequence for the first transceiver, therefore, error rate when first transceiver is decoded for the second training sequence is almost nil, to which the first transceiver is during from the first training sequence of reception to the second training sequence of reception, first transceiver is lower using noise when decoded second training sequence progress TR phase demodulation, when receiving the second training sequence to reduce The risk of TR collapse.When receiving traffic sequence further as the first transceiver, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to traffic sequence from the value for corresponding to the second training sequence, but since the second training sequence and traffic sequence are modulated using power after optimization, that is the value that the AGC coefficient of the AGC module of the first transceiver corresponds to the second training sequence is approached with the value for corresponding to traffic sequence, first transceiver is during from the second training sequence of reception to reception traffic sequence, the fluctuation of AGC coefficient is little, therefore, error rate is lower when first transceiver is decoded traffic sequence, in turn, noise is lower when first transceiver is for traffic sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.

Figure 10 illustrates a kind of structural schematic diagram of first transceiver provided in an embodiment of the present invention.

Based on same idea, present invention implementation provides a kind of first transceiver, as shown in Figure 10, including receiving module 1001, processing module 1002, sending module 1003, demodulation module 1004, AGC module 1005, nonlinear equalization module 1006 and nonlinear equalization coefficients calculation block 1007:

Receiving module 1001, for receiving the first training sequence, the second transmitting-receiving of the transmission of the second transceiver The traffic sequence that coded format is modulated after power and optimization after the use optimization that the second training sequence and the second transceiver that the first coded format known to power and the first transceiver is modulated after the use optimization that equipment is sent are sent；

Processing module 1002, for carrying out channel estimation according to the first training sequence, coded format and power after optimization after the optimization determined；

Sending module 1003, for power after coded format after the optimization determined and optimization to be sent to the second transceiver；

Demodulation module 1004, for carrying out demodulation operation to modulated second training sequence according to the first coded format；

AGC module 1005, for when receiving module receives the second training sequence, the AGC coefficient of output to be converged to the value corresponding to the second training sequence from the value for corresponding to the first training sequence；When receiving module receives traffic sequence, the AGC coefficient of output is converged into the value corresponding to traffic sequence from the value for corresponding to the second training sequence.

Preferably, AGC module 1005, is specifically used for:

Preferably, receiving module 1001 are specifically used for:

The first training sequence that the second power of use that the second transceiver is sent is modulated is received by N number of subchannel；

Preferably, processing module 1002 are specifically used for:

Preferably, further include nonlinear equalization module 1006, be used for:

When receiving module receives the first training sequence, using the first nonlinear equalization coefficient to receiving The first training sequence carry out nonlinear equalization；Wherein, the first nonlinear equalization coefficient is determined according to the first training sequence and channel estimation results；

Demodulation module 1004, is specifically used for:

Preferably, further include nonlinear equalization coefficients calculation block 1007, be used for:

It can be seen from the above: in the embodiment of the present invention, first transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；First transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after first transceiver receives power after the use that the second transceiver is sent optimizes and optimizes；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.Since the first transceiver is after carrying out channel estimation according to the first training sequence, receive the second training sequence using algorithm for power modulation after the first coded format and optimization, at this time, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, during AGC coefficient is convergent, since known first coded format can be used to be decoded the second training sequence for the first transceiver, therefore, error rate when first transceiver is decoded for the second training sequence is almost nil, to which the first transceiver is during from the first training sequence of reception to the second training sequence of reception, first transceiver is lower using noise when decoded second training sequence progress TR phase demodulation, when receiving the second training sequence to reduce The risk of TR collapse.Further as When one transceiver receives traffic sequence, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to traffic sequence from the value for corresponding to the second training sequence, but since the second training sequence and traffic sequence are modulated using power after optimization, that is the value that the AGC coefficient of the AGC module of the first transceiver corresponds to the second training sequence is approached with the value for corresponding to traffic sequence, first transceiver is during from the second training sequence of reception to reception traffic sequence, the fluctuation of AGC coefficient is little, therefore, error rate is lower when first transceiver is decoded traffic sequence, in turn, noise is lower when first transceiver is for traffic sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.

Figure 11 illustrates a kind of structural schematic diagram of second transceiver provided in an embodiment of the present invention.

Based on same idea, present invention implementation provides a kind of second transceiver, as shown in figure 11, including receiving module 1101, modulation module 1102, sending module 1103:

Receiving module 1101, coded format and power and traffic sequence after optimization after the optimization for receiving the transmission of the first transceiver；Coded format and power after optimization are that the first transceiver is determined according to the first training sequence for carrying out channel estimation after wherein optimizing；

Modulation module 1102 is modulated the second training sequence using the first coded format known to power after optimization and the first transceiver for determining the second training sequence；Traffic sequence is modulated using coded format after power after optimization and optimization；

Modulated traffic sequence is sent to the first transceiver for modulated second training sequence to be sent to the first transceiver by sending module 1103；Second training sequence is used to make the automatic growth control AGC module of the first transceiver that the AGC coefficient of output is converged to the value corresponding to the second training sequence from the value corresponding to the first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；The value that traffic sequence is used to that the AGC module of the first transceiver to be made to converge to the AGC coefficient of output from the value for corresponding to the second training sequence corresponding to traffic sequence.

Preferably, modulation module 1102 are specifically used for:

Using coded format after power after optimization and optimization to the traffic sequence received after the first moment It is modulated；

Wherein, the first moment and the second transceiver send the duration between the initial time of modulated second training sequence not less than convergence duration；The AGC coefficient of the AGC module output of a length of first transceiver converges to the duration of the minimum value in the value for all corresponding to the second training sequence from the value for corresponding to the first training sequence when convergence.

Preferably, modulation module 1102 are also used to:

Sending module 1103, is also used to:

Modulated first training sequence is sent to the first transceiver by N number of subchannel；

Preferably, coded format and power after optimization obtain in the following manner after optimization:

Figure 12 illustrates the structural schematic diagram of another first transceiver provided in an embodiment of the present invention.

Based on same idea, present invention implementation provides a kind of first transceiver, as shown in figure 12, including receiver 1201, processor 1202 and transmitter 1206:

Receiver 1201, the traffic sequence that coded format is modulated after power and optimization after the use optimization that the second training sequence and the second transceiver that the first coded format known to power and the first transceiver is modulated for receiving the first training sequence of the second transceiver transmission under the control of processor 1202, after the use optimization that the second transceiver is sent are sent；

Transmitter 1206, for power after coded format after the optimization determined and optimization to be sent to the second transceiver under the control of processor 1202；

Processor 1202, for carrying out channel estimation according to the first training sequence, coded format and power after optimization after the optimization determined；Demodulation operation is carried out to modulated second training sequence according to the first coded format；For when receiver receives the second training sequence, by the automatic gain modules A GC system of output Number converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence；When receiver receives traffic sequence, the AGC coefficient of output is converged into the value corresponding to traffic sequence from the value for corresponding to the second training sequence；

Memory 1205, for storing data and information.

In Figure 12, bus architecture (is represented) with bus 1200, bus 1200 may include the bus and bridge of any number of interconnection, and bus 1200 will include the one or more processors represented by processor 1202 and the various circuits of memory that memory 1205 represents link together.Bus 1200 can also link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like, and these are all it is known in the art, and therefore, it will not be further described herein.Bus interface 1203 provides interface between bus 1200 and receiver 1201 and transmitter 1206.Receiver 1201 and transmitter 1206 can be an element, are also possible to multiple element, such as multiple receivers and transmitter, provide the module for communicating over a transmission medium with various other devices.The data handled through processor 1202 are transmitted on the radio medium by antenna 1204, and further, antenna 1204 also receives data and transfers data to processor 1202.

Processor 1202 is responsible for management bus 1200 and common processing, can also provide various functions, including timing, peripheral interface, voltage adjusting, power management and other control functions.And memory 1205 can be used for the used data when executing operation of storage processor 1202.

Optionally, processor 1202 can be centre and bury device (abbreviation CPU), specific integrated circuit (Application Specific Integrated Circuit, abbreviation ASIC), field programmable gate array (Field-Programmable Gate Array, abbreviation FPGA) or Complex Programmable Logic Devices (Complex Programmable Logic Device, abbreviation CPLD).

Preferably, processor 1202 are specifically used for:

Preferably, receiver 1201 are specifically used for:

Preferably, processor 1202 are specifically used for:

Preferably, processor 1202 are also used to:

It can be seen from the above: in the embodiment of the present invention, first transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；First transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after first transceiver receives power after the use that the second transceiver is sent optimizes and optimizes；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.Since the first transceiver is after carrying out channel estimation according to the first training sequence, receive using the first coding lattice Second training sequence of algorithm for power modulation after formula and optimization, at this time, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, during AGC coefficient is convergent, since known first coded format can be used to be decoded the second training sequence for the first transceiver, therefore, error rate when first transceiver is decoded for the second training sequence is almost nil, to which the first transceiver is during from the first training sequence of reception to the second training sequence of reception, first transceiver is lower using noise when decoded second training sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.When receiving traffic sequence further as the first transceiver, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to traffic sequence from the value for corresponding to the second training sequence, but since the second training sequence and traffic sequence are modulated using power after optimization, that is the value that the AGC coefficient of the AGC module of the first transceiver corresponds to the second training sequence is approached with the value for corresponding to traffic sequence, first transceiver is during from the second training sequence of reception to reception traffic sequence, the fluctuation of AGC coefficient is little, therefore, error rate is lower when first transceiver is decoded traffic sequence, in turn, noise is lower when first transceiver is for traffic sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.

Figure 13 illustrates a kind of structural schematic diagram of second transceiver provided in an embodiment of the present invention.

Based on same idea, present invention implementation provides a kind of second transceiver, as shown in figure 13, including receiver 1301, processor 1302 and transmitter 1306:

Receiver 1301, coded format and power and traffic sequence after optimization after the optimization for receiving the transmission of the first transceiver under the control of processor 1302；Coded format and power after optimization are that the first transceiver is determined according to the first training sequence for carrying out channel estimation after wherein optimizing；

Processor 1302 is modulated the second training sequence using the first coded format known to power after optimization and the first transceiver for determining the second training sequence；Traffic sequence is modulated using coded format after power after optimization and optimization；

Transmitter 1306, for sending modulated second training sequence under the control of processor 1302 To the first transceiver, modulated traffic sequence is sent to the first transceiver；Second training sequence is used to make the automatic growth control AGC module of the first transceiver that the AGC coefficient of output is converged to the value corresponding to the second training sequence from the value corresponding to the first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；The value that traffic sequence is used to that the AGC module of the first transceiver to be made to converge to the AGC coefficient of output from the value for corresponding to the second training sequence corresponding to traffic sequence；

Memory 1305, for storing data and information.

In Figure 13, bus architecture (is represented) with bus 1300, bus 1300 may include the bus and bridge of any number of interconnection, and bus 1300 will include the one or more processors represented by processor 1302 and the various circuits of memory that memory 1305 represents link together.Bus 1300 can also link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like, and these are all it is known in the art, and therefore, it will not be further described herein.Bus interface 1303 provides interface between bus 1300 and receiver 1301 and transmitter 1306.Receiver 1301 and transmitter 1306 can be an element, are also possible to multiple element, such as multiple receivers and transmitter, provide the module for communicating over a transmission medium with various other devices.The data handled through processor 1302 are transmitted on the radio medium by antenna 1304, and further, antenna 1304 also receives data and transfers data to processor 1302.

Processor 1302 is responsible for management bus 1300 and common processing, can also provide various functions, including timing, peripheral interface, voltage adjusting, power management and other control functions.And memory 1305 can be used for the used data when executing operation of storage processor 1302.

Optionally, processor 1302 can be CPU, ASIC, FPGA or CPLD.

Preferably, processor 1302 are specifically used for:

Wherein, the first moment and the second transceiver send the duration between the initial time of modulated second training sequence not less than convergence duration；The AGC coefficient of the AGC module output of a length of first transceiver converges in the value for all corresponding to the second training sequence from the value for corresponding to the first training sequence when convergence Minimum value duration.

Preferably, processor 1302 are also used to:

Transmitter 1306, is also used to:

It can be seen from the above: in the embodiment of the present invention, first transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；First transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after first transceiver receives power after the use that the second transceiver is sent optimizes and optimizes；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.Since the first transceiver is after carrying out channel estimation according to the first training sequence, receive the second training sequence using algorithm for power modulation after the first coded format and optimization, at this time, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, during AGC coefficient is convergent, since known first coded format can be used to be decoded the second training sequence for the first transceiver, therefore, error rate when first transceiver is decoded for the second training sequence is almost nil, to which the first transceiver is during from the first training sequence of reception to the second training sequence of reception, when first transceiver carries out TR phase demodulation using decoded second training sequence Noise is lower, to reduce the risk that TR collapses when receiving the second training sequence.When receiving traffic sequence further as the first transceiver, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to traffic sequence from the value for corresponding to the second training sequence, but since the second training sequence and traffic sequence are modulated using power after optimization, that is the value that the AGC coefficient of the AGC module of the first transceiver corresponds to the second training sequence is approached with the value for corresponding to traffic sequence, first transceiver is during from the second training sequence of reception to reception traffic sequence, the fluctuation of AGC coefficient is little, therefore, error rate is lower when first transceiver is decoded traffic sequence, in turn, noise is lower when first transceiver is for traffic sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.

Figure 14 illustrates a kind of structural schematic diagram of data transmission system provided in an embodiment of the present invention.

Based on same idea, present invention implementation provides a kind of data transmission system, as shown in figure 14, including the second transceiver 1401 and the first transceiver 1402:

Second transceiver 1401, coded format and power after optimization after the optimization for receiving the transmission of the first transceiver；It determines the second training sequence, the second training sequence is modulated using the first coded format known to power after optimization and the first transceiver, and modulated second training sequence is sent to the first transceiver；Second transceiver receives traffic sequence, is modulated using coded format after power after optimization and optimization to traffic sequence, and modulated traffic sequence is sent to the first transceiver；

Power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver for receiving the first training sequence of the second transceiver transmission by the first transceiver 1402；Receive the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization of the second transceiver transmission；The AGC coefficient of automatic growth control AGC module output converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after receiving power after the use that the second transceiver is sent optimizes and optimizing；The AGC coefficient of AGC module output converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.

It can be seen from the above: in the embodiment of the present invention, first transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to the first training sequence progress channel estimation and optimization is sent to the second transceiver；First transceiver receives the second training sequence that the first coded format known to power and the first transceiver is modulated after the use optimization that the second transceiver is sent；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, carries out demodulation operation to modulated second training sequence according to the first coded format；The traffic sequence that coded format is modulated after first transceiver receives power after the use that the second transceiver is sent optimizes and optimizes；The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to traffic sequence from the value for corresponding to the second training sequence.Since the first transceiver is after carrying out channel estimation according to the first training sequence, receive the second training sequence using algorithm for power modulation after the first coded format and optimization, at this time, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to the second training sequence from the value for corresponding to the first training sequence, during AGC coefficient is convergent, since known first coded format can be used to be decoded the second training sequence for the first transceiver, therefore, error rate when first transceiver is decoded for the second training sequence is almost nil, to which the first transceiver is during from the first training sequence of reception to the second training sequence of reception, first transceiver is lower using noise when decoded second training sequence progress TR phase demodulation, when receiving the second training sequence to reduce The risk of TR collapse.When receiving traffic sequence further as the first transceiver, the AGC coefficient of the AGC module output of first transceiver needs to converge to the value corresponding to traffic sequence from the value for corresponding to the second training sequence, but since the second training sequence and traffic sequence are modulated using power after optimization, that is the value that the AGC coefficient of the AGC module of the first transceiver corresponds to the second training sequence is approached with the value for corresponding to traffic sequence, first transceiver is during from the second training sequence of reception to reception traffic sequence, the fluctuation of AGC coefficient is little, therefore, error rate is lower when first transceiver is decoded traffic sequence, in turn, noise is lower when first transceiver is for traffic sequence progress TR phase demodulation, to reduce the risk that TR collapses when receiving the second training sequence.

It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method or computer program product.Therefore, the present invention can be used complete hardware embodiment, complete software embodiment or combine The form of embodiment in terms of software and hardware.Moreover, the form for the computer program product implemented in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) that one or more wherein includes computer usable program code can be used in the present invention.

The present invention be referring to according to the method for the embodiment of the present invention, the flowchart and/or the block diagram of equipment (system) and computer program product describes.It should be understood that the combination of process and/or box in each flow and/or block and flowchart and/or the block diagram that can be realized by computer program instructions in flowchart and/or the block diagram.These computer program instructions be can provide to the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to generate a machine, so that generating by the instruction that computer or the processor of other programmable data processing devices execute for realizing the device for the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions, which may also be stored in, to be able to guide in computer or other programmable data processing devices computer-readable memory operate in a specific manner, so that instruction stored in the computer readable memory generates the manufacture including command device, which realizes the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that series of operation steps are executed on a computer or other programmable device to generate computer implemented processing, thus the step of instruction executed on a computer or other programmable device is provided for realizing the function of specifying in one or more flows of the flowchart and/or one or more blocks of the block diagram.

Although preferred embodiments of the present invention have been described, once a person skilled in the art knows basic creative concepts, then additional changes and modifications may be made to these embodiments.So it includes preferred embodiment and all change and modification for falling into the scope of the invention that the following claims are intended to be interpreted as.

Obviously, those skilled in the art various changes and modifications can be made to the invention without departing from the spirit and scope of the present invention.If then the present invention is also intended to include these modifications and variations in this way, these modifications and changes of the present invention is within the scope of the claims of the present invention and its equivalent technology.

Claims

A kind of data transmission method characterized by comprising

First transceiver receives the first training sequence that the second transceiver is sent, and power after coded format after the optimization determined according to first training sequence progress channel estimation and optimization is sent to second transceiver；

First transceiver receives optimize described in the use that second transceiver is sent after the second training sequence for being modulated of the first coded format known to power and first transceiver；

The AGC coefficient of the automatic growth control AGC module output of first transceiver converges to the value corresponding to second training sequence from the value for corresponding to first training sequence, carries out demodulation operation to modulated second training sequence according to first coded format；

First transceiver receives optimize described in the use that second transceiver is sent after coded format is modulated after power and the optimization traffic sequence；

The AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to the traffic sequence from the value for corresponding to second training sequence.
The method as described in claim 1, which is characterized in that the AGC coefficient of the AGC module output of first transceiver converges to the value corresponding to second training sequence from the value for corresponding to first training sequence, specifically includes:

The AGC coefficient of the AGC module output of first transceiver converges to the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence.
It is method according to claim 1 or 2, which is characterized in that first transceiver receives the first training sequence that the second transceiver is sent, comprising:

First transceiver receives first training sequence that the second power of use that second transceiver is sent is modulated by N number of subchannel；

Wherein, N is the integer more than or equal to 1；Second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.
Method as claimed in claim 3, which is characterized in that first transceiver receives second After the first training sequence that transceiver is sent, before reception second training sequence, further includes:

First transceiver carries out channel estimation according to first training sequence, obtains channel estimation results；

First transceiver optimizes the coded format and power of N number of subchannel according to the channel estimation results, determines after the optimization of N number of subchannel power after coded format and the optimization.
Method as described in Claims 1-4 any claim, which is characterized in that after first transceiver receives the first training sequence, before reception second training sequence, further includes:

First transceiver carries out nonlinear equalization to first training sequence received using the first nonlinear equalization coefficient；Wherein, the first nonlinear equalization coefficient is determined according to first training sequence and the channel estimation results；

First transceiver carries out demodulation operation to modulated second training sequence according to first coded format, comprising:

First transceiver carries out nonlinear equalization to modulated second training sequence received using the first nonlinear equalization coefficient；

First transceiver carries out pre-demodulating operation to the sequence obtain after nonlinear equalization, and according to first coded format, is decoded to the sequence obtain after pre-demodulating operation.
Method as claimed in claim 5, which is characterized in that the first nonlinear equalization coefficient obtains in the following manner:

First training sequence is multiplied by first transceiver with the channel estimation results, obtains non-linear sequence；

First transceiver determines the first nonlinear equalization coefficient according to the non-linear sequence.
A kind of data transmission method characterized by comprising

Second transceiver receives after the optimization that the first transceiver is sent power after coded format and optimization, wherein power is that first transceiver is determining according to the first training sequence for carrying out channel estimation after coded format and the optimization after the optimization；

Second transceiver determines the second training sequence, uses power after the optimization and described first First coded format known to transceiver is modulated second training sequence, and modulated second training sequence is sent to first transceiver, second training sequence is used to make the automatic growth control AGC module of first transceiver that the AGC coefficient of output is converged to the value corresponding to second training sequence from the value corresponding to first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；

Second transceiver receives traffic sequence, the traffic sequence is modulated using coded format after power after the optimization and the optimization, and the modulated traffic sequence is sent to first transceiver, the value that the traffic sequence is used to that the AGC module of first transceiver to be made to converge to the AGC coefficient of output from the value for corresponding to second training sequence corresponding to the traffic sequence.
The method of claim 7, which is characterized in that second transceiver is modulated the traffic sequence using coded format after power after the optimization and the optimization, comprising:

Second transceiver is modulated the traffic sequence received after the first moment using coded format after power after the optimization and the optimization；

Wherein, first moment and second transceiver send the duration between the initial time of modulated second training sequence not less than convergence duration；The AGC coefficient of the AGC module output of a length of first transceiver converges to the duration of the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence when convergence.
Method as claimed in claim 7 or 8, which is characterized in that second transceiver receives after the optimization that the first transceiver is sent after coded format and optimization before power, further includes:

Second transceiver determines first training sequence, and is modulated using the second power to first training sequence, and modulated first training sequence is sent to first transceiver by N number of subchannel；

Wherein, N is integer more than or equal to 1, and second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.
Method as claimed in claim 9, which is characterized in that power obtains in the following manner after coded format and the optimization after the optimization:

First transceiver carries out channel estimation according to first training sequence, obtains channel estimation results；

First transceiver optimizes the coded format and power of N number of subchannel according to the channel estimation results, determines the Optimized Coding Based format and the optimization power of N number of subchannel.
A kind of transceiver characterized by comprising

Receiving module, for receive optimize described in the first training sequence of another transceiver transmission, the use that another described transceiver is sent after optimize described in the use that sends of the second training sequence for being modulated of the first coded format known to power and transceiver and another described transceiver after coded format is modulated after power and the optimization traffic sequence；

Processing module, for carrying out channel estimation according to first training sequence, coded format and power after optimization after the optimization determined；

Sending module, for power after coded format after the optimization determined and the optimization to be sent to another described transceiver；

Demodulation module, for carrying out demodulation operation to modulated second training sequence according to first coded format；

Automatic gain modules A GC module, for when the receiving module receives second training sequence, the AGC coefficient of output to be converged to the value corresponding to second training sequence from the value for corresponding to first training sequence；When the receiving module receives the traffic sequence, the AGC coefficient of output is converged into the value corresponding to the traffic sequence from the value for corresponding to second training sequence.
Transceiver as claimed in claim 11, which is characterized in that the AGC module is specifically used for:

When the receiving module receives second training sequence, the AGC coefficient of output is converged into the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence.
Transceiver as described in claim 11 or 12, which is characterized in that the receiving module is specifically used for:

First training sequence that the second power of use that another described transceiver is sent is modulated is received by N number of subchannel；

Wherein, N is the integer more than or equal to 1；Second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.
Transceiver as claimed in claim 13, which is characterized in that the processing module is specifically used for:

Channel estimation is carried out according to first training sequence, obtains channel estimation results；

According to the channel estimation results, the coded format and power of N number of subchannel are optimized, determine after the optimization of N number of subchannel power after coded format and the optimization.
Transceiver as described in claim 11 to 14 any claim, which is characterized in that further include nonlinear equalization module, be used for:

When the receiving module receives first training sequence, nonlinear equalization is carried out to first training sequence received using the first nonlinear equalization coefficient；Wherein, the first nonlinear equalization coefficient is determined according to first training sequence and the channel estimation results；

When the receiving module receives second training sequence, nonlinear equalization is carried out to modulated second training sequence received using the first nonlinear equalization coefficient；

The demodulation module, is specifically used for:

Pre-demodulating operation is carried out to the sequence obtain after nonlinear equalization, and according to first coded format, the sequence obtain after pre-demodulating operation is decoded.
Transceiver as claimed in claim 15, which is characterized in that further include nonlinear equalization coefficients calculation block, be used for:

First training sequence is multiplied with the channel estimation results, obtains non-linear sequence；

The first nonlinear equalization coefficient is determined according to the non-linear sequence.
A kind of transceiver characterized by comprising

Receiving module, coded format and power and traffic sequence after optimization after the optimization for receiving the transmission of another transceiver；Wherein power is that another described transceiver is determined according to the first training sequence for carrying out channel estimation after coded format and the optimization after the optimization；

Modulation module is modulated second training sequence using the first coded format known to power after the optimization and another described transceiver for determining the second training sequence；The traffic sequence is modulated using coded format after power after the optimization and the optimization；

The modulated traffic sequence is sent to another described transceiver for modulated second training sequence to be sent to another described transceiver by sending module；Second training sequence is used to make the automatic growth control AGC module of another transceiver that the AGC coefficient of output is converged to the value corresponding to second training sequence from the value corresponding to first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；The value that the traffic sequence is used to that the AGC module of another transceiver to be made to converge to the AGC coefficient of output from the value for corresponding to second training sequence corresponding to the traffic sequence.
Transceiver as claimed in claim 17, which is characterized in that the modulation module is specifically used for:

The traffic sequence received is modulated after the first moment using coded format after power after the optimization and the optimization；

Wherein, first moment and the transceiver send the duration between the initial time of modulated second training sequence not less than convergence duration；The AGC coefficient of the AGC module output of a length of another transceiver converges to the duration of the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence when convergence.
Transceiver as described in claim 17 or 18, which is characterized in that the modulation module is also used to:

It determines first training sequence, and first training sequence is modulated using the second power；

The sending module, is also used to:

Modulated first training sequence is sent to another described transceiver by N number of subchannel；

Wherein, N is integer more than or equal to 1, and second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.
Transceiver as claimed in claim 19, which is characterized in that coded format after the optimization It is obtained in the following manner with power after the optimization:

Another described transceiver carries out channel estimation according to first training sequence, obtains channel estimation results；

Another described transceiver optimizes the coded format and power of N number of subchannel according to the channel estimation results, determines the Optimized Coding Based format and the optimization power of N number of subchannel.
A kind of transceiver characterized by comprising

Receiver, for receive optimize described in the first training sequence of another transceiver transmission, the use that another described transceiver is sent after optimize described in the use that sends of the second training sequence for being modulated of the first coded format known to power and the transceiver and another described transceiver after coded format is modulated after power and the optimization traffic sequence；

Transmitter, for power after coded format after the optimization determined and the optimization to be sent to another described transceiver；

Processor, for carrying out channel estimation according to first training sequence, coded format and power after optimization after the optimization determined；Demodulation operation is carried out to modulated second training sequence according to first coded format；For when the receiver receives second training sequence, the automatic gain modules A GC coefficient of output to be converged to the value corresponding to second training sequence from the value for corresponding to first training sequence；When the receiver receives the traffic sequence, the AGC coefficient of output is converged into the value corresponding to the traffic sequence from the value for corresponding to second training sequence.
Transceiver as claimed in claim 21, which is characterized in that the processor is specifically used for:

When the receiver receives second training sequence, the AGC coefficient of output is converged into the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence.
Transceiver as described in claim 21 or 22, which is characterized in that the receiver is specifically used for:

The second power of use that another described transceiver is sent is received by N number of subchannel to be modulated First training sequence；

Wherein, N is the integer more than or equal to 1；Second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.
Transceiver as claimed in claim 23, which is characterized in that the processor is specifically used for:

Channel estimation is carried out according to first training sequence, obtains channel estimation results；

According to the channel estimation results, the coded format and power of N number of subchannel are optimized, determine after the optimization of N number of subchannel power after coded format and the optimization.
Transceiver as described in claim 21 to 24 any claim, which is characterized in that the processor is also used to:

When the receiver receives first training sequence, nonlinear equalization is carried out to first training sequence received using the first nonlinear equalization coefficient；Wherein, the first nonlinear equalization coefficient is determined according to first training sequence and the channel estimation results；

When the receiver receives second training sequence, nonlinear equalization is carried out to modulated second training sequence received using the first nonlinear equalization coefficient；

Pre-demodulating operation is carried out to the sequence obtain after nonlinear equalization, and according to first coded format, the sequence obtain after pre-demodulating operation is decoded.
Transceiver as claimed in claim 25, which is characterized in that the processor is also used to:

First training sequence is multiplied with the channel estimation results, obtains non-linear sequence；

The first nonlinear equalization coefficient is determined according to the non-linear sequence.
A kind of transceiver characterized by comprising

Receiver, coded format and power and traffic sequence after optimization after the optimization for receiving the transmission of another transceiver；Wherein power is that another described transceiver is determined according to the first training sequence for carrying out channel estimation after coded format and the optimization after the optimization；

Processor is modulated second training sequence using the first coded format known to power after the optimization and another described transceiver for determining the second training sequence；The traffic sequence is modulated using coded format after power after the optimization and the optimization；

The modulated traffic sequence is sent to another described transceiver for modulated second training sequence to be sent to another described transceiver by transmitter；Second training sequence is used to make the automatic growth control AGC module of another transceiver that the AGC coefficient of output is converged to the value corresponding to second training sequence from the value corresponding to first training sequence, and carries out demodulation operation to modulated second training sequence according to known first coded format；The value that the traffic sequence is used to that the AGC module of another transceiver to be made to converge to the AGC coefficient of output from the value for corresponding to second training sequence corresponding to the traffic sequence.
Transceiver as claimed in claim 27, which is characterized in that the processor is specifically used for:

The traffic sequence received is modulated after the first moment using coded format after power after the optimization and the optimization；

Wherein, first moment and the transceiver send the duration between the initial time of modulated second training sequence not less than convergence duration；The AGC coefficient of the AGC module output of a length of another transceiver converges to the duration of the minimum value in the value for all corresponding to second training sequence from the value for corresponding to first training sequence when convergence.
Transceiver as described in claim 27 or 28, which is characterized in that the processor is also used to:

It determines first training sequence, and first training sequence is modulated using the second power；

The transmitter, is also used to:

Modulated first training sequence is sent to another described transceiver by N number of subchannel；

Wherein, N is integer more than or equal to 1, and second power includes the corresponding power of every sub-channels in N number of subchannel, and the corresponding power of any subchannel is not zero.
Transceiver as claimed in claim 29, which is characterized in that power obtains in the following manner after coded format and the optimization after the optimization:

Another described transceiver carries out channel estimation according to first training sequence, obtains channel estimation results；

Another described transceiver optimizes the coded format and power of N number of subchannel according to the channel estimation results, determines the Optimized Coding Based format and the optimization power of N number of subchannel.
A kind of data transmission system characterized by comprising

Power after coded format after the optimization determined according to first training sequence progress channel estimation and optimization is sent to second transceiver for receiving the first training sequence of the second transceiver transmission by the first transceiver；Receive the second training sequence that the first coded format known to power and first transceiver is modulated after optimizing described in the use that second transceiver is sent；The AGC coefficient of automatic growth control AGC module output converges to the value corresponding to second training sequence from the value for corresponding to first training sequence, carries out demodulation operation to modulated second training sequence according to first coded format；Receive the traffic sequence that coded format is modulated after power and the optimization after optimizing described in the use that second transceiver is sent；The AGC coefficient of the AGC module output converges to the value corresponding to the traffic sequence from the value for corresponding to second training sequence；

Second transceiver, coded format and power after optimization after the optimization for receiving the transmission of the first transceiver；It determines the second training sequence, second training sequence is modulated using the first coded format known to power after the optimization and first transceiver, and modulated second training sequence is sent to first transceiver；Second transceiver receives traffic sequence, is modulated using coded format after power after the optimization and the optimization to the traffic sequence, and the modulated traffic sequence is sent to first transceiver.