WO2018072104A1

WO2018072104A1 - Transmitter, receiver and data transmission method

Info

Publication number: WO2018072104A1
Application number: PCT/CN2016/102472
Authority: WO
Inventors: 黄远达; 王勰; 李良川
Original assignee: 华为技术有限公司
Priority date: 2016-10-18
Filing date: 2016-10-18
Publication date: 2018-04-26
Also published as: CN109792420A; CN109792420B

Abstract

Provided in an embodiment of the present invention are a transmitter, a receiver, and a data transmission method. The transmitter of the present invention comprises: a time-frequency conversion module for performing time-frequency conversion on an original spreading code to obtain an original spreading code in a frequency domain; a frequency domain cyclic prefix insertion module for inserting a frequency domain cyclic prefix into the original spreading code in the frequency domain to obtain a first spreading code in the frequency domain; a frequency-time conversion module for performing frequency-time conversion on the first spreading code in the frequency domain to obtain a first spreading code in a time domain; and an output module for obtaining an output signal according to the first spreading code in the time domain and a baseband digital signal, and sending the output signal to the receiver. The embodiment of the present invention can realize compensating a relative frequency offset of multiple users and can effectively solve the problem of multiple access interference among multiple users.

Description

Transmitter, receiver and data transmission method

Technical field

Embodiments of the present invention relate to communication technologies, and in particular, to a transmitter, a receiver, and a data transmission method.

Background technique

Code Division Multiple Access (CDMA) is a multi-point-to-point communication technology developed on spread spectrum communication technology. The principle of CDMA technology is based on spread spectrum technology, which is to transmit a certain signal bandwidth information data, and is modulated by a high-speed spreading code whose bandwidth is much larger than the signal bandwidth, so that the bandwidth of the original data signal is expanded, and then modulated by carrier. Send it out. The receiving end uses the same spreading code to process the received wideband signal, and converts the wideband signal into a narrowband signal of the original data signal, that is, despreading, to realize information communication.

The above formula (1) describes the ideal autocorrelation property and cross-correlation of the spreading code of the direct sequence spread spectrum CDMA system. The self-correlation of the spreading code with itself is large, and the cross-correlation with other spreading codes is zero. In reality, the cross-correlation will not be zero due to other performance characteristics, but it is still very small compared to autocorrelation.

A good spreading code that satisfies the condition in the time domain must also have good autocorrelation and cross-correlation properties in the frequency domain:

The above formula (2) is an ideal autocorrelation and cross-correlation property of the spreading code in the frequency domain under ideal conditions. In reality, the cross-correlation will not be zero due to other performance characteristics, but it is still very small compared to autocorrelation. Good autocorrelation and cross-correlation properties ensure that multi-user signals in CDMA systems are orthogonal to each other and avoid multiple access interference.

However, in the fiber link, due to different factors in the transmission process, the original orthogonal The multi-user signals cause interference with each other, that is, the problem of multiple-access crosstalk.

Summary of the invention

Embodiments of the present invention provide a transmitter, a receiver, and a data transmission method to solve the problem that multi-user signals generate interference with each other.

In a first aspect, an embodiment of the present invention provides a transmitter, including:

a spreading code generator for generating an original spreading code;

a time-frequency conversion module, configured to perform time-frequency conversion on the original spreading code to obtain an original spreading code in the frequency domain;

a frequency domain cyclic prefix insertion module, configured to insert a frequency domain cyclic prefix into an original spreading code in a frequency domain, to obtain a first spreading code in a frequency domain;

a frequency-time conversion module, configured to perform frequency-time conversion on a first spreading code in a frequency domain, and acquire a first spreading code in a time domain;

And an output module, configured to obtain an output signal according to the first spreading code and the baseband digital signal in the time domain, and send the output signal to the receiver.

The transmitter provided in this implementation manner can utilize a frequency domain cyclic prefix to compensate for multi-user relative frequency offset, thereby effectively reducing multiple-site crosstalk between multiple users.

With reference to the first aspect, in a possible implementation manner of the first aspect, the output module includes a multiplier, a digital-to-analog conversion module, and a modulator;

The multiplier is configured to multiply the first spreading code of the time domain and the baseband digital signal to obtain a first to-be-output signal;

The digital-to-analog conversion module is configured to perform digital-to-analog conversion on the first to-be-output signal to obtain a first analog signal;

The modulator is configured to modulate the first analog signal, acquire the output signal, and send the output signal to a receiver.

In conjunction with the first aspect, and a possible implementation manner of the foregoing first aspect, in another possible implementation manner of the first aspect, the output module includes a time domain cyclic prefix insertion module, a multiplier, and a digital-to-analog conversion module. And modulator

The time domain cyclic prefix insertion module is configured to insert a time domain cyclic prefix into a first spreading code of the time domain, and acquire a second spreading code in a time domain;

The multiplier is configured to multiply the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal;

The digital-to-analog conversion module is configured to perform digital-to-analog conversion on the second to-be-output signal to obtain a second analog signal;

The modulator is configured to modulate the second analog signal, acquire the output signal, and send the output signal to a receiver.

The transmitter provided in this implementation manner can utilize the frequency domain cyclic prefix and the time domain cyclic prefix to compensate for the relative frequency offset of multiple users, thereby effectively reducing multiple access crosstalk between multiple users.

In a second aspect, an embodiment of the present invention provides a transmitter, including:

a spreading code generator for generating an original spreading code;

a time domain cyclic prefix insertion module, configured to insert a time domain cyclic prefix into the original spreading code to obtain a first spreading code in a time domain;

And an output module, configured to acquire an output signal according to the first spreading code and the baseband digital signal in the time domain, and send the output signal to the receiver.

The transmitter provided in this implementation manner can utilize the time domain cyclic prefix to compensate for the relative frequency offset of multiple users, thereby effectively reducing multiple access crosstalk between multiple users.

With reference to the second aspect, in a possible implementation manner of the second aspect, the output module includes a multiplier, a digital-to-analog conversion module, and a modulator;

With reference to the second aspect, and a possible implementation manner of the foregoing second aspect, in another possible implementation manner of the second aspect, the output module includes a time-frequency conversion module, a frequency domain cyclic prefix insertion module, and a frequency Conversion module, multiplier, digital to analog conversion module and modulator;

The time-frequency conversion module is configured to perform time-frequency conversion on the first spreading code of the time domain to obtain a first spreading code in a frequency domain;

The frequency domain cyclic prefix insertion module is configured to insert a frequency domain cyclic prefix into the first frequency domain In the spreading code, acquiring a second spreading code in the frequency domain;

The frequency-time conversion module is configured to perform frequency-time conversion on the second spreading code in the frequency domain to obtain a second spreading code in the time domain;

In a third aspect, an embodiment of the present invention provides a receiver, including:

a receiving module, configured to receive an output signal sent by the transmitter;

a cyclic prefix removal module, configured to remove a frequency domain cyclic prefix in the output signal, to obtain a first to-be-processed signal;

And a processing module, configured to acquire recovery data according to the first to-be-processed signal.

With reference to the third aspect, in a possible implementation manner of the third aspect, the cyclic prefix removal module includes a frequency domain cyclic prefix removal module;

The frequency domain cyclic prefix removal module is configured to perform time-frequency conversion on the output signal, obtain a frequency domain signal, determine a frequency domain synchronization range according to the frequency domain signal, and remove the frequency domain cyclic prefix according to the frequency domain synchronization range. Obtaining a valid frequency domain signal, and performing frequency-time conversion on the valid frequency domain signal to obtain a first to-be-processed signal.

With reference to the third aspect, and a possible implementation manner of the foregoing third aspect, in another possible implementation manner of the foregoing aspect, the frequency domain cyclic prefix removal module includes a time-frequency conversion module and a frequency domain cyclic prefix removal. Submodule, frequency conversion module and frequency domain synchronization module;

The time-frequency conversion module is configured to perform time-frequency conversion on the output signal to obtain a frequency domain signal;

The frequency domain synchronization module is configured to determine a frequency domain synchronization range according to the frequency domain signal, and send the frequency domain synchronization range to the frequency domain cyclic prefix removal submodule;

The frequency domain cyclic prefix removal submodule, configured to remove the frequency according to the frequency domain synchronization range A frequency domain cyclic prefix in the domain signal to obtain a valid frequency domain signal;

The frequency-time conversion module is configured to perform frequency-time conversion on the valid frequency domain signal to obtain a first to-be-processed signal;

With reference to the third aspect, and a possible implementation manner of the foregoing third aspect, in another possible implementation manner of the third aspect, the cyclic prefix removal module includes a frequency domain cyclic prefix removal module;

The frequency domain cyclic prefix removal module is configured to determine a frequency domain synchronization range according to the output signal, and set a band pass filter according to the frequency domain synchronization range to remove the frequency domain cyclic prefix to obtain a first to-be-processed signal.

With reference to the third aspect, and a possible implementation manner of the foregoing third aspect, in another possible implementation manner of the third aspect, the frequency domain cyclic prefix removal module includes a frequency domain synchronization module and a band pass filtering module;

The frequency domain synchronization module is configured to determine a frequency domain synchronization range according to the output signal, and send the frequency domain synchronization range to the band pass filtering module;

The band pass filtering module is configured to set a band pass filter according to the frequency domain synchronization range to remove the frequency domain cyclic prefix, and obtain a first to-be-processed signal.

With reference to the third aspect, and a possible implementation manner of the foregoing third aspect, in another possible implementation manner of the third aspect, the processing module includes a time domain cyclic prefix removal module and a despreading module;

The time domain cyclic prefix removal module is configured to determine a time domain synchronization position according to the first to-be-processed signal, and remove a time domain cyclic prefix in the first to-be-processed signal according to the time domain synchronization position, to obtain a second Signal to be processed;

The despreading module is configured to despread the second to-be-processed signal by using an original spreading code to obtain recovery data.

In conjunction with the third aspect, and a possible implementation manner of the foregoing third aspect, in another possible implementation manner of the third aspect, the time domain cyclic prefix removal module includes a timing synchronization module and a time domain cyclic prefix remover. Module

The timing synchronization module is configured to determine a time domain synchronization location according to the first to-be-processed signal, and send the time domain synchronization location to the time domain cyclic prefix removal sub-module;

The time domain cyclic prefix removal submodule, configured to remove the first to wait according to a time domain synchronization location Processing the time domain cyclic prefix in the signal to obtain the second pending signal.

In a fourth aspect, an embodiment of the present invention provides a receiver, including:

a cyclic prefix removal module, configured to remove a time domain cyclic prefix in the output signal, to obtain a first to-be-processed signal;

With reference to the fourth aspect, in a possible implementation manner of the fourth aspect, the cyclic prefix removal module includes a time domain cyclic prefix removal module;

The time domain cyclic prefix removal module is configured to determine a time domain synchronization position according to the output signal, remove the time domain cyclic prefix according to the time domain synchronization position, and obtain and acquire a first to-be-processed signal.

With reference to the fourth aspect, and a possible implementation manner of the foregoing fourth aspect, in another possible implementation manner of the fourth aspect, the processing module includes a frequency domain cyclic prefix removal module and a despreading module;

The frequency domain cyclic prefix removal module is configured to convert the first to-be-processed signal into a frequency domain signal, and remove a frequency domain cyclic prefix in the frequency domain signal, obtain a valid frequency domain signal, and The effective frequency domain signal is converted into a second to-be-processed signal;

The despreading module is configured to acquire recovery data according to the second to-be-processed module.

In conjunction with the fourth aspect, and a possible implementation manner of the foregoing fourth aspect, in another possible implementation manner of the foregoing aspect, the frequency domain cyclic prefix removal module includes a time-frequency conversion module and a frequency domain cyclic prefix removal. Submodule, frequency conversion module and frequency domain synchronization module;

The time-frequency conversion module is configured to perform time-frequency conversion on the first to-be-processed signal to obtain a frequency domain signal;

The frequency domain cyclic prefix removal submodule is configured to remove a frequency domain cyclic prefix in the frequency domain signal according to the frequency domain synchronization range, to obtain an effective frequency domain signal;

The frequency-time conversion module is configured to perform frequency-time conversion on the valid frequency domain signal to obtain a second to-be-processed signal.

With reference to the fourth aspect and a possible implementation manner of the foregoing fourth aspect, in the fourth aspect In another possible implementation manner, the frequency domain cyclic prefix removal module includes a frequency domain synchronization module and a band pass filtering module;

The frequency domain synchronization module is configured to determine a frequency domain synchronization range according to the first to-be-processed signal, and send the frequency domain synchronization range to the band pass filtering module;

The band pass filtering module is configured to set a band pass filter according to the frequency domain synchronization range to remove the frequency domain cyclic prefix in the first to-be-processed signal, and acquire a second to-be-processed signal.

In a fifth aspect, an embodiment of the present invention provides a data transmission method, including:

The transmitter performs time-frequency conversion on the original spreading code to obtain the original spreading code in the frequency domain;

Transmitting, by the transmitter, a frequency domain cyclic prefix into an original spreading code of the frequency domain, and acquiring a first spreading code in a frequency domain;

Transmitting, by the transmitter, frequency-time conversion of the first spreading code in the frequency domain, and acquiring a first spreading code in a time domain;

The transmitter acquires an output signal according to the first spreading code and the baseband digital signal in the time domain, and transmits the output signal to the receiver.

With reference to the fifth aspect, in a possible implementation manner of the fifth aspect, the transmitter acquires an output signal according to the first spreading code and the baseband digital signal in the time domain, and sends the output signal To the receiver, including:

Transmitting, by the transmitter, a time domain cyclic prefix into a first spreading code of the time domain, and acquiring a second spreading code in a time domain;

The transmitter multiplies the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal;

The transmitter performs digital analog conversion on the second to-be-output signal to obtain a second analog signal;

The transmitter modulates the second analog signal, acquires the output signal, and transmits the output signal to a receiver.

In a sixth aspect, an embodiment of the present invention provides a data transmission method, including:

Transmitting the time domain cyclic prefix into the original spreading code to obtain the first spreading code in the time domain;

In conjunction with the sixth aspect, in a possible implementation manner of the sixth aspect, the transmitter is configured according to The first spreading code and the baseband digital signal in the time domain acquire an output signal, and send the output signal to a receiver, including:

Transmitting, by the transmitter, time-frequency conversion of the first spreading code in the time domain to obtain a first spreading code in a frequency domain;

Transmitting, by the transmitter, a frequency domain cyclic prefix into a first spreading code of the frequency domain, and acquiring a second spreading code in the frequency domain;

The transmitter performs frequency-time conversion on the second spreading code in the frequency domain to obtain a second spreading code in the time domain;

Transmitting, by the transmitter, the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal;

In a seventh aspect, an embodiment of the present invention provides a data transmission method, including:

The receiver receives an output signal sent by the transmitter;

The receiver removes a frequency domain cyclic prefix in the output signal, and acquires a first to-be-processed signal;

The receiver acquires recovery data according to the first to-be-processed signal.

With reference to the seventh aspect, in a possible implementation manner of the seventh aspect, the receiver removes a frequency domain cyclic prefix in the output signal, and acquires a first to-be-processed signal, including:

The receiver performs time-frequency conversion on the output signal, acquires a frequency domain signal, determines a frequency domain synchronization range according to the frequency domain signal, removes the frequency domain cyclic prefix according to the frequency domain synchronization range, and obtains an effective frequency domain signal. And performing frequency-time conversion on the valid frequency domain signal to obtain a first to-be-processed signal.

With reference to the seventh aspect, and a possible implementation manner of the foregoing seventh aspect, in another possible implementation manner of the seventh aspect, the receiver removes a frequency domain cyclic prefix in the output signal, and obtains the first Signal to be processed, including;

The receiver determines a frequency domain synchronization range according to the output signal, and sets a band pass filter according to the frequency domain synchronization range to remove the frequency domain cyclic prefix to obtain a first to-be-processed signal.

With reference to the seventh aspect, and a possible implementation manner of the foregoing seventh aspect, in another possible implementation manner of the seventh aspect, the acquiring, by the receiver, the recovery data according to the first to-be-processed signal includes:

The receiver determines a time domain synchronization position according to the first to-be-processed signal, and removes a time domain cyclic prefix in the first to-be-processed signal according to the time domain synchronization position, to obtain a second to-be-processed signal;

And decompressing the second to-be-processed signal by using an original spreading code to obtain recovery data.

In an eighth aspect, an embodiment of the present invention provides a data transmission method, including:

The receiver receives an output signal sent by the transmitter;

The receiver removes a time domain cyclic prefix in the output signal, and acquires a first to-be-processed signal;

With reference to the eighth aspect, in a possible implementation manner of the eighth aspect, the receiver removes a time domain cyclic prefix in the output signal, and acquires a first to-be-processed signal, including:

The receiver determines a time domain synchronization position according to the output signal, and removes the time domain cyclic prefix according to the time domain synchronization position to acquire a first to-be-processed signal.

With reference to the eighth aspect, and a possible implementation manner of the foregoing eighth aspect, in another possible implementation manner of the eighth aspect, the receiving, by the receiver, the recovery data according to the first to-be-processed signal includes:

The receiver converts the first to-be-processed signal into a frequency domain signal, and removes a frequency domain cyclic prefix in the frequency domain signal, acquires a valid frequency domain signal, and converts the effective frequency domain signal into a second signal to be processed;

The receiver acquires recovery data according to the second to-be-processed module.

A ninth aspect, an embodiment of the present invention provides a transmitter, including:

a processor, configured to generate an original spreading code, perform time-frequency conversion on the original spreading code, obtain an original spreading code in a frequency domain, and insert a frequency domain cyclic prefix into the original spreading code in the frequency domain, Obtaining a first spreading code in the frequency domain, performing frequency-time conversion on the first spreading code in the frequency domain, acquiring a first spreading code in the time domain, according to the first spreading code and the baseband number in the time domain Signal, obtaining an output signal;

a transmitter for transmitting the output signal to a receiver.

In a tenth aspect, an embodiment of the present invention provides a transmitter, including:

a processor, configured to generate an original spreading code, insert a time domain cyclic prefix into the original spreading code, and obtain a first spreading code in a time domain, according to the first spreading code and the baseband number in the time domain Signal, obtaining an output signal;

a transmitter for transmitting the output signal to a receiver.

In an eleventh aspect, an embodiment of the present invention provides a receiver, including:

a receiver for receiving an output signal sent by the transmitter;

And a processor, configured to remove a frequency domain cyclic prefix in the output signal, acquire a first to-be-processed signal, and acquire recovery data according to the first to-be-processed signal.

According to a twelfth aspect, an embodiment of the present invention provides a receiver, including:

a receiver for receiving an output signal sent by the transmitter;

And a processor, configured to remove a time domain cyclic prefix in the output signal, acquire a first to-be-processed signal, and acquire recovery data according to the first to-be-processed signal.

In the transmitter, the receiver, and the data transmission method of the embodiment of the present invention, the frequency domain cyclic prefix is inserted into the original spreading code by the time-frequency conversion module and the frequency domain cyclic prefix insertion module, and the first spreading code in the frequency domain is obtained, and Obtaining a first spreading code of the time domain by using a frequency-time conversion module, performing a spread spectrum process on the baseband digital signal by using the first spreading code of the time domain to obtain an output signal, and transmitting the output signal to the receiver through a fiber link It can compensate the relative frequency offset of multiple users and effectively solve the problem of multiple access interference between multiple users.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic diagram of an application scenario of the present invention;

2 is a schematic structural diagram of Embodiment 1 of a transmitter according to the present invention;

3 is a schematic structural diagram of Embodiment 2 of a transmitter according to the present invention;

4 is a schematic structural diagram of Embodiment 3 of a transmitter according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 4 of a transmitter according to the present invention; FIG.

6 is a schematic structural diagram of Embodiment 5 of a transmitter according to the present invention;

7 is a schematic structural diagram of Embodiment 6 of a transmitter according to the present invention;

FIG. 8 is a schematic structural diagram of Embodiment 1 of a receiver according to the present invention; FIG.

9 is a schematic structural diagram of Embodiment 2 of a receiver according to the present invention;

10 is a schematic structural diagram of Embodiment 3 of a receiver according to the present invention;

11A is a schematic structural diagram of Embodiment 4 of a receiver according to the present invention;

11B is a schematic structural diagram of a time domain cyclic prefix removal module;

12 is a schematic structural diagram of Embodiment 5 of a receiver according to the present invention;

13 is a schematic structural diagram of Embodiment 6 of a transmitter according to the present invention;

14A is a schematic structural diagram of Embodiment 1 of a frequency domain cyclic prefix removal module in the transmitter shown in FIG. 13;

14B is a schematic structural diagram of Embodiment 2 of a frequency domain cyclic prefix removal module in the transmitter shown in FIG. 13;

15 is a flowchart of Embodiment 1 of a data transmission method according to the present invention;

16 is a flowchart of Embodiment 2 of a data transmission method according to the present invention;

FIG. 17 is a schematic structural diagram of an embodiment of a data transmission system according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a schematic diagram of an application scenario of the present invention. As shown in FIG. 1 , an application scenario of an embodiment of the present invention may be a CDMA system with multiple users accessing, and multiple users access the image through the transmitter of the embodiment of the present invention. In the system shown in FIG. 1, the transmitter serves as an access node, which can receive the uplink transmission data of the user, and correspondingly process the data transmitted by the uplink, and then send the uplink transmission data of the user to the central exchange through the optical fiber. The receiver of the embodiment of the present invention can be used as an ingress node for accessing data of uplink transmission of multiple users, as shown in FIG. 1 , and a coupling can be set between the central switching network and each access node. The coupler is used to couple optical signals of different users. The transmitter of the embodiment of the present invention may perform spreading processing on the uplink transmission data of the user, where the uplink transmission data of the user may be adopted by using a spreading code inserted with a frequency domain cyclic prefix (cyclic prefix) in the spreading processing process. The spreading is performed, and then the other processing is sent to the central switching network. The receiver in the embodiment of the present invention in the central switching network receives the transmission data, and performs despreading processing on the transmission data, where the despreading process may be performed first. The frequency domain cyclic prefix in the transmission data is removed, and then despread according to the stored original spreading code to recover the data. Therefore, the transmitter and the receiver in the embodiment of the present invention can utilize the frequency domain cyclic prefix to compensate the multi-user relative frequency offset, thereby effectively reducing the multiple access crosstalk between multiple users.

In another implementation manner, the transmitter of the embodiment of the present invention may perform a spreading process on the uplink transmission data of the user, where a spreading code inserted in a time domain cyclic prefix (cyclic prefix) may be used in the spreading process. The data of the uplink transmission of the user is spread, and then the other processing is sent to the central switching network. The receiver of the embodiment of the present invention in the central switching network receives the transmission data, and performs despreading processing on the transmission data. During the despreading process, the time domain cyclic prefix in the transmission data may be removed first, and then despread according to the stored original spreading code to recover the data. Therefore, the transmitter and the receiver in the embodiment of the present invention can utilize the time domain cyclic prefix to reduce inter-symbol interference caused by link loss such as chromatic dispersion, DGD, and multiple-access interference between multiple users.

In another implementation manner, the transmitter of the embodiment of the present invention may perform a spreading process on the uplink transmission data of the user, where a time domain cyclic prefix and a frequency domain loop may be inserted in the spreading process. The spreading code of the prefix spreads the data of the uplink transmission of the user, and then performs corresponding other processing and sends the data to the central switching network. The receiver of the embodiment of the present invention in the central switching network receives the transmission data and solves the transmission data. The expansion process, in which the time domain cyclic prefix in the transmission data may be removed first, and then the frequency domain cyclic prefix in the transmission data is removed, and then the despreading is performed according to the stored original spreading code to recover the data. The transmitter and the receiver in the embodiment of the present invention can utilize the time domain cyclic prefix and the frequency domain cyclic prefix to reduce inter-symbol interference caused by link loss such as chromatic dispersion and DGD, and multiple-access interference between multiple users. At the same time, the relative frequency offset of multiple users can be effectively compensated, thereby further effectively reducing the multiple access crosstalk between multiple users.

The following is a specific solution to the technical solution of the embodiment of the present invention by using several specific embodiments. Explanation.

2 is a schematic structural diagram of Embodiment 1 of a transmitter according to the present invention. As shown in FIG. 2, the transmitter of this embodiment may include: a spreading code generator 11, a time-frequency conversion module 12, and a frequency domain cyclic prefix insertion module 13. The frequency conversion module 14 and the output module 15.

The spreading code generator 11 is configured to generate an original spreading code. The time-frequency converting module 12 is configured to perform time-frequency conversion on the original spreading code to obtain an original spreading code in a frequency domain, and a frequency domain cyclic prefix. The insertion module 13 is configured to insert a frequency domain cyclic prefix into the original spreading code of the frequency domain to obtain a first spreading code in the frequency domain, and a frequency-time conversion module 14 configured to use the first frequency domain. The spreading code performs frequency-time conversion to obtain a first spreading code in the time domain; the output module 15 is configured to obtain an output signal according to the first spreading code and the baseband digital signal in the time domain, and output the output signal Send to the receiver.

Specifically, the time-frequency conversion module 12 performs time-frequency conversion on the original spreading code generated by the spreading code generator 11 to obtain an original spreading code in the frequency domain, and the time-frequency conversion may specifically adopt a discrete Fourier transform (Discrete Fourier Transform). For short, DFT, it is also possible to use Fast Fourier Transformation (FFT), which converts the original spreading code of the time domain into the original spreading code of the frequency domain. The original spreading code in the time domain is {c ₁ , c ₂ , c ₃ , c ₄ , c ₅ , c ₆ , c ₇ , c ₈ }, and the frequency domain is converted by the time-frequency conversion module 12. The original spreading code is {f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ }. Thereafter, the frequency domain cyclic prefix insertion module 13 inserts the frequency domain cyclic prefix CP (herein the frequency domain CP is {f ₁ , f ₂ } as an example) into the original spreading code of the frequency domain ({f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ }), obtaining a first spreading code in the frequency domain, wherein the first spreading code in the frequency domain is {f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ , f ₁ , f ₂ }. Then, the frequency-time conversion module 14 performs frequency-time conversion on the first spreading code of the frequency domain to obtain a first spreading code in the time domain, and further exemplifies the above example, where the first spreading code in the time domain is Is {c ₁ ',c' ₂ ,c' ₃ ,c' ₄ ,c' ₅ ,c' ₆ ,c' ₇ ,c' ₈ ,c' ₉ ,c' ₁₀ }, wherein the frequency conversion is specific Inverse Discrete Fourier Transform (IDFT) may be used, or Inverse Fast Fourier Transformation (IFFT) may be used, which may correspond to time-frequency conversion. Then, the baseband digital signal to be transmitted and the first spreading code of the time domain are processed correspondingly by the output module 15, the output signal is obtained, and the output signal is sent to the receiver through the fiber link.

In this embodiment, the frequency domain cyclic prefix is inserted into the original spreading code by the time-frequency conversion module and the frequency domain cyclic prefix insertion module, and the first spreading code in the frequency domain is obtained, and the time domain is obtained by the frequency-time conversion module. a spreading code, using the first spreading code of the time domain to spread the baseband digital signal, etc. The output signal is obtained, and the output signal is sent to the receiver through the optical fiber link to compensate the relative frequency offset of multiple users, and the problem of multiple access interference between multiple users is effectively solved.

FIG. 3 is a schematic structural diagram of a second embodiment of a transmitter according to the present invention. As shown in FIG. 3, the apparatus of the embodiment is implemented on the basis of the apparatus structure shown in FIG. 2, and the output module 15 may specifically include: multiplication. The 151, the digital to analog conversion module 152, and the modulator 153. The multiplier 151 is configured to multiply the first spreading code of the time domain and the baseband digital signal to obtain a first to-be-output signal, and the digital-to-analog conversion module 152 is configured to perform digital processing on the first to-be-output signal. The first analog signal is obtained by analog conversion. The modulator 153 is configured to perform carrier modulation on the first analog signal, acquire the output signal, and send the output signal to the receiver.

In this embodiment, the frequency domain cyclic prefix is inserted into the original spreading code by the time-frequency conversion module and the frequency domain cyclic prefix insertion module, and the first spreading code in the frequency domain is obtained, and the time domain is obtained by the frequency-time conversion module. a spreading code, using a first spreading code of the time domain to perform a spreading process on the baseband digital signal to obtain a first to-be-output signal, and the first to-be-output signal is subjected to digital-to-analog conversion, and then performing carrier modulation The fiber link is sent to the receiver to compensate for the relative frequency offset of multiple users, and effectively solve the problem of multiple access interference among multiple users.

4 is a schematic structural diagram of a third embodiment of a transmitter according to the present invention. As shown in FIG. 4, the device in this embodiment is based on the device structure shown in FIG. 2, and another implementation manner, the output module 15 may specifically include a time domain cyclic prefix insertion module 151, a multiplier 152, a digital to analog conversion module 153, and a modulator 154, wherein the time domain cyclic prefix insertion module 151 is configured to insert a time domain cyclic prefix into the first spreading of the time domain. a second spreading code of the time domain, the multiplier 152 is configured to multiply the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal, the digital-to-analog conversion module 153. The digital analog conversion is performed on the second to-be-output signal to obtain a second analog signal. The modulator 154 is configured to modulate the second analog signal, obtain the output signal, and send the output signal. To the receiver.

In this embodiment, the frequency domain cyclic prefix is inserted into the original spreading code by the time-frequency conversion module and the frequency domain cyclic prefix insertion module, and the first spreading code in the frequency domain is obtained, and the time domain is obtained by the frequency-time conversion module. a spreading code, further inserting a time domain cyclic prefix into the first spreading code of the time domain by using a time domain cyclic prefix insertion module, acquiring a second spreading code in the time domain, and using the second spreading in the time domain The code performs processing such as spreading on the baseband digital signal to obtain an output signal, and the output signal is sent to the receiver through the optical fiber link, thereby realizing the relative frequency offset of the multi-user signal, and effectively solving the multi-user relationship. At the same time of the problem of multiple access interference, the insertion of the time domain cyclic prefix can compensate the relative delay before the spreading code of the multi-user signal, and effectively solve the multiple access interference and inter-code interference caused by link damage such as chromatic dispersion and DGD in the optical fiber link. The problem of interference.

Different from the frequency domain cyclic prefix inserted in the spreading code in the embodiment shown in FIG. 2 to FIG. 4 above, the embodiment shown in FIG. 5 to FIG. 7 first inserts the time domain cyclic prefix in the spreading code, as shown in the following. A detailed explanation of the embodiments is given.

FIG. 5 is a schematic structural diagram of Embodiment 4 of a transmitter according to the present invention. As shown in FIG. 5, the apparatus in this embodiment may include: a spreading code generator 21, a time domain cyclic prefix insertion module 22, and an output module 23.

The spreading code generation 21 is configured to generate an original spreading code, and the time domain cyclic prefix insertion module 22 is configured to insert a time domain cyclic prefix into the original spreading code to obtain a first spreading code in the time domain. The output module 23 is configured to obtain an output signal according to the first spreading code and the baseband digital signal in the time domain, and send the output signal to the receiver.

Specifically, the time domain cyclic prefix insertion module 22 inserts the time domain cyclic prefix into the original spreading code to obtain the first spreading code in the time domain, and then the output module 23 uses the first spreading code pair in the time domain. The baseband digital signal is processed by spreading, and then transmitted to the receiver. The original spreading code in the time domain is {c ₁ , c ₂ , c ₃ , c ₄ , c ₅ , c ₆ , c ₇ , c ₈ }, and the time domain cyclic prefix insertion module 22 processes the acquired time. The first spreading code of the domain is {c ₁ , c ₂ , c ₃ , c ₄ , c ₅ , c ₆ , c ₇ , c ₈ , c ₁ , c ₂ }, and the output module 23 can use the time domain. The first spreading code {c ₁ , c ₂ , c ₃ , c ₄ , c ₅ , c ₆ , c ₇ , c ₈ , c ₁ , c ₂ } performs spreading processing on the baseband digital signal.

In this embodiment, the first spreading code in the time domain is obtained by inserting the time domain cyclic prefix in the original spreading code, and then the baseband digital signal is spread-spreaded by using the first spreading code in the time domain, and the time domain is inserted. The cyclic prefix can compensate the relative delay before the spreading code of the multi-user signal, and effectively solve the problem of multiple access interference and inter-symbol interference caused by link damage such as chromatic dispersion and DGD in the optical fiber link.

FIG. 6 is a schematic structural diagram of Embodiment 5 of a transmitter according to the present invention. As shown in FIG. 6, the apparatus of this embodiment is based on the apparatus structure shown in FIG. 5, and an output manner may be adopted. The output module 23 may specifically include a multiplier. 231, the digital-to-analog conversion module 232 and the modulator 233, wherein the multiplier 231 is configured to multiply the first spreading code of the time domain and the baseband digital signal to obtain a first to-be-output signal, and the digital-to-analog conversion The module 232 is configured to perform digital-to-analog conversion on the first to-be-output signal to obtain a first analog signal. The modulator is configured to perform carrier modulation on the first analog signal, obtain the output signal, and output the output. The signal is sent to the receiver.

FIG. 7 is a schematic structural diagram of Embodiment 6 of the transmitter of the present invention. As shown in FIG. 7, the apparatus of this embodiment is based on the apparatus structure shown in FIG. 5, and another implementation manner, the output module 23 may specifically include The time-frequency conversion module 231, the frequency domain cyclic prefix insertion module 232, the frequency-time conversion module 233, the multiplier 234, the digital-to-analog conversion module 235, and the modulator 236.

The time-frequency conversion module 231 is configured to perform time-frequency conversion on the first spreading code in the time domain to obtain a first spreading code in the frequency domain, and the frequency domain cyclic prefix insertion module 232 is configured to perform frequency domain cycling. The prefix is inserted into the first spreading code of the frequency domain, and the second spreading code in the frequency domain is obtained. The frequency conversion module 233 is configured to perform frequency-time conversion on the second spreading code in the frequency domain. a second spreading code of the domain, the multiplier 234 is configured to multiply the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal, and the digital-to-analog conversion module 235 is configured to: The second to-be-output signal is subjected to digital-to-analog conversion to obtain a second analog signal, and the modulator 236 is configured to modulate the second analog signal, acquire the output signal, and send the output signal to the receiver.

The original spreading code in the time domain shown in FIG. 5 is {c ₁ , c ₂ , c ₃ , c ₄ , c ₅ , c ₆ , c ₇ , c ₈ }, and the time domain cyclic prefix insertion module 22 processes and obtains The first spreading code of the time domain is {c ₁ , c ₂ , c ₃ , c ₄ , c ₅ , c ₆ , c ₇ , c ₈ , c ₁ , c ₂ }, for further illustration, this embodiment The time-frequency conversion module 231 performs time-frequency conversion on the first spreading code in the time domain to obtain a first spreading code in the frequency domain, where the first spreading code in the frequency domain is {f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ , f ₉ , f ₁₀ }, the frequency domain cyclic prefix insertion module 232 further inserts the frequency domain cyclic prefix into the first spreading code of the frequency domain, Obtaining a second spreading code {f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , f ₇ , f ₈ , f ₉ , f ₁₀ , f ₁ , f ₂ } in the frequency domain, frequency-time conversion The module 233 performs frequency-time conversion on the second spreading code of the frequency domain to obtain a second spreading code {c ₁ ', c' ₂ , c' ₃ , c' ₄ , c' ₅ , c' _{6 of the} time domain. , c' ₇ , c' ₈ , c' ₉ , c' ₁₀ , c' ₁₁ , c' ₁₂ }, after which the baseband digital signal is spread by the second spreading code of the time domain by the multiplier 234 And passed through the digital-to-analog conversion module 235 and the modulator 236 to pass the light Link transmission to the receiver.

In this embodiment, the first spreading code of the time domain is obtained by inserting the time domain cyclic prefix into the original spreading code, and then the first spreading code of the time domain is inserted in the time domain conversion module and the frequency domain cyclic prefix insertion module. Inserting a frequency domain cyclic prefix to obtain a second spreading code in the frequency domain, and then performing frequency-time conversion to obtain a second spreading code in the time domain, and spreading the baseband digital signal by using the second spreading code in the time domain Processing, wherein the insertion of the time domain cyclic prefix in the second spreading code of the time domain can compensate the relative delay before the spreading code of the multi-user signal, and effectively solves the problem caused by link damage such as chromatic dispersion and DGD in the optical fiber link. Address interference and inter-symbol interference, the frequency domain is inserted in the second spreading code of the time domain The ring prefix can compensate for the relative frequency offset of multiple users and effectively solve the problem of multiple access interference between multiple users.

FIG. 8 is a schematic structural diagram of Embodiment 1 of a receiver according to the present invention. As shown in FIG. 8, the apparatus in this embodiment may include: a receiving module 31, a cyclic prefix removing module 32, and a processing module 33.

The receiving module 31 is configured to receive an output signal sent by the transmitter, and the cyclic prefix removing module 32 is configured to convert the output signal into a frequency domain signal, and remove a frequency domain cyclic prefix in the frequency domain signal to obtain the first The processing module 33 is configured to obtain recovery data according to the first to-be-processed signal.

In an implementation manner, the cyclic prefix removal module 32 may specifically include a frequency domain cyclic prefix removal module, where the frequency domain cyclic prefix removal module is configured to perform time-frequency conversion on the output signal to obtain a frequency domain signal according to the frequency domain signal. Determining a frequency domain synchronization range, removing the frequency domain cyclic prefix according to the frequency domain synchronization range, obtaining a valid frequency domain signal, and performing frequency-time conversion on the effective frequency domain signal to obtain a first to-be-processed signal.

In another implementation manner, the cyclic prefix removal module 32 includes a frequency domain cyclic prefix removal module, where the frequency domain cyclic prefix removal module is specifically configured to determine a frequency domain synchronization range according to the output signal, and synchronize according to the frequency domain. The range setting band pass filter removes the frequency domain cyclic prefix to obtain a first pending signal.

In this embodiment, the receiver removes the frequency domain cyclic prefix in the process of performing digital signal processing on the received signal, thereby acquiring recovery data, and effectively solving the problem of multiple access interference between multiple users.

FIG. 9 is a schematic structural diagram of Embodiment 2 of a receiver according to the present invention. As shown in FIG. 9, the apparatus of this embodiment is based on the apparatus structure shown in FIG. 8. The cyclic prefix removal module 32 may specifically include a time-frequency conversion module 3211. The frequency domain cyclic prefix removal sub-module 3212, the frequency-time conversion module 3213, and the frequency domain synchronization module 3214, wherein the time-frequency conversion module 3211 is configured to perform time-frequency conversion on the digital signal to obtain a frequency domain signal, and the frequency domain The synchronization module 3212 is configured to determine a frequency domain synchronization range according to the frequency domain signal, and send the frequency domain synchronization range to the frequency domain cyclic prefix removal submodule, where the frequency domain cyclic prefix removal submodule 3213 is configured to The frequency domain synchronization range is used to remove the frequency domain cyclic prefix in the frequency domain signal, and obtain a valid frequency domain signal. The frequency time conversion module 3214 is configured to perform frequency conversion on the effective frequency domain signal to obtain the first to be used. Process the signal.

In this embodiment, the receiver performs digital signal processing on the relevant received signal. Firstly, the received signal is time-frequency converted to obtain a frequency domain signal, and then the frequency domain synchronization range is determined according to the frequency domain signal, and the frequency domain cyclic prefix in the frequency domain signal is removed by using the frequency domain synchronization range to obtain an effective frequency domain signal. And acquiring recovery data according to the effective frequency domain signal, thereby effectively solving the problem of multiple access interference between multiple users.

10 is a schematic structural diagram of Embodiment 3 of a receiver of the present invention. As shown in FIG. 10, the apparatus of this embodiment is based on the apparatus structure shown in FIG. 8. The cyclic prefix removal module 32 may specifically include a frequency domain synchronization module 3211. And a band pass filtering module 3212, wherein the frequency domain synchronization module 3211 is configured to determine a frequency domain synchronization range according to the digital signal, and send the frequency domain synchronization range to the band pass filtering module, the band pass filtering module 3212 And a band pass filter is set according to the frequency domain synchronization range to remove the frequency domain cyclic prefix to obtain a first to-be-processed signal.

In this embodiment, the receiver determines the frequency domain synchronization range according to the digital signal in the process of performing digital signal processing on the related received signal, and uses the frequency domain synchronization range to set a band pass filter to remove the frequency domain cyclic prefix in the digital signal. In order to obtain recovery data, the problem of multiple access interference between multiple users is effectively solved.

11A is a schematic structural diagram of Embodiment 4 of a receiver according to the present invention, and FIG. 11B is a schematic structural diagram of a time domain cyclic prefix removal module. As shown in FIG. 11A and FIG. 11B, the apparatus of this embodiment is in any of FIG. 8 to FIG. On the basis of the device structure, the processing module 33 may further include a time domain cyclic prefix removal module 331 and a despreading module 332, wherein the time domain cyclic prefix removal module 331 is configured to determine according to the first to-be-processed signal. a time domain synchronization position, the time domain cyclic prefix in the first to-be-processed signal is removed according to the time domain synchronization position, and a second to-be-processed signal is obtained; the despreading module 332 is configured to use the original spreading code to the second The signal to be processed is despread and the recovered data is obtained.

Optionally, the time domain cyclic prefix removal module 331 may specifically include a timing synchronization module 3311 and a time domain cyclic prefix removal submodule 3312. The timing synchronization module 3311 is configured to determine a time domain according to the first to-be-processed signal. Synchronizing the location, and sending the time domain synchronization location to the time domain cyclic prefix removal submodule; the time domain cyclic prefix removal submodule 3312, configured to remove the time domain loop in the first to-be-processed signal according to the time domain synchronization location The prefix acquires the second pending signal.

In this embodiment, the receiver removes the frequency domain cyclic prefix and removes the time domain cyclic prefix for the related received signal, thereby acquiring the restored data, and effectively solving the problem of multiple access interference among multiple users. And solve the chain due to dispersion, DGD, etc. in the fiber link The problem of multiple access interference and intersymbol interference caused by road damage.

FIG. 12 is a schematic structural diagram of Embodiment 5 of a receiver according to the present invention. As shown in FIG. 12, the apparatus in this embodiment may include: a receiving module 41, a cyclic prefix removing module 42 and a processing module 43, where the receiving module 41 is used. Receiving an output signal sent by the transmitter, the cyclic prefix removal module 42 is configured to remove a time domain cyclic prefix in the output signal, and obtain a first to-be-processed signal, where the processing mode 43 is used to generate, according to the first to-be-processed signal Get recovery data.

Specifically, the cyclic prefix removal module 42 may specifically include a time domain cyclic prefix removal module, where the time domain cyclic prefix removal module is configured to determine a time domain synchronization location according to the output signal, and remove the location according to the time domain synchronization location. The time domain cyclic prefix acquires the first pending signal.

In this embodiment, the receiver removes the time domain cyclic prefix in the process of performing digital signal processing on the received signal, thereby acquiring recovery data, thereby effectively solving the problem caused by link damage such as dispersion and DGD in the optical fiber link. Address interference and inter-symbol interference.

FIG. 13 is a schematic structural diagram of Embodiment 6 of the transmitter of the present invention. As shown in FIG. 13, the apparatus of this embodiment is based on the apparatus structure shown in FIG. 12, and the processing module 43 may specifically include a frequency domain cyclic prefix removal module 431. And a despreading module 432, wherein the frequency domain cyclic prefix removing module 431 is configured to convert the first to-be-processed signal into a frequency domain signal, and remove a frequency domain cyclic prefix in the frequency domain signal to obtain an effective frequency domain signal. And converting the valid frequency domain signal into a second to-be-processed signal; the despreading module 432 is configured to acquire recovery data according to the second to-be-processed module.

In this embodiment, the receiver removes the time domain cyclic prefix for the related received signal, and then removes the frequency domain cyclic prefix to obtain the recovered data, thereby effectively solving the problem of multiple access interference among multiple users. And solve the problem of multiple access interference and intersymbol interference caused by link damage such as chromatic dispersion and DGD in the optical fiber link.

14A is a schematic structural diagram of Embodiment 1 of a frequency domain cyclic prefix removal module in the transmitter shown in FIG. 13 , and FIG. 14B is a schematic structural diagram of Embodiment 2 of a frequency domain cyclic prefix removal module in the transmitter shown in FIG. 13 , as shown in FIG. 14A . The apparatus of this embodiment is based on the apparatus structure shown in FIG. 13. The frequency domain cyclic prefix removal module 431 may specifically include a time-frequency conversion module 4311, a frequency domain cyclic prefix removal sub-module 4312, a frequency-time conversion module 4313, and a frequency domain. a synchronization module 4314, wherein the time-frequency conversion module 4311 is configured to perform time-frequency conversion on the first to-be-processed signal to obtain a frequency domain signal, and the frequency domain synchronization module 4314 is configured to determine frequency domain synchronization according to the frequency domain signal. a range, and sending the frequency domain synchronization range to the frequency domain cyclic prefix removal submodule, the frequency domain cyclic prefix removing the submodule Block 4312, configured to remove a frequency domain cyclic prefix in the frequency domain signal according to the frequency domain synchronization range, and obtain a valid frequency domain signal, where the frequency time conversion module 4313 is configured to perform frequency response on the valid frequency domain signal. Converting to obtain a second pending signal.

As shown in FIG. 14B, the frequency domain cyclic prefix removal module 431 may specifically include a frequency domain synchronization module 4317 and a band pass filtering module 4318. The frequency domain synchronization module 4317 is configured to determine a frequency domain synchronization range according to the first to-be-processed signal. Transmitting the frequency domain synchronization range to the band pass filtering module 4318; the band pass filtering module 4318 is configured to remove the band in the first to-be-processed signal according to the frequency domain synchronization range setting band pass filter The frequency domain cyclic prefix acquires a second to-be-processed signal.

FIG. 15 is a flowchart of Embodiment 1 of a data transmission method according to the present invention. The present embodiment relates to a transmitter and a receiver. As shown in FIG. 15, the method in this embodiment may include:

Step 101: The transmitter performs time-frequency conversion on the original spreading code to obtain an original spreading code in the frequency domain.

Step 102: The transmitter inserts a frequency domain cyclic prefix into the original spreading code of the frequency domain, and acquires a first spreading code in the frequency domain.

Step 103: The transmitter performs frequency-time conversion on the first spreading code in the frequency domain, and acquires a first spreading code in the time domain.

Step 104: The transmitter acquires an output signal according to the first spreading code and the baseband digital signal in the time domain.

Step 105: The transmitter sends the output signal to a receiver, and the receiver receives an output signal sent by the transmitter.

Step 106: The receiver removes a frequency domain cyclic prefix in the output signal, and acquires a first to-be-processed signal.

The receiver performs time-frequency conversion on the output signal, acquires a frequency domain signal, determines a frequency domain synchronization range according to the frequency domain signal, removes the frequency domain cyclic prefix according to the frequency domain synchronization range, and obtains an effective frequency. The domain signal is subjected to frequency-time conversion of the valid frequency domain signal to obtain a first to-be-processed signal. Alternatively, the receiver determines a frequency domain synchronization range according to the output signal, and a root And setting a band pass filter according to the frequency domain synchronization range to remove the frequency domain cyclic prefix, and acquiring a first to-be-processed signal.

Step 107: The receiver acquires recovery data according to the first to-be-processed signal.

The receiver despreads the first to-be-processed signal by using an original spreading code to obtain recovered data.

Optionally, in the foregoing step, the transmitter obtains the output signal according to the first spreading code and the baseband digital signal in the time domain, and the method may include: inserting, by the transmitter, a time domain cyclic prefix into the time domain. Obtaining, in the first spreading code, a second spreading code in the time domain; the transmitter multiplying the second spreading code in the time domain and the baseband digital signal to obtain a second to-be-output signal; The transmitter performs digital analog conversion on the second to-be-output signal to obtain a second analog signal; the transmitter modulates the second analog signal to obtain the output signal.

Correspondingly, the step 107 may include: the receiver determining a time domain synchronization position according to the first to-be-processed signal, and removing a time domain cyclic prefix in the first to-be-processed signal according to the time domain synchronization position, Obtaining a second to-be-processed signal; despreading the second to-be-processed signal by using an original spreading code to obtain recovery data.

In this embodiment, the first spreading code in the frequency domain is obtained by inserting the frequency domain cyclic prefix into the original spreading code, and the first spreading code in the time domain is obtained by frequency-time conversion, and the first time domain is used. The spreading code performs processing such as spreading on the baseband digital signal to obtain an output signal, and the output signal is sent to the receiver through the optical fiber link, and the receiver removes the frequency domain cyclic prefix in the output signal, thereby acquiring recovery data, and the data is obtained. The transmission method can compensate the relative frequency offset of multiple users and effectively solve the problem of multiple access interference among multiple users.

FIG. 16 is a flowchart of Embodiment 2 of a data transmission method according to the present invention. The present embodiment relates to a transmitter and a receiver. As shown in FIG. 16, the method in this embodiment may include:

Step 201: The transmitter inserts a time domain cyclic prefix into the original spreading code to obtain a first spreading code in the time domain.

Step 202: The transmitter acquires an output signal according to the first spreading code and the baseband digital signal in the time domain.

Step 203: The transmitter sends the output signal to a receiver, and the receiver receives an output signal sent by the transmitter.

Step 204: The receiver removes a time domain cyclic prefix in the output signal to obtain a first to-be. Signal.

Specifically, the receiver determines a time domain synchronization position according to the output signal, and removes the time domain cyclic prefix according to the time domain synchronization position to obtain a first to-be-processed signal.

Step 205: The receiver acquires recovery data according to the first to-be-processed signal.

Optionally, the foregoing step 202 may include: the transmitter acquiring an output signal according to the first spreading code and the baseband digital signal in the time domain, and transmitting the output signal to the receiver, including: Transmitting, by the transmitter, a time domain cyclic prefix into the first spreading code of the time domain, acquiring a second spreading code of the time domain; the transmitter transmitting the second spreading code of the time domain and the baseband Multiplying the digital signal to obtain a second to-be-output signal; the transmitter performs digital-to-analog conversion on the second to-be-output signal to obtain a second analog signal; the transmitter modulates the second analog signal to obtain The output signal.

Correspondingly, the foregoing step 205 may be specifically: the receiver converts the first to-be-processed signal into a frequency domain signal, and removes a frequency domain cyclic prefix in the frequency domain signal to obtain an effective frequency domain signal, and Converting the valid frequency domain signal into a second to-be-processed signal; the receiver acquiring recovery data according to the second to-be-processed module.

In this embodiment, the first spreading code of the time domain is obtained by inserting a time domain cyclic prefix into the original spreading code by the transmitter, and then the baseband digital signal is spread and processed by using the first spreading code of the time domain. The time domain cyclic prefix can compensate the relative delay before the spreading code of the multi-user signal, and effectively solve the problem of multiple access interference and inter-symbol interference caused by link damage such as chromatic dispersion and DGD in the optical fiber link.

FIG. 17 is a schematic structural diagram of an embodiment of a data transmission system according to the present invention. As shown in FIG. 17, the system of the embodiment includes: a transmitter and a receiver, wherein the transmitter can adopt any device embodiment of FIG. 2 to FIG. The structure, its implementation principle and technical effect are similar, and will not be described here. The receiver can adopt the structure of any device embodiment of FIG. 8 to FIG. 14B, and the implementation principle and technical effects are similar, and details are not described herein again.

It should be noted that each functional module in the transmitter of any of the embodiments shown in FIG. 2 to FIG. 7 may correspond to a processor and a transmitter of the transmitter, where the processor may be a central processing unit (Central Processing) Unit, CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits that implement embodiments of the present invention. Wherein, the function of the output module for transmitting the output signal to the receiver may be The processor controls the transmitter implementation, and the functions of other functional modules can be implemented by the processor.

It should be noted that each functional module in the receiver of any of the embodiments shown in FIG. 8 to FIG. 14B may correspond to a processor and a receiver of the transmitter, where the processor may be a central processing unit (Central Processing) Unit, CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits that implement embodiments of the present invention. The function of the receiving module for receiving the output signal sent by the transmitter can be implemented by the receiver, and the functions of other functional modules can be implemented by the processor.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as the unit may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. . Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The above software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the methods of the various embodiments of the present invention. Part of the steps. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

Those skilled in the art will clearly understand that for the convenience and brevity of the description, only the above The division of the function modules is exemplified. In practical applications, the above function assignments may be completed by different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the device described above, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

A transmitter, comprising:

a spreading code generator for generating an original spreading code;

a time-frequency conversion module, configured to perform time-frequency conversion on the original spreading code to obtain an original spreading code in a frequency domain;

a frequency domain cyclic prefix insertion module, configured to insert a frequency domain cyclic prefix into an original spreading code of the frequency domain, to obtain a first spreading code in a frequency domain;

a frequency-time conversion module, configured to perform frequency-time conversion on the first spreading code in the frequency domain, and acquire a first spreading code in a time domain;

And an output module, configured to acquire an output signal according to the first spreading code and the baseband digital signal in the time domain, and send the output signal to the receiver.
The transmitter according to claim 1, wherein said output module comprises a multiplier, a digital to analog conversion module, and a modulator;

The multiplier is configured to multiply the first spreading code of the time domain and the baseband digital signal to obtain a first to-be-output signal;

The digital-to-analog conversion module is configured to perform digital-to-analog conversion on the first to-be-output signal to obtain a first analog signal;

The modulator is configured to modulate the first analog signal, acquire the output signal, and send the output signal to a receiver.
The transmitter according to claim 1, wherein the output module comprises a time domain cyclic prefix insertion module, a multiplier, a digital to analog conversion module, and a modulator;

The time domain cyclic prefix insertion module is configured to insert a time domain cyclic prefix into a first spreading code of the time domain, and acquire a second spreading code in a time domain;

The multiplier is configured to multiply the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal;

The digital-to-analog conversion module is configured to perform digital-to-analog conversion on the second to-be-output signal to obtain a second analog signal;

The modulator is configured to modulate the second analog signal, acquire the output signal, and send the output signal to a receiver.
A transmitter, comprising:

a spreading code generator for generating an original spreading code;

a time domain cyclic prefix insertion module, configured to insert a time domain cyclic prefix into the original spreading code to obtain a first spreading code in a time domain;

And an output module, configured to acquire an output signal according to the first spreading code and the baseband digital signal in the time domain, and send the output signal to the receiver.
The transmitter according to claim 4, wherein said output module comprises a multiplier, a digital to analog conversion module, and a modulator;

The multiplier is configured to multiply the first spreading code of the time domain and the baseband digital signal to obtain a first to-be-output signal;

The digital-to-analog conversion module is configured to perform digital-to-analog conversion on the first to-be-output signal to obtain a first analog signal;

The modulator is configured to modulate the first analog signal, acquire the output signal, and send the output signal to a receiver.
The transmitter according to claim 4, wherein the output module comprises a time-frequency conversion module, a frequency domain cyclic prefix insertion module, a frequency-time conversion module, a multiplier, a digital-to-analog conversion module, and a modulator;

The time-frequency conversion module is configured to perform time-frequency conversion on the first spreading code of the time domain to obtain a first spreading code in a frequency domain;

The frequency domain cyclic prefix insertion module is configured to insert a frequency domain cyclic prefix into the first spreading code of the frequency domain, and acquire a second spreading code in the frequency domain;

The frequency-time conversion module is configured to perform frequency-time conversion on the second spreading code in the frequency domain to obtain a second spreading code in the time domain;

The multiplier is configured to multiply the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal;

The digital-to-analog conversion module is configured to perform digital-to-analog conversion on the second to-be-output signal to obtain a second analog signal;

The modulator is configured to modulate the second analog signal, acquire the output signal, and send the output signal to a receiver.
A receiver, comprising:

a receiving module, configured to receive an output signal sent by the transmitter;

a cyclic prefix removal module, configured to remove a frequency domain cyclic prefix in the output signal, to obtain a first to-be-processed signal;

And a processing module, configured to acquire recovery data according to the first to-be-processed signal.
The receiver according to claim 7, wherein the cyclic prefix removal module comprises a frequency domain cyclic prefix removal module;

The frequency domain cyclic prefix removal module is configured to perform time-frequency conversion on the output signal, obtain a frequency domain signal, determine a frequency domain synchronization range according to the frequency domain signal, and remove the frequency domain cyclic prefix according to the frequency domain synchronization range. Obtaining a valid frequency domain signal, and performing frequency-time conversion on the valid frequency domain signal to obtain a first to-be-processed signal.
The receiver according to claim 8, wherein the frequency domain cyclic prefix removal module comprises a time-frequency conversion module, a frequency domain cyclic prefix removal sub-module, a frequency-time conversion module, and a frequency domain synchronization module;

The time-frequency conversion module is configured to perform time-frequency conversion on the output signal to obtain a frequency domain signal;

The frequency domain synchronization module is configured to determine a frequency domain synchronization range according to the frequency domain signal, and send the frequency domain synchronization range to the frequency domain cyclic prefix removal submodule;

The frequency domain cyclic prefix removal submodule is configured to remove a frequency domain cyclic prefix in the frequency domain signal according to the frequency domain synchronization range, to obtain an effective frequency domain signal;

The frequency-time conversion module is configured to perform frequency-time conversion on the valid frequency domain signal to obtain a first to-be-processed signal;
The receiver according to claim 7, wherein the cyclic prefix removal module comprises a frequency domain cyclic prefix removal module;

The frequency domain cyclic prefix removal module is configured to determine a frequency domain synchronization range according to the output signal, and set a band pass filter according to the frequency domain synchronization range to remove the frequency domain cyclic prefix to obtain a first to-be-processed signal.
The receiver according to claim 10, wherein the frequency domain cyclic prefix removal module comprises a frequency domain synchronization module and a band pass filtering module;

The frequency domain synchronization module is configured to determine a frequency domain synchronization range according to the output signal, and send the frequency domain synchronization range to the band pass filtering module;

The band pass filtering module is configured to set a band pass filter removal according to the frequency domain synchronization range The frequency domain cyclic prefix is used to obtain the first to-be-processed signal.
The receiver according to any one of claims 7 to 11, wherein the processing module comprises a time domain cyclic prefix removal module and a despreading module;

The time domain cyclic prefix removal module is configured to determine a time domain synchronization position according to the first to-be-processed signal, and remove a time domain cyclic prefix in the first to-be-processed signal according to the time domain synchronization position, to obtain a second Signal to be processed;

The despreading module is configured to despread the second to-be-processed signal by using an original spreading code to obtain recovery data.
The receiver according to claim 12, wherein the time domain cyclic prefix removal module comprises a timing synchronization module and a time domain cyclic prefix removal submodule;

The timing synchronization module is configured to determine a time domain synchronization location according to the first to-be-processed signal, and send the time domain synchronization location to the time domain cyclic prefix removal sub-module;

The time domain cyclic prefix removal submodule is configured to remove a time domain cyclic prefix in the first to-be-processed signal according to a time domain synchronization location, and acquire a second to-be-processed signal.
A receiver, comprising:

a receiving module, configured to receive an output signal sent by the transmitter;

a cyclic prefix removal module, configured to remove a time domain cyclic prefix in the output signal, to obtain a first to-be-processed signal;

And a processing module, configured to acquire recovery data according to the first to-be-processed signal.
The receiver according to claim 14, wherein the cyclic prefix removal module comprises a time domain cyclic prefix removal module;

The time domain cyclic prefix removal module is configured to determine a time domain synchronization position according to the output signal, remove the time domain cyclic prefix according to the time domain synchronization position, and obtain and acquire a first to-be-processed signal.
The receiver according to claim 14 or 15, wherein the processing module comprises a frequency domain cyclic prefix removal module and a despreading module;

The frequency domain cyclic prefix removal module is configured to convert the first to-be-processed signal into a frequency domain signal, and remove a frequency domain cyclic prefix in the frequency domain signal, obtain a valid frequency domain signal, and The effective frequency domain signal is converted into a second to-be-processed signal;

The despreading module is configured to acquire recovery data according to the second to-be-processed module.
The receiver according to claim 16, wherein the frequency domain cyclic prefix removal module comprises a time-frequency conversion module, a frequency domain cyclic prefix removal sub-module, a frequency-time conversion module, and a frequency domain synchronization module;

The time-frequency conversion module is configured to perform time-frequency conversion on the first to-be-processed signal to obtain a frequency domain signal;

The frequency domain synchronization module is configured to determine a frequency domain synchronization range according to the frequency domain signal, and send the frequency domain synchronization range to the frequency domain cyclic prefix removal submodule;

The frequency domain cyclic prefix removal submodule is configured to remove a frequency domain cyclic prefix in the frequency domain signal according to the frequency domain synchronization range, to obtain an effective frequency domain signal;

The frequency-time conversion module is configured to perform frequency-time conversion on the valid frequency domain signal to obtain a second to-be-processed signal.
The receiver according to claim 16, wherein the frequency domain cyclic prefix removal module comprises a frequency domain synchronization module and a band pass filtering module;

The frequency domain synchronization module is configured to determine a frequency domain synchronization range according to the first to-be-processed signal, and send the frequency domain synchronization range to the band pass filtering module;

The band pass filtering module is configured to set a band pass filter according to the frequency domain synchronization range to remove the frequency domain cyclic prefix in the first to-be-processed signal, and acquire a second to-be-processed signal.
A data transmission method, comprising:

The transmitter performs time-frequency conversion on the original spreading code to obtain the original spreading code in the frequency domain;

Transmitting, by the transmitter, a frequency domain cyclic prefix into an original spreading code of the frequency domain, and acquiring a first spreading code in a frequency domain;

Transmitting, by the transmitter, frequency-time conversion of the first spreading code in the frequency domain, and acquiring a first spreading code in a time domain;

The transmitter acquires an output signal according to the first spreading code and the baseband digital signal in the time domain, and transmits the output signal to the receiver.
The method according to claim 19, wherein the transmitter obtains an output signal according to the first spreading code and the baseband digital signal in the time domain, and sends the output signal to the receiver, including:

Transmitting, by the transmitter, a time domain cyclic prefix into a first spreading code of the time domain, and acquiring a second spreading code in a time domain;

The transmitter multiplies the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal;

The transmitter performs digital analog conversion on the second to-be-output signal to obtain a second analog signal;

The transmitter modulates the second analog signal, acquires the output signal, and transmits the output signal to a receiver.
A data transmission method, comprising:

Transmitting the time domain cyclic prefix into the original spreading code to obtain the first spreading code in the time domain;

The transmitter acquires an output signal according to the first spreading code and the baseband digital signal in the time domain, and transmits the output signal to the receiver.
The method according to claim 21, wherein the transmitter obtains an output signal according to the first spreading code and the baseband digital signal in the time domain, and transmits the output signal to the receiver, including:

Transmitting, by the transmitter, time-frequency conversion of the first spreading code in the time domain to obtain a first spreading code in a frequency domain;

Transmitting, by the transmitter, a frequency domain cyclic prefix into a first spreading code of the frequency domain, and acquiring a second spreading code in the frequency domain;

The transmitter performs frequency-time conversion on the second spreading code in the frequency domain to obtain a second spreading code in the time domain;

Transmitting, by the transmitter, the second spreading code of the time domain and the baseband digital signal to obtain a second to-be-output signal;

The transmitter performs digital analog conversion on the second to-be-output signal to obtain a second analog signal;

The transmitter modulates the second analog signal, acquires the output signal, and transmits the output signal to a receiver.
A data transmission method, comprising:

The receiver receives an output signal sent by the transmitter;

The receiver removes a frequency domain cyclic prefix in the output signal, and acquires a first to-be-processed signal;

The receiver acquires recovery data according to the first to-be-processed signal.
The method according to claim 23, wherein the receiver removes a frequency domain cyclic prefix in the output signal to obtain a first to-be-processed signal, including:

The receiver performs time-frequency conversion on the output signal, acquires a frequency domain signal, determines a frequency domain synchronization range according to the frequency domain signal, removes the frequency domain cyclic prefix according to the frequency domain synchronization range, and obtains an effective frequency domain signal. And performing frequency-time conversion on the valid frequency domain signal to obtain a first to-be-processed signal.
The method according to claim 23, wherein the receiver removes a frequency domain cyclic prefix in the output signal to obtain a first to-be-processed signal, including:

The receiver determines a frequency domain synchronization range according to the output signal, and sets a band pass filter according to the frequency domain synchronization range to remove the frequency domain cyclic prefix to obtain a first to-be-processed signal.
The method according to any one of claims 23 to 25, wherein the receiving, by the receiver, the recovery data according to the first to-be-processed signal comprises:

The receiver determines a time domain synchronization position according to the first to-be-processed signal, and removes a time domain cyclic prefix in the first to-be-processed signal according to the time domain synchronization position, to obtain a second to-be-processed signal;

And decompressing the second to-be-processed signal by using an original spreading code to obtain recovery data.
A data transmission method, comprising:

The receiver receives an output signal sent by the transmitter;

The receiver removes a time domain cyclic prefix in the output signal, and acquires a first to-be-processed signal;

The receiver acquires recovery data according to the first to-be-processed signal.
The method according to claim 27, wherein the receiver removes a time domain cyclic prefix in the output signal to obtain a first to-be-processed signal, including:

The receiver determines a time domain synchronization position according to the output signal, and removes the time domain cyclic prefix according to the time domain synchronization position to acquire a first to-be-processed signal.
The method according to claim 27, wherein the receiving, by the receiver, the recovery data according to the first to-be-processed signal comprises:

The receiver converts the first to-be-processed signal into a frequency domain signal, and removes a frequency domain cyclic prefix in the frequency domain signal, acquires a valid frequency domain signal, and converts the effective frequency domain signal into a second signal to be processed;

The receiver acquires recovery data according to the second to-be-processed module.