CN106817211B

CN106817211B - Method and device for sending signal and method and device for receiving signal

Info

Publication number: CN106817211B
Application number: CN201510853905.8A
Authority: CN
Inventors: 陈磊; 张希; 邱晶
Original assignee: Huawei Technologies Co Ltd
Current assignee: XFusion Digital Technologies Co Ltd
Priority date: 2015-11-30
Filing date: 2015-11-30
Publication date: 2020-06-26
Anticipated expiration: 2035-11-30
Also published as: WO2017092653A1; CN106817211A

Abstract

The invention discloses a method and a device for sending and receiving signals, and belongs to the field of communication. The method for transmitting signals comprises the following steps: modulating each path of data to be transmitted in the m paths of data to be transmitted respectively to obtain m paths of signals to be transmitted; each path of signals to be sent in the m paths of signals to be sent occupies a section of continuous time resource and frequency resource; the time resources occupied by each path of signals to be transmitted are overlapped and not completely the same; each path of signals to be transmitted occupies continuous frequency resources and is not overlapped; performing signal superposition on the m paths of signals to be sent to form a path of superposed signals, wherein the initial position of at least one path of signals to be sent in the superposed signals is later than the initial position of the superposed signals and/or the end position of at least one path of signals to be sent in the superposed signals is earlier than the end position of the superposed signals; and sending the superposed signal. The invention can send each path of signals with different time lengths.

Description

Method and device for sending signal and method and device for receiving signal

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for transmitting and receiving a signal.

Background

In the current communication system, Time Division Duplex (TDD) is a mainstream and widely used multi-carrier modulation technique. In TDD mode, multiple signals may be multiplexed for transmission within the same time period resource.

In the TDD mode, the frequency domain out-of-band leakage of the multiplexed signals multiplexing the same time resource is high. To address this problem, the transmitter filters each signal prior to transmission, which may reduce the frequency domain out-of-band leakage of the signal. However, in the filtering process, a filtering tail signal is added before and after each path of signal, so that the time length of each path of signal after filtering is different, and how to send each path of signal with different time length is an urgent problem to be solved at present.

Disclosure of Invention

In order to solve the problems in the prior art, embodiments of the present invention provide a method and an apparatus for transmitting and receiving a signal. The technical scheme is as follows:

in a first aspect, a method for transmitting a signal is provided, the method including:

modulating each path of data to be transmitted in m paths of data to be transmitted respectively to obtain m paths of signals to be transmitted, wherein m is an integer greater than 1; each path of signals to be sent in the m paths of signals to be sent occupies a section of continuous time resource and frequency resource; the time resources occupied by each path of signals to be transmitted are overlapped and not completely the same; each path of signals to be transmitted occupies continuous frequency resources and is not overlapped;

performing signal superposition on the m paths of signals to be sent to form a path of superposed signals, wherein the initial position of at least one path of signals to be sent in the superposed signals is later than the initial position of the superposed signals and/or the end position of at least one path of signals to be sent in the superposed signals is earlier than the end position of the superposed signals;

and sending the superposed signal.

In the first aspect, since multiple paths of signals to be transmitted occupying time resources of different lengths are superimposed into one path of superimposed signal, and the superimposed signal is transmitted, the problem of how to transmit each path of signals of different time lengths is solved.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the performing signal superposition on the m channels of signals to be transmitted to form a channel of superposed signals includes:

filtering each path of signals to be sent in the m paths of signals to be sent, wherein the front and the back of each path of signals to be sent after filtering comprise filtering trailing signals;

according to the frequency resources occupied by each filtered signal to be sent, completely or partially truncating the filtered tail signal included by each filtered signal to be sent, wherein the time resources occupied by each truncated signal to be sent are the same;

and superposing the cut signals to be transmitted together to form a superposed signal.

In a first possible implementation manner of the first aspect, the filtered tail signal included in each path of filtered signals to be sent is completely or partially truncated, so that the filtered tail signal can be removed by complete truncation, and the length of the filtered tail signal can be reduced by partial truncation, thereby reducing the overhead of the filtered tail signal on time resources.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the performing, according to the frequency resource occupied by each filtered signal to be transmitted, complete or partial truncation on a filtered tail signal included in each filtered signal to be transmitted respectively includes:

if the bandwidth of the frequency resource occupied by the filtered nth signal to be sent is greater than or equal to a preset threshold, completely truncating a filtered tail signal included by the filtered nth signal to be sent, wherein n is 1 and 2 … … m;

and if the bandwidth of the frequency resource occupied by the filtered nth signal to be sent is smaller than a preset threshold value, performing partial truncation on a filtered tail signal included in the filtered nth signal to be sent.

In a second possible implementation manner of the first aspect, since a bandwidth of a frequency resource occupied by the filtered nth to-be-transmitted signal is greater than or equal to a preset threshold, performing complete truncation on the filtered tail signal may completely eliminate time resource overhead caused by the filtered tail signal. Or, since the bandwidth of the frequency resource occupied by the filtered nth signal to be transmitted is smaller than the preset threshold, the filtered tail signal is partially truncated, and the time domain resource overhead of the time interval can be reduced under the condition of ensuring that the influence on the system performance is small.

With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect,

and the length of the time resource occupied by each path of signal to be transmitted is less than or equal to the length of the superposed signal.

In a third possible implementation manner of the first aspect, since the length of the time resource occupied by each channel of signals to be transmitted is less than or equal to the length of the superimposed signal, it is ensured that effective data loss is avoided in the superimposing process.

With reference to the second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect,

and time resources between the starting position of the superposed signal and the starting position of the n-th channel of signals to be transmitted which are subjected to partial truncation and time resources between the ending position of the superposed signal and the ending position of the n-th channel of signals to be transmitted which are subjected to partial truncation are used for accommodating residual filtering tail signals generated after partial truncation.

In a fourth possible implementation manner of the first aspect, the residual filtered tail signal is contained before and after the nth signal to be transmitted, so that the influence on the system performance can be reduced.

With reference to the first aspect, in a fifth possible implementation manner of the first aspect, at least one of the m signals to be transmitted includes a synchronization signal.

In a fifth possible implementation manner of the first aspect, by including the synchronization signal, the receiver is enabled to acquire the synchronization timing of the demodulation superimposed signal according to the synchronization signal.

With reference to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect,

and one path of signals to be transmitted, which occupies a frequency resource greater than or equal to a preset threshold value, of the m paths of signals to be transmitted includes a synchronization signal.

In a sixth possible implementation manner of the first aspect, the signal to be transmitted, which occupies a frequency resource greater than or equal to the preset threshold, includes a synchronization signal, so that the influence on the synchronization signal is reduced during transmission, and it is ensured that a receiver can accurately detect the synchronization signal.

With reference to the first aspect, in a seventh possible implementation manner of the first aspect,

and one path of signals to be sent in the m paths of signals to be sent simultaneously comprises a synchronous signal and time information, and the time information is used for a receiver to acquire time deviation between the effective data initial positions of the one path of signals to be sent and other m-1 paths of signals to be sent respectively.

In a seventh possible implementation manner of the first aspect, the receiver is ensured to acquire the synchronization timing for demodulating the superimposed signal according to the time information included in the received superimposed signal.

In a second aspect, a method of receiving a signal is provided, the method comprising:

receiving a superposed signal, wherein the superposed signal comprises m paths of signals, m is an integer greater than 1, the starting position of at least one path of signal in the superposed signal is later than the starting position of the superposed signal and/or the ending position of at least one path of signal in the superposed signal is earlier than the ending position of the superposed signal;

and extracting effective data from the superposed signals.

In the second aspect, the received superimposed signal is formed by superimposing multiple paths of signals to be transmitted that occupy time resources of different lengths, so that the problem of how to transmit each path of signals of different time lengths is solved.

With reference to the second aspect, in a first possible implementation manner of the second aspect, a length of a time resource occupied by each path of signal is less than or equal to a length of the superimposed signal.

In a first possible implementation manner of the second aspect, since the length of the time resource occupied by each path of signal is less than or equal to the length of the superimposed signal, it is ensured that effective data loss is avoided in the superimposing process.

With reference to the second aspect or the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect,

if the bandwidth of the frequency resource occupied by the nth signal is greater than or equal to a preset threshold, the nth signal does not include a filtering tail signal, and n is 1 and 2 … … m;

and if the bandwidth of the frequency resource occupied by the nth path of signal is less than a preset threshold value, the nth path of signal comprises a partial filtering trailing signal.

In a second possible implementation manner of the second aspect, since the bandwidth of the frequency resource occupied by the nth path of signal is greater than or equal to the preset threshold, the path of signal does not include the filtering tail signal, and the time resource overhead caused by the filtering tail signal can be completely eliminated. Or, since the bandwidth of the frequency resource occupied by the nth signal is smaller than the preset threshold, the nth signal may include a partially filtered tail signal, and the time domain resource overhead of the time interval may be reduced under the condition of ensuring that the influence on the system performance is small.

With reference to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect,

and time resources between the starting position of the superimposed signal and the starting position of the nth signal to be transmitted including the partial filtering tail signal or time resources between the ending position of the superimposed signal and the ending position of the nth signal to be transmitted including the partial filtering tail signal are used for accommodating residual filtering tail signals generated after partial truncation.

In a third possible implementation manner of the second aspect, the residual filtered tail signal is accommodated before and after the nth signal, so that the influence on the system performance can be reduced.

With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the extracting valid data from the superimposed signal includes:

acquiring the synchronous timing of a first path of signal, wherein the first path of signal is a path of signal of the m paths of signals including synchronous signals;

acquiring the synchronous timing of a second path of signals according to the synchronous timing of the first path of signals and the time deviation between the effective data starting positions of the first path of signals and the second path of signals, wherein the second path of signals is other paths of signals except the first path of signals in the m paths of signals;

and acquiring effective data in the second path of signals according to the synchronous timing of the second path of signals.

In the second aspect, the synchronization timing of the second path of signal is obtained according to the synchronization timing of the first path of signal and the time deviation between the effective data starting positions of the first path of signal and the second path of signal, so that the accuracy of obtaining the synchronization timing of the second path of signal is improved.

With reference to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the first path of signal includes a synchronization signal;

the acquiring of the synchronization timing of the first path of signal includes:

and detecting the time position of a synchronous signal included in the first path of signal, and determining the synchronous timing of the first path of signal according to the time position.

In a fifth possible implementation manner of the second aspect, the first path of signal includes a synchronization signal, so that the accuracy of obtaining the synchronization timing of the first path of signal is improved according to the synchronization signal.

With reference to the fourth possible implementation manner of the second aspect, in a sixth possible implementation manner of the second aspect, before the acquiring the synchronization timing of the second path of signal, the method further includes:

extracting time information from the first path of signal, and acquiring a time deviation between effective data starting positions of the first path of signal and the second path of signal according to the time information, or acquiring a preset time deviation between effective data starting positions of the first path of signal and the second path of signal.

In a sixth possible implementation manner of the second aspect, since the time signal is extracted from the first path of signal to obtain the preset time offset, the accuracy of obtaining the time offset can be improved, so that the precision of obtaining the synchronization timing of the second path of signal is improved according to the time offset.

In a third aspect, an apparatus for transmitting a signal is provided, the apparatus comprising: a processing unit and a transmitting unit;

the processing unit is configured to modulate each channel of data to be sent in m channels of data to be sent, to obtain m channels of signals to be sent, where m is an integer greater than 1; each path of signals to be sent in the m paths of signals to be sent occupies a section of continuous time resource and frequency resource; the time resources occupied by each path of signals to be transmitted are overlapped and not completely the same; each path of signals to be transmitted occupies continuous frequency resources and is not overlapped;

the processing unit is further configured to perform signal superposition on the m channels of signals to be sent to form a channel of superposed signals, where at least one channel of signals to be sent has a starting position in the superposed signals later than a starting position of the superposed signals and/or at least one channel of signals to be sent has an ending position in the superposed signals earlier than an ending position of the superposed signals;

the sending unit is used for sending the superposed signal.

In the third aspect, since multiple paths of signals to be transmitted occupying time resources of different lengths are superimposed into one path of superimposed signal, and the superimposed signal is transmitted, the problem of how to transmit each path of signals of different time lengths is solved.

With reference to the third aspect, in a first possible implementation manner of the third aspect,

the processing unit is configured to filter each of the m channels of signals to be transmitted, where each of the filtered signals to be transmitted includes a filtered tail signal; according to the frequency resources occupied by each filtered signal to be sent, completely or partially truncating the filtered tail signals included before and after each filtered signal to be sent, wherein the time resources occupied by each truncated signal to be sent are the same; and superposing the cut signals to be transmitted together to form a superposed signal.

In a first possible implementation manner of the third aspect, the filtered tail signal included in each path of filtered signals to be sent is completely or partially truncated, so that the filtered tail signal can be removed by complete truncation, and the length of the filtered tail signal can be reduced by partial truncation, thereby reducing the overhead of the filtered tail signal on time resources.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect,

the processing unit is configured to perform complete truncation on a filtered tail signal included in the filtered nth signal to be sent if a bandwidth of a frequency resource occupied by the filtered nth signal to be sent is greater than or equal to a preset threshold, where n is 1 and 2 … … m; and if the bandwidth of the frequency resource occupied by the filtered nth signal to be sent is smaller than a preset threshold value, performing partial truncation on a filtered tail signal included in the filtered nth signal to be sent.

In a second possible implementation manner of the third aspect, since a bandwidth of a frequency resource occupied by the filtered nth to-be-transmitted signal is greater than or equal to a preset threshold, performing complete truncation on the filtered tail signal may completely eliminate time resource overhead caused by the filtered tail signal. Or, since the bandwidth of the frequency resource occupied by the filtered nth signal to be transmitted is smaller than the preset threshold, the filtered tail signal is partially truncated, and the time domain resource overhead of the time interval can be reduced under the condition of ensuring that the influence on the system performance is small.

Optionally, in the third aspect, any possible implementation manner of the third to seventh aspects of the first aspect may also be included.

In a fourth aspect, an apparatus for receiving a signal is provided, the apparatus comprising: a receiving unit and a processing unit;

the receiving unit is used for receiving a superimposed signal, wherein the superimposed signal comprises m paths of signals, m is an integer greater than 1, and the starting position of at least one path of signal in the superimposed signal is later than the starting position of the superimposed signal and/or the ending position of at least one path of signal in the superimposed signal is earlier than the ending position of the superimposed signal;

the processing unit is used for extracting effective data from the superposed signals.

In the fourth aspect, the received superimposed signal is formed by superimposing multiple paths of signals to be transmitted that occupy time resources of different lengths, so that the problem of how to transmit each path of signals of different time lengths is solved.

Optionally, in a fourth aspect, any possible implementation manner of the first to third aspects of the second aspect may also be included.

With reference to the fourth aspect, in a fourth possible implementation manner of the fourth aspect,

the processing unit is configured to acquire synchronization timing of a first channel of signals, where the first channel of signals is a channel of signals including synchronization signals among the m channels of signals; acquiring the synchronous timing of a second path of signals according to the synchronous timing of the first path of signals and the time deviation between the effective data starting positions of the first path of signals and the second path of signals, wherein the second path of signals is other paths of signals except the first path of signals in the m paths of signals; and acquiring effective data in the second path of signals according to the synchronous timing of the second path of signals.

In a fourth possible implementation manner of the fourth aspect, the synchronization timing of the second path of signal is obtained according to the synchronization timing of the first path of signal and the time deviation between the start positions of the valid data of the first path of signal and the second path of signal, so that the accuracy of obtaining the synchronization timing of the second path of signal is improved.

With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the first path of signal includes a synchronization signal;

the processing unit is configured to detect a time position of a synchronization signal included in the first channel of signal, and determine synchronization timing of the first channel of signal according to the time position.

In a fifth possible implementation manner of the fourth aspect, the first path of signal includes a synchronization signal, so that the precision of obtaining the synchronization timing of the first path of signal is improved according to the synchronization signal.

With reference to the fourth possible implementation manner of the fourth aspect, in a sixth possible implementation manner of the fourth aspect,

the processing unit is further configured to extract time information from the first path of signal, and obtain a time offset between start positions of valid data of the first path of signal and the second path of signal according to the time information, or obtain a preset time offset between start positions of valid data of the first path of signal and the second path of signal.

In a sixth possible implementation manner of the fourth aspect, since the time signal is extracted from the first path of signal to obtain the preset time offset, the accuracy of obtaining the time offset can be improved, so that the precision of obtaining the synchronization timing of the second path of signal is improved according to the time offset.

In a fifth aspect, there is provided an apparatus for transmitting a signal, the apparatus comprising: a processor and a transmitter;

the processor is configured to modulate each channel of data to be sent in the m channels of data to be sent, respectively, to obtain m channels of signals to be sent, where m is an integer greater than 1; each path of signals to be sent in the m paths of signals to be sent occupies a section of continuous time resource and frequency resource; the time resources occupied by each path of signals to be transmitted are overlapped and not completely the same; each path of signals to be transmitted occupies continuous frequency resources and is not overlapped;

the processor is further configured to perform signal superposition on the m channels of signals to be sent to form a channel of superposed signals, where at least one channel of signals to be sent has a starting position in the superposed signals later than a starting position of the superposed signals and/or at least one channel of signals to be sent has an ending position in the superposed signals earlier than an ending position of the superposed signals;

the transmitter is used for transmitting the superposed signal.

In the fifth aspect, since multiple paths of signals to be transmitted occupying time resources of different lengths are superimposed into one path of superimposed signal, and the superimposed signal is transmitted, the problem of how to transmit each path of signals of different time lengths is solved.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect,

the processor is configured to filter each of the m channels of signals to be transmitted, where each of the filtered signals to be transmitted includes a filtered tail signal; according to the frequency resources occupied by each filtered signal to be sent, completely or partially truncating the filtered tail signals included before and after each filtered signal to be sent, wherein the time resources occupied by each truncated signal to be sent are the same; and superposing the cut signals to be transmitted together to form a superposed signal.

In a first possible implementation manner of the fifth aspect, the filtered tail signal included before and after each path of filtered signals to be transmitted is completely or partially truncated, the filtered tail signal can be removed by complete truncation, and the length of the filtered tail signal can be reduced by partial truncation, so that the overhead of the filtered tail signal on time resources is reduced.

With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect,

the processor is configured to perform complete truncation on a filtered tail signal included in the filtered nth signal to be transmitted if a bandwidth of a frequency resource occupied by the filtered nth signal to be transmitted is greater than or equal to a preset threshold, where n is 1 and 2 … … m; and if the bandwidth of the frequency resource occupied by the filtered nth signal to be sent is smaller than a preset threshold value, performing partial truncation on a filtered tail signal included in the filtered nth signal to be sent.

In a second possible implementation manner of the fifth aspect, since a bandwidth of a frequency resource occupied by the filtered nth signal to be transmitted is greater than or equal to a preset threshold, performing complete truncation on the filtered tail signal may completely eliminate time resource overhead caused by the filtered tail signal. Or, since the bandwidth of the frequency resource occupied by the filtered nth signal to be transmitted is smaller than the preset threshold, the filtered tail signal is partially truncated, and the time domain resource overhead of the time interval can be reduced under the condition of ensuring that the influence on the system performance is small.

Optionally, in the fifth aspect, any possible implementation manner of the third to seventh aspects of the first aspect may also be included.

In a sixth aspect, an apparatus for receiving a signal is provided, the apparatus comprising: a receiver and a processor;

the receiver is used for receiving a superposed signal, wherein the superposed signal comprises m paths of signals, m is an integer greater than 1, the starting position of at least one path of signal in the superposed signal is later than the starting position of the superposed signal and/or the ending position of at least one path of signal in the superposed signal is earlier than the ending position of the superposed signal;

the processor is used for extracting effective data from the superposed signals.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect,

the processor is configured to obtain a synchronization timing of a first channel of signals, where the first channel of signals is a channel of signals including synchronization signals among the m channels of signals; acquiring the synchronous timing of a second path of signals according to the synchronous timing of the first path of signals and the time deviation between the effective data starting positions of the first path of signals and the second path of signals, wherein the second path of signals is other paths of signals except the first path of signals in the m paths of signals; and acquiring effective data in the second path of signals according to the synchronous timing of the second path of signals.

In a first possible implementation manner of the sixth aspect, the synchronization timing of the second path of signal is obtained according to the synchronization timing of the first path of signal and the time deviation between the start positions of the valid data of the first path of signal and the second path of signal, so that the accuracy of obtaining the synchronization timing of the second path of signal is improved.

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the first path of signal includes a synchronization signal;

the first path of signal comprises a synchronous signal;

the processor is configured to detect a time position of a synchronization signal included in the first channel of signal, and determine synchronization timing of the first channel of signal according to the time position.

In a second possible implementation manner of the sixth aspect, the first path of signal includes a synchronization signal, so that the accuracy of obtaining the synchronization timing of the first path of signal is improved according to the synchronization signal.

With reference to the first possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect,

the processor is further configured to extract time information from the first path of signal, and obtain a time offset between start positions of valid data of the first path of signal and the second path of signal according to the time information, or obtain a preset time offset between start positions of valid data of the first path of signal and the second path of signal.

In a third possible implementation manner of the sixth aspect, since the time signal is extracted from the first path of signal to obtain the preset time offset, the accuracy of obtaining the time offset can be improved, so that the precision of obtaining the synchronization timing of the second path of signal is improved according to the time offset.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1-1 is a schematic diagram of a transmitter process of f-OFDM provided by an embodiment of the present invention;

fig. 1-2 are schematic diagrams of a network architecture according to an embodiment of the present invention;

fig. 2-1 is a schematic structural diagram of a transmitter according to an embodiment of the present invention;

fig. 2-2 is a schematic structural diagram of a receiver according to an embodiment of the present invention;

fig. 3-1 is a flow chart of a method for transmitting signals according to an embodiment of the present invention;

fig. 3-2 is a schematic diagram of a filtering process provided by an embodiment of the invention;

3-3 are diagrams of time domain impulse response waveforms of a filter according to an embodiment of the present invention;

fig. 3-4 are schematic diagrams illustrating uplink and downlink inter-switching provided in the embodiment of the present invention;

fig. 3-5 are schematic structural diagrams of a superimposed signal according to an embodiment of the present invention;

3-6 are diagrams of embodiments of the present invention providing a method for including a synchronization signal in a signal;

fig. 4 is a flowchart of a method for receiving a signal according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an apparatus for transmitting signals according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an apparatus for receiving a signal according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The basic principle of the filtering Orthogonal Frequency Division multiplexing (f-OFDM) is that a carrier is divided into different segments of Frequency resources, which may be sub-bands, each sub-band is filtered, and a certain guard band is reserved at the edge of the sub-band, so that the sub-bands are uncorrelated and do not affect each other. The bandwidth of each sub-band may be different, and the bandwidth of the sub-band is determined according to the service requirement.

Fig. 1-1 is a simplified block diagram of the f-OFDM process. As shown in fig. 1, a carrier is divided into N subbands, each subband occupies a certain bandwidth, data of each subband is independently processed, configuration information of each subband may be different, and finally, each subband is separately filtered, superimposed, and transmitted on an air interface. The physical layer basic parameters (numerology) of different subbands may be the same or different. The physical layer basic parameter of a sub-band includes at least one of sub-carrier bandwidth, Transmission Time Interval (TTI) length, symbol number, and Cyclic Prefix (CP) length. The physical layer basic parameters of the sub-band can be configured in advance, and can also be flexibly adapted according to the conditions of service load and the like. Generally, the sub-bands configured by the basic parameters of different physical layers are suitable for different service types. The physical layer basic parameters of the sub-bands in the embodiments of the present invention may be different from one or more of the parameters such as the sub-carrier bandwidth, the transmission time interval length, the symbol number, and the cyclic prefix length, for example: the TTIs for different sub-bands are different.

The F-OFDM technique divides the frequency spectrum into multiple subbands. A subband in F-OFDM may be a certain bandwidth with parameters (numerology) of the same subband, or a set of subcarriers with parameters of the same subband. Each subband may contain multiple subcarriers. The parameters (numerology) of different subbands may be the same or different. The parameters of the sub-band comprise at least one of the parameters of sub-carrier bandwidth, transmission time interval length, symbol number, cyclic prefix length and the like. The parameters of the sub-band can be configured in advance, and can also be flexibly adapted according to the condition of the service load. Different types of traffic types may use different subbands.

Referring to fig. 1-2, fig. 1-2 are diagrams of network architectures applied by the embodiments of the present invention, where the network architecture includes a transmitter 100 and a receiver 200, and the transmitter may encapsulate multiple channels of data to be transmitted into a superimposed signal and transmit the superimposed signal to the receiver; the receiver may receive the superimposed signal, demodulate one or more paths of effective data from the superimposed signal, and implement the detailed implementation process, see the subsequent embodiments in the drawings, which are not described in detail herein.

Referring to fig. 2-1, fig. 2-1 is a block diagram of the transmitter 100, where the transmitter 100 may have a relatively large difference due to different configurations or performances, and may include one or more processors 101 and a transmitter 102;

the processor 101 may be configured to perform the above-mentioned operation of encapsulating multiple channels of data to be transmitted into one channel of superimposed signals.

The transmitter 102 may be configured to perform the operations described above for transmitting the superimposed signal to a receiver.

Optionally, the transmitter 100 may include other components in addition to the processor 101 and the transmitter 102 described above. For example, memory 103, one or more storage media 106 (e.g., one or more mass storage devices) that store applications 104 or data 105 may also be included. Memory 103 and storage medium 106 may be, among other things, transient or persistent storage. The program stored on the storage medium 106 may include one or more modules (not shown), each of which may include a sequence of instructions for operating on the transmitter 100. Further, the processor 101 may be configured to communicate with the storage medium 106 to execute a series of instruction operations in the storage medium 106 on the transmitter 100.

Transmitter 100 may also include one or more power supplies 107, one or more wired or wireless network interfaces 108, one or more input-output interfaces 109, one or more keyboards 110, and/or one or more operating systems 111, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, etc.

The processor 101 and the transmitter 102 of the transmitter 100 may also have the following functions in the present invention:

the processor 101 is configured to modulate each channel of data to be sent in m channels of data to be sent, respectively, to obtain m channels of signals to be sent, where m is an integer greater than 1; each path of signals to be sent in the m paths of signals to be sent occupies a section of continuous time resource and frequency resource; the time resources occupied by each path of signals to be transmitted are overlapped and not completely the same; each path of signals to be transmitted occupies continuous frequency resources and is not overlapped;

the processor 101 is further configured to perform signal superposition on the m channels of signals to be transmitted to form a channel of superposed signals, where at least one channel of signals to be transmitted has a starting position in the superposed signals later than a starting position of the superposed signals and/or at least one channel of signals to be transmitted has an ending position in the superposed signals earlier than an ending position of the superposed signals;

the transmitter 102 is configured to transmit the superimposed signal.

Optionally, the processor 101 is configured to filter each of the m channels of signals to be transmitted, where each of the filtered signals to be transmitted includes a filtered tail signal; according to the frequency resources occupied by each filtered signal to be sent, completely or partially truncating the filtered tail signals included before and after each filtered signal to be sent, wherein the time resources occupied by each truncated signal to be sent are the same; and superposing the cut signals to be transmitted together to form a superposed signal.

Optionally, the processor 101 is configured to perform complete truncation on a filtered tail signal included in the filtered nth signal to be sent if a bandwidth of a frequency resource occupied by the filtered nth signal to be sent is greater than or equal to a preset threshold, where n is 1 and 2 … … m; and if the bandwidth of the frequency resource occupied by the filtered nth signal to be sent is smaller than a preset threshold value, performing partial truncation on a filtered tail signal included in the filtered nth signal to be sent.

Optionally, the length of the time resource occupied by each channel of signals to be transmitted is less than or equal to the length of the superimposed signal.

Optionally, in the n-th signal to be transmitted after the partial truncation, a time resource between a start position of the superimposed signal and a start position of the n-th signal to be transmitted and a time resource between an end position of the superimposed signal and an end position of the n-th signal to be transmitted are used for accommodating a residual filtering tail signal generated after the partial truncation.

Optionally, at least one of the m signals to be transmitted includes a synchronization signal.

Optionally, a certain channel of signals to be transmitted, which occupies a frequency resource greater than or equal to a preset threshold value, among the m channels of signals to be transmitted includes a synchronization signal.

Optionally, a certain one of the m channels of signals to be transmitted simultaneously includes a synchronization signal and time information, where the time information is used for a receiver to obtain time deviations between effective data start positions of the one channel of signals to be transmitted and other m-1 channels of signals to be transmitted, respectively.

In the embodiment of the invention, because the multiple paths of signals to be sent occupying time resources with different lengths are superposed into one path of superposed signal and then the superposed signal is sent, the problem of how to send each path of signals with different time lengths is solved; in addition, the filtering tail signals included before and after each path of filtered signals to be sent are completely or partially truncated, the filtering tail signals can be removed through complete truncation, the length of the filtering tail signals can be reduced through partial truncation, and therefore the cost of the filtering tail signals on time resources is reduced.

Referring to fig. 2-2, fig. 2-2 is a block diagram of the receiver 200, where the receiver 200 may have a relatively large difference due to different configurations or performances, and may include a receiver 201 and one or more processors 202;

the receiver 201 is used for the above operation of receiving the superimposed signal;

the processor 202 is configured to demodulate one or more effective data from the superimposed signal.

Optionally, the receiver 200 may include other components besides the receiver 201 and the processor 202 described above. For example, memory 203, one or more storage media 206 (e.g., one or more mass storage devices) that store applications 204 or data 205 may also be included. Memory 203 and storage media 206 may be, among other things, transient or persistent storage. The program stored on the storage medium 206 may include one or more modules (not shown), each of which may include a sequence of instruction operations for the receiver 200. Further, the processor 202 may be configured to communicate with the storage medium 206 to execute a series of instruction operations in the storage medium 206 on the receiver 200.

Receiver 200 may also include one or more power supplies 207, one or more wired or wireless network interfaces 208, one or more input-output interfaces 209, one or more keyboards 210, and/or one or more operating systems 211, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, and so forth.

The receiver 201 and the processor 202 of the receiver 200 in the present invention may also have the following functions:

the receiver 201 is configured to receive a superimposed signal, where the superimposed signal includes m channels of signals, m is an integer greater than 1, and a start position of at least one channel of signal in the superimposed signal is later than a start position of the superimposed signal and/or an end position of at least one channel of signal in the superimposed signal is earlier than an end position of the superimposed signal;

the processor 202 is configured to extract valid data from the superimposed signal.

Optionally, the length of the time resource occupied by each path of signal is less than or equal to the length of the superimposed signal.

Optionally, if the bandwidth of the frequency resource occupied by the nth signal is greater than or equal to a preset threshold, the nth signal does not include the filtered tail signal, where n is 1 and 2 … … m;

Optionally, time resources between a start position of the superimposed signal and a start position of the nth signal to be transmitted including the partially filtered tail signal or time resources between an end position of the superimposed signal and an end position of the nth signal to be transmitted including the partially filtered tail signal are used for accommodating a residual filtered tail signal generated after partial truncation.

Optionally, the processor 202 is configured to obtain a synchronization timing of a first signal, where the first signal is a signal of the m signals that includes a synchronization signal; acquiring the synchronous timing of a second path of signals according to the synchronous timing of the first path of signals and the time deviation between the effective data starting positions of the first path of signals and the second path of signals, wherein the second path of signals is other paths of signals except the first path of signals in the m paths of signals; and acquiring effective data in the second path of signals according to the synchronous timing of the second path of signals.

Optionally, the first path of signal includes a synchronization signal;

the processor 202 is configured to detect a time position of a synchronization signal included in the first path of signal, and determine synchronization timing of the first path of signal according to the time position.

Optionally, the processor 202 is further configured to extract time information from the first path of signal, and obtain a time offset between start positions of valid data of the first path of signal and the second path of signal according to the time information, or obtain a preset time offset between start positions of valid data of the first path of signal and the second path of signal.

In the embodiment of the invention, the synchronous timing of the second path of signal is obtained according to the synchronous timing of the first path of signal and the time deviation between the effective data starting positions of the first path of signal and the second path of signal, so that the precision of obtaining the synchronous timing of the second path of signal is improved.

Example 3

Referring to fig. 3-1, an embodiment of the present invention provides a method for transmitting a signal, including:

step 301: the transmitter modulates each path of data to be transmitted in m paths of data to be transmitted respectively to obtain m paths of signals to be transmitted, wherein m is an integer greater than 1.

Each path of signals to be transmitted in the m paths of signals to be transmitted occupies a section of continuous time resources and frequency resources, the time resources occupied by each path of signals to be transmitted are overlapped and not completely the same, and the frequency resources occupied by each path of signals to be transmitted are continuous and are not overlapped.

In this embodiment, a section of frequency resources occupied by a signal to be transmitted may be a subband, that is, a section of continuous frequency resources, for example, frequency resources with a bandwidth of 30Hz to 100Hz may form a subband, and the subband corresponds to one or more subcarriers.

The method comprises the following steps: the transmitter maps the m paths of data to be sent to one or more subcarriers corresponding to the m frequency resources respectively; performing Inverse Fast Fourier Transform (IFFT) operation on the mapped m paths of data to be transmitted respectively; adding Cyclic prefixes (Cyclic prefixes, CPs) to the m paths of data to be transmitted after conversion respectively to form m paths of OFDM symbol sequences, wherein the m paths of OFDM symbol sequences are m paths of signals to be transmitted, and each path of OFDM symbol sequence comprises at least one OFDM symbol.

For example, referring to fig. 1-1, assume that there are three frequency resources, frequency resource 1, frequency resource 2, and frequency resource 3, and frequency resource 1, frequency resource 2, and frequency resource 3 are consecutive and do not overlap. The transmitter maps data 1 to be transmitted, data 2 to be transmitted and data 3 to be transmitted to subcarrier 1 corresponding to frequency resource 1, subcarrier 2 corresponding to frequency resource 2 and subcarrier 3 corresponding to frequency resource 3 respectively, performs IFFT operation on the mapped data 1, data 2 and data 3 respectively, adds CP1 to the transformed data 1 to obtain OFDM symbol sequence 1, adds CP2 to the transformed data 2 to obtain OFDM symbol sequence 2, and adds CP3 to the transformed data 3 to obtain OFDM symbol sequence 3, i.e. to obtain 3 paths of signals to be transmitted, which are signals 1, 2 and 3 to be transmitted respectively.

Among them, it should be noted that: each path of signals to be sent obtained by mapping in the step has higher frequency domain out-of-band leakage. In order to reduce the out-of-band leakage of the frequency domain of each channel of signals to be transmitted, each channel of signals to be transmitted is filtered through the following step 302.

Step 302: the transmitter filters each path of signals to be transmitted in the m paths of signals to be transmitted, and the front and the back of each path of signals to be transmitted after filtering comprise filtering tail signals.

The method comprises the following steps: the transmitter selects a filter corresponding to each path of signals to be transmitted according to the bandwidth of the frequency resource occupied by each path of signals to be transmitted, and filters each path of signals to be transmitted by using the filter corresponding to each path of signals to be transmitted; for each channel of signals to be transmitted, when the filter corresponding to the signals to be transmitted filters the signals to be transmitted, a filtering tail signal is formed before and after the signals to be transmitted.

For example, diagram (a) in fig. 3-2 is a certain signal to be transmitted. Referring to diagram (b) in fig. 3-2, after the transmitter filters the channel of signal to be transmitted by using the filter, a filtered tail signal is formed before and after the channel of signal to be transmitted. In this example, the length of the front-filtered tail signal formed before the path of signal to be transmitted and the length of the rear-filtered tail signal formed after the path of signal to be transmitted are identical.

The strategy for the transmitter to select the corresponding filter for each channel of signals to be transmitted is as follows: if the bandwidth of the frequency resource occupied by the channel of signals to be transmitted is larger, the passband width of the filter selected for the channel of signals to be transmitted is correspondingly larger; if the bandwidth of the frequency resource occupied by the channel of signals to be transmitted is smaller, the passband width of the filter selected for the channel of signals to be transmitted is correspondingly smaller.

When the filter with wider passband width filters the path of signals to be transmitted, the time domain energy diffusion of the filter is small. In this case, the part of the filter to which the energy is not negligible is short both in the front-filtered tail signal added before the path of signal to be transmitted and in the rear-filtered tail signal added after the path of signal to be transmitted. Therefore, the larger the bandwidth of the frequency resource occupied by the path of signals to be transmitted is, the shorter the length of the front and rear filtering tail signals included in the filtered path of signals to be transmitted is. The filter with a narrow passband width has a large time domain energy spread, and when the path of signal to be transmitted is filtered, the filter has a long part with non-negligible energy in the front-filtered tail signal added before the path of signal to be transmitted and the back-filtered tail signal added after the path of signal to be transmitted. Therefore, the smaller the bandwidth of the frequency resource occupied by the path of signals to be transmitted, the longer the length of the front and rear filtering tail signals included in the filtered path of signals to be transmitted.

For example, referring to fig. 3-3, diagram (a) uses a filter with a passband width of 18MHz to filter a channel of signals to be transmitted. The filter has larger pass band width and smaller energy diffusion. The filtered tail signal formed in the filtered signal to be transmitted comprises 1541, 1542, 1543, 1544 and 1545 and other sampling points, and the part of the filtered tail signal with non-negligible energy is shorter; and (b) filtering the channel of signals to be transmitted by using a filter with the passband width of 720kHz, wherein the passband width of the filter is small and the energy spread is large. The filtered tail signal formed in the filtered signal to be transmitted comprises 1500-1600 sampling points, and the part of the filtered tail signal with non-negligible energy is longer.

This step is described in detail with the signals 1, 2 and 3 to be transmitted in fig. 1-1, as follows: the transmitter selects a filter 1 according to the bandwidth of a frequency resource 1 occupied by a signal 1 to be transmitted, and filters the signal 1 to be transmitted through the filter 1 to obtain a filtered signal 1 to be transmitted; selecting a filter 2 according to the bandwidth of the frequency resource 2 occupied by the signal 2 to be transmitted, and filtering the signal 2 to be transmitted through the filter 2 to obtain the filtered signal 2 to be transmitted; and selecting a filter 3 according to the bandwidth of the frequency resource 3 occupied by the signal 3 to be transmitted, and filtering the signal 3 to be transmitted through the filter 3 to obtain the filtered signal 3 to be transmitted.

For each of the obtained filtered signals to be transmitted, since the front and the back of the filtered signals to be transmitted include the filtered tail signals, the time length of the filtered signals to be transmitted is greater than the time length of the filtered signals to be transmitted. In addition, in a Time-division Duplex (TDD) mode of a Long-term Evolution cellular communication system (Long-term Evolution, 4G LTE), in order to avoid interference of Uplink transmission of a near-end User Equipment (UE) on Downlink reception of a far-end UE, the system reserves a certain Guard Gap (GP) in a switching Time from Downlink (DL) to Uplink (Uplink, UL) in a frame structure. If the filtered hangover signal generated by the filter is included completely in the frame structure and transmitted, such a frame structure will include a large amount of the filtered hangover signal, as shown in fig. 3-4. Under the scheme, if the bandwidth of the frequency resource occupied by the filtered signal to be transmitted is small, the duration of the filtered tail signal included in the filtered signal to be transmitted is long, which brings huge time resource overhead and cannot be accepted by the system.

In order to reduce the time resource overhead caused by transmitting the filtered tail signal, the following operations may be performed on the filtered signal to be transmitted.

Step 303: and the transmitter respectively and completely or partially truncates the filtering tail signals included before and after each filtered signal to be transmitted according to the frequency resources occupied by each filtered signal to be transmitted, and the time resources occupied by each truncated signal to be transmitted are the same.

The truncation of the filtered tail signal can be soft truncation by using a slowly-falling window function, and can also be hard truncation by using a steeply-falling window function.

The method comprises the following steps: acquiring bandwidth of frequency resources occupied by the filtered nth to-be-sent signal, and if the acquired bandwidth is greater than or equal to a preset threshold, completely cutting off filtered tail signals included before and after the filtered nth to-be-sent signal, wherein n is 1 and 2 … … m; and if the acquired bandwidth is smaller than a preset threshold value, performing partial truncation on the filtered tail signals included before and after the n-th path of signals to be transmitted after filtering.

For the n-th partially truncated signal to be transmitted, the header of the truncated n-th signal to be transmitted may or may not include a time interval. When included, the time interval is used to accommodate a residual front filtered tail signal in the truncated nth signal to be transmitted. The tail part of the truncated nth signal to be transmitted comprises a time interval, and the time interval is used for accommodating a post-filtered tail signal remained in the truncated nth signal to be transmitted.

If the head of the nth signal to be transmitted includes the control information, the transmitter may completely truncate the front filtered tail signal of the nth signal to be transmitted after filtering and truncate the rear filtered tail signal of the nth signal to be transmitted after filtering when the transmitter partially truncates the nth signal to be transmitted after filtering.

Among them, it should be noted that: if the head of the nth path of signal to be transmitted comprises the control information, the robustness of the signal is better, and a front filtering tail signal in the filtered nth path of signal to be transmitted is completely truncated, so that the influence on the system performance is smaller. Thus, the front filtered tail signal can be completely truncated to reduce time domain resource overhead.

Optionally, the operation of performing partial truncation on the filtered tail signal included before and after the filtered nth signal to be transmitted by the transmitter may be:

the transmitter determines a bandwidth range in which a bandwidth of a frequency resource occupied by the n-th path of signals to be transmitted after filtering is located, acquires a corresponding time interval from a corresponding relation between a preset bandwidth range and the time interval according to the bandwidth range, and performs partial truncation on a filtering tail signal included before and after the n-th path of signals to be transmitted after filtering according to the time interval.

Alternatively, besides the above-described method of partially or completely truncating the filtered tail signal, other methods may be used, for example, as follows:

and the transmitter performs partial or complete truncation on the filtered tail signal included in the n-th path of signals to be transmitted according to the time domain energy diffusion characteristic information of the filtered tail signal included in the n-th path of signals to be transmitted and preset system requirement information.

The time domain energy diffusion characteristic information may be lengths of front and rear filtered tail signals in the n-th channel to-be-transmitted signal after filtering, and the preset system requirement information may be a length of a preset maximum time interval.

Correspondingly, the process of partially or completely truncating the filtered tail signal of the n-th filtered signal to be transmitted according to the two pieces of information may be:

if the length of the filtered tail signal of the nth path of signals to be transmitted is less than or equal to the length of the maximum time interval, further judging the bandwidth of the frequency resource occupied by the filtered nth path of signals to be transmitted, and if the bandwidth is larger, for example, larger than a preset threshold, directly and completely cutting off the filtered tail signal of the filtered nth path of signals to be transmitted; if the bandwidth is smaller, for example, smaller than or equal to a preset threshold, the filtered tail signal of the n-th path of signals to be transmitted after filtering is not truncated; and if the length of the filtered tail signal of the nth signal to be transmitted is greater than the length of the maximum time interval after filtering, performing partial truncation on the filtered tail signal of the nth signal to be transmitted according to the length of the maximum time interval.

Among them, it should be noted that: completely truncating the filtered tail signal in the n-th filtered signal to be transmitted may bring a certain system performance loss. The shorter the filtered tail signal in the n-th path of signals to be transmitted is, the smaller the system performance loss caused by completely cutting off the filtered tail signal in the n-th path of signals to be transmitted. The longer the filtered tail signal in the n-th path of signals to be transmitted is, the greater the system performance loss caused by completely cutting off the filtered tail signal in the n-th path of signals to be transmitted. Therefore, under the condition that the condition allows, the trailing part truncation can be adopted, and the influence on the system performance is reduced. In this embodiment, the shorter filtered tail signal may be completely truncated or the longer filtered tail signal may be partially truncated, so as to reduce the time domain resource overhead of the time interval under the condition of ensuring that the influence on the system performance is small.

For another example, the filtered tail signal may be partially or completely truncated as follows:

if the frequency resource occupied by the filtered nth path of signals to be transmitted is a dominant subband, the transmitter completely truncates the filtered tail signals in the filtered nth path of signals to be transmitted; if the frequency resource occupied by the filtered nth path of signal to be transmitted is a slave subband, the transmitter truncates the part of the filtered tail signal in the filtered nth path of signal to be transmitted, so that the time length of the residual filtered tail signal in the truncated nth path of signal to be transmitted is the same as the time length of the time interval.

In the embodiment of the present invention, the frequency resource occupied by the signal to be transmitted may be a sub-band, where the sub-band is divided into a master sub-band and a slave sub-band, and a bandwidth of the master sub-band is greater than a bandwidth of the slave sub-band. The subband with the bandwidth larger than the preset threshold may be defined as a main subband or the subband with the largest bandwidth in the subbands occupied by each of the m channels of signals to be transmitted is determined as the main subband.

Optionally, if the frequency resource occupied by the filtered nth signal to be transmitted is a slave subband, the operation of the transmitter to partially truncate the filtered tail signal may be:

the transmitter determines a bandwidth range in which the bandwidth of the sub-band is located, and according to the bandwidth range in which the bandwidth of the sub-band is located, the time length of the corresponding time interval is obtained from the corresponding relation between the stored bandwidth range of the sub-band and the time length of the time interval, or the transmitter directly obtains the time length of the preset maximum time interval. And according to the acquired time length of the time interval, performing partial truncation on the filtered tail signal included in the n-th path of signals to be transmitted after filtering, so that the time length of the residual filtered tail signal in the n-th path of signals to be transmitted after truncation is the same as the time length of the acquired time interval.

Wherein the time interval may comprise a preceding time interval and a following time interval, and the preceding time interval and the following time interval may be equal or different. And the time length of the residual pre-filtering tail signal and the time length of the residual post-filtering tail signal in the n-th cut signal to be transmitted are the same as the time lengths of the corresponding front time interval and the corresponding back time interval.

For example, for the filtered signals 1, 2, and 3 to be transmitted obtained in step 302, referring to fig. 3-5, the bandwidth of frequency resource 1 is greater than the bandwidths of frequency resources 2 and 3, the bandwidth of frequency resource 1 is greater than the preset threshold, and the bandwidths of frequency resources 2 and 3 are less than the preset threshold. Therefore, the transmitter completely truncates the front filtered tail signal and the rear filtered tail signal included in the filtered signal to be transmitted 1, judges whether the head of the filtered signal to be transmitted 2 includes control information, the judgment result does not include the control information, the transmitter determines the lengths of the front time interval GI and the rear time interval GI, and then partially truncates the front filtered tail signal and the rear filtered tail signal of the filtered signal to be transmitted 2 according to the lengths of the front time interval and the rear time interval GI, so that the time length of the residual front filtered tail signal and the time length of the residual rear filtered tail signal in the partially truncated signal to be transmitted 2 are respectively equal to the time length of the front time interval GI and the time length of the rear time interval GI. The transmitter judges whether the head of the filtered signal 3 to be transmitted includes control information, and when the judgment result includes the control information, the transmitter completely truncates the front filtered tail signal of the filtered signal 3 to be transmitted, determines the length of the rear time interval GI, and partially truncates the rear filtered tail signal of the filtered signal 3 to be transmitted according to the length of the rear time interval GI, so that the time length of the rear filtered tail signal remaining in the signal 3 to be transmitted after partial truncation is equal to the time length of the rear time interval GI.

Step 304: the transmitter superposes each path of signals to be transmitted after partial truncation or complete truncation to form superposed signals, and transmits the superposed signals.

Among them, it should be noted that: at least one channel of signals to be transmitted including synchronization signals exists in the m channels of signals to be transmitted obtained in step 301. The synchronization channel in the channel to be transmitted may include a synchronization signal. The synchronization signal may be a preset synchronization signal or a synchronization signal predetermined by the transmitter and the receiver. The synchronization signal is used for the receiver to demodulate the effective data in the channel of signal to be transmitted.

Optionally, the signal to be transmitted may be a certain path of signal to be transmitted whose occupied bandwidth of the frequency resource is greater than or equal to a preset threshold, or a signal to be transmitted that is predetermined by the transmitter and the receiver.

Optionally, referring to fig. 3 to 6, the bandwidth of the frequency resource 1 occupied by the signal 1 to be transmitted is greater than or equal to the preset threshold, so that the synchronization signal may be included in the synchronization channel in the signal 1 to be transmitted.

Optionally, the channel of signals to be transmitted may further include time information, where the time information is used for the receiver to obtain time offsets between the effective data start positions of the channel of signals to be transmitted and the other m-1 channels of signals to be transmitted, respectively. Optionally, the time information may be included in a common control channel in the signal to be transmitted.

The transmitter and the receiver may agree on the time offset in advance, so that the time offset agreed in the receiver may be used, and the signal to be transmitted may not include the time information.

In addition, the other m-1 channels of signals to be transmitted may or may not include a synchronization signal.

In the embodiment of the invention, the cost of time resources brought by the filtering tail signal can be reduced by carrying out complete or partial truncation on the filtering tail signal in the filtered signal to be sent.

Example 4

The embodiment of the invention provides a method for receiving signals. Wherein the method is used for receiving the superposed signal transmitted by the transmitter through embodiment 3, referring to fig. 4, the method comprises:

step 401: the receiver receives a superimposed signal, wherein the superimposed signal comprises m channels of signals, and m is an integer greater than 1.

Step 402: and the receiver detects the time position of a synchronous signal included in the first path of signal, and acquires the synchronous timing of the first path of signal according to the time position, wherein the first path of signal is one path of signal in the m paths of signals.

The first path of signal may be a signal located on the main subband, a signal occupying a bandwidth of a frequency resource greater than or equal to a preset threshold, or a signal agreed by the receiver and the transmitter in advance, and the receiver may determine the first path of signal from the m paths of signals, for example, identify the first path of signal agreed by the transmitter in advance from the m paths of signals.

The synchronization timing of the first path of signal is separated from the time position of the synchronization signal by a preset time interval, so that the receiver can calculate the synchronization timing of the first path of signal according to the time position of the synchronization signal and the preset time interval, and the synchronization timing of the first path of signal is used for the receiver to analyze effective data included in the first path of signal from the first path of signal.

Step 403: the receiver obtains the time deviation between the effective data initial positions of the first path of signals and the second path of signals, wherein the second path of signals is the other path of signals except the first path of signals in the m paths of signals.

Optionally, if the first path of signal includes time information, the receiver may extract the time information from the first path of signal, and optionally, the receiver may extract the time information from a common control channel in the first path of signal, and then obtain a time offset between start positions of valid data between the first path of signal and the second path of signal according to the time information.

Optionally, if the receiver presets a time offset between the start positions of valid data between the first path of signal and the second path of signal, the receiver directly obtains the preset time offset.

Step 404: and the receiver acquires the synchronous timing of the second path of signal according to the time deviation and the synchronous timing of the first path of signal.

The method comprises the following steps: the synchronous timing of the second path of signal is used for the receiver to analyze the effective data included in the second path of signal from the second path of signal.

Step 405: and the receiver demodulates the second signal according to the synchronous timing of the second signal to obtain effective data in the second signal.

Specifically, the receiver analyzes an OFDM symbol sequence in the second path of signal from the second path of signal according to the synchronization timing of the second path of signal, removes a CP in the OFDM symbol sequence, performs a fourier transform operation on the OFDM symbol sequence without the CP to obtain a subcarrier corresponding to a frequency resource occupied by the second path of signal, and extracts effective data on a predetermined subcarrier position from the subcarrier.

Further, the receiver may also demodulate the first path of signal according to the synchronization timing of the first path of signal, which may specifically be:

the receiver analyzes an OFDM symbol sequence in the first path of signal from the first path of signal according to the synchronous timing of the first path of signal, removes a CP in the OFDM symbol sequence, performs Fourier transform operation on the OFDM symbol sequence without the CP to obtain a subcarrier corresponding to a frequency resource occupied by the first path of signal, and extracts effective data on a preset subcarrier position from the subcarrier.

In the embodiment of the invention, the time deviation between the effective data starting positions of the first path of signal and the second path of signal is obtained, the synchronous timing of the second path of signal is obtained according to the time deviation and the synchronous timing of the first path of signal, and the time deviation is introduced into the synchronous timing of the second path of signal, so that the precision of obtaining the synchronous timing of the second path of signal is improved.

Referring to fig. 5, an embodiment of the present invention provides an apparatus 500 for transmitting a signal, where the apparatus 500 includes: a processing unit 501 and a transmitting unit 502;

the processing unit 501 is configured to modulate each channel of data to be sent in m channels of data to be sent, to obtain m channels of signals to be sent, where m is an integer greater than 1; each path of signals to be sent in the m paths of signals to be sent occupies a section of continuous time resource and frequency resource; the time resources occupied by each path of signals to be transmitted are overlapped and not completely the same; each path of signals to be transmitted occupies continuous frequency resources and is not overlapped;

the processing unit 501 is further configured to perform signal superposition on the m channels of signals to be transmitted to form a channel of superposed signals, where at least one channel of signals to be transmitted has a starting position in the superposed signals later than a starting position of the superposed signals and/or at least one channel of signals to be transmitted has an ending position in the superposed signals earlier than an ending position of the superposed signals;

the sending unit 502 is configured to send the superimposed signal.

Optionally, the processing unit 502 is configured to filter each of the m channels of signals to be transmitted, where each of the filtered signals to be transmitted includes a filtered tail signal; according to the frequency resources occupied by each filtered signal to be sent, completely or partially truncating the filtered tail signals included before and after each filtered signal to be sent, wherein the time resources occupied by each truncated signal to be sent are the same; and superposing the cut signals to be transmitted together to form a superposed signal.

Optionally, the processing unit 502 is configured to perform complete truncation on a filtered tail signal included in the filtered nth signal to be sent if a bandwidth of a frequency resource occupied by the filtered nth signal to be sent is greater than or equal to a preset threshold, where n is 1 and 2 … … m; and if the bandwidth of the frequency resource occupied by the filtered nth signal to be sent is smaller than a preset threshold value, performing partial truncation on a filtered tail signal included in the filtered nth signal to be sent.

Optionally, time resources between the start position of the superimposed signal and the start position of the n-th partially truncated signal to be transmitted and time resources between the end position of the superimposed signal and the end position of the n-th partially truncated signal to be transmitted are used to accommodate a residual filtering tail signal generated after partial truncation.

In the embodiment of the invention, the filtering tail signal included before and after each path of filtered signals to be transmitted is completely or partially truncated, the filtering tail signal can be removed by complete truncation, and the length of the filtering tail signal can be reduced by partial truncation, so that the expense of the filtering tail signal on time resources is reduced.

Referring to fig. 6, an embodiment of the present invention provides an apparatus 600 for receiving a signal, where the apparatus 600 includes: a receiving unit 601 and a processing unit 602;

the receiving unit 601 is configured to receive a superimposed signal, where the superimposed signal includes m channels of signals, m is an integer greater than 1, and a start position of at least one channel of signal in the superimposed signal is later than a start position of the superimposed signal and/or an end position of at least one channel of signal in the superimposed signal is earlier than an end position of the superimposed signal;

the processing unit 602 is configured to extract valid data from the superimposed signal.

Optionally, the processing unit 602 is configured to obtain a synchronization timing of a first path of signal, where the first path of signal is a path of signal that includes a synchronization signal in the m paths of signals; acquiring the synchronous timing of a second path of signals according to the synchronous timing of the first path of signals and the time deviation between the effective data starting positions of the first path of signals and the second path of signals, wherein the second path of signals is other paths of signals except the first path of signals in the m paths of signals; and acquiring effective data in the second path of signals according to the synchronous timing of the second path of signals.

Optionally, the first path of signal includes a synchronization signal;

the processing unit 602 is configured to detect a time position of a synchronization signal included in the first channel of signal, and determine synchronization timing of the first channel of signal according to the time position.

Optionally, the processing unit 602 is further configured to extract time information from the first path of signal, and obtain a time offset between start positions of valid data of the first path of signal and the second path of signal according to the time information, or obtain a preset time offset between start positions of valid data of the first path of signal and the second path of signal.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A method of transmitting a signal, the method comprising:

transmitting the superimposed signal;

wherein, the signal superposition of the m channels of signals to be transmitted to form a channel of superposed signals includes:

and superposing the cut signals to be transmitted together to form a superposed signal, wherein time resources between the starting position of the superposed signal and the starting position of the n-th-path signal to be transmitted subjected to partial truncation or time resources between the ending position of the superposed signal and the ending position of the n-th-path signal to be transmitted subjected to partial truncation are used for accommodating residual filtering trailing signals generated after partial truncation, and n is 1 and 2 … … m.

2. The method of claim 1, wherein the completely or partially truncating the filtered tail signals included before and after the filtered signal to be transmitted according to the frequency resources occupied by the filtered signal to be transmitted respectively comprises:

if the bandwidth of the frequency resource occupied by the filtered nth signal to be sent is greater than or equal to a preset threshold value, completely cutting off a filtered tail signal included in the filtered nth signal to be sent;

3. The method of claim 1 or 2, wherein the length of the time resource occupied by each signal to be transmitted is less than or equal to the length of the superimposed signal.

4. The method of claim 1,

at least one path of signals to be transmitted in the m paths of signals to be transmitted comprises synchronous signals.

5. The method of claim 4,

6. The method of claim 1,

7. A method of receiving a signal, the method comprising:

receiving a superimposed signal, wherein the superimposed signal includes m channels of signals, m is an integer greater than 1, a starting position of at least one channel of signal in the superimposed signal is later than a starting position of the superimposed signal and/or an ending position of at least one channel of signal in the superimposed signal is earlier than an ending position of the superimposed signal, wherein if a bandwidth of a frequency resource occupied by an nth channel of signal is greater than or equal to a preset threshold, the nth channel of signal does not include a filtering tail signal, and n is 1, 2 … … m; if the bandwidth of the frequency resources occupied by the nth signal is less than a preset threshold, the nth signal comprises a partial filtering tail signal, and the time resources between the starting position of the superposed signal and the starting position of the nth signal to be sent comprising the partial filtering tail signal or the time resources between the ending position of the superposed signal and the ending position of the nth signal to be sent comprising the partial filtering tail signal are used for accommodating a residual filtering tail signal generated after partial truncation;

and extracting effective data from the superposed signals.

8. The method of claim 7, wherein the length of the time resource occupied by each signal is less than or equal to the length of the superimposed signal.

9. The method of claim 7, wherein said extracting valid data from said superimposed signal comprises:

10. The method of claim 9,

the first path of signal comprises a synchronous signal;

11. The method of claim 9, wherein before the obtaining the synchronization timing of the second path of signal, further comprising:

12. An apparatus for transmitting a signal, the apparatus comprising: a processing unit and a transmitting unit;

the transmitting unit is used for transmitting the superposed signal;

the processing unit is configured to filter each of the m channels of signals to be transmitted, where the front and the back of each channel of signals to be transmitted after filtering include a filtered tail signal; according to the frequency resources occupied by each filtered signal to be sent, completely or partially truncating the filtered tail signals included before and after each filtered signal to be sent, wherein the time resources occupied by each truncated signal to be sent are the same; and superposing the cut signals to be transmitted together to form a superposed signal, wherein time resources between the starting position of the superposed signal and the starting position of the n-th-path signal to be transmitted subjected to partial truncation or time resources between the ending position of the superposed signal and the ending position of the n-th-path signal to be transmitted subjected to partial truncation are used for accommodating residual filtering trailing signals generated after partial truncation, and n is 1 and 2 … … m.

13. The apparatus of claim 12,

14. The apparatus according to claim 12 or 13, wherein the length of the time resource occupied by each signal to be transmitted is smaller than or equal to the length of the superimposed signal.

15. The apparatus of claim 12,

16. The apparatus of claim 15,

17. The apparatus of claim 12,

18. An apparatus for receiving a signal, the apparatus comprising: a receiving unit and a processing unit;

the receiving unit is configured to receive a superimposed signal, where the superimposed signal includes m channels of signals, m is an integer greater than 1, a starting position of at least one channel of signal in the superimposed signal is later than a starting position of the superimposed signal and/or an ending position of at least one channel of signal in the superimposed signal is earlier than an ending position of the superimposed signal, if a bandwidth of a frequency resource occupied by an nth channel of signal is greater than or equal to a preset threshold, the nth channel of signal does not include a filtering tail signal, and n is 1, 2 … … m; if the bandwidth of the frequency resources occupied by the nth signal is less than a preset threshold, the nth signal comprises a partial filtering tail signal, and the time resources between the starting position of the superposed signal and the starting position of the nth signal to be sent comprising the partial filtering tail signal or the time resources between the ending position of the superposed signal and the ending position of the nth signal to be sent comprising the partial filtering tail signal are used for accommodating a residual filtering tail signal generated after partial truncation;

19. The apparatus of claim 18, wherein the length of the time resource occupied by each signal is less than or equal to the length of the superimposed signal.

20. The apparatus of claim 18,

21. The apparatus as recited in claim 20,

the first path of signal comprises a synchronous signal;

22. The apparatus of claim 20,