WO2018161875A1

WO2018161875A1 - Data modulation method and device for edge sub-band, and computer storage medium

Info

Publication number: WO2018161875A1
Application number: PCT/CN2018/078049
Authority: WO
Inventors: 边峦剑; 辛雨
Original assignee: 中兴通讯股份有限公司
Priority date: 2017-03-06
Filing date: 2018-03-05
Publication date: 2018-09-13
Also published as: CN108540418B; CN108540418A

Abstract

Disclosed are a data modulation method and device for an edge sub-band, and a computer storage medium. The method comprises: selecting a sub-carrier on an edge sub-band of a transmission frequency band, wherein the position of the sub-carrier characterises modulation information; and according to the selected sub-carrier position, modulating data.

Description

Data modulation method and device for edge subband, computer storage medium

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application No. PCT Application No. PCT Application Serial No.

Technical field

The present application relates to the field of multi-carrier technologies, and in particular, to a data modulation method and apparatus for an edge sub-band of a multi-carrier system, and a computer storage medium.

Background technique

Long Term Evolution (LTE) is a long-term evolution of the Universal Mobile Telecommunications System (UMTS) technology standard developed by the 3rd Generation Partnership Project (3GPP). The LTE system introduces Orthogonal Frequency Division Multiplexing (OFDM) technology, and the time-frequency resources composed of subcarriers and OFDM symbols form the wireless physical time-frequency resources of the LTE system. However, the out-of-band leakage of the LTE system is relatively large, so the two ends of the transmission band often have a frequency to be used as a guard interval to reduce the influence of the out-of-band leakage on the adjacent frequency band. In this way, the transmission band is wasted to a certain extent, and the spectrum utilization efficiency is reduced.

Summary of the invention

In order to solve the above technical problem, an embodiment of the present application provides a data modulation method and apparatus for an edge subband, and a computer storage medium, which enable a multicarrier system to effectively utilize edge subbands of a transmission band and control the influence of out-of-band leakage.

The data modulation method for the edge subband provided by the embodiment of the present application includes:

Selecting a subcarrier on an edge subband of the transmission band, wherein the location of the subcarrier characterizes modulation information;

The data is modulated according to the location of the selected subcarrier.

The data modulation device for the edge subband provided by the embodiment of the present application includes:

a selecting unit configured to select a subcarrier on an edge subband of the transmission band, wherein a location of the subcarrier characterizes modulation information;

A modulation unit configured to modulate data according to a location of the selected subcarrier.

The embodiment of the present application further provides a computer storage medium storing a computer program configured to perform the data modulation method of the edge sub-band.

In the technical solution of the embodiment of the present application, a subcarrier is selected on an edge subband of a transmission frequency band, where a location of the subcarrier represents modulation information; and data is modulated according to a location of the selected subcarrier. In this way, the amount of modulation information can be increased while reducing the subcarrier load, the transmission power can be reduced, and the influence of out-of-band leakage can be controlled, so that the multi-carrier system can reduce or omit the band guard interval and effectively utilize the edge sub-band of the transmission band.

DRAWINGS

The drawings generally illustrate the various embodiments discussed herein by way of example and not limitation.

1 is a schematic flowchart 1 of a data modulation method for an edge subband according to an embodiment of the present application;

2 is a second schematic flowchart of a data modulation method for an edge subband according to an embodiment of the present application;

3 is a schematic flowchart 3 of a data modulation method for an edge subband according to an embodiment of the present application;

4 is a schematic flowchart of a data modulation method for an edge subband of a 5 MHz bandwidth multi-carrier system according to an embodiment of the present application;

5 is a schematic flowchart of a data modulation method for an edge subband of another 5 MHz bandwidth multi-carrier system according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a data modulation apparatus for an edge subband according to an embodiment of the present application.

detailed description

The embodiments of the present application are described in detail with reference to the accompanying drawings.

The out-of-band leakage of the LTE system is relatively large. Therefore, the two ends of the transmission band often have a frequency to be used as a guard interval to reduce the influence of the out-of-band leakage on the adjacent frequency band. In this way, the transmission band is wasted to a certain extent, and the spectrum utilization efficiency is reduced. To this end, the embodiment of the present application proposes a data modulation method and apparatus for an edge subband of a multi-carrier system, so that the multi-carrier system can effectively utilize edge subbands of the transmission band and control the influence of out-of-band leakage.

The following is an explanation of the key terms related to the embodiments of the present application:

Multi-carrier system: A system that uses multiple sub-carriers to transmit data, such as an OFDM system.

Transmitting Node: In the embodiment of the present application, the following transmitting devices are collectively referred to as a transmitting node: a base station, a terminal, a relay, a transmitting point, and the like.

1 is a schematic flowchart 1 of a data modulation method for an edge subband according to an embodiment of the present application. As shown in FIG. 1, the data modulation method of the edge subband includes the following steps:

Step 101: Select a subcarrier on an edge subband of a transmission band, wherein a location of the subcarrier characterizes modulation information.

Here, the location of the subcarrier represents modulation information, including:

The position of a single subcarrier characterizes one modulation information, or the combination of locations of multiple subcarriers characterizes one modulation information.

In the embodiment of the present application, the selecting a subcarrier on an edge subband of a transmission band includes:

The subcarriers are selected within 2 ^N+1 subcarriers of the edge subband of the transmission band, the N taking a natural number, or the N taking a positive odd number.

Step 102: Modulate data according to the location of the selected subcarrier.

Example embodiments of the present application, the selected subcarriers within 2 ^{N + 1} subcarriers in the transmission band of the edge sub-band for the 2 ^{N + 1} sub-carriers, determine the corresponding relationship between the position of the subcarrier data; based on the sub- Corresponding relationship between the location of the carrier and the data, and selecting corresponding subcarriers for the data to be transmitted.

In the above solution, subcarriers are selected for the data to be transmitted in the ^2N+1 subcarriers on one time domain symbol. The number of subcarriers selected on different time domain symbols is the same or different, and the subcarrier positions selected on different time domain symbols are the same or different.

In another embodiment of the present application, the edge subband is divided into multiple time-frequency resource blocks; for each time-frequency resource block, the correspondence between the location of the sub-carriers in the time-frequency resource block and the data is determined; Corresponding relationship between the location of the subcarrier and the data, selecting a corresponding subcarrier for the data to be transmitted; mapping the data to be transmitted to the selected subcarrier.

In the foregoing solution, the dividing the edge subband into multiple time-frequency resource blocks includes:

The edge sub-band is divided into p time-frequency resource blocks, and p is an integer greater than or equal to 1, wherein different time-frequency resource blocks include the same or different number of sub-carriers.

In the above solution, the data amounts of the data to be transmitted loaded by different time-frequency resource blocks are the same or different.

In the above solution, the selecting a corresponding subcarrier for the data to be transmitted includes:

Selecting subcarriers on time domain symbols of the time-frequency resource block for data to be transmitted, wherein the number of subcarriers selected on different time domain symbols is the same or different, and the selected subcarrier positions on different time domain symbols are the same Or different.

2 is a schematic flowchart 2 of a data modulation method for an edge subband according to an embodiment of the present application. The data modulation method in this example is applied to a transmitting node. As shown in FIG. 2, the data modulation method of the edge subband includes the following steps. :

Step 201: Determine a correspondence between the subcarrier position and the data for 2 ^N+1 subcarriers of the edge subband.

Here, the edge sub-band is at an edge position of the transmission band in the frequency domain. The edge subband may be an edge subband at one end of the transmission band or an edge subband at both ends of the transmission band.

2 ^N+1 subcarriers of the edge subband, where N takes a natural number, or N takes a positive odd number. When the single subcarrier position corresponds to the bit information, 2 ^N+1 subcarriers may modulate N+1 bit information. Therefore, when N takes a natural number, 2 ^N+1 subcarriers can modulate an integer number of bit information; when N takes a positive odd number, 2 ^N+1 subcarriers can modulate an even number of bit information, which is advantageous for matching existing channel coding techniques. .

In this embodiment, the determining the correspondence between the subcarrier position and the data includes: the location of the single subcarrier characterizes one modulation information, that is, the single subcarrier corresponding to k data; or the location combination of the multiple subcarriers represents a modulation information. That is, a combination of multiple subcarriers corresponds to k data; where k>0.

In this embodiment, the data may be digital bit information with a value of 0 or 1, or may be binary phase shift keying (BPSK, Binary Phase Shift Keying) or quadrature phase shift keying (QPSK, Quadrature Phase Shift Keyin). Digital modulation information such as Quadrature Amplitude Modulation (QAM) can also be other data forms, which are collectively referred to herein as data.

Step 202: Select a corresponding subcarrier for the data to be transmitted according to the correspondence between the location of the subcarrier and the data.

In this embodiment, the subcarriers are selected for the data to be transmitted in the ^2N+1 subcarriers on one time domain symbol.

Step 203: Map the data to be transmitted onto the selected subcarrier.

In this embodiment, the selected subcarrier load data is on the edge subband; the unselected subcarriers on the edge subband do not load data.

3 is a schematic flowchart 3 of a data modulation method for an edge subband according to an embodiment of the present application. The data modulation method in this example is applied to a transmitting node. As shown in FIG. 3, the data modulation method of the edge subband includes the following steps. :

Step 301: Divide the edge subband into multiple time-frequency resource blocks.

Here, the edge sub-band is at an edge position of the transmission band in the frequency domain. The edge subband may be an edge subband at one end of the transmission band or an edge subband at both ends of the transmission band. The edge subband includes k subcarriers, and k is an integer greater than or equal to 1.

The edge sub-band is divided into p time-frequency resource blocks, and p is an integer greater than or equal to 1; wherein different time-frequency resource blocks include the same or different number of sub-carriers.

Step 302: Determine, for each time-frequency resource block, a correspondence between the location of the sub-carriers in the time-frequency resource block and the data.

Here, for each time-frequency resource block, a corresponding relationship between the sub-carrier position and the data in the time-frequency resource block is respectively determined; wherein, the position of the single sub-carrier represents a modulation information, that is, a single sub-carrier corresponding to k data, Or the location combination of multiple subcarriers characterizes one modulation information, that is, the combination of multiple subcarriers corresponds to k data, where k>0. The combination of the plurality of subcarriers characterization that one modulation information may be a combination of 2 subcarriers characterizing one modulation information, or a combination of 3 subcarriers characterizing one modulation information, or a combination of 4 subcarriers characterizing a modulation information, etc. This type of push.

In this embodiment, the correspondence between the subcarrier position and the data is not limited to be determined in a single time-frequency resource block, and the multiple time-frequency resource blocks may be combined to determine the subcarrier position in the joint time-frequency resource block. The correspondence of the data.

Step 303: Select a corresponding subcarrier for the data to be transmitted according to the corresponding relationship between the subcarrier position and the data.

In this embodiment, based on the correspondence between the subcarrier position and the data described in step 202, the subcarriers are selected on the time domain symbols for the data to be transmitted.

Further, subcarriers are selected in the frequency domain of the time domain symbols. The number of subcarriers selected on different time domain symbols is the same or different; the subcarrier positions selected on different time domain symbols are the same or different.

Step 304: Map the data to be transmitted onto the selected subcarrier.

In this embodiment, the selected subcarriers on the edge subband load data to be transmitted; the unselected subcarriers on the edge subband do not load data.

In the embodiment of the present application, the data amounts of the data to be transmitted loaded by different time-frequency resource blocks are the same or different.

In the embodiment of the present application, the time domain OFDM symbol of the load reference signal includes, but is not limited to, the following two processing methods: 1. The edge subband of the OFDM symbol of the load reference signal no longer loads data; 2. The OFDM of the load reference signal The edge subband of the symbol carries the data, and the data is modulated according to steps 201-204 by using the subcarrier position other than the reference signal.

4 is a schematic flowchart of a data modulation method for an edge sub-band of a 5 MHz bandwidth multi-carrier system according to an embodiment of the present disclosure. In this embodiment, a transmission frequency band of 5 MHz bandwidth occupies a total of 300 sub-carrier frequency domain resources. The data is transmitted, and the edge subbands of 16 subcarriers are respectively left at both ends of the transmission band, wherein the subcarrier spacing is 15 kHz. As shown in FIG. 4, the data modulation method of the edge subband includes the following steps:

Step 401: Determine a correspondence between the subcarrier position and the data for the 16 subcarriers of the edge subband.

In this embodiment, the location of a single subcarrier characterizes one modulation information. Since the edge subband contains 16 subcarriers with 16 different single subcarrier positions, the single subcarrier position corresponds to 4 bits of information. Table 1 gives an example of the correspondence between a single subcarrier position and bit information.

Table 1 (subcarrier position corresponding bit data)

Step 402: Select a corresponding subcarrier for the data to be transmitted according to the correspondence between the location of the subcarrier and the data.

In this embodiment, taking the third OFDM symbol as an example, if 16 subcarriers of one edge subband need to transmit 4 bit information and 1 QPSK information, respectively, 0, 0, 1, 1 and

Then select the 4th subcarrier according to Table 1.

Step 403: Map the data to be transmitted onto the selected subcarrier.

In this embodiment, according to the steps of 401 and 402, the QPSK data to be transmitted is to be transmitted.

Transmitted on the 4th subcarrier, the other subcarriers on the edge subband do not transmit data. Therefore, the 4th subcarrier also indicates bit data 0, 0, 1, 1 while loading the QPSK information.

FIG. 5 is a schematic flowchart of a data modulation method for an edge subband of a 5 MHz bandwidth multi-carrier system according to an embodiment of the present application. The data modulation method in this example is applied to a transmitting node, as shown in FIG. 5, the edge sub- The data modulation method of the band includes the following steps:

Step 501: Divide an edge subband of a 5 MHz bandwidth multi-carrier system into a plurality of time-frequency resource blocks.

In the embodiment of the present application, the 5 MHz bandwidth LTE system occupies a total of 300 subcarriers of frequency domain resources for transmitting data, and the edge subbands of the remaining 33 subcarriers are vacated at both ends of the transmission band as a guard interval, where the subcarriers The interval is 15 kHz. According to an embodiment of the present application, the edge subband including 33 subcarriers is divided into 4 time-frequency resource blocks, and each time-frequency resource block includes 8 sub-carriers.

Step 502: Determine, for each time-frequency resource block, a correspondence between a sub-carrier position and a data in the time-frequency resource block.

In the embodiment of the present application, for the four time-frequency resource blocks described in step 301, the correspondence between the location of the sub-carriers in each time-frequency resource block and the data is determined. Table 2 shows the correspondence between the location of a single subcarrier and the QPSK data.

Table 2 (Subcarrier position corresponds to QPSK data)

In this embodiment, the data corresponding to the subcarrier position may further include: bit data of 0 or 1, digital modulated data such as BPSK, QAM, and other forms of data.

Step 503: Select a corresponding subcarrier on the OFDM symbol for the data to be transmitted according to the corresponding relationship between the subcarrier position and the data.

In this embodiment, taking the third OFDM symbol of the first time-frequency resource block as an example, if four QPSK data information to be transmitted are loaded, respectively

Then, the subcarriers corresponding to the selected location include, but are not limited to, the following method: selecting the subcarriers by using the second and fourth data. According to the correspondence of Table 2 in step 502, the third and sixth subcarrier load data should be selected.

Step 504: Map the data to be transmitted onto the selected subcarrier.

In this embodiment, according to the methods in

steps

502 and 503, the first and third data are respectively mapped to the subcarriers 3 and 6, and at the same time, the subcarriers 3 and 6 respectively indicate the data.

with

The embodiment is not limited to a multi-carrier system with a bandwidth of 5 MHz, and a multi-carrier system of any numerical bandwidth such as 2.5 MHz, 10 MHz, 20 MHz, or 100 MHz. Similarly, the data modulation method of the edge sub-band described in this embodiment can be used.

FIG. 6 is a schematic structural diagram of a data modulation apparatus for an edge subband according to an embodiment of the present application. As shown in FIG. 6, the apparatus includes:

The selecting unit 41 is configured to select a subcarrier on an edge subband of the transmission band, wherein the location of the subcarrier represents modulation information;

Modulation unit 42 is configured to modulate data based on the location of the selected subcarrier.

In the embodiment of the present application, the location of the subcarrier represents the modulation information, including:

In the embodiment of the present application, the selecting unit 41 is configured to select a subcarrier within 2 ^N+1 subcarriers of an edge subband of a transmission band, where the N takes a natural number, or the N takes a positive odd number.

In the embodiment of the present application, the device further includes:

The dividing unit 43 is configured to divide the edge subband into a plurality of time-frequency resource blocks;

The determining unit 44 is configured to determine a correspondence between the location of the subcarriers in the time-frequency resource block and the data for each time-frequency resource block;

The selecting unit 41 is configured to select a corresponding subcarrier for the data to be transmitted based on the correspondence between the location of the subcarrier and the data;

The modulating unit 42 is configured to map the data to be transmitted onto the selected subcarrier.

In the embodiment of the present application, the dividing unit 43 is configured to divide the edge subband into p time-frequency resource blocks, where p is an integer greater than or equal to 1, wherein different time-frequency resource blocks include the same number of sub-carriers or different numbers. .

In the embodiment of the present application, the selecting unit 41 is configured to select subcarriers on the time domain symbols of the time-frequency resource block for the data to be transmitted, where the number of subcarriers selected on different time domain symbols is the same or Differently, the subcarrier positions selected on different time domain symbols are the same or different.

In a practical application, the selecting unit 41, the dividing unit 43, and the determining unit 44 can all pass through a central processing unit (CPU) or a microprocessor (Micro Processor Unit) in the data modulation device located in the edge subband. MPU), or a digital signal processor (DSP), or a Field Programmable Gate Array (FPGA). The modulation unit 42 can be implemented by a modem.

It will be understood by those skilled in the art that the implementation functions of the units in the data modulation apparatus of the edge sub-band shown in FIG. 6 can be understood by referring to the related description of the data modulation method of the foregoing edge sub-band. The function of each unit in the data modulation apparatus of the edge sub-band shown in FIG. 6 can be realized by a program running on a processor, or can be realized by a specific logic circuit.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Accordingly, the application can take the form of a hardware embodiment, a software embodiment, or an embodiment in combination with software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Correspondingly, the embodiment of the present application further provides a computer storage medium, wherein a computer program configured to perform the data modulation method of the edge sub-band of the embodiment of the present application is stored.

The above is only the preferred embodiment of the present application and is not intended to limit the scope of the present application.

Industrial applicability

In the technical solution of the embodiment of the present application, a subcarrier is selected on an edge subband of a transmission band, where a location of the subcarrier represents modulation information, and data is modulated according to a location of the selected subcarrier. In this way, the amount of modulation information can be increased while reducing the subcarrier load, the transmission power can be reduced, and the influence of out-of-band leakage can be controlled, so that the multi-carrier system can reduce or omit the band guard interval and effectively utilize the edge sub-band of the transmission band.

Claims

A data modulation method for edge subbands, the method comprising:

Selecting a subcarrier on an edge subband of the transmission band, wherein the location of the subcarrier characterizes modulation information;

The data is modulated according to the location of the selected subcarrier.
The method of claim 1 wherein the location of the subcarriers characterizes modulation information, comprising:

The position of a single subcarrier characterizes one modulation information, or the combination of locations of multiple subcarriers characterizes one modulation information.
The method of claim 1 wherein said selecting subcarriers on edge subbands of a transmission band comprises:

The subcarriers are selected within 2 N+1 subcarriers of the edge subband of the transmission band, the N taking a natural number, or the N taking a positive odd number.
The method of claim 1 wherein said selecting a subcarrier on an edge subband of a transmission band and modulating data based on the location of the selected subcarrier comprises:

Dividing the edge subband into a plurality of time-frequency resource blocks;

Determining a correspondence between a location of the subcarriers in the time-frequency resource block and the data for each time-frequency resource block;

Selecting a corresponding subcarrier for the data to be transmitted based on the correspondence between the location of the subcarrier and the data;

Mapping the data to be transmitted onto the selected subcarrier.
The method according to claim 4, wherein the dividing the edge subband into a plurality of time-frequency resource blocks comprises:

The edge sub-band is divided into p time-frequency resource blocks, and p is an integer greater than or equal to 1, wherein different time-frequency resource blocks include the same or different number of sub-carriers.
The method according to claim 4 or 5, wherein the data amounts of the data to be transmitted loaded by the different time-frequency resource blocks are the same or different.
The method of claim 4, wherein the selecting a corresponding subcarrier for the data to be transmitted comprises:

Selecting subcarriers on time domain symbols of the time-frequency resource block for data to be transmitted, wherein the number of subcarriers selected on different time domain symbols is the same or different, and the selected subcarrier positions on different time domain symbols are the same Or different.
A data modulation device for edge subbands, the device comprising:

a selecting unit configured to select a subcarrier on an edge subband of the transmission band, wherein a location of the subcarrier characterizes modulation information;

A modulation unit configured to modulate data according to a location of the selected subcarrier.
The apparatus of claim 8, wherein the location of the subcarriers characterizes modulation information, comprising:

The position of a single subcarrier characterizes one modulation information, or the combination of locations of multiple subcarriers characterizes one modulation information.
The apparatus according to claim 8, wherein said selecting unit, configured to select sub-carriers within a 2 N + 1 subcarriers in the transmission band of the edge sub-band, the N is a natural number, N is a positive odd number or .
The apparatus of claim 8 wherein said apparatus further comprises:

a dividing unit configured to divide the edge subband into a plurality of time-frequency resource blocks;

a determining unit, configured to determine a correspondence between a location of the subcarriers in the time-frequency resource block and the data for each time-frequency resource block;

The selecting unit is configured to select a corresponding subcarrier for the data to be transmitted based on the correspondence between the location of the subcarrier and the data;

The modulating unit is configured to map the data to be transmitted onto the selected subcarrier.
The apparatus according to claim 11, wherein the dividing unit is configured to divide an edge subband into p time-frequency resource blocks, where p is an integer greater than or equal to 1, wherein subcarriers included in different time-frequency resource blocks The numbers are the same or different.
The apparatus according to claim 11 or 12, wherein the data amounts of the data to be transmitted loaded by the different time-frequency resource blocks are the same or different.
The apparatus according to claim 11, wherein the selecting unit is configured to select subcarriers on time domain symbols of the time-frequency resource block for data to be transmitted, wherein the sub-carriers selected on different time domain symbols The number of carriers is the same or different, and the subcarrier positions selected on different time domain symbols are the same or different.
A computer storage medium having stored therein computer executable instructions configured to perform the edge subband data modulation method of any of claims 1-7.