CN108540418B - Data modulation method and device for edge sub-band - Google Patents
Data modulation method and device for edge sub-band Download PDFInfo
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- CN108540418B CN108540418B CN201710127897.8A CN201710127897A CN108540418B CN 108540418 B CN108540418 B CN 108540418B CN 201710127897 A CN201710127897 A CN 201710127897A CN 108540418 B CN108540418 B CN 108540418B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
Abstract
The invention discloses a data modulation method and a device of an edge sub-band, wherein the method comprises the following steps: selecting subcarriers on edge subbands at two ends of a transmission band, wherein the positions of the subcarriers represent modulation information; the data is modulated according to the position of the selected sub-carriers.
Description
Technical Field
The present invention relates to the field of multicarrier technology, and in particular, to a method and an apparatus for modulating data of an edge subband in a multicarrier system.
Background
Long Term Evolution (LTE) is a Long Term Evolution of The Universal Mobile Telecommunications System (UMTS) technology standard established by The 3rd Generation Partnership Project (3 GPP) organization. The LTE system introduces an Orthogonal Frequency Division Multiplexing (OFDM) technology, and the time-Frequency resources formed by subcarriers and OFDM symbols constitute the wireless physical time-Frequency resources of the LTE system. However, the out-of-band leakage of the LTE system is relatively large, and therefore, a frequency is often left at two ends of a transmission band as a guard interval to reduce the influence of the out-of-band leakage on adjacent bands. Thus, the waste of the transmission frequency band is avoided to a certain extent, and the spectrum utilization efficiency is reduced.
Disclosure of Invention
To solve the foregoing technical problem, embodiments of the present invention provide a method and an apparatus for data modulation of an edge subband, so that a multi-carrier system can effectively utilize edge subbands at two ends of a transmission band and control the influence of out-of-band leakage.
The data modulation method of the edge sub-band provided by the embodiment of the invention comprises the following steps:
selecting subcarriers on edge subbands at two ends of a transmission band, wherein the positions of the subcarriers represent modulation information;
the data is modulated according to the position of the selected sub-carriers.
In this embodiment of the present invention, the position of the subcarrier represents modulation information, which includes:
the position of a single subcarrier characterizes one modulation information, or the position combination of a plurality of subcarriers characterizes one modulation information.
In this embodiment of the present invention, the selecting subcarriers on edge subbands at two ends of a transmission band, and modulating data according to positions of the selected subcarriers, includes:
dividing the edge sub-band into a plurality of time-frequency resource blocks;
determining the corresponding relation between the position of a subcarrier in each time-frequency resource block and data aiming at each time-frequency resource block;
selecting corresponding subcarriers for the data to be transmitted based on the corresponding relation between the positions of the subcarriers and the data;
and mapping the data to be transmitted to the selected subcarriers.
In the embodiment of the present invention, the dividing the edge sub-band into a plurality of time-frequency resource blocks includes:
and dividing the edge sub-band into p time-frequency resource blocks, wherein p is an integer greater than or equal to 1, and the number of subcarriers included in different time-frequency resource blocks is the same or different.
In the embodiment of the invention, the data volume of the data to be transmitted of different time-frequency resource block loads is the same or different.
In the embodiment of the present invention, the selecting the corresponding subcarrier for the data to be transmitted includes:
and selecting subcarriers on time domain symbols of the time frequency resource block for the data to be transmitted, wherein the number of the subcarriers selected on different time domain symbols is the same or different, and the positions of the subcarriers selected on different time domain symbols are the same or different.
The data modulation device of the edge sub-band provided by the embodiment of the invention comprises:
a selecting unit, configured to select a subcarrier on edge subbands at two ends of a transmission band, where a position of the subcarrier represents modulation information;
and the modulation unit is used for modulating the data according to the position of the selected subcarrier.
In this embodiment of the present invention, the position of the subcarrier represents modulation information, which includes:
the position of a single subcarrier characterizes one modulation information, or the position combination of a plurality of subcarriers characterizes one modulation information.
In the embodiment of the present invention, the apparatus further includes:
the dividing unit is used for dividing the edge sub-band into a plurality of time-frequency resource blocks;
a determining unit, configured to determine, for each time-frequency resource block, a corresponding relationship between a position of a subcarrier in the time-frequency resource block and data;
the selection unit is specifically configured to select a corresponding subcarrier for the data to be transmitted based on a correspondence between the positions of the subcarriers and the data;
the modulation unit is specifically configured to map the data to be transmitted to the selected subcarrier.
In the embodiment of the present invention, the dividing unit is specifically configured to divide the edge subband into p time-frequency resource blocks, where p is an integer greater than or equal to 1, and the number of subcarriers included in different time-frequency resource blocks is the same or different.
In the embodiment of the invention, the data volume of the data to be transmitted of different time-frequency resource block loads is the same or different.
In the embodiment of the present invention, the selecting unit is specifically configured to select subcarriers for data to be transmitted on time domain symbols of the time-frequency resource block, where the number of subcarriers selected on different time domain symbols is the same or different, and the positions of subcarriers selected on different time domain symbols are the same or different.
In the technical scheme of the embodiment of the invention, subcarriers are selected on edge subbands at two ends of a transmission band, wherein the positions of the subcarriers represent modulation information; the data is modulated according to the position of the selected sub-carriers. Thus, the amount of modulation information is increased while the load of subcarriers is reduced, transmission power is reduced, and the influence of out-of-band leakage is controlled, so that the guard interval of the band is reduced or omitted in the multicarrier system, and the edge subbands at both ends of the transmission band can be effectively used.
Drawings
The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
Fig. 1 is a first flowchart illustrating a data modulation method for edge subbands according to an embodiment of the present invention;
FIG. 2 is a second flowchart illustrating a data modulation method for edge subbands according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a data modulation method for an edge subband of a 5MHz bandwidth multicarrier system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a data modulation apparatus for edge subbands according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
The out-of-band leakage of the LTE system is relatively large, so a section of frequency is often left at two ends of a transmission band as a guard interval to reduce the influence of the out-of-band leakage on adjacent bands. Thus, the waste of the transmission frequency band is avoided to a certain extent, and the spectrum utilization efficiency is reduced. Therefore, the embodiment of the invention provides a data modulation method and a data modulation device for an edge subband of a multi-carrier system, so that the multi-carrier system can effectively utilize the edge subbands at two ends of a transmission frequency band and control the influence of out-of-band leakage.
The following is an explanation of key terms associated with embodiments of the present invention:
a multi-carrier system: refers to a system, such as an OFDM system, that uses multiple subcarriers to transmit data.
A transmitting node: the following transmitting devices are collectively referred to as transmitting nodes in the embodiment of the invention: a base station, a terminal, a relay (relay), a transmission point (transmitting point), and the like.
Fig. 1 is a first flowchart of a data modulation method for an edge subband according to an embodiment of the present invention, as shown in fig. 1, the data modulation method for an edge subband includes the following steps:
step 101: and selecting subcarriers on edge subbands at two ends of a transmission band, wherein the positions of the subcarriers represent modulation information.
Here, the position of the subcarrier represents modulation information, including:
the position of a single subcarrier characterizes one modulation information, or the position combination of a plurality of subcarriers characterizes one modulation information.
Step 102: the data is modulated according to the position of the selected sub-carriers.
In the embodiment of the invention, the edge sub-band is divided into a plurality of time-frequency resource blocks; determining the corresponding relation between the position of a subcarrier in each time-frequency resource block and data aiming at each time-frequency resource block; selecting corresponding subcarriers for the data to be transmitted based on the corresponding relation between the positions of the subcarriers and the data; and mapping the data to be transmitted to the selected subcarriers.
In the foregoing scheme, the dividing the edge sub-band into multiple time-frequency resource blocks includes:
and dividing the edge sub-band into p time-frequency resource blocks, wherein p is an integer greater than or equal to 1, and the number of subcarriers included in different time-frequency resource blocks is the same or different.
In the above scheme, the data amount of the data to be transmitted loaded by different time-frequency resource blocks is the same or different.
In the foregoing solution, selecting corresponding subcarriers for data to be transmitted includes:
and selecting subcarriers on time domain symbols of the time frequency resource block for the data to be transmitted, wherein the number of the subcarriers selected on different time domain symbols is the same or different, and the positions of the subcarriers selected on different time domain symbols are the same or different.
Fig. 2 is a second flowchart illustrating a data modulation method for an edge subband according to an embodiment of the present invention, where the data modulation method in this example is applied to a transmitting node, and as shown in fig. 2, the data modulation method for the edge subband includes the following steps:
step 201: the edge sub-band is divided into a plurality of time-frequency resource blocks.
Here, the edge sub-band is a sub-band at the most end position of the transmission band in the frequency domain. The edge sub-band comprises k sub-carriers, wherein k is an integer greater than or equal to 1.
Dividing the edge sub-band into p time-frequency resource blocks, wherein p is an integer greater than or equal to 1; and the number of the sub-carriers contained in different time-frequency resource blocks is the same or different.
Step 202: and aiming at each time-frequency resource block, determining the corresponding relation between the subcarrier position in the time-frequency resource block and data.
In this embodiment, the data may be digital bit information having a value of 0 or 1, or may be digital Modulation information such as Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), or other data format, which is collectively referred to as data herein.
Here, for each time-frequency resource block, respectively determining a corresponding relationship between a subcarrier position and data in the time-frequency resource block; the position of a single subcarrier represents a piece of modulation information, i.e. a single subcarrier corresponds to a piece of data, or the position combination of a plurality of subcarriers represents a piece of modulation information, i.e. the combination of a plurality of subcarriers corresponds to a piece of data. The combination of the multiple sub-carriers represents a modulation information, and the combination of 2 sub-carriers represents a modulation information, or the combination of 3 sub-carriers represents a modulation information, or the combination of 4 sub-carriers represents a modulation information, and so on.
In this embodiment, the corresponding relationship between the subcarrier position and the data is not limited to be determined in a single time-frequency resource block, and the corresponding relationship between the subcarrier position and the data may also be determined in a manner of combining a plurality of time-frequency resource blocks.
Step 203: and selecting corresponding subcarriers for the data to be transmitted according to the corresponding relation between the subcarrier positions and the data.
In this embodiment, based on the correspondence between the positions of the subcarriers and the data described in step 202, subcarriers are selected for the data to be transmitted on the time domain symbol.
Further, subcarriers are selected in the frequency domain of the time domain symbols. The number of the subcarriers selected on different time domain symbols is the same or different; the subcarrier locations selected on different time domain symbols are the same or different.
Step 204: and mapping the data to be transmitted to the selected subcarriers.
In this embodiment, the selected sub-carriers on the edge sub-band carry data to be transmitted; the non-selected sub-carriers on the edge sub-band are not loaded with data.
In the embodiment of the invention, the data volume of the data to be transmitted of different time-frequency resource block loads is the same or different.
In the embodiment of the present invention, for a time domain OFDM symbol carrying a reference signal, the following two processing methods are included, but not limited to: firstly, no data is loaded on an edge sub-band of an OFDM symbol loaded with a reference signal; secondly, carrying data by the edge sub-band of the OFDM symbol carrying the reference signal, and carrying out data modulation according to the steps 201 to 204 by using the positions of the sub-carriers except the reference signal.
Fig. 3 is a schematic flow chart of a data modulation method for an edge subband in a 5MHz bandwidth multicarrier system according to an embodiment of the present invention, where the data modulation method in this example is applied to a transmitting node, and as shown in fig. 3, the data modulation method for the edge subband includes the following steps:
step 301: and dividing the edge sub-band of the 5MHz bandwidth multi-carrier system into a plurality of time-frequency resource blocks.
In the embodiment of the invention, the LTE system with 5MHz bandwidth occupies 300 frequency domain resources in total for data transmission, and the remaining 33 edge sub-bands of the sub-carriers are left at the two ends of the transmission frequency band as guard intervals, wherein the sub-carrier interval is 15 kHz. According to the embodiment of the invention, the edge sub-band containing 33 sub-carriers is divided into 4 time-frequency resource blocks, and each time-frequency resource block contains 8 sub-carriers.
Step 302: and aiming at each time-frequency resource block, determining the corresponding relation between the subcarrier position in the time-frequency resource block and data.
In the embodiment of the present invention, the correspondence between the position of the subcarrier in each time-frequency resource block and the data is respectively determined for the 4 time-frequency resource blocks described in step 301. Table 1 shows the correspondence of the positions of the individual subcarriers to QPSK data.
Table 1 (subcarrier position corresponding to QPSK data)
In this embodiment, the data corresponding to the subcarrier position may further include: 0 or 1 bit data, digital modulation data such as BPSK and QAM, and other forms of data.
Step 303: and selecting corresponding subcarriers on OFDM symbols for the data to be transmitted according to the corresponding relation between the subcarrier positions and the data.
In this embodiment, taking the third OFDM symbol of the first time frequency resource block as an example, if 4 QPSK data information to be transmitted are loaded, they are respectively
Then the sub-carrier corresponding to the selected position includes, but is not limited to, the following methods: the subcarriers are selected using the 2 nd and 4 th data. According to the corresponding relation in table 1 in step 302, the 3rd and 6 th sub-carrier load data should be selected.
Step 304: and mapping the data to be transmitted to the selected subcarriers.
In this embodiment, according to the method described in steps 302 and 303, the 1 st and 3rd data are mapped to subcarriers 3 and 6, respectively, and subcarriers 3 and 6 indicate data respectively
And
the present embodiment is not limited to a multicarrier system with a bandwidth of 5MHz, and a multicarrier system with any value bandwidth, such as 2.5MHz, 10MHz, 20MHz, 100MHz, etc., and the data modulation method of the edge subband described in the present embodiment may be used in the same way.
Fig. 4 is a schematic structural composition diagram of a data modulation apparatus for edge subbands according to an embodiment of the present invention, as shown in fig. 4, the apparatus includes:
a selecting unit 41, configured to select a subcarrier on edge subbands at two ends of a transmission band, where a position of the subcarrier represents modulation information;
and a modulation unit 42 for modulating the data according to the position of the selected subcarrier.
In this embodiment of the present invention, the position of the subcarrier represents modulation information, which includes:
the position of a single subcarrier characterizes one modulation information, or the position combination of a plurality of subcarriers characterizes one modulation information.
In the embodiment of the present invention, the apparatus further includes:
a dividing unit 43, configured to divide the edge sub-band into multiple time-frequency resource blocks;
a determining unit 44, configured to determine, for each time-frequency resource block, a corresponding relationship between a position of a subcarrier in the time-frequency resource block and data;
the selecting unit 41 is specifically configured to select a corresponding subcarrier for the data to be transmitted based on a corresponding relationship between the positions of the subcarriers and the data;
the modulation unit 42 is specifically configured to map the data to be transmitted onto the selected subcarriers.
In this embodiment of the present invention, the dividing unit 43 is specifically configured to divide the edge subband into p time-frequency resource blocks, where p is an integer greater than or equal to 1, and the number of subcarriers included in different time-frequency resource blocks is the same or different.
In the embodiment of the invention, the data volume of the data to be transmitted of different time-frequency resource block loads is the same or different.
In the embodiment of the present invention, the selecting unit 41 is specifically configured to select subcarriers on time domain symbols of the time-frequency resource block for data to be transmitted, where the number of subcarriers selected on different time domain symbols is the same or different, and the positions of subcarriers selected on different time domain symbols are the same or different.
In practical applications, the selecting Unit 41, the dividing Unit 43, and the determining Unit 44 may be implemented by a Central Processing Unit (CPU), a microprocessor Unit (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like in the data modulation device of the edge subband. The modulation unit 42 may be implemented by a modem.
It will be understood by those skilled in the art that the implementation functions of each unit in the data modulation apparatus for the edge subband shown in fig. 4 can be understood by referring to the related description of the data modulation method for the edge subband. The functions of the units in the data modulation apparatus for edge subbands shown in fig. 4 may be implemented by a program running on a processor, or may be implemented by specific logic circuits.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for data modulation of an edge subband, the method comprising:
selecting subcarriers on edge subbands at two ends of a transmission band, wherein the positions of the subcarriers represent modulation information;
modulating data according to the position of the selected subcarrier;
selecting sub-carriers on edge sub-bands at two ends of a transmission band, and modulating data according to the positions of the selected sub-carriers, wherein the method comprises the following steps:
dividing the edge sub-band into a plurality of time-frequency resource blocks;
determining the corresponding relation between the position of a subcarrier in each time-frequency resource block and data aiming at each time-frequency resource block;
selecting corresponding subcarriers for the data to be transmitted based on the corresponding relation between the positions of the subcarriers and the data;
mapping the data to be transmitted to the selected subcarriers;
the corresponding relation between the positions of the subcarriers and the data is determined in a single time-frequency resource block, or the corresponding relation between the positions of the subcarriers and the data is determined in a plurality of combined time-frequency resource blocks.
2. The method of claim 1, wherein the position of the subcarrier characterizes modulation information, comprising:
the position of a single subcarrier characterizes one modulation information, or the position combination of a plurality of subcarriers characterizes one modulation information.
3. The method of claim 1, wherein the dividing the edge sub-band into a plurality of time-frequency resource blocks comprises:
and dividing the edge sub-band into p time-frequency resource blocks, wherein p is an integer greater than or equal to 1, and the number of subcarriers included in different time-frequency resource blocks is the same or different.
4. The method according to claim 1 or 3, wherein the data amount of the data to be transmitted is the same or different for different time-frequency resource block loads.
5. The method of claim 1, wherein selecting the corresponding subcarrier for the data to be transmitted comprises:
and selecting subcarriers on time domain symbols of the time frequency resource block for the data to be transmitted, wherein the number of the subcarriers selected on different time domain symbols is the same or different, and the positions of the subcarriers selected on different time domain symbols are the same or different.
6. An apparatus for data modulation of an edge subband, the apparatus comprising:
a selecting unit, configured to select a subcarrier on edge subbands at two ends of a transmission band, where a position of the subcarrier represents modulation information;
a modulation unit for modulating data according to the position of the selected subcarrier;
the device further comprises:
the dividing unit is used for dividing the edge sub-band into a plurality of time-frequency resource blocks;
a determining unit, configured to determine, for each time-frequency resource block, a corresponding relationship between a position of a subcarrier in the time-frequency resource block and data;
the selection unit is specifically configured to select a corresponding subcarrier for the data to be transmitted based on a correspondence between the positions of the subcarriers and the data;
the modulation unit is specifically configured to map the data to be transmitted to the selected subcarrier;
the corresponding relation between the positions of the subcarriers and the data is determined in a single time-frequency resource block, or the corresponding relation between the positions of the subcarriers and the data is determined in a plurality of combined time-frequency resource blocks.
7. The apparatus of claim 6, wherein the position of the subcarrier characterizes modulation information, comprising:
the position of a single subcarrier characterizes one modulation information, or the position combination of a plurality of subcarriers characterizes one modulation information.
8. The apparatus according to claim 6, wherein the dividing unit is specifically configured to divide the edge sub-band into p time-frequency resource blocks, where p is an integer greater than or equal to 1, and the number of subcarriers included in different time-frequency resource blocks is the same or different.
9. The apparatus according to claim 6 or 8, wherein the data amount of the data to be transmitted is the same or different for different time-frequency resource block loads.
10. The apparatus according to claim 6, wherein the selecting unit is specifically configured to select subcarriers on time domain symbols of the time-frequency resource block for data to be transmitted, where the number of subcarriers selected on different time domain symbols is the same or different, and the positions of subcarriers selected on different time domain symbols are the same or different.
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| PCT/CN2018/078049 WO2018161875A1 (en) | 2017-03-06 | 2018-03-05 | Data modulation method and device for edge sub-band, and computer storage medium |
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| CN105009539A (en) * | 2013-03-13 | 2015-10-28 | 索尼公司 | 6mhz bandwidth ofdm transmitter with the same guard interval as 8mhz dvb-t2 |
| CN103595685A (en) * | 2013-11-27 | 2014-02-19 | 电子科技大学 | SIM-OFDM communication method |
| CN104580053A (en) * | 2014-12-02 | 2015-04-29 | 江苏中兴微通信息科技有限公司 | Transceiving method and device for realizing OFDMA technology in broad band wireless local area network |
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| Publication number | Publication date |
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| CN108540418A (en) | 2018-09-14 |
| WO2018161875A1 (en) | 2018-09-13 |
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