CN109495981B - OFDM-based data transmission method, device, equipment and storage medium - Google Patents

OFDM-based data transmission method, device, equipment and storage medium Download PDF

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CN109495981B
CN109495981B CN201811570729.7A CN201811570729A CN109495981B CN 109495981 B CN109495981 B CN 109495981B CN 201811570729 A CN201811570729 A CN 201811570729A CN 109495981 B CN109495981 B CN 109495981B
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data
ofdm
time domain
ofdm symbol
wireless frame
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CN109495981A (en
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邵枝晖
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Beijing Neuron Network Technology Co ltd
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Beijing Neuron Network Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • 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
    • H04L27/2602—Signal structure
    • H04L27/2611—

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention discloses a data transmission method, a device, equipment and a storage medium based on OFDM, wherein the data transmission method based on OFDM comprises the following steps: and in the discrete mode, a wireless frame bears service data on continuous M OFDM symbols of the same subcarrier, and a continuous mode bears periodic control data, wherein in the continuous mode, the wireless frame bears the control data on continuous K subcarriers of the same time domain, and a plurality of data transmitted in parallel are borne in the wireless frame according to different data types and are transmitted to the wireless frame. The invention discloses a data transmission method, a device, equipment and a storage medium based on OFDM, which are used for realizing the real-time transmission of multi-concurrent data.

Description

OFDM-based data transmission method, device, equipment and storage medium
Technical Field
The embodiments of the present invention relate to network technologies, and in particular, to a method, an apparatus, a device, and a storage medium for data transmission based on OFDM.
Background
In the industrial internet, the communication of control data is mainly realized by adopting a bus mode. In the current industrial internet, a control bus is a narrow-band transmission bus, a single carrier technology is adopted, and data is transmitted in a time-sharing mode based on time slicing. And for various types of service data, the transmission is carried out according to the service priority.
However, for multi-service transmission, the current bus transmission method is easy to cause bus blocking. With the enlargement of the scale of the industrial internet, the number of access devices is continuously increased, and the data transmission mode of the current control bus cannot meet the high-speed and real-time transmission requirement of data.
Disclosure of Invention
The invention provides a data transmission method, a device, equipment and a storage medium based on OFDM (orthogonal frequency division multiplexing) so as to realize real-time transmission of multi-concurrent data.
In a first aspect, an embodiment of the present invention provides a data transmission method based on OFDM, including:
determining a data type of a plurality of data transmitted concurrently, wherein the data type comprises periodic control data and aperiodic service data;
adopting a discrete mode to bear aperiodic service data, wherein in the discrete mode, a wireless frame bears the service data on continuous M OFDM symbols of the same subcarrier;
carrying periodic control data by adopting a continuous mode, wherein in the continuous mode, a wireless frame carries the control data by continuous K subcarriers in the same time domain;
and carrying the multiple data which are transmitted concurrently in a wireless frame according to different data types, and then sending the wireless frame.
In a possible implementation manner of the first aspect, in the discrete mode, the radio frame carries the pilot sequence in an nth OFDM symbol in the time domain, and M consecutive OFDM symbols of the same subcarrier in the frequency domain after the nth OFDM symbol in the time domain carry the service data.
In a possible implementation manner of the first aspect, in the discrete mode, values of N and M are configured according to a requirement for carrying data and a state of a transmission channel, where the state of the transmission channel is inversely proportional to the value of M.
In a possible implementation manner of the first aspect, in the scattered mode, a pilot sequence carried in an nth OFDM symbol in the time domain is used to perform channel estimation on M OFDM symbols after the nth OFDM symbol in the time domain.
In a possible implementation manner of the first aspect, in the continuous mode, the radio frame carries the pilot sequence of the same user in each OFDM symbol of the time domain, and K subcarriers of the same time domain after the OFDM symbol carrying the pilot sequence carry control data.
In a possible implementation manner of the first aspect, in the continuous mode, the pilot sequence carried by the radio frame in each OFDM symbol in the time domain is used to perform channel estimation on K subcarriers in the same time domain after each OFDM symbol in the time domain.
In a possible implementation manner of the first aspect, the radio frame further includes a synchronization signal, where the synchronization signal occupies multiple subcarriers in a frequency domain corresponding to a first OFDM symbol in a time domain.
In a second aspect, an embodiment of the present invention further provides an OFDM-based data transmission apparatus, including:
the data type determining module is used for determining the data types of a plurality of data which are transmitted concurrently, wherein the data types comprise periodic control data and aperiodic service data;
the discrete mode processing module is used for adopting a discrete mode to bear aperiodic service data, wherein in the discrete mode, a wireless frame bears the service data on continuous M OFDM symbols of the same subcarrier;
the continuous mode processing module is used for adopting a continuous mode to bear the periodic control data, wherein in the continuous mode, the wireless frame bears the control data in continuous K subcarriers of the same time domain;
and the data transmission module is used for bearing a plurality of data which are transmitted concurrently in a wireless frame according to different data types and then transmitting the wireless frame.
In a third aspect, an embodiment of the present invention further provides an OFDM-based data transmission device, including:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement a method for OFDM-based data transmission as described in any one of the implementations of the first aspect.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the OFDM-based data transmission method according to any implementation manner of the first aspect
According to the OFDM-based data transmission method, device, equipment and storage medium provided by the embodiment of the invention, by determining the data types of a plurality of data which are transmitted concurrently, aperiodic service data are borne in a discrete mode, wherein in the discrete mode, a wireless frame bears service data on continuous M OFDM symbols of the same subcarrier, and a continuous mode bears periodic control data, wherein in the continuous mode, a wireless frame bears control data on continuous K subcarriers of the same time domain, and after the plurality of data which are transmitted concurrently are borne in the wireless frame according to different data types, the wireless frame is sent, so that the real-time transmission of the plurality of concurrent data is realized, and the method, device, equipment and storage medium are applied to bus transmission in the industrial Internet, can realize the real-time transmission of the plurality of concurrent data in the industrial Internet, and are suitable for the industrial Internet which is developed in a large scale at present.
Drawings
Fig. 1 is a flowchart of a first embodiment of a method for transmitting data based on OFDM according to the present invention;
FIG. 2 is a schematic diagram of a discrete mode bearer;
FIG. 3 is a schematic view of a continuous mode bearer;
FIG. 4 is a schematic diagram of OFDM radio frame resource allocation;
fig. 5 is a schematic structural diagram of a first embodiment of an OFDM-based data transmission apparatus according to the present invention;
fig. 6 is a schematic structural diagram of an OFDM-based data transmission device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Industrial internet is a network used in an industrial environment to serve industrial production, and as the networking scale of industrial equipment increases, the demand for industrial internet also increases. In the industrial internet, communication of each device is realized in a Bus manner, and currently adopted buses include a Controller Area Network (CAN) Bus, a Process Field Bus (PROFIBUS) Bus, and the like. However, the bus mainly adopts a single carrier technology, and the transmission bandwidth is low, which results in a slow transmission rate. When the number of devices in the network is large, a situation that a plurality of data are concurrent may occur, and the requirement for real-time data transmission cannot be met by adopting a single-carrier bus for transmission, which may affect industrial production. Accordingly, the present invention provides a data transmission method based on Orthogonal Frequency Division Multiplexing (OFDM), thereby solving the above-mentioned problems.
Fig. 1 is a flowchart of a first embodiment of a data transmission method based on OFDM according to an embodiment of the present invention, and as shown in fig. 1, the method according to this embodiment includes:
step S101, determining the data type of a plurality of data transmitted concurrently, wherein the data type comprises periodic control data and aperiodic service data.
In the scenario of increasing devices in an industrial network, data transmission between devices is often concurrent, that is, there are multiple data to be transmitted in the network at the same time, and each data may belong to different devices or different users. Because the traditional industrial internet adopts a single carrier technology, service data are transmitted in a time-sharing mode based on time slicing, so that each service data can be transmitted in sequence only according to priority, transmission blockage is easy to cause, and real-time transmission of the data cannot be realized.
Therefore, the invention adopts the broadband transmission technology of the physical layer based on OFDM, and realizes the real-time transmission of the data by configuring different types of data on the frequency domain and the time domain. OFDM is a multi-carrier modulation technique that divides a channel into several orthogonal sub-channels, converts a high-speed data signal into parallel low-speed sub-streams, and modulates the sub-streams onto each sub-channel for transmission. The orthogonal signals can be separated by using correlation techniques at the receiving end, which can reduce mutual interference between the sub-channels. The signal bandwidth on each subchannel is smaller than the associated bandwidth of the channel, so that flat fading can be seen on each subchannel, thereby eliminating inter-symbol interference, and since the bandwidth of each subchannel is only a small fraction of the original channel bandwidth, channel equalization becomes relatively easy.
After data transmitted in the industrial internet is analyzed, the data can be classified into two types according to different properties of the data, wherein one type is periodic control data, and the other type is aperiodic service data. The periodic control data is data for controlling each device in the network or feeding back a control instruction, and is characterized by fixed data size and periodic transmission. The other is aperiodic service data, which is actual service data transmitted between devices, and is characterized in that the data size is not fixed and is transmitted aperiodically. Because the two types of data have different properties, different strategies need to be adopted to allocate transmission resources for the two types of data, so that the real-time transmission of the data is realized. Therefore, in order to transmit data in an industrial network in real time, it is necessary to specify a plurality of data to be transmitted concurrently on a bus in the network, and then specify the data type of each data. The data type corresponding to the data may be determined according to whether the data is periodically transmitted data, and if the data has the characteristic of periodic transmission, the data type may be determined as periodic control data, and if the data does not have the characteristic of periodic transmission, the data type may be determined as aperiodic service data. Particularly, the data type of the data can be further judged according to the real-time requirement of the data, and if the real-time requirement of the data transmission is high, the data can be divided into aperiodic service data no matter whether the data has the characteristic of periodic transmission or not.
In addition, the concurrent data may only have periodic control data or only aperiodic service data, and more frequently, both periodic control data and aperiodic service data are available.
Step S102, adopting a discrete mode to bear aperiodic service data, wherein in the discrete mode, a wireless frame bears the service data on continuous M OFDM symbols of the same subcarrier.
After determining the data type of the multiple data transmitted concurrently, it is necessary to adopt different strategies to allocate transmission resources for the multiple data. And for the aperiodic service data, allocating transmission resources for the aperiodic service data by adopting a discrete mode. For periodic control data, transmission resources are allocated thereto in a continuous mode.
Before describing the allocation of the transmission resources, the present embodiment first briefly describes the allocation of the physical layer transmission resources. For the OFDM technology, data packets transmitted by the OFDM technology are referred to as radio frames, a physical layer of each radio frame may be divided in a frequency domain and a time domain, the frequency domain of each radio frame may be divided into a plurality of subcarriers, each subcarrier occupies a certain bandwidth, and the number of subcarriers in each radio frame and the bandwidth of each subcarrier are different according to an adopted OFDM scheme. In the time domain, each wireless frame occupies a fixed time slot, and then each time slot is divided into a plurality of OFDM symbols in the time domain, and the length of the time slot occupied by each wireless frame and the number of the OFDM symbols included in each time slot are also distinguished according to the adopted OFDM system. In short, a radio frame is composed of several subcarriers in the frequency domain and several OFDM symbols in the time domain, and each OFDM symbol can carry various data.
When data transmission is performed, after a sending end bears data to be sent on an OFDM symbol according to a certain rule, a receiving end can acquire and analyze the data from the corresponding OFDM symbol, and therefore data transmission is completed.
For aperiodic service data, because the size of the aperiodic service data is uncertain, and the data may be data with high bandwidth requirements such as video, image, and the like, a data carrying manner capable of flexibly configuring the size needs to be set for the aperiodic service data. In this embodiment, in the discrete mode, the radio frame carries traffic data on M consecutive OFDM symbols of the same subcarrier, that is, in one subcarrier, aperiodic traffic data is carried in M consecutive OFDM symbols. If the bandwidth required by the aperiodic service data is small, one subcarrier can also carry a plurality of service data. Since a radio frame includes multiple subcarriers, each subcarrier can carry one or more service data, so that multiple aperiodic service data can be simultaneously carried in one radio frame.
Further, in order to enable the receiving end to accurately implement data reception, when the transmitting end transmits data, it is further required to add a pilot sequence to the data, where the pilot sequence is a special signal and is used to estimate a channel carrying the data, so as to improve a success rate of data transmission. In an OFDM radio frame, one or more OFDM symbols may be used to carry pilot signals before each OFDM symbol that actually carries data to ensure successful transmission of the data. For example, the radio frame carries the pilot sequence in the nth OFDM symbol in the time domain, and carries the service data in the consecutive M OFDM symbols of the same subcarrier in the frequency domain after the nth OFDM symbol in the time domain. That is, in one subcarrier, the nth OFDM symbol and the following M OFDM symbols carry aperiodic traffic data, wherein the nth OFDM symbol is used for carrying pilot signals. As shown in fig. 2, fig. 2 is a schematic diagram of a discrete mode bearer, in fig. 2, a horizontal axis represents a time domain, a vertical axis represents a frequency domain, each square grid represents one OFDM symbol, a pilot signal is carried in a black OFDM symbol, and a plurality of OFDM symbols after the black OFDM symbol are used for carrying service data.
In the scattered mode, the pilot sequence carried in the nth OFDM symbol in the time domain is used for performing channel estimation on M consecutive OFDM symbols after the nth OFDM symbol in the time domain. Since the difference in channel quality means that the capability of channel estimation according to the pilot sequence is also different, the number of M OFDM symbols that can be estimated according to the pilot sequence carried in the nth OFDM symbol is also different. Generally, the state of the transmission channel is inversely proportional to M, the value of M may increase when the channel state is good, i.e. the channel changes slowly, and the value of M may decrease when the channel state is poor, i.e. the channel changes rapidly.
Step S103, a continuous mode is adopted to carry the periodic control data, wherein in the continuous mode, the continuous K subcarriers of the wireless frame in the same time domain carry the control data.
For the periodic control data, since the size is fixed, the required bandwidth is also generally fixed, and therefore, a data carrying manner with a fixed size can be set for the periodic control data. In this embodiment, in the continuous frequency mode, a radio frame carries control data on K consecutive subcarriers in the same time domain, that is, periodic control data is carried in K consecutive OFDM symbols corresponding to OFDM symbols in one time domain. So that each OFDM symbol in the time domain can carry a different periodic control data. In this mode, the minimum time granularity of resource scheduling is one OFDM symbol, which is suitable for a high real-time communication scenario. This enables concurrent transmission of multiple control data at the same time for multiple devices and users throughout the industrial internet.
Further, in order to enable the receiving end to accurately implement data reception, in the continuous mode, a pilot sequence may also be added, each OFDM symbol of the radio frame in the time domain carries the pilot sequence, and K subcarriers of the same time domain carry control data after the OFDM symbol carrying the pilot sequence. As shown in fig. 3, fig. 3 is a schematic diagram of continuous mode bearer, in fig. 3, a horizontal axis represents a time domain, a vertical axis represents a frequency domain, each square grid represents one OFDM symbol, a pilot signal is carried in a black OFDM symbol, and a plurality of OFDM symbols below the black OFDM symbol are used for carrying service data.
In the continuous mode, the radio frame carries a pilot sequence in each OFDM symbol in the time domain, and is used to perform channel estimation on K subcarriers in the same time domain after each OFDM symbol in the time domain.
It should be noted that, after determining the data type of the multiple concurrently transmitted data, step S102 and step S103 are executed in parallel, that is, after determining the data type of the multiple concurrently transmitted data, the multiple concurrently transmitted data are processed at the physical layer according to the discrete mode and the continuous mode, and then step S104 is executed.
And step S104, after bearing the multiple data which are transmitted concurrently in the wireless frame according to different data types, sending the wireless frame.
After carrying multiple pieces of data which are transmitted concurrently in a wireless frame according to different data types, the wireless frame can be sent, and after a receiving end receives the wireless frame, channel estimation can be performed on OFDM symbols carrying the data according to the OFDM symbols carrying the pilot frequency sequence, and finally data receiving is achieved.
Because the concurrently transmitted data are distinguished according to different data types and are borne in different resources in the OFDM wireless frame according to the OFDM technology, the real-time transmission of the multiple concurrent data is finally realized. The OFDM-based data transmission method provided by the embodiment is applied to bus transmission in the industrial internet, can realize real-time transmission of multiple concurrent data in the industrial internet, and is suitable for the industrial internet which is developed in a large scale at present.
In the OFDM-based data transmission method provided in this embodiment, a discrete mode is used to carry aperiodic service data by determining data types of multiple data to be transmitted concurrently, where in the discrete mode, a wireless frame carries service data on consecutive M OFDM symbols of the same subcarrier, and a continuous mode is used to carry periodic control data, where in the continuous mode, a wireless frame carries control data on consecutive K subcarriers of the same time domain, and after multiple data to be transmitted concurrently are carried in the wireless frame according to different data types, the wireless frame is sent, so that real-time transmission of multiple concurrent data is realized.
Further, for each radio frame of OFDM, a synchronization signal needs to be included, and since the synchronization signal needs to be processed first, the synchronization signal occupies multiple subcarriers in a frequency domain corresponding to a first OFDM symbol in a time domain.
The following takes a complete radio frame as an example, and further details the allocation manner of radio frame resources in the OFDM-based data transmission method provided in the embodiment of the present invention. Fig. 4 is a schematic diagram of OFDM radio frame resource allocation. Wherein the frequency domain includes 44 subcarriers and the time domain includes 16 OFDM symbols. In order to implement the parallel real-time transmission of the periodic control data and the aperiodic service data, the whole radio frame may be divided into two parts in the frequency domain, wherein the upper part is used for carrying the aperiodic service data, and the lower part is used for carrying the periodic control data. In the upper half frequency band of the frequency domain corresponding to the first OFDM symbol of the OFDM radio frame, a synchronization signal is carried. In the 2 nd, 5 th and 11 th OFDM symbols of the time domain, a pilot sequence of aperiodic service is carried, and a plurality of OFDM symbols behind the same subcarrier after the pilot sequence are used for carrying aperiodic service data. As can be seen from the figure, one OFDM radio frame can simultaneously carry a plurality of aperiodic traffic data. It should be noted that the positions and the numbers of the pilot sequences of the aperiodic traffic data and the OFDM symbols carrying the traffic data may be set according to actual requirements, and are not limited in the drawing. The OFDM wireless frame comprises a first sub-carrier and a second sub-carrier, wherein the first sub-carrier corresponds to the 23 th sub-carrier and the 24 th sub-carrier of the frequency domain, the second sub-carrier corresponds to the 23 th sub-carrier of the frequency domain, and the first sub-carrier corresponds to the second sub-carrier of the frequency domain. As can be seen from the figure, one OFDM radio frame can simultaneously carry multiple pieces of periodic control data.
For pilot signals in the scattered mode in the present invention, it may be referred to as scattered pilots, and when the reference signal r (m) is mapped to the resource element (k, l), for example: according to ak,lR (8 × l + k) l — ofdm symbol number. That is, the data channel scattered pilots should be mapped to OFDM symbols, r (m) should map resource elements (k, l) starting from k being 0 and m being 8 l + k, and the mapping of resource elements (k, l) should be performed in an ascending order of m. According to the channel condition and the transmission bandwidth requirement, the scattered pilot frequency symbol is followed by M data symbols to carry service data, and the scattered pilot frequency carries out real-time channel estimation on the M data symbols.
For pilot signals in the continuous mode in the present invention, which may be referred to as continuous pilots, reference signals r (m) are mapped to resource elements (k, l) according to
ak,lR (k) l-OFDM symbol number
k is j Krc + N is Krc is carrier number of one resource block, j is resource block serial number of OFDM symbol upper/lower sideband
m is pilot frequency serial number in resource block, N is pilot frequency interval allocable
That is, the continual pilots should be mapped to OFDM symbols, r (k) should map resource elements (k, l) starting from j ═ 0 and m ═ 0, the mapping of resource elements (k, l) should be performed in the order of physical resource blocks, and k ═ j × Krc + N × m inside the resource blocks should be performed in the ascending order of m. The data sub-carriers in the same symbol on the frequency domain can be allocated to different users or the same user according to the requirements of the users; in time domain, the symbols can be allocated to different users periodically, or a plurality of symbols can be allocated to the same user continuously. The continuous pilot ensures real-time channel estimation for each user.
Fig. 5 is a schematic structural diagram of a first embodiment of an OFDM-based data transmission apparatus according to an embodiment of the present invention, and as shown in fig. 5, the OFDM-based data transmission apparatus according to the present embodiment includes:
the data type determining module 51 is configured to determine a data type of a plurality of data to be transmitted concurrently, where the data type includes periodic control data and aperiodic traffic data.
A discrete mode processing module 52, configured to use a discrete mode to carry aperiodic service data, where in the discrete mode, a radio frame carries service data on consecutive M OFDM symbols of the same subcarrier.
The continuous mode processing module 53 is configured to use a continuous mode to carry the periodic control data, where in the continuous mode, the radio frame carries the control data on consecutive K subcarriers in the same time domain.
The data transmission module 54 is configured to load multiple pieces of concurrently transmitted data in a wireless frame according to different data types, and then send the wireless frame.
The OFDM-based data transmission apparatus provided in this embodiment is used to implement the OFDM-based data transmission method provided in the embodiment shown in fig. 1, and the implementation principle and technical effect are similar, and are not described herein again.
Further, on the basis of the embodiment shown in fig. 5, in the discrete mode, the radio frame carries the pilot sequence in the nth OFDM symbol in the time domain, and the continuous M OFDM symbols of the same subcarrier in the frequency domain after the nth OFDM symbol in the time domain carry the service data.
Further, on the basis of the embodiment shown in fig. 5, in the discrete mode, the values of N and M are configured according to the requirement of carrying data and the state of the transmission channel, wherein the state of the transmission channel is inversely proportional to the value of M.
Further, on the basis of the embodiment shown in fig. 5, in the scattered mode, the pilot sequence carried in the nth OFDM symbol in the time domain is used to perform channel estimation on M OFDM symbols after the nth OFDM symbol in the time domain.
Further, on the basis of the embodiment shown in fig. 5, in the continuous mode, the radio frame carries the pilot sequence of the same user in each OFDM symbol of the time domain, and K subcarriers of the same time domain after the OFDM symbol carrying the pilot sequence carry control data.
Further, on the basis of the embodiment shown in fig. 5, in the continuous mode, the pilot sequence carried by the radio frame in each OFDM symbol in the time domain is used to perform channel estimation on K subcarriers in the same time domain after each OFDM symbol in the time domain.
Further, on the basis of the embodiment shown in fig. 5, the radio frame further includes a synchronization signal, and the synchronization signal occupies a plurality of subcarriers in a frequency domain corresponding to the first OFDM symbol in the time domain.
Fig. 6 is a schematic structural diagram of an OFDM-based data transmission device according to an embodiment of the present invention, and as shown in fig. 6, the OFDM-based data transmission device includes a processor 61 and a memory 62; the number of the processors 61 in the OFDM-based data transmission apparatus may be one or more, and one processor 61 is taken as an example in fig. 6; the processor 61 and the memory 62 in the OFDM-based data transmission device may be connected by a bus or other means, and fig. 6 illustrates the connection by a bus as an example.
The memory 62 is a computer readable storage medium, and can be used for storing software programs, computer executable programs, and modules, such as program instructions/modules corresponding to the OFDM-based data transmission method in the embodiment of fig. 1 (for example, the data type determining module 51, the discrete mode processing module 52, the continuous mode processing module 53, and the data transmission module 54 in the OFDM-based data transmission apparatus). The processor 61 implements the OFDM-based data transmission method described above by executing software programs, instructions, and modules stored in the memory 62, thereby applying various functions of the OFDM-based data transmission apparatus and processing data.
The memory 62 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the OFDM-based data transmission apparatus, and the like. Further, the memory 62 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device.
Embodiments of the present application also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for OFDM-based data transmission, the method comprising:
determining a data type of a plurality of data transmitted concurrently, wherein the data type comprises periodic control data and aperiodic service data;
adopting a discrete mode to bear aperiodic service data, wherein in the discrete mode, a wireless frame bears the service data on continuous M OFDM symbols of the same subcarrier;
carrying periodic control data by adopting a continuous mode, wherein in the continuous mode, a wireless frame carries the control data by continuous K subcarriers in the same time domain;
and carrying the multiple data which are transmitted concurrently in a wireless frame according to different data types, and then sending the wireless frame.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the OFDM-based data transmission apparatus, the units and modules included in the OFDM-based data transmission apparatus are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (8)

1. A method for transmitting data based on OFDM, comprising:
determining the data type of a plurality of data transmitted concurrently, wherein the data type comprises periodic control data and aperiodic service data, and if the real-time requirement of data transmission is high, the data with the characteristic of periodic transmission is divided into aperiodic service data;
dividing the whole wireless frame into two parts in a frequency domain, wherein the upper part is used for bearing aperiodic service data, and the lower part is used for bearing periodic control data;
based on frequency domain division, adopting a discrete mode to bear the aperiodic service data, wherein in the discrete mode, a wireless frame bears the service data on continuous M OFDM symbols of the same subcarrier;
adopting a continuous mode to bear the periodic control data, wherein in the continuous mode, continuous K subcarriers of a wireless frame in the same time domain bear the control data;
after carrying a plurality of data which are transmitted concurrently in a wireless frame according to different data types, sending the wireless frame;
in the discrete mode, a wireless frame bears a pilot frequency sequence in the Nth OFDM symbol of a time domain, and continuous M OFDM symbols of the same subcarrier in a frequency domain bear service data behind the Nth OFDM symbol of the time domain;
in the continuous mode, a radio frame bears a pilot sequence of the same user in each OFDM symbol of a time domain, and K sub-carriers of the same time domain bear control data after the OFDM symbol of the pilot sequence.
2. The method of claim 1, wherein in the discrete mode, values of N and M are configured according to a requirement for carrying data and a status of a transmission channel, wherein the status of the transmission channel is inversely proportional to the value of M.
3. The method according to claim 1 or 2, wherein in the scattered mode, the pilot sequence carried in the nth OFDM symbol in the time domain is used for channel estimation of M OFDM symbols after the nth OFDM symbol in the time domain.
4. The method of claim 1, wherein in the continuous mode, the radio frame carries a pilot sequence in each OFDM symbol in the time domain for channel estimation on K subcarriers in the same time domain after each OFDM symbol in the time domain.
5. The method according to any of claims 1-2 and 4, wherein the radio frame further comprises a synchronization signal, and the synchronization signal occupies a plurality of subcarriers in a frequency domain corresponding to a first OFDM symbol in a time domain.
6. An OFDM-based data transmission apparatus, comprising:
the data type determining module is used for determining the data types of a plurality of data which are transmitted concurrently, wherein the data types comprise periodic control data and aperiodic service data, and if the real-time requirement of the data transmission is high, the data with the characteristic of periodic transmission is divided into aperiodic service data;
dividing the whole wireless frame into two parts in a frequency domain, wherein the upper part is used for bearing aperiodic service data, and the lower part is used for bearing periodic control data;
based on frequency domain division, a discrete mode processing module is used for adopting a discrete mode to bear the aperiodic service data, wherein in the discrete mode, a wireless frame bears the service data on continuous M OFDM symbols of the same subcarrier;
a continuous mode processing module, configured to use a continuous mode to carry the periodic control data, where in the continuous mode, a radio frame carries control data in consecutive K subcarriers of the same time domain;
the data transmission module is used for bearing a plurality of data which are transmitted concurrently in a wireless frame according to different data types and then transmitting the wireless frame;
in the discrete mode, a wireless frame bears a pilot frequency sequence in the Nth OFDM symbol of a time domain, and continuous M OFDM symbols of the same subcarrier in a frequency domain bear service data behind the Nth OFDM symbol of the time domain;
in the continuous mode, a radio frame bears a pilot sequence of the same user in each OFDM symbol of a time domain, and K sub-carriers of the same time domain bear control data after the OFDM symbol of the pilot sequence.
7. An OFDM-based data transmission apparatus, comprising:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the OFDM-based data transmission method as claimed in any one of claims 1 to 5.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method for OFDM-based data transmission according to any one of claims 1 to 5.
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