CN111294169A - Discrete sub-band data transmission method and device based on orthogonal frequency division multiplexing - Google Patents
Discrete sub-band data transmission method and device based on orthogonal frequency division multiplexing Download PDFInfo
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- CN111294169A CN111294169A CN201811494356.XA CN201811494356A CN111294169A CN 111294169 A CN111294169 A CN 111294169A CN 201811494356 A CN201811494356 A CN 201811494356A CN 111294169 A CN111294169 A CN 111294169A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/0008—Wavelet-division
Abstract
The invention discloses a discrete sub-band data transmission method and a discrete sub-band data transmission device based on orthogonal frequency division multiplexing. Wherein the method comprises the following steps: performing serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset; synthesizing the digitally mixed signals of each sub-band to obtain baseband signals; the baseband signal is carrier modulated and the carrier modulated baseband signal is transmitted from the air interface. The device is used for executing the method. The discrete sub-band data transmission method and device based on orthogonal frequency division multiplexing provided by the invention improve the communication efficiency of discrete sub-bands.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a discrete sub-band data transmission method and a discrete sub-band data transmission device based on orthogonal frequency division multiplexing.
Background
With the continuous and deep integration of industrialization and informatization in China, the radio technology and application further permeate into various industry fields, and the contradiction between supply and demand of radio frequency spectrum is increasingly prominent.
The low frequency band below 1GHz is a gold frequency band and has good coverage capability, but due to early technical limitation, most frequency bands are distributed in a narrow band mode, so that a large number of discrete frequency bands are idle. At present, a fixed spectrum allocation policy is adopted in China, and recovery and reuse of allocated frequencies are a very complicated process, so that not only is a long time needed, but also economic compensation is often needed. The existing narrow-band communication technology is limited by a waveform technology, the out-of-band roll-off is slow, and a large transition band needs to be reserved in a band to meet the requirements of related radio frequency indexes, so that the frequency spectrum efficiency is reduced. Orthogonal Frequency Division Multiplexing (OFDM) technology, which is currently the mainstream broadband transmission technology, has a good out-of-band roll-off effect, and if the OFDM technology is used in a low frequency band, the problem of low frequency band spectrum efficiency can be solved, but the OFDM technology is mostly used in a continuous broadband transmission scenario, and low frequency band spectrum resources have few continuous frequency bands and more spectrum fragments, and if the OFDM technology is used in a discrete narrowband spectrum scenario, the problem of coexistence interference with an alien system exists, and if the alien system, for example, a data transmission radio station, works in the passband of the OFDM system, the inter-subcarrier interference of the OFDM system can be caused.
Therefore, how to provide a discrete subband data transmission method based on orthogonal frequency division multiplexing, which can utilize the orthogonal frequency division multiplexing technology to realize the concurrent transmission of a plurality of discrete subbands, so as to improve the communication efficiency of the discrete subbands becomes an important issue to be solved in the industry.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a discrete sub-band data transmission method and a discrete sub-band data transmission device based on orthogonal frequency division multiplexing.
In a first aspect, the present invention provides a method for transmitting discrete subband data based on orthogonal frequency division multiplexing, including:
performing serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset;
synthesizing the digitally mixed signals of each sub-band to obtain baseband signals;
and carrying out carrier modulation on the baseband signal, and sending the baseband signal subjected to the carrier modulation to a receiving device from an air interface.
In a second aspect, the present invention further provides a method for transmitting discrete subband data based on orthogonal frequency division multiplexing, including:
receiving data from an air interface, and dividing the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset;
and performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data, and outputting bit stream data.
In a third aspect, an embodiment of the present invention provides a transmitting apparatus, including:
the conversion unit is used for carrying out serial-parallel conversion on the bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, and each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
the first processing unit is used for processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset;
a synthesis unit, configured to synthesize the digitally-mixed signals of each sub-band to obtain a baseband signal;
and the transmitting unit is used for carrying out carrier modulation on the baseband signal and transmitting the baseband signal subjected to the carrier modulation to the receiving device from an air interface.
In a fourth aspect, an embodiment of the present invention provides a receiving apparatus, including:
a receiving unit, configured to receive data from an air interface, and divide the received data into N paths of parallel data, where each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
the second processing unit is used for processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset;
and the output unit is used for performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data and outputting bit stream data.
In a fifth aspect, an embodiment of the present invention provides an electronic device, including a first memory, a first processor, and a computer program stored in the first memory and executable on the first processor, where the first processor implements the following method for ofdm-based discrete subband data transmission when executing the program:
performing serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset;
synthesizing the digitally mixed signals of each sub-band to obtain baseband signals;
and carrying out carrier modulation on the baseband signal, and sending the baseband signal subjected to the carrier modulation to a receiving device from an air interface.
In a sixth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a first computer program is stored, where the computer program, when executed by a processor, implements the following discrete subband data transmission method based on orthogonal frequency division multiplexing:
performing serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset;
synthesizing the digitally mixed signals of each sub-band to obtain baseband signals;
and carrying out carrier modulation on the baseband signal, and sending the baseband signal subjected to the carrier modulation to a receiving device from an air interface.
In a seventh aspect, an embodiment of the present invention further provides an electronic device, which includes a second memory, a second processor, and a computer program stored in the second memory and executable on the second processor, where the second processor, when executing the program, implements the following method for transmitting discrete subband data based on orthogonal frequency division multiplexing:
receiving data from an air interface, and dividing the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset;
and performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data, and outputting bit stream data.
In an eighth aspect, an embodiment of the present invention provides a non-transitory computer-readable storage medium, on which a second computer program is stored, where the computer program, when executed by a processor, implements the following discrete subband data transmission method based on orthogonal frequency division multiplexing:
receiving data from an air interface, and dividing the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset;
and performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data, and outputting bit stream data.
According to the discrete sub-band data transmission method and device based on orthogonal frequency division multiplexing, input bit stream data can be subjected to serial-parallel conversion according to the bearing capacity of each sub-band, then the data subjected to serial-parallel conversion is processed on each sub-band according to a first processing rule, a digital mixing signal of each sub-band is obtained, then the digital mixing signals of each sub-band are synthesized, a baseband signal is obtained, carrier modulation is carried out on the baseband signal, and the baseband signal subjected to carrier modulation is sent to a receiving device from an air interface, so that parallel communication of a plurality of discrete sub-bands is achieved, and the communication efficiency of the discrete sub-bands is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a flowchart illustrating a discrete subband data transmission method based on orthogonal frequency division multiplexing according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a discrete subband data transmission method based on orthogonal frequency division multiplexing according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating a discrete subband data transmission method based on orthogonal frequency division multiplexing according to another embodiment of the present invention;
fig. 4 is a flowchart illustrating a discrete subband data transmission method based on ofdm according to still another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a transmitting apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a receiving device according to an embodiment of the present invention;
fig. 7 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention;
fig. 8 is a schematic physical structure diagram of an electronic device according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic flowchart of a discrete subband data transmission method based on orthogonal frequency division multiplexing according to an embodiment of the present invention, and as shown in fig. 1, the discrete subband data transmission method based on orthogonal frequency division multiplexing according to the present invention includes:
s101, carrying out serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 KHz;
specifically, the discrete subband data transmission method based on orthogonal frequency division multiplexing according to the embodiment of the present invention performs communication transmission by using an orthogonal frequency division multiplexing technique, performs data transmission on bit stream data to be subjected to communication transmission by using a discrete narrowband, divides each discrete narrowband into a plurality of subbands, and forms a discrete subband with the subbands included in each discrete narrowband. And the sending device carries out serial-parallel conversion according to the bearing capacity of each sub-band, and converts serial bit stream data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band. The carrying capacity of the sub-band depends on the number of sub-carriers included in the sub-band, and the more the number of sub-carriers included in the sub-band is, the more parallel data can be transmitted. The sub-bands are preset, and the bandwidth of each sub-band is 25 KHz. It is understood that N is a positive integer and N is greater than or equal to 2. The number of subcarriers included in the subband is set according to actual needs, and the embodiment of the present invention is not limited.
For example, a frequency spectrum planning may be performed for frequency bands used by 223-235MHz telemetry, remote control, data transmission, and other services, and frequency division is performed in units of 25KHz, where each 25KHz is one of the sub-bands.
S102, processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset;
specifically, after obtaining N parallel data, the transmitting apparatus processes the parallel data corresponding to each subband according to a first processing rule, so as to obtain a digitally-mixed signal of each subband. Wherein the first processing rule is preset.
For example, the first preset rule is: the transmitting device modulates the parallel data corresponding to the sub-band; low-pass filtering the modulated data; up-sampling the low-pass filtered data at a preset sampling frequency; and carrying out digital mixing on the up-sampled data to obtain a digital mixed signal.
S103, synthesizing the digitally mixed signals of each sub-band to obtain baseband signals;
specifically, the transmitting apparatus may obtain baseband signals by obtaining digitally mixed signals of the respective subbands and then synthesizing the digitally mixed signals of the respective subbands. Parallel transmission of a plurality of said sub-bands can be achieved by means of the above-mentioned baseband signal. The specific method for synthesizing the digitally mixed signals of each subband is the prior art, and is not described herein again.
And S104, carrying out carrier modulation on the baseband signal, and sending the baseband signal subjected to the carrier modulation to a receiving device from an air interface.
Specifically, the transmitting apparatus, after obtaining the baseband signal, performs carrier modulation on the baseband signal, and then transmits the carrier-modulated baseband signal from the air interface to the receiving apparatus. The specific process of the carrier modulation of the baseband signal is the prior art, and is not described herein again.
The discrete sub-band data transmission method based on orthogonal frequency division multiplexing provided by the invention can perform serial-parallel conversion on input bit stream data according to the bearing capacity of each sub-band to obtain multi-path parallel data, each path of parallel data corresponds to one sub-band, then the parallel data corresponding to each sub-band is processed according to a first processing rule to obtain a digital mixing signal of each sub-band, then the digital mixing signals of each sub-band are synthesized to obtain a baseband signal, then the baseband signal is subjected to carrier modulation, and the baseband signal subjected to the carrier modulation is sent to a receiving device from an air interface, so that the parallel communication of a plurality of sub-bands is realized, and the communication efficiency of the discrete sub-bands is improved.
Fig. 2 is a flowchart illustrating a discrete subband data transmission method based on orthogonal frequency division multiplexing according to another embodiment of the present invention, where as shown in fig. 2, the first processing rule includes:
s201, modulating the parallel data corresponding to the sub-band;
specifically, after obtaining the parallel data corresponding to each subband, the transmitting device modulates the parallel data corresponding to the subband to obtain modulated data. The data modulation process is the prior art, and is not described herein again.
S202, low-pass filtering is carried out on the modulated data;
specifically, after obtaining the modulated data, the transmitting apparatus performs low-pass filtering on the modulated data by using a filter to obtain low-pass filtered data. The low-pass filtering of the modulated data can reduce the external radiation of the signals in the sub-bands, and the function of inhibiting out-of-band leakage is achieved. The filter is set according to actual needs, and the embodiment of the invention is not limited.
S203, performing up-sampling on the data subjected to the low-pass filtering at a preset sampling frequency;
specifically, in order to subsequently synthesize the digitally mixed signals of each sub-band, the transmitting apparatus performs upsampling on the low-pass filtered data at a first preset sampling frequency to obtain upsampled data, so that the sampling frequency of the upsampled data reaches the first preset sampling frequency. The first preset sampling frequency is set according to actual needs, and the embodiment of the invention is not limited.
And S204, carrying out digital mixing on the up-sampled data to obtain a signal subjected to digital mixing.
Specifically, after the sending device obtains the up-sampled data, digital mixing is performed on the up-sampled data, so that spectrum shifting of the up-sampled data is realized, and the spectrum of the up-sampled data is shifted from a baseband to the corresponding sub-band, so as to obtain a signal after digital mixing.
Based on the above embodiments, further, the effective bandwidth of the sub-band is 22kHz or 22.5 kHz.
Specifically, the bandwidth of the sub-band is 25kHz, and the bandwidth occupied by data transmission on the sub-band cannot be too wide or too narrow in consideration of the design cost and complexity of the filter and the frequency utilization, so the effective bandwidth of the sub-band, which refers to the maximum bandwidth occupied by data transmission on the sub-band, is set to a bandwidth of 22kHz or 22.5 kHz.
On the basis of the foregoing embodiments, further, when the effective bandwidth of the subband is 22.5kHz, the number of subcarriers included in the subband is 6, 8, 9, 10, 12, 15, 18, or 20; when the effective bandwidth of the sub-band is 22kHz, the number of sub-carriers included in the sub-band is 11 or 22.
Specifically, table 1 shows subcarrier intervals and sampling rates corresponding to the number of different subcarriers of subbands with effective bandwidths of 22.5kHz and 22kHz, where to ensure the out-of-band roll-off characteristic of a transmission signal, multiple subcarriers in the subbands are deployed by using an OFDM technique, and preferably, the number of subcarriers included in the subbands is greater than 5; further, considering the selection of the local oscillation frequency, the sampling rate should be an integer multiple of at least one prime number of the three prime numbers 2, 3 or 5, but not an integer multiple of other prime numbers. The number of subcarriers is preferably 6, 8, 9, 10, 12, 15, 18 or 20 for a subband having an effective bandwidth of 22.5kHz, and/11 or 22 for a subband having an effective bandwidth of 22 kHz.
TABLE 1 subcarrier spacing and sampling rate for different subcarrier numbers
Fig. 3 is a schematic flowchart of a discrete subband data transmission method based on orthogonal frequency division multiplexing according to another embodiment of the present invention, and as shown in fig. 3, the discrete subband data transmission method based on orthogonal frequency division multiplexing according to the embodiment of the present invention includes:
s301, receiving data from an air interface, and dividing the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
specifically, the receiving device receives data from an air interface, and then divides the received data into N paths of parallel data according to the central frequency point and the bandwidth of each sub-band, wherein each path of parallel data corresponds to one sub-band. Wherein the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz. It is understood that N is a positive integer and N is greater than or equal to 2.
S302, processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset;
specifically, after obtaining each of the parallel data, the receiving device processes each path of parallel data according to a second processing rule, and may obtain demodulated data corresponding to each path of parallel data. Wherein the second processing rule is preset.
For example, the second processing rule includes: the receiving device carries out digital frequency mixing on each path of parallel data; performing downsampling on each path of parallel data after digital frequency mixing; performing low-pass filtering on each path of parallel data after down sampling; and demodulating each path of parallel data after low-pass filtering to obtain demodulation data corresponding to each path of parallel data.
And S303, performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data, and outputting bit stream data.
Specifically, after obtaining the demodulated data corresponding to each path of parallel data, the receiving device performs parallel-to-serial conversion on the demodulated data corresponding to each path of parallel data, so that the demodulated data corresponding to each path of parallel data is converted into bit stream data to be output.
The discrete sub-band data transmission method based on orthogonal frequency division multiplexing provided by the embodiment of the invention can receive data from an air interface, divide the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band, process each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data, perform parallel-serial conversion on the demodulation data corresponding to each path of parallel data, output bit stream data, realize parallel communication of a plurality of discrete sub-bands and improve the communication efficiency of the discrete sub-bands.
Fig. 4 is a flowchart illustrating a discrete subband data transmission method based on orthogonal frequency division multiplexing according to still another embodiment of the present invention, where as shown in fig. 4, the second processing rule includes:
s401, performing digital mixing on each path of parallel data;
specifically, after obtaining each path of parallel data, the receiving device performs digital mixing on each path of parallel data to realize frequency spectrum shifting of each path of parallel data, and shifts each path of parallel data from the corresponding sub-band to the baseband to obtain each path of parallel data after digital mixing.
S402, down-sampling each path of parallel data after digital mixing;
specifically, the receiving apparatus down-samples each of the digitally mixed parallel data channels to lower a sampling frequency of each of the down-sampled parallel data channels to a sampling frequency of a baseband.
S403, performing low-pass filtering on each path of parallel data after down-sampling;
specifically, the receiving apparatus performs low-pass filtering on each of the down-sampled parallel data by using a filter, and can select desired spectrum data. The low-pass filtering can improve the anti-interference capability of the receiving end. The filter is set according to actual needs, and the embodiment of the invention is not limited.
S404, demodulating each path of parallel data after low-pass filtering to obtain demodulation data corresponding to each path of parallel data;
specifically, after low-pass filtering, the receiving apparatus demodulates each path of parallel data after low-pass filtering, and may obtain demodulated data corresponding to each path of parallel data.
Fig. 5 is a schematic structural diagram of a transmitting apparatus according to an embodiment of the present invention, and as shown in fig. 5, the transmitting apparatus according to the present invention includes a converting unit 501, a first processing unit 502, a combining unit 503, and a transmitting unit 504, where:
the conversion unit 501 is configured to perform serial-to-parallel conversion on the bit stream data according to the carrying capacity of each sub-band to obtain multiple paths of parallel data, where each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; the first processing unit 502 is configured to process the parallel data corresponding to each sub-band according to a first processing rule, so as to obtain a digitally-mixed signal of each sub-band; wherein the first processing rule is preset; the synthesis unit 503 is configured to synthesize the digitally mixed signals of each sub-band to obtain a baseband signal; the transmitting unit 504 is configured to perform carrier modulation on the baseband signal, and transmit the carrier-modulated baseband signal from an air interface to a receiving apparatus.
Specifically, the discrete subband data transmission method based on orthogonal frequency division multiplexing according to the embodiment of the present invention performs communication transmission by using an orthogonal frequency division multiplexing technique, performs data transmission on bit stream data to be subjected to communication transmission by using a discrete narrowband, divides each discrete narrowband into a plurality of subbands, and forms a discrete subband with the subbands included in each discrete narrowband. The conversion unit 501 performs serial-to-parallel conversion according to the carrying capacity of each sub-band, and converts serial bit stream data into N parallel data, where each parallel data corresponds to one sub-band. The carrying capacity of the sub-band depends on the number of sub-carriers included in the sub-band, and the more the number of sub-carriers included in the sub-band is, the more parallel data can be transmitted. The sub-bands are preset, and the bandwidth of each sub-band is 25 KHz. It is understood that N is a positive integer and N is greater than or equal to 2. The number of subcarriers included in the subband is set according to actual needs, and the embodiment of the present invention is not limited.
After obtaining N paths of parallel data, first processing unit 502 processes the parallel data corresponding to each sub-band according to a first processing rule, so as to obtain a digitally mixed signal of each sub-band. Wherein the first processing rule is preset.
After obtaining the digitally mixed signals of each of the subbands, synthesizing section 503 synthesizes the digitally mixed signals of each of the subbands to obtain a baseband signal. Parallel transmission of a plurality of said sub-bands can be achieved by means of the above-mentioned baseband signal. The specific method for synthesizing the digitally mixed signals of each subband is the prior art, and is not described herein again.
After obtaining the baseband signal, the transmitting unit 504 carrier-modulates the baseband signal, and then transmits the carrier-modulated baseband signal from the air interface to the receiving apparatus. The specific process of the carrier modulation of the baseband signal is the prior art, and is not described herein again.
The transmitting device provided by the invention can perform serial-parallel conversion on input bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, each path of parallel data corresponds to one sub-band, then the parallel data corresponding to each sub-band is processed according to a first processing rule to obtain a digital mixing signal of each sub-band, then the digital mixing signals of each sub-band are synthesized to obtain a baseband signal, then the baseband signal is subjected to carrier modulation, and the baseband signal subjected to carrier modulation is transmitted from an air interface, so that the parallel communication of a plurality of discrete sub-bands is realized, and the communication efficiency of the discrete sub-bands is improved.
The embodiment of the sending apparatus provided by the present invention may be specifically configured to execute the processing flow of the corresponding method embodiment, and the functions of the sending apparatus are not described herein again, and refer to the detailed description of the corresponding method embodiment.
Fig. 6 is a schematic structural diagram of a receiving apparatus according to an embodiment of the present invention, and as shown in fig. 6, the receiving apparatus according to the embodiment of the present invention includes a receiving unit 601, a second processing unit 602, and an output unit 603, where:
the receiving unit 601 is configured to receive data from an air interface, and divide the received data into N parallel data, where each parallel data corresponds to one subband; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; the second processing unit 602 is configured to process each path of parallel data according to a second processing rule, and obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset; the output unit 603 is configured to perform parallel-to-serial conversion on the demodulated data corresponding to each channel of parallel data, and output bitstream data.
Specifically, the receiving unit 601 receives data from an air interface, and then divides the received data into N parallel data according to the central frequency point and the bandwidth of each sub-band, where each parallel data corresponds to one sub-band. Wherein the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz. It is understood that N is a positive integer and N is greater than or equal to 2.
After obtaining each of the parallel data, the second processing unit 602 processes each path of parallel data according to the second processing rule, and may obtain demodulated data corresponding to each path of parallel data. Wherein the second processing rule is preset.
After obtaining the demodulated data corresponding to each of the parallel data channels, the output unit 603 performs parallel-to-serial conversion on the demodulated data corresponding to each of the parallel data channels, so that the demodulated data corresponding to each of the parallel data channels is converted into bit stream data and output.
The receiving device provided by the embodiment of the invention can receive data from an air interface, divide the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band, process each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data, and perform parallel-serial conversion on the demodulation data corresponding to each path of parallel data to output bit stream data, thereby realizing parallel communication of a plurality of discrete sub-bands and improving the communication efficiency of the discrete sub-bands.
The embodiment of the receiving apparatus provided in the present invention may be specifically configured to execute the processing procedure of the corresponding method embodiment, and the functions of the embodiment are not described herein again, and refer to the detailed description of the corresponding method embodiment.
Fig. 7 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 7, the electronic device may include: a first Processor (Processor)710, a first communication Interface (Communications Interface)720, a first Memory (Memory)730 and a first communication bus 740, wherein the first Processor 710, the first communication Interface 720 and the first Memory 730 complete communication with each other through the first communication bus 740. The first processor 710 may call logic instructions in the first memory 730 to perform a method, for example, comprising: performing serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset; synthesizing the digitally mixed signals of each sub-band to obtain baseband signals; and carrying out carrier modulation on the baseband signal, and sending the baseband signal subjected to the carrier modulation to a receiving device from an air interface.
The present embodiments disclose a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, the computer is capable of performing a method, for example comprising: performing serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset; synthesizing the digitally mixed signals of each sub-band to obtain baseband signals; and carrying out carrier modulation on the baseband signal, and sending the baseband signal subjected to the carrier modulation to a receiving device from an air interface.
The present embodiments provide a non-transitory computer readable storage medium storing first computer instructions that cause a computer to perform a method, for example, comprising: performing serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset; synthesizing the digitally mixed signals of each sub-band to obtain baseband signals; and carrying out carrier modulation on the baseband signal, and sending the baseband signal subjected to the carrier modulation to a receiving device from an air interface.
Fig. 8 is a schematic entity structure diagram of an electronic device according to another embodiment of the present invention, and as shown in fig. 8, the electronic device may include: a second Processor (Processor)810, a second communication Interface (Communications Interface)820, a second Memory (Memory)830 and a second communication bus 840, wherein the second Processor 810, the second communication Interface 820 and the second Memory 830 complete communication with each other through the second communication bus 840. The second processor 810 may call logic instructions in the second memory 830 to perform methods including, for example: receiving data from an air interface, and dividing the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset; and performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data, and outputting bit stream data.
The present embodiments disclose a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, the computer is capable of performing a method, for example comprising: receiving data from an air interface, and dividing the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset; and performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data, and outputting bit stream data.
The present embodiments provide a non-transitory computer readable storage medium storing second computer instructions that cause the computer to perform a method, for example, comprising: receiving data from an air interface, and dividing the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz; processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset; and performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data, and outputting bit stream data.
In addition, the logic instructions in the first storage 730 and the second storage 830 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer (which may be a personal computer, an apparatus, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes. The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. A method for transmitting discrete sub-band data based on orthogonal frequency division multiplexing, comprising:
performing serial-parallel conversion on bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset;
synthesizing the digitally mixed signals of each sub-band to obtain baseband signals;
and carrying out carrier modulation on the baseband signal, and sending the baseband signal subjected to the carrier modulation to a receiving device from an air interface.
2. The method of claim 1, wherein the first processing rule comprises:
modulating the parallel data corresponding to the sub-band;
low-pass filtering the modulated data;
up-sampling the low-pass filtered data at a preset sampling frequency;
and carrying out digital mixing on the up-sampled data to obtain a digital mixed signal.
3. The method of claim 1, wherein the effective bandwidth of the sub-band is 22kHz or 22.5 kHz.
4. The method of claim 1, wherein the sub-band comprises 6, 8, 9, 10, 12, 15, 18, or 20 sub-carriers when the effective bandwidth of the sub-band is 22.5 kHz; when the effective bandwidth of the sub-band is 22kHz, the number of sub-carriers included in the sub-band is 11 or 22.
5. A method for transmitting discrete sub-band data based on orthogonal frequency division multiplexing, comprising:
receiving data from an air interface, and dividing the received data into N paths of parallel data, wherein each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset;
and performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data, and outputting bit stream data.
6. The method of claim 1, wherein the second processing rule comprises:
performing digital mixing on each path of parallel data;
performing downsampling on each path of parallel data after digital frequency mixing;
performing low-pass filtering on each path of parallel data after down sampling;
and demodulating each path of parallel data after low-pass filtering to obtain demodulation data corresponding to each path of parallel data.
7. A transmitting apparatus, comprising:
the conversion unit is used for carrying out serial-parallel conversion on the bit stream data according to the bearing capacity of each sub-band to obtain multiple paths of parallel data, and each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
the first processing unit is used for processing the parallel data corresponding to each sub-band according to a first processing rule to obtain a digital mixed signal of each sub-band; wherein the first processing rule is preset;
a synthesis unit, configured to synthesize the digitally-mixed signals of each sub-band to obtain a baseband signal;
and the transmitting unit is used for carrying out carrier modulation on the baseband signal and transmitting the baseband signal subjected to the carrier modulation to the receiving device from an air interface.
8. A receiving apparatus, comprising:
a receiving unit, configured to receive data from an air interface, and divide the received data into N paths of parallel data, where each path of parallel data corresponds to one sub-band; the sub-bands are preset, and the bandwidth of each sub-band is 25 kHz;
the second processing unit is used for processing each path of parallel data according to a second processing rule to obtain demodulation data corresponding to each path of parallel data; wherein the second processing rule is preset;
and the output unit is used for performing parallel-serial conversion on the demodulation data corresponding to each path of parallel data and outputting bit stream data.
9. An electronic device comprising a first memory, a first processor and a first computer program stored on the memory and executable on the processor, characterized in that the first processor, when executing the program, implements the steps of the method for orthogonal frequency division multiplexing based discrete sub-band data transmission according to any of claims 1 to 4.
10. A non-transitory computer readable storage medium having stored thereon a first computer program, wherein the first computer program, when executed by a first processor, implements the steps of the method for orthogonal frequency division multiplexing based discrete subband data transmission according to any one of claims 1 to 4.
11. An electronic device comprising a second memory, a second processor and a second computer program stored on the memory and executable on the processor, characterized in that the second processor, when executing the second computer program, implements the steps of the method for orthogonal frequency division multiplexing based discrete sub-band data transmission according to claim 5 or 6.
12. A non-transitory computer readable storage medium having stored thereon a second computer program, which when executed by a second processor implements the steps of the orthogonal frequency division multiplexing based discrete subband data transmitting method according to claim 5 or 6.
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