CN106534026B - Data sequence processing method and related equipment - Google Patents
Data sequence processing method and related equipment Download PDFInfo
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- CN106534026B CN106534026B CN201610900649.8A CN201610900649A CN106534026B CN 106534026 B CN106534026 B CN 106534026B CN 201610900649 A CN201610900649 A CN 201610900649A CN 106534026 B CN106534026 B CN 106534026B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
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- H—ELECTRICITY
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- 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
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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Abstract
The embodiment of the invention relates to the technical field of mobile communication, and discloses a data sequence processing method and related equipment, wherein the method comprises the following steps: receiving an input binary data sequence; and processing the binary data sequence by adopting a parameter set to generate a baseband signal, and setting the working frequency band 2.4GHz ISM frequency band and the working bandwidth 10MHz of the baseband signal, wherein the parameter set comprises a subcarrier number 52, the subcarrier number 52 comprises 48 data subcarriers and 4 pilot subcarriers, the symbol time is 8us, and the protection interval is 1.6 us. By implementing the embodiment of the invention, the packet loss rate of the data packet in the mobile communication transmission process can be reduced.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a data sequence processing method and related devices.
Background
Data is transmitted in units of data packets over a communication network. When a data packet may be lost due to a physical line fault, an equipment fault, routing information, or a small delay tolerance at a receiving end in a transmission process of a communication network, people usually use a packet loss rate, i.e., a ratio of the data packet lost in the communication network to the data packet sent in the communication network, to indicate a loss condition of the data packet in the communication network.
In a mobile communication environment, a delay problem occurs due to multipath or doppler effect and other factors when a data packet is transmitted, and when the transmission delay of the data packet is greater than the instant delay tolerance limit of a receiving end to the delay, the packet loss rate of the data packet is greater.
Disclosure of Invention
The embodiment of the invention discloses a data sequence processing method and related equipment, which can reduce the packet loss rate of a data packet in the mobile communication transmission process.
The first aspect of the embodiments of the present invention discloses a data sequence processing method, including:
receiving an input binary data sequence;
and processing the binary data sequence by adopting a parameter set to generate a baseband signal, and setting the working frequency band 2.4GHz ISM frequency band and the working bandwidth 10MHz of the baseband signal, wherein the parameter set comprises a subcarrier number 52, the subcarrier number 52 comprises 48 data subcarriers and 4 pilot subcarriers, the symbol time is 8us, and the guard interval is 1.6 us.
A second aspect of the embodiments of the present invention discloses a mobile terminal, including:
a data sequence receiving unit for receiving an input binary data sequence;
and the data sequence processing unit is used for processing the binary data sequence received by the data sequence receiving unit by adopting a parameter set to generate a baseband signal, and setting the working frequency band 2.4GHz ISM frequency band and the working bandwidth 10MHz of the baseband signal, wherein the parameter set comprises a subcarrier number 52, the subcarrier number 52 comprises 48 data subcarriers and 4 pilot subcarriers, the symbol time is 8us, and the guard interval is 1.6 us.
In the embodiment of the invention, the mobile terminal adopts the parameter set to process the received binary data sequence so as to generate the baseband signal. By implementing the embodiment of the invention, the maximum time delay tolerance allowed by the communication system can be increased by processing the binary data sequence by adopting the parameter set, so that the packet loss rate of the binary data sequence in the transmission process of the communication system is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart illustrating a data sequence processing method according to an embodiment of the present invention;
fig. 1(a) is a schematic diagram of an OFDM modulation principle disclosed in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a mobile terminal disclosed in the embodiment of the present invention;
fig. 3 is a computer system based on von neumann architecture for executing the above application interface switching method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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.
It is to be understood that the terminology used in the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The embodiment of the invention discloses a data sequence processing method and related equipment, which can reduce the packet loss rate of a data packet in the mobile communication transmission process. The following are detailed below.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a data sequence processing method according to an embodiment of the present invention. As shown in fig. 1, the data sequence processing method may include the following steps.
S101, the mobile terminal receives an input binary data sequence.
And S102, the mobile terminal processes the binary data sequence by adopting a parameter set to generate a baseband signal, and sets the working frequency band 2.4GHz ISM frequency band and the working bandwidth 10MHz of the baseband signal, wherein the parameter set comprises a subcarrier number 52, the subcarrier number 52 comprises 48 data subcarriers and 4 pilot subcarriers, the symbol time is 8us, and the guard interval is 1.6 us.
The mobile terminal may include a user equipment running an Android operating system, an iOS operating system, a Windows operating system, or other operating systems, for example, a mobile phone, a mobile computer, a tablet computer, a drone, or other devices with communication functions.
The mobile terminal can acquire the binary data sequence through data acquisition equipment such as a microphone and the like, and then carry out serial-to-parallel conversion on the binary data sequence, so that the serial binary data sequence is converted into N parallel data, the N parallel data are multiplied by N data subcarriers and then distributed to N different subchannels, and N paths of data are coded and mapped into N composite sub-symbols. Referring to the modulation principle shown in fig. 1(a), the 48 data subcarriers may be { sinw } respectively0t,sin2w0t,……，sin48w0t, 48 and 48 parallel data { a } for the data sub-carrier, respectively1,a2,……，a48Multiply.
The mobile terminal may further perform coding mapping on the data obtained by multiplying the N parallel data by the N data subcarriers, where an embodiment of the present invention may encode the data by using a cyclic convolutional coding technique with K being 7, so as to generate N complex subsymbols. The mobile terminal may also send the N complex sub-symbols to an Inverse Fast Fourier Transform (IFFT) module for transforming the N complex sub-symbols in the frequency domain into 2N real samples.
The mobile terminal may also add a cyclic prefix to the 2N real samples to form a cyclic extended information codeword, which is subjected to parallel-to-serial conversion, digital-to-analog conversion D/a, and a low pass filter to output the baseband signal.
In this embodiment, a symbol time of 8us may also be introduced, i.e. the time for transmitting data may be 8us, and the guard interval time may be 1.6 us. Compared with the 802.11a 20MHz bandwidth of WIreless Fidelity (wifi), the time for transmitting the same amount of data is doubled, for example, the same amount of data, the original 802.11a of wifi uses 4us to modulate the signal and can now use 8us to modulate the signal, the time for this modulation is from 6.4us of Fast Fourier Transform (FFT) operation + 1.6us of guard interval time, although the time for the symbol is lengthened, the purpose is to increase the time for the guard interval, the original 802.11a symbol time of wifi is 4us, and the guard interval is 0.8 us.
Why is there a guard interval? When the signal is transmitted, reflection (referring to visible light) occurs when the signal meets surrounding objects, the time of the signal subjected to multiple reflection and the time of the signal not subjected to reflection have delay, for example, at a distance of 300m, the signal subjected to 5 times of radiation has delay of about 5us than the signal not subjected to reflection, so that at the same time, besides receiving a direct signal sent under an ideal environment without reflection, another signal sent before 5us after multiple reflection is received, and the two signals cause interference. In order to avoid the phenomenon, the definition of the guard interval time is introduced, after the FFT operation (regarded as the data transmission), the guard interval time is waited, and then the FFT operation is carried out, so as to prevent the data which is transmitted before from being interfered by multiple reflections and is transmitted at the next time without being reflected.
Optionally, after the mobile terminal processes the binary data sequence by using the parameter set to generate a baseband signal, the mobile terminal may further encrypt and pack the baseband signal, and perform up-conversion on the encrypted and packed baseband signal to output an Orthogonal Frequency Division Multiplexing (OFDM) signal. In this embodiment, the baseband signal may be encrypted by using an Encryption algorithm such as a symmetric Encryption algorithm DES (Data Encryption Standard), a 3DES (Triple DES), and an International Data Encryption Algorithm (IDEA).
Optionally, the mobile terminal may further perform frequency up-conversion on the encrypted and packaged baseband signal by using one or more of Binary Phase Shift Keying (BPSK) technology, Quadrature Phase Shift Keying (QPSK) technology, Quadrature Amplitude Modulation (16 QAM) technology, and Quadrature Amplitude Modulation (64 QAM) technology, so as to output an OFDM signal.
Optionally, after the mobile terminal outputs the OFDM signal through frequency up-conversion, the mobile terminal may further amplify the power of the OFDM signal.
Optionally, the parameter set further includes a Physical Layer Convergence Protocol (PLCP) preamble time 32 us. The PLCP includes two long training sequences and two end training sequences, and is used to perform signal detection, automatic gain control, diversity reception, coarse frequency estimation, time synchronization, and the like. PLCP preamble time 32us may refer to 32us of time to transmit a PLCP preamble, which is doubled over wifi's 802.11a standard, primarily due to increased guard time in the preamble and increased FFT computation time.
Wherein the pilot subcarriers may be used for channel estimation.
In this embodiment, Carrier Sense Multiple access with Collision Detection (CSMA/CD) may not be performed on the channel.
It should be noted that N referred to in this embodiment may be the number 48 of the data subcarriers.
The beneficial effects of the embodiment can be analyzed by using a mathematical formula:
let the transmission rate of data be RbAnd the number of modulation states per data subcarrier is M (M-ary), the information content of one FFT symbol is log2M, duration T:
frequency spacing of data subcarriers:
bandwidth of an OFDM signal:
thereby obtaining the frequency band utilization ratio:
defining tau as the maximum time delay allowed by the communication system, the coherence bandwidth of the system is:
when the signal bandwidth is greater than the coherence bandwidth of the channel, the channel is called a frequency selective channel. Frequency selective fading distortion can cause transmission errors. The maximum delay allowed by the system is:
for example, if the transmission rate R of the data isbWhen the data is in the QPSK modulation technique and the modulation state number M corresponding to the QPSK modulation technique is 4, the maximum time delay of the communication system substituted into the above equation is 16.67 us.
In the method depicted in fig. 1, the mobile terminal processes the received binary data sequence with a set of parameters to generate a baseband signal. The symbol time of the scheme is 8us compared with the symbol time of 4us of 802.11a, i.e. data is transmitted in 8 us. Transmission rate of data R compared to 802.11abAnd decreases. It can be seen from the above maximum delay formula allowed by the system that the data transmission rate R is constant under the condition of the modulation state number MbDecreasing, the maximum delay τ allowed by the system becomes larger. It can be seen that, by implementing the method described in fig. 1, the maximum allowable delay tolerance of the communication system can be increased by processing the binary data sequence with the parameter set, so as to reduce the packet loss rate of the binary data sequence during the transmission process of the communication system.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention. The mobile terminal shown in fig. 2 may include:
a data sequence receiving unit 201, configured to receive an input binary data sequence.
A data sequence processing unit 202, configured to process the binary data sequence received by the data sequence receiving unit 201 by using a parameter set to generate a baseband signal, and set an operating frequency band of the baseband signal to be a 2.4GHz ISM frequency band and an operating bandwidth to be 10MHz, where the parameter set includes a subcarrier number 52, the subcarrier number 52 includes 48 data subcarriers and 4 pilot subcarriers, a symbol time is 8us, and a guard interval is 1.6 us.
The mobile terminal can acquire the binary data sequence through data acquisition equipment such as a microphone and the like, and then carry out serial-to-parallel conversion on the binary data sequence, so that the serial binary data sequence is converted into N parallel data, the N parallel data are multiplied by N data subcarriers and then distributed to N different subchannels, and N paths of data are coded and mapped into N composite sub-symbols. Referring to the modulation principle shown in fig. 1(a), the 48 data subcarriers may be { sinw } respectively0t,sin2w0t,……，sin48w0t, 48 and 48 parallel data { a } for the data sub-carrier, respectively1,a2,……，a48Multiply.
The mobile terminal may further perform coding mapping on the data obtained by multiplying the N parallel data by the N data subcarriers, where an embodiment of the present invention may encode the data by using a cyclic convolutional coding technique with K being 7, so as to generate N complex subsymbols. The mobile terminal may also feed the N complex sub-symbols to an IFFT module that converts the N complex sub-symbols in the frequency domain into 2N real samples.
The mobile terminal may also add a cyclic prefix to the 2N real samples to form a cyclic extended information codeword, which is subjected to parallel-to-serial conversion, digital-to-analog conversion D/a, and a low pass filter to output the baseband signal.
In this embodiment, a symbol time of 8us may also be introduced, i.e. the time for transmitting data may be 8us, and the guard interval time may be 1.6 us. Compared with wifi 802.11a 20MHz bandwidth, the time for transmitting the same data amount is doubled, for example, the same data amount, originally wifi 802.11a modulates signal transmission with 4us, now can modulate transmission with 8us time, the modulated time is from FFT time 6.4us + guard interval time 1.6us, although the symbol time is lengthened, the purpose is to increase the guard interval time, originally wifi 802.11a symbol time is 4us, and the guard interval is 0.8 us.
Optionally, the data sequence processing unit 202 is further configured to encrypt and pack the baseband signal after the binary data sequence is processed by the parameter set to generate the baseband signal, and perform up-conversion on the encrypted and packed baseband signal to output an orthogonal frequency division multiplexing OFDM signal.
Optionally, the data sequence processing unit 202, when performing the step of outputting the OFDM signal by performing up-conversion on the encrypted and packaged baseband signal, is specifically configured to perform up-conversion on the encrypted and packaged baseband signal by using one or more of a Binary Phase Shift Keying (BPSK) technique, a Quadrature Phase Shift Keying (QPSK) technique, a quadrature amplitude modulation (16 QAM) technique, and a quadrature amplitude modulation (64 QAM) technique, so as to output the OFDM signal.
In this embodiment, the baseband signal may be encrypted by using encryption algorithms such as a symmetric encryption algorithm DES, a 3DES, and an international data encryption algorithm IDEA.
Optionally, the data sequence processing unit 202 is further configured to amplify the power of the OFDM signal after the OFDM signal is up-converted and output.
Optionally, the parameter set further includes cyclic convolutional coding of physical layer convergence protocol PLCP preamble time 32us and K-7.
The PLCP includes two long training sequences and two end training sequences, and is used to perform signal detection, automatic gain control, diversity reception, coarse frequency estimation, time synchronization, and the like. PLCP preamble time 32us may refer to 32us of time to transmit a PLCP preamble, which is doubled over wifi's 802.11a standard, primarily due to increased guard time in the preamble and increased FFT computation time.
Wherein the pilot subcarriers may be used for channel estimation.
In this embodiment, CSMA/CD may not be performed on the channel.
It should be noted that N referred to in this embodiment may be the number 48 of the data subcarriers.
It can be seen that, by implementing the mobile terminal described in fig. 2, the packet loss rate of the binary data sequence in the transmission process of the communication system can be reduced.
Fig. 3 shows a computer system 3 based on the von neumann architecture running the above-described application interface switching method. The computer system 3 may be a user terminal device such as a smart phone, a tablet computer, a palm computer, a notebook computer or a personal computer. Specifically, an external input interface 1001, a processor 1002, a memory 1003, and an output interface 1004 connected through a system bus may be included. The external input interface 1001 may include a touch screen 10016, and optionally a network interface 10018. Memory 1003 can include external memory 10032 (e.g., a hard disk, optical or floppy disk, etc.) and internal memory 10034. Output interfaces 1004 may include devices such as a display 10042 and speakers 10044.
In the present embodiment, the method is executed based on a computer program, the program file of the computer program is stored in the external memory 10032 of the computer system 10 based on the von neumann system, and is loaded into the internal memory 10034 during the execution, and then is compiled into machine code and then is transmitted to the processor 1002 for execution, so that the operation monitoring module 310, the fingerprint detection module 320, the interface switching module 330, the pressure value judging module 340, the first step size determining module 350 and the second step size determining module 360 which are logically formed in the computer system 10 based on the von neumann system are all received through the external input interface 1001 during the execution of the application interface switching method, and are transmitted to the memory 1003 for buffering, and then are input to the processor 1002 for processing, and the result data of the processing is buffered in the memory 1003 for subsequent processing, or passed to the output interface 1004 for output.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The units in the mobile terminal of the embodiment of the invention can be merged, divided and deleted according to actual needs.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by instructions associated with a program, which may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), compact disc-Read-Only Memory (CD-ROM), or other Memory, magnetic disk, magnetic tape, or magnetic tape, Or any other medium which can be used to carry or store data and which can be read by a computer.
The foregoing describes a data sequence processing method and related devices disclosed in the embodiments of the present invention in detail, and specific examples are applied herein to explain the principles and embodiments of the present invention, and the description of the foregoing embodiments is only used to help understand the method and its core ideas of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in view of the above, the content of the present specification should not be construed as a limitation to the present invention.
Claims (2)
1. A method for processing a data sequence, the method comprising:
receiving an input binary data sequence;
performing serial-to-parallel conversion on the binary data sequence to convert the binary data sequence into N parallel data;
coding and mapping the data obtained by multiplying the N parallel data by the N data subcarriers to generate N complex subsymbols;
performing inverse fast Fourier transform on the N complex subsymbols to obtain 2N real number samples;
adding a cyclic prefix to the 2N real number samples to obtain a cyclic extended information codeword;
sequentially performing parallel-to-serial conversion, digital-to-analog conversion D/A and low-pass filtering on the cyclically extended information code word to obtain a baseband signal;
the method comprises the steps of performing up-conversion on an encrypted and packaged baseband signal by adopting one or more of binary phase shift keying technology BPSK, quadrature phase shift keying technology QPSK, quadrature amplitude modulation technology 16QAM and quadrature amplitude modulation technology 64QAM so as to output an Orthogonal Frequency Division Multiplexing (OFDM) signal, amplifying the power of the OFDM signal, and setting the working frequency band 2.4GHz ISM frequency band and the working bandwidth 10MHz of the baseband signal, wherein a parameter set comprises a subcarrier number 52, the subcarrier number 52 comprises 48 data subcarriers and 4 pilot subcarriers, the symbol time is 8us, and the protection interval is 1.6 us; the set of parameters also includes cyclic convolutional encoding of physical layer convergence protocol PLCP preamble time 32us and K7.
2. A mobile terminal, characterized in that the mobile terminal comprises:
a data sequence receiving unit for receiving an input binary data sequence;
the data sequence processing unit is used for carrying out serial-parallel conversion on the binary data sequence so as to convert the binary data sequence into N parallel data;
and coding and mapping the data obtained by multiplying the N parallel data by the N data subcarriers to generate N complex subsymbols;
performing inverse fast Fourier transform on the N complex subsymbols to obtain 2N real number samples;
adding a cyclic prefix to the 2N real number samples to obtain a cyclic extended information codeword;
and sequentially performing parallel-to-serial conversion, digital-to-analog conversion D/A and low-pass filtering on the cyclically extended information code word to obtain a baseband signal;
the encrypted and packaged baseband signals are subjected to up-conversion by adopting one or more of a Binary Phase Shift Keying (BPSK) technology, a Quadrature Phase Shift Keying (QPSK) technology, a quadrature amplitude modulation (16 QAM) technology and a quadrature amplitude modulation (64 QAM) technology so as to output Orthogonal Frequency Division Multiplexing (OFDM) signals, the power of the OFDM signals is amplified, the working frequency band 2.4GHz ISM frequency band and the working bandwidth 10MHz of the baseband signals are set, a parameter set comprises a subcarrier number 52, the subcarrier number 52 comprises 48 data subcarriers and 4 pilot subcarriers, the symbol time is 8us, and the protection interval is 1.6 us; the set of parameters also includes cyclic convolutional encoding of physical layer convergence protocol PLCP preamble time 32us and K7.
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