CN116232821A - Ad hoc network physical layer frame structure and wireless communication method - Google Patents

Ad hoc network physical layer frame structure and wireless communication method Download PDF

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Publication number
CN116232821A
CN116232821A CN202211526601.7A CN202211526601A CN116232821A CN 116232821 A CN116232821 A CN 116232821A CN 202211526601 A CN202211526601 A CN 202211526601A CN 116232821 A CN116232821 A CN 116232821A
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target data
physical layer
data frame
frame structure
layer frame
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代健美
李金城
唐晓刚
刘力天
高丽娟
李长青
李炯
陈龙
于凤坤
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Peoples Liberation Army Strategic Support Force Aerospace Engineering University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/2659—Coarse or integer frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/266—Fine or fractional frequency offset determination and synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention provides a wireless communication method and a device based on a predetermined physical layer frame structure, wherein the method comprises the following steps: the transmitting terminal groups frames according to a preset physical layer frame structure based on the information to be transmitted, and combines data scrambling, channel interleaving and modulation processing to generate a target data frame; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure includes a preamble part including a PB0 part and a PB1 part; receiving the target data frame by a receiving end, and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame; based on PB0 part, the receiving end estimates the frequency offset of the target data frame and corrects the frequency offset; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be transmitted is obtained by combining demodulation and decoding processing. The invention can reduce the transmission delay of the self-networking equipment and the sensitivity of the system to Doppler shift by the design of the physical layer frame structure.

Description

Ad hoc network physical layer frame structure and wireless communication method
Technical Field
The present invention relates to the field of computer technologies, and in particular, to an ad hoc network physical layer frame structure and a wireless communication method.
Background
Ad hoc networks are a networking modality that differs from the common cellular networks. The method has the characteristic of decentralization, and can self-network without configuration or with few devices except communication nodes, thereby realizing multi-hop communication between any two points in the network.
The frame structure of the current ad hoc network physical layer mainly has two main types: firstly, a physical layer frame structure based on a CSMA protocol, wherein the frame structure generally needs to consider retransmission caused by collision, and a frame field contains retransmission feedback and other contents; and secondly, the physical layer frame structure based on the TDMA protocol does not need to consider conflict, generally, a wireless frame is divided into a plurality of time slots, the time slots are adopted as scheduling objects, and the frame field contains contents such as synchronization, verification and the like.
At present, a physical layer frame structure adopting a CSMA ad hoc network protocol can have collision and collision, and when the number of nodes is large, the transmission efficiency is low. The physical layer frame structure adopting the TDMA ad hoc network protocol has the problems of complicated networking process, overlong consumed time, serious Doppler shift and the like, and influences the construction speed, network performance and the like of the ad hoc network.
Disclosure of Invention
The invention provides an ad hoc network physical layer frame structure and a wireless communication method, which are used for solving the defects of low ad hoc network transmission efficiency and serious Doppler frequency shift in the prior art, and realizing high-precision frequency offset estimation and quick synchronization of single carrier frequency domain equalization by optimizing the physical layer frame structure, particularly a preamble part, so that the ad hoc network equipment reduces the transmission delay and reduces the sensitivity of the system to the Doppler frequency shift.
The invention provides a wireless communication method based on a predetermined physical layer frame structure, which comprises the following steps:
the transmitting terminal groups frames according to a preset physical layer frame structure based on the information to be transmitted, and combines data scrambling, channel interleaving and modulation processing to generate a target data frame; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure comprises a preamble part, wherein the preamble part comprises a PB0 part and a PB1 part, and is used for completing synchronization and frequency offset correction;
receiving the target data frame by a receiving end, and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame;
estimating and correcting the frequency offset of the target data frame by a receiving end based on the PB0 part; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing.
According to the wireless communication method based on the predetermined physical layer frame structure, the PB0 part comprises a UW sequence and a modulation sequence, and is used for completing frequency offset correction; the PB1 part comprises a cyclic prefix CP sequence, a unique code UW-L sequence and a cyclic suffix CP sequence, which are used for completing synchronization.
According to the wireless communication method based on the predetermined physical layer frame structure provided by the invention, the UW sequences comprise 20 UW sequences, the modulation sequences comprise 16 modulation symbols, wherein,
the first 16 UW sequences in the 20 UW sequences are used for frame arrival detection PD and coarse frequency synchronization CFE, and the last 4 UW sequences in the 20 UW sequences are used for frame coarse timing synchronization CTE;
the first 3 symbols of the 16 modulation symbols are null symbols; the last 13 symbols of the 16 modulation symbols are BAKER sequences, and are used for realizing fine timing synchronization FTE.
According to the wireless communication method based on the predetermined physical layer frame structure, the UW sequences in the PB0 part comprise 20 UW sequences, wherein the first 16 UW sequences in the 20 UW sequences are long UW words, and the last 4 UW sequences in the 20 UW sequences are short UW words;
in a corresponding manner,
the estimating and correcting the frequency offset of the target data frame based on the PB0 part comprises the following steps:
based on the PB0 part, firstly, performing coarse frequency offset estimation by using a short UW word, then performing fine frequency offset estimation by using a long UW word, and correcting the frequency offset of the target data frame based on an estimation result.
According to the wireless communication method based on the predetermined physical layer frame structure provided by the invention, the fast synchronization of the target data frame is completed based on the PB1 part, and the method comprises the following steps:
based on the PB1 part, combining time-frequency synchronization algorithms Schmid1 and Cox to complete the rapid synchronization of the target data frame.
According to the wireless communication method based on the preset physical layer frame structure, the channel interleaving comprises two-stage interleaving, intra-block interleaving and sub-frame interleaving.
According to the wireless communication method based on the predetermined physical layer frame structure, the modulation processing comprises quadrature phase shift keying QPSK and 16 quadrature amplitude modulation 16QAM.
The invention also provides a wireless communication device based on the predetermined physical layer frame structure, which comprises:
the transmitting module is used for framing according to a preset physical layer frame structure by a transmitting end based on information to be transmitted, and generating a target data frame by combining data scrambling, channel interleaving and modulation processing; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure includes a preamble part including a PB0 part and a PB1 part;
the receiving and analyzing module is used for receiving the target data frame by a receiving end and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame;
the estimating output module is used for estimating the frequency offset of the target data frame and correcting the frequency offset based on the PB0 part by a receiving end; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor implements the wireless communication method based on the predetermined physical layer frame structure according to any one of the above when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a wireless communication method based on a predetermined physical layer frame structure as described in any of the above.
The invention provides a wireless communication method, a device, an electronic device and a storage medium based on a predetermined physical layer frame structure, wherein a transmitting end performs framing according to the predetermined physical layer frame structure based on information to be transmitted, and combines data scrambling, channel interleaving and modulation processing to generate a target data frame; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure comprises a preamble part, wherein the preamble part comprises a PB0 part and a PB1 part, and is used for completing synchronization and frequency offset correction; receiving the target data frame by a receiving end, and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame; estimating and correcting the frequency offset of the target data frame by a receiving end based on the PB0 part; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing. The invention realizes high-precision frequency offset estimation and quick synchronization of single carrier frequency domain equalization by optimizing the physical layer frame structure, especially the preamble part, so that the transmission delay of the self-networking equipment is reduced, and the sensitivity of the system to Doppler frequency shift is reduced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a wireless communication method based on a predetermined physical layer frame structure according to the present invention;
fig. 2 is a schematic structural diagram of a predetermined physical layer frame structure provided in the present invention;
fig. 3 is a schematic structural diagram of a wireless communication device based on a predetermined physical layer frame structure according to the present invention;
fig. 4 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes a wireless communication method, apparatus, electronic device and storage medium based on a predetermined physical layer frame structure according to the present invention with reference to fig. 1 to 4.
Fig. 1 is a flow chart of a wireless communication method based on a predetermined physical layer frame structure provided by the present invention, and fig. 2 is a structural diagram of a predetermined physical layer frame structure provided by the present invention, as shown in fig. 1 and fig. 2, in a specific embodiment, the present invention provides a wireless communication method based on a predetermined physical layer frame structure, including:
step S110, framing is carried out by a transmitting end based on the information to be transmitted according to a preset physical layer frame structure, and a target data frame is generated by combining data scrambling, channel interleaving and modulation processing; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure includes a preamble part including a PB0 part and a PB1 part;
step S120, a receiving end receives the target data frame and analyzes the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame;
step S130, based on the PB0 part, estimating and correcting the frequency offset of the target data frame by a receiving end; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing.
Further, the PB0 part comprises a UW sequence and a modulation sequence, and is used for completing frequency offset correction; the PB1 part comprises a cyclic prefix CP sequence, a unique code UW-L sequence and a cyclic suffix CP sequence, which are used for completing synchronization.
Further, the UW sequence comprises 20 UW sequences, the modulation sequence comprises 16 modulation symbols, wherein,
the first 16 UW sequences in the 20 UW sequences are used for frame arrival detection PD and coarse frequency synchronization CFE, and the last 4 UW sequences in the 20 UW sequences are used for frame coarse timing synchronization CTE;
the first 3 symbols of the 16 modulation symbols are null symbols; the last 13 symbols of the 16 modulation symbols are BAKER sequences, and are used for realizing fine timing synchronization FTE.
Further, the UW sequences in the PB0 portion include 20 UW sequences, wherein the first 16 UW sequences in the 20 UW sequences are long UW words, and the last 4 UW sequences in the 20 UW sequences are short UW words;
in a corresponding manner,
the estimating and correcting the frequency offset of the target data frame based on the PB0 part comprises the following steps:
based on the PB0 part, firstly, performing coarse frequency offset estimation by using a short UW word, then performing fine frequency offset estimation by using a long UW word, and correcting the frequency offset of the target data frame based on an estimation result.
Further, the performing the fast synchronization of the target data frame based on the PB1 portion includes:
based on the PB1 part, combining time-frequency synchronization algorithms Schmid1 and Cox to complete the rapid synchronization of the target data frame.
Further, the channel interleaving includes two-stage interleaving, intra-block interleaving, and subframe interleaving.
Further, the modulation process includes quadrature phase shift keying, QPSK, and 16 quadrature amplitude phase modulation, 16QAM.
In this embodiment, the waveform burst structure adopted by the physical layer frame is used in TDD duplex mode, and includes automatic gain control, and a preamble part, a data block part and a guard interval which are formed by PB0 and PB 1. The preamble section is responsible for fast automatic gain control, signal arrival detection, channel frequency error correction, timing error correction, phase error correction, and channel frequency response estimation per frame of data. The preamble of the scheme can realize us-level automatic gain control convergence and rapid synchronization without a phase-locked loop.
In addition, in order to adapt to the TDD duplex mode, a two-layer frame structure design is adopted: physical frames and physical subframes. A physical frame consists of a physical downlink subframe and N uplink subframes (N is less than or equal to 4), wherein the physical subframe consists of the following parts: a preamble part (PB 0, PB 1) for performing synchronization, frequency offset correction, and channel equalization; the MB sequence is used for transmitting related control information (FCH); the DB sequence is used for transmitting a payload, wherein the number of payload data blocks is variable, and can be selected from the following values: 6, 12, 24, 48, 96; at a data block of 6, the frame length is 298us at a 16M symbol rate. After PB0 processing, accurate synchronous positioning to the boundary of the data block is required, and the timing and frequency errors are within the acceptable range of subsequent processing. PB0 comprises three parts: the first 16 UW sequences perform frame arrival detection (PD) and coarse frequency synchronization (CFE), and the last 4 UWs perform frame coarse timing synchronization detection (CTE), ensuring that the synchronization error is less than 1 symbol period. The first three of the 16 modulation symbols are null symbols, padding is adopted, and the last 13 are BAKER sequences, so that fine timing synchronization (FTE) is realized. The PB1 sequence is used for fine frequency offset (FFE) and Fine Timing (FTE) estimation and is also used for channel estimation before equalization, and comprises three parts of a CP and UW_ L, CP, wherein the CP is a cyclic redundancy prefix, and the UW_L is a unique code.
In this embodiment, the transmitting end performs framing according to a predetermined physical layer frame structure based on the information to be transmitted, combines with a data scrambling code, channel interleaving including two-stage interleaving, intra-block interleaving, and sub-frame interleaving, and modulation processing including quadrature phase shift keying QPSK and 16 quadrature amplitude-phase modulation 16QAM, and generates a target data frame; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure includes a preamble part including a PB0 part and a PB1 part; receiving the target data frame by a receiving end, and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame; based on PB0 part, the receiving end estimates the frequency offset of the target data frame and corrects the frequency offset; based on PB1 part, the fast synchronization of the target data frame is completed by combining time-frequency synchronization algorithms Schmid1 and Cox, and the information to be transmitted is obtained by combining demodulation and decoding processing. The high-precision frequency offset estimation specifically comprises the following steps: because the simple carrier frequency offset can generate signal rotation and amplitude weakness, for a single carrier frequency domain equalization (SC-FDE) system, when a block of SC-FDE is changed to a frequency domain through FFT, the frequency deviation at this time can generate inter-carrier interference ICI (inter-carrier interference) on the signal at each frequency point, which cannot be offset through a single tap frequency domain equalizer, and can introduce additional errors during equalization. The frequency domain signal after the final compensation passes through IFFT, and the obtained signal is added with the interference caused by estimation error besides the interference caused by frequency offset. However, this additional interference, after being spread by the IFFT transformation, has been averaged to each symbol, resulting in far less impact than OFDM. But if the frequency offset is not compensated, it can have a significant impact on the block synchronization algorithm and the timing algorithm. The received signal therefore requires frequency offset estimation and compensation. The symmetry between repeated patches a in the preamble (a being the training sequence) can be used to estimate the frequency offset as follows:
Figure BDA0003973235520000081
Δf＝angle(P(d))/(2πLT)
wherein P (d) is the correlation of the front part and the rear part of training symbol data; r is R 1 To receive the first half of the sequence training symbol data,
Figure BDA0003973235520000082
is R 1 Is a conjugate transpose of (2); r is R 2 To receive the second half of the sequence training symbol data; d is the timing deviation to be estimated; k is the kth point of the received sequence training symbol data; l (L) 0 Is the sum of the training symbol length and the cyclic prefix length; l is the length of the cyclic prefix; r () is a certain point expression of the received sequence training symbol data; r is (r) * () Training a conjugated expression of a point of the symbol data for the received sequence; Δf is the frequency offset estimation range; angle () is the angle value of the correlation function; t is the symbol period.
It should be noted that, when the symbols appear in other formulas in the application, the meaning is unchanged, and no description is repeated.
Frequency offset estimation range, precision and L 0 L has a relation. In general, the smaller L is, the larger the estimation range is, the lower the estimation accuracy is, and in some cases, in order to increase the acquisition range, the estimation accuracy is not intended to be lowered, and the L can be increased 0 To reduce the effect of noise on the algorithm. In practical applications, L is generally taken when the signal-to-noise ratio is not very small 0 ＝L。
Due to the fact that the crystal oscillator has deviation, larger frequency deviation can occur in the down-conversion process. For an SC-FDE broadband wireless communication system, when the carrier wave is fc=2 GHz, the deviation d=25 ppm of the general crystal oscillator, and the maximum frequency deviation of the system is 80kHz. We have to ensure that fast fading does not occur during the processing of one symbol (data block) so that the selected data block length is not too long so that a larger frequency offset can be estimated. As the frequency offset range is related to the length L of the UW, the short UW is utilized to perform coarse frequency offset estimation once, and the long UW is utilized to perform fine frequency offset estimation once again. Simulation results show that for the case of smaller frequency offset, only one time of frequency offset estimation is needed by using a long UW. The frequency offset estimation range in the frequency offset estimation range relation is [ -F/2L, F/2L ], the actual maximum frequency offset is 2dFc, and F/2L > 2dFc needs to be satisfied, namely, fc/F < 1/(4 dL) =10e4/L, then L < F > 10e4/fc, when F/fc is too small, L is too small, and the frequency offset estimation precision is reduced. But for coarse frequency offset estimation, the main purpose is to roughly capture the frequency offset, and the improvement of precision is completed after block synchronization and timing synchronization.
In this embodiment, regarding the fast synchronization: the estimation algorithm using training symbols mainly uses the symmetric characteristics of the training symbols to perform sliding correlation on signals. The training symbol adopts a training symbol structure in a time offset estimation algorithm, namely the front part and the back part are the same [ +A, +A ] and the data part except the CP has good autocorrelation, and the A still adopts a Chu sequence format. Let the whole symbol length be N, the CP length be L, and the correlation with the received sequence r (N), the two parts before and after training symbol data is expressed as:
Figure BDA0003973235520000091
and, in addition, the processing unit,
Figure BDA0003973235520000092
definition:
Figure BDA0003973235520000101
for signal energy of a second portion of the received training symbols, defining a timing measure as:
Figure BDA0003973235520000102
under the condition of multiple sampling, if one code element m sampling points, the length of A is L code elements, and the correction formula is as follows:
Figure BDA0003973235520000103
as known from the correlation principle, the time corresponding to the maximum value of the timing measure is the first sample time of the SC-FDE symbol, which represents the start of transmission, namely:
Figure BDA0003973235520000104
in this embodiment, the data scrambling code generating polynomial in the data scrambling code design is:
f(x)＝1+x 14 +x 15
the initialization state may be set. Each physical subframe starts and the scrambler is initialized once. The scrambler scrambles only the load data.
In this embodiment, the channel interleaving design employs two-level interleaving, intra-block interleaving, and sub-frame interleaving. Firstly, according to a modulation mode (QPSK, 16 QAM), serial-parallel converting (N: 1) the coded output bit stream, and when QPSK is modulated, N=2; when 16QAM modulation, n=4. Thus, after serial-to-parallel conversion, each data block number contains 224 symbols.
In this embodiment, the modulation scheme and the baseband waveform use two symbol mapping schemes, namely QPSK and 16QAM, and the baseband shaping adopts root raised cosine shaping. The ALPHA is 0.25. The symbol rate supports 4M, 8M and 16M, the roll-off coefficient is 0.25, and therefore, the corresponding channel bandwidths of the system are 5MHz, 10MHz and 20MHz.
According to the wireless communication method based on the preset physical layer frame structure, the specific transmission process of the target data frame generated by framing according to the preset physical layer frame structure and the specific calculation process in the transmission process are specifically described, so that high-precision frequency offset estimation and quick synchronization of single-carrier frequency domain equalization are realized, transmission delay is reduced by the self-organizing network equipment, and sensitivity of the system to Doppler frequency shift is reduced.
The following describes a wireless communication device based on a predetermined physical layer frame structure, and the wireless communication device based on the predetermined physical layer frame structure and the wireless communication method based on the predetermined physical layer frame structure described below can be referred to correspondingly.
Fig. 3 is a schematic structural diagram of a wireless communication device based on a predetermined physical layer frame structure according to the present invention, as shown in fig. 3, in an embodiment, the wireless communication device based on a predetermined physical layer frame structure according to the present invention includes:
a transmitting module 310, configured to perform framing according to a predetermined physical layer frame structure by using a transmitting end based on information to be transmitted, and combine data scrambling, channel interleaving and modulation processing to generate a target data frame; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure includes a preamble part including a PB0 part and a PB1 part;
a receiving and analyzing module 320, configured to receive the target data frame by a receiving end, and analyze the target data frame to obtain a PB0 portion and a PB1 portion of a preamble portion in the target data frame;
an estimation output module 330, configured to estimate, by a receiving end, a frequency offset of the target data frame based on the PB0 portion and correct the frequency offset; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing.
According to the wireless communication device based on the Ad hoc network physical layer frame structure, the specific transmission process of the target data frame generated by framing according to the preset physical layer frame structure and the specific calculation process in the transmission process are specifically described through the arrangement of the transmission module, the receiving analysis module and the estimation output module, so that high-precision frequency offset estimation and quick synchronization of single-carrier frequency domain equalization are realized, the Ad hoc network equipment reduces transmission delay, and the sensitivity of the system to Doppler frequency shift is reduced.
Fig. 4 illustrates a physical schematic diagram of an electronic device, as shown in fig. 4, which may include: processor 410, communication interface (Communications Interface) 420, memory 430 and communication bus 440, wherein processor 410, communication interface 420 and memory 430 communicate with each other via communication bus 440. The processor 410 may invoke logic instructions in the memory 430 to perform a wireless communication method based on the above-described ad hoc network physical layer frame structure, the method comprising:
the transmitting terminal groups frames according to a preset physical layer frame structure based on the information to be transmitted, and combines data scrambling, channel interleaving and modulation processing to generate a target data frame; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure includes a preamble part including a PB0 part and a PB1 part;
receiving the target data frame by a receiving end, and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame;
estimating and correcting the frequency offset of the target data frame by a receiving end based on the PB0 part; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing.
Further, the logic instructions in the memory 430 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform 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, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In still another aspect, the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, is implemented to perform the wireless communication method based on the above-mentioned ad hoc network physical layer frame structure provided by the above methods, the method comprising:
the transmitting terminal groups frames according to a preset physical layer frame structure based on the information to be transmitted, and combines data scrambling, channel interleaving and modulation processing to generate a target data frame; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure includes a preamble part including a PB0 part and a PB1 part;
receiving the target data frame by a receiving end, and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame;
estimating and correcting the frequency offset of the target data frame by a receiving end based on the PB0 part; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A wireless communication method based on a predetermined physical layer frame structure, comprising:
the transmitting terminal groups frames according to a preset physical layer frame structure based on the information to be transmitted, and combines data scrambling, channel interleaving and modulation processing to generate a target data frame; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure comprises a preamble part, wherein the preamble part comprises a PB0 part and a PB1 part, and is used for completing synchronization and frequency offset correction;
receiving the target data frame by a receiving end, and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame;
estimating and correcting the frequency offset of the target data frame by a receiving end based on the PB0 part; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing.
2. The wireless communication method based on a predetermined physical layer frame structure according to claim 1, wherein the PB0 part includes a UW sequence and a modulation sequence for performing frequency offset correction; the PB1 part comprises a cyclic prefix CP sequence, a unique code UW-L sequence and a cyclic suffix CP sequence, which are used for completing synchronization.
3. The method for wireless communication based on a predetermined physical layer frame structure according to claim 2, wherein the UW sequences comprise 20 UW sequences, the modulation sequences comprise 16 modulation symbols, wherein,
the first 16 UW sequences in the 20 UW sequences are used for frame arrival detection PD and coarse frequency synchronization CFE, and the last 4 UW sequences in the 20 UW sequences are used for frame coarse timing synchronization CTE;
the first 3 symbols of the 16 modulation symbols are null symbols; the last 13 symbols of the 16 modulation symbols are BAKER sequences, and are used for realizing fine timing synchronization FTE.
4. The wireless communication method based on a predetermined physical layer frame structure according to claim 1, wherein the UW sequences in the PB0 portion include 20 UW sequences, wherein the first 16 UW sequences of the 20 UW sequences are long UW words, and the last 4 UW sequences of the 20 UW sequences are short UW words;
in a corresponding manner,
the estimating and correcting the frequency offset of the target data frame based on the PB0 part comprises the following steps:
based on the PB0 part, firstly, performing coarse frequency offset estimation by using a short UW word, then performing fine frequency offset estimation by using a long UW word, and correcting the frequency offset of the target data frame based on an estimation result.
5. The method for wireless communication based on a predetermined physical layer frame structure according to claim 1, wherein said performing the fast synchronization of the target data frame based on the PB1 portion comprises:
based on the PB1 part, combining time-frequency synchronization algorithms Schmid1 and Cox to complete the rapid synchronization of the target data frame.
6. The wireless communication method based on a predetermined physical layer frame structure according to claim 1, wherein the channel interleaving comprises two-stage interleaving, intra-block interleaving, and sub-frame interleaving.
7. The wireless communication method based on a predetermined physical layer frame structure according to claim 1, wherein the modulation process includes quadrature phase shift keying QPSK and 16 quadrature amplitude phase modulation 16QAM.
8. A wireless communications apparatus based on a predetermined physical layer frame structure, comprising:
the transmitting module is used for framing according to a preset physical layer frame structure by a transmitting end based on information to be transmitted, and generating a target data frame by combining data scrambling, channel interleaving and modulation processing; the sending end is any node for sending target information in the ad hoc network; the predetermined physical layer frame structure includes a preamble part including a PB0 part and a PB1 part;
the receiving and analyzing module is used for receiving the target data frame by a receiving end and analyzing the target data frame to obtain a PB0 part and a PB1 part of a leading part in the target data frame;
the estimating output module is used for estimating the frequency offset of the target data frame and correcting the frequency offset based on the PB0 part by a receiving end; based on the PB1 part, the fast synchronization of the target data frame is completed, and the information to be sent is obtained by combining demodulation and decoding processing.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the wireless communication method based on a predetermined physical layer frame structure as claimed in any one of claims 1 to 7 when the program is executed.
10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the wireless communication method based on a predetermined physical layer frame structure according to any of claims 1 to 7.
CN202211526601.7A 2022-11-30 2022-11-30 Ad hoc network physical layer frame structure and wireless communication method Pending CN116232821A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116667972A (en) * 2023-08-01 2023-08-29 南京朗立微集成电路有限公司 WiFi frame structure for sensing and WiFi detection method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116667972A (en) * 2023-08-01 2023-08-29 南京朗立微集成电路有限公司 WiFi frame structure for sensing and WiFi detection method
CN116667972B (en) * 2023-08-01 2023-12-12 南京朗立微集成电路有限公司 WiFi frame structure for sensing and WiFi detection method

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