WAPI-ZigBee frequency domain coexistence communication method and system based on subcarrier suppression

Abstract

The invention discloses a WAPI-ZigBee frequency domain coexistence communication method and system based on subcarrier suppression, and the method is characterized in that before data transmission, the channel state is sensed through a WAPI node, all available subcarriers are recognized, and a corresponding subcarrier elimination mode is adopted; the transmitter transmits corresponding subcarrier elimination mode information to the STS / LTS processing module and then transmits the subcarrier elimination mode information to the data processing and modulation module; rearranging the position of the pilot frequency on the subcarrier, improving the interleaving and de-interleaving processes, and implementing communication through a data processing and modulation module; the receiver explores the spectral characteristics of the received signal to identify the overlap pattern, and the cancelled subcarriers do not perform data processing.

Description

Technical Field

[0001] The present invention relates to a field, and more specifically, to a WAPI-ZigBee frequency domain coexistence communication method and system based on subcarrier suppression. Background Art

[0002] In the 2.4 GHz ISM band, wireless local area networks (WAPI) and low-power wireless sensor networks (such as ZigBee) are widely deployed in urban, industrial, home, and medical scenarios. WAPI networks are typically based on the IEEE 802.11g protocol and use orthogonal frequency division multiplexing (OFDM) technology, dividing a 20 MHz bandwidth into 64 subcarriers for high-speed data transmission. ZigBee networks, on the other hand, use the IEEE 802.15.4 protocol to transmit lower-speed data across 16 2 MHz bandwidth channels.

[0003] With the rapid development of the Internet of Things (IoT), these two heterogeneous wireless networks are increasingly coexisting in the same frequency band, leading to signal conflicts and wasted spectrum resources. Existing technologies primarily rely on time-domain coordination strategies, such as using busy tones, learning WAPI idle time slots, or controlling transmission timing. However, these methods often rely on coordination mechanisms, are not adaptable to existing WAPI devices, and can significantly reduce WAPI throughput, especially at high WAPI data rates.

[0004] Frequency-domain coexistence technology has attracted attention as a new solution, but existing frequency-domain methods often require modifications to the WAPI protocol stack or the introduction of centralized management and control, making them difficult to implement in practice. Traditional time-domain coexistence techniques severely impact WAPI performance, requiring frequent backoffs and reducing overall network throughput. Existing frequency-domain solutions are incompatible with traditional WAPI systems and require device reconfiguration or collaboration mechanisms, resulting in high deployment costs. There is a lack of uncoordinated, adaptive frequency-domain coexistence mechanisms, and currently, there is no frequency-domain reuse method that does not require WAPI-ZigBee coordination and can switch in real time. WAPI subcarrier interference is difficult to locally avoid, and subcarrier interference on ZigBee signals is difficult to accurately identify and avoid.

[0005] Therefore, there is an urgent need for a frequency domain coexistence technology that does not require coordination, is compatible with existing equipment, and can improve overall network performance. Summary of the Invention

[0006] In order to solve the deficiencies in the prior art, the present invention provides a WAPI-ZigBee frequency domain coexistence communication method and system based on subcarrier suppression.

[0007] The present invention adopts the following technical solutions.

[0008] A first aspect of the present invention relates to a WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression, the method comprising the following steps:

[0009] Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts the corresponding subcarrier elimination mode;

[0010] The transmitter passes the corresponding subcarrier elimination pattern information to the STS / LTS processing module, and then transmits it to the data processing and modulation module;

[0011] Rearrange the position of pilots on subcarriers, improve the interleaving and deinterleaving process, and implement communication through data processing and modulation modules;

[0012] The receiver explores the spectral characteristics of the received signal to identify overlapping patterns, and the subcarriers that are cancelled out are not processed for data.

[0013] Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts the corresponding subcarrier elimination mode, including:

[0014] The WAPI node senses the channel status and if the energy of all subcarriers overlapping with the four ZigBee channels is below the threshold, the transmitter uses the "standard" mode;

[0015] When the energy of the overlapping ZigBee channels is higher than the threshold, the transmitter will adopt the corresponding subcarrier cancellation mode.

[0016] Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts the corresponding subcarrier elimination mode, including:

[0017] In WAPI's "standard" mode, the subcarriers are numbered from -26 to 26;

[0018] The corresponding subcarrier cancellation modes are marked as "Mode 1", "Mode 2", "Mode 3" and "Mode 4" respectively.

[0019] The corresponding subcarrier cancellation modes are marked as "Mode 1", "Mode 2", "Mode 3" and "Mode 4", including:

[0020] In "Mode 1", subcarriers numbered -26, -25, -24, -23, -22, -21, -20, and -19 are cancelled;

[0021] In "Mode 2", subcarriers numbered -10 to -3 are cancelled;

[0022] In "Mode 3", subcarriers numbered 6 to 13 are cancelled;

[0023] In "Mode 4", subcarriers numbered 21 to 26 are cancelled;

[0024] In "Mode 1", "Mode 2", "Mode 3" and "Mode 4", the subcarriers used as pilots are cancelled, and the pilot structure is redesigned to subcarriers numbered -16 and 16.

[0025] Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts the corresponding subcarrier elimination mode, including:

[0026] The STS / LTS processing module is used to set the training symbols of the subcarriers overlapping with the ZigBee signal to zero;

[0027] Set the training symbols for all available subcarriers to those of the "normal" mode.

[0028] Rearrange the pilot positions on the subcarriers, improve the interleaving and deinterleaving process, and implement communication through the data processing and modulation modules, including:

[0029] The data processing and modulation modules identify the interleaving depth of the corresponding subcarrier elimination pattern, improve the interleaving and deinterleaving process, and construct data subcarriers;

[0030] According to the corresponding subcarrier elimination pattern, the pilot subcarriers are constructed.

[0031] The receiver explores the spectral characteristics of the received signal to identify overlapping patterns. The subcarriers that are cancelled out do not receive data processing, including:

[0032] The receiver collects incoming data packets and identifies the pilot subcarriers through energy detection;

[0033] The data subcarrier is detected by STS autocorrelation, and the deinterleaving mode is obtained according to the position of the data subcarrier.

[0034] A second aspect of the present invention relates to a WAPI-ZigBee frequency domain coexistence communication system based on subcarrier suppression, which is implemented using the WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression described in the first aspect of the present invention;

[0035] The system includes a sensing module, a transmitting module, a communication module and a receiving module;

[0036] The sensing module is used to sense the channel status through the WAPI node before transmitting data, identify all available subcarriers, and adopt the corresponding subcarrier elimination mode;

[0037] The transmission module is used for the transmitter to transmit the corresponding subcarrier elimination mode information to the STS / LTS processing module, and then transmit it to the data processing and modulation module;

[0038] The communication module is used to rearrange the position of the pilot on the subcarrier, improve the interleaving and deinterleaving process, and implement communication through the data processing and modulation module;

[0039] The receiving module is used by the receiver to explore the spectrum characteristics of the received signal to identify the overlapping pattern, and the cancelled subcarriers will not be processed for data.

[0040] A third aspect of the present invention relates to a terminal, comprising a processor and a storage medium; the storage medium is used to store instructions; and the processor is used to operate according to the instructions to execute the steps of the method described in the first aspect of the present invention.

[0041] A fourth aspect of the present invention relates to a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the first aspect of the present invention.

[0042] The beneficial effect of the present invention is that, compared with the prior art, the WAPI-ZigBee frequency domain coexistence communication method and system based on subcarrier suppression in the present invention, without modifying the ZigBee protocol and relying on the coordination mechanism, achieves efficient sharing of spectrum resources by finely controlling the WAPI subcarriers to avoid the frequencies being used by ZigBee.

[0043] The beneficial effects of the present invention also include:

[0044] 1. No time coordination required, enabling concurrent communication: ZigBee and WAPI can send data simultaneously, avoiding delays caused by ZigBee waiting for WAPI backoff, significantly improving system real-time performance;

[0045] 2. Compatible with legacy devices and low deployment cost: The ZigBee network does not require any changes, and the WAPI system can dynamically switch to coexistence mode to adapt to legacy terminals;

[0046] 3. System throughput increased by 2-3 times: In experiments, the combined throughput of WAPI and ZigBee increased by more than 2 times compared to traditional time-domain coexistence solutions, especially in high-load scenarios.

[0047] 4. Strong robustness and adaptability: The system can accurately detect ZigBee interference, automatically switch to the corresponding subcarrier mode, and adapt to various overlapping channel scenarios;

[0048] 5. Preserve the OFDM core structure to ensure WAPI demodulation performance: Even if some subcarriers are "empty", the synchronization and channel estimation of the WAPI system remain stable, ensuring decoding accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of a WAPI-ZigBee frequency domain coexistence communication system based on subcarrier suppression according to the present invention;

[0050] Figure 2 This is a diagram of the subcarrier allocation pattern of the present invention;

[0051] Figure 3 The diagram shows the spectrum of the signal received when WAPI and ZigBee coexist and the amplitude variation in different overlapping modes according to the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present invention clearer and more accurate, the technical solutions of the present invention are described in detail below through multiple specific embodiments. The embodiments used in the present invention are only used to explain the present invention and are not intended to limit the content of the present invention.

[0053] A first aspect of the present invention relates to a WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression, the method comprising the following steps:

[0054] Step 1: Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts the corresponding subcarrier elimination mode.

[0055] According to the channel allocation specified in IEEE 802.11 and IEEE 802.15.4, there are four frequency overlapping modes. For each overlapping mode, the subcarrier allocation problem needs to be formally solved. The subcarrier allocation mode is as follows Figure 2 As shown, the standard subcarrier allocation mode of WAPI is Figure 2 The subcarriers are numbered from -26 to 26 and are used as data subcarriers, but -21, -7, 7, and 21 are used as pilot subcarriers. In order to achieve coexistence of WAPI and ZigBee networks, the subcarriers overlapping with the ZigBee channel should be cancelled, that is, no data or pilot data is allocated to these subcarriers. The four different channel overlapping modes correspond to four different subcarrier cancellation modes. Figure 2These subcarrier cancellation patterns are shown in Figure 1, labeled "Mode 1," "Mode 2," "Mode 3," and "Mode 4." Specifically, in "Mode 1," subcarriers numbered -26, -25, -24, -23, -22, -21, -20, and -19 are cancelled. In "Mode 2," subcarriers numbered -10 through -3 are cancelled. In "Mode 3," subcarriers numbered 6 through 13 are cancelled. Finally, in "Mode 4," six subcarriers are cancelled: 21, 22, 23, 24, 25, and 26.

[0056] To eliminate interference between WAPI and ZigBee networks, the transmitter must decide which subcarrier nulling mode to use before data transmission. Before transmitting data, the node must sense the channel status. If the energy of all subcarriers overlapping the four ZigBee channels is below a threshold, the transmitter uses the "standard" mode, which utilizes all available subcarriers. If the energy of the overlapping ZigBee channels exceeds the threshold, the transmitter adopts the corresponding subcarrier nulling mode. The transmitter then passes this information to the STS / LTS processing module, which then passes it on to the data processing and modulation module. Otherwise, the channel is busy, and the transmitter postpones its transmission.

[0057] The WAPI channel is set to Channel 1 (center frequency 2.412 GHz) and the ZigBee channel is set to Channel 11 (center frequency 2.405 GHz). The WAPI system dynamically identifies the overlapping part of the two spectrum and performs subcarrier suppression.

[0058] Step 2: The transmitter passes the corresponding subcarrier elimination pattern information to the STS / LTS processing module, and then transmits it to the data processing and modulation module.

[0059] The STS / LTS processing module is used to set the training symbols of the subcarriers overlapping with the ZigBee signal to zero; and the training symbols of all available subcarriers are set to the training symbols of the "standard" mode.

[0060] The Short Training Symbol (STS) in IEEE 802.11 WAPI networks consists of 12 subcarriers modulated by elements of S-26:26. Non-zero amplitudes exist in spectral lines indexed by multiples of 4, making the period TFFT / 4 = 0.8us (i.e., 16 complex samples). WAPI receivers use this property to detect incoming packets. To enable subcarrier cancellation for overlapping ZigBee channels, nodes should not use the subcarriers specified in the subcarrier cancellation mode. Therefore, the subcarriers overlapping with the ZigBee signal are set to zero according to the standard STS.

[0061] According to the IEEE 802.11 standard, the Long Training Symbol (LTS) consists of 53 subcarriers (including a zero at DC). The receiver uses the known LTS to perform channel and fine frequency offset estimation. To enable nodes to coexist with ZigBee networks, the transmitter sets some subcarriers to zero according to a zeroing pattern. Because different subcarrier nulling patterns result in different LTS sequences, this characteristic is exploited to allow receiving nodes to detect subcarrier nulling patterns.

[0062] Step 3: Rearrange the position of the pilots on the subcarriers, improve the interleaving and deinterleaving process, and implement communication through the data processing and modulation modules.

[0063] It should be noted that the subcarrier used as a pilot should also be cancelled. In order to maintain the phase tracking capability, the pilot structure is redesigned, such as Figure 2 As shown, the subcarriers numbered -16 and 16 are cancelled as pilot subcarriers. In addition to redesigning the pilot structure, the structure of the preamble should also be carefully handled. In standard mode, four subcarriers are dedicated to pilot signals to enhance the robustness of coherent demodulation to residual carrier frequency error and phase noise. These pilot signals are arranged symmetrically, which simplifies the phase tracking process. Specifically, these pilot signals are located at subcarriers -21, -7, 7 and 21, respectively. In order to maintain this feature in different overlapping modes, the number of pilot subcarriers is reduced from 4 to 2, and the positions of the pilots at subcarriers -16 and 16 are rearranged, as shown in Figure 2. Figure 2 shown.

[0064] The positions of pilots on subcarriers are rearranged, interleaving and deinterleaving processes are improved, and communication is implemented through a data processing and modulation module, including: identifying the interleaving depth of a corresponding subcarrier elimination pattern through the data processing and modulation module, improving the interleaving and deinterleaving processes, and constructing data subcarriers; and constructing pilot subcarriers according to the corresponding subcarrier elimination pattern.

[0065] When the incoming samples and subcarrier cancellation pattern information are passed to the data processing module, an FFT is first applied according to the IEEE 802.11 standard. The frequency domain data of each subcarrier is then mapped to the corresponding data sequence, so that the canceled subcarriers are not further processed.

[0066] The present invention improves the interleaving and deinterleaving process of the system, and the interleaving depth determines the robustness against burst interference. Please note that some subcarriers are cancelled in the system, so the number of subcarriers used for data transmission does not conform to the standard system. The interleaving depth in the IEEE802.11 standard is 16. However, in the system, the interleaving depth should be set according to the number of available data subcarriers. For the subcarrier cancellation modes "Mode1", "Mode2" and "Mode3", 8 consecutive subcarriers are set to zero. After subtracting 2 pilot subcarriers, there are 42 available subcarriers for data transmission. Therefore, the interleaving depth can be set to 14. At the same time, the interleaving depth of the "Mode4" subcarrier zeroing mode is slightly different, requiring 44 data subcarriers, so the interleaving depth is set to 11 accordingly.

[0067] The system's interleaving and deinterleaving processes are optimized based on the interleaving depth, subcarrier cancellation pattern, and the overlap between WAPI and ZigBee channels. Pre-training is used to minimize the subcarrier suppression ratio during the interleaving and deinterleaving processes, yielding the optimal interleaving and deinterleaving schemes for different interleaving depths, subcarrier cancellation patterns, and overlap between WAPI and ZigBee channels. Alternative interleaving and deinterleaving schemes include commonly used codecs and can also support forward error correction and feedback-checked data output.

[0068] In step 4, the receiver explores the spectral characteristics of the received signal to identify overlapping patterns, and the canceled subcarriers are not processed.

[0069] The transmitter uses a spectrum sensing module to identify ZigBee interference, select the corresponding null mode, and construct an OFDM frame. The receiver performs FFT processing on the received data, automatically determines the null mode based on the pilot position and spectrum energy diagram, and enters the corresponding path for decoding. The system supports eight WAPI modulation modes (BPSK to 64QAM) and maintains a low bit error rate (BER) and stable throughput under different subcarrier configurations.

[0070] On the receiver side, the spectral characteristics of the received signal are explored to identify overlapping patterns. Inbound packets are first identified through energy detection. Typically, WAPI packets are detected through autocorrelation with the STS. However, due to interference from the ZigBee signal, autocorrelation does not work properly. The spectral characteristics of different overlapping patterns vary. When a subcarrier is interfered with by the ZigBee signal, its amplitude changes more dramatically than other subcarriers. This characteristic is illustrated in Figure 3 The image shows the received signal spectrum when WAPI and ZigBee coexist, illustrating the amplitude variations in different overlapping modes. It can be seen that the amplitude variation in "Mode 2" is much higher than in the other modes. Nodes can effectively coexist in the ZigBee network.

[0071] The WAPI node of the present invention senses the interference of the ZigBee frequency band, selects the corresponding subcarrier hole mode (Mode1 to Mode4) according to the overlapping frequency point, sets the corresponding subcarrier to 0 according to the mode, and reconstructs the pilot subcarrier and the leading sequence structure. The receiving end identifies different subcarrier modes and uses an improved demodulation mechanism to maintain compatibility. It realizes non-coordinated concurrent communication between WAPI and ZigBee, is compatible with standard equipment, and improves the overall spectrum utilization efficiency. By introducing a subcarrier suppression mechanism in the WAPI system and combining the spectrum characteristics of the ZigBee signal, the frequency domain coexistence of WAPI and ZigBee networks in the 2.4GHz frequency band is achieved.

[0072] WAPI and ZigBee packet delivery rates (PDR) and network throughput were tested at different signal-to-noise ratios (SNRs). When WAPI and ZigBee were transmitting data simultaneously, the system maintained a WAPI PDR > 90% and a ZigBee PDR > 80%. Compared to traditional TDMA mechanisms, WAPI network throughput increased by 2.8 times, while ZigBee throughput increased by approximately 2 times. The system automatically detects interference and switches subcarrier patterns to adapt to different ZigBee channels. On the WAPI transmitter, the short training sequence (STS) and long training sequence (LTS) in the original OFDM frame structure are reconstructed according to different subcarrier hole patterns to ensure frame synchronization and channel estimation. The WAPI receiver uses a pattern recognition algorithm based on spectral characteristics to automatically identify whether the received data packet is in a hole pattern and adjust the demodulation logic.

[0073] With the advancement of smart grid construction and digital transformation, new smart systems such as smart inspections, intelligent monitoring, and mobile operations are becoming standard features in digital substation construction to improve substation operational efficiency and safety. These new smart system scenarios generally feature mobility and decentralization. In the substation's trusted WLAN network, inspection robots, intelligent inspection cameras, intelligent grounding wires, mobile operation terminals, and their uplink communication nodes function as WAPI nodes to communicate with the substation master station, facing the challenge of complex electromagnetic interference. In one embodiment, the method of the present invention is used to ensure the stable coexistence of WAPI and IoT signals within the complex electromagnetic environment of UHV AC / DC stations.

[0074] The second aspect of the present invention relates to a WAPI-ZigBee frequency domain coexistence communication system based on subcarrier suppression, such as Figure 1As shown, the system is implemented using a WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression in the first aspect of the present invention; the system includes a perception module, a transmission module, a communication module and a receiving module; the perception module is used to perceive the channel state through the WAPI node before transmitting data, identify all available subcarriers, and adopt the corresponding subcarrier elimination mode; the transmission module is used for the transmitter to pass the corresponding subcarrier elimination mode information to the STS / LTS processing module, and then transmit it to the data processing and modulation module; the communication module is used to rearrange the position of the pilot on the subcarrier, improve the interleaving and deinterleaving process, and implement communication through the data processing and modulation module; the receiving module is used for the receiver to explore the spectrum characteristics of the received signal to identify the overlapping pattern, and the offset subcarriers will not be processed for data.

[0075] A third aspect of the present invention relates to a terminal, comprising a processor and a storage medium; the storage medium is used to store instructions; and the processor is used to operate according to the instructions to execute the steps of the method described in the first aspect of the present invention.

[0076] A fourth aspect of the present invention relates to a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in the first aspect of the present invention.

[0077] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that the technical solutions of the present invention still include modifications or equivalent substitutions that may be made to the specific embodiments of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention are intended to be covered by the claims of the present invention.

Claims

1. A WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression, characterized in that: The method comprises the following steps: Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts the corresponding subcarrier elimination mode; The transmitter passes the corresponding subcarrier elimination pattern information to the STS / LTS processing module, and then transmits it to the data processing and modulation module; Rearrange the position of pilots on subcarriers, improve the interleaving and deinterleaving process, and implement communication through data processing and modulation modules; The receiver explores the spectral characteristics of the received signal to identify overlapping patterns, and the subcarriers that are cancelled out are not processed for data.

2. The WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression according to claim 1, characterized in that: Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts a corresponding subcarrier elimination mode, including: The WAPI node senses the channel status. If the energy of all subcarriers overlapping the four ZigBee channels is below the threshold, the transmitter uses the "standard" mode. When the energy of the overlapping ZigBee channels is higher than the threshold, the transmitter will adopt the corresponding subcarrier cancellation mode.

3. The WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression according to claim 2, characterized in that: Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts a corresponding subcarrier elimination mode, including: In WAPI's "standard" mode, the subcarriers are numbered from -26 to 26; The corresponding subcarrier cancellation modes are marked as "Mode 1", "Mode 2", "Mode 3" and "Mode 4" respectively.

4. The WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression according to claim 3, characterized in that: The corresponding subcarrier cancellation modes are labeled "Mode 1", "Mode 2", "Mode 3" and "Mode 4", respectively, and include: In "Mode 1", subcarriers numbered -26, -25, -24, -23, -22, -21, -20, and -19 are cancelled; In "Mode 2", subcarriers numbered -10 to -3 are cancelled; In "Mode 3", subcarriers numbered 6 to 13 are cancelled; In "Mode 4", subcarriers numbered 21 to 26 are cancelled; In "Mode 1", "Mode 2", "Mode 3" and "Mode 4", the subcarriers used as pilots are cancelled, and the pilot structure is redesigned to subcarriers numbered -16 and 16.

5. The WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression according to claim 4, characterized in that: Before transmitting data, the WAPI node senses the channel status, identifies all available subcarriers, and adopts a corresponding subcarrier elimination mode, including: The STS / LTS processing module is used to set the training symbols of the subcarriers overlapping with the ZigBee signal to zero; Set the training symbols for all available subcarriers to the "normal" mode training symbols.

6. The WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression according to claim 5, characterized in that: The method of rearranging the positions of pilots on subcarriers, improving the interleaving and deinterleaving processes, and implementing communications through data processing and modulation modules includes: The data processing and modulation modules identify the interleaving depth of the corresponding subcarrier elimination pattern, improve the interleaving and deinterleaving process, and construct data subcarriers; According to the corresponding subcarrier elimination pattern, the pilot subcarriers are constructed.

7. The WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression according to claim 6, characterized in that: The receiver explores the spectral characteristics of the received signal to identify overlapping patterns. The subcarriers that are cancelled out do not undergo data processing, including: The receiver collects incoming data packets and identifies the pilot subcarriers through energy detection; The data subcarrier is detected by STS autocorrelation, and the deinterleaving mode is obtained according to the position of the data subcarrier.

8. A WAPI-ZigBee frequency domain coexistence communication system based on subcarrier suppression, characterized by: The system is implemented using a WAPI-ZigBee frequency domain coexistence communication method based on subcarrier suppression according to any one of claims 1 to 7; The system includes a sensing module, a transmitting module, a communication module and a receiving module; The sensing module is used to sense the channel status through the WAPI node before transmitting data, identify all available subcarriers, and adopt the corresponding subcarrier elimination mode; The transmission module is used for the transmitter to transmit the corresponding subcarrier elimination mode information to the STS / LTS processing module, and then transmit it to the data processing and modulation module; The communication module is used to rearrange the position of the pilot on the subcarrier, improve the interleaving and deinterleaving process, and implement communication through the data processing and modulation module; The receiving module is used by the receiver to explore the spectrum characteristics of the received signal to identify the overlapping pattern, and the cancelled subcarriers will not be processed for data.

9. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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