FCS and FH-OFDM combined high-speed anti-interference communication method and system

Abstract

The invention discloses an FCS and FH-OFDM combined high-speed anti-interference communication method and system. The method comprises the following steps: S1, acquiring a frequency sensing result of a home terminal; s2, converting the frequency sensing result of the home terminal into a detection message, and transmitting the detection message to a neighbor node; s3, performing fusion analysis on the neighbor nodes to obtain fusion information, and transmitting the fusion information to a home terminal node; s4, forming an available sending frequency set by the home terminal node; s5, acquiring communication information, acquiring decision information, and performing frequency hopping communication according to the decision information and the communication information; and S6, repeating the steps S1 to S5 until the communication is finished. According to the invention, the anti-interference capability is strong, the multipath effect of complex environment transmission can be effectively resisted, and high-reliability transmission performance and higher transmission capacity are provided for the system; frequency sensing is carried out on idle time slots through the FCS, frequency points with serious interference are deducted, the error rate of communication is further reduced, and the anti-interference and data transmission capabilities of a communication system are improved.

Description

Technical Field

[0001] The present invention belongs to the field of communication technology, and in particular relates to a high-speed anti-interference communication method and system combining FCS with FH-OFDM. Background Art

[0002] Wireless communication achieves wireless data transmission through electromagnetic signals. However, when communication electromagnetic signals propagate in free space, they are also affected by factors such as natural interference and human interference, which seriously affects the normal communication process.

[0003] In communication, especially military radio communication, higher requirements are placed on communication. Therefore, anti-interference communication technology is needed to ensure the normal communication process; however, the existing anti-interference communication method can only demodulate and estimate the channel of the received signal, which is not real-time, has weak anti-interference performance, and has a high bit error rate. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high-speed anti-interference communication method and system combining FCS with FH-OFDM.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a high-speed anti-interference communication method combining FCS and FH-OFDM, comprising the following steps:

[0007] S1. The local node performs channel sensing through the FCS module to obtain the local frequency sensing result;

[0008] S2: The local node converts the local frequency sensing result into a detection message and transmits the detection message to the neighboring node through the FCS interaction channel;

[0009] S3, the neighboring node performs fusion analysis on the received detection message, obtains fusion information, and transmits the fusion information to the local node;

[0010] S4, the local node forms an available transmission frequency set according to the fusion information;

[0011] S5. The local node obtains communication information, obtains decision information according to the available transmission frequency set, and performs frequency hopping communication according to the decision information and the communication information;

[0012] S6. Repeat steps S1-S5 until the communication is completed.

[0013] Preferably, the performing channel sensing by the FCS module comprises the following steps:

[0014] The main control module is configured with FCS frequency table;

[0015] The FCS module obtains the current frame structure design of the MAC layer, and configures the active sensing frequency set according to the FCS frequency table and the current frame structure design of the MAC layer;

[0016] The MAC layer performs channel sensing based on the active sensing frequency set to obtain frequency sensing results.

[0017] Preferably, sending the detection message to the neighbor node through the FCS interaction channel includes the following steps:

[0018] The main control module is configured with FCS frequency table;

[0019] The FCS module obtains the current frame structure design of the MAC layer, configures the broadcast frequency set according to the FCS frequency table and the current frame structure design of the MAC layer, and obtains the FCS interaction channel according to the broadcast frequency set;

[0020] The MAC layer sends the detection message to the neighbor node through the FCS interaction channel.

[0021] Preferably, the neighbor node performs fusion analysis on the received detection message, and obtaining fusion information includes the following steps:

[0022] Neighboring nodes perform channel sensing through FCS and obtain neighbor frequency sensing results;

[0023] The neighbor node integrates and analyzes the neighbor frequency perception results and the detection message to obtain integrated information.

[0024] Preferably, transmitting the fusion information to the local node specifically refers to: transmitting the fusion information to the local node via an FCS interaction channel and a fixed TDMA control channel.

[0025] Preferably, the local node forms an available transmission frequency set according to the fusion information, comprising the following steps:

[0026] Obtain frequency points by fusing information;

[0027] According to the availability and quality of the frequency points, the available frequency points are divided into grades to obtain the available frequency points, wherein the available frequency points include an unavailable grade, a minimum rate passable grade, a basic available grade, and a stable available grade;

[0028] Get the available transmission frequency set according to the available frequency points.

[0029] Preferably, the local node acquires communication information, acquires decision information according to an available transmission frequency set, and performs frequency hopping communication according to the decision information and the communication information, including the following steps:

[0030] The local node obtains communication information;

[0031] Obtaining decision information based on a set of available transmission frequencies;

[0032] Acquire radio frequency according to decision information;

[0033] The decision information and communication information are radio-processed according to the radio frequency and sent to neighboring nodes;

[0034] The neighbor node demodulates, obtains the returned communication information, obtains the radio frequency according to the decision information, and sends the returned communication information to the local node.

[0035] Preferably, the obtaining of the radio frequency according to the decision information comprises the following steps:

[0036] Set the frequency hopping frequency table;

[0037] Acquire a frequency hopping sequence according to the decision information;

[0038] The frequency hopping sequence and the frequency hopping frequency table are combined through the frequency hopping modulator to obtain the radio frequency frequency.

[0039] A high-speed anti-interference communication system combining FCS and FH-OFDM, realizing the above-mentioned high-speed anti-interference communication method, comprises a local node and a neighboring node;

[0040] The local node is used as the main body of the communication system to communicate with neighboring nodes;

[0041] The neighbor node is used to assist the local node in acquiring the available transmission frequency set and decision information, and communicate with the local node;

[0042] The local node or neighboring node includes a main control module, an FCS module, a MAC layer, an FCS interaction channel, a fixed TDMA control channel and a frequency hopping modulator;

[0043] The main control module is used to configure the FCS frequency table;

[0044] The FCS module is used to configure an active sensing frequency set and a broadcast frequency set;

[0045] The MAC layer is used to perform channel sensing, obtain frequency sensing results, and send detection messages;

[0046] The FCS interaction channel is used to transmit detection messages and fusion information;

[0047] The fixed TDMA control channel is used to transmit fusion information;

[0048] The frequency hopping modulator is used to implement frequency hopping communication.

[0049] Preferably, the local node or neighboring node further includes: an information modulator, a frequency hopping demodulator, and an information demodulator;

[0050] The information modulator is used to transmit the communication information to the frequency hopping modulator and obtain the frequency hopping sequence according to the decision information;

[0051] The frequency hopping demodulator is used to demodulate frequency hopping communication, complete frequency hopping synchronization, and obtain communication information and decision information;

[0052] The information demodulator is used to demodulate the communication information received by the frequency hopping demodulator, and obtain the frequency hopping sequence according to the received decision information.

[0053] The beneficial effects of the present invention are:

[0054] 1. Wireless communication through frequency hopping technology has strong anti-interference ability, which can effectively combat the multipath effect of transmission in complex environments, providing the system with high-reliability transmission performance and higher transmission capacity;

[0055] 2. FCS performs frequency sensing in idle time slots, removes frequencies with severe interference before establishing a communication link and before sending communication data during communication link establishment, further reduces the communication bit error rate, and improves the anti-interference and data transmission capabilities of the communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 This is a flow chart of a high-speed anti-interference communication method provided by an embodiment of the present invention.

[0057] Figure 2 It is a schematic diagram of the structure of a high-speed anti-interference communication system provided by an embodiment of the present invention;

[0058] Figure 3 It is a schematic diagram of the principle of channel sensing and sending detection messages provided by an embodiment of the present invention;

[0059] Figure 4 It is a schematic diagram of the fusion analysis principle provided by an embodiment of the present invention;

[0060] Figure 5 It is a schematic diagram of the frequency hopping communication principle provided by an embodiment of the present invention;

[0061] Figure 6 It is a schematic diagram of an application scenario provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0063] like Figure 6As shown in the figure, several broadband radio stations are used in military radio communications, and the electromagnetic environment and natural environment in the area are relatively complex. Affected by many factors such as ground objects, landforms and sea conditions, the receiver receives electromagnetic waves that arrive through several paths such as refraction, reflection and direct radiation. The phases of these electromagnetic waves arriving from different paths are inconsistent and time-varying, resulting in a fading state of the received signal. The different arrival delays of these electromagnetic waves lead to inter-code interference. If the intensity of multiple rays is large and the delay difference cannot be ignored, bit errors will occur.

[0064] In this embodiment, the first broadband radio station is used as the local node, the second broadband radio station and the third broadband radio station are used as neighboring nodes, and radio communication is performed through a high-speed anti-interference communication method combining FCS and FH-OFDM of the present invention.

[0065] Among them, FCS refers to idle channel scanning; FH-OFDM refers to full digital broadband frequency hopping.

[0066] like Figure 1 As shown, a high-speed anti-interference communication method combining FCS and FH-OFDM includes the following steps:

[0067] S1. The local node performs channel sensing through the FCS module to obtain the local frequency sensing result;

[0068] The channel sensing by the FCS module comprises the following steps:

[0069] The main control module is configured with FCS frequency table;

[0070] The FCS module obtains the current frame structure design of the MAC layer, and configures the active sensing frequency set according to the FCS frequency table and the current frame structure design of the MAC layer;

[0071] The MAC layer performs channel sensing based on the active sensing frequency set to obtain frequency sensing results.

[0072] like Figure 3 As shown in FIG. 1 , for the active sensing frequency set, the MAC layer interacts with the physical layer according to the time slot design to achieve specific channel sensing. Among them, the MAC layer is the link layer, and the PHY is the physical layer.

[0073] S2: The local node converts the local frequency sensing result into a detection message and transmits the detection message to the neighboring node through the FCS interaction channel;

[0074] The sending of the detection message to the neighbor node through the FCS interaction channel comprises the following steps:

[0075] The main control module is configured with FCS frequency table;

[0076] The FCS module obtains the current frame structure design of the MAC layer, configures the broadcast frequency set according to the FCS frequency table and the current frame structure design of the MAC layer, and obtains the FCS interaction channel according to the broadcast frequency set;

[0077] The MAC layer sends the detection message to the neighbor node through the FCS interaction channel.

[0078] MAC only needs to send messages according to the time slot and frequency specified in the interactive control message.

[0079] S3, the neighboring node performs fusion analysis on the received detection message, obtains fusion information, and transmits the fusion information to the local node;

[0080] like Figure 4 As shown, the neighbor node performs fusion analysis on the received detection message, and obtaining fusion information includes the following steps:

[0081] Neighboring nodes perform channel sensing through FCS and obtain neighbor frequency sensing results;

[0082] Here, channel sensing is performed through FCS, which is consistent with the specific steps of performing channel sensing through FCS in S1.

[0083] The neighbor node integrates and analyzes the neighbor frequency perception results and the detection message to obtain integrated information.

[0084] Among them, fusion analysis refers to sorting the quality of frequency points in the FCS frequency table of the local node. When the interference perception feedback is given, it is necessary to consider the mechanism of not making abnormal judgments for the instantaneous and occasional interference of the frequency;

[0085] The transmitting the fused information to the local node specifically refers to: transmitting the fused information to the local node through the FCS interaction channel and the fixed TDMA control channel.

[0086] The reason for using a fixed TDMA control channel is to improve the timeliness of information transmission.

[0087] Both the local node and the neighboring node perform channel perception through the FCS module, and obtain fusion information through fusion analysis to eliminate interference frequencies, that is, Figure 6 Channel 2 in obtains the communication frequency that is available to both parties, that is, Figure 6 Channel 1 in the data transmission process can reduce the bit error rate and increase the data transmission capacity.

[0088] S4, the local node forms an available transmission frequency set according to the fusion information;

[0089] The local node forms an available transmission frequency set according to the fusion information, comprising the following steps:

[0090] Obtain frequency points by fusing information;

[0091] According to the availability and quality of the frequency points, the available frequency points are divided into grades to obtain the available frequency points, wherein the available frequency points include an unavailable grade, a minimum rate passable grade, a basic available grade, and a stable available grade;

[0092] The channel quality assessment algorithm is as follows: new frequency point quality = old frequency point quality × 0.4 + 0.6 × this reported quality;

[0093] Get the available transmission frequency set according to the available frequency points.

[0094] S5. The local node obtains communication information, obtains decision information according to the available transmission frequency set, and performs frequency hopping communication according to the decision information and the communication information;

[0095] Among them, frequency hopping communication, namely FH-OFDM adaptive frequency hopping technology, can effectively combat interference between signal waveforms and is suitable for high-speed data transmission in multipath environments and fading channels. When frequency selective fading occurs in the channel due to multipath transmission, only the subcarriers falling in the frequency band depression and the information they carry are affected, while other subcarriers are not damaged, so the system's overall bit error rate performance is better.

[0096] The local node acquires communication information, acquires decision information according to the available transmission frequency set, and performs frequency hopping communication according to the decision information and the communication information, including the following steps:

[0097] The local node obtains communication information;

[0098] Obtaining decision information based on a set of available transmission frequencies;

[0099] The premise for obtaining the decision information is that the frequency change is considered only when the current frequency is unavailable or the current frequency is available at the lowest rate.

[0100] In the decision information, the frequency point takes effect after 2×N subframes, where N is the number of nodes on the network, ensuring that each node can receive the decision information once in theory.

[0101] Acquire radio frequency according to decision information;

[0102] The decision information and communication information are radio-processed according to the radio frequency and sent to neighboring nodes;

[0103] The neighbor node demodulates, obtains the returned communication information, obtains the radio frequency according to the decision information, and sends the returned communication information to the local node.

[0104] The obtaining of the radio frequency according to the decision information comprises the following steps:

[0105] Set the frequency hopping frequency table;

[0106] Acquire a frequency hopping sequence according to the decision information;

[0107] The frequency hopping sequence and the frequency hopping frequency table are combined through the frequency hopping modulator to obtain the radio frequency frequency.

[0108] S6. Repeat steps S1-S5 until the communication is completed.

[0109] Since the environment is constantly changing, the quality of the channel, that is, the availability of different communication signal frequencies, is also changing. Therefore, before the end of the communication, it is necessary to repeat steps S1 to S5, continuously judge the signal frequency availability, and communicate by changing the communication frequency through frequency hopping to achieve high-quality, anti-interference, and high-speed communication.

[0110] The termination of communication specifically refers to: manually shutting down the communication system and ending the communication.

[0111] A high-speed anti-interference communication system combining FCS and FH-OFDM, realizing the above-mentioned high-speed anti-interference communication method, comprises a local node and a neighboring node;

[0112] The local node is used as the main body of the communication system to communicate with neighboring nodes;

[0113] The neighbor node is used to assist the local node in acquiring the available transmission frequency set and decision information, and communicate with the local node;

[0114] Among them, the neighbor node and the local node have the same structure and can be interchanged, with the neighbor node as the main body of the communication system. At the same time, multiple neighbor nodes can be set to perform multi-node communication.

[0115] The local node or neighboring node includes a main control module, an FCS module, an FCS interaction channel, a fixed TDMA control channel and a frequency hopping modulator;

[0116] The main control module is used to configure the FCS frequency table;

[0117] The FCS module is used to configure an active sensing frequency set and a broadcast frequency set;

[0118] The MAC layer is used to perform channel sensing, obtain frequency sensing results, and send detection messages;

[0119] The FCS interaction channel is used to transmit detection messages and fusion information;

[0120] The fixed TDMA control channel is used to transmit fusion information;

[0121] The frequency hopping modulator is used to implement frequency hopping communication.

[0122] The local node or neighboring node further includes: an information modulator, a frequency hopping demodulator, and an information demodulator;

[0123] The information modulator is used to transmit the communication information to the frequency hopping modulator and obtain the frequency hopping sequence according to the decision information;

[0124] The frequency hopping demodulator is used to demodulate frequency hopping communication, complete frequency hopping synchronization, and obtain communication information and decision information;

[0125] The information demodulator is used to demodulate the communication information received by the frequency hopping demodulator, and obtain the frequency hopping sequence according to the received decision information.

[0126] The present invention detects the interference frequency points in the environment through spectrum detection, that is, obtains the frequency perception results, collects the communication quality at each frequency point, and informs the neighboring nodes of the local node detection message reception quality through channel perception feedback interaction;

[0127] like Figure 5 As shown, the local node is informed of the automatically sensed frequency quality, and the optimal frequency information is selected based on the available time slots reported by the neighbors and sent to the frequency hopping sequence generator to generate a random or pseudo-random multi-value sequence. The frequency synthesizer generates the required frequency under the control of the sequence, and the frequency hopping synchronizer is used to control the hopping of the receiver's local oscillator frequency to synchronize it with the carrier frequency hopping of the transmitter.

[0128] The present invention uses frequency hopping technology to perform wireless communication, has strong anti-interference ability, can effectively combat the multipath effect of transmission in complex environments, and provide the system with high-reliability transmission performance and higher transmission capacity; through FCS, frequency sensing is performed in idle time slots, and before communication link establishment and before communication data is sent during communication link establishment, the frequency points with severe interference are removed, thereby further reducing the communication bit error rate and improving the anti-interference and data transmission capabilities of the communication system.

Claims

1. A high-speed anti-interference communication method combining FCS and FH-OFDM, characterized in that: The following steps are involved: S1. The local node performs channel sensing through the FCS module to obtain the local frequency sensing result; S2: The local node converts the local frequency sensing result into a detection message and transmits the detection message to the neighboring node through the FCS interaction channel; S3, the neighboring node performs fusion analysis on the received detection message, obtains fusion information, and transmits the fusion information to the local node; S4, the local node forms an available transmission frequency set according to the fusion information; S5. The local node obtains communication information, obtains decision information according to the available transmission frequency set, and performs frequency hopping communication according to the decision information and the communication information; S6. Repeat steps S1-S5 until the communication is completed.

2. The high-speed anti-interference communication method according to claim 1, characterized in that: The channel sensing by the FCS module comprises the following steps: The main control module is configured with FCS frequency table; The FCS module obtains the current frame structure design of the MAC layer, and configures the active sensing frequency set according to the FCS frequency table and the current frame structure design of the MAC layer; The MAC layer performs channel sensing based on the active sensing frequency set to obtain frequency sensing results.

3. The high-speed anti-interference communication method according to claim 1, characterized in that: The sending of the detection message to the neighbor node through the FCS interaction channel comprises the following steps: The main control module is configured with FCS frequency table; The FCS module obtains the current frame structure design of the MAC layer, configures the broadcast frequency set according to the FCS frequency table and the current frame structure design of the MAC layer, and obtains the FCS interaction channel according to the broadcast frequency set; The MAC layer sends the detection message to the neighbor node through the FCS interaction channel.

4. The high-speed anti-interference communication method according to claim 1, characterized in that: The neighbor node performs fusion analysis on the received detection message, and obtaining fusion information includes the following steps: Neighboring nodes perform channel sensing through FCS and obtain neighbor frequency sensing results; The neighbor node integrates and analyzes the neighbor frequency perception results and the detection message to obtain integrated information.

5. The high-speed anti-interference communication method according to claim 1, characterized in that: The transmitting the fused information to the local node specifically refers to: transmitting the fused information to the local node through the FCS interaction channel and the fixed TDMA control channel.

6. The high-speed anti-interference communication method according to claim 1, characterized in that: The local node forms an available transmission frequency set according to the fusion information, comprising the following steps: Obtain frequency points by fusing information; According to the availability and quality of the frequency points, the available frequency points are divided into grades to obtain the available frequency points, wherein the available frequency points include an unavailable grade, a minimum rate passable grade, a basic available grade, and a stable available grade; Get the available transmission frequency set according to the available frequency points.

7. The high-speed anti-interference communication method according to claim 1, characterized in that: The local node acquires communication information, acquires decision information according to the available transmission frequency set, and performs frequency hopping communication according to the decision information and the communication information, including the following steps: The local node obtains communication information; Obtaining decision information based on a set of available transmission frequencies; obtaining a radio frequency frequency according to the decision information; The decision information and communication information are radio-processed according to the radio frequency and sent to neighboring nodes; The neighboring node demodulates, obtains the returned communication information, obtains the radio frequency according to the decision information, and sends the returned communication information to the local node.

8. The high-speed anti-interference communication method according to claim 7, characterized in that: The obtaining of the radio frequency according to the decision information comprises the following steps: Set the frequency hopping frequency table; Acquire a frequency hopping sequence according to the decision information; The frequency hopping sequence and the frequency hopping frequency table are combined through the frequency hopping modulator to obtain the radio frequency frequency.

9. A high-speed anti-interference communication system combining FCS and FH-OFDM, characterized in that: Implementing the high-speed anti-interference communication method described in any one of claims 1 to 8, comprising a local node and a neighboring node; The local node is used as the main body of the communication system to communicate with neighboring nodes; The neighbor node is used to assist the local node in acquiring the available transmission frequency set and decision information, and communicate with the local node; The local node or neighboring node includes a main control module, an FCS module, a MAC layer, an FCS interaction channel, a fixed TDMA control channel and a frequency hopping modulator; The main control module is used to configure the FCS frequency table; The FCS module is used to configure an active sensing frequency set and a broadcast frequency set; The MAC layer is used to perform channel sensing, obtain frequency sensing results, and send detection messages; The FCS interaction channel is used to transmit detection messages and fusion information; The fixed TDMA control channel is used to transmit fusion information; The frequency hopping modulator is used to implement frequency hopping communication.

10. The high-speed anti-interference communication system according to claim 9, characterized in that: The local node or neighboring node further includes: an information modulator, a frequency hopping demodulator, and an information demodulator; The information modulator is used to transmit the communication information to the frequency hopping modulator and obtain the frequency hopping sequence according to the decision information; The frequency hopping demodulator is used to demodulate frequency hopping communication, complete frequency hopping synchronization, and obtain communication information and decision information; The information demodulator is used to demodulate the communication information received by the frequency hopping demodulator, and obtain the frequency hopping sequence according to the received decision information.

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