Wireless communication device and wireless communication system

Abstract

To avoid the effects of interference and build a stable network.SOLUTION: A wireless communication device includes a transmission processing unit that monitors the communication quality of a propagation path of a subcarrier group of a received signal and generates a transmission signal by adding interference information indicating a subcarrier group in which interference has been detected, making it difficult to build a network, a high-frequency unit that transmits the generated transmission signal from an antenna, and a reception processing unit that extracts information on the subcarrier group in which interference has been detected in the transmitting wireless communication device from the interference information added to the signal transmitted from the transmitting wireless communication device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wireless communication device used in a wireless communication system performing N-to-N data transmission between a plurality of nodes whose communication partners are predetermined, and a control method thereof. [Background technology]

[0002] In conventional wireless communication, the Carrier Sense Multiple Access / Collision Avoidance (CSMA / CA) method is an access technology that allows multiple wireless stations to share the same wireless channel for communication. In the CSMA / CA method, each station monitors the usage status of the wireless channel and autonomously determines the timing of packet (frame) transmission, and is used in wireless LANs that adopt IEEE802.11. In addition, there are wireless communication systems (e.g., maritime mobile systems) that employ ad-hoc communication without installing a base station. In an ad-hoc wireless communication system, an access method such as the CSMA / CA method is used to build an ad-hoc network between wireless stations for communication, allowing communication without relying on base stations or access points.

[0003] These wireless communication systems use OFDM (Orthogonal Frequency-Division Multiplexing), a multi-carrier modulation method that transmits data using multiple orthogonal subcarriers, dividing the frequency band into multiple subcarrier groups (subchannels) consisting of multiple orthogonal subcarriers, and assigning data to the subcarrier groups for transmission. This allows data to be distributed and transmitted across multiple subcarriers, reducing the probability of data loss due to frequency selective fading caused by multipath.

[0004] Background art in this technical field includes Patent Document 1 (International Publication No. 2021 / 024353) and Patent Document 2 (JP Patent Publication No. 2012-49983).

[0005] Patent Document 1 describes a wireless device that divides a given frequency band into a plurality of subcarrier groups consisting of a plurality of orthogonal subcarriers, and assigns data to the subcarrier groups for transmission, the wireless device comprising: communication quality detection means for detecting the communication quality of each of the plurality of subcarriers; status notification screen generation means for generating a subcarrier status notification screen that notifies a list of the communication qualities of the plurality of subcarriers detected by the communication quality detection means in a state in which the subcarrier group to which it belongs can be identified, and for generating a use instruction screen that instructs use / non-use of the subcarrier group, and for displaying the subcarrier status notification screen and the use instruction screen on a single screen on a display means; input means for receiving an instruction to use / non-use the subcarrier group based on the use instruction screen displayed on the display means; and group control means for setting a used subcarrier group to be used for data transmission and an unused subcarrier group not to be used for data transmission based on the instruction to use / non-use of the subcarrier group received by the input means, and the wireless device is characterized in that it assigns data to the used subcarrier group set by the carrier control means for transmission.

[0006] Patent Document 2 describes a communication device that establishes a wireless ad-hoc network and communicates, and when the communication device is mounted on a rotorcraft, the communication device includes an initial diagnosis unit that calculates an expected line error rate based on the performance and installation status of the device itself, a link effective time calculation unit that calculates an adjustment value to adjust a link maintenance time in two-way communication based on the expected line error rate, a message analysis and correction unit that corrects information about the link maintenance time in a control message based on the adjustment value, and a radio link control unit that receives the corrected control message and processes it for transmission or reception. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2021 / 024353 [Patent Document 2] JP 2012-49983 A Summary of the Invention [Problem to be solved by the invention]

[0008] The subcarrier group setting method of a wireless device described in Patent Document 1 sets whether to use subcarriers in the data portion when interference occurs, but does not set whether to use subcarriers in the preamble portion dedicated to synchronization processing, and does not take into consideration the effect of interference on synchronization processing. In wireless devices and wireless communication systems that transmit and receive using an ad-hoc routing protocol, control messages (Hello messages, etc.) for determining a route are constantly transmitted and received, and if the preamble portion included in this control message is affected by frequency selective fading due to multipath when moving over the sea, the link (route determination) operation becomes unstable, and data transmission becomes impossible.

[0009] As a practical example of wireless communication equipment, there is a method in which the subcarriers in the preamble part of both the local and remote stations are set to half and synchronization is performed using subcarriers that are not affected by interference waves (see Fig. 3).

[0010] However, in the method of setting the subcarriers of the preamble portion for synchronization processing to half in the above-mentioned operation example of the wireless communication device, the position of the interference wave must be shared in advance between the local station and the remote station, and the subcarriers are controlled manually by the user. Therefore, in the case of unpredictable deterioration of the propagation path quality such as interference waves, the position of the interference wave cannot be shared in advance, so the preamble portion is affected by the interference wave, the link operation becomes unstable, the route cannot be determined, and it may be difficult to build an ad-hoc network. Essentially, it is desirable for the local station and the remote station to share information on the propagation path such as interference waves, and automatically control the subcarriers of the preamble portion to avoid interference.

[0011] Furthermore, by setting the subcarriers in the preamble portion to half, the bandwidth used for communication is halved, and the communication distance is shortened.

[0012] Furthermore, in the conventional technology described above, the user must determine the communication quality of the propagation path and set the subcarrier group for the data portion by himself / herself. In a wireless communication system performing N-to-N data transmission between multiple nodes, it is difficult to deal with deterioration of the fluctuating propagation path quality, so there is a problem that packet loss occurs in data subcarriers affected by interference waves, resulting in a decrease in transmission volume.

[0013] The present invention has been made in view of the above circumstances, and has an object to solve the above-mentioned problems. [Means for solving the problem]

[0014] A representative example of the invention disclosed in this application is as follows: That is, a wireless communication device is characterized by having a transmission processing unit that monitors the communication quality of a propagation path of a subcarrier group of a received signal, and generates a transmission signal by adding interference information indicating a subcarrier group in which interference that makes it difficult to build a network has been detected, a high frequency unit that transmits the generated transmission signal from an antenna, and a reception processing unit that extracts information on the subcarrier group in which interference has been detected by the transmitting wireless communication device from the interference information added to the signal transmitted from the transmitting wireless communication device.

[0015] In addition, in one example of a wireless communication device of the present invention, the transmitting processing unit does not insert a predetermined synchronization pattern into the preamble portion of a subcarrier group where interference is detected, making it difficult to construct a network, and the receiving processing unit establishes synchronization using a portion of the preamble portion of the signal transmitted from the transmitting wireless communication device where the predetermined synchronization pattern is inserted.

[0016] In addition, in a wireless communication device according to one example of the present invention, the transmission processing unit is characterized in that it adds shared control information including a modulation method, a bandwidth, a frequency, and a frame length, which are parameters for controlling communication, to the signal to be transmitted.

[0017] Moreover, a wireless communication system according to an example of the present invention includes a first wireless communication device and a second wireless communication device which are communication partners, the first wireless communication device monitors the communication quality of the propagation path of a subcarrier group of a received signal, and transmits a signal by adding interference information indicating a subcarrier group in which interference has been detected making it difficult to build a network, and the second wireless communication device shares information on the subcarrier group in which interference has been detected by the first wireless communication device from the interference information added to the signal transmitted from the first wireless communication device.

[0018] In addition, in a wireless communication system according to an example of the present invention, the first wireless communication device and the second wireless communication device establish synchronization using a predetermined synchronization pattern to configure an ad-hoc network. Effect of the Invention

[0019] According to one aspect of the present invention, it is possible to avoid the influence of interference waves and to stably build a network. Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a block diagram showing a configuration of a node according to an embodiment of the present invention. [Diagram 2] FIG. 1 is a diagram showing an example of an environment in which interference occurs in a wireless communication system that performs N-to-N transmission and reception using an ad-hoc routing protocol. [Diagram 3] FIG. 1 is a diagram showing an example of an environment in which interference occurs in a wireless communication system that performs N-to-N transmission and reception using an ad-hoc routing protocol. [Figure 4]FIG. 1 is a diagram showing an example of an environment in which interference occurs when the present invention is applied to a wireless communication system that performs N-to-N transmission and reception using an ad-hoc routing protocol. [Diagram 5] 1 is a diagram illustrating an example of a frame format used in the wireless communication system of the present embodiment. [Figure 6] FIG. 13 is a diagram showing an example of the format of a header portion (b) in the present embodiment. [Figure 7] 11 is a flowchart of a receiving process according to the embodiment. [Figure 8] 11 is a flowchart of a transmission process according to the present embodiment. [Figure 9] FIG. 13 is a diagram showing an example of the configuration of an optimal value table according to interference information in the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0022] The wireless communication system according to the embodiment of the present invention has a function of detecting the communication quality of the propagation path of the subcarrier group of the received signal of the own station, and switching the synchronization pattern of the preamble part of the subcarrier transmitted by the own station, the shared control information of the header part, and the subcarrier group of the data part to optimal values ​​when it is determined that the interference is caused by interference waves and that an ad-hoc network cannot be established. As shown in FIG. 9, the optimal values ​​are stored in a table, and the synchronization pattern of the preamble part, the shared control information of the header part, and the subcarrier group of the data part according to the interference information may be registered. Even if the synchronization pattern of the preamble part of the received subcarrier changes, the other station has a circuit that can follow and recognize it, so that it can detect the position of the interference wave, and has a function of reflecting the detection result in the transmission process and avoiding the influence of the interference wave at both the own station and the other station to establish an ad-hoc network. In this way, since both the own station and the other station can share the change in the propagation path quality such as interference waves, it is possible to establish an ad-hoc network and transmit data while avoiding the influence of interference waves in real time.

[0023] FIG. 1 is a block diagram showing the configuration of a node according to an embodiment of the present invention.

[0024] A node included in the wireless communication system of this embodiment is a wireless communication device that wirelessly communicates with other nodes, and includes a transmission processing unit 101, a reception processing unit 102, a transmission parameter control unit 103, and an RF unit 104.

[0025] The transmission processing unit 101 has a header generation unit 105, an encoding unit 106, a subcarrier control unit 107, a mapping unit 108, a pilot insertion unit 109, a preamble insertion unit 110, an IFFT unit 111, and a transmission rate conversion unit 112, and outputs a baseband signal (OFDM symbol) generated from the input transmission data, which is digital data, to the RF unit 104.

[0026] The reception processing unit 102 has a reception rate conversion unit 113, a synchronization unit 114, an FFT unit 115, a preamble correlation unit 116, a phase rotation correction unit 117, a channel estimation / equalization unit 118, a demapping unit 119, a decoding unit 120, and a header analysis unit 121, and converts the baseband signal (OFDM symbol) output from the RF unit 104 into reception data, which is digital data, and outputs it.

[0027] The transmission parameter control section 103 includes an interfering subcarrier determining section 122 , a parameter selecting section 123 , a storage section 124 , an input section 125 , and a display section 126 .

[0028] The transmission data, which is digital data input to the transmission processing unit 101, is input to the header generation unit 105. The header generation unit 105 generates a header from the modulation method, bandwidth information, frequency information, frame length, interference subcarrier group information, and interference detection presence / absence information provided by the transmission parameter control unit 103. The generated header and transmission data are coded by the coding unit 106. The subcarrier control unit 107 selects whether to use each of the data subcarriers based on the interference subcarrier group information provided by the transmission parameter control unit 103. Transmission data is placed in the subcarrier group to be used, and null data is placed in the subcarrier group not to be used. The mapping unit 108 performs mapping processing of the data symbols to be assigned to the subcarriers. The pilot insertion unit 109 inserts pilot symbols between the data symbols. The inserted pilot symbols are used for receiving channel estimation. Pilot symbols are not inserted in the subcarrier groups not to be used based on the interference subcarrier group information provided by the transmission parameter control unit 103. The preamble inserting unit 110 inserts a fixed pattern used for detecting the data head position in the preamble correlating unit 116 of the receiving processing unit 102. The fixed pattern is not inserted into the subcarrier group that is determined to be unused from the interference subcarrier group information provided by the transmission parameter control unit 103. The fixed pattern is stored in the storage unit 124 configured by a non-volatile storage device such as a hard disk, and can be read by the preamble inserting unit 110 in real time. The IFFT unit 111 converts each symbol arranged in the frequency direction into a time domain signal, and generates an OFDM symbol having a fixed time length. The transmission rate conversion unit 112 converts the sampling rate in accordance with the digital-to-analog converter, converts the digital signal to an analog signal by the digital-to-analog converter, and outputs it to the RF unit 104.

[0029] The RF unit 104 is connected to an antenna unit 127, converts the OFDM symbols generated by the transmission parameter control unit 103 into a high-frequency signal, and transmits it from the antenna unit 127 to a wireless transmission path.

[0030] A high frequency signal transmitted from a remote station is received by the antenna section 127, converted into a baseband OFDM symbol by the RF section 104, and input to the reception processing section .

[0031] The reception rate conversion unit 113 converts the sampling rate in accordance with the analog-digital converter, converts the analog signal to a digital signal by the analog-digital converter, and outputs the digital signal to the synchronization unit 114. The synchronization unit 114 performs correlation processing of the OFDM symbols to detect the beginning of the symbol. The FFT unit 115 converts each symbol arranged in the time direction into a frequency domain signal. The preamble correlation unit 116 detects the beginning of the data symbol using a known fixed preamble pattern. The preamble correlation unit 116 arranges matched filters for correlation detection in parallel and can detect correlation with each fixed pattern. The presence or absence of a subcarrier group in which a fixed pattern is not inserted (whether the other station is being disturbed or not) can be determined based on the correlation result of the matched filter. If it is determined that the other station is being disturbed, the transmission parameter control unit 103 is notified of disturbing subcarrier group information. This notification enables the local station to set the same transmission parameters for interference avoidance as the other station, and to perform transmission processing using the transmission parameters. The phase rotation correction unit 117 calculates the amount of rotation per OFDM and performs correction processing. The channel estimation / equalization unit 118 detects and compensates for equalization errors (such as attenuation and phase rotation) incurred in the transmission path by interpolation using pilot symbols. The channel estimation / equalization unit 118 notifies the result of the equalization error to the interference subcarrier determination unit 122. The demapping unit 119 executes demapping processing, and the decoding unit 120 executes decoding processing. The header analysis unit 121 analyzes the demodulated header portion, and obtains the modulation method, bandwidth information, frequency information, frame length, interference subcarrier group information, and interference detection presence / absence information of the remote station, and can share this information with the remote station. The header analysis unit 121 outputs the data portion as digital received data.

[0032] The transmission parameter control section 103 receives as input the result of the equalization error detected in the channel estimation / equalization section 118 of the reception processing section 102 and the interference subcarrier group information detected in the preamble correlation section 116 .

[0033] The equalization error is a value calculated based on the transmission path state estimated for each subcarrier. The interference subcarrier determination unit 122 detects a subcarrier exceeding a set interference threshold as an interference subcarrier based on the equalization error. The detection method may be to determine a subcarrier as an interference subcarrier when a preset number of times is exceeded or when an averaged result exceeds a predetermined threshold. The parameter selection unit 123 determines a subcarrier group to which the detected interference subcarrier belongs, and notifies the transmission processing unit 101. The parameter selection unit 123 also notifies the transmission processing unit 101 of interference subcarrier group information detected by the preamble correlation unit 116. The parameter selection unit 123 also notifies the transmission processing unit 101 of parameters (modulation method, bandwidth information, frequency information, frame length, etc.) set by the input unit 125, regardless of the presence or absence of interference. The input unit 125 is composed of a keyboard, a mouse, etc., and provides an input function using a GUI. The display unit 126 displays the interference subcarrier in a different manner from other subcarriers using graphics. The display unit 126 also displays interference subcarrier group information in a distinguishable manner. For example, if there are a total of 840 subcarriers, with 7 subcarriers per group, they are divided into 120 subcarrier groups. The display unit 126 is configured with a display device such as a liquid crystal display, and provides a GUI function for the user and a display function for reporting setting information. For example, the display unit 126 may display a status notification screen in which the horizontal axis represents the subcarrier group number and the vertical axis represents the communication quality (e.g., reception level) of the subcarrier group in a graph. Also, an instruction screen may be displayed that allows the user to select the communication quality of the subcarriers belonging to the subcarrier group and whether or not to use the subcarrier group.

[0034] 2 and 3 are diagrams showing examples of environments in which interference occurs in a wireless communication system that performs N-to-N transmission and reception using an ad-hoc routing protocol.

[0035] As shown in Figure 2, when node (a) is affected by interference, the preamble portion included in the control message (such as a Hello message) for determining the route is affected by the interference, causing the link operation for determining the communication route to become unstable, making data transmission to nodes (b) and (c) difficult.

[0036] As shown in Figure 3, when node (a) is affected by interference, node (a) manually sets the preamble portion included in the control message (such as a Hello message) for determining the route to half the frequency band. Nodes (b) and (c) also manually set the preamble portion to half the frequency band in the same way. As a result, the preamble portion used for synchronization processing will use half the frequency band, which may reduce the communication range and cause the link operation to become unstable.

[0037] FIG. 4 is a diagram showing an example of an environment in which interference occurs when the present invention is applied to a wireless communication system that performs N-to-N transmission and reception using an ad-hoc routing protocol.

[0038] When node (a) is affected by interference, it switches the synchronization pattern in the preamble it transmits to the optimal value. Nodes (b) and (c) can detect the correlation of all synchronization patterns using matched filters arranged in parallel, and can stably maintain the ad-hoc network even when affected by interference.

[0039] FIG. 5 is a diagram showing an example of a frame format used in the wireless communication system of this embodiment.

[0040] One OFDM frame is divided into a preamble portion (a), a header portion (b), and a data portion (c), and the data portion (c) has a variable length depending on the data length.

[0041] FIG. 6 is a diagram showing an example of the format of the header portion (b) in this embodiment.

[0042] The header portion (b) indicates packet information including parameters shared between nodes to control communication, and is placed before the data frame to be transmitted. It stores modulation method, bandwidth information, frequency information, frame length, interference subcarrier group information, etc.

[0043] The interfering subcarrier group information is divided into, for example, No1 to No120 so that the position of interference can be determined for each subcarrier group, and has 120 bits of information. A "1" is stored in the bit corresponding to an interfering subcarrier group determined to have interference, and a "0" is stored in the bit corresponding to an interfering subcarrier group determined not to have interference. Since the number of bits of the interfering subcarrier group information increases when interference is determined for each subcarrier, it is advisable to reduce the amount of data of the interfering subcarrier group information by determining for each subcarrier group that bundles multiple subcarriers. In the figure, interference is shown to occur at the positions of subcarrier groups No3 and No4.

[0044] FIG. 7 is a flowchart of the reception process of this embodiment.

[0045] The presence or absence of interference may be determined at two locations in the reception processing unit 102: the preamble correlation unit 116 and the channel estimation / equalization unit 118 .

[0046] The preamble correlation unit 116 detects correlation with the preamble of the fixed pattern using multiple matched filters (S11). Specifically, if there is a subcarrier group that is being disturbed in the remote station (transmitting side), the fixed pattern used for synchronization processing (detection of the data start position) is not inserted into that subcarrier group for transmission. Since the receiving side has multiple correlation filters, it can know the fixed pattern insertion position of the subcarrier group from the correlation filter with which synchronization is established, and can identify the position where synchronization is not established as the position where the remote station is being disturbed. When the preamble correlation unit 116 detects disturbance in the synchronization pattern, it determines which of the previously classified disturbance patterns it corresponds to.

[0047] The channel estimation and equalization unit 118 determines that a subcarrier in which an equalization error caused by interference received on the transmission path, derived by interpolation using pilot symbols, exceeds a preset threshold, is interfered with (S12). When interference is detected in a subcarrier, the channel estimation and equalization unit 118 determines which of the interference patterns classified in advance it corresponds to. By detecting interference at these two points, it is possible to detect both interference information detected before the remote station transmits and interference information on the transmission path in real time.

[0048] When the preamble correlation unit 116 and the channel estimation and equalization unit 118 detect interference, they notify the transmission processing unit 101 of information on the interference subcarrier group (S13).

[0049] FIG. 8 is a flowchart of the transmission process of this embodiment.

[0050] If interference is detected by the preamble correlation unit 116 and the channel estimation and equalization unit 118 (Y in S21), the detected 120-bit interference subcarrier group information is input to an interference subcarrier determination unit 122 in the transmission parameter control unit 103.

[0051] The interfering subcarrier determining unit 122 adds the two pieces of interfering subcarrier group information for each bit.

[0052] The parameter selection unit 123 determines the parameters to be used in the transmission process by excluding the subcarrier groups that are being interfered with, as indicated by the interfering subcarrier group information (interference information from the other station) input from the interfering subcarrier determination unit 122, from each parameter (modulation method, bandwidth information, frequency information, frame length, interfering subcarrier group information, etc.) set in the input unit 125.

[0053] The parameter selection unit 123 outputs transmission parameters such as modulation method, bandwidth information, frequency information, frame length, and interfering subcarrier group information to the header generation unit 105, and outputs 120-bit interfering subcarrier group information to the subcarrier control unit 107, the pilot insertion unit 109, and the preamble insertion unit 110.

[0054] When the transmission processing unit 101 receives the parameters from the parameter selection unit 123, the transmission processing unit 101 refers to an optimum value table according to the interference information using the interference pattern, and acquires an optimum pattern of the synchronization pattern of the preamble part, an optimum value of the shared control information of the header part, and an optimum value of the subcarrier group information of the data part. Then, the synchronization pattern of the preamble part is switched to the optimum pattern, the shared control information of the header part is switched to the optimum value, and the subcarrier group information of the data part is switched to the optimum value. For example, the header generation unit 105 sets the interference information at the bit position of the subcarrier group where interference is detected based on the interference subcarrier group information. Different identification information may be set in the interference information depending on the interference pattern. The subcarrier control unit 107 places null data on the subcarriers that are being interfered with based on the interference subcarrier group information (i.e., does not place data on the frequency axis). The pilot insertion unit 109 does not insert pilot symbols into the subcarriers that are being interfered with based on the interference subcarrier group information. The preamble insertion unit 110 does not insert a fixed preamble pattern into the subcarriers that are being interfered with based on the interference subcarrier group information.

[0055] As shown in Fig. 9, the optimum value of the synchronization pattern of the preamble portion, the optimum value of the synchronization pattern of the header portion, and the optimum value of the subcarrier group of the data portion are determined in advance. These optimum values ​​are preferably determined in advance for each interference pattern and for the presence or absence of interference.

[0056] As described above, the wireless communication system according to the embodiment of the present invention can share the positions of subcarriers that are being disturbed by the opposing wireless communication device in real time, so that the preamble portion can be selected so that the subcarriers that are being disturbed are not used, and synchronization can be established while avoiding the influence of the disturbance wave, so that the ad-hoc network can be stably constructed. In addition, since the positions of the subcarriers that are being disturbed can be shared in real time, the preamble portion and data portion that are not used can be set, and the decrease in communication distance and data transmission amount due to the influence of the disturbance wave can be suppressed.

[0057] The present invention is not limited to the above-described embodiments, and includes various modified examples and equivalent configurations within the spirit of the appended claims. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the configurations described. Furthermore, a part of the configuration of one embodiment may be replaced with the configuration of another embodiment. Furthermore, the configuration of another embodiment may be added to the configuration of one embodiment. Furthermore, a part of the configuration of each embodiment may be added, deleted, or replaced with another configuration.

[0058] Furthermore, each of the aforementioned configurations, functions, processing units, processing means, etc. may be realized in hardware, for example by designing some or all of them as an integrated circuit, or may be realized in software by a processor interpreting and executing a program that realizes each function.

[0059] Information such as programs, tables, and files that realize each function can be stored in a storage device such as a memory, a hard disk, or an SSD (Solid State Drive), or in a recording medium such as an IC card, an SD card, or a DVD.

[0060] In addition, the control lines and information lines shown are those considered necessary for the explanation, and do not necessarily show all the control lines and information lines necessary for implementation. In reality, it can be considered that almost all components are connected to each other. [Explanation of symbols]

[0061] 101 Transmission processing unit 102 Receiving processing unit 103 Transmission parameter control section 104 RF section 105 Header Generation Unit 106 Encoding section 107 Subcarrier control section 108 Mapping section 109 Pilot Insertion Part 110 Preamble Insertion Section 111 IFFT section 112 Transmission rate conversion unit 113 Reception rate conversion unit 114 Synchronization section 115 FFT section 116 Preamble correlation part 117 Phase rotation correction unit 118 Channel Estimation and Equalization Unit 119 Demapping section 120 Decoding section 121 Header parser 122 Interference subcarrier determination unit 123 Parameter Selection Section 124 Storage section 125 Input section 126 Display section 127 Antenna Section

Claims

1. 1. A wireless communication device, comprising: a transmission processing unit that monitors communication quality of a propagation path of a subcarrier group of a received signal, and generates a transmission signal by adding interference information indicating a subcarrier group in which interference that makes it difficult to construct a network has been detected; a high frequency unit that transmits the generated transmission signal from an antenna; A wireless communication device characterized by having a receiving processing unit that extracts information of a subcarrier group in which interference has been detected by a transmitting wireless communication device from interference information added to a signal transmitted from the transmitting wireless communication device.

2. 2. The wireless communication device according to claim 1, The transmission processing unit does not insert a predetermined synchronization pattern into a preamble portion of a subcarrier group in which interference that makes it difficult to construct a network is detected, The wireless communication device, wherein the reception processing unit establishes synchronization using a portion of a preamble portion of a signal transmitted from the transmitting wireless communication device, in which a predetermined synchronization pattern is inserted.

3. 2. The wireless communication device according to claim 1, The wireless communication device, wherein the transmission processing unit adds shared control information including a modulation method, a bandwidth, a frequency, and a frame length, which are parameters for controlling communication, to a signal to be transmitted.

4. 1. A wireless communication system, comprising: The present invention provides a wireless communication system including a first wireless communication device and a second wireless communication device which are communication partners; the first wireless communication device monitors communication quality of a propagation path of a subcarrier group of a received signal, and transmits a signal by adding interference information indicating a subcarrier group in which interference that makes it difficult to construct a network has been detected; A wireless communication system characterized in that the second wireless communication device shares information about a subcarrier group in which interference was detected by the first wireless communication device from interference information added to a signal transmitted from the first wireless communication device.

5. 5. The wireless communication system according to claim 4, A wireless communication system, characterized in that the first wireless communication device and the second wireless communication device establish synchronization using a predetermined synchronization pattern to form an ad-hoc network.

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