Wireless communication device, wireless communication method, and wireless communication program

Abstract

To provide a wireless communication device, a wireless communication method, and a wireless communication program that can improve accuracy in detecting unwanted signals not required for wireless communication.SOLUTION: In a wireless communication device, a receiving unit performs a receiving process to receive a desired signal, which is a signal necessary for communication, on an input signal that is input, a generating unit generates a frequency spectrum of the input signal that is input, a determining unit determines whether or not a spreading code used in the receiving process in receiving a signal spread by a spectrum spreading method can be synchronized with respect to the input signal, and an output unit outputs the frequency spectrum and a determination result as to whether or not synchronization is possible.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a wireless communication device, a wireless communication method, and a wireless communication program. [Background technology]

[0002] In recent years, the use of artificial satellites has expanded, and the number of satellites launched by each country has increased due to large-scale LEO (Low Earth Orbit) constellations by private companies. As the number of satellites in operation increases, interference with satellite communications has become a problem. For example, communications by a certain satellite may be interfered with by signals transmitted by satellites around that satellite, or by signals from ground stations operating the surrounding satellites. There are also cases where jamming signals are intentionally transmitted with the aim of disrupting satellite communications.

[0003] As a result, the radio communication environment in satellite orbit is deteriorating, and there is a demand for communication devices (such as transponders) onboard satellites to detect signals unnecessary for communication and take measures to prevent such signals.

[0004] In the following description, a signal that is not necessary for communication by a communication device is called an unwanted signal. An unwanted signal may be an interference signal that interferes with communication by a communication device. A signal that is necessary for communication by a communication device is called a desired signal.

[0005] One method of detecting unwanted signals is, for example, to perform frequency spectrum analysis on the frequency band used by a communication device for communication, and to distinguish between desired and unwanted signals. The frequency spectrum analysis distinguishes between desired and unwanted signals, for example, by analyzing the shape and time transition of the frequency spectrum (such as the movement pattern and frequency of occurrence of the frequencies that appear).

[0006] A related technique is described in Patent Document 1. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 3387459 Summary of the Invention [Problem to be solved by the invention]

[0008] The method of identifying unwanted signals by frequency spectrum analysis is effective for signals with a relatively narrow frequency band and large transmission energy per band. However, this method has difficulty in identifying desired signals from unwanted signals, particularly for signals that are distributed over a wide band and have low energy per band, such as signals using a spread spectrum communication method. Therefore, there is a possibility that the desired signal will also be determined to be an unwanted signal.

[0009] In view of the above-mentioned problems, an object of the present disclosure is to provide a wireless communication device, a wireless communication system, a wireless communication method, and a wireless communication program that enable improved detection accuracy of unnecessary signals not required for wireless communication. [Means for solving the problem]

[0010] In one aspect of the present disclosure, a wireless communication device includes a receiving unit that performs receiving processing for an input signal to receive a desired signal, which is a signal necessary for communication, a generating unit that generates a frequency spectrum of the input signal, a determining unit that determines whether a spreading code used in the receiving processing to receive a signal spread by a spectrum spreading method is synchronized with the input signal, and an output unit that outputs the frequency spectrum and a determination result of whether synchronization is possible or not.

[0011] In addition, in another aspect of the present disclosure, a wireless communication method performs a receiving process on an input signal to receive a desired signal, which is a signal necessary for communication, generates a frequency spectrum of the input signal, determines whether a spreading code used in the receiving process to receive a signal spread by a spectrum spreading method is synchronized with the input signal, and outputs the frequency spectrum and a determination result of whether synchronization is possible.

[0012] In another aspect of the present disclosure, a wireless communication program causes a computer to realize a receiving function that performs receiving processing for receiving a desired signal, which is a signal necessary for communication, from an input signal that is input, a generating function that generates a frequency spectrum of the input signal, a determining function that determines whether a spreading code used in the receiving processing for receiving a signal spread by a spectrum spreading method is synchronized with the input signal, and an output function that outputs the frequency spectrum and a determination result of whether synchronization is possible or not. Effect of the Invention

[0013] According to the present disclosure, it is possible to improve the accuracy of detecting unwanted signals that are not required for wireless communication. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication device according to the present disclosure. [Diagram 2] FIG. 2 is a diagram illustrating an example of an operation flow of a wireless communication device according to the present disclosure. [Diagram 3] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication device according to the present disclosure. [Figure 4] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication device according to the present disclosure. [Diagram 5] FIG. 2 is a diagram illustrating an example of an operation flow of a wireless communication device according to the present disclosure. [Figure 6] FIG. 2 is a diagram illustrating an example of a hardware configuration according to each embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] [First embodiment] A first embodiment of the present disclosure will be described.

[0016] A specific example of the wireless communication device 10 in the first embodiment is a wireless communication device 20 in a second embodiment, which will be described later.

[0017] First, a description will be given of an example of the configuration of the wireless communication device 10. Fig. 1 shows an example of the configuration of the wireless communication device 10. The wireless communication device 10 includes a receiving unit 11, a generating unit 12, a determining unit 13, and an output unit 14.

[0018] The receiving unit 11 performs a receiving process for receiving a desired signal from the input signal. The desired signal is a signal necessary for communication.

[0019] The generator 12 generates a frequency spectrum of the input signal.

[0020] The determination unit 13 determines whether or not the spreading code used in the reception process for receiving the signal spread by the spread spectrum method is synchronizable with respect to the input signal.

[0021] The output unit 14 outputs the frequency spectrum and the determination result as to whether or not synchronization is possible.

[0022] Next, a description will be given of an example of an operation flow of the wireless communication device 10. An example of an operation flow of the wireless communication device 10 is shown in FIG.

[0023] The generating unit 12 generates a frequency spectrum of an input signal (step S101).

[0024] The determination unit 13 determines whether or not the spreading code can be synchronized with respect to the input signal (step S102).

[0025] The output unit 14 outputs the frequency spectrum and the determination result as to whether or not synchronization is possible (step S103).

[0026] As described above, in the first embodiment of the present disclosure, the wireless communication device 10 includes a receiving unit 11, a generating unit 12, a determining unit 13, and an output unit 14. The receiving unit 11 performs a receiving process for receiving a desired signal from an input signal that has been input. The desired signal is a signal necessary for communication. The generating unit 12 generates a frequency spectrum of the input signal. The determining unit 13 determines whether or not a spreading code used in the receiving process for receiving a signal spread by a spread spectrum method is synchronizable with the input signal. The output unit 14 outputs the frequency spectrum and a determination result of whether or not synchronization is possible.

[0027] In this way, the wireless communication device 10 judges whether the spreading code can be synchronized with the input signal. This makes it possible to know whether the input signal contains a desired signal, thereby reducing the possibility that the desired signal will be regarded as an unwanted signal. This makes it possible to improve the detection accuracy of unwanted signals that are not required for wireless communication.

[0028] [Second embodiment] Next, a wireless communication device 20 according to a second embodiment of the present disclosure will be described. Note that the wireless communication device 20 according to the second embodiment is a specific example of the wireless communication device 10 according to the first embodiment.

[0029] 3 shows an example of the configuration of the wireless communication device 20. The wireless communication device 20 includes a receiving unit 21, a generating unit 22, a determining unit 23, an output unit 24, and a discriminating unit 25.

[0030] The receiving unit 21 performs a receiving process for receiving a desired signal from the input signal. The desired signal is a signal necessary for communication. The input signal is input to the receiving unit 21 from an antenna.

[0031] The generator 22 generates a frequency spectrum of the input signal.

[0032] The determination unit 23 determines whether or not the spreading code used in the reception process for receiving a signal spread by the spread spectrum method is synchronizable.

[0033] The output unit 24 outputs the frequency spectrum and the determination result as to whether or not synchronization is possible. In this embodiment, the output unit 24 outputs the frequency spectrum and the determination result to the identification unit 25.

[0034] The discrimination unit 25 outputs a discrimination result. The discrimination result is a result of discriminating between a desired signal and an unwanted signal for the input signal using the frequency spectrum and the judgment result. The unwanted signal is a signal that is not required for communication.

[0035] Next, FIG. 4 shows a configuration example of a wireless communication device 200 in the case where the wireless communication device 20 is applied to a transponder mounted on a satellite.

[0036] The wireless communication device 200 includes a transponder 201 and a processor 202 .

[0037] 3. The transponder 201 includes, as a receiving system, a receiving system high frequency unit 211, an A / D converter 212, an IQ demodulation unit 213, a carrier synchronization unit 214, a command demodulation unit 215, and a spreading code synchronization unit 216. The receiving system high frequency unit 211, the A / D converter 212, the IQ demodulation unit 213, the carrier synchronization unit 214, the command demodulation unit 215, and the spreading code synchronization unit 216 correspond to the receiving unit 21 in FIG.

[0038] Moreover, the transponder 201 includes, as a transmission system, a modulated signal processing unit 261, an IQ modulation unit 262, a D / A converter 263, and a transmission system high frequency unit 264.

[0039] Moreover, the transponder 201 includes a generating unit 220, a determining unit 230, and an output unit 240. The generating unit 220 corresponds to the generating unit 22 in Fig. 3. The determining unit 230 corresponds to the determining unit 23 in Fig. 3. The output unit 240 corresponds to the output unit 24 in Fig. 3.

[0040] 3. The processor 202 also includes a recognition unit 250. The recognition unit 250 corresponds to the recognition unit 25 in FIG.

[0041] The receiving system high frequency section 211 performs frequency conversion on the input signal input from the antenna from a high frequency to an intermediate frequency (IF (Intermediate Frequency)).

[0042] A / D converter 212 converts the analog signal input from receiving system high frequency section 211 into a digital signal.

[0043] The IQ demodulation unit 213 separates the signal input from the A / D converter 212 into an I (In Phase) channel and a Q (Quadrature Phase) channel.

[0044] The carrier synchronization unit 214 synchronizes with the carrier component of the signal input from the IQ demodulation unit 213, and converts the signal input from the IQ demodulation unit 213 into a baseband signal.

[0045] The command demodulation unit 215 demodulates the baseband signal and extracts the data signal.

[0046] The spreading code synchronization unit 216 synchronizes the I channel and Q channel input from the IQ demodulation unit 213 with a spreading code (for example, a PN (pseudo random noise) code). The spreading code synchronization unit 216 also performs processes related to demodulation, such as carrier synchronization and data synchronization.

[0047] The modulation signal processing unit 261 modulates the data signal into a baseband signal.

[0048] The IQ modulation unit 262 combines the I channel and Q channel of the signal input from the modulation signal processing unit 261 .

[0049] The D / A converter 263 converts the digital signal input from the IQ modulation unit 262 into an analog signal.

[0050] The transmission system high frequency section 264 performs frequency conversion on the signal input from the D / A converter 263 from an intermediate frequency (IF) to a high frequency.

[0051] The generation unit 220 performs FFT (Fast Fourier Transform) on each of the I channel and Q channel input from the IQ demodulation unit 213 to generate a frequency spectrum.

[0052] The determination unit 230 determines whether or not the spreading code used by the spreading code synchronization unit 216 is synchronizable with respect to the I channel and Q channel input from the IQ demodulation unit 213. When the spreading code synchronization unit 216 can use two or more spreading codes, it determines whether or not there is a synchronizable spreading code among the two or more spreading codes.

[0053] More specifically, the determination unit 230 performs code correlation processing using a spreading code on the I channel and Q channel input from the IQ demodulation unit 213, and determines that synchronization is possible when the correlation value exceeds a predetermined correlation threshold value.

[0054] The output unit 240 outputs to the decision unit 250 the frequency spectrum and the decision result as to whether or not the spreading code can be synchronized.

[0055] The discrimination unit 250 outputs a discrimination result, which is a result of discriminating between a desired signal and an unwanted signal for an input signal using the frequency spectrum and the judgment result.

[0056] In particular, when the desired signal is a spread signal that has been spread by a spread spectrum method, it is difficult to distinguish between the desired signal and an unwanted signal from the frequency spectrum alone. The discrimination unit 250 uses the result of the determination of whether synchronization is possible for discrimination, thereby making it possible to more accurately discriminate whether the input signal contains an unwanted signal.

[0057] If the spread code cannot be synchronized, the input signal does not include the desired signal. Therefore, the decision unit 250 determines that the input signal does not include the desired signal. The decision unit 250 then outputs a decision result indicating that the input signal does not include the desired signal.

[0058] Furthermore, if the spreading code is synchronizable, the input signal contains at least the desired signal. Therefore, the discrimination unit 250 determines that the input signal contains at least the desired signal if the spreading code is synchronizable. Furthermore, the discrimination unit 250 uses the frequency spectrum to discriminate between the desired signal and the unwanted signal, assuming that the desired signal is included. The discrimination unit 250 discriminates between the desired signal and the unwanted signal by spectrum analysis. This can reduce the possibility that the desired signal is regarded as an unwanted signal.

[0059] In this way, the wireless communication device 20 (wireless communication device 200) judges whether the spreading code is synchronized or not. This allows the discrimination unit 25 (discrimination unit 250) to discriminate between a desired signal and an unwanted signal using the result of the judgment of whether the spreading code is synchronized or not. Therefore, it is possible to improve the accuracy of detecting unwanted signals in a wireless communication device that receives a signal spread by a spread spectrum method.

[0060] In addition, the determination unit 23 determines whether or not the spreading code used by the receiving unit 21 (spreading code synchronization unit 216) to receive the spread signal can be synchronized. Therefore, it is possible to improve the detection accuracy of the unwanted signal without making a large-scale design change to the transponder 201.

[0061] The wireless communication device 20 (wireless communication device 200) can avoid interference signals by using the result of discrimination between a desired signal and an unwanted signal output from the discrimination section 25 (discrimination section 250), for example.

[0062] For example, when an unwanted signal is transmitted in the frequency band used for receiving signals, the receiver 21 of the wireless communication device 20 can change the reception frequency band to avoid interference. When changing the reception frequency band, a transmitter (not shown) that transmits a signal to the wireless communication device 20 also changes the transmission frequency band. When changing the reception frequency band, the wireless communication device 20 may notify the transmitter of the change in the frequency used.

[0063] Even if an unwanted signal is being transmitted in the reception frequency band, the wireless communication device 20 does not need to change the reception frequency band if a desired signal is being transmitted in the reception frequency band and is being normally received.

[0064] As candidates for the destination receiving frequency band, one or more candidates are set in advance in the wireless communication device 20. The wireless communication device 20 changes the receiving frequency band to a frequency band in which no unnecessary signals are transmitted, among the candidates for the destination frequency band.

[0065] In order to check whether or not an unwanted signal is being transmitted to the candidate frequency band to which the change is to be made, the generating unit 22 may generate a frequency spectrum for a frequency band including the current receiving frequency band and the candidate frequency band to which the change is to be made. The determining unit 23 may determine whether or not synchronization is possible with respect to an input signal including a signal of the current receiving frequency band and a signal of the candidate frequency band to which the change is to be made.

[0066] Next, a description will be given of an example of an operation flow of the wireless communication device 20. An example of an operation flow of the wireless communication device 20 is shown in FIG.

[0067] The generating unit 22 generates a frequency spectrum of an input signal (step S201).

[0068] The determination unit 23 determines whether or not the spreading code used in the signal processing is synchronizable with respect to the input signal (step S202).

[0069] The output unit 24 outputs the frequency spectrum and the determination result as to whether or not synchronization is possible (step S203).

[0070] The discrimination unit 25 discriminates between a desired signal and an unwanted signal using the frequency spectrum and the determination result, and outputs the discrimination result (step S204).

[0071] As described above, in the second embodiment of the present disclosure, the wireless communication device 20 includes a receiving unit 21, a generating unit 22, a determining unit 23, and an output unit 24. The receiving unit 21 performs a receiving process for receiving a desired signal from an input signal that has been input. The desired signal is a signal necessary for communication. The generating unit 22 generates a frequency spectrum of the input signal. The determining unit 23 determines whether or not a spreading code used in the receiving process for receiving a signal spread by a spread spectrum method is synchronizable with the input signal. The output unit 24 outputs the frequency spectrum and a determination result of whether or not synchronizability is possible.

[0072] In this way, the wireless communication device 20 judges whether the spread code can be synchronized with the input signal. This makes it possible to know whether the input signal contains a desired signal, thereby reducing the possibility that the desired signal will be regarded as an unwanted signal. This makes it possible to improve the detection accuracy of unwanted signals that are not required for wireless communication.

[0073] Furthermore, the determination unit 23 performs code correlation processing using a spread code on the input signal, and determines that synchronization is possible when the correlation value exceeds a predetermined correlation threshold value. In this way, it is possible to determine whether synchronization is possible.

[0074] Furthermore, the output unit 24 may output the determination result to the discrimination unit 25. The discrimination unit 25 outputs the discrimination result which is a result of discriminating between a desired signal and an unnecessary signal which is a signal unnecessary for communication. Furthermore, the discrimination unit 25 performs discrimination using a frequency spectrum and the determination result. This allows the discrimination unit 25 to realize more accurate discrimination using the determination result. Furthermore, the discrimination unit 25 may be located outside the wireless communication device 20. Furthermore, the wireless communication device 20 may further include the discrimination unit 25.

[0075] Furthermore, when the determination result indicates that synchronization is not possible, the discrimination unit 25 may determine that the input signal does not contain a desired signal. Furthermore, when the determination result indicates that synchronization is possible, the discrimination unit 25 may determine that the input signal contains a desired signal, and discriminate between a desired signal and an unwanted signal. In this way, the discrimination unit 25 can realize discrimination using the determination result.

[0076] Furthermore, when an unwanted signal is transmitted in the desired signal receiving frequency band, the receiver 21 may change the receiving frequency band, thereby enabling the wireless communication device 20 to take measures against interference using the identification result.

[0077] Furthermore, when the reception process can use multiple spread codes, the determination unit 23 determines whether or not there is a spread code that can be synchronized among the multiple spread codes. This makes it possible to determine whether or not synchronization is possible when the reception process can use multiple spread codes.

[0078] [Hardware configuration example] An example of the configuration of hardware resources for implementing the wireless communication device (10, 20, 200) in each embodiment of the present disclosure described above using one information processing device (computer) will be described. Note that the wireless communication device may be physically or functionally implemented using at least two information processing devices. The wireless communication device may also be implemented as a dedicated device. Also, only some of the functions of the wireless communication device may be implemented using an information processing device.

[0079] 6 is a diagram illustrating an example of a hardware configuration of an information processing device capable of implementing the wireless communication device according to each embodiment of the present disclosure. The information processing device 90 includes a communication interface 91, an input / output interface 92, a computing device 93, a storage device 94, a non-volatile storage device 95, and a drive device 96.

[0080] For example, the receiving unit 11 and the output unit 14 in FIG. 1 can be realized by a communication interface 91 and a calculation device, and the generating unit 12 and the determining unit 13 can be realized by a calculation device 93.

[0081] The communication interface 91 is a communication means for the wireless communication device of each embodiment to communicate with an external device in a wired and / or wireless manner. When the wireless communication device is realized using at least two information processing devices, the devices may be connected to each other via the communication interface 91 so as to be able to communicate with each other.

[0082] The input / output interface 92 is a man-machine interface including a keyboard as an example of an input device and a display as an output device.

[0083] The arithmetic device 93 is realized by an arithmetic processing device such as a general-purpose CPU (Central Processing Unit) or a microprocessor, and a plurality of electric circuits. The arithmetic device 93 can, for example, read various programs stored in a non-volatile storage device 95 into the storage device 94 and execute processing according to the read programs.

[0084] The storage device 94 is a memory device such as a RAM (Random Access Memory) that can be referenced by the arithmetic device 93, and stores programs, various data, etc. The storage device 94 may be a volatile memory device.

[0085] The non-volatile storage device 95 is, for example, a non-volatile storage device such as a ROM (Read Only Memory) or a flash memory, and is capable of storing various programs, data, and the like.

[0086] The drive device 96 is, for example, a device that processes reading and writing of data from and to a recording medium 97, which will be described later.

[0087] The recording medium 97 is any recording medium capable of recording data, such as an optical disk, a magneto-optical disk, or a semiconductor flash memory.

[0088] Each embodiment of the present disclosure may be realized, for example, by configuring a wireless communication device using an information processing device 90 illustrated in FIG. 6 and supplying a program capable of realizing the functions described in each of the above embodiments to this wireless communication device.

[0089] In this case, the embodiment can be realized by executing the program supplied to the wireless communication device by the arithmetic device 93. Also, it is possible to configure some, but not all, of the functions of the wireless communication device in the information processing device 90.

[0090] Furthermore, the wireless communication device may be configured so that the above program is recorded on a recording medium 97 and is appropriately stored in the non-volatile storage device 95 at the shipping stage or operation stage of the wireless communication device. In this case, the method of supplying the above program may be a method of installing the program in the wireless communication device using an appropriate tool at the manufacturing stage before shipping or at the operation stage. The method of supplying the above program may also be a general method such as downloading the program from an external source via a communication line such as the Internet.

[0091] A part or all of the above-described embodiments can be described as, but is not limited to, the following supplementary notes.

[0092] (Appendix 1) a receiving unit that performs a receiving process for receiving a desired signal, which is a signal necessary for communication, from an input signal that is input; A generator that generates a frequency spectrum of an input signal that is input; a determination unit that determines whether or not a spreading code used in the receiving process for receiving a signal spread by a spread spectrum method is synchronized with respect to the input signal; an output unit that outputs the frequency spectrum and a determination result as to whether or not synchronization is possible; A wireless communication device comprising:

[0093] (Appendix 2) the determination unit performs code correlation processing on the input signal using the spreading code, and determines that synchronization is possible when a correlation value exceeds a predetermined correlation threshold value. 2. The wireless communication device of claim 1.

[0094] (Appendix 3) The output unit outputs the determination result to a discrimination unit that outputs a discrimination result obtained by discriminating between a desired signal and an unnecessary signal that is a signal unnecessary for communication; The identification unit performs the identification using the frequency spectrum and the determination result. 3. The wireless communication device of claim 1 or 2.

[0095] (Appendix 4) The identification unit is further provided. 4. The wireless communication device of claim 3.

[0096] (Appendix 5) When the determination result indicates that synchronization is not possible, the identification unit determines that the input signal does not include a desired signal. 5. The wireless communication device of claim 3 or 4.

[0097] (Appendix 6) the discrimination unit determines that a desired signal is included in the input signal when the determination result indicates that synchronization is possible, and performs the discrimination between a desired signal and an undesired signal. 6. The wireless communication device of claim 5.

[0098] (Appendix 7) the receiving unit changes a reception frequency band when an unnecessary signal is transmitted in the reception frequency band of the desired signal. 7. A wireless communication device according to any one of Supplementary Note 3 to Supplementary Note 6.

[0099] (Appendix 8) the determination unit, when the receiving process can use a plurality of spread codes, determines whether or not there is a spread code that can be synchronized among the plurality of spread codes; 8. A wireless communication device according to any one of claims 1 to 7.

[0100] (Appendix 9) A receiving process is performed for receiving a desired signal, which is a signal necessary for communication, from the input signal that has been input; Generates the frequency spectrum of the input signal determining whether a spreading code used in the receiving process for receiving a signal spread by a spread spectrum method is synchronizable with respect to the input signal; outputting the frequency spectrum and a determination result as to whether or not synchronization is possible; A wireless communication method.

[0101] (Appendix 10) performing code correlation processing on the input signal using the spreading code, and determining that synchronization is possible when a correlation value exceeds a predetermined correlation threshold value; 10. The wireless communication method of claim 9.

[0102] (Appendix 11) outputting the determination result to a discrimination unit which outputs a discrimination result obtained by discriminating between a desired signal and an unnecessary signal which is a signal unnecessary for communication; performing the identification using the frequency spectrum and the determination result; 11. The wireless communication method of claim 9 or 10.

[0103] (Appendix 12) When the determination result indicates that synchronization is not possible, the identification unit determines that the input signal does not include a desired signal. 12. The wireless communication method of claim 11.

[0104] (Appendix 13) If the determination result indicates that synchronization is possible, it is determined that the input signal contains a desired signal, and the discrimination between the desired signal and an undesired signal is performed. 13. The wireless communication method of claim 12.

[0105] (Appendix 14) changing a reception frequency band when an unwanted signal is transmitted in the reception frequency band of the desired signal; 14. The wireless communication method according to any one of Supplementary Note 11 to Supplementary Note 13.

[0106] (Appendix 15) If the receiving process can use a plurality of spreading codes, determining whether or not there is a synchronizable spreading code among the plurality of spreading codes; 15. The wireless communication method according to any one of Supplementary Note 9 to Supplementary Note 14.

[0107] (Appendix 16) On the computer, A receiving function that performs a receiving process to receive a desired signal, which is a signal necessary for communication, from an input signal that is input; A generation function for generating a frequency spectrum of an input signal; a determination function for determining whether or not a spreading code used in the receiving process for receiving a signal spread by a spread spectrum method is synchronizable with respect to the input signal; an output function for outputting the frequency spectrum and a determination result as to whether or not synchronization is possible; A wireless communication program that realizes the above.

[0108] (Appendix 17) The determination function performs code correlation processing on the input signal using the spreading code, and determines that synchronization is possible when a correlation value exceeds a predetermined correlation threshold value. 17. The wireless communication program according to claim 16.

[0109] (Appendix 18) The output function outputs the determination result to a discrimination function that outputs a discrimination result that is a result of discriminating between a desired signal and an unnecessary signal that is a signal unnecessary for communication; The identification function performs the identification using the frequency spectrum and the determination result. 18. The wireless communication program according to claim 16 or 17.

[0110] (Appendix 19) The identification function is further implemented by a computer. 19. The wireless communication program of claim 18.

[0111] (Appendix 20) The identification function determines that the input signal does not include a desired signal when the determination result indicates that synchronization is not possible. 19. The wireless communication program according to claim 18.

[0112] (Appendix 21) The discrimination function determines that the input signal contains a desired signal when the determination result indicates that synchronization is possible, and discriminates between the desired signal and an undesired signal. 21. The wireless communication program of claim 20.

[0113] (Appendix 22) The receiving function changes a receiving frequency band when an unwanted signal is transmitted in a receiving frequency band of the desired signal. 22. The wireless communication program according to claim 18.

[0114] (Appendix 23) The determination function, when the receiving process can use a plurality of spreading codes, determines whether or not there is a synchronizable spreading code among the plurality of spreading codes. 23. The wireless communication program according to any one of Supplementary Note 16 to Supplementary Note 22.

[0115] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-mentioned embodiments. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be appropriately combined with other embodiments. [Explanation of symbols]

[0116] 10, 20, 200 Wireless communication device 11, 21 Receiver 12, 22, 220 generation section 13, 23, 230 Judgment section 14, 24, 240 Output section 25, 250 Identification section 201 Transponder 202 Processor 211 High frequency receiving section 212 A / D Converter 213 IQ demodulation section 214 Carrier Synchronization Unit 215 Command demodulation unit 216 Spreading code synchronization unit 261 Modulation signal processing section 262 IQ Modulation Section 263 D / A Converter 264 Transmission System High Frequency Section 90 Information processing equipment 91 Communication Interface 92 Input / Output Interface 93 Arithmetic unit 94 Storage device 95 Non-volatile storage devices 96 Drive device 97 Recording media

Claims

1. a receiving unit that performs a receiving process for receiving a desired signal, which is a signal necessary for communication, from an input signal that is input; A generator that generates a frequency spectrum of an input signal that is input; a determination unit that determines whether or not a spreading code used in the receiving process for receiving a signal spread by a spread spectrum method is synchronized with respect to the input signal; an output unit that outputs the frequency spectrum and a determination result as to whether or not synchronization is possible; A wireless communication device comprising:

2. the determination unit performs code correlation processing on the input signal using the spreading code, and determines that synchronization is possible when a correlation value exceeds a predetermined correlation threshold value. The wireless communication device of claim 1 .

3. The output unit outputs the determination result to a discrimination unit that outputs a discrimination result obtained by discriminating between a desired signal and an unnecessary signal that is a signal unnecessary for communication; The identification unit performs the identification using the frequency spectrum and the determination result. The wireless communication device of claim 1 .

4. The identification unit is further provided. The wireless communication device according to claim 3 .

5. When the determination result indicates that synchronization is not possible, the identification unit determines that the input signal does not include a desired signal.

5. The wireless communication device according to claim 3.

6. the discrimination unit determines that a desired signal is included in the input signal when the determination result indicates that synchronization is possible, and performs the discrimination between a desired signal and an undesired signal.

6. The wireless communication device according to claim 5.

7. the receiving unit changes a reception frequency band when an unnecessary signal is transmitted in the reception frequency band of the desired signal.

5. The wireless communication device according to claim 3.

8. the determination unit, when the receiving process can use a plurality of spread codes, determines whether or not there is a spread code that can be synchronized among the plurality of spread codes; The wireless communication device of claim 1 .

9. A receiving process is performed for receiving a desired signal, which is a signal necessary for communication, from the input signal that has been input; Generates the frequency spectrum of the input signal determining whether a spreading code used in the receiving process for receiving a signal spread by a spread spectrum method is synchronizable with respect to the input signal; outputting the frequency spectrum and a determination result as to whether or not synchronization is possible; A wireless communication method.

10. On the computer, A receiving function that performs a receiving process to receive a desired signal, which is a signal necessary for communication, from an input signal that is input; A generation function for generating a frequency spectrum of an input signal; a determination function for determining whether or not a spreading code used in the receiving process for receiving a signal spread by a spread spectrum method is synchronizable with respect to the input signal; an output function for outputting the frequency spectrum and a determination result as to whether or not synchronization is possible; A wireless communication program that realizes this.

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