JP2008172597A - Radio communication apparatus, radio communication system, digital radio-over-fiber communication method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a common radio communication apparatus which stores many terminal systems having various kinds of radio communication systems. <P>SOLUTION: The apparatus has a first storage portion which stores a digital signal digital-converted in such a state that a radio signal sent out of a first communication apparatus is not demodulated, a demodulation system selecting portion which selects and demodulates a modulation-demodulation system for demodulating the digital signal to be stored in the first storage portion, a second storage portion which stores the digital signal demodulated by the demodulation system selecting portion, and data transmitter which reads the digital signal stored in the second storage portion, extracts data requested from the read digital signal and transmits it to a second communication apparatus when a transmission request of the data to be transmitted from the second communication apparatus is brought. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radio communication system and a radio signal storage system, and more particularly to a radio communication apparatus and a radio communication system that can collect and store a wide variety of radio information by a unified method and distribute them safely. is there.

In the ubiquitous society, as seen in various sensor systems and tag systems, terminals with limited computing resources are connected to the network. Since these terminals communicate with each other in a predetermined method, individual networks are constructed by devices that can understand the communication method. In other words, it is necessary to construct a network for each application, and there is a big problem from the viewpoint of network flexibility and efficient operation. As a means for solving such a conventional technique, for example, a system using a common protocol has been studied (for example, see Non-Patent Document 1).
Ubiquitous Networking Forum, Sensor Network Subcommittee Technical Verification Technical Committee, NEWS RELEASE Starts technical verification of heterogeneous sensor network interconnection, [Search January 5, 2007], Internet <URL: http: //www.ubiquitous -forum.jp/info/newsrelease20060724.pdf>

However, the system shown in Non-Patent Document 1 described above has the following problems. That is, in a system using a common protocol, it is difficult to cope with various protocols, and there arises a problem of an increase in network cost such as installation of a gateway for converting the protocol.
On the other hand, with regard to applications that use data from a terminal device in the prior art, the use of information recorded by the terminal device, such as sensor values such as temperature and illuminance, terminal-specific identifiers, etc., is the main focus. Therefore, the data obtained by demodulating the radio signal is only used. At present, data before demodulation, for example, information such as signal arrival time and intensity is deleted. These data are valuable information when performing highly accurate positioning and the like, and it is desirable to use them as important data in order to provide advanced ubiquitous services.

  The present invention has been made in view of the above, and an object of the present invention is to provide a wireless communication apparatus and a wireless communication system that can accommodate a large number of terminal systems having a variety of wireless communication schemes, aiming at efficient operation of the network. It is to provide. At the same time, it builds a base for storing radio signals before demodulation and providing them safely to users.

  In order to solve the above-described problems, the present invention provides a means for uniformly capturing various radio signals, a means for storing radio signals before demodulation, a means for selecting a demodulation method, a means for analyzing various radio signals, It also has a means for searching for a radio signal. The means for capturing a wide variety of wireless signals provides a means for capturing various wireless signals at the same base station without depending on the wireless transmission scheme. The captured radio signal is transmitted on the optical fiber and stored in a means for storing the radio signal before demodulation installed in the network. The means for selecting a demodulation method selects an appropriate demodulation method and demodulates the stored radio signal. The means for analyzing the radio signal analyzes the demodulated radio signal and extracts the requested information. The wireless signal search means determines whether or not information can be provided in response to a request for service. If the information can be provided, the wireless signal search means searches for where the desired information is stored and provides the information.

  The present invention also provides a first accumulator that accumulates a digital signal that has been digitally converted without demodulating a radio signal transmitted from the first communication device, and a digital signal accumulated in the first accumulator. A demodulation method selection unit that selects and modulates a modulation / demodulation method for demodulation, a second storage unit that stores a digital signal demodulated by the demodulation method selection unit, and a data transmitted from the second communication device A data transmission unit that reads a digital signal stored in the second storage unit when there is a transmission request, and transmits the requested data to the second communication device from the read digital signal. Features.

  According to the present invention, in the wireless communication device described above, a third storage unit that stores access authority information indicating whether or not to permit access to the second communication device, and a transmission from the second communication device. And at least one of data stored in the first storage unit and data stored in the second storage unit based on the key information to be stored and the access authority information stored in the third storage unit And an access determination unit for determining whether to transmit any one of the data to the second communication device.

  In the wireless communication apparatus described above, the present invention further includes a fourth accumulation unit that accumulates attribute information including a terminal ID for identifying the first communication apparatus, and the demodulation scheme selection unit includes the fourth The digital signal corresponding to the attribute information stored in the storage unit is read out from the first storage unit and demodulated.

  According to the present invention, in the above-described wireless communication device, the wireless communication device includes a fifth storage unit that stores an identification ID for identifying a receiving device that receives a wireless signal transmitted from the first terminal device without being demodulated. The access determination unit is configured to generate data stored in the first storage unit based on key information transmitted from the second communication device and an identification ID stored in the fifth storage unit, and It is characterized in that it is determined whether at least one of the data stored in the second storage unit is transmitted to the second communication device.

  The present invention also provides a slave station device that receives a radio signal transmitted from a first communication device and generates a digital signal obtained by digitally converting the radio signal without demodulating the radio signal, the radio communication device described above, And an optical fiber that transmits the digital signal from the slave station to the wireless communication device via the optical fiber.

  In the present invention, a radio signal transmitted from the first communication device is received by a slave station device, the radio signal is digitally converted without being demodulated, and the digital signal is transmitted to the master station device via an optical fiber. In the digital fiber radio communication method, the digital signal is stored in the storage unit for each frequency band, a modulation / demodulation method for demodulating the digital signal is selected, a data transmission request is received from the second communication device, The second communication device determines whether or not access to the digital signal and the signal demodulated according to the modulation / demodulation method is permitted, and analyzes the demodulated signal when it is determined that access is permitted. Then, the data is transmitted to the second communication device.

  Further, the present invention selects a function for accumulating a digital signal obtained by digital conversion without demodulating the radio signal transmitted from the first communication device, and a modulation / demodulation method for demodulating the accumulated digital signal. If there is a function for demodulating the signal, a function for storing the demodulated digital signal, and a transmission request for data transmitted from the second communication device, the stored digital signal is read out and requested from the read digital signal. This is a program for realizing the function of extracting the received data and transmitting it to the second communication device.

  As described above, according to the present invention, radio signal data before demodulation is accumulated, demodulated and accumulated by selecting a modulation / demodulation method, and when there is a request for data transmission from a communication device, For the requested data, the demodulated and accumulated data is read out and transmitted to the communication device. Since the data of the radio signal before demodulation is also accumulated, information that is lost when the signal is demodulated can be provided as needed.

Hereinafter, a wireless communication system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention.
In FIG. 1, in a wireless communication system, a wireless communication device 100 and a wireless terminal 6 are connected by wireless. The radio communication device 100 includes a radio signal capturing unit 1, a pre-demodulation radio signal DB unit 2, a radio information analysis unit 3, a radio information search unit 4, a post-demodulation radio signal DB unit 5, a radio information index DB unit 7, and a demodulation method selection. Part 8.
For the wireless signal capturing unit 1, for example, the technique described in JP-A-2004-312150 can be used.
The radio signal capturing unit 1 includes an antenna and has a function of receiving a radio signal.
The radio signal capturing unit 1 receives a radio signal transmitted from the radio terminal 6, separates the radio signal for each frequency band by a filter provided in the radio terminal 6, converts the radio signal into a separated digital signal, and uses an optical fiber. It transmits to the radio signal DB part 2 before demodulation. The pre-demodulation radio signal DB unit 2 stores this radio signal for each frequency band.

The wireless terminal 6 is assigned a unique terminal ID for identifying each terminal, and the terminal ID is recorded at the head of the wireless signal to be transmitted. For information other than the terminal ID, arbitrary data can be written in a unique format. That is, the wireless terminal 6 transmits to the wireless signal capturing unit 1 as a wireless signal including a terminal ID and data to be transmitted (arbitrary data having a unique format).
A signal emitted from the wireless terminal 6 is captured by an antenna installed in the wireless signal capturing unit 1. In this embodiment, as long as the radio signal is a frequency band that can be captured by an installed antenna, the radio signal can be captured in the system without depending on the transmission method. The wireless signal captured by the wireless signal capturing unit 1 is separated for each frequency band by a filter provided in the wireless signal capturing unit 1, converted into a digital signal by the wireless signal capturing unit 1, and then transmitted by an optical fiber. And stored in the pre-demodulation radio signal DB unit 2 for each frequency band.

  The pre-demodulation radio signal DB unit 2 stores the information transmitted from the radio signal capturing unit 1 through an optical fiber. As the information to be stored, for example, information indicating a frequency band is given as a radio signal including the terminal ID of the radio terminal 6 that has transmitted the radio signal, and the information is stored for each frequency band.

  The post-demodulation radio signal DB unit 5 stores the radio signal data demodulated by the demodulation method selection unit 8.

  The demodulation method selection unit 8 detects the frequency band of the signal stored in the radio signal DB unit 2 before demodulation, selects an appropriate demodulation method of the signal, demodulates the radio signal according to the selected demodulation method, and after demodulation The radio signal data is stored in the radio signal DB unit 5 after demodulation. The radio demodulation method is limited to the demodulation method that can be used for each frequency band. Therefore, the demodulation method selection unit 8 stores a storage table that stores a frequency band and a demodulation method that can be used in the frequency band in association with each other, and refers to the storage table to determine a demodulation method corresponding to the frequency band. Is read out, the demodulation method can be selected and an appropriate demodulation method can be detected.

  Further, the demodulation method selection unit 8 extracts the terminal ID from the radio signal in the process of demodulating the radio signal, and stores the storage address information of the radio signal DB unit 2 before demodulation in which the radio signal before demodulation is stored as data. Then, the storage address information of the post-demodulation radio signal DB unit 5 in which the radio signal after demodulation is stored as data is stored in the radio information index DB unit 7 using the terminal ID as a key.

The radio information analysis unit 3 analyzes the structure of data stored in the post-demodulation radio signal DB unit 5 using radio signal definition information necessary for the analysis, and extracts necessary information from the data. This radio signal definition information is stored in advance in the radio information analysis unit 3 and describes the meaning of data corresponding to the delimiter symbol indicating the delimiter of the data and the appearance position of the token. It is used when the record stored in the signal DB unit 5 is decomposed into tokens and the meaning of the obtained tokens is extracted.
The wireless information analysis unit 3 is provided for each data structure to be processed, and is given an address for using the function.

  The wireless information search unit 4 accesses the wireless information index DB unit 7 and searches using the terminal ID as a key, thereby making a communication device that has made a data read request to the wireless communication device 100 (for example, a terminal device or the like). ) Detects the storage location of the requested data, reads the data from the storage location, extracts necessary information by the wireless information analysis unit 3, and sends it to the service (for example, a communication device) that has requested the data transmission. Send. In addition, when the data requested by the service is information on the radio signal before demodulation, the radio information search unit 4 transmits the radio data before demodulation to the service without going through the radio information analysis unit 3. In either case, whether or not access to the data is permitted is determined based on the access authority by referring to the access authority information stored in the wireless information index DB unit 7. The extracted information is transmitted only for the service that is being used.

FIG. 2 is a diagram illustrating a data configuration example stored in the wireless information index DB unit 7. Here, a case where a system is constructed assuming an IP network will be described.
The radio information index DB unit 7 stores pre-demodulation data storage address, post-demodulation data storage address, radio signal analysis address, and access authority information in association with each other using the terminal ID as a key. Information necessary in this system can be searched using the terminal ID as a key.
The pre-demodulation data storage address is information indicating an address for accessing the pre-demodulation radio signal DB unit 2 storing the radio signal data before decoding, and records an IP address and a port number.
The post-demodulation data storage address is information indicating an address for accessing the post-demodulation radio signal DB unit 5 that stores the data of the radio signal after decoding, and records an IP address and a port number.
The pre-demodulation data storage address and the post-demodulation data storage address are written to the wireless information index DB unit 7 by the demodulation method selection unit 8 when the demodulation method selection unit 8 reads or writes data of the radio signal. It is.
The radio signal analysis address is an address for specifying the radio information analysis unit 3 arranged in the network in order to analyze the structure of data transmitted by the radio terminal 6.
The access authority is information indicating whether or not access to the data of the radio signal is permitted. Here, it is stored as key information (for example, a password) for accessing data, and key information input when a data read request is made and stored key information (access authority information). It is determined whether or not they match, and if they match, it is determined that data reading is permitted.

  The owner of the wireless terminal 6 can arrange the wireless information analysis unit 3 having a function of analyzing data transmitted from the wireless terminal 6 in the network when the wireless terminal 6 is connected to the network. . At this time, the address on the network where the wireless information analysis unit 3 is arranged can be associated with the terminal ID and registered in the wireless information index DB unit 7.

  By having the above functions in combination with each other, it becomes possible to safely provide information from a terminal that emits an arbitrary data format to a necessary user without depending on the frequency and the modulation / demodulation method.

Next, the operation of the wireless communication system in the above-described embodiment will be described using the drawings.
FIG. 3 is a flowchart for explaining the operation of radio communication apparatus 100.
First, when a wireless signal is transmitted from the wireless terminal 6, the wireless communication device 100 receives and captures the transmitted wireless signal by the wireless signal capturing unit 1 (step S1), and the wireless signal is received for each frequency band. (Step S2), information indicating the frequency band is added and stored in the pre-demodulation radio signal DB unit 2 (step S3). The storage of the wireless signal data is performed every time the wireless signal is received.

  Next, the demodulation method selection unit 8 of the wireless communication apparatus 100 reads the data stored in the pre-demodulation wireless signal DB unit 2 and detects information indicating the frequency band given to the read data (step S4). The own storage table is searched, and the demodulation method is selected based on the information indicating the detected frequency band (step S5). When the demodulation method is selected, the demodulation method selection unit 8 demodulates the read data according to the demodulation method (step S6), and stores the demodulated data in the post-demodulation radio signal DB unit 5 (step S7). Then, the demodulation method selection unit 8 converts the address of the pre-demodulation radio signal DB unit 2 in which the read data is stored and the address of the post-demodulation radio signal DB unit 5 in which the demodulated data is stored into the read data. It is stored in the wireless information index DB unit 7 in association with the included terminal ID (step S8).

Next, a case where information stored in the post-demodulation radio signal DB unit 5 is read will be described with reference to the drawings. FIG. 4 is a flowchart for explaining the process of reading the information stored in the post-demodulation radio signal DB unit 5.
The communication device that reads data from the post-demodulation wireless signal DB unit 5 transmits a data read request to the wireless communication device 100 together with the terminal ID and key information.

  When receiving a data read request together with the terminal ID and key information from the communication device (step S11), the wireless information search unit 4 of the wireless communication device 100 reads the key information corresponding to the terminal ID from the wireless information index DB unit 7, The read key information is compared with the key information received from the communication device, and it is determined whether or not they match (step S12). If they do not match, it is determined that there is no access authority, and the process ends.

  On the other hand, if the key information matches, the wireless information search unit 4 searches the wireless information index DB unit 7 based on the terminal ID received from the communication device (step S13), and is associated with the designated terminal ID. The information of the post-demodulation data storage address and the radio signal analysis address is read (step S14), and the data stored in the read post-demodulation data storage address is read from the post-demodulation radio signal DB unit 5 (step S15). Then, the radio information search unit 4 analyzes the data read from the post-demodulation radio signal DB unit 5 by the radio information analysis unit 3 specified by the read radio signal analysis address (step S16), and obtains an analysis result. Necessary information is extracted from the data, and is transmitted to the communication device that has made the data read request (step S18).

  According to the embodiment described above, radio signal data before demodulation is demodulated and accumulated, and when there is a request for data transmission from the communication device, the demodulated radio signal is transmitted for the requested data. The data is extracted from the DB unit 5 by the wireless information analysis unit 3 and transmitted to the communication device. It is also possible to access the data before demodulation and transmit it to the communication device. As a result, information that is lost during demodulation can be accumulated and provided as necessary.

  In the above-described embodiment, the wireless information search unit 4 can transmit the wireless data before demodulation to the service without going through the wireless information analysis unit 3, but the demodulation is performed according to the service request. The entire wireless data before demodulation read from the previous wireless signal DB unit 2 may be transmitted to the service by the wireless information analysis unit 4, or necessary information is transmitted to the wireless information in response to a request from the service. The data may be extracted by the analysis unit 3 and transmitted by the wireless information analysis unit 4.

Next, a second embodiment will be described.
FIG. 5 is a schematic block diagram illustrating a configuration of a wireless communication system according to the second embodiment of the present invention. In this figure, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. This embodiment is different from FIG. 1 mainly in that a wireless terminal attribute information DB unit 9 is provided.

  In FIG. 3, the wireless terminal 6 is provided with a function of transmitting a wireless signal and a function of transmitting attribute information of the wireless terminal. With respect to this attribute information, communication is performed using a frequency band set in advance as a control channel. This attribute information is also received by the radio signal capturing unit 1 in the same manner as the radio signal, then transmitted through the optical fiber, and stored in the radio terminal attribute information DB unit 9.

  FIG. 6 is a diagram for explaining the attribute information of the wireless terminal 6 in the present embodiment. The attribute information includes header information used when the wireless terminal transmits a wireless signal, a terminal ID unique to the terminal, and information indicating the data size excluding the header. In this attribute information, header information included in the radio signal transmitted from the radio terminal is copied, and the terminal ID set in the radio terminal 6 itself and information indicating the data size excluding the radio signal header are connected. Information generated by the wireless terminal 6.

  When demodulating the radio signal stored in the pre-demodulation radio signal DB unit 2, the demodulation method selection unit 8 combines the attribute information stored in the radio terminal attribute information DB 9 and the data of the radio signal to be demodulated. Perform matching. The matching is performed based on whether the header information included in the attribute information matches the header information included in the radio signal data. If the same header information as the header information of the attribute information is included in the radio signal and the size of the data excluding the header is the same as the attribute information, the terminal ID is extracted from the attribute information. After the extraction, the wireless information index DB unit 7 is used to store various types of information using the terminal ID as a key.

  When each component unit has such a function, information from a terminal having an arbitrary data format can be provided to a necessary user without depending on the frequency and the modulation / demodulation method.

FIG. 7 is a schematic block diagram showing a wireless communication system according to the third embodiment of the present invention. In this figure, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.
In this embodiment, in addition to the wireless terminal 6, the wireless signal capturing unit 1 is also assigned a unique identification ID. This identification ID is recorded, for example, in a ROM (read-only memory) provided in the radio signal capturing unit 1 and transmitted by an optical fiber using a frequency reserved in advance, and is a radio signal storage location before demodulation. Recorded in the radio signal DB unit 2. In this embodiment, the radio signal capturing unit 1 and the pre-demodulation radio signal DB unit 2 have a one-to-one correspondence. That is, the pre-demodulation radio signal DB unit 2 shares a unique identification ID with the corresponding radio signal capture unit 1.

  The demodulation method selection unit 8 writes the identification ID of the radio signal capturing unit 1 in the radio information index DB unit 7 when reflecting the radio signal data in the radio information index DB unit 7.

  The administrator of the wireless signal capturing unit 1 records information on the access right of the wireless signal captured by the wireless signal capturing unit 1 in the wireless signal access DB unit 10 using the wireless signal capturing unit ID as a key. This access right is realized by registering a key for access in the DB and permitting it when the key input at the time of use matches the registered key.

FIG. 8 is a data configuration example of information stored in the wireless information index DB unit 7 in the present embodiment. Here, in addition to the information stored in the wireless information index DB unit 7 in the first embodiment, the identification ID of the wireless signal capturing unit 1 is stored in association with the terminal ID.
FIG. 9 is a diagram illustrating a data configuration example of information stored in the radio signal access DB unit 10. The radio signal access DB unit 10 stores the identification ID and the access authority in association with each other.

The communication device accesses the data of the radio signal by connecting to the radio information search unit 4 based on an instruction from the user. At this time, only the user authorized by the administrator of the radio signal capturing unit 1 can read the information. That is, the wireless information search unit 4 refers to the wireless information index DB unit 7 and reads the identification ID of the wireless signal capturing unit 1 when the wireless signal is captured, using the terminal ID specified by the communication device as a key. Then, the wireless signal access DB unit 10 is searched using the read identification ID and key, and access authority information is read. Next, the wireless information search unit 4 compares the key information input from the communication device with the access authority (key information) read from the wireless signal access DB unit 10, and based on whether or not they match, Judge whether access is possible for data reading. Only when the key information matches and access is permitted, the data of the wireless information can be read out.
By having the above-described functions in combination with each other, it becomes possible to provide necessary users with information from a terminal having an arbitrary data format without depending on the frequency and modulation / demodulation method. Further, according to this embodiment, it is possible to manage the users who can refer to the data of the radio signal based on the access authority information input from the administrator of the radio signal capturing unit 1.

  In the above-described embodiment, the wireless communication system in the second embodiment and the wireless communication system in the third embodiment may be combined and configured as a wireless communication system using attribute information and identification ID. .

  Further, the program for realizing the function of the wireless communication apparatus 100 in FIG. 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed to execute data recording. You may manage accumulation and transmission. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

It is a schematic block diagram which shows the structure of the radio | wireless communications system by one Embodiment of this invention. It is a figure which shows the example of a data structure memorize | stored in the radio | wireless information index DB part. 5 is a flowchart for explaining the operation of wireless communication apparatus 100. It is a flowchart for demonstrating the process which reads the information stored in the radio signal DB part 5 after a demodulation. It is a schematic block diagram which shows the structure of the radio | wireless communications system in the 2nd Embodiment of this invention. It is drawing for demonstrating the attribute information of the radio | wireless terminal 6 in this embodiment. It is a schematic block diagram which shows the radio | wireless communications system in the 3rd Embodiment of this invention. It is a data structural example of the information memorize | stored in the radio | wireless information index DB part 7 in this embodiment. 3 is a diagram illustrating a data configuration example of information stored in a radio signal access DB unit 10. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radio signal capture part 2 Radio signal DB part before demodulation 3 Radio information analysis part 4 Radio information search part 5 Radio signal DB part after demodulation 6 Radio terminal 7 Radio information index DB part 8 Demodulation system selection part 9 Radio terminal attribute information DB part 10 Radio signal access DB section

Claims (7)

A first accumulator that accumulates a digital signal obtained by digital conversion without demodulating the radio signal transmitted from the first communication device;
A demodulation method selection unit that selects and demodulates a modulation / demodulation method for demodulating the digital signal stored in the first storage unit;
A second accumulator for accumulating the digital signal demodulated by the demodulation scheme selector;
When there is a transmission request for data transmitted from the second communication device, the digital signal stored in the second storage unit is read, and the requested data is read from the read digital signal to the second communication device. A data transmitter to transmit;
A wireless communication apparatus comprising: A third storage unit that stores access authority information indicating whether or not to permit access to the second communication device;
Based on the key information transmitted from the second communication device and the access authority information stored in the third storage unit, the data stored in the first storage unit and the second storage unit An access determination unit that determines whether or not to transmit at least one of stored data to the second communication device;
The wireless communication apparatus according to claim 1, further comprising: A fourth storage unit for storing attribute information including a terminal ID for identifying the first communication device;
3. The radio according to claim 1, wherein the demodulation method selection unit reads and demodulates a digital signal corresponding to attribute information stored in the fourth storage unit from the first storage unit. Communication device. A fifth storage unit that stores an identification ID for identifying a receiving device that receives the wireless signal transmitted from the first terminal device without being demodulated;
The access determination unit, based on the key information transmitted from the second communication device and the identification ID stored in the fifth storage unit, the data stored in the first storage unit and the first 4. The wireless communication device according to claim 2, wherein it is determined whether or not at least one of the data stored in the storage unit of 2 is transmitted to the second communication device. 5. . 5. The slave station device that receives a radio signal transmitted from the first communication device and generates a digital signal obtained by digitally converting the radio signal without demodulating the radio signal; and any one of claims 1 to 4. A wireless communication device described; and an optical fiber that transmits the digital signal from the slave station to the wireless communication device via an optical fiber;
A wireless communication system comprising: In a digital fiber radio communication method in which a radio signal transmitted from a first communication device is received by a slave station device, the radio signal is digitally converted without being demodulated, and the digital signal is transmitted to the master station device via an optical fiber. ,
The digital signal is stored in the storage unit for each frequency band, a modulation / demodulation method for demodulating the digital signal is selected, a data transmission request is received from the second communication device, and the second communication device It is determined whether access is permitted to the digital signal and the signal demodulated according to the modulation / demodulation method. When it is determined that access is permitted, the demodulated signal is analyzed, and the second signal is analyzed. Send to communication device,
A digital fiber radio communication method. On the computer,
A function of storing a digital signal obtained by digital conversion without demodulating the radio signal transmitted from the first communication device;
A function of selecting and demodulating a modulation / demodulation method for demodulating the stored digital signal;
A function of storing the demodulated digital signal;
When there is a transmission request for data transmitted from the second communication device, a function of reading the accumulated digital signal, extracting the requested data from the read digital signal, and transmitting the data to the second communication device;
As a program to realize.

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