JP2002368672A - Wireless communication unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless communication unit with ease of installation works and high reliability, that uses an optical fiber which does not need countermeasures against an indirect lightning stroke with a light weight between an indoor unit and an outdoor unit. SOLUTION: The wireless communication unit 100 of this invention is separated into an indoor unit 10 and an outdoor unit 30 and conducts wireless communication with an opposite station via an antenna of the outdoor unit. In this case, the optical fiber 20 interconnects the indoor unit 10 and the outdoor unit 30 for transmission reception of signals and power. The indoor unit 10 superimposes a transmission optical signal on a high output laser with an optical energy equivalent to the power and transmits a resulting hybrid optical signal to the outdoor unit via the optical fiber 20. The outdoor unit 30 separates the transmission optical signal and the high-output laser, generates a transmission signal from the transmission optical signal and transmits the transmission signal from an antenna, generates power from the high output laser for supplying power to each section of the outdoor unit. The transmission reception of the signal and the power of the optical medium is hardly affected by the disturbance of an electromagnetic wave generating source, such as lightning, and the unit 100 is also small and light weight and its installation work is easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication device, and more particularly to a radio communication device which is separated into an indoor device and an outdoor device and performs radio communication with a partner station via an antenna of the outdoor device.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional radio communication system composed of a base station and a subscriber station using a radio communication apparatus using a microwave band or a millimeter wave band. The radio base station 110 and the subscriber station 12 of this radio communication system
0 is an outdoor device 60, 90 arranged near the antenna.
And indoor devices 40 and 70 arranged in a room. The operator is, for example, the indoor device 4
By operating 0, the IF signal (intermediate frequency signal) is modulated and delivered to the outdoor device 60. The outdoor device 60 converts the received modulated IF signal into a transmission signal having a transmission frequency, and transmits the signal from an antenna to a partner station, for example, the subscriber station 120. In the subscriber station 120, the transmitted transmission signal is received by the antenna of the outdoor device 90, and delivered from the outdoor device 90 to the indoor device 70 as an IF signal.
In this case, the indoor device and the outdoor device are usually connected by coaxial cables 50 and 80. The coaxial cable transmits and receives a transmission IF signal and a reception IF signal between the indoor device and the outdoor device, and supplies power from the indoor device to the outdoor device.

[0003]

In the above-mentioned conventional wireless communication apparatus, transmission I between an indoor apparatus and an outdoor apparatus is performed.
The transmission and reception of the F signal and the reception IF signal and the power supply from the indoor device to the outdoor device are performed by a coaxial cable, but the distance between them may reach about 300 m,
Even if the number of cables used is reduced to one, the construction between these devices is not easy because coaxial cables are used, and measures against induced lightning are required to prevent noise interference. It is.

[0004] The present invention has been made in view of the above-mentioned circumstances, and the connection of a coaxial cable between an indoor unit and an outdoor unit is replaced with a light-weight connection of an optical fiber which does not require a countermeasure against induced lightning. An object is to provide an easy and reliable wireless communication device.

[0005]

In order to solve the above-mentioned problem, the present invention is divided into an indoor device and an outdoor device,
In a wireless communication device that performs wireless communication with a partner station via an antenna of an outdoor device, an optical fiber connecting the indoor device and the outdoor device is provided in the indoor device, and a transmission optical signal is superimposed on a high-power laser and mixed. A mixed optical signal processing means for transmitting an optical signal to an outdoor device through an optical fiber; and a transmitting optical signal provided in the outdoor device for separating and generating a transmission optical signal from the transmitted mixed optical signal, transmitting the signal from an antenna, and transmitting the signal. Wireless signal processing means for separating a high-power laser from the received mixed optical signal to generate electric power and supply it as a power supply.

According to such a configuration, transmission and reception of signals and electric power between the indoor device and the outdoor device are performed using light as a medium through a lightweight optical fiber. Even if they are far apart, construction is easy, and there is no electrical disturbance due to lightning strikes for sending and receiving signals.

In the embodiment of the present invention, the indoor device 10 and the outdoor device 30 are connected by an optical fiber 20. The mixed optical signal processing means in the indoor device 10 includes an electric / optical converter 11, a high-power laser oscillator 12, and a hybrid circuit 13, and the electric / optical converter 1
1 converts transmission data into a transmission optical signal, a high-power laser oscillator 12 oscillates a high-power laser, and a hybrid circuit 1
3 superimposes the transmission optical signal on the high-power laser and transmits it as a mixed optical signal to the outdoor device 30 via the optical fiber 20.
The wireless signal processing means in the outdoor device 30 includes an electric / optical converter 31, a modem 32, a hybrid circuit 33, a frequency converter 34, an antenna 35, and a photoelectric element 36. 36 separates the transmitted optical signal from the high power laser and generates transmitted data and power. The transmission data is transmitted to the modem 32 and the frequency converter 3.
4 and transmitted from the antenna 35 to the partner station. The generated electric power is supplied to each unit of the outdoor device 30 as a power supply.

In the present invention, the wireless signal processing means of the outdoor device converts a received signal received by an antenna into a received optical signal, transmits the signal to an indoor device via an optical fiber, and mixes the indoor device. The optical signal processing means converts the received optical signal into electrical signal reception data. Therefore, signals can be transmitted and received by a configuration similar to the configuration described earlier.

Further, according to the present invention, the wireless communication apparatus is installed in a subscriber station of a subscriber wireless system for performing wireless communication between a wireless base station and a subscriber station.

In the embodiment, the present apparatus 100
Is used for a subscriber station or the like, the indoor device 10
At the time of transmission, the transmission data which is an electric signal is converted into a transmission optical signal, and at the time of reception, the indoor electric / optical converter 11 which converts the reception light signal into the reception data which is an electric signal, and a high-power laser which outputs a high-power laser. Output laser oscillator 12 and optical path 11a for indoor converter connected to indoor electrical / optical converter 11
And an indoor hybrid circuit 13 for connecting an indoor converter optical path 12a connected to the high-power laser oscillator 12 to the optical fiber 20. The outdoor device 30 connects the optical fiber 20 to an outdoor converter optical path 31a. Outdoor hybrid circuit 33 connected to the optical path 36a
At the time of transmission, from the mixed optical signal sent via the hybrid circuit 33 and the optical path for outdoor converter 31a,
An outdoor electrical / optical converter that converts and outputs transmission data of an electrical signal, converts received data to a received optical signal and transmits the received optical signal to the indoor device 10 via the outdoor converter optical path 31a and the hybrid circuit 33 during reception. 31, a transmitter / receiver 31 that modulates the data with transmission data from the outdoor electrical / optical converter 31 during transmission, a demodulator 32 that demodulates a received signal to obtain received data during reception, and a modulator / demodulator 3 that transmits data.
The frequency converter 3 converts the frequency of the signal from the antenna 35 and transmits the signal from the antenna 35 to the partner station. At the time of reception, the frequency converter 3 converts the frequency of the signal received from the antenna 35 and delivers it to the modem 32.
4 and a photoelectric element 36 that separates a high-power laser from the mixed optical signal input through the hybrid circuit 33 and the optical path for photoelectric element 36a to generate power, and supplies power as a power source to each unit of the outdoor device 30. Have. Therefore,
The wireless communication device 100 can be easily realized without using expensive components.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of the wireless communication device of the present invention. The wireless communication device 100 shown in FIG. 1 is suitable for use in, for example, a wireless base station or a subscriber station of the conventional wireless communication system shown in FIG. The wireless communication device 100
It has an indoor device 10, an optical fiber 20 having one end connected to the indoor device 10, and an outdoor device 30 connected to the other end of the optical fiber 20. The indoor device 10 includes an electric / optical converter 11, a high-power laser oscillator 12, and a hybrid circuit 13. The electric / optical converter 11 converts transmission data, which is an electric signal, into a transmission optical signal during transmission and outputs the transmission optical signal via the optical path 11a, and receives a reception optical signal via the optical path 11a during reception, It is converted into received data which is an electric signal. In this case, input / output of the electrical / optical converter 11 is performed via a signal filter that allows only transmission / reception data to pass.

The high-power laser oscillator 12 oscillates a high-power laser sufficient to always provide optical energy corresponding to the power required by the outdoor device 30 while the wireless communication device 100 is operating. , Through the optical path 12a. In this case, the frequency of the high-power laser oscillated by the high-power laser oscillator 12 has a value sufficiently distant from the frequency of the transmitted and received optical signal so as to facilitate separation from the transmitted and received optical signal. Are output through an oscillator filter that can pass only a high-power laser. The hybrid circuit 13 connects the optical paths 11a and 12a to the optical fiber 20, and superimposes the transmission optical signal from the optical path 11a on the high-power laser for power of the high-output laser oscillator 12 from the optical path 12a during transmission. The light is sent to one end of the optical fiber 20 as a mixed optical signal.

The outdoor device 30 includes an electric / optical converter 31 and
A modem 32, a hybrid circuit 33, an antenna 3
5 and a photoelectric element 36. Hybrid circuit 33
Connects the other end of the optical fiber 20 to one end of each of the optical paths 31a and 36a. The electric / optical converter 31 transmits the hybrid circuit 33 and the optical path 3 during data transmission.
Transmission data, which is an electric signal, is separated and extracted from the mixed optical signal input through the signal filter 1a through a signal filter. At the time of data reception, the reception data is converted into a reception optical signal and converted through the optical path 31a and the hybrid circuit 33. Out to the optical fiber 20. At the time of transmission, the modulator / demodulator 32 modulates with the output of the electrical / optical converter 31, and the frequency converter 34 converts this to a predetermined transmission frequency, amplifies it to the required output, and transmits it from the antenna 35 to the partner station. Fire. At the time of data reception, the frequency converter 34 converts the reception frequency of the reception signal received by the antenna 35 to a predetermined reception frequency, and the modem 32 demodulates the received data and delivers it to the electrical / optical converter 31.

The hybrid circuit 33 and the optical path 3
The photoelectric element 36 receiving the mixed optical signal via 6a
By extracting a high-power laser from the high-power laser oscillator 12 with a converter filter and performing photoelectric conversion, electric power is generated from the high-power laser and supplied as power to each unit of the outdoor device 30 such as the electric / optical converter 31. I do. In the above example, the electric / optical converters 11, 31 and the high-power laser oscillator 1
2. Processing related to separation of a high-power laser and an optical signal performed in the photoelectric element 36 may be performed by an optical wavelength filter, or may be performed by a filter electronic circuit after processing of each unit. As apparent from this example, the indoor device 10
The outdoor device 30 is connected to the outdoor device 30 by an optical fiber 20, and transmission and reception signals and power supply are transmitted and received using light as a medium. Therefore, even if the optical fiber 20 is long, it is hardly affected by noise interference of an electromagnetic wave generation source such as lightning. . The optical fiber 20 is
Compared to a coaxial cable, there is an advantage that the installation work is easy because the size is small and light.

[0015]

The wireless communication apparatus according to the present invention is configured as described above, and the optical fiber connecting the indoor apparatus and the outdoor apparatus transmits and receives signals and power using light as a medium. Therefore, the optical fiber 20 is less susceptible to noise interference from an electromagnetic wave generation source such as lightning, and the optical fiber 20 is smaller in size and lighter in weight than a coaxial cable, so that installation work is easy.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of a wireless communication device according to the present invention.

FIG. 2 is a configuration diagram illustrating a wireless communication system in which a base station and a subscriber station are configured by a conventional wireless communication device.

[Explanation of symbols]

10 Indoor equipment, 11, 31 Electrical / optical converter, 11
a, 12a, 31a, 36a Optical path, 12 High power laser oscillator, 13, 33 Hybrid circuit, 20 optical fiber, 32 Modulator / demodulator, 34 Frequency converter, 35 Antenna.

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Claims (3)

[Claims] 1. A wireless communication device which is separated into an indoor device and an outdoor device and performs wireless communication with a partner station via an antenna of the outdoor device, comprising: an optical fiber connecting the indoor device and the outdoor device; A mixed optical signal processing means for superimposing a transmission optical signal on a high-power laser and transmitting the mixed optical signal to an outdoor device via an optical fiber; and a transmitting optical signal provided in the outdoor device and transmitting the mixed optical signal. While separating and generating optical signals and sending them out of the antenna,
A wireless signal processing unit that separates a high-power laser from the transmitted mixed optical signal to generate power and supply the generated power as a power source. 2. The wireless communication device according to claim 1, wherein the wireless signal processing unit of the outdoor device converts a received signal received by an antenna into a received optical signal, and transmits the received optical signal to the indoor device via an optical fiber. The mixed optical signal processing means of the indoor device is a wireless communication device that converts a received optical signal into received electrical signal data. 3. A wireless communication device installed in a subscriber station of a subscriber wireless system for performing wireless communication between a wireless base station and a subscriber station, wherein the wireless communication device according to claim 1 or 2 is provided. .