JP2000341744A - Wireless device - Google Patents

Abstract

(57) [Problem] To simplify connection work between an outdoor device and an indoor device and to perform high transmission power without distortion. SOLUTION: Antenna 100a, duplexer 100
b, a high-power first wireless device 100 including a low-noise amplifier 100c is provided outdoors, and N low-power first wireless devices 1, 2,... using low power are provided outdoors. Each of the wireless devices 1, 2,... Comprises an antenna 1a, a duplexer 1b, a low noise amplifier 1c, a power amplifier 1d, an electric / optical converter 1e, and an optical / electric converter 1f. A high-power second wireless device 101 including an A / D converter 112, a D / A converter 122, a receiver 113, a transmitter 123, and a power amplifier 124 is provided indoors, and the first wireless device 100 and the coaxial cable 30 are provided. Connect with. N second low-power wireless devices each including an A / D converter 12, a receiver 13, an O / E converter 15, a D / A converter 22, a transmitter 23, and an E / O converter 25 are provided indoors. Are connected to the N first wireless devices 1, 2,... By a multi-core optical fiber cable 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio apparatus used for, for example, a base station radio apparatus for mobile communication and configured using an array antenna, and particularly relates to a power supply configuration thereof.

[0002]

2. Description of the Related Art In a mobile communication base station, its antenna is installed at a high place such as a steel tower or the roof of a building, and most of the wireless devices are often installed inside the building. FIG.
Shows a configuration example of a conventional wireless device. The wireless device 1 is a portion installed at a high place and mainly includes an antenna 1a, a duplexer 1b, and a low noise amplifier 1c. On the other hand, the receiver 13, the transmitter 23, and the power amplifier 24 are placed inside the building. These are connected by a coaxial cable 30.

In this base station radio apparatus, an antenna 1
The signal received at a is amplified by the low noise amplifier 1c via the duplexer 1b. This received signal is transmitted through coaxial cable 3
0, the signal is transmitted to the receiver 13 and frequency-converted in the receiver, and then demodulated to obtain a received baseband signal. On the other hand, the transmitter 23 generates a high-frequency signal modulated with a transmission baseband signal, which is amplified by the power amplifier 24. This high-frequency signal is transmitted to the wireless device 1 at a high place by the coaxial cable 30, and transmitted from the antenna 1a via the duplexer 1b.

In such a wireless device, one received signal and one transmitted signal are handled. In contrast,
There is a method of improving communication quality by arranging a plurality of antennas in an array and optimally controlling the amplitude and phase of signals transmitted and received by each antenna for each mobile station. FIG. 4 shows an example in which a base station radio apparatus using an array antenna is configured using a conventional technique. Here, a plurality of wireless devices equivalent to the wireless device 1 in FIG. 3 are provided below the wireless device 2, and one antenna is provided for each wireless device. Hereinafter, a description will be given assuming that there are N wireless devices and N antennas in all. These received signals are supplied to N receivers including the receiver 13 by independent coaxial cables 30. These are demodulated into baseband signals, then converted into digital signals by an analog / digital converter 12 or the like, and input to the reception signal processing device 11. The reception signal processing device 11 performs an operation on the N reception signals to decompose them into a plurality of reception signals 10 corresponding to individual mobile stations.

[0005] A plurality of transmission signals 20 directed to individual mobile stations are converted into N transmission signals corresponding to each antenna by a transmission signal processing device 21, and then converted by a digital / analog converter 22 and the like. It is converted to an analog baseband signal. These are also the transmitter 23
After being converted to a high-frequency signal by the power amplifier 24 and the like, the signal is amplified by the power amplifier 24 and the like, sent to the high-altitude wireless device via the coaxial cable 30, and transmitted from the antennas 1a and 2a.

[0006]

SUMMARY OF THE INVENTION As shown in FIG.
2. Description of the Related Art In a wireless device configured according to the related art, a plurality of antennas and a transmitting / receiving device required when an array antenna is used are connected using individual coaxial cables. For this reason, it is necessary to lay a large amount of coaxial cables from a high place such as the roof of a building where an antenna or the like is installed into a building where most of the wireless devices are housed. This not only increases the cost of the installation work, but also makes it difficult to lay the cable itself depending on the conditions of the installation place, which is a major obstacle in using the array antenna. It is conceivable to use an optical fiber cable instead of a coaxial cable to facilitate construction. However, in this case, distortion occurs in the process of optical / electrical conversion and electrical / optical conversion, and transmission of large transmission power becomes difficult.

[0007] It is an object of the present invention to solve the necessity of laying such a large amount of coaxial cables, and to provide a radio apparatus which can be installed by simpler construction and can use a large transmission power. It is in.

[0008]

According to a first aspect of the present invention, there is provided a wireless device comprising a first wireless device group and a first high-output wireless device installed at a high place, and a second wireless device installed indoors. It consists of a wireless device group and a second high-power wireless device. The first wireless device group mainly includes N wireless devices including an antenna, a duplexer, a low-noise amplifier, a power amplifier, an electric / optical converter, and an optical / electrical converter. The group consists of N wireless devices with receivers, transmitters, electrical / optical converters, optical / electrical converters. The first high-output radio device mainly includes an antenna, a duplexer, and a low-noise amplifier, and the second high-output radio device includes a receiver, a transmitter, and a power amplifier. The first wireless device group and the second wireless device group are connected by a multi-core optical fiber cable, and input / output terminals of individual wireless devices included in the first wireless device group are included in the multi-core optical fiber cable. The core wire is connected to the input / output terminal of each wireless device included in the second wireless device group. On the other hand, the first high-output wireless device and the second high-output wireless device are connected by a coaxial cable.

As described above, in the wireless device according to the first aspect of the present invention, the connection using the coaxial cable is used only between one set of wireless devices, and the other wireless devices are connected using one multi-core optical fiber cable. Therefore, an effect is obtained that the number of coaxial cables laid from a high place such as a tower or a rooftop to the inside of the building can be reduced. In the wireless device according to the third aspect of the present invention, the N wireless devices installed at a high place include:
A receiver that includes an antenna, a duplexer, a low-noise amplifier, and a power amplifier, and further demodulates a received signal and outputs a received baseband signal; a transmitter that converts a transmitted baseband signal to a high-frequency signal; An analog / digital converter for converting a digital signal into a digital signal and a digital / analog converter for converting a digital signal into a transmission baseband are provided. Output signals of the N wireless devices are bundled into one series of signals by a multiplexer, converted into optical signals by an electrical / optical converter, and transmitted indoors by optical fiber cables. Also, a signal transmitted in the form of an optical signal from indoors is converted into an electric signal by an optical / electrical converter, and then separated into N-sequence signals by a separating device and input to N wireless devices.

On the other hand, devices installed indoors mainly include a demultiplexing device for extracting an N-sequence received signal from a multiplexed received signal, a reception signal processing device for processing an N-sequence received signal,
A transmission signal processing device for generating a series of transmission signals, and a multiplexing device for multiplexing N-sequence transmission signals, for transmitting and receiving signals in the form of optical signals to and from a wireless device installed at a high place. A converter and an optical / electrical converter are provided.

Thus, the wireless device according to the third aspect of the present invention
Since the function of the transceiver is provided on the antenna side, and the interface with the indoor equipment is in the form of an optical signal modulated with multiplexed digital signals, an optical fiber is used between the radio equipment installed at high altitude and the indoor equipment. It is characterized in that it can be connected with two cables, and an effect is obtained that it is easy to lay a cable from a high place such as the roof of a building to the inside of the building.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the first and second aspects of the present invention will be described with reference to FIG. The first wireless device group 40 and the first high-power wireless device 100 are installed at a high place such as on a steel tower or the roof of a building, and the second wireless device group 41 and the second high-power wireless device 100 are installed. 101 is installed indoors. The first wireless device group 40 includes N antennas such as the antenna 1a and the antenna 2a, and N wireless devices such as the wireless device 1 and the wireless device 2. These N wireless devices are the duplexer 1
b, a low-noise amplifier 1c, a power amplifier 1d, an electric / optical converter 1e, and an optical / electric amplifier 1f connected thereto. The second wireless device group 41 includes N sets of devices including the optical / electrical converter 15, the transmitter 13, and the analog / digital converter 12 as one set, and the electrical / optical converter 2
5. N sets of devices including the transmitter 23 and the digital / analog converter 22 as one set, and the received signal processing device 11
And a transmission signal processing device 21. The first wireless device group 40 and the second wireless device group 41 are connected by a multi-core optical fiber cable 31, and the first high-output wireless device 100
The second high-output wireless device 101 is connected by a coaxial cable 30. The first high-power radio apparatus 100 includes an antenna 100a, a duplexer 100b, a low-noise amplifier 10
0c. The second high-power wireless device 101 includes an analog / digital converter 112, a receiver 113, a digital / analog converter 122, a transmitter 123, and a power amplifier 124. The analog / digital converter 112, the digital / analog converter Reference numeral 122 is connected to the reception signal processing device 11 and the transmission signal processing device 21, respectively.

The signals received by the antennas included in the first wireless device group 40 are amplified by the low noise amplifiers 1c in N wireless devices such as the wireless device 1 and the wireless device 2, respectively, and further amplified by the respective electrical devices. After the electrical / optical conversion is performed by the optical / optical converter 1e, the signals are sent to the second wireless device group 41 installed indoors by the cores of the multi-core optical fiber cable 31 one by one. In the second wireless device group 41, these optical signals are converted back to electrical signals by the optical / electrical converters 15,... And demodulated by the receivers 13,. Is done.
This baseband signal is supplied to the analog / digital converter 1
After being converted into digital signals by 2,..., They are sent to the reception signal processing device 11. On the other hand, the signal received by the antenna 100a is amplified by the low noise amplifier 100c, sent to the receiver 113 via the coaxial cable 30 as an electric signal, and demodulated. This signal is also converted into a digital signal by the analog / digital converter 112 and then sent to the reception signal processing device 11. The N + 1 series signals input to the reception signal processing device 11 are collectively processed, and a required reception signal 10 is obtained.

Next, the signal 20 to be transmitted is converted by the transmission signal processor 21 into an N + 1 series digital signal. The N-sequence is converted into an analog signal by the digital / analog converters 22,..., And converted into high-frequency signals by the transmitters 23,. Are converted into optical signals, respectively, and transmitted to the wireless device group 1 by the multi-core optical fiber cable 31. On the other hand, the remaining one-series signal is converted into an analog signal by a digital / analog converter 122, converted into a high-frequency signal by a transmitter 123, further amplified by a power amplifier 124, and converted into an electric signal as it is. Transmitted by

In the first wireless device group 40, the N-sequence optical signal is converted back to an electric signal by each optical / electrical converter 1f, and further amplified to a required power level by each power amplifier 1d. ... Sent by On the other hand, in the first high-output wireless device 100,
The signal from the coaxial cable 30 is directly used for the duplexer 10
0b from the antenna 100a.

Replacing the signal between the wireless device groups with an optical signal has the advantage that a fine and lightweight optical fiber can be connected, but on the other hand, distortion occurs in the process of conversion between light and electricity. Therefore, transmission may be difficult when large transmission power is required. In this embodiment, a relatively low-power N-sequence signal is replaced by an optical signal and transmitted by a multi-core optical fiber cable, and the first high-power radio apparatus 100 requiring particularly large transmission power and the second Only the high-output wireless device 101 is connected by the coaxial cable 30. However, these N + 1 sets of wireless devices operate integrally, and the transmission / reception signals are collectively processed by the reception signal processing device 11 and the transmission signal processing device 21. This has the advantage that cable laying can be minimized.

Next, an embodiment of the present invention will be described with reference to FIG. The N wireless devices including the wireless device 1, the multiplexing device 19, and the separating device 29 are installed at a high place such as on a steel tower or the roof of a building.
6, a multiplexing device 26, a reception signal processing device 11, and a transmission signal processing device 21 are installed. Both are connected by an optical fiber cable 32 via electrical / optical converters 18 and 27 and optical / electrical converters 17 and 28.

The signal received by the antenna 1a is
The signal is amplified by the low noise amplifier 1c via the duplexer 1b. The receiver 1g demodulates the received signal to generate a baseband signal. This baseband signal is sampled by an analog / digital converter 1i and converted into a digital signal. Similarly, a signal received by another antenna is also demodulated and digitized by another wireless device such as the wireless device 2 to be a baseband signal. These N-sequence digital baseband signals are combined into a single-sequence digital signal by a multiplexer 19, converted into a modulated optical signal by an electric / optical converter 18, and indoors by an optical fiber cable 32. It is transmitted to.

This signal is converted back to an electric signal by the optical / electrical converter 17, and is again converted into an N-series digital signal by the separating device 16. This is subjected to digital signal processing by the reception signal processing device 11 and the required reception signal 10
Is obtained. The signal 20 to be transmitted is converted by the transmission signal processing device 21 into an N-sequence digital signal corresponding to each antenna and wireless device. These are combined into a series of digital signals by the multiplexer 26, converted into optical signals by the electrical / optical converter 18, and transmitted by the optical fiber cable 32.

This optical signal is converted back to an electric signal by the optical / electrical converter 28, and is again converted into an N-series digital signal by the separating device 29. These are input to N wireless devices including the wireless device 1. In the wireless device 1, an input digital signal is converted into an analog signal by a digital / analog converter 1j, and a high-frequency signal modulated by a transmitter 1h is generated. This is amplified by the power amplifier 1d and transmitted from the antenna 1a via the duplexer 1b. Similarly, in other wireless devices such as the wireless device 2,
A high-frequency signal is generated based on the signal from the separation device 29, amplified, and transmitted from the antenna.

In this embodiment, signals are exchanged between wireless devices by multiplexed digital signals and connected by only two optical fibers, so that it is easy to lay cables. There are advantages.
Further, similarly to the first embodiment, the resistance to lightning damage is high.

[0022]

As described above, according to the present invention, from a high place such as the roof of a building in which a group of wireless devices including an antenna is installed, the inside of a building in which other wireless devices are housed. There is no need to lay a large amount of coaxial cable, and the effect of simple construction is obtained. Further, since the connection between the devices is made by an optical fiber, there is an effect that the resistance to lightning damage is high. In addition, since a coaxial cable is used for high-power transmission, there is no problem of distortion due to optical / electrical conversion and electrical / optical conversion.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the invention according to claims 1 and 2;

FIG. 2 is a block diagram showing an embodiment of the invention of claim 3;

FIG. 3 is a block diagram showing a first configuration example according to the related art.

FIG. 4 is a block diagram showing a second configuration example according to the related art.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K002 AA01 AA02 AA03 AA04 BA03 FA01 GA02 5K067 AA41 BB02 CC24 EE02 EE10 EE23 EE37 KK02 KK03

Claims (3)

[Claims] 1. A first wireless device comprising: a first high-output wireless device installed outdoors; and a plurality of wireless devices installed outdoors and having a lower output than the first high-output wireless device. A second wireless device installed indoors and having a second high-output wireless device; and a plurality of wireless devices installed indoors and having a lower output than the second high-output wireless device. A multi-core optical fiber cable for connecting a corresponding one of the wireless devices of the first wireless device group and the corresponding wireless devices of the second wireless device group, respectively; A wireless device comprising a pair of transmitting and receiving coaxial cables connecting the device and the second high power wireless device. 2. Each of the wireless devices of the first wireless device group includes an antenna, a duplexer connected to the antenna,
A low-noise amplifier for amplifying a reception signal from the duplexer, an electric / optical converter for converting an output signal of the low-noise amplifier into an optical signal and supplying the optical signal to one core of the multi-core optical fiber cable; An optical / electrical converter for converting an optical signal from one core wire of the multi-core optical fiber cable into an electric signal, amplifying the electric signal from the optical / electrical converter, and outputting the amplified signal to the duplexer Each of the wireless devices of the second wireless device group comprises: an optical / electrical converter for converting an optical signal from one core wire of the multi-core optical fiber cable into an electric signal; / A receiver for demodulating an electric signal from the electric converter, and a transmitter,
An electric / optical converter that converts an output signal of the transmitter into an optical signal and supplies the optical signal to one core wire of the multi-core optical fiber cable, wherein the first high-power radio device includes an antenna, A duplexer connected to the antenna, and a low-noise amplifier that amplifies a signal received from the duplexer and supplies the amplified signal to the coaxial cable for reception. The second high-power radio device supplies a signal to the duplexer, the second high-power radio device demodulates a reception signal from the reception coaxial cable, a transmitter, and amplifies an output signal of the transmitter to transmit the signal to the transmission device. The wireless device according to claim 1, further comprising a power amplifier that supplies the coaxial cable. 3. A first wireless device group comprising a plurality of wireless devices provided outdoors, a first multiplexer for multiplexing output signals of the first wireless device group, and a first multiplexer thereof. A first electrical / optical converter for converting an output signal of the multiplexer to an optical signal, a first optical / electrical converter for converting an optical signal to an electrical signal, and demultiplexing the converted electrical signal The first
A first separation device that supplies as an input signal of the wireless device group; a transmission signal processing device that processes a plurality of indoor transmission signals and outputs the signal as a signal corresponding to each wireless device of the wireless device group; A second multiplexer for multiplexing the output signal of the transmission signal processor, a second electrical / optical converter for converting the output signal of the second multiplexer to an optical signal, A second optical / electrical converter for converting the electric signal, a second demultiplexer for demultiplexing the converted electric signal,
A reception signal processing device that processes a signal separated by the second separation device and outputs a plurality of reception signals; the first electric / optical converter; and the second optical / electric converter. A wireless device comprising: a first optical fiber cable to be connected; and a second optical fiber cable to connect the first optical / electrical converter and the second electrical / optical converter.