JPH04196625A - Radio signal changeover device - Google Patents

Abstract

PURPOSE:To eliminate the need for a MODEM and to facilitate the maintenance by converting a high frequency signal into an optical signal by an electrooptic converter, selecting the signal and restoring the signal into an electric signal after changeover. CONSTITUTION:A signal received by antennas 1,101 is distributed respectively by distributers 3,103 and the distributed signal is subject to electrooptic conversion by electrooptic converters 37,137 via band pass filters 4,104 whose pass band frequencies differ one by one wave each. An optical signal is connected to optoelectric converters 41,141 corresponding to a required channel by an optical switch 40 and the high frequency signal subject to optoelectric conversion is converted into a required frequency by frequency converters 44,144. Thus, the signal changeover, the high frequency signal changeover or broad band signal changeover are attained with a simple device and the device is made small and the maintenance is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a line switching device in a wireless relay station.

[Prior Art] Conventionally, a line switching device having a configuration as shown in FIG. 6 has been used in a wireless relay station.

The signal received on antenna 1.101 is converted to an intermediate frequency in receiver 2.102. The intermediate frequency signal is passed through a bandpass filter 4.10 to n carriers that are multiplexed.
Divided by 4. The separated signals are sent to demodulators 7-9.
Demodulation is performed at 107 to 109. After demodulating, it is switched by a baseband switch 10 and modulated by modulators 11 and 111. The modulated waves are combined by a combiner 20.120,
Transmitted via antenna 22.122.

[Problem to be solved by the invention] In the conventional system, switching is performed in the baseband band, so -
It was necessary to first demodulate the signal and convert it to baseband. Also, after demodulating and switching, it had to be modulated again. This type of switching method requires a modem,
There was a problem that maintenance was complicated.

[Means for Solving the Problems] The present invention converts a high frequency signal into an optical signal using an electrical/optical converter, switches it using an optical switch, and returns it to an electrical signal after switching. The above problem can be solved because the switching is performed without any changes.

[Operation] FIG. 1 shows the switching method of the present invention. The four carriers A to D are each converted into an optical signal by an electric/optical converter 37. This output optical signal is switched to a predetermined output terminal by an optical switch 40 and output. Those optical signals are converted back into electrical signals and become high frequency signals. Note that this high frequency signal is converted to a required frequency. This frequency conversion may be performed before switching with an optical switch.

As described above, the high frequency output is D, A, as shown in Figure 2.
They can be rearranged like B and C.

Although this method requires optical switches, electrical/optical converters, and optical/electrical converters, it does not require modulation/demodulation equipment that is complicated to adjust, difficult to maintain, and uneconomical, and is compact and has low power consumption. It becomes possible to

Embodiment FIG. 2 is a block diagram of an embodiment of claim (1).

Signals received by antennas 1 and 101 are distributed by distributors 3 and 103, respectively. The distributed signals are passed through bandpass filters 4.104 with different passband frequencies to electrical/
Electrical/optical conversion is performed by an optical converter 37.137. The optical signal is connected by a 6×6 optical switch 40 to an optical/electrical converter 41S 141 corresponding to the required channel. The high frequency signals converted by those optical/electrical converters are transferred to a frequency converter 4.
4.144 to the required frequency. Then, unnecessary frequency components are removed by a bandpass filter 47.147, and the signals are combined by a multiplexer 20.120. The multiplexed signals are converted into necessary power by transmitters 21 and 121 and radiated from antennas 22 and 122.

FIG. 3 is a block diagram of an embodiment of claim (2).

The signal received by the receiver 2.102 via the antenna 1.101 is processed by
The signals are converted to lower intermediate frequencies and distributed by a distributor 3.103. The distributed signals are subjected to electrical/optical conversion by electrical/optical converters 37.137 one wave at a time through bandpass filters 4.104 having different passband frequencies. Optical signal is 6x6
The optical switch 40 is connected to the optical/electrical converter 41.141 corresponding to the required channel. The high frequency signals converted by those optical/electrical converters are transferred to frequency converters 44.14.
4, it is converted to the required frequency. Then, unnecessary frequency components are removed by a bandpass filter 47.147, and the signals are combined by a multiplexer 20.120. The combined signal is converted into the necessary power by the transmitter 21.121 and sent to the antenna 22.
．． 122.

FIG. 4 is a block diagram of an embodiment of claim (3).

The signals received by the antenna 1.102 and converted into intermediate frequencies are distributed by the distributor 3.103. The distributed signals are passed through bandpass filters 4 with different passband frequencies.
Divided into waves. and frequency converter 644.74
4 to convert to a predetermined frequency. Then, unnecessary frequency components are removed by bandpass filters 647, 747, and electrical/optical conversion is performed by electrical/optical converters 37, 137. The optical signals are connected by a 6×6 optical switch 40 to optical/electrical converters 41.141 corresponding to the required channels. The high frequency signals converted by those optical/electrical converters are sent to a multiplexer 20
．． The signals are combined at 120. The combined signal is sent to the transmitter 21.
121, it is converted into the necessary electric power and radiated from the antenna 22.122.

FIG. 5 is a block diagram of an embodiment of claim (4).

received by receiver 2.102 via antenna 1.101,
In order to facilitate implementation of a bandpass filter in the subsequent stage, the signals converted to intermediate frequencies are distributed by distributors 3.103. The distributed signals are divided into individual waves by bandpass filters 647 and 747 having different passband frequencies. Then, it is converted to a predetermined frequency by frequency converters 644 and 744. and bandpass filter 647.747
Unnecessary frequency components are removed by the electric/optical converter 37.137 for electric/optical conversion. The optical signals are connected by a 6×6 optical switch 40 to optical/electrical converters 41.141 corresponding to the required channels. The high frequency signals converted by these optical/electrical converters are combined by multiplexers 20 and 120. The combined signal is converted into necessary power by a transmitter 21121 and radiated from an antenna 22.122.

[Effects of the Invention] As explained above, according to the present invention, signals can be switched with a simple device. Furthermore, since an optical switch is used for switching, it is possible to switch high frequency signals and extremely wideband signals. Furthermore, the device can be realized in a small size and is easy to maintain.

[Brief explanation of the drawing]

FIG. 1 is a diagram explaining the principle and operation of the present invention. FIG. 2 is a block diagram of an embodiment of claim (1) of the present invention. FIG. 3 is a block diagram of an embodiment of claim (2) of the present invention. FIG. 4 is a block diagram of an embodiment of claim (3) of the present invention. FIG. 5 is a block diagram of an embodiment of claim (4) of the present invention. FIG. 6 is a configuration diagram of a line switching device in a conventional wireless relay station. l, 101-receiving antenna 2, l 02-receiver 3.103...distributor 4.104--receiving side band-pass filter 7, l O7-
Demodulator 10 - Optical switch 11.111 - Modulator 20.120 - Combiner 21.121 - Transmitter 22.122 Transmitting antenna 37.137 - Electrical/optical converter 41.141 - Optical/electrical converter 44 .144-RF band frequency converter

Claims (4)

[Claims] (1) A wireless communication signal switching device that uses n carriers includes n bandpass filters that separate the received signal into individual waves, and n bandpass filters that convert the outputs of the bandpass filters into optical signals. an electrical/optical converter; an n×n optical switch that receives and switches outputs of the n electrical/optical converters;
n which takes the output of an optical switch as input and converts it into an electrical signal.
an optical/electrical converter, n frequency converters that take the output of the optical/electrical converter as input and convert that frequency into a predetermined frequency, and an unnecessary frequency that takes the output of the n frequency converter as input. A wireless signal switching device comprising: a filter for removing components. (2) The radio signal switching device according to claim (1), further comprising n frequency conversion means before the n band-pass filters. (3) In a device that switches signals in equipment that performs wireless communication using n carriers, there are n bandpass filters that divide the received signal into one wave, and the output of the bandpass filter is used as input to switch the signal. n frequency converters that convert the frequency to a predetermined frequency, a filter that takes the outputs of the n frequency converters as input and removes unnecessary frequency components, and n electrical/converters that convert the filter outputs into optical signals. an optical converter; an n×n optical switch that takes the outputs of the n electrical/optical converters as input and switches them; and n optical/electrical converters that take the outputs of the n optical switches as input and switch them into electrical signals; A wireless signal switching device comprising: (4) The radio signal switching device according to claim (3), characterized in that n frequency conversion means are provided before the n bandpass filters.