JPS61171242A - Time division multiple access device - Google Patents

Abstract

PURPOSE:To supply power to a radio reception section installed outdoor and having difficulty in power supply without increasing the number of signal lines by detecting a DC voltage superposed from a signal processing section upon a radio transmission/reception section to obtain a power. CONSTITUTION:An output main signal (a) converted into a CMI code by a CMI coder 1-1 in a base band signal processing section 1 is transmitted to a signal line 3 via a transformer 1-5 and a capacitor 1-6. A DC voltage of an output (b) is superimposed on a signal of a signal line 3 in a DC power supply superimposing circuit 1-2. On the other hand, the signal (a) incoming via the signal line 3 is separated from a DC by a capacitor 2-8 and a transformer 2-7 in a radio transmission/reception section 2, goes to an input main signal (g) of the transmission reception section 2, the signal (g) is demodulated by a CMI decoder 2-3. Further, an input (h) to a DC detection circuit 2-4 is used as a power source to the transmission/reception section 2 by the circuit 2-4.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a time division multiple access device in which a master station and a plurality of slave stations are connected in a time division manner using radio burst signals of the same frequency. In particular, CMI (Cod@d Mark I
The present invention relates to a time division multiple access device using a balanced code such as an Nversion code.

[Conventional technology]

Conventionally, in a time division multiple access device in which a master station and multiple slave stations are time-divisionally connected using wireless burst signals of the same frequency, signals transmitted and received are transmitted between a baseband signal processing unit and a wireless transmitting/receiving unit. In addition to the wire, a configuration in which a power line to the wireless transmitter/receiver and an alarm line from the wireless transmitter/receiver are physically interfaced is common and rare.

[Problem that the invention seeks to solve]

In the conventional time division multiple access device described above, in addition to the transmitting and receiving signal lines between the baseband signal processing unit and the wireless transmitting/receiving unit, the power supply line to the wireless transmitting/receiving unit and the message line from the wireless transmitting/receiving unit are physically inked. 7 ace configuration, the proportion of the connection cable and its facility construction cost in the system cost cannot be ignored, especially as the distance between the baseband signal processing section and the wireless transmitter/receiver section becomes longer. The proportion of the connection cable and its facility construction costs in the system cost has increased significantly, which has been a major drawback in constructing a time division multiple access device that is inexpensive and easy to construct.

[Means for solving problems]

In view of the above points, the present invention has been made in order to solve such problems and eliminate such drawbacks.The present invention is aimed at wireless transmitting and receiving units that are installed outdoors and are often supplied with power through circuits. Power can be supplied without increasing the number of signal lines, and there is no need to install separate alarm signal lines.
To provide a time division multiple access device that is easy to maintain and can reduce cable and facility construction costs because it is possible to monitor wireless transmission/reception polarization alarms in a baseband signal processing unit installed indoors. be.

In order to achieve such an object, the present invention provides means for superimposing and transmitting a DC voltage for driving the wireless transmitting/receiving section onto the main signal line to the wireless transmitting/receiving section in the signal processing section; The wireless transmitter/receiver includes means for detecting a superimposed alarm from the signal processor, and the wireless transmitter/receiver has means for detecting the superimposed DC voltage from the signal processor to obtain a t source, and a main circuit for the signal processor. The signal line is provided with means for superimposing the signal from the radio transmitting/receiving section with direct current and transmitting the signal.

[Effect]

In the master station or slave station of a time division multiple access device in which the master station and slave stations are time-divisionally connected using radio burst signals of the same frequency, the interface signal between the baseband signal processing unit and the wireless transmitter/receiver unit is When using the α■ code, the baseband signal processing section superimposes a DC voltage for driving the wireless transmitting/receiving section on the main signal line to the wireless transmitting/receiving section and sends it out.

The wire transmitter/receiver section superimposes DC voltage on the alarm from the wireless transmitter/receiver section onto the main signal line to the baseband signal processing section and sends it out.The wireless transmitter/receiver section also detects the superimposed DC voltage from the baseband signal processing section. After receiving power, the baseband signal processing unit detects the superimposed alarm from the wireless transmitting/receiving unit.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

The figure is a block diagram showing one embodiment of the present invention.

In the figure, 1 indicates a baseband signal processing section (signal processing section), and 2 indicates a wireless transmitting/receiving section.

1-1 is a CMI encoder that converts the main signal into a balanced signal such as a CMI code and sends it out as main signal a, 1-2 is a DC power superimposition circuit that sends out a DC output signal, and 1-3 is an input main signal ( CMI decoder that decodes CMI code) C; 1-4 is an alarm detection circuit that detects the input alarm signal (DC) d; 1-
5.1-7 is a transformer, 1-6.1-8 is a capacitor, and these are included in the baseband signal processing section 1.

2-1 is an encoder that converts the main signal into a CMI code and sends it out as an output main signal e; 2-2 is an alarm superimposition circuit that sends out a congratulatory signal (DC) f indicating a failure of the wireless transmitter/receiver 2;
2-3 decodes the input main signal (cM code) g (goods)
A decoder, 2-4 is a DC detection circuit that detects the input (DC) f and uses it as a power source for the wireless transmitter/receiver 2, 2-5 and 2-7 are transformers, and 2-6 and 2-8 are capacitors. It is included in the wireless transmitting/receiving section 2.

3 is a signal IIJ (upward direction signal + I) from the baseband signal processing unit 1 to the wireless transmitting/receiving unit 2;
-6 and the CMI encoder 1-1 via the transformer 1-5, and are also connected to the DC power superimposing circuit 1-2;
7, it is connected to the α1 decoder 2-3, and also to the DC detection circuit 2-4. 4 is a signal line (downlink signal line) from the wireless transmitting/receiving section 2 to the baseband signal processing section 1; one side of this downlink signal line 4 is connected to the wireless transmitting/receiving section 2;
is connected to the encoder 2-1 via the capacitor 2-6 and transformer 2-5, and also to the alarm superimposition circuit 2-2, and the other is connected to the capacitor f1- of the baseband signal processing section 1.
8 and the truss 7 are connected to the CMI decoder 1-3 via the truss 1-7, and also to the alarm detection circuit 1-4.

Next, the operation of the embodiment shown in this figure will be explained.

First, the α1 encoder 1-1 in the baseband signal processing unit 1
The output main signal a converted into a CMI code by
2, a DC voltage of output (DC) b is superimposed on the upstream signal line 3.

On the other hand, in the wireless transmitter/receiver 2, the output main signal a from the α1 encoder 1-1 of the baseband signal processor 1, which has arrived via the upstream signal line 3, is
1 decoder 2-3. In addition, the input (DC) h to the DC detection circuit 2-4 is this DC detection circuit 2-4.
This becomes the power source for the wireless transmitting/receiving section 2.

Next, the output main signal e converted into an α■ code by the α1 encoder 2-1 in the wireless transmitter/receiver 2 is passed through a signal line (downward signal line) 4 via a transformer 2-5 and a capacitor 2-6.
In addition, the alarm superimposition circuit 2-2 sends an alarm signal (DC) f to the downstream signal line 4 indicating a fault in the wireless transmitter/receiver 2, for example, Ov1 in normal state, +1 in case of fault.
2V etc. are superimposed on the DC current.

On the other hand, in the baseband signal processing section 1, the main signal e from the CMI encoder 2-1 of the radio transmitting/receiving section 2, which has arrived via the downlink signal line 4, is converted into an alarm signal by a capacitor 1-8 and a transformer 1-7. (DC) f and becomes the input main signal C of the α■ decoder 1-3. This input main signal C is then decoded by a decoder 1-3. In addition, the alarm signal, that is, the input alarm signal d of the alarm detection circuit 1-4
is detected by this alarm detection circuit 1-4.

〔Effect of the invention〕
As explained above, according to the present invention, when a CMI code is used for the interface signal between the baseband signal processing unit and the wireless transmitting/receiving unit, by superimposing DC on each of the upstream and downstream signal lines, In other words, for example, by superimposing a power supply voltage on the upward signal line, it is possible to supply power to wireless transmitter/receivers, which are often installed outdoors and where it is difficult to supply power, without increasing the number of signal lines. In addition, by superimposing the alarm from the wireless transmitter/receiver 2 on the downstream signal line, the wireless transmitter/receiver 2 can be used in the baseband signal processing unit installed indoors without providing a separate alarm signal line. The practical effect is that it is possible to realize a time division multiple access device that is easy to maintain and can reduce cable and facility construction costs. It is extremely large.

[Brief explanation of drawings]

The figure is a configuration diagram showing an embodiment of the present invention. 1...Baseband signal processing section (signal processing section), 1
-1...Kyo encoder, 1-2...DC power superimposing circuit, 1-3...α■ decoder, 1-4...personal information detection circuit, 1-5. 1-7...Trans, 1-6
．． 1-8...Capacitor, 2...Wireless transmitting/receiving unit, 2-1...α! Encoder, 2-2...Alarm superimposition circuit, 2-3...α■ decoder, 2-4...DC detection circuit, 2-5.2-7...Transformer, 2-6
．． 2-8...Capacitor, 3,4...Signal line.

Claims (1)

[Claims] The master station and multiple slave stations are connected in a time-division manner using wireless burst signals of the same frequency, and the signal processing section and wireless transmitting/receiving section are arranged separately, and the interface signal includes CMI.
In a time division multiple access device using a balanced code such as a code, in the signal processing unit, means for superimposing and transmitting a DC voltage for driving the wireless transmitting and receiving unit on a main signal line to the wireless transmitting and receiving unit; means for detecting a superimposed alarm from the wireless transmitting/receiving section, in the wireless transmitting/receiving section, means for detecting the superimposed DC voltage from the signal processing section to obtain power; and a main circuit for the signal processing section. A time division multiple access device comprising: means for direct current superimposing and transmitting the alarm from the radio transmitter/receiver on a signal line.