JPS60204127A - Radio equipment for tdma - Google Patents

Abstract

PURPOSE:To improve the reliability of communication by turning on a gate suppressing a radio wave at application of power timewise later than other circuits and turning off timewise the gate of a transmitter at interruption of power than the other circuits earlier so as to prevent a spurious radio wave from being radiated at application and interruption of power. CONSTITUTION:The transmitter 6, a receiver 7 and a TDM logical circuit 5 are arranged, and the transmitter 6 is provided with a gate 61 turning on/off a transmission output to constitute a TDMA radio equipment. A power is applied to the transmitter 6, the receiver 7 and the logical circuit 5 of the equipment from a power supply circuit 9. Moreover, a double-throw power switch 10 comprising the 1st states 11a, 11b, the 2nd states 12a, 12b and the 3rd states 13a, 13b is provided between the circuit 9 and the power supply. Moreover, an AND gate 14 is provided among the 3rd state 13b, the logical circuit 5 and a gate 61 of the transmitter 61. Then the gate 61 is turned on later than the circuit 9 at application of power and turned off earlier at the interruption of power to prevent a spurious radio wave from being irradiated at application and interruption of power.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a wireless device applied to a TDMA communication system.

[Prior art]

The TDMA communication method is a method in which radio waves of the same frequency are time-divided and used by multiple stations, and in the case of ground-based private communication, it is used with a station configuration as shown in FIG. The master station and the plurality of slave stations are connected by time-division burst signals as shown in the time chart of FIG. In the figure, 1 is a reference master station, 2 is N slave stations that communicate with the master station in a time-sharing manner, 3 is a wide-angle beam antenna, and 4 is a normal parabolic antenna. Each slave station 2 uses the signal received from the master station 1 as a reference and transmits radio waves through the wide-angle beam antenna 3 by emitting radio waves in a burst through the parabolic antenna 4 during the time period assigned to each station. The radio waves reaching the master station 1 are arranged so that they do not overlap and become a - column signal sequence.

Therefore, in the case of "TDMA system," among each slave station.

-If a station were to emit radio waves at arbitrary times, it would interfere with the communications of other stations. For that reason.

Usually, a slave station is designed to stop transmitting to the master station when the reception wave from the master station is cut off. However, it is completely uncertain what initial value the circuit will start from. Also, when disconnecting, the power supply voltage slowly drops due to the discharge of the electrolytic capacitor.

The IC circuit temporarily enters an unstable operation region.

For this reason, the conventional technology has the disadvantage that there is a possibility that radio waves are emitted instantaneously at arbitrary timing and cause interference to other lines.

In the past, the TDMA system was often applied to satellite communications, where the scale of one communication station was generally large, and high reliability of 5% was required. Therefore, the radio equipment used had a backup system in addition to the current one, and there was no need to turn on or cut off the power to the communication equipment connected to the antenna. However, in terrestrial optical transmission communication in which only current equipment is used, power is turned on and off relatively frequently, which causes the above-mentioned inconvenience.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless device applied to a TDMA communication system that can prevent unnecessary radiation from an antenna when power is turned on and off.

[Structure of the invention]

According to the present invention, in a TDMA radio device having a transmitter, a receiver, and a TDMA logic processing circuit, the transmitter is provided with a gate that turns on and off its output signal, and a gate is provided in the transmitter to turn on and off the output signal, TDMA communication equipped with a power switch that can be switched to five different states: a first state, a second state in which only the gate of the transmitter is turned off, and a sixth state in which all circuits including the gate operate normally. A wireless device applied to the method is obtained.

The intention of the present invention is that when the power is turned on, the gate for suppressing radio waves is turned on later than other transceivers and TDMA logic processing circuits, and when the power is turned off, the gate of the transmitter is turned on later than other circuits. The point is that it is turned off first.

〔Example〕

Next, a wireless device according to the present invention will be described in detail with reference to the drawings.

FIG. 3 is a block diagram showing the configuration of an embodiment according to the present invention. In the figure, 5 is a TDMA logic processing circuit; 6 is a TDMA logic processing circuit;
7 is a transmitter, 7 is a receiver, 8 is a duplexer, and 9 is a power supply circuit. Further, 10 indicates two power switches. The transmitter 6 is equipped with a gate 61 that turns on and off its transmission output signal. The gate 61 is connected to the fund gate 14 which receives as input the reactor number which is incremented from the TDMA logic processing circuit 5 when it is in the operating state and the signal which is output when the power switch 10 is changed to a predetermined state. Turn on and off by output.

The power switch 10 is in the first state 11a, llbV
When C is present, the power supply to all circuits is even cut off. Then, the power switch 10 is set to the second state 1212b.
When tilted to the side, power is turned on to each part with the gate 61 in the off state, and C-frame synchronization with the signal from the master station is established. Thereafter, when the power switch 10 is turned to the third state 13a, 13b side, the gate 61 is turned on via the gate 14, and the transmission burst wave is emitted at the regular time position from the beginning.

Moreover, when the power supply is cut off, the sixth state 13
a, 13b to the second state 12a, 12b.

Finally, when the switch 10 is moved to the first states 11a and llb, the power supply to all circuits is cut off in the lla and llb states. At this time, the operation of the IC circuit of the TDMA logic processing circuit 5 also momentarily becomes abnormal, but the second
Since the gate 61 of the transmitter 6 is already turned off when the state shifts to states 12a and 12b, no radio wave is emitted as an unnecessary wave.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, interference with other lines can be prevented even when the power is turned on and off, thereby improving the reliability of the entire communication system.

+4, Brief explanation of the drawings Fig. 1 is a system diagram showing the layer structure of the TDMA system in terrestrial optical transmission communication, Fig. 2 is a format showing a time-division burst signal, and Fig. 6 is an implementation according to the present invention. FIG. 2 is a block diagram showing an example configuration.

Explanation of symbols = 1 is a master station as a reference, 2 is a slave station that communicates with the master station in a time-sharing manner, 3 is a wide-angle beam antenna, 4 is a normal parabolic antenna, 5 is a TDMA logic processing circuit, 6
is the transmitter and 7 is the receiver.

8 is a transmitter/receiver duplexer, 9 is a power supply circuit, 10 is a double power switch, 14 is an AND gate circuit, and 61 is a gate in the transmitter.

Figure 3

Claims (1)

[Claims] 1. In a TDMA radio device having a transmitter, a receiver, and a TDMA logic processing circuit, the transmitter is provided with a gate that turns on and off its output signal. Six different states: a first state in which power supply to all circuits is cut off, a second state in which only the gate of the transmitter is turned off, and a sixth state in which all circuits including the gate operate normally. 1. A TDMA wireless device characterized by comprising a power switch that can be switched to.