JPH06311082A - Radio communication machine - Google Patents

Abstract

PURPOSE:To stabilize communication, lowering power consumption, by making a radio communication machine have a function lowering a transmission output when an S/N ratio is excellent and raising the transmission output within the legitimate range of a radio law when the S/N ratio is not excellent. CONSTITUTION:The signal from the side of an opposite station is received by the side of the station in use and the level adjusting signal within a reception signal is detected in a level adjusting signal detection circuit 5. This level adjusting signal contains the output level when radio wave is transmitted from the side of the station in use to the side of the opposite station as data, the side of the station in use controls the amplification degree of an amplifier 3 by this signal via a control circuit 14 and a transmission level is adjusted. At the same time, when the level of the reception signal is too high or too low, the level adjusting signal is outputted from a level adjusting signal generation circuit 11 to adjust the transmission output on the side of the opposite station and the side of the opposite station is made to adjust the output level of the transmission signal as the side of the station in use adjusts. Therefore, the output level is adjusted by dividing it into some stages, an S/N ratio is maintained within a normal value and a communication can be performed by efficient power consumption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a wireless communication device for a mobile body, and is used in a place where an automobile phone, a mobile phone, etc. are frequently used, and in the vicinity of a large television or radio repeater. The present invention relates to a wireless communication device that stabilizes communication by changing the level within the regulation range of the Radio Law.

[0002]

2. Description of the Related Art The following are examples of wireless communication systems with noise countermeasures.

(1) A method in which a circuit for transmitting both FM and AM waves is provided on the transmission side, and the reception side receives FM waves when the S / N ratio is good and AM waves when the S / N ratio is poor. (Japanese Patent Laid-Open Publication No. 61-114625).

(2) A radio communication device provided with a switch on the transmitter side for manually switching the transmission output between two levels of "Hi" and "Lo".

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention (1) In Japanese Patent Laid-Open No. 61-114625, it is difficult to downsize a wireless communication device because the circuit scale becomes large by using two waves of AM and FM. In addition, it is necessary to obtain two waves of permission to use radio waves, which is a troublesome procedure.

(2) As the power control function, since the transmission output is simply selected from either "Hi" or "Lo", the transmission output cannot be finely adjusted, and the transmission output can be manually switched. Therefore, the operation is troublesome.

[0007]

The wireless communication system of the present invention adopts the following method to achieve the above object.

The signal from the partner station is received by the local station, and the level adjustment signal in the received signal is detected by the level adjustment signal detection circuit. This level adjustment signal contains the output level when transmitting radio waves from the local station to the other station side as data, and the local station controls the amplification level of the amplifier via the control circuit by this signal, and the transmission level is adjust. If the level of the received signal is too high or too low at the same time, the level adjustment signal is output from the level adjustment signal generation circuit to adjust the transmission output of the other station, and the other station sends it to itself. The output level of the transmission signal is adjusted as adjusted by the above method. By incorporating such a circuit, stable communication can be performed with only one wave without using two waves, and the output level can be adjusted in several stages to keep the S / N ratio within the specified value. Therefore, communication can be performed with more efficient power consumption than before.

[0009]

In FIG. 1, during reception, since the press talk switch 17 is in the off state, the transmission / reception mode switching circuit 2 is in the reception mode, and the reception signal input from the antenna 1 is output to the RF amplifier 3. The RF amplifier 3 amplifies the received signal, and then the decoder 4 separates it into a carrier wave and received data. Subsequently, the level adjustment signal detection circuit 5 reads the level adjustment signal information in the received data, and the control circuit 14 controls the amplification degree of the carrier frequency power amplifier 16. Further, the received data is output to the S / N ratio detection circuit 6, the S / N ratio detection circuit 6 detects the S / N ratio of the received data, and this information controls the level adjustment signal generation circuit 11. The level adjustment signal generating circuit 11 outputs a signal having the amount of adjustment of the transmission level of the other station as data, and this signal is stored in the temporary memory 12. In addition to the above operation, the received data is amplified by the audio power amplifier 7 and converted into voice by the speaker 8.

When transmitting from another station to the other station, the press talk switch 17 is turned on, the voice is converted into an electric signal by the microphone 9 and amplified by the audio frequency amplifier 10. Since the input end of the input switching circuit 13 is connected to the audio amplifier 10 when the press talk switch 17 is in the ON state, only the audio information converted into the electric signal is first output to the amplitude modulator 15. After the voice information is modulated by the amplitude modulator 15, the carrier frequency power amplifier 16 amplifies it to a required power level, and the amplified information is transmitted through the transmission / reception mode switching circuit 2. When the press talk switch 17 is turned off after the call, the input end of the input switching circuit 13 is stored in the memory 12.
, The level adjustment signal in the memory is read out, and the transmission / reception mode switching circuit 2 is maintained in the transmission mode for a short time. At this time, the level adjustment signal is transmitted through the input switching circuit 13 through the same route as the voice information.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

A case where the wireless communication device A receives a radio wave from the wireless communication device B will be described. At this time, the press talk switch 17 of the wireless communication device A is in the off state, the transmission / reception mode switching circuit 2 is in the reception mode, and the reception signal from the antenna 1 is output to the RF amplifier 3. RF amplifier 3
The signal is amplified to a required level with and output to the decoder 4. Next, the decoder 4 separates the received signal into carrier waves and received data, extracts the received data consisting of voice information and a level adjustment signal, and then the level adjustment signal detection circuit 5 adjusts the transmission level of the wireless communication device A. Read the level adjustment signal. According to the information at this time, the amplification degree of the carrier frequency power amplifier 16 when the radio communication device A transmits a radio wave to the radio communication device B via the control circuit 14, that is, the transmission level is controlled. Further, the S / N ratio detection circuit 6 detects the S / N ratio of the received data, and outputs the level adjustment signal from the level adjustment signal generation circuit 11 according to the difference from the preset reference value of the S / N ratio. generate. This signal is for adjusting the transmission output of the wireless communication device B, and when the signal is transmitted from the wireless communication device A to the wireless communication device B, it is transmitted after the voice information and notified to the partner station. Level adjustment signal detection circuit 5, S / N
The received data passed through the ratio detection circuit 6 is the audio power amplifier 7
And is converted into voice by the speaker 8. Next, a case of transmitting from the wireless communication device A to the wireless communication device B will be described.

First, the press talk switch 17 is turned on, the voice is converted into an electric signal by the microphone 9, and the audio amplifier 10 amplifies it to a required level. The voice information converted into the electric signal is modulated by the amplitude modulator 15 via the input switching circuit 13. The modulated signal is
It is amplified by the carrier frequency power amplifier 16 controlled by the control circuit 14 and transmitted through the transmission / reception mode switching circuit 2 in the transmission mode state. When the call ends and the press talk switch 17 is turned off, the input end of the input switching circuit 13 is connected to the memory 12, the level adjustment signal in the memory 12 is read, and the transmission / reception mode switching circuit 2 transmits for a short time. Maintained in mode. At this time, the level adjustment signal is transmitted to the partner station.

Then, the method of transmitting the level adjustment signal, S / N
Specific examples of the configurations of the ratio detection circuit, the level adjustment signal generation circuit, the level adjustment signal detection circuit, and the control circuit are shown below.

1. Transmission method of level adjustment signal (1) When transmitting the level adjustment signal, there is a possibility that the surrounding noise level exceeds the transmission level and the level adjustment signal cannot be transmitted to the other station side. The level adjustment signal is transmitted with the maximum output within the range of the Radio Law.

(2) A function of transmitting a confirmation signal when the level adjustment signal is received, that is, a response function is incorporated. If the local station first notifies the level adjustment signal at the normal transmission level, and if the local station does not receive the confirmation signal from the other station side, gradually raise the transmission level of the level adjustment signal within the range of the Radio Law. Go.

2. Configuration of S / N ratio detection circuit (1) When digital communication is performed, a fixed pattern signal is transmitted at regular intervals, and a bit error is detected when this pattern signal is read by another station.

(2) A method of detecting the S / N ratio by comparing the signal level and the noise level when the local station receives a signal from the other station when analog communication is performed.

3. Configuration of level adjustment signal generation circuit and level adjustment signal detection circuit A threshold value is set in the S / N ratio reading section in the level adjustment signal generation circuit by dividing the reference value into upper and lower stages, and the S / N ratio value is The level adjustment signal is changed depending on the range. When the level adjustment signal is output, the synchronization signal is first output, and then the 4-bit binary data is output. In the level adjustment signal detection circuit, first, the reading start position of the level adjustment signal is determined by the synchronization signal, and then 4-bit binary data is read.

4. Configuration of Control Circuit The control circuit reads 4-bit binary data read by the level adjustment signal detection circuit, and the amplification degree of the carrier frequency power amplifier is controlled in several stages by this value.

As described above, according to this embodiment, communication can be performed with low power consumption when the S / N ratio is good, and communication can be stabilized by increasing the S / N ratio when the S / N ratio is poor. As a result, It is possible to perform stable wireless communication while reducing power consumption.

[0022]

According to the present invention, in the wireless communication device, S /
By providing the function of lowering the transmission output when the N ratio is good and increasing the transmission output within the range of the Radio Law when the S / N ratio is poor, there is an effect that power consumption can be reduced and communication can be stabilized.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of an embodiment of the present invention.

[Explanation of symbols]

 1 ... Antenna, 2 ... Transmission / reception mode switching circuit, 3 ... RF amplifier, 4 ... Decoder, 5 ... Level adjustment signal detection circuit, 6 ... S / N ratio detection circuit, 7 ... Audio power amplifier, 8 ... Speaker, 9 ... Microphone, 10 ... Audio amplifier, 11 ... Level adjustment signal generating circuit, 12 ... Memory, 13 ... Input switching circuit, 14 ... Control circuit, 15 ... Amplitude modulator, 16 ... Carrier frequency power amplifier, 17 ... Presstalk switch.

Claims (1)

[Claims] 1. In a mobile radio communication device, an S / N ratio detection circuit for detecting the S / N ratio of a received radio wave is provided on the local station side.
A level adjustment signal generation circuit that outputs a signal that adjusts the transmission power level of the partner station based on the judgment result of the / N ratio, a partner station side a level adjustment signal detection circuit that detects this level adjustment signal, from the own station side A radio communication device comprising a control circuit for controlling the amplification degree of a final stage amplifier by an output level adjustment signal, and adjusting a transmission output level according to a judgment result of an S / N ratio of a received radio wave.