Claims
- 1. A radio system comprising:a transmission section including a modulation section for producing a modulation signal; a gain controller which controls a transmission output, a power amplification section for amplifying a transmission signal to a desired level, and an antenna; and a receiving section including: an antenna; a frequency converter which converts into an intermediate frequency a high-frequency signal received by way of the antenna; a demodulation section which demodulates the intermediate frequency; a decode section which converts a demodulated signal into digital data; and a receiving rate detector which detects a receiving rate for each of frames of a received signal.
- 2. A transmitter comprising:a modulation section which produces a modulation signal; a gain controller which controls a transmission output; a power amplification section which amplifies a transmission signal to a desired level; and an antenna, wherein the gain controller varies the transmission output on the basis of a receiving rate for each frame determined when a receiver receives a transmission signal.
- 3. The transmitter as described in claim 2, wherein the gain controller includes a data setting device and a voltage-controlled amplifier, and can freely change a communication area by means of variation of an amplification gain.
- 4. The transmitter as described in claim 2, wherein the gain controller includes a data setting device and a voltage-controlled attenuator, and can freely change a communication area by means of variation of an attenuation.
- 5. The transmitter as described in claim 2, wherein the antenna has a function of adjusting the angle at which the antenna is disposed, by means of the receiving rate and can freely change a communications area by means of changing the angle.
- 6. A receiver comprising:an antenna for receiving a radio wave transmitted from a transmitter; a frequency converter which converts into an intermediate frequency a high-frequency signal received by way of the antenna; a demodulation section which demodulates the intermediate frequency; decode section which converts the demodulated signal into digital data; and receiving rate detector which detects a receiving rate for each of frames of the received signal, wherein a communications area can be freely changed by means of changing a transmission output of the transmitter on the basis of the receiving rate for each frame detected by the receiving rate detector.
Priority Claims (6)
Number |
Date |
Country |
Kind |
11-184170 |
Jun 1999 |
JP |
|
11-191818 |
Jul 1999 |
JP |
|
11-191837 |
Jul 1999 |
JP |
|
11-201732 |
Jul 1999 |
JP |
|
11-202226 |
Jul 1999 |
JP |
|
11-240217 |
Aug 1999 |
JP |
|
Parent Case Info
The present application is a division of application Ser. No. 09/603,248 filed on Jun. 26, 2000.
US Referenced Citations (5)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0751626 |
Jan 1997 |
EP |
10-163745 |
Jun 1998 |
JP |
10-214359 |
Aug 1998 |
JP |
10-261120 |
Sep 1998 |
JP |