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US 6,650,278 B2Granted
Method and device for setting a communications area of a road antenna apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasaki Terashima, Yoshiteru Hirano, Makoto Takemoto, Akihiro Inui
Life of this patent
Estimating the term…
Abstract
A road antenna apparatus includes a road antenna 104 which is mounted on a post 103 and at an elevated position on a road R and establishes radio communication with an on-vehicle radio device 102 mounted in a vehicle 101 which is traveling over the road. A receiving rate of the established radio communication is detected. A transmission output is set based on detecting a suitable receiving rate for a desired communications area established between the transmitter and the receiver.
Claims6
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.
7 more elements
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 more elements
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.
4 more elements
Dependencies are inferred from the claim text.