Patent Number: 7,088,683

Title: Communication system and device under OFDM system

Abstract: Communication between a stationary terminal such as an on-road terminal and a mobile terminal mounted on an automotive vehicle is performed under an OFDM system. Before transmitting data signals from the mobile terminal to the stationary terminal, a control signal indicating the number of sub-carries used in the data transmission is sent to the stationary terminal. The number of sub-carriers is decreased in accordance with increase of the moving speed to avoid deterioration in communication quality due to the moving speed increase. A modification formula and/or an error-correction-code coding rate used in the data transmission may be varied according to the moving speed in place of or together with varying the number of sub-carriers.

Inventors: Sawada; Manabu (Yokohama, JP), Kuwabara; Masahiro (Yokosuka, JP)

Assignee: DENSO Corporation

International Classification: H04J 1/16 (20060101); H04B 7/208 (20060101)

Expiration Date: 8/08/02018