发明授权
US09042426B1 Wireless communication system 有权
无线通信系统

Wireless communication system
摘要:
A wireless communication system includes a mobile device carried by a user and an in-vehicle apparatus equipped to a vehicle and communicatively connected with the mobile device. The in-vehicle apparatus includes a transmission unit, a transmission control unit, a reception determination unit, and a position determination unit. The transmission unit transmits low-frequency band request signals generated by spread modulating transmission data with predetermined spreading factors. The transmission control unit controls the transmission unit to generate and transmit first and second request signals having first and second attainable ranges by spread modulation using first and second spreading factors, respectively. The reception determination unit performs reception determination to response signal transmitted from the mobile device in response to the request signal. The position determination unit specifies the first attainable range or the second attainable range as a mobile device position area in response to a reception determination result.
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