Wireless communication device and system

Abstract

A wireless communication device having a control section configured to control transmission and reception of a wireless signal by an antenna in conformity with a designated communication standard, wherein the control section controls a timing of causing the antenna to transmit a second signal in response to a first signal received by the antenna, on a basis of fixed time and delay time related to internal transfer in the wireless communication device, the fixed time being decided in advance.

1 . A wireless communication device comprising
 a controller that controls transmission and reception of a wireless signal by an antenna in conformity with a designated communication standard,   wherein the controller controls a timing of causing the antenna to transmit a second signal in response to a first signal received by the antenna, on a basis of fixed time and delay time related to internal transfer in the wireless communication device, the fixed time being decided in advance, and   wherein, after the antenna receives the first signal, the controller waits for a time obtained by subtracting, the delay time from the fixed time, and then starts a transmission process of the second signal,   wherein the controller calculates the delay time, which is a time from when a digital signal generated by the controller is converted into an analog signal as input to the antenna to when the analog signal outputted from the antenna is converted into a digital signal as input to the controller.   
     
     
         2 . The wireless communication device according to  claim 1 ,
 wherein the fixed time is used for calculating propagation time of the first signal and the second signal between the wireless communication device and another wireless communication device that transmits the first signal.   
     
     
         3 . The wireless communication device according to  claim 1 ,
 wherein the propagation time of the first signal and the second signal is used for estimating a distance between the wireless communication device and another wireless communication device that transmits the first signal.   
     
     
         4 . The wireless communication device according to  claim 1 ,
 wherein the designated communication standard includes ultra-wideband wireless communication.   
     
     
         5 . The wireless communication device according to  claim 1 ,
 wherein the wireless communication device is carried by a user.   
     
     
         6 . The wireless communication device according to  claim 1 , further comprising:
 a digital-to-analog converter that converts the digital signal generated by the controller into the analog signal as input to the antenna.   
     
     
         7 . The wireless communication device according to  claim 1 , further comprising:
 an analog-to-digital converter that converts the analog signal outputted from the antenna into the digital signal as input to the controller.   
     
     
         8 . A wireless communication device comprising
 a controller that controls transmission and reception of a wireless signal by an antenna in conformity with a designated communication standard,   wherein the controller calculates propagation time of a first signal and a second signal between the wireless communication device and another wireless communication device on a basis of fixed time and delay time related to internal transfer in the wireless communication device, the first signal being transmitted from the antenna, the second signal being transmitted from the other wireless communication device in response to the first signal, the fixed time being decided in advance, and   wherein, after the antenna receives the first signal, the controller waits for a time obtained by subtracting the delay time from the fixed time, and then starts a transmission process of the second signal,   wherein the controller calculates the delay time, which is a time from when a digital signal generated by the controller is converted into an analog signal as input to the antenna to when the analog signal outputted from the antenna is converted into a digital signal as input to the controller.   
     
     
         9 . The wireless communication device according to  claim 8 ,
 wherein the controller calculates the propagation time of the first signal and the second signal between the wireless communication device and the other wireless communication device by subtracting the delay time from a time from start of a transmission process of the first signal to confirmation of reception of the second signal and further subtracting the fixed time from the subtracted time.   
     
     
         10 . The wireless communication device according to  claim 8 ,
 wherein the wireless communication device is installed in a mobile object.   
     
     
         11 . The wireless communication device according to  claim 8 , further comprising:
 a digital-to-analog converter that converts the digital signal generated by the controller into the analog signal as input to the antenna.   
     
     
         12 . The wireless communication device according to  claim 8 , further comprising:
 an analog-to-digital converter that converts the analog signal outputted from the antenna into the digital signal as input to the controller.   
     
     
         13 . A system comprising:
 a first wireless communication device; and   a second wireless communication device,   wherein the first wireless communication device includes a first controller that controls transmission and reception of a wireless signal by a first antenna in conformity with a designated communication standard,   the first controller calculates propagation time of a first signal and a second signal between the first wireless communication device and the second wireless communication device on a basis of fixed time and first delay time related to internal transfer in the first wireless communication device, the first signal being transmitted from the first antenna, the second signal being transmitted from the second wireless communication device in response to the first signal, the fixed time being decided in advance, wherein, after the first antenna receives the first signal, the first controller waits for a time obtained by subtracting the first delay time from the fixed time, and then starts a transmission process of the second signal, wherein the first controller calculates the first delay time, which is a time from when a digital signal generated by the first controller is converted into an analog signal as input to the first antenna to when the analog signal outputted from the first antenna is converted into a digital signal as input to the controller,   the second wireless communication device includes a second controller that controls transmission and reception of a wireless signal by a second antenna in conformity with a designated communication standard, and   the second controller controls a timing of causing the second antenna to transmit the second signal in response to the first signal received by the second antenna, on a basis of the fixed time and second delay time related to internal transfer in the second wireless communication device.