Vehicle mounted DSRC apparatus

A vehicle mounted DSRC apparatus which uses a dedicated short range communications system of an intelligent transport system including ground devices, and which outputs an ASK modulated signal or a QPSK modulated signal in response to transmission data from one of said ground devices,

• said vehicle mounted DSRC apparatus comprising:
• an antenna for receiving transmission data from said ground devices, and for transmitting said ASK modulated signal and said QPSK modulated signal to said ground devices;
• an ASK data generation part for generating ASK data in response to said transmission data;
• a QPSK data generation part for generating QPSK data containing I data and Q data in response to said transmission data;
• a first band limiting filter for band limiting one of said I data and said Q data in said QPSK data and said ASK data;
• a second band limiting filter for band limiting the other of said I data and said Q data in said QPSK data;
• an ASK low pass filter for removing harmonic components from said ASK data which has passed through said first band limiting filter;
• a first low pass filter for removing harmonic components from said QPSK data which has passed through said first band limiting filter;
• a second low pass filter for removing harmonic components from said QPSK data which has passed through said second band limiting filter;
• an ASK modulator for ASK modulating said ASK data from said ASK low pass filter;
• a QPSK modulator for QPSK modulating said QPSK data from said first and second low pass filters;
• a power supply for supplying electric power to said ASK modulator and said QPSK modulator;
• and
• a power amplifier for amplifying output data from said ASK modulator or said QPSK modulator to a desired level thereby to output it to said antenna as said ASK modulated signal and said QPSK modulated signal.