Patent ID: 7221215

Claim:
A PPM (pulse position modulated) signal demodulator for receiving and demodulating a PPM signal transmitted in an ultra wide band radio communication system using an ultra wide band, comprising: a rectifier for receiving and rectifying the PPM signal to obtain an absolute value signal; first, second and third integrating comparators for integrating the absolute value signals for first, second and third integral times, respectively, and comparing integrated values resultant from integration for respective lengths of integral times; a determining circuit connected to an output of said second integrating comparator for determining the PPM signal on a basis of an integrated and compared result by said second integrating comparator to output demodulated data; and a control circuit for generating first, second and third integral interval control signals for controlling the first, second and third integral times, respectively, on a basis of respective integrated and compared results in said first, second and third integrating comparators, whereby said first, second and third integrating comparators integrate the absolute value signals for the respective lengths of the first, second and third integral times associated with the first, second and third integral interval control signals.