Patent ID: 8009718
Filing Date: 2011-08-30
Classification: H04B,H04J

Abstract:
1. A wireless transmitter for use in an ultra-wideband direct spread pulse communication system, comprising: a delay time controller for generating a periodic pulse, outputting the periodic pulse to a first matched filter, outputting the periodic pulse to a second matched filter when data to be transmitted is in a first level of binary logic levels, and outputting the periodic pulse to a third matched filter when the data to be transmitted is in a second level of the binary logic levels; the first matched filter for outputting a reference signal for determining data using a first spreading code with (2*N−1) chips when the periodic pulse is input; the second matched filter for outputting a first data signal earlier than the reference signal by a predetermined time using a second spreading code with (2*N−1) chips when the periodic pulse is input; and the third matched filter for outputting a second data signal later than the reference signal by a predetermined time using the second spreading code when the periodic pulse is input, wherein (2*N−2)-th and (2*N)-th values of a cross-correlation signal between the first spreading code and the second spreading code are greater than 0, (2*N−3)-th and (2*N+1)-th values of an auto-correlation signal of the first spreading code are less than 0, (2*N−3)-th and (2*N+1)-th values of an auto-correlation signal of the second spreading code are less than 0, and wherein N is an integer greater than 1 and less than 15, and wherein the first spreading code is 1, 1, 0, 0, −1, 1, 0, 1, 0, 0, 1, 0, −1 or −1, 0, 1, 0, 0, 1, 0, 1, −1, 0, 0, 1, 1 corresponding to a reversed code thereof, and the second spreading code is 1, 1, 0, 0, 0, 0, 1, −1, 1, 0, −1, 0, 1 or 1, 0, −1, 0, 1, −1, 1, 0, 0, 0, 0, 1, 1 corresponding to a reversed code thereof.