Wireless transmitter and receiver for use in an ultra-wideband direct spread pulse communication system

A wireless receiver for use in an ultra-wideband direct spread pulse communication system, comprising:

• an antenna section for receiving an electronic wave signal and outputting the electronic wave signal to a first matched filter and a second matched filter;
• the first matched filter for receiving the electronic wave signal from the antenna section and outputting a first correlation output signal using a first spreading code with (2*N−1) chips when a reference signal for determining data is detected;
• the second matched filter for receiving the electronic wave signal from the antenna section and outputting a second correlation output signal using a second spreading code with (2*N−1) chips when a data signal is detected;
• a delay time measuring section for detecting which of the first and second correlation output signals from the first and second matched filters is first output and outputting a detection result;
• and
• a data determining section for receiving the detection result and determining if the data signal is in a first or second level of binary logic levels,
• 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, and (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, 0, 1, 0, 0, 1, 0, 1, −1, 0, 0, 1, 1 or 1, 1, 0, 0, −1, 1, 0, 1, 0, 0, 1, 0, −1 corresponding to a reversed code thereof, and the second spreading code is 1, 0, −1, 0, 1, −1, 1, 0, 0, 0, 0, 1, 1 or 1, 1, 0, 0, 0, 0, 1, −1, 1, 0, −1, 0, 1 corresponding to a reversed code thereof.

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 and less than 15, and
• wherein the first spreading code is 0, 1, 0, −1, 0, 1, 1, 0, 0, 0, −1, 1, −1 or −1, 1, −1, 0, 0, 0, 1, 1, 0, −1, 0, 1, 0 corresponding to a reversed code thereof, and the second spreading code is 0, 1, 0, 0, 1, 1, 1, 0, −1, 0, 0, −1, 1 or 1, −1, 0, 0, −1, 0, 1, 1, 1, 0, 0, 1, 0 corresponding to a reversed code thereof.

A wireless receiver for use in an ultra-wideband direct spread pulse communication system, comprising:

• an antenna section for receiving an electronic wave signal and outputting the electronic wave signal to a first matched filter and a second matched filter;
• the first matched filter for receiving the electronic wave signal from the antenna section and outputting a first correlation output signal using a first spreading code with (2*N−1) chips when a reference signal for determining data is detected;
• the second matched filter for receiving the electronic wave signal from the antenna section and outputting a second correlation output signal using a second spreading code with (2*N−1) chips when a data signal is detected;
• a delay time measuring section for detecting which of the first and second correlation output signals from the first and second matched filters is first output and outputting a detection result;
• and
• a data determining section for receiving the detection result and determining if the data signal is in a first or second level of binary logic levels,
• 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, and (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, −1, 0, 0, 0, 1, 1, 0, −1, 0, 1, 0 or 0, 1, 0, −1, 0, 1, 1, 0, 0, 0, −1, 1, −1 corresponding to a reversed code thereof, and the second spreading code is 1, 1, 0, 0, −1, 0, 1, 1, 1, 0, 0, 1, 0 or 0, 1, 0, 0, 1, 1, 1, 0, −1, 0, 0, −1, 1 corresponding to a reversed code thereof.