Back to results
US 2004/0174925 A1Published application
UWB transmitter and receiver
AssigneeKeio University
InventorYukitoshi Sanada
Life of this patent
Estimating the term…
Abstract
[Object] The present invention provides a UWB transmitter and receiver, the transmission rate of which is increased, and the SN ratio of which is improved. [Solution Means] By investigating the polarity of an echo at ½ position of the chip period Tc, the chip period is shortened to Tc/2 where the polarity of the echo is the same and a pulse signal of the same polarity is continued, whereby it becomes possible to increase the transmission rate. Since the echo and the pulse signal are caused to overlap each other, the SN ratio can be improved.
Claims6
A UWB transmitter comprising:
- an echo detector for detecting the polarity of an echo at the position of the second chip period that is shorter than the first chip period which is the original chip period in advance;
- and
- a pulse generator for generating a pulse at the second chip period when generating a pulse of the same polarity as that of the immediately preceding pulse and generating a pulse at the first chip period when generating a pulse of the inverse polarity to that of the immediately preceding pulse where the echo detected by said echo detector has the same polarity, and for generating a pulse at the first chip period when generating a pulse of the same polarity as that of the immediately preceding pulse and generating a pulse at the second chip period when generating a pulse of the inverse polarity to that of the immediately preceding pulse where the echo detected by said echo detector has the inverse polarity.
A UWB receiver comprising:
- an echo detector for detecting the polarity of an echo at the position of the second chip period that is shorter than the first chip period which is the original chip period in advance;
- a pulse generator for generating a pulse at the second chip period when generating a pulse of the same polarity as that of the immediately preceding pulse and generating a pulse at the first chip period when generating a pulse of the inverse polarity to that of the immediately preceding pulse where the echo detected by said echo detector has the same polarity, and for generating a pulse at the first chip period when generating a pulse of the same polarity as that of the immediately preceding pulse and generating a pulse at the second chip period when generating a pulse of the inverse polarity to that of the immediately preceding pulse where the echo detected by said echo detector has the inverse polarity;
- and
- a correlator for correlating a pulse train from said pulse generator and a received signal.
1 more element
Dependencies are inferred from the claim text.