Patent ID: 7292619
Filing Date: 2007-11-06
Classification: H04B

Abstract:
1. A method for acquiring a received impulse radio signal in an impulse radio signal channel used by a plurality of users, comprising: receiving a transmitted impulse radio signal represented by where d j are binary random variables, take values of ±1 with a probability of ½, w tr is a transmitted unit-energy pulse, T f is an average pulse repetition time, T c is a chip interval, N f is the number of pulses representing one information symbol, and b is an information symbol transmitted, either zero or one: assigning a pseudo-random sequence [c to express the transmitted impulse radio signal as when T f /T c =N c , wherein Nc is number of chips so that the received impulse radio signal is expressed as where w rec (t) is a received pulse, and σ n n(t) is white Gaussian noise with unit power spectral density, and b j k /N N =1∀j, and the number cells in the region is N=N f N c , and T c is a minimum resolvable path interval; searching, with respect to time, a region of the received impulse radio signal by correlating the region with a first template signal to locate a block including a signal cell, in which correlations with the first template signal are delayed by a time interval substantially greater than a chip interval, and in which the first template signal is expressed as where m j is the number of pulses over a first correlation interval associated with the region, B is a total number of blocks in the region, each block including K cells, and N=KB; and searching, with respect to time, the block using a second template signal to locate the signal cell to acquire the received impulse radio signal.