| 摘要 |
<p>The delay estimation apparatus (34) according to this invention comprises: a correlator (41) which generates a correlation function between a received signal and a supplied template waveform; an AD (analog to digital) converter (42) which samples said correlation function generated at said correlator into discrete samples; and an arithmetic operation section (43) which obtains time delays of multipath components of said received signal based on said discrete samples generated at said AD converter, wherein said arithmetic operation section includes an iteration procedure where in each iteration, the time delay and the amplitude of the strongest signal component are estimated based on the present sample sequence, and said sample sequence is updated by deducting the estimated strongest component from said sample sequence; said iteration is terminated when a termination criterion is satisfied. Specifically, in each said iteration, said amplitude estimate of said strongest component is given by the maximum likelihood (ML) solution. The delay estimation apparatus according to this invention can be adopted for the first arrival detection or wireless ranging.</p> |
