Patent ID: 8023595
Filing Date: 2011-09-20
Classification: H04B,H04L,H04W,Y02D

Abstract:
1. A method for estimating the time-of-arrival (TOA) of a received signal transmitted over a channel according to a multi-band orthogonal frequency division multiplexing scheme, comprising: recovering an impulse response for the channel using a least-square method with regard to a measurement of the received signal; and reconstructing the impulse response using taps spaced apart by a tap interval, wherein each tap has a unique tap index and is delayed by a fixed tap delay value, wherein the reconstruction includes: a) with the fixed tap delay value equaling zero, determining a tap index approximating, a time for a first arriving path of the recovered signal; and b) refining the approximation by varying the fixed tap delay value between zero and the tap interval to find a determined delay value that substantially minimizes the energy leakage of the first arriving path of the recovered channel, wherein the time-of-arrival (TOA) equals a delay for the determined tap index with the fixed tap delay value equaling the determined delay value, and wherein finding the determined delay value comprises calculating an energy ratio.