Patent ID: 7889780
Filing Date: 2011-02-15
Classification: H04B,H04L

Abstract:
1. A method for estimating a Doppler spread and a signal-to-noise ratio of a signal, comprising: (a) Receiving the signal in a receiver to determine a carrier component of the signal; (b) Calculating loss in coherence of the carrier component at a first time point relative to a pilot signal embedded in the received signal; (c) Calculating loss in coherence of the carrier component of the received signal at a second time point relative to the pilot signal; (d) Repeating steps (b) and (c) over multiple time periods, each time period being longer than the second time, and accumulating the loss in coherence for the first time points and the second time points; and (e) Deriving the Doppler spread and the signal-to-noise ratio based on the accumulated loss in coherence calculated at the first and second time points.