Patent ID: 7630428
Filing Date: 2009-12-08
Classification: H04B,H04L

Abstract:
1. A method for determining frequency error of a serial offset quadrature pulse shaped signal, the method comprising the steps of: receiving, by a receiver, the serial offset quadrature pulse shaped signal having a synchronization sequence; detecting, by the receiver, synchronization of the quadrature pulse shaped signal; storing, in a memory, a baseband inphase (I) signal and a baseband quadrature (Q) signal of the synchronization sequence while detecting synchronization; reading, from the memory, segments of the stored baseband I and Q signals after detecting synchronization; correlating, by the receiver, the read segments with a spreading sequence; determining, by the receiver, phase differences between each of the correlated segments; and estimating, by the receiver, the frequency error based on the determined phase differences.