Granted Patent B2

US 8,054,924 · App. 11/130,926 · Granted Nov 8, 2011

Assignee: General Motors LLC

Abstract

Claims (18)

1. A data transmission method with phase shift error correction comprising:

transmitting through a network a transmission signal, wherein the transmission signal comprises a reference signal component having a predetermined frequency and a data signal component;

receiving the transmission signal, wherein the received transmission signal includes a phase shift error caused by the network, wherein the phase shift error is in both the received reference signal component and the received data signal component;

generating a multiplier signal at a receiver having the predetermined reference frequency;

using the multiplier signal to determine the phase shift error in the reference signal component of the received transmission signal; and

subtracting the determined phase shift error from the data signal component having the phase shift error.

2. The method of claim 1 further comprising:

isolating the received reference signal component from the received data signal component; and

applying the multiplier signal to the received reference signal component.

3. The method of claim 2 further comprising:

providing a ninety-degree phase shift of the received reference signal component;

first multiplying the multiplier signal by the received reference signal component to determine a first multiplying result; and

second multiplying the multiplier signal to the ninety-degree phase shifted reference signal component to determine a second multiplying result.

4. The method of claim 3 further comprising:

first integrating the first multiplying result; and

second integrating the second multiplying result.

5. The method of claim 4 wherein the step of correcting comprises:

determining a ratio of the first and second integrations, wherein the determined phase shift error is responsive to the ratio.

Assignments (14)

Continuity (1)