Data transmission method with phase shift error correction

• US 8,054,924 B2
• Filed: 05/17/2005
• Issued: 11/08/2011
• Est. Priority Date: 05/17/2005
• Status: Active Grant

• Current Assignee: General Motors LLC (General Motors Company)
• Original Assignee: General Motors LLC (General Motors Company)
• Inventors: Madhavan, Sethu K.
• Primary Examiner(s): Payne; David C.
• Assistant Examiner(s): Perez; James M
• Application Number:
  US11/130,926
• Publication Number:
  US 20060262875A1
• Time in Patent Office: 2,366 Days
• Field of Search: 375/326, 375382-283, 375/226, 375/269, 375/268, 375279-285, 375329- 33, 375/362, 375/371, 375/375, 375259-260, 375/316, 375/354, 375/359, 375364-365, 375/368, 375/344, 375/346, 375349-350, 375327-337, 455/67.16, 455/276.1, 455/130, 455/296, 455303-304
• US Class Current: 375/350
• CPC Class Codes: H04L 25/0214 of a single coefficient
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 25/03019 adaptive, i.e. capable of adjustment during data reception
• CPC Class Codes: H04L 27/2275 wherein the carrier recovery circuit uses the received modulated signals

Abstract

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 received transmission signal; and correcting the received data signal component using the determined phase shift error.

Claims

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.