Granted Patent B2

US 8,340,205 · App. 12/598,544 · Granted Dec 25, 2012

Abstract

Claims (31)

1. A method of correcting a linear error phase of an OFDM signal, the method comprising:

selecting a synchronization point with a synchronization module;

evaluating a back-off for the synchronization point with a correction module, wherein the back-off corresponds to a delay in a cyclic prefix of the OFDM signal; and

offsetting, with the correction module, a rotation of the OFDM signal using the back-off value.

2. The method of claim 1 , wherein the offsetting includes adapting each OFDM symbol of the OFDM signal to offset the rotation of the OFDM signal using the back-off value.

3. The method of claim 2 , wherein the adapting of each OFDM symbol is performed using the following equation:

S ci =S i xe jθi

where:

θ =dx 2 π/N

and:

S ci is the adapted OFDM symbol value;

S i is the original OFDM symbol;

d is the back-off; and

i is a subcarrier index relative to Direct Current.

4. An apparatus for correcting linear error phase of an OFDM signal, the apparatus comprising:

a synchronization module to select a synchronization point; and

a correction module to:

evaluate a back-off for the synchronization point, wherein the back-off corresponds to a delay in a cyclic prefix of the OFDM signal, and

offset a rotation of the OFDM signal using the back-off value.

5. The apparatus of claim 4 , wherein the correction module corrects the OFDM signal with a correction vector to form a corrected signal.

6. The apparatus of claim 5 , further comprising an interpolation module for interpolating the corrected signal.

7. The apparatus of claim 6 , wherein the correction module adapts each of the OFDM symbols so as to de-rotate the signal.

8. The apparatus of claim 7 , wherein the correction module adapts each of the OFDM symbols of the signal using the following equation:

S ci =S i xe jθi

where:

θ =dx 2 π/N

and:

S ci is the adapted OFDM symbol value;

S i is the original OFDM symbol;

d is the back-off; and

i is a subcarrier index relative to Direct Current.

Assignments (8)