Window position optimization for pilot-aided OFDM system

1. A method of reducing aliasing in an orthogonal frequency division multiplexing (OFDM) system, the method comprising:

receiving a signal including a transmission parameter signaling (TPS) signal;

determining a first channel estimate based on the TPS signal;

receiving a continuous pilot signal;

determining a second channel estimate based on the continuous pilot signal;

selecting a first window in which to capture a channel impulse response, wherein the window minimizes a difference between the first channel estimate and the second channel estimate;

determining a channel impulse response based on the first window; wherein the selecting is performed to capture the channel impulse response to prevent aliasing;

selecting a second window in which to capture a channel impulse response;

determining a second channel impulse response based on the selected second window;

selecting between the first and second windows as a preferred window; and

determining a channel impulse response based on the preferred window.

2. The method of claim 1 , further comprising:

shifting the channel impulse response into the selected window.

3. The method of claim 1 , wherein the OFDM system is a digital video broadcasting-terrestrial (DVB-T) system.

4. The method of claim 1 , wherein the OFDM system is a integrated services digital broadcasting-terrestrial (ISDB-T) system.

5. The method of claim 1 , wherein the first pilot signal is a transmission and multiplexing configuration control (TMCC) signal.

6. An orthogonal frequency division multiplexing (OFDM) receiver, the OFDM receiver comprising:

receiving a signal including a transmission parameter signaling (TPS) signal;

determining a first channel estimate based on the TPS signal;

receiving a continuous pilot signal;

determining a second channel estimate based on the continuous pilot signal;

a synchronization and channel estimation (SCE) block configured to receive a signal including a transmission parameter signaling (TPS) signal and to determine a first channel estimate based on the TPS signal, to receive a continuous pilot signal and to determine a second channel estimate based on the continuous pilot signal;

the SCE block further configured to select a first window in which to capture a channel impulse response, wherein the window minimizes the difference between the first channel estimate and the second channel estimate, wherein the SCE block is further configured to determine a channel impulse response based on the first selected window, and wherein the selecting is performed to capture the channel impulse response to prevent aliasing;

the SCE block is further configured to select a second window in which to capture a channel impulse response; and

the SCE block further configured to determine a second channel impulse response based on the second selected window and to select between the first and second windows as a preferred window and then determine a channel impulse response based on the preferred window.

7. The OFDM receiver of claim 6 , wherein the SCE block is further configured to shift the channel impulse response into the selected window.

8. The OFDM receiver of claim 6 , wherein the OFDM system is a digital video broadcasting-terrestrial (DVB-T) system.

9. The OFDM receiver of claim 6 , wherein the OFDM system is a integrated services digital broadcasting-terrestrial (ISDB-T) system.

10. The OFDM receiver of claim 6 , wherein the first pilot signal is a transmission and multiplexing configuration control (TMCC) signal.

11. A machine readable storage medium having a stored set of instructions executable by a machine, the instructions when executed are adapted to perform operations comprising:

receiving a signal including a transmission parameter signaling (TPS) signal;

determining a first channel estimate based on the TPS signal;

receiving a continuous pilot signal;

determining a second channel estimate based on the continuous pilot signal;

selecting a first window in which to capture a channel impulse response, wherein the window minimizes a difference between the first channel estimate and the second channel estimate;

determining a channel impulse response based on the first window; wherein the selecting is performed to capture the channel impulse response to prevent aliasing;

selecting a second window in which to capture a channel impulse response;

determining a second channel impulse response based on the selected second window;

selecting between the first and second windows as a preferred window; and

determining a channel impulse response based on the preferred window.

12. A computer-readable medium containing a first set of instructions adapted to create a processor, wherein the processor is configured to implement a second set of instructions, the second set of instructions comprising:

instructions to receive a signal including a transmission parameter signaling (TPS) signal, to determine a first channel estimate based on the TPS signal, to receive a continuous pilot signal and to determine a second channel estimate based on the continuous pilot signal;

the computer-readable medium further comprising instructions to select a first window in which to capture a channel impulse response, wherein the window minimizes the difference between the first channel estimate and the second channel estimate;

the computer-readable medium further comprising instructions to determine a channel impulse response based on the first window; wherein the selecting is performed to capture the channel impulse response to prevent aliasing;

the computer-readable medium further comprising instructions to select a second window in which to capture a channel impulse response; and

the computer-readable medium further comprising instructions to determine a second channel impulse response based on the second selected window and to select between the first and second windows as a preferred window and then determine a channel impulse response based on the preferred window.