Channel estimation of orthogonal frequency division multiplexed systems
Methods and apparatus, including computer program products, are provided for channel estimation. In one aspect, there is provided a receiver including a demodulator for decoding a signal including at least one of a transmission parameter signaling (TPS) carrier and a data carrier. The receiver further includes a channel estimator, coupled to the demodulator, for determining a channel estimate for the TPS carrier. Moreover, the receiver includes an interpolator, coupled to the channel estimator, for determining, based on the determined channel estimate for the TPS carrier, another channel estimate for the data carrier. Related systems, methods, and articles of manufacture are also disclosed.
1. A method comprising:
receiving a signal including one or more carriers, at least one of the carriers including a transmission parameter signaling (TPS) carrier, a pilot carrier, and a data carrier;
determining a TPS channel estimate for the TPS carrier;
if a pilot channel estimate can be obtained based on the pilot carrier, determining a data channel estimate for the data carrier, based on the determined TPS channel estimate and the pilot channel estimate; or
if a pilot channel estimate cannot be obtained based on the pilot carrier, determining a data channel estimate for the data carrier based on the determined TPS channel estimate.
2. The method of claim 1 , wherein determining the data channel estimate further comprises:
determining the data channel estimate for the data carrier by interpolation.
3. The method of claim 1 , wherein receiving further comprises:
receiving the signal as at least one of a coded orthogonal frequency division multiplexed signal and a orthogonal frequency division multiplexed signal.
4. The method of claim 1 , wherein receiving further comprises: receiving the signal as a coded orthogonal frequency division multiplexed signal to provide a digital video broadcast.
5. The method of claim 1 wherein receiving further comprises:
receiving the signal as a coded orthogonal frequency division multiplexed signal to provide a digital video broadcast.
6. A receiver comprising:
a demodulator configured to decode a signal including one or more carriers, at least one of the carriers including a transmission parameter signaling (TPS) carrier, a pilot carrier and a data carrier;
a channel estimator, coupled to the demodulator, configured to determine a TPS channel estimate for the TPS carrier; and
an interpolator, coupled to the channel estimator, configured to determine a data channel estimate for the data carrier based on:
the determined TPS channel estimate and a pilot channel estimate, if a pilot channel estimate can be obtained based on the pilot carrier, or
the determined TPS channel estimate if a pilot channel estimate cannot be obtained based on the pilot carrier.
7. The receiver of claim 6 , wherein the demodulator further comprises:
an orthogonal frequency division multiplexing (OFDM) demodulator for decoding an OFDM signal; and
a decoder for the TPS carrier.
8. The receiver of claim 7 , wherein the channel estimator further comprises:
a scattered pilot channel estimator, coupled to the orthogonal frequency division multiplexing demodulator, configured to determine a scattered pilot channel estimate of a scattered pilot included in the received signal; and
a TPS channel estimator, coupled to the orthogonal frequency division multiplexing demodulator, configured to determine the TPS channel estimate.
9. The receiver of claim 8 , wherein the channel estimator further comprises:
a continuous pilot channel estimator, coupled to the orthogonal frequency division multiplexing demodulator, configured to determine a continuous pilot channel estimate of a continuous pilot included in the received signal.
10. The receiver of claim 7 , wherein the channel estimator further comprises:
a continuous pilot channel estimator, coupled to the orthogonal frequency division multiplexing demodulator, configured to determine a channel estimate of a continuous pilot included in the received signal; and
a TPS channel estimator, coupled to the orthogonal frequency division multiplexing demodulator, configured to determine the TPS channel estimate of the TPS signal included in the TPS carrier.
11. The receiver of claim 6 , wherein the interpolator further comprises:
an interpolator, coupled to the channel estimator, for determining another channel estimate for the data carrier based on a non-linear interpolation.
12. The receiver of claim 6 , wherein the demodulator further comprises:
a decoder for decoding the signal received as at least one of a coded orthogonal frequency division multiplexed signal and a orthogonal frequency division multiplexed signal.
13. The receiver of claim 6 , wherein the demodulator further comprises:
a decoder for decoding the signal as a coded orthogonal frequency division multiplexed signal of a digital video broadcast.
14. A computer-readable medium containing instructions to configure a processor to perform a method, the method comprising:
receiving a signal including one or more carriers, at least one of the carriers including a transmission parameter signaling (TPS) carrier, a pilot carrier, and a data carrier;
determining a TPS channel estimate for the TPS carrier;
if a pilot channel estimate can be obtained based on the pilot carrier, determining a data channel estimate for the data carrier, based on the determined TPS channel estimate and the pilot channel estimate;
if a pilot channel estimate cannot be obtained based on the pilot carrier, determining a data channel estimate for the data carrier based on the determined TPS channel estimate.
15. The computer-readable medium of claim 14 , wherein determined the second channel estimate further comprises:
determining the data channel estimate for the data carrier by interpolation.
16. The computer-readable medium of claim 14 , wherein receiving further comprises:
receiving the signal as at least one of a coded orthogonal frequency division multiplexed signal and a orthogonal frequency division multiplexed signal.
17. The computer-readable medium of claim 14 , wherein receiving further comprises:
receiving the signal as a coded orthogonal frequency division multiplexed signal of a digital video broadcast.
18. A method comprising:
receiving a signal including one or more carriers, at least one of the carriers including a transmission parameter signaling (TPS) carrier, a continuous pilot carrier, a scattered pilot carrier, and a data carrier;
determining a TPS channel estimate for the TPS carrier;
attempting to determine pilot channel estimates for the continuous pilot carrier and the scattered pilot carrier;
determining a data channel estimate for the data carrier, based on:
the determined TPS channel estimate and any determined pilot channel estimates resulting from the attempting;
based on the determined TPS channel estimate if no pilot channel estimates result from the attempting.
19. The method of claim 18 wherein determining the data channel estimate further comprises:
determining the data channel estimate for the data carrier by interpolation.
20. The method of claim 18 wherein receiving further comprises:
receiving the signal as at least one of a coded orthogonal frequency division multiplexed signal and a orthogonal frequency division multiplexed signal.