Method to reduce peak to average power ratio in multi-carrier modulation receivers
A method for performing channel estimation in an orthogonal frequency division multiplexing (OFDM) signal includes choosing reserved tones to be part of a pilot pattern, and using the reserved tones in the pilot pattern to perform the channel estimation. An apparatus for use in performing channel estimation in an OFDM system includes a receiver configured to receive a transmitted OFDM signal; a pilot symbol extractor configured to extract pilot symbols from the OFDM signal; and a channel estimator configured to perform the channel estimation, including using reserved tones as pilot tones.
1. A method for performing channel estimation on an orthogonal frequency division multiplexing (OFDM) signal, comprising:
choosing reserved tones to be part of a pilot pattern, wherein the choosing includes:
using a projection of signal peaks onto the reserved tones to produce a reduction signal; and
using the reduction signal for peak canceling to lower a peak to average power ratio; and
using the reserved tones in the pilot pattern to perform the channel estimation.
2. The method according to claim 1 , wherein the choosing includes using predetermined reserved tone values.
3. The method according to claim 1 , wherein the choosing includes dynamically determining reserved tone values.
4. The method according to claim 3 , wherein the reserved tone values are dynamically determined via an iterative process during a receiver initialization process.
5. The method according to claim 1 , wherein the channel estimation is performed in a receiver configured to receive the OFDM signal.
6. An apparatus for use in performing channel estimation on an orthogonal frequency division multiplexing (OFDM) system, comprising:
a receiver configured to receive a transmitted OFDM signal;
a pilot symbol extractor configured to extract pilot symbols from the OFDM signal; and
a channel estimator configured to:
choose reserved tones to be part of a pilot pattern;
use a projection of signal peaks onto the reserved tones to produce a reduction signal;
use the reduction signal for peak canceling to lower a peak to average power ratio; and
use the reserved tones in the pilot pattern to perform the channel estimation.
7. A non-transitory computer-readable storage medium storing a set of instructions for execution by a general purpose computer to perform a method for providing channel estimation on an orthogonal frequency division multiplexing (OFDM) signal, the set of instructions comprising:
a choosing code segment for choosing reserved tones to be part of a pilot pattern, wherein the choosing code segment includes:
a first using code segment for using a projection of signal peaks onto the reserved tones to produce a reduction signal; and
a second using code segment for using the reduction signal for peak canceling to lower a peak to average power ratio; and
a third using code segment for using the reserved tones in the pilot pattern to perform the channel estimation.
8. The computer readable medium according to claim 7 , wherein the choosing code segment includes using predetermined reserved tone values.
9. The computer readable medium according to claim 7 , wherein the choosing code segment includes dynamically determining reserved tone values.
10. The computer readable medium according to claim 9 , wherein the choosing code segment further includes dynamically determining the reserved tone values via an iterative process during a receiver initialization process.