Peak-to-average power ratio reduction in a multicarrier signal

A method comprising:

• receiving with a receiver a signal sent by at least one transmitter via a transmission channel,
• said signal being formed from a temporal succession of symbols including a set of subcarriers, sent simultaneously and comprising pilot subcarriers dedicated to at least one processing operation for assisting and/or improving decoding in the receiver and data subcarriers,
• the location in time-frequency space and a reference value of said pilot subcarriers being known to the receiver,
• the reference value of at least one subset of said pilot subcarriers being modified, for a given symbol, by correction data correcting phase and/or amplitude of each of said pilot subcarriers of said subset, so as to minimise peak-to-average power ratio,
• said correction data taking at least three distinct correction values, a transition between the correction values of two successive pilot subcarriers in said subset on the frequency axis being constant, and wherein the transition is predetermined according to a multiplicative or additive transition law;
• extraction of information received modulating each of the subcarriers of said subset of carriers;
• analysing all said information received, so as to determine an estimation of said correction data;
• and
• estimating the transmission channel from said correction data.

A device comprising:

• a receiver configured to receive a signal sent by at least one transmitter via a transmission channel,
• said signal being formed by a temporal succession of symbols including a set of subcarriers, sent simultaneously and comprising pilot subcarriers dedicated to at least one processing operation assisting and/or improving decoding in the receiver, and data subcarriers,
• the location in time-frequency space and a reference value of said pilot subcarriers being known to the receiver,
• the reference value of at least one subset of said pilot subcarriers dedicated to a channel estimation being modified, for a given symbol, by correction data correcting the phase and/or amplitude of each of said pilot subcarriers of said subset, so as to minimise peak-to-average power ratio,
• said correction data taking at least three distinct correction values, a transition between the correction values of two successive pilot subcarriers of said subset on a frequency axis being constant, and wherein the transition is predetermined according to a multiplicative or additive transition law;
• means for extracting received information modulating each of the subcarriers of said subset of carriers;
• means for analysing all said information received, so as to determine an estimation of said correction data;
• and
• means for estimating the transmission channel from said correction data.

A computer program product recorded on a non-transitory medium that can be read by computer, wherein the product comprises program code instructions for implementing a method of receiving a signal sent by at least one transmitter via a transmission channel, when the instructions are executed on a computer,

• said signal being formed from a temporal succession of symbols including a set of subcarriers, sent simultaneously and comprising pilot subcarriers dedicated to at least one processing operation for assisting and/or improving decoding in a receiver and data subcarriers,
• the location in time-frequency space and a reference value of said pilot subcarriers being known to the receiver,
• the reference value of at least one subset of said pilot subcarriers being modified, for a given symbol, by correction data correcting phase and/or amplitude of each of said pilot subcarriers of said subset, so as to minimise peak-to-average power ratio,
• said correction data taking at least three distinct correction values, a transition between the correction values of two successive pilot subcarriers in said subset on the frequency axis being constant, and wherein the transition is predetermined according to a multiplicative or additive transition law,
• wherein the method comprises:
• extraction of information received modulating each of the subcarriers of said subset of carriers;
• analysing all said information received, so as to determine an estimation of said correction data;
• and
• estimating the transmission channel from said correction data.