Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
  • H04L25/03006—Arrangements for removing intersymbol interference
  • H04L25/03343—Arrangements at the transmitter end
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
  • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
  • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
  • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
  • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/0202—Channel estimation
  • H04L25/0204—Channel estimation of multiple channels
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/0202—Channel estimation
  • H04L25/0212—Channel estimation of impulse response
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
  • H04L25/03006—Arrangements for removing intersymbol interference
  • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
  • H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
  • H04L25/03006—Arrangements for removing intersymbol interference
  • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
  • H04L2025/03426—Arrangements for removing intersymbol interference characterised by the type of transmission transmission using multiple-input and multiple-output channels
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L25/00—Baseband systems
  • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
  • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
  • H04L25/03006—Arrangements for removing intersymbol interference
  • H04L2025/03777—Arrangements for removing intersymbol interference characterised by the signalling
  • H04L2025/03802—Signalling on the reverse channel

Definitions

• the present invention relates to a method for pre-equalizing a data signal, for example transmitted in a radio communication network based on a frequency division duplex (FDD) for "frequency division duplex".
• FDD frequency division duplex
• the communicating entities transmit data signals in separate frequency bands.
• the communicating entities are for example radio terminals, terrestrial or satellite base stations, or even radio access points.
• the invention relates to radio communication networks of the SISO type (for "Single Input, Single Output” in English), for which the communicating entities have a single antenna, the networks of the MIMO type (for "Multiple Input, Multiple Output” in English) for which the communicating entities have a plurality of antennas, and the networks combining communicating entities comprising an antenna and communicating entities with a plurality of SIMO antennas (for "Single Input, Multiple Output” in English) or MISO (for "Multiple Input, Single Output").
• a radio signal transmitted by an antenna of a communicating entity undergoes deformations as a function of the propagation conditions between an origin point defined at the output of the origin antenna and a destination point defined in input of an antenna of the destination communicating entity.
• the antenna signal is previously distorted by applying pre-equalization coefficients as a function of the characteristics of the propagation channel between these two antennas. It is therefore necessary to characterize this propagation channel.
• Time reversal is a technique of focusing waves, typically acoustic waves, based on time reversal invariance of the wave equation.
• a temporally reversed wave propagates like a direct wave that goes back in time.
• a brief pulse emitted from an origin point propagates in a propagation medium. Part of this wave received by a destination point is returned temporally before being returned to the propagation medium.
• the wave converges towards the origin point by reforming a brief pulse.
• the signal collected at the origin point is almost identical in its form to the original signal emitted at the origin point.
• the inverted wave converges all the more precisely as the propagation medium is complex.
• the temporal reversal of the propagation channel applied to the wave makes it possible to cancel the effect of this channel during the transmission of the wave thus pre-distorted from the point of origin.
• the technique of time reversal is thus applied to the radio communication networks to cancel the effect of the propagation channel on the antenna signal, in particular by reducing the spreading of the channel, and simplifying the processing of symbols received after crossing the channel.
• the antenna signal transmitted by an antenna of the source communicating entity is thus pre-equalized by applying coefficients obtained from the time reversal of the impulse response of the propagation channel that this antenna signal must pass through.
• the implementation of the time reversal thus requires knowledge of the propagation channel by the originating communicating entity in the frequency band dedicated to communications from this entity.
• the transmissions of a communicating entity, said source communicating entity, to a destination communicating entity and the transmissions in the opposite direction are performed in separate frequency bands.
• This is for example for a radio system, a transmission in a first frequency band of a mobile radio terminal to a base station, said transmission upstream, and a transmission in a second band of frequency from a base station to a mobile radio terminal, said downlink transmission.
• a communicating entity can estimate a propagation channel from the reception of a signal passing through it, it can not estimate a propagation channel from a signal transmitted in a different frequency band.
• the invention thus proposes an alternative solution offering a method of pre-equalization based on time reversal with reduced complexity and without the use of drivers.
• This solution is furthermore suitable for communicating entities with a single antenna for which the data signal is composed of a single antenna signal or for communicating entities with several antennas for which a data signal is composed of a plurality of antenna signals.
• the invention proposes a method of pre-equalizing a data signal transmitted in frequency duplexing by an originating communicating entity comprising a set of original antennas intended for a communicating entity receiving comprising a set of destination antennas.
• the method comprises:
• an iterative step of travel of the pulse comprising a sub-step of transmission by an origin antenna to the communicating entity receiving the pulse received by a reference antenna of the set of antennas of origin,. a sub-step of time reversal by the communicating entity receiving the combined impulse response representative of the successive crossing of the pulse through a first propagation channel between the destination antenna and the reference antenna and a second propagation channel between the originating antenna and the destination antenna,
• the complexity of the pre-equalization method according to the invention in the destination communicating entity is thus limited to the implementation of a time reversal of an impulse response.
• the method further comprises, in the transmitting sub-step of the received pulse, a selection of the reference antenna as a function of a set of pulses received by the set of antennas of origin.
• the selection of the reference antenna is for example made according to the energy of the pulses of all the pulses received by all the original antennas.
• This selection thus makes it possible to favor, for example, the second propagation channel in which the energy of the signal is the least attenuated.
• the pre-equalization coefficients are determined from a combination of a set of time-returned combined impulse responses received by the reference antenna of the originating communicating entity.
• the method thus makes it possible to adapt to different precoding and modulation methods applied to binary data generating a data signal comprising a plurality of antenna signals.
• the invention also relates to a device for the pre-equalization of a data signal for a source communicating entity comprising a set of original antennas, the original communicating entity being able to transmit in frequency duplexing the signal to a destination communicating entity comprising a set of destination antennas.
• the device comprises means for receiving a pulse transmitted by a destination antenna, means for transmitting an origin antenna of the received pulse to the destination communicating entity, means for receiving a combined impulse response , representative of a successive crossing the pulse transmitted through a first propagation channel between the destination antenna and a reference antenna of the set of antennas of origin and a second propagation channel between l original antenna and the destination antenna, turned over temporally, means for determining the pre-equalization coefficients of the data signal from a combination of a set of time-received returned combined impulse responses; transmitting and receiving being implemented iteratively for at least a part of all the destination antennas and at least a part of all the antennas of origin, the transmitting and receiving means being implemented iteratively for at least a part of all the destination antennas and at least a part of all the original antennas.
• the invention also relates to a device for the pre-equalization of a data signal for a destination communicating entity, comprising a set of destination antennas, the destination communicating entity being able to receive the data signal transmitted in frequency duplexing. by an origin communicating entity comprising a set of antennas of origin.
• the device comprises - means for transmitting by an antenna receiving a pulse to the source communicating entity, means for receiving a combined impulse response representative of a successive crossing of said pulse through a first propagation channel between the destination antenna and a reference antenna of the set of origin antennas and a second propagation channel between an origin antenna and the destination antenna, time reversal means the combined impulse response, means for transmitting said combined time-shifted combined impulse response, the transmission, reception and time reversal means being implemented iteratively for at least a part of the set of destination antennas and at least a part of the set of antennas of origin.
• the invention also relates to a communicating entity of a radio communication system comprising at least one of the devices for the pre-equalization of a data signal mentioned above.
• the invention also relates to a radio communication system comprising at least two communicating entities according to the invention.
• the devices, communicating entities and system have advantages similar to those previously described.
• FIG. 1 is a schematic block diagram of a source communicating entity communicating with a destination communicating entity according to the invention
• FIG. 2 represents the steps of the pre-equalization method of a data signal according to a particular embodiment.
• a communicating entity of origin EC1 is able to communicate with a destination entity EC2 through a radio communication network based on FDD frequency duplexing, not shown in the figure.
• the radio communication network is a cellular radio network of the UMTS type (for Uni versai Mobile Communication
• the communicating entities may be mobile radio terminals or even terrestrial or satellite base stations, or even access points.
• the transmissions from a base station to a mobile radio terminal, said uplink, are performed in a frequency band different from the frequency band dedicated to transmissions from a mobile radio terminal to a radio station. base, say downhill.
• the invention is presented for unidirectional transmission of a data signal of the communicating entity.
• the invention also relates to bidirectional transmissions.
• the communicating entity of origin EC1 comprises Ml original antennas (Al i, ... Al ref , .., Al 1 , AI MI ), with Ml greater than or equal to 1.
• the destination communicating entity comprises M2 receiving antennas (A2i, ... A2 j , A2 M2 ), with M2 greater than or equal to 1.
• the destination communicating entity EC2 is capable of transmitting a pulse or a radio signal from at least one of the antennas A2 J5 j lying between 1 and M2 , to the communicating entity of origin EC1 in a first band given frequency.
• a first propagation channel C1 (i ⁇ -j) is defined between the antenna A2 j of the communicating entity EC2 and an antenna A1, of the communicating entity of origin EC1.
• MlxM2 first propagation channels Cl (i ⁇ -j), for i varying from 1 to Ml and j varying from 1 to M2, are thus defined between the communicating entities EC1 and EC2.
• the source communicating entity EC1 is able to transmit a radio signal from at least one of the antennas A1 1, i between 1 and M1, to the destination communicating entity EC2 in a second frequency band. distinct from the first.
• a second propagation channel C2 (i- ⁇ j) is defined between the antenna Al 1 of the communicating entity EC1 and an antenna A2 j of the communicating entity of destination
• MlxM2 second propagation channels C2 (i-> j), for i varying from 1 to Ml and j varying from 1 to M2, are thus defined between the communicating entities EC1 and EC2.
• FIG. 1 are only represented means included in the source communicating entity and means included in the destination origin entity in relation to the invention.
• the communicating entities of origin and recipients further comprise a central control unit, not shown, to which the included means are connected, for controlling the operation of these means.
• the source communicating entity further comprises a data signal generator having Ml antenna signals.
• Such antenna signals are defined from binary data by modulation, coding and distribution methods on the Ml antennas, for example according to the article "Space block Coding: A single transmitter diversity technique for wireless communications", published in the IEEE review Journal areas communications, voll ⁇ ppl456-1458, in October, 998, authored by S. Alamouti.
• the source communicating entity comprises - a selective receiver SEL1 arranged to receive a pulse transmitted by the communicating entity EC2 on all of the original antennas and select a reference antenna from the received impulse responses, an EMET1 transmitter arranged to transmit an impulse response, delivered by the selective receiver SEL1, from an antenna of origin AIj, i between 1 and M1.
• the transmission is implemented after transposition of the impulse response on a carrier frequency f1 of the frequency band dedicated to the transmissions of the communicating entity EC1 to the communicating entity EC2, a receiver REC1 arranged to receive via the reference antenna a combined time-shifted combined impulse response transmitted by the destination communicating entity, a memory MEMl storing time-returned combined impulse responses delivered by the receiver REC1, a PEGA1 pre-equalizer arranged to determine pre-equalization coefficients from a combination of time-returned combined pulse responses or transfer functions stored in memory MEM1.
• the recipient communicating entity comprises a pulse generator GI2 arranged to emit a pulse from a destination antenna A2 ,, j between 1 and M2, on a carrier frequency f2 of the frequency band dedicated to the transmissions of the communicating entity EC2 to the communicating entity EC1, a REC2 receiver arranged to receive via a destination antenna a combined impulse response transmitted by the originating communicating entity, a RTEMP2 pulse analyzer arranged to return a combined impulse response delivered by the receiver REC2 temporally. , an emitter EMET2 arranged to emit a time-returned combined impulse response, delivered by the pulse analyzer, from a destination antenna after transposition on the carrier frequency f2.
• a pulse generator GI2 arranged to emit a pulse from a destination antenna A2 ,, j between 1 and M2, on a carrier frequency f2 of the frequency band dedicated to the transmissions of the communicating entity EC2 to the communicating entity EC1, a REC2 receiver arranged to receive via a destination antenna a combined impulse response transmitted by
• the method for pre-equalizing a data signal comprises steps E1 to E9, part of the steps being executed in the communicating entity of origin EC1, and the other party in the destination communicating entity EC2.
• the results of the steps are in this example described in the frequency domain but transposable directly in the time domain given the following definitions.
• a time pulse is defined by a function imp (t), a function of time t, whose transfer function is given by IMP (f), a function of frequency f.
• an impulse response is defined by a function ri (t), a function of time t, whose transfer function is given by RI (f), a function of frequency f.
• the convolution product of impulse responses corresponds to the product of the corresponding transfer functions.
• An impulse response ri (t) returned in time is denoted ri (-t), and the corresponding transfer function is RI (f) *, conjugated with the transfer function RI (f).
• steps E1 to E8 are repeated for at least part of the set of destination antennas.
• the iterations are symbolized by an initialization step INIT and a step IT1 of incrementation of the index j of the destination antennas A2 j .
• a iteration of steps E1 to E8 is thus described for a destination antenna A2 ,, j between 1 and M2.
• step E1 the pulse generator GI2 of the destination communicating entity generates the time pulse imp (t) whose corresponding transfer function is
• This pulse is emitted by the antenna A2 j on a carrier frequency f2 in the frequency band dedicated to the transmissions of the communicating entity EC2 to the communicating entity EC 1.
• the pulse is for example a raised cosine function of duration inversely proportional to the size of the frequency band in which the system operates for any type of access, for example of the OFDMA type (for "Orthogonal Frequency Division Modulation Access” in English), CDMA (for "Code Division Multiple Access” in English "), or TDMA (for" Time Division Multiple Access "in English).
• OFDMA Orthogonal Frequency Division Modulation Access
• CDMA Code Division Multiple Access
• TDMA Time Division Multiple Access
• the selective receiver SEL1 of the source communicating entity receives the pulse transmitted by the communicating entity EC2, on all the original antennas.
• the selective receiver determines a reference antenna from all the pulses received on all the original antennas. He makes this choice for example by comparing the energies received on the different antennas of origin and selects the impulse response of maximum energy.
• the selective receiver selects the antenna for which the impulse response received is the least spread over time.
• the selective receiver can also in another example choose an antenna randomly.
• the selective receiver delivers the impulse response received on the reference antenna to the transmitter EMET1 of the originating communicating entity.
• the transfer function of the impulse pulse (t) having passed through the first propagation channel C1 (ref ⁇ -j) between the destination antenna A2, and the reference antenna Al re r is denoted by Hl re ( ⁇ j ( f).
• Steps E3 to E8 are then reiterated for at least part of the set of original antennas.
• the iterations are symbolized by the initialization step INIT and a step IT2 of incrementation of the index i of the antennas of origin Al 1 .
• An iteration of the steps E3 to E8 is thus described for an antenna of origin Al 1 , i between 1 and M1.
• the transmitter EMET1 transposes the pulse delivered by the selective receiver of the frequency f2 onto a carrier frequency f1 of the frequency band dedicated to the transmissions of the communicating entity EC1 to the communicating entity EC2. .
• the received pulse is shifted to the carrier frequency fl is then emitted via the antenna A1 to the destination communicating entity.
• step E4 the REC2 receiver of the destination communicating entity receives an impulse response, called the combined impulse response ri comb (t), on all the destination antennas.
• the receiver REC2 selects the combined impulse response received on the antenna A2 j corresponding to a round trip of the pulse transmitted during the step E1.
• the transfer function is ri comb (t) representative of the successive crossing of the first and second propagation channels is given by
• the receiver REC2 delivers the combined impulse response to the RTEMP2 pulse analyzer of the destination communicating entity.
• step E5 the RTEMP2 pulse analyzer performs the time reversal of the combined impulse response.
• the pulse analyzer records the combined impulse response, for example memorizes the coefficients of the combined impulse response and classifies the conjugates of the latter in an inverse order to that of the coefficients of ri comb (t).
• the transfer function of the combined impulse response returned temporally ri comb (-t) is thus given by
• the pulse analyzer analyzes the impulse response ri comb (t) with an analog divider and derives a discrete model from the combined impulse response. The analyzer then performs the time reversal from the discrete model. The pulse analyzer then delivers the impulse response ri comb (-t) to the transmitter EMET2 of the destination communicating entity.
• step E6 the transmitter EMET2 transmits via the antenna A2 j to the source communicating entity, the combined impulse response returned temporally after transposition on the carrier frequency f2.
• step E7 the originating communicating entity receives the combined time-returned combined impulse response transmitted by the destination communicating entity on all of the original antennas.
• the REC1 receiver of the source communicating entity selects the combined time-returned combined impulse response received by the reference antenna A1 ref .
• the receiver REC1 then delivers the coefficients of the transfer function H ,, (f), or the corresponding impulse response ri, j (t), to the memory MEM1 of the source communicating entity.
• the memory MEM1 of the originating communicating entity comprises a set of functions transfer or memorized impulse responses.
• the memory MEMl includes the transfer functions H ⁇ (f) for i varying from 1 to Ml and j varying from there to M2.
• the PEGA1 pre-equalizer of the source communicating entity determines pre-equalization coefficients of a data signal S (t) having M1 antenna signals [S
• the antenna signal Si (t) transmitted via the antenna Al 1 is thus shaped by applying the corresponding filter F1, (f) given by:
• the weighting coefficients C j , j between 1 and M2 are configurable parameters. They are determined according to the method of generating a used data signal. These parameters are further updated for example when extinguishing or activating a destination antenna or depending on the evolution of the state of the propagation channels over time.
• the data signal is thus pre-equalized by filtering each of the antenna signals by the corresponding filter of the set FI and transmitted by the communicating entity EC1 to the communicating entity EC2. .
• the steps E3 to E8 are performed for a single antenna of origin Al, all of the original antennas.
• This embodiment corresponds to the case where the data signal to be equalized is the antenna signal
• the memory MEM1 of the source communicating entity has M2 transfer functions H 11 (I) for j varying from 1 to M2.
• the pre-equalizer Pegal FI determines a single pre-equalization filter, (f) the antenna signal S, (t), transmitted via the antenna A1 is thus formed by applying the corresponding filter FI 1 (I ) given by:
• the set of destination antennas has only one destination antenna A2 [.
• the succession of steps E1 to E8 is implemented only for the transmission of a single pulse by the antenna A2 [of the destination communicating entity. Steps E3 to E8 are reiterated for at least a portion of the antennas of the originating communicating entity.
• the pre-equalizer determines pre-equalization coefficients as a function of M1 transfer functions H, ⁇ (f), i varying from 1 to Ml.
• the set FI of MI pre-equalization filters FI, (f) to be applied to the data signal is given by
• FI [FI 1 , ..., FI 1 (I), .... FI M 1 (f)] with
• the set of original antennas comprises only one antenna of origin Al 1.
• the data signal then comprises only one signal of antenna Si (t) transmitted by the single antenna Al i and the reference antenna is the original antenna Al i
• Steps E3 to E8 are then performed only for this single antenna Al i of the communicating entity of
• M2 transfer functions H 1J , j varying from 1 to M2 are available.
• equalizer determines a single pre-equalization filter FI 1 (I) applied to the data signal from M2 coefficients C j such that.
• the set of original antennas has only one original antenna Al 1 and the set of destination antennas has only one destination antenna A2i.
• the data signal then comprises only an antenna signal S i (t) transmitted by the single antenna Al 1 and the reference antenna of the origin entity is the antenna Al
• the transfer function H 11 determines a single pre-equalization filter FI 1 (I) given by
• the originating communicating entity comprising Ml originating antennas and the destination communicating entity comprising M2 destination antennas, step E9 for determining the pre-equalization coefficients of the data signal comprising Ml signals.
• antenna is implemented after iterating steps E1 to E8 without intermediate iteration of steps E3 to E8. An iteration of the steps
• E1 to E9 is then performed for all origination and destination antenna pairs (A1 1 , A2
• the iteration loops are performed on part of the destination antennas and part of the original antennas.
• the number of antennas and the choice of antennas are configurable parameters of the process. They are determined for example according to characteristics of the antennas.
• the method can also be implemented for bidirectional transmission.
• the method is implemented in the upstream and the downstream direction so that the emission of a pulse by an antenna and an antenna signal by a communicating entity are not performed simultaneously to ensure the processing of impulse responses representative of the crossing of one or more propagation channels.
• the invention described herein relates to a device for the pre-equalization of a data signal implemented in a communicating entity of origin. Accordingly, the invention also applies to a computer program, in particular a computer program on or in an information recording medium, adapted to implement the invention.
• This program can use any programming language, and be in the form of source code, object code, or intermediate code between source code and object code such as in a partially compiled form, or in any other form desirable to implement those steps of the method according to the invention implemented in the communicating entity of origin.
• the invention described here also relates to a device for the pre-equalization of a data signal implemented in a destination communicating entity. Accordingly, the invention also applies to a computer program, in particular a computer program on or in an information recording medium, adapted to implement the invention.
• This program can use any programming language, and be in the form of source code, object code, or intermediate code between source code and object code such as in a partially compiled form, or in any other form desirable to implement those steps of the method according to the invention implemented in the recipient communicating entity.

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• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Power Engineering (AREA)
• Radio Transmission System (AREA)
• Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2007
  • 2007-12-21 FR FR0760228A patent/FR2925798A1/fr active Pending
• 2008
  • 2008-12-19 EP EP08870341A patent/EP2232802A1/de not_active Withdrawn
  • 2008-12-19 CN CN2008801221339A patent/CN101904143A/zh active Pending
  • 2008-12-19 WO PCT/FR2008/052377 patent/WO2009087328A1/fr active Application Filing
  • 2008-12-19 US US12/745,034 patent/US20100302977A1/en not_active Abandoned
  • 2008-12-19 JP JP2010538875A patent/JP2011507442A/ja active Pending

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