WO2014067980A1 - Procede et dispositif de demodulation de signaux modules gfsk sur q etats - Google Patents
Procede et dispositif de demodulation de signaux modules gfsk sur q etats Download PDFInfo
- Publication number
- WO2014067980A1 WO2014067980A1 PCT/EP2013/072675 EP2013072675W WO2014067980A1 WO 2014067980 A1 WO2014067980 A1 WO 2014067980A1 EP 2013072675 W EP2013072675 W EP 2013072675W WO 2014067980 A1 WO2014067980 A1 WO 2014067980A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phase
- symbols
- shift keying
- message
- frequency shift
- Prior art date
Links
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
- H04L25/03178—Arrangements involving sequence estimation techniques
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
- H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
- H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
- H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator
- H03D3/10—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator in which the diodes are simultaneously conducting during the same half period of the signal, e.g. radio detector
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
Definitions
- the present invention relates to the field of signal transmission, more specifically to the reception of a signal modulated on Q states by frequency shift with Gaussian filtering. It relates more specifically to a method for demodulating and decoding at least one such received signal.
- a logical 0 is represented by a signal at the frequency f 0 and a logical 1 by a frequency in the Four-Frequency Shift-Keying Frequency Shift-Keying (QFSK) Four Frequency Shift-Keying Frequency-Shift-Keying Four Frequency Shift-Keying Frequency Shift Keying
- Gaussian filtering reduces the bandwidth of the signal to modulate, and also the bandwidth of the modulated signal.
- GFSK has better spectral efficiency than normal frequency shift keying.
- the GFSK modulation is thus implemented within the framework of standard such as the Bluetooth or DECT standard (for the English Digital Enhanced Cordless Telephone meaning Digital Enhanced Digital Telephone).
- the Gaussian filter modulator, as well as the multi-path effect present in the communication channel through which the signal passes, introduces inter-symbol interference, so that the demodulation of the signal takes on a non-linear appearance making it complex. to achieve.
- the authors start from a model of linear transmission of the GFSK signal, notably with the modeling of a transfer function h modeling the influence of the transmission channel.
- the received GFSK signal is
- phaser has _i k is replaced by its estimate â k _i, which is estimated using a Viterbi trellis and based on the decisions taken at each stage Viterbi.
- a metric for a transition is based on the difference between the received signal and a reconstructed signal from previously estimated states.
- An object of the invention is to enable a demodulation of Q-modulated signals by Gaussian-filtered frequency shift, for example GSFK or QGFSK modulations, with a minimum of hardware requirements for the implementation of the demodulation, while maintaining a good quality of demodulation and decoding.
- the demodulator is assisted by an equalizer in order to better discriminate the symbols received, altered by inter-symbol interference.
- the invention proposes, according to a first aspect, a method for demodulating and decoding at least one received signal modulated on Q states by frequency shift with Gaussian filtering, said signal being received from a communication channel and comprising a message consisting of message symbols, said method being characterized in that for determining a message symbol,
- a plurality of possible phase increments are estimated by the application of a linear filter to a plurality of sequences of M phase modulation products by phase shift of possible consecutive message symbols,
- the message symbol is determined by selection of possible consecutive symbols whose estimated phase is closest to the received signal.
- the phase shift keying when the frequency shift keying is a two-state gaussian filtering frequency shift keying, the phase shift keying is a BPSK binary phase shift keying, or when the frequency shift keying is a four-state gaussian filtering frequency shift keying, the phase shift keying is QPSK quaternary phase shift keying;
- the selection of the possible consecutive symbols whose estimated phase is closest to the received signal is implemented by means of a Viterbi algorithm whose trellis is determined by the linear filter;
- a new cumulative phase is determined by adding to the cumulative phase of the previous iterations of the phase increment method corresponding to the phase shift keying (B) of the message symbol thus determined, said new cumulated phase being the cumulative phase for the subsequent iteration of the process;
- the linear filter is obtained by minimization in the least squares sense of a square error criterion expressing the difference between phase shift keying products of a known sequence of message symbols and a part of the received signal corresponding to said known sequence of message symbols;
- the linear filter is an estimate of an impulse response of the communication channel modeled by M coefficients
- the modeling of the impulse response of the communication channel takes into account the passage of the modulation of the symbols from a phase shift keying (PSK) to a frequency shift keying (FSK) modulation; the impulse response of the communication channel is estimated from a known sequence of symbols present in the received signal, said method comprising the following steps:
- the matrix P corresponds to the Penrose pseudo-inverse of a Hankel M matrix of dimension (L-M) * M constituted by the components of the reference signal R, where L is the number of symbols of the known sequence.
- the invention according to a second aspect also relates to a demodulator-equalizer for demodulating and decoding at least one received signal modulated on Q states by frequency shift with Gaussian filtering, comprising at least one memory and a processor, said processor being configured to implement the process according to the first aspect.
- the second aspect of the invention also relates to a receiver for receiving a frequency shift modulated signal using a Q state Gaussian GFSK filter, comprising at least one demodulator-equalizer according to the second aspect.
- the invention according to a third aspect also relates to a computer program product comprising program code instructions for executing the steps of the method according to the first aspect, when said program is executed by a computing system comprising at least one processor.
- this computer program product takes the form of a computer-readable information medium.
- FIG. 1 is a diagram illustrating a receiver equipped with a demodulator-equalizer according to the invention for implementing the method according to the invention
- FIG. 2 is a block diagram illustrating the sequence of different steps of a possible embodiment of the method according to the invention
- FIG. 3 is a block diagram illustrating various steps of a possible mode of determining the modeling of the communication channel according to one possible embodiment of the method according to the invention
- FIG. 4 is a diagram partially illustrating the construction of a trellis for two nodes thereof;
- FIG. 5 is a graph whose various curves illustrate simulation results of implementations of possible embodiments of the method according to the invention.
- FIG. 6 is a graph illustrating the phase noise used for certain implementations of possible embodiments of the method according to the invention, the results of which are illustrated in FIG. 5.
- the signal is received via a radiofrequency part 2 comprising at least one antenna 3 associated with radio frequency reception and processing means for receiving the signal, a sample-and-hold device 4 and an analog-digital converter 5 for processing the signal received.
- the received signal is then processed by a processing stage 6 to be digitally filtered, and then processed in particular by detecting the rising edges in order to achieve an automatic gain control controlling in particular the radiofrequency part.
- the receiver acquires and maintains the synchronization, and proceeds by means of a processor 8 of a demodulator-equalizer 7 to the demodulation of the signal, then the deinterleaving and decoding of the channel, followed by a binary descrambling , to finally restore the binary source at the origin of the signal.
- the role of the demodulator-equalizer 7 is to convert the received QGFSK-modulated signal into a binary sequence which will subsequently be transmitted to the channel decoder. It comprises at least one processor 8, preferably a processor of digital signal processing, or DSP for the English Digital Signal Processor, and preferably a memory 9.
- the demodulation method according to the invention aims at iteratively reconstructing a signal modulated on Q states by frequency shift with Gaussian filtering (GFSK) from a modulated reference signal. on Q states by frequency shift filtered using a linear filter.
- GFSK Gaussian filtering
- the invention takes advantage of a novel property discovered by the applicant, according to which the k th symbol of a gaussian filtering frequency-shift modulated message corresponds to a sum of phase shift modulation products of the same message, the modulating products being weighted by the coefficients of a linear filter that models the communication channel by incorporating the transition from phase shift keying to frequency shift keying.
- the invention implements an iterative reconstruction of the gaussian filtered frequency shift keyed signals received from phase shifted reference signals.
- a plurality of possible phase increments are estimated by the application of a linear filter to a plurality of sequences of M phase modulation products by phase shift of possible consecutive message symbols,
- the message symbol is determined by selection of possible consecutive symbols whose estimated phase is closest to the received signal.
- the phase shift keying is a BPSK binary phase shift keying.
- the phase shift keying is QPSK quaternary phase shift keying.
- 2 ⁇ M ⁇ 4 is chosen.
- the selection of possible consecutive symbols is implemented by means of a maximum likelihood criterion, for example by means of the Viterbi algorithm whose mesh is determined by the linear filter.
- a maximum likelihood criterion for example by means of the Viterbi algorithm whose mesh is determined by the linear filter.
- the method comprises a first step S01 for reading a received symbol z (k) forming part of a signal received from a communication channel.
- a demodulator-equalizer MLSE for the English Maximum Likelihood sequence estimation estimates the symbol sequence transmitted in the sense of the maximum likelihood: the equalizer compares the received symbol sequences to the pre-calculated theoretical sequences. If Q denotes the number of states of the modulation scheme used and N the number of symbols received, then it is theoretically necessary to calculate the Euclidean distances between the received sequence and the Q N sequences that can be formed and choose from among them the sequence giving the smallest distance.
- the method according to the invention has the particularity, compared to the conventional Viterbi algorithm, of iteratively constructing a reference signal of good quality, parallel to the elaboration of the trellis, the estimated binary sequence is progressively available (it will not be complete only when the process of updating cumulative path metrics and selecting surviving branches will be completed).
- step S02 the branches metrics are calculated (step S02) for the Q M states of the lattice that can be obtained, by means of the coefficients of the linear filter modeling the impulse response. the communication channel.
- the cumulative phase at the moment kM resulting from the successive decisions taken on the previously received symbols is known, it is noted C k -M-
- the demodulator is able to calculate for each of the Q M M-tuples that it is theoretically possible to form, the corresponding phase values.
- a metric is then associated with each M-tuplet, by calculating the Euclidean distance between the phase value associated with it and the received signal.
- FIG. 4 illustrates an example of a trellis construction for three instants, from k-2 to k, in which are only reproduced possible paths starting and ending sequences 000 and 010 at time k-1.
- the cumulative phase C k -3 is known. The corresponding phase increment ⁇ .
- phase value z corresponding to this triplet (X 1, X 2 , X 3 ) of the trellis, corresponding to a node of the trellis.
- Euclidean distance between this phase value z associated with it and the received signal z is calculated according to:
- step S03 the accumulated path metrics are updated and compared with each other.
- the surviving branches are then selected (step S04).
- An arrival node is constituted by a sequence of M consecutive possible symbols.
- the Viterbi algorithm requires to keep only one and one. The most likely branch under the maximum likelihood criterion is retained (that is, the sum of the branch and path metrics from the originating node is the smallest). This gives us, for each arrival node, a new path metric that is recorded for the next iteration.
- step S05 the corresponding phase increment AO k . M + i is selected (step S05) to construct the reference signal C k . M + i of the next iteration (step S06) by adding said phase increment ⁇ . ⁇ + ⁇ to the cumulative phase constituting the reference signal C k -M previously used.
- step S07 K and can then perform the recovery of the surviving nodes, according to the so-called method of back linkage ("trace back") (step S07).
- trace back the so-called method of back linkage
- the estimated bit sequence is progressively available (it will only be complete when the process of updating cumulative path metrics and selection of surviving branches is completed) so that it is not necessary to execute the subsequent process of raising the surviving nodes.
- each packet ends with M known symbols. This allows us to know with absolute certainty the final node which leads all the surviving paths and thus to select the final branch leading the most likely during the iteration K-M + 1. Therefore, it may be advantageous to carry out the complete trace back of the trellis because of the performance gain provided by the presence of the known symbols at the end of the packet.
- the linear filter is a modeling, or estimation, of an impulse response of the communication channel through which the signal is received. This communication channel is modeled by M coefficients and takes into account the passage of symbol modulation from phase shift keying to frequency shift keying.
- the linear filter is obtained by least squares minimization of a squared error criterion expressing the difference between a known sequence of phase shifted symbols and a portion of the received signal corresponding to said known sequence of shifted symbols. phase.
- the impulse response of the communication channel is estimated from a known sequence of symbols present in the received signal, said known sequence being a preamble, also called synchronization field.
- the estimation of the impulse response begins (step S20) by extracting the symbols of the preamble corresponding to the known sequence of symbols contained in the received signal.
- the symbols are known to the receiver 1, which has a local copy, for example in its memory 9, or a means of generating said known sequence of symbols, such as an algorithm for generating said sequence.
- This sequence of known symbols makes it possible to construct (step S21) a reference signal R whose comparison with the received preamble makes it possible to estimate the impulse response of the communication channel.
- This reference signal R is constructed by the product of the phase shift modulations of the symbols of the known sequence.
- X 1 BPSK ⁇ BPSK ⁇ X Q
- X k is estimated as being:
- X k is estimated as: fc-l
- the matrix P corresponds to the Penrose pseudo-inverse of a Hankel M matrix of dimension (LM) * M made up of the components of the reference signal R.
- LM Hankel M matrix of dimension
- step S22 a matrix Hankel M is constructed (step S22), consisting of the modulated symbols X 0 to X L -i of the reference signal R.
- This Hankel matrix M is a non-square matrix whose values are constant along the ascending diagonals.
- This matrix M has dimension (L-M) * M.
- the first column of this matrix M corresponds to the first LM components of the reference signal, so that the matrix M is in the form:
- a matrix P is calculated (step S23) which is the penrose pseudoinverse of said matrix of Hankel M.
- the matrix P can thus be reconstructed by intermediate calculations involving a Hankel matrix and its pseudo-inverse Penrose, or be directly constructed from the modulated symbols X 0 to X L -i of the reference signal R according to an organization previously established to correspond to Penrose pseudoinverse of Hankel M's matrix.
- a vector V is then formed whose components correspond to the symbols of the preamble previously extracted (step S24).
- the coefficients of the linear filter modeling the communication channel are preferably updated for each packet, by means of the known sequence of symbols used as synchronization field at the beginning of each packet.
- MIN means the use of a minimum search algorithm
- CORDIC is the abbreviation of the English COordinate Rotation Digital Computer meaning numerical calculation by coordinate rotation, and corresponds to a trigonometric function calculation algorithm.
- the curves of FIG. 5 illustrate simulation results implementing the invention. They represent the bit error rate (BER) as a function of the signal to noise ratio Es / NO in decibels.
- the method offers good performance, although the QGFSK modulation form is sensitive to phase noise.
- the channel is modeled by the addition of Gaussian white noise and phase noise if necessary,
- phase noise is obtained by means of filtered white noise in the frequency domain using the phase noise profile to be tested represented in FIG. 6 by the curve 45 illustrating the power spectral density (in dB / Hz) according to the frequency Hz,
- the demodulator has been implemented in floating point
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201380057370.2A CN104904171B (zh) | 2012-10-30 | 2013-10-30 | 用于解调q态gfsk调制信号的方法和装置 |
RU2015120649A RU2638774C2 (ru) | 2012-10-30 | 2013-10-30 | Способ и устройство демодуляции сигналов, gfsk-модулированных по q состояниям |
CA2889926A CA2889926C (fr) | 2012-10-30 | 2013-10-30 | Procede et dispositif de demodulation de signaux modules gfsk sur q etats |
AU2013340886A AU2013340886B2 (en) | 2012-10-30 | 2013-10-30 | Method and device for demodulating GFSK-modulated signals with Q states |
BR112015009729A BR112015009729A2 (pt) | 2012-10-30 | 2013-10-30 | método e dispositivo para demodulação de sinais modulados por gfsk nos estados q |
EP13785440.2A EP2915302B9 (fr) | 2012-10-30 | 2013-10-30 | Procede et dispositif de demodulation de signaux modules gfsk sur q etats |
IN3918DEN2015 IN2015DN03918A (fr) | 2012-10-30 | 2013-10-30 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1260374 | 2012-10-30 | ||
FR1260374A FR2997594B1 (fr) | 2012-10-30 | 2012-10-30 | Procede de demodulation de signaux modules gfsk sur q etats |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014067980A1 true WO2014067980A1 (fr) | 2014-05-08 |
Family
ID=48468377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2013/072675 WO2014067980A1 (fr) | 2012-10-30 | 2013-10-30 | Procede et dispositif de demodulation de signaux modules gfsk sur q etats |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP2915302B9 (fr) |
CN (1) | CN104904171B (fr) |
AU (1) | AU2013340886B2 (fr) |
BR (1) | BR112015009729A2 (fr) |
CA (1) | CA2889926C (fr) |
FR (1) | FR2997594B1 (fr) |
IN (1) | IN2015DN03918A (fr) |
RU (1) | RU2638774C2 (fr) |
WO (1) | WO2014067980A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107995137A (zh) * | 2017-11-23 | 2018-05-04 | 安凯(广州)微电子技术有限公司 | Gfsk调制方法、装置及终端设备 |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10050813B2 (en) * | 2016-10-25 | 2018-08-14 | Samsung Electronics Co., Ltd | Low complexity sequence estimator for general packet radio service (GPRS) system |
CN109729030B (zh) * | 2017-10-27 | 2021-09-03 | 博通集成电路(上海)股份有限公司 | 用于发送分组的发射机及其发送分组的方法 |
CN110858826A (zh) | 2018-08-22 | 2020-03-03 | 畅想科技有限公司 | Gfsk检测器 |
CN111082811B (zh) * | 2019-12-28 | 2023-05-02 | 复旦大学 | 一种s=8编码方式的低功耗蓝牙维特比联合解调解码方法 |
CN111277527B (zh) * | 2020-01-15 | 2021-10-29 | 西安电子科技大学 | N阶维特比思想应用在m-gfsk相位域的解调方法 |
CN113973038A (zh) * | 2020-07-24 | 2022-01-25 | 晶晨半导体(上海)股份有限公司 | 编码信号解调方法、装置、设备以及计算机可读存储介质 |
CN114765527B (zh) * | 2021-01-14 | 2023-09-19 | 华东师范大学 | 一种gfsk信号维特比解调的联合同步方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6240142B1 (en) * | 1998-01-07 | 2001-05-29 | Qualcomm Incorporated | Quadrature modulator and demodulator |
DE10030390C2 (de) * | 2000-06-21 | 2003-08-07 | Infineon Technologies Ag | Demodulationsverfahren und Demodulator für CPFSK-modulierte Signale |
WO2002084967A2 (fr) * | 2001-04-16 | 2002-10-24 | Thomson Licensing S.A. | Systeme de poursuite de phase |
RU2393641C1 (ru) * | 2008-12-23 | 2010-06-27 | Открытое Акционерное Общество "Конструкторское Бюро "Луч" | Демодулятор фазоманипулированных сигналов |
-
2012
- 2012-10-30 FR FR1260374A patent/FR2997594B1/fr active Active
-
2013
- 2013-10-30 WO PCT/EP2013/072675 patent/WO2014067980A1/fr active Application Filing
- 2013-10-30 EP EP13785440.2A patent/EP2915302B9/fr active Active
- 2013-10-30 IN IN3918DEN2015 patent/IN2015DN03918A/en unknown
- 2013-10-30 AU AU2013340886A patent/AU2013340886B2/en active Active
- 2013-10-30 CA CA2889926A patent/CA2889926C/fr active Active
- 2013-10-30 CN CN201380057370.2A patent/CN104904171B/zh active Active
- 2013-10-30 RU RU2015120649A patent/RU2638774C2/ru active
- 2013-10-30 BR BR112015009729A patent/BR112015009729A2/pt not_active Application Discontinuation
Non-Patent Citations (3)
Title |
---|
BENKESER C ET AL: "A 1mm2 1.3mW GSM/EDGE digital baseband receiver ASIC in 0.13 Â[mu]m CMOS", VLSI SYSTEM ON CHIP CONFERENCE (VLSI-SOC), 2010 18TH IEEE/IFIP, IEEE, PISCATAWAY, NJ, USA, 27 September 2010 (2010-09-27), pages 183 - 188, XP031806400, ISBN: 978-1-4244-6469-2 * |
READY M J ET AL: "DEMODULATION OF COCHANNEL FSK SIGNALS USING JOINT MAXIMUM LIKELIHOOD SEQUENCE ESTIMATION", PROCEEDINGS OF THE ASILOMAR CONFERENCE. PACIFIC GROVE, NOV. 1 - 3, 1993; [PROCEEDINGS OF THE ASILOMAR CONFERENCE], NEW YORK, IEEE, US, vol. 2 OF 02, 1 November 1993 (1993-11-01), pages 1412 - 1415, XP000438539 * |
SPETH M ET AL: "MLSE based detection for GFSK signals with arbitrary modulation index", COMMUNICATIONS, 2004 INTERNATIONAL ZURICH SEMINAR ON ZURICH, SWITZERLAND FEB.18-20, 2004, PISCATAWAY, NJ, USA,IEEE, 18 February 2004 (2004-02-18), pages 228 - 231, XP010697711, ISBN: 978-0-7803-8329-6, DOI: 10.1109/IZS.2004.1287431 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107995137A (zh) * | 2017-11-23 | 2018-05-04 | 安凯(广州)微电子技术有限公司 | Gfsk调制方法、装置及终端设备 |
Also Published As
Publication number | Publication date |
---|---|
IN2015DN03918A (fr) | 2015-10-02 |
BR112015009729A2 (pt) | 2017-07-04 |
EP2915302A1 (fr) | 2015-09-09 |
RU2638774C2 (ru) | 2017-12-15 |
EP2915302B1 (fr) | 2016-09-14 |
AU2013340886A1 (en) | 2015-06-04 |
AU2013340886B2 (en) | 2016-05-26 |
EP2915302B9 (fr) | 2017-11-15 |
FR2997594B1 (fr) | 2015-11-20 |
CA2889926A1 (fr) | 2014-05-08 |
RU2015120649A (ru) | 2016-12-20 |
FR2997594A1 (fr) | 2014-05-02 |
CN104904171B (zh) | 2017-09-22 |
CA2889926C (fr) | 2016-08-02 |
CN104904171A (zh) | 2015-09-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CA2889926C (fr) | Procede et dispositif de demodulation de signaux modules gfsk sur q etats | |
EP2947799B1 (fr) | Procédé de turbo-égalisation linéaire au sens large dans un contexte multi-utilisateurs et pour un récepteur multi-voies | |
FR2802371A1 (fr) | Procede de signalisation dans un systeme de radiocommunication, emetteurs, recepteurs et repeteurs pour la mise en oeuvre du procede | |
EP1282968A1 (fr) | Procede et systeme de detection et de decodage iteratif de symboles recus, couple a une reestimation des coefficients du canal de transmission | |
WO2007057558A1 (fr) | Procede et dispositif de demodulation souple dans un systeme ofdm-cdma | |
EP1168739A1 (fr) | Procédé et dispositif d'estimation de la réponse impulsionelle d'un canal de transmission d'informations, en particulier pour un téléphone mobile cellulaire | |
EP3373489B1 (fr) | Système d'émission/réception utilisant une modulation conjointe orthogonale-linéaire | |
WO2012093115A1 (fr) | Procédé de décodage et décodeur | |
EP0352159B1 (fr) | Procédé et dispositif de démodulation de signaux à enveloppe constante et phase continue modulés angulairement par un train de symboles binaires, tolérant les dérives de fréquence | |
FR2825551A1 (fr) | Procede d'estimation de la fonction de transfert d'un canal de transmission d'un signal multiporteuse, procede de reception d'un signal numerique, et recepteur d'un signal multiporteuse correspondants | |
EP3800813B1 (fr) | Procédé et un dispositif de prédiction des performances d'un récepteur dans un système de communication | |
EP0147414A1 (fr) | Procede de demodulation non-coherente d'un signal module lineairement a energie par symbole constante et demodulateur pour la mise en oeuvre dudit procede. | |
EP2728821B1 (fr) | Méthode et dispositif d'égalisation pour canal de transmission non-linéaire | |
WO2006117268A1 (fr) | Procédé de décodage itératif d'un signal ofdm/oqam utilisant des symboles à valeurs complexes, dispositif et programme d'ordinateur correspondants | |
CA2125444A1 (fr) | Systeme de transmission numerique a etalement de spectre obtenu par codage pseudo-aleatoire basse frequence de l'information utile et procede d'etalement et de compression de spectre utilise dans un tel systeme | |
EP3912317B1 (fr) | Procédé de réception d'un signal soqpsk-tg en décomposition pam | |
EP1213884B1 (fr) | Procédé et dispositif d'estimation des valeurs successives de symboles numériques, en particulier pour l'égalisation d'un canal de transmission d'informations en téléphonie mobile | |
WO2010057871A2 (fr) | Procede de modulation multi-etats a phase continue et emetteur mettant en oeuvre le procede | |
FR3006132B1 (fr) | Procede de demodulation et demodulateur d'un signal module a phase continue, et programme d'ordinateur correspondant | |
FR2805690A1 (fr) | Procede d'estimation d'un ecart de frequence radio, et recepteur de radiocommunication mettant en oeuvre le procede | |
WO2023110971A1 (fr) | Procede de reception de signaux radiofrequences non etales spectralement | |
FR2767983A1 (fr) | Procede de decodage et de synchronisation de phase simultanes exploitant le critere de maximum de vraisemblance et dispositif correspondant | |
FR2855000A1 (fr) | Procede de reception d'un signal multiporteuse mettant en oeuvre une determination du format du filtrage de mise en forme et recepteur correspondant | |
WO2005096577A1 (fr) | Procede de reception d’un signal mettant en oeuvre un critere de type maximum de vraisemblance, dispositif de reception et radiotelephone correspondants | |
FR2925809A1 (fr) | Procede de transmission d'un signal complexe, module a l'aide d'une modulation angulaire, par exemple de type gmsk, et dispositif correspondant |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13785440 Country of ref document: EP Kind code of ref document: A1 |
|
DPE1 | Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101) | ||
ENP | Entry into the national phase |
Ref document number: 2889926 Country of ref document: CA |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112015009729 Country of ref document: BR |
|
REEP | Request for entry into the european phase |
Ref document number: 2013785440 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013785440 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2015120649 Country of ref document: RU Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2013340886 Country of ref document: AU Date of ref document: 20131030 Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 112015009729 Country of ref document: BR Kind code of ref document: A2 Effective date: 20150429 |