Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Other

France Telecom

Telediffusion De France

Centre National D'etudes Des Telecommunications

France Telecom, Telediffusion De France S.a.

France Telecom, Telediffusion De France

Mitsubishi Electric Information Technology Centre Europe B.v.

Mitsubishi Electric R&d Centre Europe B.v.

Damien Castelain

David Mottier

Loic Brunel

Cristina Ciochina

Nicolas Gresset

Herve Bonneville

Nicolas Voyer

Mourad Khanfouci

Jean-Francois Helard

Pierre Combelles

Daniel Pommier

Nadine Chapalain

Arnaud Gueguen

Michel Alard

Sophie Pautonnier-Perrot

Alain Mourad

Bernard Le Floch

Denis Callonnec

Loïc Brunel

Vincent Corlay

Joel Richard

Roselyne Halbert-Lasselle

Jean-Christophe Rault

Yuji Matsuki

Hervé Bonneville

Yoshitaka Hara

Noriyuki Fukui

M Noriyuki Fukui

The present invention concerns a method and device for transferring, by an emitter, a flow of samples to a receiver through a wireless interface using Single-Carrier Frequency Division Multiple Access. The emitter: &#x2014;selects consecutive blocks of M samples of the flow of samples, &#x2014;modulates each selected block, &#x2014;selects, for each modulated block, half of the modulated block located in the center of the modulated block, &#x2014;selects, with a M/2 sample shift, consecutive blocks of M samples, &#x2014;modulates each selected block with the shift, &#x2014;selects, for each modulated block with the shift, half of the modulated block with the shift located in the center of the modulated block with the shift, &#x2014;forms a stream composed of one in two half ordered modulated blocks and, between two half ordered modulated blocks, one half ordered modulated block with the shift, &#x2014;transfers the formed stream.

Method, device and storage medium for transferring, by emitter, flow of samples to receiver by emitter

Method and device for performing channel estimation

The present invention concerns a method and device for demodulating received symbols using a turbo-demodulation scheme comprising an iterative channel equalization and wherein an iterative channel decoder is used in the turbo-demodulation scheme, characterized in that the iterative channel decoder performs a first iterative process named iterative decoding process, the turbo-demodulation performing a second iterative process named iterative demodulation and decoding process, at each iteration of the second iterative process, the iterative channel decoder executing plural iterations in order to decode bits from which symbols are derived from. The iterative channel decoder: &#x2014;memorizes at the end of the iterations of the first iterative process, the variables used internally by the iterative channel decoder, &#x2014;reads the memorized variables at the following iteration of the second iterative process.

Method and device for iterative demodulation, equalization and channel decoding

The present invention concerns a method and device for demodulating received symbols using a turbo-demodulation scheme comprising an iterative MIMO decoder and wherein an iterative channel decoder is used in the turbo-demodulation scheme, wherein the iterative channel decoder performs a first iterative process named iterative decoding process, the turbo-demodulation performing a second iterative process named iterative demodulation and decoding process, at each iteration of the second iterative process, the iterative channel decoder executing plural iterations in order to decode bits from which symbols are derived from. The iterative channel decoder:

Method and device and computer program for demodulating received symbols using turbo-demodulation scheme

The present invention concerns a method and device for demodulating received symbols using a turbo-demodulation scheme comprising an iterative de-mapping and wherein an iterative channel decoder is used in the turbo-demodulation scheme, characterized in that the iterative channel decoder performs a first iterative process named iterative decoding process, the turbo-demodulation performing a second iterative process named iterative demodulation and decoding process, at each iteration of the second iterative process, the iterative channel decoder executing plural iterations in order to decode bits from which symbols are derived from, and wherein the iterative channel decoder: memorizes at the end of the iterations of the first iterative process, the variables used internally by the iterative channel decoder, reads the memorized variables at the following iteration of the second iterative process.

Method and device for turbo demodulation, iterative demapping and iterative decoding

The present invention concerns a method for correcting a frequency shift on symbols received by a receiver, each symbol being composed of N samples and of a cyclic prefix of a predetermined number &#x394; samples, the &#x394; samples being a copy of &#x394; samples of the N samples. The receiver: &#x2014;calculates for each symbol, a correlation between at most the &#x394; samples of the cyclic prefix and the at most &#x394; samples among the last samples, &#x2014;averages the correlations over a number of symbols and determines one smooth frequency shift estimation for each averaged correlation, &#x2014;calculates an exponential from the smooth frequency shift estimation, delays the received symbols by a delay, &#x2014;multiplies the exponential by the delayed received symbols.

Method, device and computer program for correcting a frequency shift on symbols received by a receiver

The present invention concerns a method for cancelling a narrow band interference in a single carrier signal. The method comprises the steps executed by a receiver of: receiving the single carrier signal and transforming the single carrier signal into received symbols, transforming the received symbols from the time domain to the frequency domain into received symbols in the frequency domain, determining a signal and thermal noise power estimation based on the received symbol powers in the frequency domain, estimating variances of the narrow hand interference from the signal and thermal noise power estimation and the received symbol powers in the frequency domain, equalizing the received symbols in the frequency domain or symbols derived from the received symbols in the frequency domain taking into account the estimate of the variances of the narrow band interference.

Method and device for cancelling a narrow band interference in a single carrier signal and computer program

A method for decoding differentially modulated received symbols, the differentially modulated received symbols corresponding to a transmission of a differentially modulated version of a codeword out of a set of possible codewords, the received symbols being transferred onto resources of a channel, the resources being equally spaced. A receiver, for each possible codeword: obtains a vector of differentially demodulated symbols by differentially demodulating the differentially modulated received symbols obtained by combining two consecutive differentially modulated received symbols; calculates the product of each differentially demodulated symbol by the conjugate of the element of the codeword having the same rank within the codeword as the differentially demodulated received symbol; calculates the sum of the products; decodes the vector of differentially demodulated symbols by selecting the codeword for which the sum of the products is the maximum.

Method and a device for decoding differentially modulated symbols

A method and device for transferring OFDM symbols representative of at least a first and a second stream from a source including a first number of antenna to at least one receiver. The source demultiplexes the first stream to extract at least one first pilot sequence and first data and the second stream to extract at least one second pilot sequence and second data, multiplies the at least one first pilot sequence and first data by a first coefficient, the at least one second pilot sequence and second data by a second coefficient different from the first coefficient, sums first multiplied data and second multiplied data, multiplexes the sum, the at least one first and second multiplied pilot sequences to form the OFDM symbols, and transfers the OFDM symbols.

Method and a device for transferring OFDM symbols representative of plural streams

In a wireless communication system a frame composed of plural single carrier orthogonal frequency division multiplex symbols is transferred between a source and a receiver. The frame includes at least one hybrid symbol which is composed of at least one pilot sequence which is mapped on one subcarrier in two of at least a part of subcarriers on which the hybrid symbol is mapped and of discrete Fourier transformed data which are mapped on at least subcarriers comprised between two subcarriers on which the at least one pilot sequence is mapped. The at least one pilot sequence has the property that the variations of amplitudes obtained after performing a discrete Fourier transform over the at least one pilot sequence are limited. The frame also includes other symbols composed of discrete Fourier transformed data only.

Method for transferring data and information enabling an estimate of a wireless link between a source and at least one receiver

A method for deciding if a telecommunication device has to be switched in an operating mode which is different from the operating mode in which the telecommunication is operating. In an operating mode, the telecommunication device relays signals transferred between a terminal and an access node which handles the terminal. In another operating mode, the telecommunication device handles the terminal. The method includes: determining, from obtained information, if a predetermined event occurs, and if the predetermined event occurs, deciding that a handover of the terminal has to be conducted between the access node and the telecommunication device, and deciding that the telecommunication device has to switch in an operating mode which is different from the operating mode in which the telecommunication is operating.

Method and a device for deciding if the operating mode of a telecommunication device has to be switched in a different operating mode

A method for increasing the amount of information bits comprised in a symbol transferred by a source to at least one receiver. The symbol is representative of a modulated base sequence obtained by encoding a sequence of base bits selected by the source and by modulating the encoded selected sequence. The modulated base sequence has fixed points. The source encodes the selected sequence of base bits and a sequence of supplementary bits, obtains a modulated base sequence by modulating the encoded selected sequence of base bits, obtains a modulated altering sequence by modulating the sequence of supplementary bits, alters the modulated base sequence by modifying at least a part of the values of its fixed points using the modulated altering sequence in order to obtain a modulated altered sequence, and transfers the modulated altered sequence under the form of an altered symbol.

Method and a device for increasing the amount of information bits comprised in a symbol

A method for determining a shifting parameter P to be used by a telecommunication device for mapping symbols on sub-carriers, the telecommunication device including at least two transmit antennas, the symbols being transferred through each antenna of the telecommunication device on at least an even number K, strictly greater than two, of sub-carriers allocated to the telecommunication device. The telecommunication device transfers on a first antenna on each sub-carrier 'k', a signal representing a symbol 'X' in the frequency domain. The telecommunication device transfers on a second antenna on each sub-carrier &#x2018;k&#x2019;, a signal representing a symbol &#x2018;X'&#x2019; derived from the signal transferred on the first transmit antenna, for each frequency k, by the formula X&#x2032;=&#x3b5;(&#x2212;1)X*. Sub-carriers grouped in at least two clusters are allocated to the telecommunication device, and the shifting parameter p is even and determined according to clusters of sub-carriers allocated to the telecommunication device.

Method and a device for determining a shifting parameter to be used by a telecommunication device for transferring symbols

A method for identifying at least one terminal for which signals transferred between the at least one terminal and a base station of a wireless cellular telecommunication network have to be relayed by a relay, the base station providing a random access channel enabling a terminal to notify to the base station the presence of the terminal by transferring a random access signal to the base station. The relay device transfers the random access signal to the base station, receives the list, identifies, from the received list, at least one terminal for which signals transferred between the at least one identified terminal and the base station have to be relayed by the relay, and relays signals between the at least one identified terminal and the base station.

Method and a device for identifying at least one terminal for which signals transferred between the at least one terminal and a base station have to be relayed by a relay

A method for determining a corrected estimated variance representative of the condition of reception of signals representative of symbols transferred by an emitter to a receiver through a communication channel. The method includes, executed by the receiver, producing an estimation of the variance by a Wiener channel estimator comprising a linear filter of which coefficients are determined at least from a given average signal to interference plus noise ratio value. The method further includes, executed by the receiver, multiplying the estimation of the variance by a correction factor. The value of the correction factor, being dependent at least on the number of coefficients of the linear filter of the Wiener channel estimator.

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Rennes, France

Damien Castelain