Mitsubishi Denki Kabushiki Kaisha

Stephane Paquelet

Louis-Marie Aubert

Bernard Uguen

Gwillerm Froc

Jean-Baptiste Dore

Claire Meunier

The present invention relates to a method for transmitting data in the form of at least one pulse sequence Tsgk (for k=1 to K). The method according to the invention includes at least one symbol decoding step in the course of which at least one modulation value Pwk representative of an amount of power carried by each pulse sequence Tsgk is computed and compared to at least one predetermined threshold value Thvk, which will be computed beforehand by equating a first and a second probability density function representing a likelihood for the transmitted signal to carry a first symbol and a likelihood for the transmitted signal to carry a second symbol, respectively. The method according to the invention enables to limit the processing time and power needed for performing the demodulation of a power-modulated UWB signal.

Method for demodulating UWB pulse sequences encoded according to an on-off keying modulation scheme

The present invention relates to a method for transmitting data in the form of at least one sequence Tsg of Ns pulses, each pulse being enclosed within a predetermined time chip Tc. The method according to the invention includes at least one symbol encoding step, in the course of which each pulse pj (for j=1 to Ns) of an ith pulse sequence Tsg is multiplied by a value Vi representative of a symbol to be carried by said sequence. By virtue of the invention, the information carried by the pulse sequence Tsg will essentially be represented by the power carried by this sequence Tsg, which power is related to the amplitude of the pulses pj. This information may then be recovered by a receiver without said receiver having to map precisely, with respect to time, the received pulse sequences.

Method for modulating UWB pulse sequences

A method for transmitting data in the form of at least one pulse sequence included in a transmitted signal. The method includes calculating at least one detection value representative of an amount of power carried by the pulse sequence by performing integration over a tunable time duration, and comparing the detection value to at least one predetermined threshold value.

Method for detecting UWB pulse sequences in a cost-efficient manner

A telecommunication system including a receiver to receive a signal including a sequence of Np pulses, each pulse included in a separate time window, and each pulse enclosed within a time chip whose position within the corresponding time window is defined by a chip number that is included in a known signature; and a detector configured to detect Np pulses in each of the separate time windows by using Np detection windows, a location of the detection windows defined by the known signature, the detection windows being shorter than the separate time windows, and longer than the time chip duration of the time chips, to search an expected pulse sequence.

Method for detecting UWB pulse sequences and detection means suitable for this purpose

The present invention relates to a method for transmitting data in the form of at least one pulse sequence Tsgk (for k=1 to K). The method according to the invention includes at least one symbol decoding step in the course of which at least one modulation value Pwk representative of an amount of power carried by each pulse sequence Tsgk is computed and compared to at least one predetermined threshold value thk, thkthkM(k). The method according to the invention enables to limit the processing time and power needed for performing the demodulation of a power-modulated UWB signal, since the information carried by such a signal may be recovered by a receiver without said receiver having to map precisely, with respect to time, the received pulse sequences.

Method for demodulating UWB pulse sequences

The present invention relates to a method for transmitting data by means of at least one pulse sequence carried by a radio signal, in the course of which a power value representative of an amount of power carried by said pulse sequence is computed. The method according to the invention provides estimated values of noise affecting the radio transmission and of an amount of power which would be carried by each pulse sequence in the absence of noise, respectively, prior to the determination of a threshold value to which the power value is to be compared. The knowledge of such estimated values enables to compute a threshold value adapted to the communication conditions affecting any given pulse sequence, and hence to perform an optimal demodulation of any power-modulated UWB signal.

Method for estimating communication conditions affecting an UWB wireless link

The present invention relates to a method for transmitting data in the form of at least one sequence of Np pulses over Np time windows Tf, each pulse being enclosed within a time chip Tc whose position within its relevant time window is defined by a chip number. The method according to the invention, includes at least one signal detection step, in the course of which Np detection windows Dj (for j=1 to Np) encompassing the time chips defined by the chip numbers are to be examined in search of an expected pulse sequence. The method according to the invention enables to limit the processing time and power needed for carrying out the detection step, which only requires to scan detection windows defined by the signature of a transmitter, instead of mapping the whole pulse sequence.

Method for detecting UWB pulse sequences and analog detection means suitable for this purpose

The invention relates to a method for transmitting at least one sequence of Np pulses over Np time windows, each pulse being enclosed within a predetermined time chip Tc. The method according to the invention includes a signal detection step, in the course of which Np detection windows Dj. (for j=1 to Np) encompassing predetermined time chips are examined by performing correlations over said detection windows Dj of the received signal with at least a first and a second sinusoidal signal Sand S The method according to the invention enables to limit the processing time and power needed for carrying out the detection step, which only requires to examine detection windows defined by a signature of a transmitter by using sinusoidal signals, instead of mapping the whole pulse sequence by means of a correlation with expected pulses.

Method for detecting UWB pulse sequences without local pulse generation

The present invention relates to a system for transmitting data in the form of at least one sequence of pulses. A transmitter included in the system according to the invention comprises symbol encoding means ENC including at least one pulse generator PLSG, and at least one signal multiplier SGMk (for k=1 to K) for multiplying at least one pulse sequence Psqk with a tunable coding value defined by a control word WDk. By virtue of the invention, the information carried by a transmitted signal Tsg will essentially be represented by the power carried by at least one pulse sequence included in said signal Tsg, which power is related to the amplitude of the pulses. This information may then be recovered by a receiver without said receiver having to map precisely, with respect to time, the received pulse sequences.

System and device for modulating UWB pulse sequences

A method for transmitting data in the form of pulse sequences, including a signal synchronization step carried out by a receiver of dataframes DF, in the course of which at least one time window &#x394;T() is scanned in search of the beginning PSB of a pulse sequence. The time window is then subdivided into a predefined number of sub-windows &#x394;T(). The sub-windows are then scanned during further signal detection steps until the beginning PSB of the pulse sequence has been detected within one of the sub-windows which will then be substituted for the previous time window AT(), until the width of the resulting sub-windows becomes smaller than a predetermined minimum width.

Method for identifying the beginning of a UWB pulse sequence

The invention relates to a method for transmitting at least one sequence of Np pulses over Np time windows, each pulse being enclosed within a predetermined time chip Tc. The method according to the invention includes a signal characterization step, in the course of which Np detection windows Dj (for j=1 to Np) encompassing predetermined time chips are examined by performing correlations over the detection windows Dj of the received signal with at least a first and a second sinusoidal signal Sand S.The method according to the invention enables to limit the processing time and power needed for carrying out the characterization step, which only requires to examine detection windows defined by a signature of a transmitter by using sinusoidal signals, instead of mapping the whole pulse sequence by a correlation with expected pulses.

Method and device for characterizing ultra-wide band (UWB) pulse sequences

A system to transmit data in the form of at least one pulse sequence modulated by symbol encoding units. The symbol encoding units include a plurality of signal encoders (ENCi) connected to a plurality of antennas, pulse generating units (PGi) for delivering a basic pulse sequence (PSQi), first energy splitting units (ENSPi) for splitting basic pulse sequence into sub-sequences (Psqi-PsqiK), signal modulating units (SGM-SGMK) for applying to the sub-sequence a tunable coefficient, and combination units (CMBMi) for combining the sub-sequences (Tsgi-TsgiK) into a signal (Tsgi) to be transmitted by the antenna (ANTi) to which the encoder (ENCi) is connected. Each signal encoder (ENCi) is linked to a single antenna (ANTi).

UWB telecommunication system and communication device to be used therein

The invention relates to a transmission method for transmitting data symbols to or from users of an ultra bandwidth telecommunication system, each user (u) of said system being associated with a specific time hopping pattern consisting of a plurality (N, N) of integers (c), the signal transmitted to or from a user consisting of sequences of the same plurality of frames, each integer of said pattern being associated with a corresponding frame and each frame containing a pulse time-shifted from the beginning thereof by an amount (cT) determined by said associated integer, the pulses of one sequence being further position modulated by one or a plurality (n) of data symbols to be transmitted to or from said user. According to the transmission method of the invention, the time at which a sequence of a user is transmitted is obtained from a pseudo-random sequence specific to said user. The invention equally relates to the corresponding transmitter.

Growing community of inventors

Rennes, France

Stephane Paquelet