Method for demodulating UWB pulse sequences encoded according to an on-off keying modulation scheme
First Claim
1. ) A method for transmitting data in a telecommunication system including at least one transmitter and one receiver, said transmitter being intended to transmit a signal formed by at least one pulse sequence of Ns pulses over Ns time windows, each pulse being enclosed within a time chip whose position whithin its relevant time window is defined by a chip number, which method includes at least one symbol decoding step to be executed at the receiver end, in the course of which symbol decoding step at least one modulation value representative of an amount of power carried by each pulse sequence is computed and compared to at least one predetermined threshold value, which threshold value will have been 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.
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Abstract
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.
9 Citations
11 Claims
- 1. ) A method for transmitting data in a telecommunication system including at least one transmitter and one receiver, said transmitter being intended to transmit a signal formed by at least one pulse sequence of Ns pulses over Ns time windows, each pulse being enclosed within a time chip whose position whithin its relevant time window is defined by a chip number, which method includes at least one symbol decoding step to be executed at the receiver end, in the course of which symbol decoding step at least one modulation value representative of an amount of power carried by each pulse sequence is computed and compared to at least one predetermined threshold value, which threshold value will have been 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.
- 7. ) A telecommunication system including at least one transmitter and one receiver, said transmitter being intended to transmit a signal formed by at least one pulse sequence of Ns pulses over Ns time windows, each pulse being enclosed within a time chip whose position whithin its relevant time window is defined by a chip number, system in which the receiver includes symbol decoding means intended to compute at least one modulation value representative of an amount of power carried by each pulse sequence and to compare said modulation value to at least one predetermined threshold value obtained by equating a first and a second probability density function representing the likelihood for the transmitted signal to carry a first symbol and the likelihood for the transmitted signal to carry a second symbol, respectively.
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10. ) A device intended to receive a signal formed by at least one sequence of Ns pulses over Ns time windows, each pulse being enclosed within a time chip whose position whithin its relevant time window is defined by a chip number, which receiver includes symbol decoding means intended to compute at least one modulation value representative of an amount of power carried by each pulse sequence and to compare said modulation value to at least one predetermined threshold value obtained by equating a first and a second probability density function representing the likelihood for the transmitted signal to carry a first symbol and the likelihood for the transmitted signal to carry a second symbol, respectively.
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11. ) A device intended to transmit a signal formed by at least one sequence of Ns pulses over Ns time windows, each pulse being enclosed within a time chip whose position whithin its relevant time window is defined by a chip number, which transmitter includes symbol encoding means intended to multiply each pulse sequence by one of two integer values representative of a symbol to be carried by said pulse sequence.
Specification