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

• US 7,580,464 B2
• Filed: 07/30/2004
• Issued: 08/25/2009
• Est. Priority Date: 07/30/2003
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Paquelet, Stephane
• Primary Examiner(s): Ha; Dac V
• Application Number:
  US10/902,118
• Publication Number:
  US 20050058211A1
• Time in Patent Office: 1,852 Days
• Field of Search: 375/130, 375/140, 375/141, 375/142, 375/147, 375/256, 375/340, 375/343
• US Class Current: 375/256
• CPC Class Codes: H04B 1/7163 using impulse radio
• CPC Class Codes: H04B 1/7176 Data mapping, e.g. modulation

Abstract

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.

Claims

1. A method for transmitting data in a telecommunication system including at least one transmitter and one receiver, the method comprising:

transmitting a signal from said transmitter to the receiver, the signal including at least one sequence of an integer number Np of pulses over Np time windows, each pulse being enclosed within a time chip having a position within a relevant time window defined by a chip number;

evaluating, for only one detection window in each of the Np time windows, a correlation between the received signal and a pulse in an expected pulse sequence, each detection window being shorter in duration than each of the Np time windows and longer in duration than the time chip; and

determining, at the receiver, that the detection windows in the Np time windows include the expected pulse sequence based on the correlation of the one detection window in each of the Np time windows.

2. A method as claimed in claim 1, further comprising:

computing a mean value of the correlation evaluated for the detection window in each of the Np time windows;

computing a detection value defined by the mean value of the correlation evaluated for each of the Np time windows;

signal and a series of Np expected pulse and

the determining further comprises comparing the detection value to a predetermined threshold value.

4. The method of claim 1, further comprising:

computing a mean value of a square value of the correlation evaluated for the detection window in each of the Np time windows; and

the determining further comprises comparing the computed mean value to a predetermined threshold.

5. A method as claimed in any one of claims 2 or 3, wherein the predetermined threshold value is independent of an amplitude of the received signal.

3. A method for transmitting data in a telecommunication system including at least one transmitter and one receiver, said transmitter configured to transmit a signal formed by at least one sequence of an integer number Np of pulses over Np time windows, each pulse being enclosed within a time chip having a position within a relevant time window defined by a chip number, the method comprising at least one signal detection step of examining Np detection windows encompassing the time chips defined by the chip numbers in search of an expected pulse sequence,

wherein the examining Np detection windows includes computing a detection value defined by a mean value over all detection windows of a squared value of a correlation between the received signal and a series of Np expected pulse forms, and the method further comprises comparing the detection value to a predetermined threshold value.

6. A telecommunication system comprising:

at least one transceiver including a transmitter; and

one receiver,

said transmitter is configured to transmit a signal including at least one sequence of an integer number Np of pulses over Np time windows, each pulse enclosed within a time chip having a position within a relevant time window defined by a chip number, and

the receiver includes a signal detector configured to receive the signal, evaluate, for only one detection window in each of the Np time windows, a correlation between the received signal and a pulse in an expected pulse sequence, each detection window being shorter in duration than each of the Np time windows and longer in duration than the time chip, and determine that the detection windows in the Np time windows include the expected pulse sequence based on the correlation of the one detection window in each of the Np time windows.

7. A telecommunication system as claimed in claim 6, wherein the signal detector includes a computation device configured to compute a mean value of the correlation, compute a detection value defined by the mean value of the correlation, and compare said detection value to a predetermined threshold value to determine that the detection windows in the Np time windows include the expected pulse sequence.

8. The system of claim 6, wherein the signal detector is further configured to compute a mean value of a square value of the correlation evaluated for the detection window in each of the Np time windows;

and

compare the mean value to a predetermined threshold value to determine that the detection windows in the Np time windows include the expected pulse sequence.

9. A telecommunication system comprising:

at least one transceiver including a transmitter; and

one receiver,

said transmitter is configured to transmit a signal formed by at least one sequence of an integer number Np of pulses over Np time windows, each pulse enclosed within a time chip having a position within a relevant time window defined by a chip number, and the receiver includes a signal detector configured to receive the signal, and examine Np detection windows encompassing the time chips defined by the chip numbers in search of an expected pulse sequence, wherein the signal detector includes a computation device configured to compute a detection value defined by a mean value over the Np detection windows of a squared value of a correlation between the received signal and a series of Np expected pulse forms, and a comparison device configured to compare said detection value to a predetermined threshold value.

10. A telecommunication system as claimed in claim 9, in which the computation device includes:

a plurality of correlating modules, each of which configured to be activated during the Np detection windows and to compute a correlation over said detection windows between the signal received by the receiver and a characteristic signal associated with said correlating module,

a plurality of accumulating modules, each of which is configured to accumulate output values delivered by one of said correlating modules,

a plurality of squaring modules, each of which configured to produce a squared value of the contents of one of said accumulating modules, and

an additioner configured to compute a sum of output values delivered by the squaring modules in order to produce a detection value which will be compared to the predetermined threshold value.

11. A device configured to receive a signal including at least one sequence of an integer number Np of pulses over Np time windows, each pulse enclosed within a time chip having a position within a relevant time window defined by a chip number, the device comprising:

a signal detector configured to evaluate, for only one detection window in each of the Np time windows, a correlation between the received signal and a pulse in an expected pulse sequence, each detection window being shorter in duration than each of the Np time windows and longer in duration than the time chip, and

determine that the detection windows in the Np time windows include the expected pulse sequence based on the correlation of the one detection window in each of the Np time windows.

12. The device of claim 11, wherein the signal detector is further configured to compute a mean value of the correlation evaluated for the detection window in each of the Np time windows, and compare the mean value to a predetermined value to determine that the detection windows in the Np time windows include the expected pulse sequence.

13. A method for transmitting data in a telecommunication system including at least one transmitter and one receiver, the method comprising:

transmitting a signal from said transmitter to the receiver, the signal including at least one sequence of an integer number Np of pulses over Np time windows, each pulse being enclosed within a time chip having a position within a relevant time window defined by a chip number;

evaluating, for only one detection window in each of the Np time windows, a correlation between the received signal and a pulse in an expected pulse sequence, each detection window being shorter in duration than each of the Np time windows and longer in duration than the time chip;

computing a sum of the correlation evaluated for the detection window in each of the Np time windows; and

determining, at the receiver, that the detection windows in the Np time windows include the expected pulse sequence based on the computed sum.