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

• US 7,684,500 B2
• Filed: 03/03/2006
• Issued: 03/23/2010
• Est. Priority Date: 03/07/2005
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Froc, Gwillerm, Paquelet, Stephane
• Primary Examiner(s): Liu; Shuwang
• Assistant Examiner(s): Singh; Hirdepal
• Application Number:
  US11/366,400
• Publication Number:
  US 20060203902A1
• Time in Patent Office: 1,481 Days
• Field of Search: 375/130, 375/135, 375/136, 375/145, 375/146, 375/256, 375/260, 375/287, 375/295, 375/316, 375/132, 375/316.342, 375/343, 375/354, 375/259, 370/203, 370/294, 370/464, 370/483, 455/101, 455/102, 455/522, 455/574
• US Class Current: 375/259
• CPC Class Codes: H04B 1/7183 Synchronisation

Abstract

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.

Claims

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

transmitting, from said transmitter, a signal formed by at least one reference sequence including a predetermined number of pulses dispatched over a same predetermined number of time windows, each pulse of the reference sequence being enclosed within a time chip whose position within its relevant time window is defined by a chip number;

receiving, at the receiver, the signal transmitted by the transmitter;

computing, at the receiver, at least one detection value representative of an amount of power carried by the received signal by integrating the received signal over a time duration which is tunable; and

comparing, at the receiver, the computed detection value to at least one predetermined threshold value,

wherein the detection value is computed by selecting an initial number of time windows for constituting an initial detection pattern and performing an initial cycle of successive integrations of the received signal over successive time-shifted detection patterns, each integration being followed by a comparison of the resulting detection value with the predetermined threshold value, said initial cycle being carried out until a detection value is found higher than said predetermined threshold value, or until all possible beginnings of a transmitted pulse sequence will have been covered by each first window of each time-shifted detection pattern, in which case the number of the time windows to be included in the detection pattern is increased and a new cycle of successive integrations is performed.

2. A method as claimed in claim 1, wherein the detection value is computed by integrating the received signal over at least one series of time windows whose respective positions are defined by chip numbers of an expected reference sequence, said time windows having a width which is tunable.

3. A method as claimed in claim 2, wherein the width of said time windows is adapted by choosing an initial setting for said width and performing a first cycle of successive integrations of the received signal over successive shifted series of time windows, until a detection value is found higher than a predetermined threshold value, or until all possible beginnings of a reference pulse sequence will have been covered by each first window of each series, in which case the value of the width of said time windows is increased and a new cycle of successive integrations is performed.

4. A telecommunication system, comprising:

a transmitter configured to transmit a signal formed by at least one reference sequence including a predetermined number of pulses dispatched over a same predetermined number of time windows, each pulse of the reference sequence being enclosed within a time chip whose position within its relevant time window is defined by a chip number; and

a receiver configured to receive the signal, compute at least one detection value representative of an amount of power carried by each pulse sequence by integrating the received signal over a time duration which is tunable and compare said detection value to at least one predetermined threshold value,

wherein the detection value is computed by selecting an initial number of time windows for constituting an initial detection pattern and performing an initial cycle of successive integrations of the received signal over successive time-shifted detection patterns, each integration being followed by a comparison of the resulting detection value with the predetermined threshold value, said initial cycle being carried out until a detection value is found higher than said predetermined threshold value, or until all possible beginnings of a transmitted pulse sequence will have been covered by each first window of each time-shifted detection pattern, in which case the number of the time windows to be included in the detection pattern is increased and a new cycle of successive integrations is performed.

5. A device intended to receive a signal formed by at least one reference sequence including a predetermined number of pulses dispatched over a same predetermined number of time windows, each pulse of the reference sequence being enclosed within a time chip whose position within its relevant time window is defined by a chip number, the device comprising:

a detector configured to compute at least one detection value representative of an amount of power carried by each pulse sequence by integrating the received signal over a time duration which is tunable, and compare said detection value to at least one predetermined threshold value,

wherein the detection value is computed by selecting an initial number of time windows for constituting an initial detection pattern and performing an initial cycle of successive integrations of the received signal over successive time-shifted detection patterns, each integration being followed by a comparison of the resulting detection value with the predetermined threshold value, said initial cycle being carried out until a detection value is found higher than said predetermined threshold value, or until all possible beginnings of a transmitted pulse sequence will have been covered by each first window of each time-shifted detection pattern, in which case the number of the time windows to be included in the detection pattern is increased and a new cycle of successive integrations is performed.