Intermittent uwb receiver

Patent metadata

Field	Value
Publication number	US-2016261307-A1
Application number	US-201415028647-A
Country	US
Kind code	A1
Filing date	Oct 10, 2014
Priority date	Oct 18, 2013
Publication date	Sep 8, 2016
Grant date	—

Abstract

A UWB impulse receiver including an RF stage followed by a baseband processing stage. The baseband processing stage includes a Rake filter including a plurality of time fingers, each finger including an integrator of the baseband signal during an acquisition window, a control module, and a detection module estimating the received symbols from the integration results. During a synchronization phase, the control module drives respective positions of the acquisition windows associated with the different fingers, to scan at a reception interval, the RF stage only operating, in a course of the synchronization phase, during the plurality of acquisition windows.

First claim

1 - 11 . (canceled)

12 . A UWB impulse signal receiver, the UWB signal being time-divided into unit intervals of a predetermined duration, a symbol being transmitted over a plurality N of unit intervals, each unit interval including a unit impulse, the UWB signal including a synchronization preamble followed by a payload, the synchronization preamble including a sequence of M identical symbols, the receiver comprising:
an RF stage followed by a baseband processing stage, the RF stage being configured to amplify the signal and to carry out a translation into baseband of the amplified signal, wherein the baseband processing stage comprises:
a rake processor comprising a plurality K of time fingers, each time finger configured to carry out a processing of an acquisition window associated with the finger;
a detection module to estimate at least one received symbol from processing results supplied by the fingers;
a control module configured to control respective positions of the acquisition windows within a reception interval, to scan the interval in a course of a synchronization phase, the RF stage only operating, in a course of the synchronization phase, during the plurality of acquisition windows.

13 . The UWB impulse signal receiver according to claim 12 , wherein the processing is an integration, each time finger integrating the baseband signal in the acquisition window associated with this finger.

14 . The UWB impulse signal receiver according to claim 13 , wherein the control module drives the time windows so that the time windows drift by a predetermined time pitch from one reception interval to a following reception interval.

15 . The UWB impulse signal receiver according to claim 13 , wherein the RF stage comprises a low noise amplifier followed by a first quadrature mixing stage supplying an in-phase channel and a quadrature channel.

16 . The UWB impulse signal receiver according to claim 15 , wherein the RF stage comprises a pair of low pass or band-pass filters of controllable cut-off frequencies, the pair of filters respectively filtering the in-phase channel and the quadrature channel.

17 . The UWB impulse signal receiver according to claim 15 , wherein the RF stage comprises a second mixing stage translating into baseband the in-phase channel to supply first and second orthogonal signals and the quadrature channel to supply third and fourth orthogonal signals.

18 . The UWB impulse signal receiver according to claim 15 , wherein the RF stage comprises a second mixing stage projecting the in-phase channel on an orthogonal base of reference signals, to supply first and second orthogonal signals, and projecting the quadrature channel on a same base, to supply third and fourth orthogonal signals.

19 . The UWB impulse signal receiver according to claim 17 , wherein each time finger comprises first, second, third, and fourth integrators to respectively integrate the first, second, third, and fourth orthogonal signals on the acquisition window associated with the finger, integration results from these integrators being supplied to the detection module.

20 . The UWB impulse signal receiver according to claim 19 , wherein the integration results from the first, second, third, and fourth integrators are digitized in first, second, third, and fourth analog/digital converters before being supplied to the detection module.

21 . The UWB impulse signal receiver according to claim 12 , wherein powering of the RF stage is cut-off outside the plurality of acquisition windows.

22 . The UWB impulse signal receiver according to claim 12 , wherein at an end of synchronization phase, energies respectively received in the acquisition windows, in a course of the receiving scanning, are compared to each other and a second plurality of time positions is determined corresponding to highest received energies, acquisition windows of the rake processor being respectively positioned on the second plurality of time positions in a payload reception phase following the synchronization phase.

Assignees

• Commissariat L Energie Atomique Et Aux Energies Alternatives
• Commissariat Energie Atomique

Inventors

• Hameau Frederic
• Masson Gilles
• Ouvry Laurent

Classifications

• H04B2201/7163

  Orthogonal indexing scheme relating to impulse radio · CPC title

• H04B2201/70979

  Fat finger issues in RAKE receivers · CPC title

• H04B2201/7073

  Direct sequence modulation synchronisation · CPC title

• H04B2201/70707

  Efficiency-related aspects · CPC title

• H04B1/7115

  Constructive combining of multi-path signals, i.e. RAKE receivers · CPC title