WO2004017655A1 - Perfectionnements relatifs a des recepteurs radio sans fil - Google Patents

Perfectionnements relatifs a des recepteurs radio sans fil Download PDF

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Publication number
WO2004017655A1
WO2004017655A1 PCT/IB2003/003495 IB0303495W WO2004017655A1 WO 2004017655 A1 WO2004017655 A1 WO 2004017655A1 IB 0303495 W IB0303495 W IB 0303495W WO 2004017655 A1 WO2004017655 A1 WO 2004017655A1
Authority
WO
WIPO (PCT)
Prior art keywords
receiver
propagation environment
signal processing
signal
algorithms
Prior art date
Application number
PCT/IB2003/003495
Other languages
English (en)
Inventor
Anne C. Caswell
Catharina J. H. Van Dam
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to AU2003255883A priority Critical patent/AU2003255883A1/en
Publication of WO2004017655A1 publication Critical patent/WO2004017655A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/7103—Interference-related aspects the interference being multiple access interference
    • H04B1/7105—Joint detection techniques, e.g. linear detectors
    • H04B1/71055—Joint detection techniques, e.g. linear detectors using minimum mean squared error [MMSE] detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70707—Efficiency-related aspects
    • H04B2201/7071—Efficiency-related aspects with dynamic control of receiver resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC

Definitions

  • the present invention relates to wireless radio receivers having particular, but not exclusive, application to receivers operating in accordance with third generation cellular telephone standards (3G or UMTS).
  • the present invention may also be applied to handheld radio devices, for example mobile phones operating in accordance with GSM, IS95, wireless local area networks (LANS) such as those operating in accordance with IEEE 802.11 standard, digital cordless phones, for example DECT phones, and private mobile radio devices.
  • Adaptive equalisers have been studied widely to enable a receiver to change its characteristic according to its operating environment. These, however, still rely on using the same algorithm at all times and just adapting the weights of the taps to adjust the performance or in the extreme turning the equaliser fully off.
  • US Patent Specification US 2001/0036222 discloses a mobile radio telephone receiver having a RAKE receiver portion in which the power consumption in one or more RAKE fingers is reduced selectively in consideration of one or more estimated path parameters. More particularly, the power consumption of the RAKE receiver portion can be adapted to the instantaneous state of the mobile radio channel and thereby minimised. The power consumption in a RAKE receiver can be reduced by reducing its processing rate or disconnecting a finger.
  • One method by which the RAKE finger selection and power consumption device cuts off a RAKE finger is when the estimated path energy of the path allocated to this RAKE finger is less than a threshold value that is a function of a mean value of the estimated path energies and a variance of the estimated path energies.
  • a characteristic of this cited receiver is that the power consumption saving is dependent on criteria decided by the equipment manufacturer rather than only by the operating environment which can exhibit difficulties for a radio receiver trying to detect accurately the required signals. Examples of difficult operating environments are heavily multipath environments and those with large numbers of other radio signals which interfere with the wanted signal.
  • An object of the present invention is to enable a wireless radio device to be able to reconfigure itself to a current radio environment and in so doing to be able to optimise on the use of power and performance.
  • a method of operating a wireless radio receiver comprising monitoring the propagation environment and configuring the processing of a received signal in accordance with one of at least two predetermined signal processing algorithms selected in response to the nature of the monitored propagation environment.
  • a wireless radio receiver comprising means for monitoring the propagation environment, means for producing at least two signal processing algorithms, and means responsive to the nature of the monitored propagation environment for selecting the production of one of the at least two signal processing algorithms and for processing the received signal accordingly.
  • the present invention is based on the concept that a receiver selects the algorithm to be used in processing a received signal to suit the current propagation environment and in so doing optimises the battery power consumption whilst maintaining an acceptable receiver performance
  • the architecture of the device will determine how the method in accordance with the present invention can be implemented.
  • a RAKE radio receiver may be able to demodulate accurately a desired signal in a multipath environment but when there are a number of other users also present in say a wireless channel it cannot deal with the multiple access interference produced by cross correlations with these other users' signals.
  • the receiver performance can be improved by reconfiguring the receiver to become an equaliser.
  • Figure 1 is a block schematic diagram of a receiver (or receiver section) of a battery powered radio device
  • Figure 2 is a flow chart illustrating an implementation of the method in accordance with the present invention
  • the mobile radio device comprises an antenna 10 coupled to a RF front end 12 which produces a base band signal which is digitised in an analog-to-digital converter (ADC) 14.
  • a signal processing stage 16 which provides in the present example five preselected signal processing algorithms for operating on the digitised signal, is coupled to an output of the ADC 14.
  • a decoding stage 18 is coupled to an output of the signal processing stage 16.
  • the RF front end 12 is also coupled to a circuit 20 for monitoring the radio propagation environment.
  • the circuit monitors one or more characteristics selected from RSSI (radio signal strength indicator), CRCs within the signal, pilot signals, pilot bits within a received signal, for example the CPICH channel for UMTS, or a synchronisation sequence, for example the sync, code word for Bluetooth, Registered Trade Mark, or for DECT.
  • RSSI radio signal strength indicator
  • CRCs radio channel quality indicator
  • pilot signals for example the CPICH channel for UMTS
  • pilot bits within a received signal for example the CPICH channel for UMTS
  • a synchronisation sequence for example the sync, code word for Bluetooth, Registered Trade Mark, or for DECT.
  • tap weights of an adaptive equaliser may be monitored to provide an indication of the quality of the signal channel.
  • the monitoring circuit 20 includes a processor (not shown) which has outputs 22, 24 for controlling switches 26,28 for selecting one of five signal processing algorithms in response to the results of monitoring the signal propagation environment.
  • a second RF path shown in broken lines is provided.
  • the second path comprises an antenna 30 coupled to a RF front end 32 which in turn is coupled to an ADC 34.
  • An output of the ADC 34 is coupled to an input of the signal processing stage 16.
  • a switch 36 controlled by the circuit 20 is provided to select one or other of the antennas 10, 30 or if required both of the antennas.
  • the signal processing stage 16 is able to generate five different signal processing algorithms which for convenience of illustration are represented by five parallel arranged blocks 40, 42, 44 46 and 48 coupled between outputs of the switch 26 and the inputs of the switch 28.
  • the algorithms comprise (1) a 4 finger Rake operation, block 40, (2) switchable antennas with 4 finger RAKE, block 42, (3) MMSE (Minimum - Mean - Square - Estimator) equaliser, block 44, (4) diversity plus 4 finger Rake operation, block 46, and (5) diversity plus MMSE equalisation, block 48.
  • Power consumption progresses upwards from Algorithm (1) to Algorithm (5).
  • the method in accordance with the present invention will now be described reference to the flow chart shown in Figure 2.
  • Block 50 denotes the receiver being switched-on.
  • Block 52 denotes the processing stage selecting a predetermined default one of the five algorithms (1) to (5) or the previously selected algorithm in the event of there not being a predetermined default algorithm.
  • Block 54 denotes processing the received signal using the currently selected algorithm.
  • Block 56 denotes the signal propagation environment being monitored by the monitoring circuit 20 ( Figure 1).
  • Block 58 denotes checking that currently selected algorithm is the best suited to the propagation environment. If it is (Y), the flow chart reverts to the block 54. If it is not (N), then in block 60 a check is made if another algorithm should be selected. If the answer is No (N), the flow chart reverts to the block 54. If the answer is Yes (Y) then block 62 denotes the processing stage selecting another one of the five algorithms. The flow chart reverts to the block 54.
  • a receiver operating in a cellular environment in a built- up area with many buildings, that is heavily multipath, and using a radio channel having only a few other users on it may be configured to act as a 6 path RAKE receiver. If more users enter the same cell or the user moves to the edge of the cell so the receiver picks-up interference from not just the other users in its cell but also from those in the adjacent cell, the receiver on detecting this deterioration in the signal propagation environment reconfigures its architecture to perform equalisation, and in so doing removes multiple access interference.
  • the radio in response to detecting this change in the radio propagation environment reconfigures itself to use only switchable antennas with a simple RAKE thereby minimising the drain on the batteries.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un récepteur radio sans fil, tel qu'un téléphone cellulaire, qui comporte un étage (16) pour traiter un signal radio reçu conformément à un algorithme choisi parmi plusieurs algorithmes possibles (40 à 48) sélectionnés en réponse à la surveillance de l'environnement de propagation des signaux. Ces algorithmes fournissent un compromis entre le degré de traitement des signaux et la consommation de courant.
PCT/IB2003/003495 2002-08-16 2003-08-06 Perfectionnements relatifs a des recepteurs radio sans fil WO2004017655A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003255883A AU2003255883A1 (en) 2002-08-16 2003-08-06 Improvements in or relating to wireless radio receivers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0219213A GB0219213D0 (en) 2002-08-16 2002-08-16 Improvements in or relating to wireless radio receivers
GB0219213.6 2002-08-16

Publications (1)

Publication Number Publication Date
WO2004017655A1 true WO2004017655A1 (fr) 2004-02-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2003/003495 WO2004017655A1 (fr) 2002-08-16 2003-08-06 Perfectionnements relatifs a des recepteurs radio sans fil

Country Status (3)

Country Link
AU (1) AU2003255883A1 (fr)
GB (1) GB0219213D0 (fr)
WO (1) WO2004017655A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004109947A1 (fr) * 2003-06-02 2004-12-16 Qualcomm Incorporated Appareil recepteur avec egaliseur hybride et recepteur rake, et technique de reception correspondante
FR2886789A1 (fr) * 2005-06-03 2006-12-08 France Telecom Dispositif et procede de selection d'un recepteur en fonction de l'environnement
WO2007031691A1 (fr) * 2005-09-14 2007-03-22 France Telecom Procede et dispositif de configuration d'un recepteur dans un dispositif de communication.
WO2008012522A1 (fr) 2006-07-28 2008-01-31 Ttpcom Limited Procédé de traitement de signal reconfigurable
EP2012439A3 (fr) * 2007-07-02 2010-09-01 Fujitsu Limited Récepteur et procédé de traitement de réception
US7983364B2 (en) 2007-09-13 2011-07-19 Samsung Electronics Co., Ltd. Wireless receiver supporting multiple algorithms and algorithm selection method thereof
WO2012128793A1 (fr) * 2010-11-16 2012-09-27 Qualcomm Incorporated Sous-système de récepteur d'extrémité frontale de démodulation (demfront) à optimisation de puissance
US9385833B2 (en) 2011-06-14 2016-07-05 Optis Cellular Technology, Llc Device and method for controlling interference
DE102017116273A1 (de) * 2017-03-30 2018-10-04 Riedel Communications International GmbH Netzwerkgerät für ein Intercom-Netzwerk

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5428664A (en) * 1992-03-19 1995-06-27 Nec Corporation Dual mode portable telephone which prevents power being applied to the analog or digital signal processors not selected for communication
WO2000041327A2 (fr) * 1998-12-31 2000-07-13 Nokia Networks Oy Procede de reception et recepteur associe
GB2371725A (en) * 2001-01-24 2002-07-31 Ubinetics Ltd A rake receiver wherein each finger has a DLL and at least one has early and late correlators connected via a controllable bandwidth filter to a subtractor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5428664A (en) * 1992-03-19 1995-06-27 Nec Corporation Dual mode portable telephone which prevents power being applied to the analog or digital signal processors not selected for communication
WO2000041327A2 (fr) * 1998-12-31 2000-07-13 Nokia Networks Oy Procede de reception et recepteur associe
GB2371725A (en) * 2001-01-24 2002-07-31 Ubinetics Ltd A rake receiver wherein each finger has a DLL and at least one has early and late correlators connected via a controllable bandwidth filter to a subtractor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LATVA-AHO M ET AL: "Reconfigurable adaptive RAKE receiver for wideband CDMA systems", VEHICULAR TECHNOLOGY CONFERENCE, 1998. VTC 98. 48TH IEEE OTTAWA, ONT., CANADA 18-21 MAY 1998, NEW YORK, NY, USA,IEEE, US, 18 May 1998 (1998-05-18), pages 1740 - 1744, XP010288219, ISBN: 0-7803-4320-4 *

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8391337B2 (en) 2003-06-02 2013-03-05 Qualcomm Incorporated Communication receiver with hybrid equalizer
WO2004109947A1 (fr) * 2003-06-02 2004-12-16 Qualcomm Incorporated Appareil recepteur avec egaliseur hybride et recepteur rake, et technique de reception correspondante
US7646802B2 (en) 2003-06-02 2010-01-12 Qualcomm Incorporated Communication receiver with hybrid equalizer
FR2886789A1 (fr) * 2005-06-03 2006-12-08 France Telecom Dispositif et procede de selection d'un recepteur en fonction de l'environnement
WO2006131665A1 (fr) * 2005-06-03 2006-12-14 France Telecom Dispositif et procede de selection d'un recepteur en fonction de l'environnement
WO2007031691A1 (fr) * 2005-09-14 2007-03-22 France Telecom Procede et dispositif de configuration d'un recepteur dans un dispositif de communication.
CN101491043B (zh) * 2006-07-28 2014-04-16 开曼晨星半导体公司 一种改善信道效应的装置及方法
US8422542B2 (en) 2006-07-28 2013-04-16 Mstar Semiconductor, Inc. Reconfigurable signal processing scheme
WO2008012522A1 (fr) 2006-07-28 2008-01-31 Ttpcom Limited Procédé de traitement de signal reconfigurable
US8208589B2 (en) 2007-07-02 2012-06-26 Fujitsu Limited Receiver and reception processing method
EP2012439A3 (fr) * 2007-07-02 2010-09-01 Fujitsu Limited Récepteur et procédé de traitement de réception
US7983364B2 (en) 2007-09-13 2011-07-19 Samsung Electronics Co., Ltd. Wireless receiver supporting multiple algorithms and algorithm selection method thereof
WO2012128793A1 (fr) * 2010-11-16 2012-09-27 Qualcomm Incorporated Sous-système de récepteur d'extrémité frontale de démodulation (demfront) à optimisation de puissance
US9385833B2 (en) 2011-06-14 2016-07-05 Optis Cellular Technology, Llc Device and method for controlling interference
DE102017116273A1 (de) * 2017-03-30 2018-10-04 Riedel Communications International GmbH Netzwerkgerät für ein Intercom-Netzwerk
US10931807B2 (en) 2017-03-30 2021-02-23 Riedel Communications International GmbH Device for intercom network

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Publication number Publication date
AU2003255883A1 (en) 2004-03-03
GB0219213D0 (en) 2002-09-25

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