WO1996002984A1 - Procede concernant un recepteur diversite - Google Patents

Procede concernant un recepteur diversite Download PDF

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Publication number
WO1996002984A1
WO1996002984A1 PCT/SE1995/000786 SE9500786W WO9602984A1 WO 1996002984 A1 WO1996002984 A1 WO 1996002984A1 SE 9500786 W SE9500786 W SE 9500786W WO 9602984 A1 WO9602984 A1 WO 9602984A1
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WO
WIPO (PCT)
Prior art keywords
receiver
antenna
message
reception quality
preamble
Prior art date
Application number
PCT/SE1995/000786
Other languages
English (en)
Inventor
Dag E:son ÅKERBERG
Original Assignee
Telefonaktiebolaget Lm Ericsson
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 Telefonaktiebolaget Lm Ericsson filed Critical Telefonaktiebolaget Lm Ericsson
Priority to AU29945/95A priority Critical patent/AU2994595A/en
Publication of WO1996002984A1 publication Critical patent/WO1996002984A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0805—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching
    • H04B7/0808—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception
    • H04B7/0811—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with single receiver and antenna switching comparing all antennas before reception during preamble or gap period
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • H04L7/046—Speed or phase control by synchronisation signals using special codes as synchronising signal using a dotting sequence

Definitions

  • the present invention relates to a method of selecting an antenna from two (or possibly more) antennas available in a diversity receiver.
  • This diversity receiver may form part of a transceiver unit in a mobile station intended for a DECT- type radio system, i.e. for a cordless person communication system of relatively short range, although with the possibil ⁇ ity of a mobile subscriber roaming over a large area.
  • the range between a base station and associated mobile stations is an essential criterion, particularly in systems of aforementioned kind, with regard to obtaining a cost- effective base station infrastructure and also with regard to obtaining a broad coverage radio system.
  • the power of a transmitted radio signal is typically inversely proportional to the fourth power of the distance between the transmitter and the receiver.
  • the area covered by the base station will be doubled with each 6 dB increase in receiver sensitivity, therewith enabling the number of base stations required to cover a large given area to be reduced by 50%.
  • the total cost of the system can also be greatly reduced, by improving receiver sensitivity.
  • sensitivity is meant here the minimum field strength at the receiver antenna which gives acceptable speech quality.
  • sensitivity the minimum field strength at the receiver antenna which gives acceptable speech quality.
  • the sensitivity limit is set to 1% burst error, i.e. only one burst in one-hundred may be in error (which is the same as saying that the so-called CRC error may be at most 1%) .
  • antenna diversity on the transmitter side or the receiver side will result in a marked improvement in sensi ⁇ tivity, with low cost in regard of typical fading environments in a radio system.
  • Antenna diversity involves separating two antennas in space or giving the two antennas different polarizations, so that a choice can be made between two radio paths, it being highly improbable that both paths will have a deep fading dip at one and the same time, i.e. that the signal strength will be low in both paths at one and the same time, because of fading.
  • Figure 10 in the aforesaid reference shows that the antenna diversity can result in a sensitivity increase of 10 dB (at 1% CRC error probability) .
  • the antenna path to be used is controlled by two different conditions. With one receiver for each of the two antennas, the control is per ⁇ formed after detection by comparing the quality of the two links for each burst, and data is selected from that link which had the best quality.
  • a less costly implementation is to have only one receiver together with a switch for the two antennas, wherein when the quality of a received burst is too poor, the receiver is switched to the other antenna for receiving the next burst.
  • the aforesaid decision time 10 ms in the case of the DECT system, is relatively long and the propagation conditions (fading, time dispersion) for a quickly moving mobile station are able to change during this period. It is, therefore, possible that the decision reached will be the wrong decision, meaning that detection of the actual information message will be made by the antenna which gives the poorer quality.
  • the present invention relates to a method of the kind defined in the introduction which combines the aforesaid cost- effectivemethod, according towhich only one receiver is used in diversity reception, with the aforesaid two-receiver principle, which provides reception properties that are independent of speed.
  • the inventive method is characterized by the method steps set forth in the following Claims.
  • Figure 1 is a block diagram illustrating a transmitter and a receiver with diversity in a radio communication system
  • Figure 2 is a diagram which illustrates frames and time slots and shows the configuration of messages transmitted in a TDMA system, with the intention of explaining the inventivemethod.
  • Figure 1 is a block diagram illustrating a transmitter S and a receiverM having diversity in a radio communication system, for instance in a DECT system in accordance with the afore- going.
  • the transmitter S may be included in the transmitter-receiver unit of a base station and is comprised of known components and circuits.
  • the transmitter sends radio signals in accor ⁇ dance with the TDMA principle, i.e. short bursts of control information and message information within given time slots in accordance with the following description.
  • Each signal time-divided in the transmitter S is comprised of a burst in a given time slot intended for a given receiver, and the bursts are transferred in a known manner, by suitable modula ⁇ tion and by means of a carrier wave having a given allotted frequency within the GHz range.
  • the receiver M is included in a mobile station which communi- cates with or which shall communicate with the base station.
  • the receiver has two antennas Al and A2, which, in the illustrated case, are connected to only one detector unit in the receiver M, by means of a switch SW.
  • the receiver detector is thus common to both of the antennas Al and A2.
  • the switch SW is controllable and is switched between its two positions by the detector unit in dependence on the quality of a burst from the radio signals sent by the transmitter S, this quality being determined by the detector unit.
  • the bit error rate BER of the detected bursts, the C/I ratio or some other known measurement may be used as a quality determining factor.
  • Figure 2 is a time diagram over frames la, lb, Ila, lib... and time slots S1...S12 within each frame that defines the so- called physical channels in a TDMA system, in this case particularly a DECT system.
  • Transmission and reception for both a base station and a mobile station are organized so that each alternate frame is a transmission frame and each other alternate frame is a reception frame.
  • Each frame contains a given number of time slots, in the DECT system 12 time slots SI...S12.
  • the time interval of a transmis- sion frame la and a reception frame lb is 10 ms.
  • a time slot e.g. S7
  • a time slot is about 0.4 ms (24 time slots in a 10 ms frame) .
  • the distance travelled by a subscriber during the 0.4 ms period must be short in comparison with the distance in space betweenthe fading dips.
  • the distance between the fading dips is about 8 cm at 1.9 GHz, and short relative distances are ⁇ 10%, i.e. ⁇ 8 mm.
  • the movement speed shall be maximum 20 m/s (72 kro/h) in order for the subscriber not to move further than 8 mm in the 0.4 ms period.
  • the antenna selection diversity is thus also effective in the case of vehicle-carried DECT.
  • Technology in which antenna selection diversity shall be effective at a walking speed (1 m/s) may therefore not receive on the same antenna for a period which is greater than 8 ms (20 x 0.4 ms).
  • the time slot during which the same antenna is used for receiving purposes must be shorter than 8 ms, otherwise the diversity will only provide a gain for stationary reception, (in which case the cheap standard diversity in DECT which provides no gain when the subscriber moves might just as well be used,
  • the transfer between the base station and the mobile takes place in time slot S7, wherein the mobile station will receive bursts from the base station in time slot S7 in each frame la, Ila... until reception has been terminated.
  • handover can take place when a new channel is chosen by or allocated to the mobile station, whereafter the transfer may be made in a time slot other than the earlier mentioned time slot S7.
  • Channel allocation in the DECT system is also dynamic, in other words the mobile station chooses from the total number of available channels that channel which is free at that moment in time and which has the lowest signal interference ratio C/I.
  • FIG. 2 shows a burst within a time slot S7.
  • the burst includes a preamble P which may have a length of 10 bits. This is followed by the actual information part D. This division of a message is generally known in the DECT system.
  • the message preamble P is used as a control message or as a synchronizing word for the receiver, and more particularly for its detector.
  • a synchronizing word may consist of alternate ones and zeros, for instance 01010101... (10 bits) .
  • the detector in the receiver M can synchronize itself to the following data message D.
  • the synchronizing word is divided into two parts PI and P2 so as to enable the detector in the receiver M to perform a quality measurement of the signals from each of the two antennas Al and A2 during a respective time interval PI and P2.
  • An interval Ql and Q2 between PI, P2 and between P2 and the data message D respec ⁇ tively are also reserved for switching of the switch SW between the two antennas Al, A2.
  • the switch when reception is started after channel allocation and activation in a known manner from the base station transmitter in response to the reception and detection of the synchronizing word, the switch will be positioned so that antenna Al is connected to the receiver detector, as illustrated in Figure 2.
  • the receiver detects the incoming synchronizing word, in the present case 01010101..., during the whole of the interval P, with the intention of ascertaining whether or not reception over the chosen channel is at all possible.
  • the inventive method is not a method of solely detecting a message by means of diversity, but a method of obtaining the best possible quality of a detected message when receiving with antenna diversity.
  • the receiver has detected the synchronizing word (01010101%) during the interval P by means of the antenna Al, even though a connected antenna A2 would have given a better detection result during precisely the synchronization part of the signal (frame la) .
  • the receiver detector has therewith detected the start time point of the preamble P in each burst.
  • the receiver is still connected to the antenna Al and the detector therewith detects and measures the reception quality of the synchronizing word received during the interval Pi.
  • the antenna A2 is connected to the receiver detector for similar detection of the synchroni ⁇ zing word, although this time during the interval P2.
  • a given small time interval Ql can be reserved during the interval P to enable switching of the antennas to be effected prior to said detection procedure and to ensure that the antennas will be switched at the correct instant with regard to the bit pattern of the synchronizing word.
  • the receiver detector detects and determines the reception qualityofthe synchronizingword received duringthe interval P2 in accordance with the same criterion as that used to determine the reception quality of the synchronizing word received during the interval PI. A comparison of the two measured qualities is then made during an interval Q2, which has been reserved for this purpose and for possible switching of the switch SW back to the antenna Al.
  • Antenna A2 is connected
  • the inventive method can also be applied with analog radio systems having antenna diversity if the system transfers messages thathave windows with short time intervals, where no traffic information is found.
  • a window can, therefore, be used in accordance with the method to contain the two part intervals PI and P2 in accordance with the aforegoing.

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

Abstract

La présente invention concerne un procédé de sélection d'antenne dans système de radiocommunications au standard DECT (Digital European Cordless Telephone). Dans ce système les stations mobiles fonctionnent en diversité d'antenne, c'est à dire avec 2 antennes (A1, A2) et sélectionnent celle des antennes qui procure la meilleure qualité de réception (par exemple, le taux d'erreurs binaires le plus bas). Le système radio émet les messages qui incorporent un préambule, c'est à dire une partie introductive (P) précédant les informations du message proprement dit (D). Ce préambule de message comporte une configuration binaire 01010101... et peut servir à synchroniser le récepteur de la station mobile. Selon le procédé proposé, la configuration binaire est divisée en 2 parties (P1 et P2). A la réception du message, la première partie (P1) sert à évaluer la qualité de réception d'une antenne, et la deuxième partie (P2) sert à vérifier la qualité de réception de l'autre antenne. Les mesures de qualité sont soumise à comparaison, et celle des antennes qui d'après la comparaison procure la meilleure qualité de réception est sélectionnée pour la réception du message d'information qui suit (D).
PCT/SE1995/000786 1994-07-15 1995-06-27 Procede concernant un recepteur diversite WO1996002984A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU29945/95A AU2994595A (en) 1994-07-15 1995-06-27 A method in a diversity receiver

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9402493-2 1994-07-15
SE9402493A SE9402493L (sv) 1994-07-15 1994-07-15 Metod i en diversitetsmottagare

Publications (1)

Publication Number Publication Date
WO1996002984A1 true WO1996002984A1 (fr) 1996-02-01

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PCT/SE1995/000786 WO1996002984A1 (fr) 1994-07-15 1995-06-27 Procede concernant un recepteur diversite

Country Status (3)

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AU (1) AU2994595A (fr)
SE (1) SE9402493L (fr)
WO (1) WO1996002984A1 (fr)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0808033A2 (fr) * 1996-05-14 1997-11-19 Matsushita Communication Industrial Co., Ltd. Récepteur de données avec diversité d'antennes
WO1998010531A1 (fr) * 1996-09-04 1998-03-12 Ascom Tech Ag Preambule a l'evaluation de la reponse impulsionnelle d'un canal dans un systeme a diversite d'antenne
WO1998028861A2 (fr) * 1996-12-10 1998-07-02 Nokia Telecommunications Oy Procede de diversite et equipement de station de base
EP0886388A2 (fr) * 1997-06-19 1998-12-23 Mitsubishi Denki Kabushiki Kaisha Emetteur, récepteur et contrÔle de la puissance dans un système de transmission de données
WO1999034534A1 (fr) * 1997-12-30 1999-07-08 Ericsson, Inc. Systeme unifie de commutation en diversite d'une antenne pour telephones bases sur l'amrt
WO1999034535A1 (fr) * 1997-12-30 1999-07-08 Ericsson, Inc. Systeme ameliore de commutation d'antenne en diversite pour telephones amrt
WO1999034533A1 (fr) * 1997-12-30 1999-07-08 Ericsson, Inc. Systeme perfectionne de selection d'antenne
WO1999038275A1 (fr) * 1998-01-23 1999-07-29 Telefonaktiebolaget Lm Ericsson Diversite de commutation d'antenne
NL1008198C2 (nl) * 1998-02-04 1999-08-05 Ericsson Telefon Ab L M Radio-ontvanginrichting met geschakelde diversiteit.
US5960046A (en) * 1996-12-03 1999-09-28 Northern Telecom Limited Preamble based selection diversity in a time division multiple access radio system
US6002672A (en) * 1996-10-25 1999-12-14 Nortel Networks Corporation Diversity antenna selection
US6032033A (en) * 1996-12-03 2000-02-29 Nortel Networks Corporation Preamble based selection diversity in a time division multiple access radio system using digital demodulation
DE19958118A1 (de) * 1999-12-02 2001-05-23 Infineon Technologies Ag Verfahren zum Auswählen einer Empfangsantenne und entsprechendes Übertragungssystem
DE19957595A1 (de) * 1999-11-30 2001-07-12 Fraunhofer Ges Forschung DECT-Sende/Empfangs-Endgerät und Verfahren zum Kommunizieren zwischen einem DECT-Sende/Empfangs-Endgerät und einer DECT-Basisstation
US6317424B1 (en) * 1994-06-21 2001-11-13 Siemens Aktiengesellschaft Antenna diversity radio receiving arrangement for telecommunications systems using block-oriented transmission of radio messages
WO2002052749A1 (fr) * 2000-12-22 2002-07-04 Telefonaktiebolaget L M Ericsson (Publ) Procede et dispositif de transmission de signaux dans des applications sans fil a l'aide d'une diversite d'antenne
WO2003049323A1 (fr) * 2001-12-06 2003-06-12 Thomson Licensing Sa Procede de selection d'un chemin de reception et dispositif de reception comprenant plusieurs chemins de reception
WO2003055101A1 (fr) * 2001-12-21 2003-07-03 Koninklijke Philips Electronics N.V. Commutation d'antennes reposant sur une metrique d'erreur quadratique moyenne de preambule
US6690927B1 (en) 1999-11-30 2004-02-10 Fraunhofer-Gessellschaft Zur Foerderung Der Angewandten Forschung E.V. DECT transmit-receive terminal and method for communicating between a DECT transmit-receive terminal and a DECT base station
US6694372B1 (en) 1997-06-17 2004-02-17 Advanced Micro Devices, Inc. Method and system for effective network communication of an unsupported media standard by encapsulated packet tagging
US6847628B1 (en) * 1999-06-10 2005-01-25 Nec Corporation High throughput TDMA/TDD diversity communication by assembling time slots into downlink burst groups corresponding to selected antennas
EP1548958A2 (fr) * 2003-12-26 2005-06-29 Kabushiki Kaisha Toshiba Dispositif et procédé de transmission et réception sans fil
EP1796358A2 (fr) * 2005-12-09 2007-06-13 Brother Kogyo Kabushiki Kaisha Dispositif de communication sans fil
FR2932627A1 (fr) * 2008-06-13 2009-12-18 Sagem Defense Securite Terminal mobile d'un systeme de communication par onde radiofrequence de type dect et procede de gestion des antennes de ce terminal
US7778223B2 (en) 2005-05-31 2010-08-17 Brother Kogyo Kabushiki Kaisha Cordless communication apparatus
WO2012048818A1 (fr) * 2010-10-14 2012-04-19 Daimler Ag Utilisation d'une liaison radioélectrique au moyen d'un appareil de radiocommunication mobile
US9923744B2 (en) 2004-03-12 2018-03-20 Kabushiki Kaisha Toshiba OFDM signal transmission method and apparatus

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WO1994008404A1 (fr) * 1992-09-25 1994-04-14 Northern Telecom Limited Systemes d'atennes multiples dans les communications privees par radio
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Cited By (62)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6317424B1 (en) * 1994-06-21 2001-11-13 Siemens Aktiengesellschaft Antenna diversity radio receiving arrangement for telecommunications systems using block-oriented transmission of radio messages
EP0808033A2 (fr) * 1996-05-14 1997-11-19 Matsushita Communication Industrial Co., Ltd. Récepteur de données avec diversité d'antennes
EP0808033A3 (fr) * 1996-05-14 2000-05-24 Matsushita Communication Industrial Co., Ltd. Récepteur de données avec diversité d'antennes
WO1998010531A1 (fr) * 1996-09-04 1998-03-12 Ascom Tech Ag Preambule a l'evaluation de la reponse impulsionnelle d'un canal dans un systeme a diversite d'antenne
US6118773A (en) * 1996-10-25 2000-09-12 Nortel Networks Corporation Impairment determination for a diversity antenna selection process
US6002672A (en) * 1996-10-25 1999-12-14 Nortel Networks Corporation Diversity antenna selection
US5960046A (en) * 1996-12-03 1999-09-28 Northern Telecom Limited Preamble based selection diversity in a time division multiple access radio system
US6032033A (en) * 1996-12-03 2000-02-29 Nortel Networks Corporation Preamble based selection diversity in a time division multiple access radio system using digital demodulation
WO1998028861A2 (fr) * 1996-12-10 1998-07-02 Nokia Telecommunications Oy Procede de diversite et equipement de station de base
WO1998028861A3 (fr) * 1996-12-10 1998-08-27 Nokia Telecommunications Oy Procede de diversite et equipement de station de base
US6694372B1 (en) 1997-06-17 2004-02-17 Advanced Micro Devices, Inc. Method and system for effective network communication of an unsupported media standard by encapsulated packet tagging
US6731910B2 (en) 1997-06-19 2004-05-04 Mitsubishi Denki Kabushiki Kaisha Data transmission system, data transmitter and data receiver used in the data transmission system
EP0886388A3 (fr) * 1997-06-19 2003-03-12 Mitsubishi Denki Kabushiki Kaisha Emetteur, récepteur et contrôle de la puissance dans un système de transmission de données
EP1995886A1 (fr) 1997-06-19 2008-11-26 Mitsubishi Denki Kabushiki Kaisha Récepteur de données utilisé dans un système de transmission de données
US7764930B2 (en) 1997-06-19 2010-07-27 Mitsubishi Denki Kabushiki Kaisha Data transmission system, data transmitter and data receiver used in the data transmission system
EP1689096A3 (fr) * 1997-06-19 2006-09-13 Mitsubishi Denki Kabushiki Kaisha Emetteur dans un système de transmission de données et procédé correspondant
EP1689096A2 (fr) * 1997-06-19 2006-08-09 Mitsubishi Denki Kabushiki Kaisha Emetteur dans un système de transmission de données et procédé correspondant
US7477878B2 (en) 1997-06-19 2009-01-13 Mitsubishi Denki Kabushiki Kaisha Data transmission system, data transmitter and data receiver used in the data transmission system
EP1455464A1 (fr) * 1997-06-19 2004-09-08 Mitsubishi Denki Kabushiki Kaisha Emetteur, récepteur et contrôle de la puissance dans un système de transmission de données
EP0886388A2 (fr) * 1997-06-19 1998-12-23 Mitsubishi Denki Kabushiki Kaisha Emetteur, récepteur et contrÔle de la puissance dans un système de transmission de données
US5952963A (en) * 1997-12-30 1999-09-14 Ericsson Inc. Advanced antenna diversity mechanism
WO1999034535A1 (fr) * 1997-12-30 1999-07-08 Ericsson, Inc. Systeme ameliore de commutation d'antenne en diversite pour telephones amrt
US6483884B1 (en) 1997-12-30 2002-11-19 Ericsson Inc. Antenna diversity switching system for TDMA-based telephones
WO1999034533A1 (fr) * 1997-12-30 1999-07-08 Ericsson, Inc. Systeme perfectionne de selection d'antenne
WO1999034534A1 (fr) * 1997-12-30 1999-07-08 Ericsson, Inc. Systeme unifie de commutation en diversite d'une antenne pour telephones bases sur l'amrt
US6553078B1 (en) 1998-01-23 2003-04-22 Telefonaktiebolaget Lm Ericsson (Publ) Antenna switching diversity
WO1999038275A1 (fr) * 1998-01-23 1999-07-29 Telefonaktiebolaget Lm Ericsson Diversite de commutation d'antenne
WO1999040690A1 (fr) * 1998-02-04 1999-08-12 Telefonaktiebolaget Lm Ericsson Appareil de reception radio a diversite par commutation
NL1008198C2 (nl) * 1998-02-04 1999-08-05 Ericsson Telefon Ab L M Radio-ontvanginrichting met geschakelde diversiteit.
US6847628B1 (en) * 1999-06-10 2005-01-25 Nec Corporation High throughput TDMA/TDD diversity communication by assembling time slots into downlink burst groups corresponding to selected antennas
DE19957595A1 (de) * 1999-11-30 2001-07-12 Fraunhofer Ges Forschung DECT-Sende/Empfangs-Endgerät und Verfahren zum Kommunizieren zwischen einem DECT-Sende/Empfangs-Endgerät und einer DECT-Basisstation
US6690927B1 (en) 1999-11-30 2004-02-10 Fraunhofer-Gessellschaft Zur Foerderung Der Angewandten Forschung E.V. DECT transmit-receive terminal and method for communicating between a DECT transmit-receive terminal and a DECT base station
DE19957595C2 (de) * 1999-11-30 2002-01-31 Fraunhofer Ges Forschung DECT-Sende/Empfangs-Endgerät und Verfahren zum Kommunizieren zwischen einem DECT-Sende/Empfangs-Endgerät und einer DECT-Basisstation
DE19958118A1 (de) * 1999-12-02 2001-05-23 Infineon Technologies Ag Verfahren zum Auswählen einer Empfangsantenne und entsprechendes Übertragungssystem
WO2002052749A1 (fr) * 2000-12-22 2002-07-04 Telefonaktiebolaget L M Ericsson (Publ) Procede et dispositif de transmission de signaux dans des applications sans fil a l'aide d'une diversite d'antenne
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SE9402493L (sv) 1996-01-16
SE9402493D0 (sv) 1994-07-15
AU2994595A (en) 1996-02-16

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