WO2001091334A1 - Appareil reduisant dans des systemes de radiocommunication les effets d'evanouissement rapide des signaux radio propages pour postes stationnaires, et mobiles a deplacements lents - Google Patents

Appareil reduisant dans des systemes de radiocommunication les effets d'evanouissement rapide des signaux radio propages pour postes stationnaires, et mobiles a deplacements lents Download PDF

Info

Publication number
WO2001091334A1
WO2001091334A1 PCT/US2000/014165 US0014165W WO0191334A1 WO 2001091334 A1 WO2001091334 A1 WO 2001091334A1 US 0014165 W US0014165 W US 0014165W WO 0191334 A1 WO0191334 A1 WO 0191334A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency
carrier frequency
carrier
signal
create
Prior art date
Application number
PCT/US2000/014165
Other languages
English (en)
Inventor
Graeme White
Stefan Scheinert
Original Assignee
Littlefeet, Inc.
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 Littlefeet, Inc. filed Critical Littlefeet, Inc.
Priority to PCT/US2000/014165 priority Critical patent/WO2001091334A1/fr
Priority to AU2000251564A priority patent/AU2000251564A1/en
Priority to PCT/US2000/030531 priority patent/WO2001091336A1/fr
Priority to AU2001213620A priority patent/AU2001213620A1/en
Priority to PCT/US2000/030530 priority patent/WO2001091335A1/fr
Priority to AU2001214681A priority patent/AU2001214681A1/en
Publication of WO2001091334A1 publication Critical patent/WO2001091334A1/fr

Links

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
    • H04B7/12—Frequency diversity

Definitions

  • SAD employs two antennas coupled to a single receiver through a single pole, double throw radio frequency (RF) switch.
  • a controller samples the signal received from each antenna to couple only one of the two antennas to the receiver at a time.
  • a multi-stage phase modulation is provided as modulation in a preferred embodiment of the invention (U.S. Patent No. 5,708,973).
  • a Gray encoding can be used.
  • the individual, transmitted words are transmitted as a specific phase value or a differential coding is performed.
  • For transmitting a symbol one first waits for the transient response of the channel to end before the actual evaluation begins. The amplitude and phase of the signal no longer significantly change during this evaluation.
  • a transmission with respect to amplitude for the base station and a controlled phase or amplitude transmission before the waiting time for the transient response of the channel for the mobile stations can be used.
  • Certain further embodiments include the time slices being significantly shorter than the time slots in duration, so that more than one carrier frequency modification occurs within one time slot. Such embodiments in certain circumstances add to the removal of rayleigh fast fading zones, by shifting them more than once within the time slot. Also, since rayleigh fading is a predominantly multipath phenomena, changes in the carrier frequency offset will cause additional movement of the fast fading zones, when paths with differing phase overlap in what had been the fast fading zone.
  • Certain further embodiments include determining the carrier offset frequency further comprising determining a signal quality support condition; and determining the carrier offset frequency whenever the signal quality support condition occurs. Such embodiments advantageously support determining the signal quality support condition and determining the carrier offset frequency whenever the signal quality support condition occurs.
  • Certain further embodiments include a filter receiving the first modified carrier mixed signal to create a filtered first modified carrier mixed signal presented as the second raw frequency input signal to the second carrier frequency presentation mechanism. Such embodiments advantageously support filtering the first modified carrier mixed signal as the second raw frequency input signal presented to the second carrier frequency presentation mechanism.
  • Figure 16B depicts a detail flowchart of operation 2004 of Figure 10A further performing modifying the carrier frequency of at least one carrier frequency of the carrier frequency collection in accordance with certain embodiments.
  • Figure 17B depicts a detail flowchart of operation 2312 of Figure 17A further performing local controller modifying the carrier frequency in accordance with certain embodiments.
  • Figure 19A depicts the raw frequency input signal 3110 generated 3302 from the electromagnetic conditions of first antenna 3300, in accordance with certain embodiments.
  • Raw frequency input signal 3110 and carrier frequency signal 3214 are presented to first mixer 3210 to create first mixed signal 3212.
  • Carrier offset frequency generator 3220 is controllably coupled 3102 to said local computer 3000 of Figure 18A to create a carrier offset frequency signal 3222.
  • First mixed signal 3212 and carrier offset frequency signal 3222 are presented to second mixer 3230 to create modified carrier mixed signal 3120.
  • frequency synthesizer 3260 includes a Phase Locked Loop (PLL) controllably coupled to local computer 3000 of Figure 18A. In certain further embodiments, frequency synthesizer 3260 includes a Phase Locked Loop (PLL) containing a voltage controlled oscillator and parallel coupled pre-scaler controllably coupled to local computer 3000 of Figure 18 A. In certain further embodiments, mixer 3210 may act to frequency modulate the presented signals to produce their created signal. In certain other further embodiments, mixer 3210 may act to phase modulate the presented signals to produce their created signal. In certain other further embodiments, mixer 3210 may act to amplitude modulate the presented signals to produce their created signal.
  • PLL Phase Locked Loop
  • first carrier frequency presentation mechanism 3200 accepts first raw frequency input signal 3110 and presents first modified carrier mixed signal 3120.
  • first modified carrier mixed signal 3120 is presented within communications radio transceiver 3100.
  • carrier frequency presentation mechanism 3200 accepts first raw frequency input signal 3110 and presents first modified carrier mixed signal 3120.
  • Carrier frequency presentation mechanism 3200 accepts second raw frequency input signal 3112 and presents second modified carrier mixed signal 3122.
  • Figure 33 depicts carrier frequency presentation mechanism 3200 as shown in Figure 22 further comprising carrier frequency 3214 and raw frequency input signal 3112 presented to third mixer 3280 creating third mixed signal 3282 and carrier offset frequency signal 3222 presented to fourth mixer 3284 to create modified carrier mixed signal 3122, in accordance with certain embodiments.
  • Figure 34 depicts carrier frequency presentation mechanism 3200 as shown in Figure 24A further comprised modified carrier frequency signal 3244 mixed 3280 with second raw frequency input signal 3112 to create second modified carrier mixed signal 3122, in accordance with certain embodiments.
  • local oscillator 3242 is controllably coupled 3102 to local computer 300 of Figure 18A to create modified carrier frequency signal 3244.
  • Raw frequency input signal 3110 and modified carrier frequency signal 3244 are presented to mixer 3210 to create modified carrier mixed signal 3120.
  • Figure 35 depicts carrier frequency presentation mechanism 3200 as shown in Figure 23 further comprised of carrier offset generator 3270 creating carrier offset signal 3272 and carrier frequency signal 3244 presented to carrier modification circuit 3254 creating modified carrier frequency signal 3256 presented with raw frequency input signal 3112 to mixer 3280 to create modified carrier mixed signal 3122, in accordance with certain embodiments.
  • one or both carrier modification circuits include a frequency synthesizer. In certain further embodiments, one or both carrier modification circuits include a frequency synthesizer creating a frequency modulated carrier offset signal. In certain further embodiments, one or both carrier modification circuits include a frequency synthesizer creating a phase modulated carrier offset signal. In certain further embodiments, one or both carrier modification circuits include a frequency synthesizer creating an amplitude modulated carrier offset signal.
  • Figure 37 depicts carrier frequency presentation mechanism 3200 as shown in Figure 36 further comprised of local oscillator 3242 generating reference frequency signal 3248 presented to frequency synthesizer 3294 generating modified carrier frequency signal 3296 presented with raw input frequency signal to mixer 3280 generating modified carrier mixed signal 3122, in accordance with certain embodiments.
  • Local oscillator 3242 generates two reference frequency signals 3236 and 3248. In certain further embodiments, local oscillator 3242 generates more than two reference frequency signals.

Abstract

L'invention porte sur des procédés d'utilisation d'un appareil et d'utilisation et d'exploitation d'un émetteur/récepteur radio présentant au moins une fréquence de porteuse et des tolérances de fréquence associées. Lesdits procédés consistent à modifier la fréquence de la porteuse en restant à peu près dans les tolérances associées pour créer une nouvelle fréquence. Les modules de modification de la fréquence de la porteuse comportent à la fois des mécanismes de commande numériques et non numériques.
PCT/US2000/014165 2000-05-23 2000-05-23 Appareil reduisant dans des systemes de radiocommunication les effets d'evanouissement rapide des signaux radio propages pour postes stationnaires, et mobiles a deplacements lents WO2001091334A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
PCT/US2000/014165 WO2001091334A1 (fr) 2000-05-23 2000-05-23 Appareil reduisant dans des systemes de radiocommunication les effets d'evanouissement rapide des signaux radio propages pour postes stationnaires, et mobiles a deplacements lents
AU2000251564A AU2000251564A1 (en) 2000-05-23 2000-05-23 Apparatus for reducing fast fading radio propagation effects for stationary and slow moving mobiles in radio communication systems
PCT/US2000/030531 WO2001091336A1 (fr) 2000-05-23 2000-11-04 Attenuation des effets d'evanouissement rapide dans des systemes de communication
AU2001213620A AU2001213620A1 (en) 2000-05-23 2000-11-04 System for reducing fast fading effects in radio communications systems
PCT/US2000/030530 WO2001091335A1 (fr) 2000-05-23 2000-11-04 Attenuation des effets de propagation d'evanouissement rapide dans des systemes de communication radio
AU2001214681A AU2001214681A1 (en) 2000-05-23 2000-11-04 Methods of reducing fast fading effects in radio communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/014165 WO2001091334A1 (fr) 2000-05-23 2000-05-23 Appareil reduisant dans des systemes de radiocommunication les effets d'evanouissement rapide des signaux radio propages pour postes stationnaires, et mobiles a deplacements lents

Publications (1)

Publication Number Publication Date
WO2001091334A1 true WO2001091334A1 (fr) 2001-11-29

Family

ID=21741414

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/014165 WO2001091334A1 (fr) 2000-05-23 2000-05-23 Appareil reduisant dans des systemes de radiocommunication les effets d'evanouissement rapide des signaux radio propages pour postes stationnaires, et mobiles a deplacements lents

Country Status (2)

Country Link
AU (1) AU2000251564A1 (fr)
WO (1) WO2001091334A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2842650A1 (de) * 1978-09-29 1980-04-10 Siemens Ag Schaltungsanordnung zur erzeugung und uebertragung von sinusschwingungen unterschiedlicher frequenz
US5283780A (en) * 1990-10-18 1994-02-01 Stanford Telecommunications, Inc. Digital audio broadcasting system
EP0801473A2 (fr) * 1996-04-10 1997-10-15 Lucent Technologies Inc. Procédés et dispositifs de transmission à haut débit pour des canaux radio-mobile à bande étroite
DE19621199A1 (de) * 1996-05-25 1997-11-27 Bosch Gmbh Robert Verfahren und Verringerung von Schwund
WO1999023772A1 (fr) * 1997-11-04 1999-05-14 Motorola Inc. Procede et appareil servant a reduire l'effet d'une condition d'evanouissement dans un systeme de communication
EP0942538A2 (fr) * 1998-03-10 1999-09-15 Matsushita Electric Industrial Co., Ltd. Dispositif et procédé de transmission et réception utilisant le balayage en fréquence

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2842650A1 (de) * 1978-09-29 1980-04-10 Siemens Ag Schaltungsanordnung zur erzeugung und uebertragung von sinusschwingungen unterschiedlicher frequenz
US5283780A (en) * 1990-10-18 1994-02-01 Stanford Telecommunications, Inc. Digital audio broadcasting system
EP0801473A2 (fr) * 1996-04-10 1997-10-15 Lucent Technologies Inc. Procédés et dispositifs de transmission à haut débit pour des canaux radio-mobile à bande étroite
DE19621199A1 (de) * 1996-05-25 1997-11-27 Bosch Gmbh Robert Verfahren und Verringerung von Schwund
WO1999023772A1 (fr) * 1997-11-04 1999-05-14 Motorola Inc. Procede et appareil servant a reduire l'effet d'une condition d'evanouissement dans un systeme de communication
EP0942538A2 (fr) * 1998-03-10 1999-09-15 Matsushita Electric Industrial Co., Ltd. Dispositif et procédé de transmission et réception utilisant le balayage en fréquence

Also Published As

Publication number Publication date
AU2000251564A1 (en) 2001-12-03

Similar Documents

Publication Publication Date Title
KR100211475B1 (ko) 무선 가입자 유니트 및 그 작동 방법
KR100211474B1 (ko) 무선 가입자 유니트에서 다이버시티 수신기 장치를 제어하기 위한 방법
KR100211476B1 (ko) 다이버시티 수신기 장치를 갖는 이중 모드 무선 가입자 유니트 및 그 작동 방법
KR100354994B1 (ko) 데이터확장파일럿심벌지원형무선전화통신용시스템및방법
US7564910B2 (en) Method and system for communications with reduced complexity receivers
EP2421172B1 (fr) Architecture sans fil distribuée faisant appel à la micro-diffusion
US7072325B1 (en) Cellular system
KR100883625B1 (ko) 상관 및 비상관 안테나 소자들의 조합을 사용하는 암묵신호 분리
WO1997024818A1 (fr) Procede et appareil pour installer une diversite d'antennes dans un radiotelephone portable
JPH08307333A (ja) 送信ダイバシティ方式
KR100311236B1 (ko) 송신기및수신기
RU2177207C2 (ru) Приемник мобильной системы связи и способ приема в мобильной системе связи
KR100848846B1 (ko) 어레이 편향을 사용하는 암묵 신호 분리
EP1044516B1 (fr) Emetteur a mode tstd limitant la puissance de transmission d'une antenne et procede de controle associe pour une station de base dans un systeme de communications mobiles
US8761282B2 (en) Receiver and receiving method
JPH09505953A (ja) Ｃｄｍａセルラー無線システムにおいて拡散比を調整することにより信号の質を高める方法
US6704345B1 (en) Transmission/reception apparatus and transmission/reception method
Lawrey et al. Adaptive frequency hopping for multiuser OFDM
WO2001091334A1 (fr) Appareil reduisant dans des systemes de radiocommunication les effets d'evanouissement rapide des signaux radio propages pour postes stationnaires, et mobiles a deplacements lents
WO2001091333A1 (fr) Appareil reduisant dans des systemes de radiocommunication les effets d'evanouissement rapide des signaux radio propages pour postes stationnaires, et mobiles a deplacements lents
JPH09261172A (ja) 移動通信装置
JP2000353998A (ja) ダイバーシティ受信機およびダイバーシティ送信機
JPH07245577A (ja) ダイバーシチ通信装置
JP4964373B2 (ja) キャリア周波数割り当て方法
Kunihiro et al. BDMA testbed-configuration and performance results

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZA ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP