EP1245083A4 - Systeme dynamique a sauts de frequence - Google Patents

Systeme dynamique a sauts de frequence

Info

Publication number
EP1245083A4
EP1245083A4 EP01906518A EP01906518A EP1245083A4 EP 1245083 A4 EP1245083 A4 EP 1245083A4 EP 01906518 A EP01906518 A EP 01906518A EP 01906518 A EP01906518 A EP 01906518A EP 1245083 A4 EP1245083 A4 EP 1245083A4
Authority
EP
European Patent Office
Prior art keywords
bands
defined frequency
frequency band
control signal
wireless system
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP01906518A
Other languages
German (de)
English (en)
Other versions
EP1245083A1 (fr
Inventor
W Kurt Dobson
Dirk Ostermiller
Sy Prestwich
Todor Cooklev
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aware Inc
Original Assignee
Aware 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 Aware Inc filed Critical Aware Inc
Publication of EP1245083A1 publication Critical patent/EP1245083A1/fr
Publication of EP1245083A4 publication Critical patent/EP1245083A4/fr
Withdrawn legal-status Critical Current

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
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
    • 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
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • 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
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects
    • H04B2001/7154—Interference-related aspects with means for preventing interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff

Definitions

  • a frequency-hopping system in which the band for frequency hopping is dynamically changed in response to changing channel conditions or a command. Simultaneously with the change of the band of operation the output power may be changed as well, so that the system satisfies at all times the regulatory requirements of the country it operates in.
  • This invention relates generally to wireless communication systems utilizing frequency hopping.
  • a system where at least one transceiver searches for a set of usable frequencies and communicates this set to the other transceivers on the network, and employs frequency- hopping in this set of frequencies is disclosed in US Patent 5,214,788, assigned to Thomson-CSF of Puteaux, France, and incorporated here as a reference in its entirety.
  • a frequency-hopping communication method where the hopping frequencies change as a result of counted number of errors is disclosed in US Patent 5,541,954 assigned to Sanyo Electric Co., of Osaka, Japan, and incorporated here as a reference in its entirety. In this patent the errors on all the hopping frequencies are counted and, if the errors on a given frequency exceed a certain threshold, the frequency is not used.
  • US Patent 5,657,343, assigned to InterDigital Technology Corp., of Wilmington, DE discloses a system, where the system bandwidth B is divided into N non-overlapping sets of frequencies. Each of the base stations has a coverage area divided into a plurality of N concentric regions, with each concentric region assigned one of the N sets of frequencies.
  • WLAN wireless personal area network
  • WLAN devices installed in typical home and office spaces, etc., and is based on assumptions that the different systems are less likely to be used simultaneously. This does nothing to solve the coexistence problem, and is, furthermore, wrong in home networking applications, where all systems are likely to be used at the same time.
  • the 2.4 GHz ISM band is 83.5 MHz wide, between 2.4 and 2.4835GHz, everywhere except in Spain, France, and Japan. (Here we describe the operation in the USA and Europe, a substantially similar method of operation can be constructed for Spain, France and Japan).
  • Fig. 1 An illustration of frequency hopping
  • Fig. 1 illustrates the operation of frequency hopping systems.
  • time instant tl only a 1MHz- wide band around fl is used.
  • another 1 MHz- wide band is used, centered around another frequency.
  • the hopping is performed according to a pseudo-random sequence, known only to the transmitter and the intended receiver.
  • the hopping sequence is derived from the device address of the master of the connection.
  • the master of the connection is the device that temporarily controls the communication, all devices are physically the same and are able to assume the role of masters. Since the hopping sequence is not known to other receivers, hopping is considered secure.
  • the next channel is very likely to be good.
  • frequency hopping is that a signal, that needs only 1 MHz for transmission is spread over the entire 80 MHz-wide band. This is not only wasteful of bandwidth, but essentially does not allow the operation of other wireless systems in the same ISM band.
  • the operation of the system according to the first embodiment of the present invention is as follows.
  • the master of the connection monitors the signal-to-noise ratio in all channels. Then it finds a channel that has the highest signal-to-noise ratio and communicates this to the other devices. Further communication takes place on the selected channel without frequency hopping to other channels. Should the signal-to-noise ration on this cannel deteriorate gradually or suddenly to the point it can no longer be used for reliable communication, the frequency hopping within the entire band is restored by the master issuing a command to the slaves. Then, another attempt is made to find a single channel that can be reliably used for communication. In this system frequency hopping is used only during establishment of a connection, or when a change in the frequency channel needs to be implemented. At all other times frequency hopping is not performed.
  • the U-N ⁇ bands are governed in the U.S. by FCC Part 15.401 through 15.407 and the regulations are given in Table 2 and non-spread operation in these bands is also possible. Also, while here we are mainly concerned with regulations in the United States, similar regulations exist in the other countries. Thus the applicability of the present invention is not limited to the United States, and the implementation of a system according to this embodiment would be substantially similar everywhere in the world.
  • the first embodiment of the present invention has a number of advantages.
  • the other channels can be used by other wireless systems, which may or may not be frequency-hopping.
  • some of the other wireless systems can be high-rate orthogonal frequency-division multiplexing (OFDM) systems.
  • OFDM orthogonal frequency-division multiplexing
  • the proposed here solution is the simplest and most economical way to achieve coexistence among wireless communication systems. While sophisticated error-correcting coding and equalization may improve the performance of all wireless systems, even when they face the "big stick” policy, the complexity and cost would be significant and perhaps prohibitive in high-volume applications.
  • the proposed here implementation replaces the "big stick" policy with the "good citizen” policy.
  • the devices can hop in a narrower band.
  • the invention can be implemented by restricting the value of the integer K to a closed subset of the set ⁇ 0, ..., 78 ⁇ .
  • the rest of the band is made available for other wireless systems. This also achieves the objectives of the present invention, and - since frequency hopping continues to be employed albeit in a narrower band - the devices can transmit typically at a higher power than non-spread devices, according to the appropriate regulations.
  • a wireless transceiver e. g. the master of the connection will determine which subband of the entire band- to use, on the basis of the vacant portion of the spectrum. For example, if there is another wireless system in operation in the same band, which is also a "good citizen", most of the channels will offer a high signal-to-noise ratio. The transceiver can select those that offer the highest signal-to-noise ratio. Another instance of the second embodiment is where the transceiver selects a number of channels, depending on the requirements for the particular application. Thus a higher data rate can be obtained.
  • the operation of the wireless system according to this second embodiment is dynamic, and if the conditions on the selected channels deteriorate, e. g.
  • the system returns to hopping in the entire band, and selects another set of good channels.
  • the system may select a new set of channels without returning to hopping in the entire band. This can happen, for example, if conditions have deteriorated on only some of the channels, such that other channels still offer acceptable signal-to-noise ratio.
  • the master of the connection can communicate the new set of channels to the other transceivers using only the available good channels.
  • Another part of the second embodiment is that when there is a change in the number of channels used power may be adjusted to levels allowed by the appropriate regulatory agencies, if necessary.
  • One implementation of the second embodiment can be easily devised in the important special case of Bluetooth. This standard supports different number of hop frequencies according to the

Landscapes

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

Abstract

L'invention concerne un système à sauts de fréquence, dans lequel la largeur de bande de saut de fréquence est modifiée en réponse à une modification de conditions de canal ou de commande. On peut également modifier la puissance de sortie en même temps que la bande de fonctionnement, de sorte que ledit système satisfait à tout moment aux exigences de régularité du pays dans lequel il fonctionne.
EP01906518A 2000-01-08 2001-01-08 Systeme dynamique a sauts de frequence Withdrawn EP1245083A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US17544900P 2000-01-08 2000-01-08
US175449P 2000-01-08
PCT/US2001/000501 WO2001052436A1 (fr) 2000-01-08 2001-01-08 Systeme dynamique a sauts de frequence

Publications (2)

Publication Number Publication Date
EP1245083A1 EP1245083A1 (fr) 2002-10-02
EP1245083A4 true EP1245083A4 (fr) 2003-06-04

Family

ID=22640252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01906518A Withdrawn EP1245083A4 (fr) 2000-01-08 2001-01-08 Systeme dynamique a sauts de frequence

Country Status (6)

Country Link
EP (1) EP1245083A4 (fr)
JP (1) JP2003520488A (fr)
KR (1) KR20020063299A (fr)
AU (1) AU3441701A (fr)
CA (1) CA2394751A1 (fr)
WO (1) WO2001052436A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7474677B2 (en) 2003-08-12 2009-01-06 Bose Corporation Wireless communicating
US8442019B2 (en) 2003-08-12 2013-05-14 Bose Corporation Method and apparatus for avoiding wireless audio signal transmission interferences
CN101204100B (zh) 2005-06-15 2011-01-05 华为技术有限公司 通信资源分配方法和系统
US8243773B2 (en) * 2006-05-26 2012-08-14 Itron, Inc. Clear-channel system and related applications
US10013381B2 (en) 2006-08-31 2018-07-03 Bose Corporation Media playing from a docked handheld media device
US10089702B2 (en) 2014-01-17 2018-10-02 Airbnb, Inc. Location based ranking of real world locations

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377221A (en) * 1984-05-12 1994-12-27 Racal Research Limited Communications system
US5528623A (en) * 1994-10-26 1996-06-18 American Wireless Corporation Cordless telephone system having automatic control of transmitter power and frequency in response to changing conditions
US5668828A (en) * 1992-05-08 1997-09-16 Sanconix, Inc. Enhanced frequency agile radio

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287384A (en) * 1992-10-15 1994-02-15 Lxe Inc. Frequency hopping spread spectrum data communications system
US5459759A (en) * 1993-02-17 1995-10-17 Interdigital Technology Corporation Frequency hopping code division multiple access system and method
US5335249A (en) * 1993-07-29 1994-08-02 Seattle Silicon Corporation Method and apparatus for spread spectrum communications
US5459760A (en) * 1993-11-05 1995-10-17 Matsushita Electric Industrial Co., Ltd. Transmitting and receiving apparatus
US5579306A (en) * 1994-09-01 1996-11-26 Ericsson Inc. Time and frequency slot allocation system and method
JP3284074B2 (ja) * 1996-03-25 2002-05-20 キヤノン株式会社 無線通信システム及びその制御方法、無線通信装置及びその制御方法
JPH10271037A (ja) * 1997-03-19 1998-10-09 Fujitsu General Ltd スペクトラム拡散無線通信装置
JPH10271041A (ja) * 1997-03-24 1998-10-09 Brother Ind Ltd 無線通信装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377221A (en) * 1984-05-12 1994-12-27 Racal Research Limited Communications system
US5668828A (en) * 1992-05-08 1997-09-16 Sanconix, Inc. Enhanced frequency agile radio
US5528623A (en) * 1994-10-26 1996-06-18 American Wireless Corporation Cordless telephone system having automatic control of transmitter power and frequency in response to changing conditions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO0152436A1 *

Also Published As

Publication number Publication date
KR20020063299A (ko) 2002-08-01
JP2003520488A (ja) 2003-07-02
EP1245083A1 (fr) 2002-10-02
AU3441701A (en) 2001-07-24
WO2001052436A9 (fr) 2002-07-18
WO2001052436A1 (fr) 2001-07-19
CA2394751A1 (fr) 2001-07-19

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