WO1996038925A1 - Module emetteur-recepteur a spectre etale faisant intervenir la transmission en mode multiple - Google Patents

Module emetteur-recepteur a spectre etale faisant intervenir la transmission en mode multiple Download PDF

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Publication number
WO1996038925A1
WO1996038925A1 PCT/US1996/009474 US9609474W WO9638925A1 WO 1996038925 A1 WO1996038925 A1 WO 1996038925A1 US 9609474 W US9609474 W US 9609474W WO 9638925 A1 WO9638925 A1 WO 9638925A1
Authority
WO
WIPO (PCT)
Prior art keywords
communication
data
radio
transceiver
wireless
Prior art date
Application number
PCT/US1996/009474
Other languages
English (en)
Inventor
Ronald L. Mahany
Original Assignee
Norand Corporation
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
Priority claimed from US08/513,658 external-priority patent/US6714983B1/en
Priority to US08/973,195 priority Critical patent/US6697415B1/en
Priority to AU64762/96A priority patent/AU6476296A/en
Application filed by Norand Corporation filed Critical Norand Corporation
Publication of WO1996038925A1 publication Critical patent/WO1996038925A1/fr
Priority to US09/357,429 priority patent/US6665536B1/en
Priority to US10/648,707 priority patent/US7107052B2/en
Priority to US10/648,726 priority patent/US7013138B2/en
Priority to US10/684,650 priority patent/US7676198B2/en
Priority to US10/765,451 priority patent/US20050048963A1/en
Priority to US11/288,024 priority patent/US20060182074A1/en
Priority to US11/496,950 priority patent/US7710907B2/en
Priority to US11/497,499 priority patent/US7710935B2/en
Priority to US12/720,231 priority patent/US20100158077A1/en

Links

Classifications

    • 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
    • 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
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0032—Without explicit signalling

Definitions

  • the present invention relates generally to communication networks utilizing spread
  • the spread spectrum modes include, for example, direct
  • units within a wireless local area network include stationary wireless access devices, mobile
  • radio units mobile image capture units, printing units, and other units operative with the data
  • local area networks typically employ cellular communication techniques to provide the
  • wireless communication links within the local are network within the local are network.
  • the wireless local are network provides traditional network functions as
  • Spread spectrum transmission techniques include direct sequence transmission,
  • frequency hopping transmission a combination of direct sequence transmission and frequency
  • hopping transmission may include other techniques that deliberately transmit over a wide
  • Direct sequence spread spectrum transmitters typically spread by first modulating a
  • the composite modulation is coupled to a carrier via modulation
  • Phase modulation is typically employed, but frequency
  • Circuitry in a receiving units may also be used.
  • the pseudo random chipping sequence applied by the receiving unit corresponds to all, or
  • the receiving unit receives only
  • signal is therefore a composite that may be averaged or weighted to avoid receiving improper
  • a frequency hopping system commonly uses conventional narrowband modulation but
  • the spreading bandwidth within which transmission is difficult may be substantially avoided.
  • Process gain is a measure of the ability of a spread spectrum system to resist
  • Wide bandwidth modulation is reasonably resistant to low or
  • communications can be established in a portion of the band where interference is not present.
  • hopping is also useful as a multiple access technique. Use of multiple hopping sequences
  • Frequency hopping also provides similar multipath rejection capabilities to wideband
  • Frequency hopping systems require more protocol overhead to aid in establishing and
  • the initial acquisition of the hopping sequence may require that an unsynchronized device scan the band for a period equivalent to may hop times.
  • short hop communications such as communications between a portable hand-held device
  • OFF-Keying may be desirable.
  • radio transceivers used
  • the network may fail to meet the
  • a design might be based on a customer's needs for a small store in a
  • the customer requires a radio which is free from interference from nearby
  • each of the radios would be optimized
  • a client may have diverse operational
  • the particular applications of the radio unit may change several
  • the site may also have areas which are relatively noise and barrier
  • transceiver design can never provide optimal performance in all areas. Sacrifices are made in
  • a worker may require mobile communications to a
  • each wireless local area network may have been designed
  • transceiver unit capabilities and applications to be performed in such dynamic optimization.
  • modulation techniques providing multiple configurable modes of data transmission, whereby
  • modes may be selected to attain optimal transmission performance.
  • a further object of the present invention is to provide an RF data transceiver module
  • transceiver utilizing 900 MHz transmission and having a standard interface with common 2.4
  • Another object of the present invention is to produce a wireless local area network
  • a further object of the present invention is to provide a wireless RF transceiver module
  • modem may dynamically change modes of operation transparently to the host device, not
  • Yet another object of the present invention is to produce a modular wireless LAN
  • modem that may be utilized for both in-premise and worker to vehicle application, and for
  • a selected spread spectrum mode, or set of spread spectrum modes, is based
  • One particular operating environment relates to multi-hop wireless networks that are
  • transmitter devices of the network may have different operating capabilities.
  • the system and radio of the present invention provide a mechanism for selecting
  • the network for collecting and communicating data is disclosed.
  • the network is disclosed.
  • the wireless access device comprises a wireless access device and at least one mobile terminal.
  • the wireless access device comprises a wireless access device and at least one mobile terminal.
  • a control circuit and a first RF transceiver that selectively operates in one of a
  • the at least one mobile terminal comprises a second RF
  • transceiver that operates in at least one of a plurality of spread spectrum modes.
  • circuit responds to transmissions received from the first RF transceiver to evaluate
  • the plurality of spread spectrum modes of the first RF transceiver may
  • the control circuitry may evaluate
  • capable of communicating with a plurality of radios comprises a radio capable of operating in a
  • the wireless access device also comprises a spread
  • spectrum mode controller responsive to transmissions and data received for evaluating the data
  • the wireless access device may further comprise circuitry for evaluating the plurality of
  • spread spectrum modes to select a spread spectrum mode of operation. Such selection may
  • an RF transceiver comprises an modulator having a spreader, a demodulator having a
  • despreader a controllable oscillator attached to the modulator and demodulator, and control
  • circuitry that both selectively enables the spreader and despreader and selectively controls the
  • controllable oscillator to cause operation in one of a plurality of modes of spread spectrum
  • the data communication system may further comprising a host controller that directs
  • control circuitry in the selection of the one of the plurality of modes of spread spectrum
  • the host controller may comprise wireless access device control circuitry.
  • control circuitry may wirelessly receive instruction regarding selection of the one
  • FIG. 1 A is a perspective view of a wireless communication network built in accordance
  • FIG. IB is a flow diagram illustrating the operation of a wireless access device in
  • FIG. 1 C is a block diagram illustrating a radio transceiver built in accordance with the
  • present invention to provide multiple modes of operation
  • FIG. ID is a block diagram illustrating the operation of the wireless access device
  • FIG. 2A is a front elevation view of one embodiment of a hand-held portable data
  • FIG. 2B is a side elevation view of the hand-held portable data terminal of FIG. 2A
  • FIG. 3 is a side evaluation view of the hand-held portable data terminal of FIG. 2A
  • FIG. 4 is a side elevation view of the hand -held portable data terminal of FIG. 2A
  • FIGS. 4A, 4B and 4C illustrate in detail the cooperation between a radio module and
  • FIG. 5 is a perspective view of another hand-held portable data terminal which may
  • FIG. 6 is a side elevation view of the data terminal of FIG. 5 showing an extendibly
  • retractable rotating carriage housing for receiving a module incorporating the present
  • FIG. 7 is an exploded view of a radio module incorporating the present invention.
  • FIG. 8 is an exploded view of a radio module of the present invention.
  • FIG. 9 is an exploded view of a radio module of the present invention contained within
  • FIG. 10 is a functional block diagram of the architecture of the radio modules of the
  • FIG. 11 is a conceptual block diagram of the operation of the transmitter of FIG. 10
  • FIG. 12 shows a conceptual diagram of the operation of the receiver utilized in
  • FIG. 13 is a block diagram of an embodiment of a receiver of the present invention.
  • FIG. 14A is a diagram of the pseudo-random number generator shown in FIG.10;
  • FIG. 14B is a schematic block diagram illustrating the interaction of the pseudo-random
  • FIG. 15 is a block diagram illustrating the frequency generator circuitry as shown in
  • FIG. 10 is a diagrammatic representation of FIG. 10
  • FIG. 16 is a block diagram illustrating the transmitter circuitry as shown in FIG. 10;
  • FIG. 17 illustrates the circuitry for selecting between the modes of modulation of the
  • FIG. 18 is a block diagram of the MAC circuitry as shown in FIG. 10;
  • FIG. 19 is a block diagram illustrating the host interface circuitry as shown in FIG. 10
  • FIG. 20 is a block diagram illustrating the host interface circuitry as shown in FIG. 10
  • FIG. 21 is a diagram illustrating an alternate configuration of portable data terminals
  • FIG. 22A illustrates one embodiment of the data collection terminal of the present
  • FIG. 22B is a diagram illustrating a specific implementation of the portable terminal of
  • FIG. 22A a single PCMCIA card contains not only a multi-mode wireless transceiver, but also a
  • FIG. 23 is a diagram illustrating the use of portable terminals according to the present
  • FIG. 24 is a diagram illustrating the use of portable data terminals according to the
  • FIG. 25a is a block diagram illustrating an embodiment of the present invention wherein a
  • wireless access device uses a dedicated control / busy channel to manage a plurality of modes of
  • FIG. 25b is a drawing illustrating advantageous operation of the wireless access device of
  • FIG. 25a when two roaming terminals encounter hidden terminal conditions.
  • FIG. 25c is a flow diagram illustrating the functionality of the wireless access device of
  • FIGS. 25a-b in managing communication using a control / busy channel.
  • FIG. 26a is a block diagram illustrating an alternate embodiment of that shown in FIG.
  • channel and a roaming terminal uses either a shared multimode transmitter or a multimode
  • FIG. 26b is a drawing illustrating advantageous operation of the wireless access device of
  • FIG. 26a when the two roaming terminals encounter hidden terminal conditions.
  • FIG. 26c is a flow diagram illustrating the functionality of the wireless access device of
  • FIGS. 26a-b in managing communication using a control / busy channel.
  • FIG. 27 is a block diagram illustrating a further embodiment of the present invention.
  • channel selection and operating parameters are delivered by a wireless access device on a
  • FIG. IA illustrates a communication network 1 incorporating the teachings of the
  • the system comprises wireless access devices 2A, 2B and 2C, portable
  • transceiver units 4A, 4B and 4C a wireless code reader 5 and a peripheral device 6.
  • wireless access devices 2A and 2B communicate directly on a wired network 3 to each other
  • the wireless access device 2C communicates
  • the wireless access device 2B The wireless access device 2B.
  • the wireless access 2A-C may comprise wireless access points or wireless access
  • the devices 2A-C has associated with it a range or cell of communication.
  • the range or cell of communication For example, the
  • portable transceiver units 4A-C may wander in and out of range of the wireless access device
  • Cell areas typically
  • unit may communicate with at least two wireless access devices. To avoid conflicts with
  • the present invention provides several techniques for accommodating
  • wireless access devices 2A-C, peripheral device 6 and code reader 5 may
  • the present invention provides a
  • a wireless access device may dynamically
  • wireless access device engages in such consideration when initially establishing
  • received signal strength alone may be used as a mode performance
  • transmissions might also or alternately require a mode having a wider spreading bandwidth or
  • a spread spectrum mode may be
  • a direct sequence spreading mode may be employed that provides greater
  • the wireless access devices 2A-C also support changes
  • radio transceiver may be able to participate with newer transceivers that may support newer
  • the network 1 would attempt to accommodate such communication in a
  • received by a receiver is a composite of all signals that have reached that receiver by taking all
  • the received signal is therefore often referred to as a
  • composite signal which has a power envelope equal to the vector sum of the individual
  • receivers in a mobile RF environment, receivers (or the corresponding transmitters) often travel over
  • the signal components that determine the composite signal are
  • correlation distance wherein a high degree of correlation exists is referred to hereafter as the "correlation distance”.
  • the correlation distance is on half
  • segmentation purposes can be calculated. For example, at 915 MHz (a preferred RF
  • packet segments are chosen which provides a quasi-static multipath communication
  • RSSI signal strength indicator
  • a transceiver using direct-sequence spread spectrum transmission uses a spreading-
  • each chip constitutes an
  • the receiver decodes the
  • the frequency and length of the spreading-code can be any frequency and length of the spreading-code.
  • Frequency-hopping is the switching of transmission frequencies according to
  • operating parameters is possible, for example, via selective control of the hopping rate o
  • a parameter indicating the hopping rate can be varied to minimize the
  • To vary the hopping rate is to vary the length of a hopping frame.
  • preferred hopping frame consists of a single exchange of data, For example, in a polling
  • the hopping frame might consist of: 1) a base station transmitting a polling
  • the hop frame length is adjusted to be as long as possible, while
  • Another parameter for changing frequency-hopping performance is that of coding.
  • Coding on the channel for error correction purposes can be selectively used whenever the
  • burst error correction e.g., Reed-Solomon coding
  • the operating parameter for coding indicates whether coding should be used and, if so, the
  • Interleaving involves breaking down the data into
  • the transceiver reconstructs the data from the
  • interleaving would be to sequentially send the data twice without segmentation on two
  • interleaving provides for a redundancy check but at the expense
  • the interleaving parameter determines whether interleaving is
  • the occupied band width is sixteen kilohertz maximum with five kilohertz maximum
  • the receiver to reduce the potential for interference from nearby radio equipment
  • the maximum output power is generally in the range often to three hundred watts.
  • transmitter power output may be
  • antenna height is limited to two watts, maximum, and limitations.
  • NRZ data may be three kilohertz or less.
  • Partial response encoding methods are line coding techniques which allow a potentia
  • PR encoding methods include duobinary and modified duobinary encoding.
  • This approach might also be desirable if the channel bandwidth were reduce
  • the high rate may be utilized.
  • the PR encoding techniques is a hybrid form similar to
  • a transceiver receiving a transmission (hereinafter referred to as
  • the "destination" determines that an operating parameter needs to be changed, it must transmit
  • the source may send an first acknowledge to the destination based on the current
  • the source may also send a "no acknowledge" message, rejecting
  • the destination modifies its currentl
  • the destination receives the request based on the ne
  • the destination transmits repeated requests for acknowledge until receivin
  • the system-default parameters preferably define the most robus
  • th source listens for an acknowledge request from the destination. Once received,
  • each wireless access device of many factors such as: 1) received signal strength; 2) success /
  • devices may also select from a plurality of modes (as described in more detail below in
  • FIG. IB is a flow diagram illustrating the operation of a wireless access device in
  • a wireless access device manages
  • the wireless access device identifies an attach request from a
  • requesting transceiver that may have wandered into the requesting transceiver
  • the access device 403 responds at a block 405 by identifying the available modes of
  • the modes are added to a mode table
  • the requesting device is capable of operating in the currently selected mode, as
  • the wireless access device communicates mode information and
  • the requesting device has a limited number of operating modes, at the
  • the current mode may not be a possibility. If the requesting device is not capable of
  • the wireless access device attempts to select a new mode at a
  • the wireless access device chooses the
  • wireless access device communicates the selected mode and parameter information to the requesting transceiver at the block 413 and returns to the block 401.
  • the wireless access device communicates the selected mode and parameter information to the requesting transceiver at the block 413 and returns to the block 401.
  • the wireless access device vectors to service the event at a block
  • the wireless access device broadcasts the mode and parameter
  • the wireless access device
  • the requesting transceiver is rejected from participating. In such a case, the customer must
  • wireless access device operates in a time shared configurations, switching between two or more modes in a sequential fashion. In this embodiment, however, the overall delays in the system
  • the wireless access device During the course of ongoing operation at the block 401, the wireless access device
  • the wireless access device vectors to consider
  • the wireless access device consults the mode table. If a new
  • access device removes that transceiving device's mode information from active status in the
  • the wireless access device might also periodically attempt to choose
  • FIG. IC is a block diagram illustrating a radio transceiver used in wireless access
  • any transceiving device such as a printer, code reader, hand-held terminal, etc.
  • transceiver module 501 comprises control circuitry 503, a modulator 505, a demodulator 507,
  • the control module may have either an internal or
  • the control circuitry 503 manages the operation of the other components of the
  • the control circuitry 503 receives instructions and data to be
  • circuitry 503 deliver such data to the modulator 505 for modulation (and possibly spreading).
  • the control circuitry 503 receives the demodulated
  • the control circuitry 503 causes the selection of operating parameters and modes as
  • control circuitry 503 sets
  • control circuitry 503 1) sets the base
  • control circuitry 503 1) establishes related parameter settings; 2) disables
  • the spreading and despreading circuits 515 and 517; 3) selects a hopping sequence of
  • control circuitry 515 1) establishes related
  • despreader circuit 517 selects a hopping sequence of frequencies; and 4) directs the
  • control circuitry 503 may select any modes,
  • FIG. ID is a block diagram illustrating the operation of the wireless access device
  • a transceiver having the multi-mode transceiver of FIG. 1 C installed therein.
  • a transceiver having the multi-mode transceiver of FIG. 1 C installed therein.
  • a transceiver having the multi-mode transceiver of FIG. 1 C installed therein.
  • module 501 (as described in relation to FIG. IC) is installed within a wireless access device
  • the wireless access device 503 contains control circuitry 505 and interface circuitry 507
  • control circuitry 505 of the wireless access device 503 manages all mode
  • the control circuitry 505 monitors, among
  • control circuitry 505 also maintains and
  • control circuitry 505 performs such functionality via
  • a transceiver module responds to communication
  • control through commands received from the wireless access device while attempting to attach.
  • transceiver unit the control circuitry of the transceiver module 501 directs entry
  • transceiver module 501 may receive additional mode and parameter
  • control by a transceiver unit may prove advantageous in other wireless network
  • the transceiver units may negotiate a mode and related parameters amongst themselves, controlling such
  • the wireless access device The wireless access device.
  • FIG. 2A illustrates a hand-held portable data terminal which inco ⁇ orates the present
  • the data terminal 10 may be one of several
  • RF radio frequency
  • the data terminal 10 illustrated is a mobile data unit that includes a radio
  • transceiver unit inco ⁇ orating the present invention.
  • the present invention may be inco ⁇ orated into stationary units as well as mobile
  • the stationary units may comprise wireless access points, other function
  • units inco ⁇ orating the present invention need not comprise the hand-held radio format
  • the mobile units could be installed in vehicles, worn by a user, or
  • the data terminal 10 includes an antenna 12 is disposed at the top end 14 of the data terminal for radio frequency transmission and reception.
  • the data terminal may include a
  • display screen 16 for displaying program information and for interfacing the operator with the
  • the display screen 16 may be a reflective super-twist liquid crystal display
  • the data terminal 10 may include a keypad 18 having a plurality of keys
  • FIG. 2B shows the data terminal 10 of FIG. 2A which includes a module in which
  • the data terminal 10 has a modularly attached radio module 20 which also contains scanning circuitry in addition to radio
  • the antenna 12 of FIG. 2A is affixed to the radio/scanner module 20 and may be a
  • the radio/scanner module 20 has
  • an extended outer shell 24 in order to contain both the radio and the scanner circuitry.
  • button 26 may be disposed on either or both sides of the radio/scanner module 20 to activate
  • the scanning circuitry and scan encoded data such as that contained in a bar code or two
  • the module 20 could, in another embodiment, include a digital camera or
  • the radio/scanner module 20 is constructed to be
  • FIG. 3 shows a side view of another embodiment of a data terminal 10 with an alternate
  • the module 30 includes a radio inco ⁇ orating the
  • radio/scanner module 20 of FIG. 2B Because the module 30 is more compact than radio
  • the body of radio module 30 is generally flush with the body of
  • FIG. 4 shows a data terminal 10 that is removably attachable to the radio/scanner
  • terminal 10 generally follows the direction of line 32.
  • the module 20 is positioned toward the
  • L-shaped latches 34 may be
  • FIGS. 4A, 4B and 4C illustrate in detail the cooperation between a radio module and
  • the radio module 30 houses a radio unit
  • An antenna connector 342 connects to antenna connector pins 344 at an end of the radio unit 340 to provide electrical connection to an antenna which may be internally or externally
  • An array of connecting pins 346 preferably connect the radio
  • the radio module 30 may include a hand strap 348, one end of which being connected to the
  • the terminal 10 in one hand and to prevent accidental dropping, for example.
  • FIG. 5 depicts another type of hand-held portable data terminal 36 that inco ⁇ orates the
  • the terminal 36 may have a module carriage housing 38 which may receive various components.
  • Type I 3.3 mm in thickness
  • Type II 5.0 mm in thickness
  • Type III (10.5 mm in thickness) PCMCIA sized modules for example.
  • FIG. 6 shows the data terminal of 36 of FIG. 5 having a rotatably extendible
  • retractable carriage housing 38 The carriage housing 38 is shown in the extended position
  • Type III PCMCIA module 42 which may, for example, contain the radio circuitry of
  • FIG. 7 is an exploded view of the internal components of a radio module 30 of the
  • the present invention such as the module 30 is preferably mounted on a circuit card assembly
  • (CCA) board 44 containing, for example, the transmitter and receiver electronic components
  • the radio CCA 44 may have metallic coverings, or cans (not shown), soldered to
  • the radio module CCA 44 is contained within a metallic radio
  • the radio CCA 44 and radio cover 46 may be attached to a mounting frame 48 which provides supporting structure for
  • Radio cover 46 and mounting frame 48 may
  • ABS type plastic or of a conductive metal to provide electromagnetic
  • the radio CCA 44 and the radio cover 36 may be attached to the mounting frame 48
  • fasteners 50 which may be four #2 screws in a preferred embodiment.
  • An internal antenna 52 may be connected to the radio circuitry of the radio CCA 44 in
  • the radio module 30 may utilize the antenna means of U. S. Patent No. 5,
  • the antenna 53 may comprise a quarter- wavelength single loop of
  • antenna 52 results in a radiation pattern similar to that of a magnetic dipole.
  • An internal shield 56 may be utilized and inserted between the radio circuit card
  • CCA central processing unit
  • RIC radio interface card
  • the radio interface card 58 may be a type used for a 2.4 GHz
  • present invention may be designed to appear as a 2.4 GHz radio accepting the same frequency
  • Electrical connectors 60 may be mounted at an end of the radio interface card 58 for
  • fastener 62 which may be a screw, fastens the radio interface card to the radio module
  • An acoustic-electric transducer such as buzzer 64 may be included with the radio
  • audio information and cues for example a beep or buzz when the radio module 30 is powered
  • Frame mounting screws 66 may be utilized to fasten the assembly to the outer shell 68 via
  • the entire module assembly may be wrapped in a metallic foil to provide
  • the outer shell 68 is preferably a type o
  • ABS plastic is formed to modularly and contiguously fit the recession 28 of the data
  • FIG. 8 is an exploded view of the radio/scanner module 20 illustrated in FIGS. 2B and
  • the components and assembly thereof of the radio/scanner module 20 are substantially identical
  • module 20 for reading optically readable data files such as standard bar codes.
  • radio/scanner module 20 includes radio interface card 58 with electrical connectors 60,
  • the radio/scanner module 20 includes a scanner
  • connection assembly 72 may be utilized to interconnect the electronic circuitry, such as th
  • module is substantially similar to the outer shell 68 of radio module 30 as shown in FIG. 7
  • a rubber nose end cap 76 may be attached to the forward end of the outer shell 74 for
  • a seal label 78 may be used to provide an
  • lens seal support 82 may be disposed in the rubber end cap 76 to provide a sealed light
  • Scanning of an optically readable data file may be controlled
  • scam button 86 which covers am input keyboard and elastomer 84 and is supported by
  • a scan button bezel 88 mounted in a button aperture 90 on a side of the outer shell 74.
  • radio/scanner may have a plurality of scan or input buttons 86.
  • an additional button 86 may be included.
  • button may be provided on the side of the outer shell 74 opposite the button 86 shown in FIG.
  • Frame mounting screws 92 are provided to mount the mounting frame 48 containing
  • the module assembly to the outer shell 74.
  • the outer shell 74 and radio/scanner module are
  • radio module 30 in a manner substantially similar the attachment of radio module 30 to data terminal 10.
  • the entire module assembly 20 may be wrapped in a metallic foil to provide electromagnetic
  • FIG. 9 is an exploded view of the PCMCIA Type III radio module 42 of FIG. 6.
  • PCMCIA radio module 42 may also be constructed within a smaller sized PCMCIA module
  • radio circuit card assembly 44 on a single printed circuit board, for example.
  • PCMCIA radio module 44 may contain the radio circuit card assembly 44 and the radio
  • the radio interface card 58 is preferably adapted to
  • the circuitry of the radio CCA 44 and the radio interface card 68 may be interconnected by a board to board connector 94. Alternatively, all of the circuitry of the RIC 58 and the CCA 44
  • radio modules may be combined on a single printed circuit board for smaller sized radio modules (20, 30 or
  • Standoffs 96 may be soldered directly to the radio interface card 58 and are provided to
  • fasteners 98 preferably #2-56 screws.
  • the screws 98 preferably attach the radio CCA 44
  • a PCMCIA electrical receptacle 102 may be provided to the circuit boards 44 and 58.
  • An antenna connector 104 may be mounted on the radio CCA 44 for connection of the
  • antenna module to an antenna which may be, for example, the antenna 12 of FIG. 2 A, the antenna 52 of
  • Alternate antenna clips 106 may be utilized for adapting the radio module
  • the PCMCIA radio module 42 may be contained within top and bottom covers 108 and
  • the module 110 respectively which are preferably comprised of tin plated cold rolled steel.
  • covers 108 and 110 may provide two way electromagnetic shielding of the radio frequency
  • radio module 42 When the radio module 42 is assembled and contained within top cover 108 and
  • the module preferably conforms to PCMCIA Type III dimensions.
  • module 42 may also be adapted to conform to PCMCIA Type II or Type I dimensions as well.
  • the transceiver module as shown in FIG. 9 may be utilized in a standard desktop or
  • portable computer such as a laptop computer which is designed to utilize standard PCMCIA computer modules.
  • the portable computer may be implemented as part of a multilayered
  • a communication network such as a communications node to communicate, for example, with
  • the computer could serve as a wireless access point, a wireless access
  • a wireless server or another type of wireless device providing access to the wireless network.
  • a wireless network or another type of wireless device providing access to the wireless network.
  • Layer 1 the physical layer
  • MAC medium access control sub-layer of Layer 2 (the data link layer) of the International
  • ISORM Standards Organization Reference Model
  • driver interface to the MAC sub-layer allows the utilization of industry standard multi-layer
  • FIG. 10 is a functional block diagram of an embodiment of the radio modules 20, 30
  • FIG. 10 implement the teachings of the
  • the radio module by causing the radio module to be operable in any of a plurality of spread
  • mobile units in a wireless local area network are capable of operating in a plurality of spread
  • spectrum modes such as direct sequence, channelized direct sequence, frequency hopping,
  • the radio modules to operate in such a fashion.
  • the antenna section includes an antenna 112 for transmitting and receiving radio
  • the antenna 112 may be one of the antennas described in the discussion of
  • the radio circuitry corresponds to the radio circuitry of the radio CCA 44 of FIGS. 7, 8 and 9 and contains the receiver circuitry 1 14, the transmitter circuitry 1 18 and the
  • FREQ. GENERATOR frequency generator
  • the radio frequency (RF) transceiver 298 of the present invention comprises a receiver
  • the transmitter 118 preferably comprises a data formatter and
  • FILTER 146 and 148 (See FIG. 11), a binary phase shift keying (BPSK) modulator (“BPSK
  • TX transmitter up converter and linear transmit power amplifier
  • the receiver 1 14 preferably comprises a receiver down
  • convertor304 a selectable bandwidth intermediate frequency (IF) stage ("SELECTIBLE BW
  • a common radio frequency bandpass filter (“BPF") 399 is shared by both the
  • the transceiver 298 is coupled to an antenna 112 through
  • a frequency generator 1 16 is common to both the receiver 114
  • MAIN VCO frequency agile main VCO output
  • transceiver 298 is switch to the transmit mode.
  • the transmit operation the media access control (MAC) microprocessor ("MAC ⁇ P")
  • the MAC ⁇ P 128 controls the various components illustrated in FIG. 10
  • the MAC ⁇ P 128 may
  • the MAC ⁇ P 128 controls the various elements illustrated in
  • FIG. 10 so as to perform transmission and reception in any of the various spread spectrum
  • the MAC ⁇ P 128 must control the
  • the MAC ⁇ P 128 provides control to the modulator
  • FILTER 150 the DEMODULATOR DESPREADER 184, and the
  • FORMATTER/SPREADER 124 in order to cause the circuitry to perform in the various spread
  • MAC ⁇ P 128 provides control over the elements illustrated in FIG. 10 in a fashion so as to
  • the functions of the baseband formatter/spreader 124 may be contained in a digital
  • ASIC application-specific integrated circuit
  • the ASIC preferably produces
  • the data is mapped into I/Q symbols for either
  • the ASIC generates a synchronous chip clock at a multiple of the
  • the chipping sequence is
  • the main lobe and side lobes are reduced by applying the transversal filters (146 and 148 of
  • FIG. 148 which comprise circuitry of the transversal filter 150 of FIG. 10 with the shift
  • the remainder of the Transmitter 118 is a standard I/Q modem.
  • the I/Q waveforms are
  • modulated signal is filtered to reduce harmonic content, then undergoes a second conversion
  • antenna 112 through the antenna switch 302 and RF bandpass filter 300.
  • the receiver circuitry 118 is switched on and the transmitter
  • the filters 174, 176 and 178 provide rejection of out of band signals for the selected
  • the filtered output is applied to a limiting amplifier, then to the I/Q baseband converter
  • the limiter 182 produces a received signal strength indication that is proportional to log
  • the baseband converter 312 contains an internal divide-by-two circuit which produces
  • the frequency generation system 116 must be programmed to produce the Main VCO
  • a serial interface within the control bus provides this capability. In the DS modes the
  • Main VCO is programmed to the correct channel frequency and remains there until a mode
  • VCO is programmed to the center of the frequency range.
  • the Main VCO is periodically reprogrammed to provide the hopping function.
  • MAC ⁇ P 128 maintains a timer, and table of channels representing the hop sequence.
  • the MAC ⁇ P initiates the hop to the next frequency in the sequence.
  • the MAC ⁇ P 128 provides mode control, host interface, transmit frame generation,
  • channel access control receive frame processing
  • retries of erred packets power management
  • the frequency hopping control is a superset
  • the software interface is structured to comply with the factory industry standards
  • Data to be transmitted is sent via a bus 131 to the MAC circuitry 128 from a host unit.
  • the data to be transmitted is be modulated by the modulator 130 and frequency controlled by
  • the spreader 124 according to the particular spread spectrum transmission mode to be utilized.
  • the spreader 124 receives a chipping clock input that is at a frequency multiple of the source
  • the output of the spreader 124 is sent to the transmitter up converter and
  • the radio modules of the present invention may utilize several modes of spread
  • modules are to be utilized.
  • the modes of operation are be
  • a microprocessor in the host terminal may retrieve stored
  • transmission success rate (e.g. percentages of transmissions) may be saved in nonvolatile
  • Table 1 may be direct sequencing (DS), frequency hopping (FH) or
  • OOK on-off-keying
  • kb/s kilobits per second
  • the radio of the present invention preferably preferably
  • the data terminal in which the radio is utilized thereby has the
  • the data terminal also thereby has the
  • coverage range being a
  • intermediate frequency filter topology may be implemented to achieve interference rejection
  • MODES 1 and 3 are full band direct sequence and provide no inband interference
  • MODE 1 provides
  • MODE 2 is a channelized direct sequence mode having a process gain of 17 dB.
  • MODE 2 provides a reasonable coverage area
  • MODE 4 utilizes full band frequency hopping having a process gain of 17.1 dB.
  • MODE 4 provides moderate coverage area and high system capacity with dynami
  • MODE 5 is a direct sequence mode which is frequency hopped having a process gain of
  • MODE 5 provides a long and high coverage area
  • MODE 6 is an on-off-keying (OOK) modulation mode having a process gain of 0 dB.
  • MODE 6 may be utilized as a low speed, low power link to a nearby scanner or printer for
  • the transceiver module is intended to communicator with peripheral devices
  • the Main VCO is set to the center frequency of the
  • peripheral AM receiver For OOK transmission, the data formatter is configured to produce a
  • OOK signaling is providing by strobing the enable line on the transmitter
  • the Main VCO is set to receive at the AM transmitter center
  • the RSSI output from the limiting amplifier is used for AM detection.

Abstract

Module (501) émetteur-récepteur de données destiné à des transmissions de données numériques dans un terminal de transmission de données portatif, comportant de multiples modes de données à spectre étalé incluant des algorithmes de modulation à suite directe et à fonction de fréquence. Ledit module (501) émetteur-récepteur comporte de multiples cadences de transfert, modulations, découpages en canaux et gains de procédé configurables par l'utilisateur ou par le programme afin de maximaliser la qualité des transmissions de données radioélectriques et l'immunité à l'égard du brouillage. Des dispositifs d'accès sans fil dans un réseau à base de cellules étudient chacun une grande variété de facteurs lorsqu'ils choisissent un mode de fonctionnement sans fil parmi une pluralité de tels modes et des paramètres d'exploitation associés. Une telle sélection définit une voie de communication pour supporter les échanges sans fil de données, de messages et de communications. Dans d'autres modes de réalisation, les dispositifs d'accès sans fil supportent également une seconde voie, un signal d'occupation/de commande pour gérer la communication sur la principale voie de communication et vaincre les problèmes de déplacement et les problèmes cachés de terminal.
PCT/US1996/009474 1993-12-20 1996-06-03 Module emetteur-recepteur a spectre etale faisant intervenir la transmission en mode multiple WO1996038925A1 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US08/973,195 US6697415B1 (en) 1996-06-03 1996-06-03 Spread spectrum transceiver module utilizing multiple mode transmission
AU64762/96A AU6476296A (en) 1995-06-01 1996-06-03 Spread spectrum transceiver module utilizing multiple mode t ransmission
US09/357,429 US6665536B1 (en) 1993-12-20 1999-07-20 Local area network having multiple channel wireless access
US10/648,707 US7107052B2 (en) 1993-12-20 2003-08-26 Local area network having multiple channel wireless access
US10/648,726 US7013138B2 (en) 1993-12-20 2003-08-26 Local area network having multiple channel wireless access
US10/684,650 US7676198B2 (en) 1996-06-03 2003-10-14 Spread spectrum transceiver module utilizing multiple mode transmission
US10/765,451 US20050048963A1 (en) 1996-06-03 2004-01-27 Configurable premises based wireless network and operating protocol
US11/288,024 US20060182074A1 (en) 1996-06-03 2005-11-28 Configurable premises based wireless network and operating protocol
US11/496,950 US7710907B2 (en) 1993-12-20 2006-08-01 Local area network having multiple channel wireless access
US11/497,499 US7710935B2 (en) 1993-12-20 2006-08-01 Local area network having multiple channel wireless access
US12/720,231 US20100158077A1 (en) 1996-06-03 2010-03-09 Spread spectrum transceiver module utilizing multiple mode transmission

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US45769795A 1995-06-01 1995-06-01
US08/457,697 1995-06-01
US08/513,658 US6714983B1 (en) 1989-04-14 1995-08-11 Modular, portable data processing terminal for use in a communication network
US08/513,658 1995-08-11
US54481595A 1995-10-18 1995-10-18
US08/544,815 1995-10-18
US64534896A 1996-05-13 1996-05-13
US08/645,348 1996-05-13

Related Child Applications (3)

Application Number Title Priority Date Filing Date
US08/973,195 A-371-Of-International US6697415B1 (en) 1996-06-03 1996-06-03 Spread spectrum transceiver module utilizing multiple mode transmission
US08973195 A-371-Of-International 1996-06-03
US10/684,650 Continuation US7676198B2 (en) 1996-06-03 2003-10-14 Spread spectrum transceiver module utilizing multiple mode transmission

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US8824882B2 (en) 2007-05-29 2014-09-02 Lab Partners Associates, Inc. TTL photographic wireless communication system and method
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US8326140B2 (en) 2007-05-29 2012-12-04 Lab Partners Associates, Inc. External photographic wireless communication device and method
US8571401B2 (en) 2009-02-12 2013-10-29 Lab Partners Associates, Inc. Systems and methods for changing power states of a remote device using one or more camera body controls and a preset delay
US8326141B1 (en) 2009-02-12 2012-12-04 Lab Partners Associates, Inc. Systems and methods for changing power states of a remote device using one or more camera body controls and a preset delay
US8705950B2 (en) 2009-02-12 2014-04-22 Lab Partners Associates, Inc. Early photographic critical point synchronization system and method
US8614766B1 (en) 2009-02-12 2013-12-24 Lab Partners Associates, Inc. Systems and methods for controlling a power state of a remote device using camera body backlighting control signaling
US8917350B2 (en) 2009-02-12 2014-12-23 Lab Patners Associates, Inc. Early photographic synchronization system and method
US9354491B2 (en) 2009-02-12 2016-05-31 Lab Partners Associates, Inc. Photographic synchronization optimization system and method
US8718461B2 (en) 2009-02-12 2014-05-06 Lab Partners Associates, Inc. Photographic synchronization optimization system and method
US8571406B2 (en) 2009-02-12 2013-10-29 Lab Partners Associates, Inc. Early photographic predictor signal synchronization system and method
US8538250B2 (en) 2009-02-12 2013-09-17 Lab Partners Associates, Inc. Systems and methods for communicating with a device using one or more camera body controls
US10824053B2 (en) 2009-02-12 2020-11-03 Lab Partners Associates, Inc. Photographic synchronization optimization system and method
US8600224B2 (en) 2010-07-14 2013-12-03 Lab Partners Associates, Inc. Photographic wireless communication protocol system and method
EP2900002A4 (fr) * 2012-09-21 2016-06-01 Mitsubishi Electric Corp Dispositif de communication sans fil, et système de communication sans fil
US10578950B2 (en) 2013-11-04 2020-03-03 Lab Partners Associates, Inc. Photographic lighting system and method
US9690169B2 (en) 2013-11-04 2017-06-27 Lab Partners Associates, Inc. Photographic lighting system and method

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CA2215805A1 (fr) 1996-12-05

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