Motorola Corporation

Bruce C Eastmond

Rachid M Alameh

S David Silk

Sharon E Phillips

Julian H Richardson

David P Gurney

Stephen Leigh Kuffner

Timothy J Collins

Richard Stanley Rachwalski

Donald L Linder

Mark Conrad Cudak

Thomas A Freeburg

Jeffrey A Dykstra

Thomas J Walczak

Leon Jasinski

Kevin W Jelley

James F Kepler

Elliott W Lum

Sharon E Thompson

Wai Elliott Lum

A method and apparatus for wirelessly transmitting data between two devices () is provided herein. During data transmission, a data and a strobe signal are transmitted simultaneously on the I and Q-channels, respectively, of over-the-air interface. More particularly, QPSK modulation is utilized, with the strobe signal being transmitted via the I-channel, and the data signal being transmitted via the Q channel, (or vice versa). Additionally, illegal constellation transitions are utilized to signal the transmission of control information.

Method and apparatus for wireless data transfer

A communications method including the steps of: receiving signals from at least one signal source during a first signal source transmission; estimating at least one signal source parameter based on the received signals during the first signal source transmission; receiving signals from at least one signal source during a second signal source transmission; and determining a difference between the first and second signal source transmissions using the at least one estimated signal source parameter.

Method and apparatus for electronic item identification in a communication system using known source parameters

A source device ( ) stores predetermined data and establishes a channel selection profile comprising a plurality of channel selections. Each channel selection is derived from a subset of the predetermined data. The source device ( ) transmits at least a portion of the predetermined data over at least a first channel selected from the channel selection profile.

Channel selection method used in a communication system

A data transmission system (,) includes a data transmission terminal (,) and a portable data device (,) that is remotely powered by the terminal. A method is provided for supplying power and data from the terminal (,) to the portable data device (,) using a carrier signal (,), including the step of identifying a slot location into which a modulation discontinuity (,) is introduced. The slot location is chosen within a modulation frame, which is based on n bits of the information signal to be transmitted, the number of slots in the frame varying between 1 and 2,. The modulation discontinuity (,) is introduced into the chosen slot location to produce an encoded data stream, which is then transmitted to the portable data device.

Data transmission terminal and contactless data/power delivery method for use therewith

A waveform encoding method and device provide for generating/receiving a power efficient binary intensity modulated optical data signal from a binary source signal which minimizes a time between adjacent pulse transitions and maximizes a pulse peak amplitude for transmission over a low-power wireless infrared link. In generating the signal, the method includes: generating a Q-ary pulse position modulation, Q-PPM, encoded data signal from binary data where Q represents 2.sup.L time slots and L is a predetermined integer representing a predetermined number of binary source bits of the power efficient binary intensity modulated optical data signal; generating an efficient binary intensity modulated signal by increasing the pulse peak amplitude of the Q-PPM encoded data signal by a factor of k, k a predetermined value, and decreasing a pulse width of the Q-PPM encoded data signal by k; and transmitting the efficient binary intensity modulated signal over the low-power wireless infrared link.

Efficient encoding and detection method and device for binary intensity

A method, access point device and a plurality of peripheral devices provide for controlling a space diversity switch in a time division duplex system. The method includes: inputting data to a peripheral; generating a CRC.sub.1 in a peripheral; transmitting the data and the CRC.sub.1 ; receiving, by an access point device, the data with the CRC.sub.1 ; extracting CRC.sub.1 and generating CRC.sub.2 from received data; determining whether CRC.sub.1 and CRC.sub.2 are equal and where CRC.sub.1 and CRC.sub.2 are equal, failing to generate a repeat request; where CRC.sub.1 and CRC.sub.2 are unequal, generating a repeat request; determining whether a number of requests=N; where the number of requests.noteq.N, incrementing a counter and returning to receiving the data with the CRC.sub.1 ; and where the number of requests=N, resetting the counter, changing an antenna state and returning to receiving, by an access point device, the data with the CRC.sub.1.

Method access point device and peripheral for providing space diversity

A method (600), device, wireless transceiver, computer and personal digital assistant (300, 400) provide collision presence detection in wireless intensity-modulated binary-coded data transceivers which is compatible with the collision detection employed in IEEE standard 10BASE-T Ethernet. A measurement of the degree of correlation which exists between the signal transmitted and the signal received provides a basis for efficient collision detection in CSMA systems.

Method, device, wireless transceiver and computer for providing

The present invention provides a modem (100), method (300) and device (103) for indicating received signal strength and presence for intensity modulated binary-coded data packets with reduced recovery time in a packet data receiving system. The device includes a receiver for binary coded wireless data packets having a first band-pass processing unit, for receiving modulated electromagnetic signals and converting the modulated electromagnetic signals to binary data signals and a second band-pass processing unit, coupled to the receiver, for providing a logarithmic received signal strength indicator signal, RSSI, using a low-frequency cutoff f.sub.L2 greater than a low-frequency cutoff f.sub.L1 of the first band-pass processing unit.

Modem method and device for indicating received signal strength and

The present invention provides a method (200), transceiver (100), and system (900) for providing wireless communication compatible with 10 BASE-T Ethernet. In the transceiver, an absence detector receives a transmitted signal, determines an absence of the transmitted signal, and passes the absence to an activity detector in order to differentiate between a reflected signal and a received signal in a half duplex system. The activity detector receives the received signal and determines an operation time signal in which the received signal is absent.

Method, transceiver, and system for providing wireless communication

A positioning device (100) provides adaptive positioning for at least a first optical signal to facilitate a serial simplex broadcast between one of: a plurality of transmit communication units and a receive communication unit and at least a first transmit communication unit and a plurality of receive communication units. The transmit communication unit (102) includes an optical transmitter unit (104) for generating a free-space, collimated light beam (126), and the receive communication unit (106) includes an optical receiver unit (108) for detecting a portion of light beam (126) for communication between the transmit communication unit (102) and the receive communication unit (106).

High-speed serial simplex broadcast data distribution using optics

The present invention provides a method (200), transceiver (100), and system (900) for providing wireless communication compatible with 10BASE-T Ethernet. In the transceiver, an absence detector receives a transmitted signal, determines an absence of the transmitted signal, and passes the absence to an activity detector in order to differentiate between a reflected signal and a received signal in a half duplex system. The activity detector receives the received signal and determines an operation time signal in which the received signal is absent.

The present invention provides a method (100), an apparatus (400), and a communication device (700) for automatically maintaining a state of full charge in a charge storage device, such as a secondary battery (414), to which a fixed load (412) is momentarily connected. Since the load is fixed, a predetermined amount of charge is removed from the charge storage device each time the load is connected. A counter (404) is incremented while the load (412) is connected. From the count, the amount of charge that must be replaced can be determined. As the charge is replaced the count is decremented.

Method, apparatus, and communication device for charging a charge

Binary encoded data may be detected in a stream of data, by first detecting data transitions. From the detected data transitions, a first pulse is generated when successive data transitions are detected within a predetermined period of time and a second pulse is generated when successive data transitions are not detected within the predetermined period of time. The first and second pulses have the same duration but the amplitude of the first pulses is half of the amplitude of the second pulses. The first and second pulses are filtered by a bandpass filter and compared with a predetermined threshold. When the filtered pulses are above the predetermined threshold, the received stream of data is binary encoded data. When the filtered pulses are below the predetermined threshold, the received stream of data is not binary encoded data.

Method and apparatus for detecting binary encoded data

A wireless infrared (IR) communications system (100) for communicating packetized information (302) between a control module (12) and a plurality of UMs (14) via infrared transceivers (300/320) is described as having a selectable communications path. In this system at least the user module (14) has a plurality of IR device arrays (A1-A6) for receiving IR signals (312/312') in relatively narrow IR field of view sectors, and selection circuit (20), coupled to said plurality of IR device arrays (A1-A6), for selecting a communication path between the control module (12) and one of said plurality of IR device arrays (A1-A6), based at least partly on received signal (302') qualtity, so as to overcome reception errors caused by multipath interference.

High bit rate infrared communication system for overcoming multipath

A wireless binary coded optical data receiver receives the binary encoded data via a photodiode. The binary encoded data is then supplied to the primary winding of a transformer and thus coupled to the secondary winding of the transformer. The secondary winding is coupled to a transimpedance amplifier wherein the transimpedance amplifier buffers the received binary encoded data. The buffered binary encoded data is then amplitude limited by a limiting circuit.

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Downers Grove, IL, United States of America

Bruce C Eastmond