Abstract: A data transmission system (200) includes a data transmission terminal (201) and a portable data device (203) that is remotely powered by the terminal. A method is provided for supplying power and data from the terminal (201) to the portable data device (203) using a carrier signal (401), including the step of identifying a slot location into which a modulation discontinuity (403-409) 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 2n. The modulation discontinuity (403-409) is introduced into the chosen slot location to produce an encoded data stream, which is then transmitted to the portable data device.

Abstract: 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.

Abstract: 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.

Abstract: 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).

Abstract: A two-way FM radio transmitter-receiver operates on a single channel and automatically samples the channel during transmissions to sense the presence of a carrier wave. The transmitter is actuated by use of a transmit key which starts timing means to produce a time interval, and at the end of the time interval a sample generator is actuated for a very short time period to turn off the transmitter, disconnect the antenna from the transmitter, and connect the antenna to the receiver. A detector coupled to the squelch circuit of the receiver at the transmitting station detects the presence of a carrier wave on the channel, and the detector output produced in response to a carrier wave acts to hold the transmitter off and allow the receiver to reproduce the received wave. When the transmitter is turned off for the short time period, the absence of the carrier will cause the FM receiver at the receiving station to produce a burst of noise.