Abstract:
A wireless repeater employing echo cancellation uses a non-linear element in digital baseband to compress the digital transmit signal waveform, thereby allowing distortions in the transmitter circuit as well as interference to be cancelled. In one embodiment, the repeater applies non-linear baseband compression to the digital transmit signal in the digital domain to reduce the peak-to-average amplitude of the digital transmit signal prior to digital-to-analog conversion and prior to over-the-air transmission and prior to sampling of the digital transmit signal for use as the reference signal for echo cancellation. The intentionally introduced non-linear distortion in the transmit signal improves echo cancellation and stability of the repeater. In one embodiment, the non-linear compression is applied only when the digital transmit signal is at or exceed a given power level or a given gain level.
Abstract:
A forward error correction (FEC) block size is maintained at a constant size. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. Therefore, as the number of information bits per symbol is changed, the number of output bits is always maintained. The scheme permits for a greater flexibility and selection of effective data rates.
Abstract:
The present invention provides for making code rate adjustments and modulation type adjustments in a pseudonoise (PN) encoded CDMA system. Coding rate adjustments may be made by changing the number of information bits per symbol, or Forward Error Code (FEC) coding rate. A forward error correction (FEC) block size is maintained at a constant amount. Therefore, as the number of information bits per symbol are increased, an integer multiple of bits per epoch is always maintained. The scheme permits for a greater flexibility and selection of effective data rates providing information bit rates ranging from, for example, approximately 50 kilobits per second to over 5 mega bits per second (Mbps) in one preferred embodiment.
Abstract:
A variety of options for for fracture fixation after total hip arthroplasty or total knee arthroplasty. The ability to pre-engineer fracture fixation contingent solutions into femoral or tibial components provides a distinct clinical advantage in the planning and execution for periprosthetic fracture fixation. Methods and apparatus include targeting devices allowing for intimate association of fixed angle locking screws in pre-drilled holes in an existing prosthetic, femoral nail, or other components including additional fixation components. Such apparatus and methods further include alignment devices and other components to allow for ease of repair of periprosthetic fractures utilizing the pre-engineered solutions.
Abstract:
A subscriber unit, including an antenna array and an antenna array interface coupled to the antenna array, is described. Wireless transmissions, at least two of which are based on different directional transmissions from a transmitter, are received at the antenna array. Feedback messages are generated using the antenna array interface. The feedback messages are communicated using the antenna array to adjust settings of the transmitter.
Abstract:
A communication system, such as a wireless CDMA system, detects markers with fewer errors by having field units transmit the markers at different power levels (e.g., 9 dB for one marker and 11 dB for another marker). The difference in power levels of the markers allows the base station to identify the request markers using alternative criteria with a low probability of error, where the alternative criteria may include comparing the markers to respective energy level thresholds, monitoring occupancy of time slots, occupancy of mutually exclusive code channels, or combinations thereof. For example, in one particular embodiment, a request marker, which is generally a high priority marker, is transmitted with higher power, which improves the probability of detection and reduces the probability of false detection of the request marker.
Abstract:
A system and method are provided for allocating wireless channels in a base station processor to messages sent between a subscriber and the base station processor in a wireless network. A latency period is determined corresponding to a return message to be received from a responsive node in response to an outgoing message sent from a sender via the base station processor. A latency manager in the base station processor computes the latency period and stores the latency period in an allocation table. A scheduler schedules a channel to be available at the end of the latency period indicated in the allocation table. At the end of the latency period, the return message is received and the scheduler allocates a channel as defined in the allocation table. The scheduled channel is used to transmit the message to or from the corresponding subscriber.
Abstract:
A transmitter/receiver system for high data transfer in a wireless communication system includes a physical layer processor that comprises an FEC coder, a demultiplexer and a plurality of modem processors. The FEC coder applies error correction codes to the high data rate signal. Thereafter, the demultiplexer distributes portions of the coded high data rate signal to the modem processors. Each modem processor processes its respective portion of the coded signal for transmission in an independent channel.
Abstract:
A server exchanges information between one or more wireless devices. The server receives second device identifier information from a first wireless device using a wide area wireless network The second device identifier information was previously provided to the first wireless device via short range wireless communication. The server then uses the second device identifier information to determine additional information concerning an entity or object located in proximity to the second device, and then delivers information to the first wireless device or the second wireless device based at least in part upon the second device identifier and feedback ratings relevant to an entity associated with either the first wireless device or the second device identifier.
Abstract:
A server facilitates a transaction between a first wireless device and a second wireless device. An identifier associated with the second wireless device has been sent to the first wireless device using a short range wireless connection; the server receives the identifier. The server then determines location information associated with both the first and said second wireless devices. If the location of the first and second wireless devices is appropriate for authorizing the transaction, the server then determines authentication information relating to the second wireless device. The server then provides authorization to the first or second wireless device to proceed with the transaction. The authorization may be based at least in part upon the identifier, the authentication information and the locations of said first and second wireless devices.