Hughes Electronics Corporation

Combasis Technology, Inc.

Symbol Technologies, LLC

Seok Ho Kim

David Alan Roos

Adrian J Morris

Kumar Swaminathan

Mohammad Soleimani

Enrique Laborde

Robert Carroll Marquart

James Eryx Malcolm

Hyokang Chang

Jens Arnold

Victor Hugo Molina

Neeraj Tewari

Hykong Chang

Daniel Fraley

Methods, systems, and apparatuses for verifying singulated tags are described. A radio frequency (RF) signal is transmitted to provide power to at least one tag. A powered tag is singulated. A delay time period is waited. A read verify command is transmitted to the singulated tag. A response is received to the read verify command. The response to the read verify command is verified to determine whether it was received from the singulated tag.

Verification of singulated RFID tags by RFID readers

A memory configuration scheme that enables parallel decoding of a single block of turbo-encoded data is described. In this scheme a single code block is divided into multiple subblocks and decoding is performed on subblocks in parallel. The turbo decoder memory is configured so that subblock decoders can access the common memory resources independently of each other. This scheme is different from existing parallel decoding schemes in that it achieves the parallel implementation by applying multiple decoders to a single code block, not by assigning multiple decoders to multiple code blocks. The advantages of this scheme include minimum memory requirement and minimum decoding latency. The minimum memory requirement results from the fact that it needs memory resources only for a single code block regardless of the number of decoders used. The decoding latency is minimum since decoding of a code block is over when decoding on subblocks is completed.

Memory configuration scheme enabling parallel decoding of turbo codes

System and method for accelerating the convergence rate of turbo decoding by verifying bits in data frames whose CRC shows no bit errors. Verified bits are translated to bound nodes on a trellis of nodes representing a sequence of bits of the encoded code block. Verification of all bits signals a stop condition and decoding iterations can be terminated. Further, state transition metrics are limited when a node is adjacent to a bound node, allowing for acceleration of convergence by elimination of impossible state transitions. Also disclosed is a scheme to detect bit errors when the code block contains unframed data or partial data frames. This bit error detection scheme uses a recursive encoder to establish end node status. The end node state determination accelerates convergence rate recognition when incorporated with other stop conditions.

Acceleration of convergence rate with verified bits in turbo decoding

A method and system for alerting a mobile terminal in a high-attenuation propagation environment within a mobile satellite communication network are disclosed herein. The method comprises receiving an incoming call directed to the mobile terminal, generating a paging signal in response to the incoming call, determining whether the mobile terminal has failed to receive the paging signal, and generating an alerting signal in response to the determination that the mobile terminal has failed to receive the paging signal. The system comprises a plurality of mobile terminals capable of receiving voice calls via a satellite; a satellite adapted to communicate with each of the mobile terminals, the satellite transmitting a spot beam to the mobile terminals; at least one gateway in communication with the satellite, the gateway having a first signal generator for producing a paging signal in response to an incoming call, logic for determining whether the mobile terminal has detected the paging signal, and a second signal generator for producing a high-power alerting signal in response to the logic; a first detector in the mobile terminal for detecting the paging signal; and a second detector in the mobile terminal for detecting the alerting signal.

Method and system for mobile alerting in a communication system

The present invention relates to a device and a method for communicating in a mobile communication system. The method provides a carrier signal having a plurality of frames. Each frame has a plurality of time slots, and each time slot comprises a plurality of transmission bits. A group of time slots are assigned to a communication channel. A traffic burst signal having a plurality of traffic symbols is transmitted over the communication channel by transmitting a first preamble over one of the assigned time slots, and transmitting a second preamble and at least one of the traffic symbols over at least one of the other assigned time slots. The second preamble occupies fewer transmission bits than the first preamble. The apparatus for transmitting a telephony signal over an RF channel includes a modem receiving a digitized PCM telephony signal and producing a traffic burst signal, and a transmitting unit in communication with the modem for transmitting a FDMA/TDMA signal carrying a plurality of traffic burst signals. At least one of the traffic burst signals carries a limited preamble message including a header field and a unique word field and at least one digitized voice message associated with a telephone call. Another traffic burst signal carries at least one signal acquisition message including a unique word field.

Device and method for communicating in a mobile satellite system

Growing community of inventors

North Potomac, MD, United States of America

Seok Ho Kim