Teledesic LLC

Litton Systems, Inc.

Csr Technology Inc.

Sirf Technology, Inc.

Social Fabric Corporation

Navsys Corporation

Menache LLC

Csr Technology Holdings Inc.

Leo One Ip, L.l.c.

Wengen Wireless LLC

Gigabeam Corporation

Sturza, Mark A.

Mark Alan Sturza

David Palmer Patterson

Alison K Brown

Donald Leimer

Farzad Ghazvinian

James R Stuart

Sami M Hinedi

Sanjai Kohli

Douglas Gene Lockie

Edward F Tuck

Moshe L Liron

Alberto Menache

Janet L King

Shiva S Sarrafan

Biren N Shah

Yi-Zen Wu

Wayne L Knitter

Thomas L Hayden

Kenneth C Grzemski

Richard C Deininger

Steven A Gronemeyer

Paul A Underbrink

Vilnis G Grencions

Sharath Ananth

Karl R Griep

Asu Ram Jha

Samson Million

Len Quadracci

David A Bayer

Jose Manuel Villalvazo

Arthur K Peters

Erik J Goldman

Steven W Smith

Martie G Haselton

Rebecca B Weeks

Donald A Ashford

Robert G Quinn

H Beat Wackernagel, Deceased

Sami Hinedi

A method is provided for decimating a digital signal by a factor of M and matching it to a desired channel bandwidth. The method applies the digital signal input samples to a (M&#x2212;1) stage tapped delay line, downsamples the input samples and the output samples of each tapped delay line stage by a factor of M, and applies each of the M downsampled sample value streams to M allpass IIR filters, respectively. The M allpass IIR filtered sample streams are then summed and scaled by a factor of 1/M. The result can then be filtered by a digital channel filter.

Multi-standard multi-rate filter

Systems and methods are disclosed herein to use sieving to reduce the number of hypotheses and the length of time for acquisition of GPS satellite signals. In sieving, hypothesis testing is performed after a short non-coherent integration duration on a first set of hypotheses. At the end of the non-coherent integration time, multiple candidate hypotheses having high likelihood of signal detection are identified. Further non-coherent integration of each candidate hypothesis is performed by using a tracking loop to remove Doppler frequency and code phase variations on the signal. In parallel, additional hypotheses testing is performed on a second set of hypotheses. At the end of the next non-coherent integration time, the best candidate hypotheses among the candidate hypotheses sieved from the first set of hypotheses running in the tracking loops and the candidate hypotheses from the second set of hypotheses are identified. This new set of candidate hypotheses replaces the previous candidate hypotheses and is tracked by the tracking loops. This process of short non-coherent integrations followed by track is repeated until a candidate hypothesis has a non-coherent integration that exceeds a detection threshold.

System and method for use of sieving in GPS signal acquisition

A wireless device including a transceiver that utilizes a power supply is described. The wireless device includes a Global Positioning System ('GPS') section having a plurality of GPS subsystems and a power controller in signal communication with the power supply and GPS section, wherein the power controller is configured to selectively power each GPS subsystem from the plurality of GPS subsystems.

System and method for operating a GPS device in a micro power mode

A method is provided for decimating a digital signal by a factor of M and matching it to a desired channel bandwidth. The method applies the digital signal input samples to a (M-1) stage tapped delay line, downsamples the input samples and the output samples of each tapped delay line stage by a factor of M, and applies each of the M downsampled sample value streams to M allpass IIR filters, respectively. The M allpass IIR filtered sample streams are then summed and scaled by a factor of 1/M. The result can then be filtered by a digital channel filter.

A method for designing a digital filter, includes: (a) selecting a predetermined number of current sets of coefficients for the digital filter; (b) selecting a metric for evaluating coefficients of the digital filter; (c) computing a metric for each current set of coefficients; (d) deriving a next set of coefficients based on a subset of the current set of coefficients; (e) computing the metric for the next set of coefficients; (f) replacing a selected one of the current set of coefficients based on comparing the metric for the next set of coefficients with the metric for the selected current set of coefficients; and (g) iterating steps (a) to (e) until a termination criterion is met. In one embodiment, the selected metric represents a desired stop band response. The next set of coefficients may be derived by adjusting a first current set of coefficients by a weighted difference between a second current set of coefficients and a third current set of coefficients. The weighted difference may be obtained by multiplying a predetermined factor to the difference between the second current set of coefficients and the third current set of coefficients. In one embodiment, a scaling is performed such that the next set of coefficients does not include a pole outside of the unit circle.

Differential evolution design of polyphase IIR decimation filters

Methods and apparatus for finding a match between or among persons (), characteristics and/or objects are disclosed. In one embodiment of the invention, an electronic device (), such as a handheld radio, is used to find a person who meets criteria specified by a user. In another embodiment, this electronic device () is programmed with information regarding the genetic attributes () of individuals. These individuals are matched by computing a correlation of the genetic attributes of two individuals (). The information regarding these genetic attributes are determined by testing a tissue or fluid sample. In yet another embodiment of the invention, once biological or genetic attributes () are determined, a perfume () may be manufactured which is based on a unique set of genetic attributes, and which may either fortify the sexual self-confidence and broadcast the attributes of the person who wears the perfume, or may be used to enhance the attractiveness of another person.

Matching system

A frequency domain diversity DVB receiver device includes multiple antenna ports for receiving radio signals, and radio signal processing circuits connected to the antenna ports that convert the received radio signals into digital samples. The digital samples from the different antenna ports time-share a front-end processor which processes the digital samples to provide time-domain symbols. The time-domain symbols are stored in time-domain symbol buffers according to which of the antenna ports the time-domain symbols are received. A fast fourier transform circuit then retrieves the time-domain symbols and converts them frequency-domain symbols, which are then stored one or more frequency-domain symbol buffers according to the antenna ports the corresponding radio signals are received. A diversity processor which combines the frequency-domain symbols from the frequency-domain symbol buffers.

Memory efficient OFDM channel estimation and frequency domain diversity processing

Small radio frequency tags for use in a motion capture system include a power source, circuitry for generating radio frequency identification signals, an antenna for transmitting the signals, and means for automatically activating the tags so that the tags begin transmitting the signals including a tag identification code when a cover is removed. The activation means may include a release strip that, when removed, opens or closes an electrical circuit that activates the tag and also exposes an adhesive covered surface of the tag so that the tag can then be adhered to a clothed or unclothed human body or other object to be tracked. The activation means can also include an optical sensor, an oxygen sensor, or other sensors. The battery and the antenna may be printed or constructed of film, thus allowing the tag to be small, thin, and flexible.

Radio frequency tags for use in a motion tracking system

Methods and apparatus for a high speed wireless communication system are disclosed. The high speed wireless links are accomplished using relatively narrow beams (&#x3c;1&#xb0;). These beams are produced using rotational motion at a base station in the center of a cell. In one embodiment of the invention, a radio and an antenna are mounted on a rotating element attached to a vertical mast. In another embodiment, a rotating mirror is employed to produce reflected beams. The present invention may be implemented using the 71-76 GHz, 81-86 GHz, and/or 92-95 GHz frequency bands.

Multiple-point to multiple-point communication system

A radio frequency (RF) motion capture system includes stationary sensor receivers, one or more transmitter marker tags on one or more objects to be tracked within a capture zone, at least one stationary reference tag transmitter, and a processing system for processing the received signals. The individual tags transmit burst of spread-spectrum RF signals. The transmitted signals include a common sync code, and a tag identification code that is unique to each tag. By computing double differences of pseudoranges, clock terms are cancelled out allowing the processing system to precisely determine the location of each tag as it moves through the capture zone without the need to synchronize clocks between sensors and tags. The system can be used for RF match moving.

Radio frequency motion tracking system and method

A scalable satellite data communication system that provides incremental global broadband services using Earth-fixed cells may begin with a limited satellite deployment that initially serves a limited number of Earth-fixed cells. The system has the flexibility to incrementally increase the number of Earth-fixed cells that are served, with minimal constraints on the relative locations of the cells on the Earth, by adding satellites of potentially greater complexity to the system. Backward compatibility with existing user terminals is achieved by maintaining the same satellite communication interface as with the already-deployed satellite constellation. Continuous and/or non-continuous service may be provided to selected Earth-fixed cells. Scheduled non-continuous service is particularly advantageous for bulk data transport services. Satellites may use simple mechanically-steered antennas. Communication links may be handed from one satellite to another when one satellite moves out of range and is no longer able to cover a selected Earth-fixed cell.

Scalable satellite data communication system that provides incremental global broadband service using earth-fixed cells

A communication system ( ) is disclosed which provides two-way communications access to a wide area network (WAN)( ) for a very large number of subscribers ( ). It offers an inexpensive &ldquo;last-mile&rdquo; hookup from a subscriber terminal ( ) to a communications hub ( ). The hub ( ) is connected to a WAN ( ) such as the Internet. The system comprises service areas ( ), 0.7 to 1.5 km radius ( ), wherein the hub ( ) and subscribers ( ) are located. Subscribers ( ) are connected to a subscriber terminal ( ), directly or through a local area network (LAN)( ). Each terminal ( ) communicates with the hub by a SHF radio link ( ). Distributed routing of signals provides subscribers ( ) with no-waiting, transmission of information at speeds about ten Mbps. Availability of a communication path approximates a fiber optic cable. The LAN ( ) may be a local public switched telephone network. Each service area ( ) is divided into one to forty sectors ( ). Eight sectors ( ) can support approximately 1,600 subscribers ( ). Service areas ( ) may be arranged to cover larger areas. Overlapping service areas ( ) permit subscribers ( ) to be within line-of-sight of a hub ( ). Service area arrangement is readily adapted to terrain, existing structure and number of subscribers ( ).

Network access communication system

A data communication system for a constellation of low-Earth orbit (LEO) satellites (13a, 13b, . . . ) that employ Earth-fixed cellular beam management technology is disclosed. The data to be communicated is formed into data packets by a transmitting ground terminal (41). Each data packet includes a header (41) and a payload (43). The header (41) contains address and other control information and the payload (43) contains the data to be communicated. The header and payload databits are separated (71) and outer forward error correction (FEC) encoded (72, 73) with an outer error correction code. The symbols of the outer encoded header and payload codewords are interleaved, first separately (74, 75) and then together (76). The outer encoded, interleaved header and payload codewords are inner encoded by an inner FEC encoder (77). Upon receipt by an uplink satellite (63), the inner error correction code is removed (87) and the resulting codeword symbols are de-interleaved (88, 89, 90). The outer error correction code of the header portion is then removed (91) to recover the header of the original signal. The information contained in the header is used to route the data packets through the satellite constellation to the appropriate downlink satellite (93). The downlink satellite re-outer encodes the header (95) and the symbols of the re-outer encoded header and the still outer encoded payload codewords are separately interleaved (96, 97) and then interleaved together (98). The interleaved re-outer encoded header and outer encoded payload databits are re-inner encoded (99). Upon receipt by a receiving ground terminal (107), the data packets are inner decoded (111) to remove the inner error correction code and the symbols of the header and payload codewords are de-interleaved (112, 113, 114). Then the header and payload codewords are outer decoded (115, 116) to remove the outer error correction codes and recover the header and payload. Preferably a payload filter (117) is included to eliminate the need to outer decode payload codewords not destined for the receiving ground terminal (107).

Coding system and method for low-earth orbit satellite data communication

The Satellite Communication System disclosed in the specification is a dynamic constellation (C) of satellites (S). The present invention is capable of offering continuous voice, data and video service to customers across the globe on the land, on the sea, or in the air. The preferred embodiment of the invention comprises a low Earth orbit satellite system that includes 40 spacecraft (S) traveling in each of 21 orbital planes at an altitude of 700 km (435 miles). This relatively large number of satellites employed by the preferred embodiment was selected to provide continuous coverage of the Earth's surface at a high minimum mask angle (1230a) of forty degrees. Each of the individual 840 spacecraft (S) functions as an independent sovereign switch of equal rank which knows the position of its neighbors, and independently handles traffic without ground control. The satellites (S) are capable of transporting calls to millions of customers using portable (P), mobile (M) and fixed (F) residential and business terminals, and gateways (G) to public phone networks. The constellation uses the 20 and 30 GHz frequency bands for communications between Earth and the constellation (C), and the 60 GHz band for communicating among the satellites (S). The present invention is designed to support in excess of 2,000,000 simultaneous connections, representing over 20,000,000 users at typical business usage levels, and over 350 billion minutes of use per year. Only a system such as the preferred embodiment, which utilizes 840 satellites at a preferred minimum mask angle of forty degrees, can accomplish these challenging objectives.

Satellite communication system

A system for acquiring the beacon of a satellite and synchronizing data transmission between the satellite and a ground terminal is disclosed. The ground terminal conducts a search for a satellite to be acquired. The search may be based on previously developed information from which the location of the satellite can be predicted and, thus, limited to a small area of the sky, or cover a large area of the sky in accordance with a search routine. After the beacon of a satellite is acquired, the geographic area served by the satellite is determined. If the satellite does not serve the cell within which the ground terminal is located, a further satellite search is conducted, which may be based in part on information contained in the beacon of the acquired satellite. After the satellite serving the cell containing the ground terminal is acquired, a test is made to determine how long the satellite will continue to cover the cell. If the time period is short, communication waits until the next satellite to cover the cell is acquired. If the time period is long, communication is allowed to begin. The beacon is also used by the ground terminal to: (i) accurately time uplink data transmissions; (ii) estimate uplink Doppler, Doppler rate, and Doppler rate derivative and use this information to pre-compensate the carrier frequency of the uplink data transmissions for Doppler variations; and (iii) estimate the carrier frequency of downlink data transmission(s) by continuously tracking the beacon carrier frequency and scaling the result by a suitable scaling factor.

Low-earth orbit satellite acquisition and synchronization system using a

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Encino, CA, United States of America

Mark Alan Sturza