Hughes Network Systems, LLC

Hughes Electronics Corporation

Victor Liau

Lin-Nan Lee

Mustafa Eroz

Tayyab Khan

Kalyan Ganesan

Ranjan Pant

Harry M Johnson

Peter Hou

Liping Chen

Lin-nan Lee

Desmond Coughlin

Glenn Robins

Chi-Jiun Su

Kim Goh

Mustafa Rangwala

Robert Fischler

Sarah Xie

Barry Saunders

Desmond Coghlan

A hybrid scanning antenna including: a reflector having a focal line; a first mechanical movement to move the reflector about a first axis; a second mechanical movement to move the reflector about a second axis; a linear array fixedly disposed along the focal line to electronically scan at a scan angle about a third axis; and a controller to control the first mechanical movement, the second mechanical movement and the scan angle of the linear array to orient the hybrid scanning antenna to a look angle of a remote transceiver.

Hybrid scanning antenna

Communication terminals, systems and methods are disclosed herein. In an embodiment, a method for improving communication throughput when experiencing periodic blockages includes generating at least one outer code block including a plurality of sync data elements, writing the sync data elements from the at least one outer code block to a same column of at least one interleaver including a plurality of rows and a plurality of columns, and writing additional data elements from the outer code block to other columns of the at least one interleaver.

Systems and methods for improving communication throughput

A system and method for recovering from communication interruptions by a periodic blockage. This is achieved by selecting an inner code block rate that supports a Packet Error Ratio (PER) equal to or greater than a target PER during the blockage. An expected number of erasures is estimated and an outer code block rate capable of correcting an erasure ratio is chosen. The input is encoded using the outer code block rate to form an outer code block. One or more inner code blocks are formed by encoding segments of the outer code block using the inner code block rate. These inner code blocks are then transmitted. The count of inner code blocks is greater than 1, and the PER is a ratio of the expected number of erasures to the count of inner code blocks.

Using erasure coding on partial code block communication interruption

A satellite communication system that combines the benefits of Geosynchronous Equatorial Orbit (GEO) and Non-geostationary (NGSO) satellite systems into a GEO-NGSO hybrid satellite system. The hybrid system allows for various uses, such as, a NGSO-GEO-NGSO handoff, a GEO-NGSO-GEO handoff, and/or a multi-transport operation utilizing both the GEO and NGSO satellites. Based on the path delay differences of the GEO and NGSO satellites, the system may create a data buffer to ensure no data loss.

Non-geostationary orbit (NGSO) and geostationary orbit (GEO) hybrid network for uninterrupted communications

Methods, systems, and apparatus, including computer programs encoded on computer-storage media, for improving communication throughput despite periodic blockages. In some implementations, a method includes receiving, by a receiver and from a transmitter, code blocks transmitted according to a first set of communication parameters that includes one or more first interleaver parameters used to interleave information in the code blocks prior to transmission. Corrupted portions of at least some of the received code blocks are identified. A blockage duration and a blockage interval of a blockage of communication channel between the transmitter and the receiver are determined based on the corrupted portions of the received code blocks. A second set of communication parameters that includes one or more second interleaver parameters are determined based on the blockage duration and blockage interval. The second set of communication parameters are communicated to the transmitter for subsequent transmissions by the transmitter to the receiver.

Communication throughput despite periodic blockages

A system and method for tracking non-geo synchronous orbit satellites on orbiting planes of regular motion patterns. The method includes providing a first satellites moving in a direction descending in latitude in first orbital planes and a second satellites moving in a direction ascending in latitude in second orbital planes; steering an antenna to an antenna tilt φ from normal with a single axis mechanism lined up with a first axis; scanning, electronically, with a linear array at a scan angle ψ along a second axis; and locking to a signal from a handed-from satellite from the first satellites, where the first axis is angled from the second axis, the steering along the first axis and the scanning along the second axis jointly track the handed-from satellite, the first orbits seem parallel, the second orbits seem parallel, and the first orbits seem aligned with the antenna tilt φ. A handoff between the first satellites may use one of the second satellites as a steppingstone.

Tracking Non-Geo Synchronous Orbit satellites on orbiting planes of regular motion patterns

Communication terminals, systems and methods are disclosed herein. In an embodiment, a method for improving communication throughput when experiencing periodic blockages includes reading a plurality of data elements into an interleaver in one of a quasi-reverse order and a consecutive order, reading the plurality of data elements out of the interleaver in the other of the quasi-reverse order and the consecutive order, and. transmitting the plurality of data elements via a communication channel that experiences periodic blockages.

Methods, systems, and apparatus, including computer programs encoded on computer-storage media, for determining a set of communication parameters for receiving data transmissions. In some implementations, a method includes receiving a first data transmission sent according to a first communication parameter scheme that includes at least one of a first modulation or a first coding. A second data transmission is received. A second communication parameter scheme of the second transmission is determined. This determination includes identifying a subset of multiple candidate communication parameter schemes determined based on the first communication parameter scheme, identifying, in the second data transmission, a first identifier that corresponds to the second communication parameter scheme, comparing the first identifier to a respective identifier for each communication parameter scheme in the subset, and determining, as the second communication parameter scheme, a communication parameter scheme in the subset that has an identifier that matches the first identifier.

Efficient adaptive coding and modulation

A communications terminal comprises an encoder configured to encode a digital data signal to generate an encoded signal, a scrambler configured to scramble the encoded signal based on a scrambling signature, and a modulator configured to modulate resulting data frames for transmission via a random access communications channel. Each frame comprises a data payload, including a block of the scrambled signal, and a header, including a start of frame (SOF) sequence associated with the scrambling signature. Use of the SOF sequence for each frame provides a synchronization reference and serves to designate the associated scrambling signature for decoding the respective data payload. Use of the SOF sequence for each frame further serves to distinguish between the data frame and data frame(s) originating from further communications terminal(s), transmitted via a common time slot of the channel, for which different scrambling signature(s) were used to scramble respective encoded signal(s) thereof.

Unique word (UW) based multiple access signal acquisition technique

A communications terminal receives a data communications signal via a random access channel. A processor searches for data bursts in a first time-slot that include one of a first set of signature sequences assigned to the first time-slot. When a data burst A in the first time-slot includes one of the first set of signature sequences, the data burst A in the first time-slot is an initial burst of a message from a first communications terminal. The processor determines whether a second time-slot includes a data burst B that includes the one signature sequence. When the second time-slot includes the data burst B, the message is a multi-burst message and that the data burst B is a second burst of the multi-burst message. When the second time-slot does not include the data burst B the message is a single-burst message that has been completed via the first time-slot.

Unique word (UW) based multiple access message processing

The present invention relates to a wireless personal communications system (WPCS) having several features embodied in several forms. In one embodiment, the, WPCS includes at least one RP, a first SU in communication with the RP, and a second SU in communication with the first SU through the RP without involving the RPC in the manner contemplated by the specification. The RP may preferably include a channel switching unit for connecting the first SU with the second SU without using any tariff lines to or from an RPC. Such an RP may be used as a component in a wireless PBX or Centrex system including ISDN based systems. Another preferred embodiment provides for a walkie-talkie option where the first SU communicates directly with the second SU, preferably over an unlicensed frequency. In another preferred embodiment, a plurality of SUs in communication with an RP may be accessed individually using a single dialed number.

Wireless personal communication system

The present invention relates to a subscriber unit in a wireless personal communications system (WPCS). In one embodiment, the subscriber unit includes a digital dataport for modemless communication of digital signals. Another preferred embodiment provides for a subscriber unit having a cable television transport module for modulating and demodulating signals over unused bandwidth available on cable television lines.

Subscriber unit in a wireless personal communication system

The present invention relates to a radio port in a wireless personal communications system. The radio port includes a first channel in communication with a first subscriber unit, a second channel in communication with a second subscriber unit, and a switching device connecting the first channel to the second channel so that the first subscriber unit may communicate directly with the second subscriber unit. In another preferred embodiment, the radio port includes a plurality of antennas, an RF receive section, an RF transmit section, an analog port adapted for connection to an analog telephone line, a digital dataport for receiving and transmitting digital signals, and a databus interconnecting the RF receive section, RF transmit section, analog port, and digital dataport. The RF receive section includes a diversity selection unit receiving an input signal from each of the antennas. The RF transmit section generates an output signal to be transmitted over at least one of the antennas.

Growing community of inventors

Gaithersburg, MD, United States of America

Victor Liau