Harold J Rosen

US Patent:

54736013, Dec 5, 1995

Filed:

Oct 21, 1993

Appl. No.:

8/142160

Inventors:

Harold A. Rosen - Washington DC
Victor S. Reinhardt - Rancho Palos Verdes CA
Andrew L. Strodtbeck - El Segundo CA
Jennifer L. Vollbrecht - Hermosa Beach CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04J 400

US Classification:

370 50

Abstract:

Frequency reuse and data coding methods for use in a high data rate satellite communication system. The frequency reuse method provides for dual polarization and spatial reuse of transmit and receive beams to provide for a twelve-fold increase in the effective bandwidth and number of users that may be supported by the system. Transmit and receive antennas provide multiple, interleaved transmit and receive antenna beams. Digital input data at a source user terminal is coded and transmitted from a source user terminal on one of the plurality of receive antenna beams. The received data is demodulated and is routed so that it may be transmitted to a destination user terminal. The data is then remodulated, multiplexed, and transmitted to the destination user terminal on one of the plurality of transmit beams. The transmitted data is decoded at the destination user terminal to produce the output data. The input and output data processed by the system is digital, and the coding (concatenated coding forward error correction processing) is employed to reduce the sensitivity of communicated data to interference.

US Patent:

56256248, Apr 29, 1997

Filed:

Oct 21, 1993

Appl. No.:

8/142524

Inventors:

Harold A. Rosen - Washington DC
Victor S. Reinhardt - Rancho Palos Verdes CA
Parthasarathy Ramanujam - Redondo Beach CA
Gregory C. Busche - Manhattan Beach CA
Andrew L. Strodtbeck - El Segundo CA
Jennifer L. Vollbrecht - Hermosa Beach CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04Q 1104

US Classification:

370307

Abstract:

A satellite-based communication system providing high rate transfer of data between linked terminals. The system comprises a plurality of user terminals (VSAT's) that are linked by and that communicate with each other by way of a satellite-based relay system. A network control center provides configuration signals that control the satellite relay system and coordinate linking of terminals to each other. Frequency division multiplexing uplinks are used from the terminals and the network control center to the satellite relay system. Time division multiplexing are used on downlinks from the satellite relay system to the terminals and the network control center. Each user terminal comprises a data compression and decompression circuit, a transceiver, and an antenna for transmitting and receiving data to and from the satellite relay system. The satellite relay system comprises a satellite, a wide area antenna, a plurality of receive antennas, a plurality of transmit antennas, and a signal processor. The wide area antenna is provided for communicating control signals between the user terminals and the network control center.