Robert C Marquart

US Patent:

57909407, Aug 4, 1998

Filed:

Jul 18, 1997

Appl. No.:

8/896337

Inventors:

Enrique Laborde - Gaithersburg MD
James Eryx Malcolm - Bethesda MD
Robert Carroll Marquart - Germantown MD
Adrian Morris - Gaithersburg MD

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04B 100
H04B 700

US Classification:

455 69

Abstract:

A method and system for adjusting the transmission power of a transmitter during a communication with a receiver in a mobile satellite communication system is disclosed herein. The method comprises establishing at least one threshold signal strength value for a transmitted burst; measuring the received signal strength of the burst received by the receiver; comparing the received signal strength with the threshold value; and setting a power control bit based on the comparison. The system comprises a plurality of mobile terminals having a first stored threshold value; a satellite adapted to communicate with each of the mobile terminals; at least one gateway in communication with the satellite, the gateway having a second stored threshold value, and including a routine for measuring the received signal strength of a burst signal transmitted from the mobile terminal, for comparing the received signal strength with the second stored threshold value, and for adjusting the transmission power of the gateway based on the comparison; and each of the mobile terminals including a routine for measuring the received signal strength of a burst signal transmitted from the gateway to the mobile terminals, for comparing the received signal strength with the first stored threshold value, and for adjusting the transmission power of the mobile terminal based on the comparison.

US Patent:

57109826, Jan 20, 1998

Filed:

Jun 29, 1995

Appl. No.:

8/496633

Inventors:

Enrique Laborde - Gaithersburg MD
James Eryx Malcolm - Bethesda MD
Robert Carroll Marquart - Germantown MD
Adrian Morris - Gaithersburg MD

Assignee:

Hughes Electronics - Los Angeles CA

International Classification:

H04B 100
H04B 700

US Classification:

455 69

Abstract:

A method and system for adjusting the transmission power of a transmitter during a communication with a receiver in a mobile satellite communication system is disclosed herein. The method comprises establishing at least one threshold signal strength value for a transmitted burst; measuring the received signal strength of the burst received by the receiver; comparing the received signal strength with the threshold value; and setting a power control bit based on the comparison. The system comprises a plurality of mobile terminals having a first stored threshold value; a satellite adapted to communicate with each of the mobile terminals; at least one gateway in communication with the satellite, the gateway having a second stored threshold value, and including a routine for measuring the received signal strength of a burst signal transmitted from the mobile terminal, for comparing the received signal strength with the second stored threshold value, and for adjusting the transmission power of the gateway based on the comparison; and each of the mobile terminals including a routine for measuring the received signal strength of a burst signal transmitted from the gateway to the mobile terminals, for comparing the received signal strength with the first stored threshold value, and for adjusting the transmission power of the mobile terminal based on the comparison.

US Patent:

57815402, Jul 14, 1998

Filed:

Jun 30, 1995

Appl. No.:

8/497582

Inventors:

James Eryx Malcolm - Bethesda MD
Daniel Fraley - Germantown MD
Adrian Morris - Gaithersburg MD
David Roos - Boyds MD
Kumar Swaminathan - North Potomac MD
Seok Ho Kim - North Potomac MD
Robert Carroll Marquart - Germantown MD

Assignee:

Hughes Electronics - Los Angeles CA

International Classification:

H04B 7212

US Classification:

370321

Abstract:

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.

US Patent:

57909393, Aug 4, 1998

Filed:

Jun 29, 1995

Appl. No.:

8/496737

Inventors:

James Eryx Malcolm - Bethesda MD
Robert Carroll Marquart - Germantown MD

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

H04B 719

US Classification:

455 132

Abstract:

A method and system for synchronizing transmission TDMA frames in a mobile satellite communication system are disclosed herein. The method of synchronizing a transmitted frame timing in a mobile satellite communication system comprises the steps of broadcasting a frame timing offset from a satellite to a mobile terminal having a timer, receiving the frame timing offset information transmitted by the satellite in the mobile terminal, and adjusting the timer in the mobile terminal based on the timing offset information. The system includes a plurality of mobile terminals; a satellite adapted to communicate with each of the mobile terminals, the satellite having a satellite reference frame timing; at least one gateway in communication with the satellite, the gateway having a digital processor, the digital processor including a routine for calculating a frame timing offset; with the gateway transmitting the timing offset to at least one of the mobile terminals, the at least one mobile terminal receiving the timing offset and adjusting the mobile terminal transmit frame timing to compensate for the timing offset.