Patent
Spread spectrum multiple access communication using satellite or terrestrial repeaters
TLDR
In this article, a multiple access, spread spectrum communication system and method for providing high capacity communications to, from, or between a plurality of system users, using code-division-spread-spectrum communication signals is presented.Abstract:
A multiple access, spread spectrum communication system and method for providing high capacity communications to, from, or between a plurality of system users, using code-division-spread-spectrum communication signals. The communication system uses means for providing marginal isolation between user communication signals. The marginal isolation is provided by generating simultaneous multiple steerable beams; using an omni-directional antenna with polarization enhancement; using power control devices to adjust the output power for user generated communication signals either in response to their input activity level, or in accordance with a minimum allowable power for maintaining a communication link. The communication system can also employ a means for transmitting a predetermined pilot chip sequence contiguous with the code-division-spread-spectrum communication signals. In further embodiments the communication system employs a plurality of user terminals linked to each other or to other services through one or more terrestrial or satellite repeaters. Multiple satellite repeaters are operable in a new communication mode to obtain further gains in signal isolation.read more
Citations
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References
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Journal ArticleDOI
Advances in packet ratio technology
TL;DR: Various aspects of spread spectrum transmission in the network environment are identified and the experience with a testbed network in the San Francisco Bay area is discussed.
Journal ArticleDOI
A spread-spectrum technique for high-capacity mobile communications
George R. Cooper,R.W. Nettleton +1 more
TL;DR: The spectral efficiency of the spread-spectrum scheme may exceed those of the narrow-band schemes by a factor of almost five, and more ambitious bit-rate-reducing speech digitization methods could improve still further on these figures.
Patent
Spread spectrum apparatus for cellular mobile communication systems
TL;DR: In this paper, the available frequency spectrum is divided such that one-half is used for mobile-to-base station transmission and the other one half for base station-tomobile unit transmission.
Patent
Satellite-based vehicle position determining system
TL;DR: In this paper, a system for determining the positions of a plurality of vehicles traveling on or above a defined sector of the earth's surface comprises a transponder carried by each vehicle for transmitting a uniquely coded beacon signal in response to a general interrogation signal, at least three repeater-carrying satellites at spaced orbital locations above the earth for receiving and retransmitting the beacon signals produced by the vehicles, and a ground station for periodically transmitting the general interrogations and receiving and processing the beacons retransmitted by the three satellites in order to determine vehicle position.
Patent
Satellite communications system and apparatus
TL;DR: In this article, a satellite communications system employing spread spectrum techniques in order to trade-off bandwidth for small ground station antennas is presented, where a central station transmits data to a satellite for relay to a large number of small antenna receiving stations, the transmissions being spread spectrum encoded with spreading code lengths selected to provide adequate data recovery at the least sensitive station to which the transmissions are directed.