초록 ▼

A message communication system employing one or more centralized communication stations transferring messages through Earth orbit repeater satellites to or from mobile terminals with at least one central communication station having a first transceiver for transmitting a first communication signal t

A message communication system employing one or more centralized communication stations transferring messages through Earth orbit repeater satellites to or from mobile terminals with at least one central communication station having a first transceiver for transmitting a first communication signal to one or more mobile terminals and at least one mobile terminal having a second transceiver for receiving the first communication signal and demodulating it, and for transmitting at a predetermined duty cycle of the second transceiver, a second communication signal to at least one of the central communication stations. The preferred duty cycle over which the second communication signal is transmitted is about fifty percent of the second transceiver duty cycle. The communication system uses Time Division Multiplexed (TDM) communication signals using a number of channels as designated address channels with the remainder being used for data transfer. Information transmitted on the address channels is used by terminals to determine both the presence of a message and its corresponding data transmission or reception channel. In addition the terminals use the reception of the first communication signal to adjust return link transmission frequency to compensate for transmission path errors. The alternating duty cycle allows mobile terminals to use a single set of local oscillators for both transmission and reception modes of operation. To decrease interference with other systems the present system employs a power dispersal modulation function to achieve the footprint of a video signal for high transfer rate digital communication signals.

대표청구항 ▼

A communication system for transferring messages between central communication stations and one or more of a plurality of mobile terminals through Earth orbital relay satellites, comprising: at least one central communication station having first transceiver means for transmitting a first communicat

A communication system for transferring messages between central communication stations and one or more of a plurality of mobile terminals through Earth orbital relay satellites, comprising: at least one central communication station having first transceiver means for transmitting a first communication signal in the form of Time Division Multiplexed communication signals, which comprise a series of N channels which are separated into A address channels and D data channel; said central communication station further comprising: receiver assignment means for detecting which of said plurality of mobile terminals each message is directed to; channel assignment means for assigning at least one channel to each of said messages at a time from said D channels; address control means for transferring a terminal address and an associated channel assignment onto one of said A channels in response to input messages intended for a corresponding terminal; and message input means connected to said channel assignment means for receiving digital messages and transferring said messages onto said D channels in response to an assignment from said channel assignment means; and at least one mobile terminal having second transceiver means for receiving and demodulating said first communication signal, and for transmitting at a predetermined transmit duty cycle, second communication signals to at least one of said central communication stations.