초록 ▼

A message communication system employing one or more centralized communication stations transmitting messages through Earth orbit relay satellites to mobile receivers utilizing Time Division Multiplexed (TDM) communication signals having signal time frames divided into a series of transmission chann

A message communication system employing one or more centralized communication stations transmitting messages through Earth orbit relay satellites to mobile receivers utilizing Time Division Multiplexed (TDM) communication signals having signal time frames divided into a series of transmission channels. A predetermined number of the channels are designated as address channels with the remainder being used for data transfer. Information transmitted on the address channels is used by receivers to determine both the presence of a message and its corresponding data transmission channel. Each system receiver scans, and tracks only the communication signal address channels until a message addressed to that receiver is detected, at which time the selected receiver changes channels to the designated data channel for reception of the message. Thus, demodulation of the entire communication signal is not required and processing time and power is reduced for the typical waiting condition when messages are not being received. While a message is being received only a portion of the communication signal need to be received, demodulated and decoded. The decoded message is then displayed on a display screen or similar device for the recipient.

대표청구항 ▼

A communication system for sending messages from central communication stations to one or more of a plurality of mobile receivers through Earth orbital relay stations using Time Division Multiplexed communication signals, comprising: at least one central communication station having transmission mea

A communication system for sending messages from central communication stations to one or more of a plurality of mobile receivers through Earth orbital relay stations using Time Division Multiplexed communication signals, comprising: at least one central communication station having transmission means for transmitting a TDM communication signal which comprises a series of N channels, with D data channels, for D