Digital radio satellite and terrestrial ubiquitous broadcasting system using spread spectrum modulation
First Claim
1. A system for broadcasting radio signals in one transmission channel, said radio signals having frequencies in the range of about 300 MHZ to about 3,000 MHZ, said system comprising a first transmitter located at or near the earth'"'"'s surface, one or more repeaters located on one or more geo-synchronous satellites for transmitting said radio signals directly to a plurality of fixed and mobile receivers for said radio signals, said plurality of receivers being located at or near the earth'"'"'s surface, and at least one repeater located at or near the earth'"'"'s surface, said at least one repeater including means for receiving said radio signals from said one or more repeater located on one or more geo-synchronous satellites and retransmitting said radio signals directly to said plurality of receivers, said first transmitter including a spread spectrum encoder that modulates said radio signals with a first spread spectrum code, said at least one repeater including a spread spectrum encoder that modulates said radio signals with another spread spectrum code, whereby said receivers can distinguish the radio signals from said one or more repeater located on one or more geo-synchronous satellites from radio signals from said at least one repeater and whereby said system can provide ubiquitous broadcast service to said receivers over a large geographical area.
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Accused Products
Abstract
A digital radio broadcasting system using spread spectrum modulation transmitted from both geosynchronous satellites and terrestrial repeater stations provides multi-program audio services to mobile and fixed user receivers over a large geographical area in an ubiquitous manner.
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Citations
20 Claims
- 1. A system for broadcasting radio signals in one transmission channel, said radio signals having frequencies in the range of about 300 MHZ to about 3,000 MHZ, said system comprising a first transmitter located at or near the earth'"'"'s surface, one or more repeaters located on one or more geo-synchronous satellites for transmitting said radio signals directly to a plurality of fixed and mobile receivers for said radio signals, said plurality of receivers being located at or near the earth'"'"'s surface, and at least one repeater located at or near the earth'"'"'s surface, said at least one repeater including means for receiving said radio signals from said one or more repeater located on one or more geo-synchronous satellites and retransmitting said radio signals directly to said plurality of receivers, said first transmitter including a spread spectrum encoder that modulates said radio signals with a first spread spectrum code, said at least one repeater including a spread spectrum encoder that modulates said radio signals with another spread spectrum code, whereby said receivers can distinguish the radio signals from said one or more repeater located on one or more geo-synchronous satellites from radio signals from said at least one repeater and whereby said system can provide ubiquitous broadcast service to said receivers over a large geographical area.
Specification