Time division multiplex approach for multiple transmitter broadcasting
First Claim
1. A time division multiplex (TDM) communication system for broadcasting to a plurality of receivers, said TDM communication system comprising:
- a first satellite transmitter operable to broadcast a first signal into a first coverage area, said first transmitter allocated a first TDM time block having a first guard time; and
a second terrestrial transmitter operable to broadcast a second signal into a second coverage area which at least partially overlaps said first coverage area, said second transmitter allocated a second TDM time block having a second guard time, said first and second TDM time blocks forming at least a portion of a TDM repeat interval, said first and second guard times selected based upon signal time of arrival variations between said first and second transmitters, wherein said first transmitter broadcasts said first signal during said first TDM time block and said second transmitter broadcasts said second signal during said second TDM time block.
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Accused Products
Abstract
A time division multiplex (TDM) communication system (10) for broadcasting to users. The TDM communication system (10) includes a first transmitter (14) which broadcasts a first signal into a first coverage area (30) and a second transmitter (16) which broadcasts a second signal into a second coverage area (30) which at least partially overlaps said first coverage area (30). The first transmitter (14) is allocated a first TDM time block (88) having a first guard time (48) and the second transmitter (16) is allocated a second TDM time block (88) having a second guard time (48). The first (88) and second time blocks (88) form at least a portion of a TDM repeat interval such that the first transmitter (14) broadcasts the first signal during the first TDM time block (88) and the second transmitter (16) broadcasts the second signal during the second TDM time block (88).
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Citations
25 Claims
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1. A time division multiplex (TDM) communication system for broadcasting to a plurality of receivers, said TDM communication system comprising:
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a first satellite transmitter operable to broadcast a first signal into a first coverage area, said first transmitter allocated a first TDM time block having a first guard time; and
a second terrestrial transmitter operable to broadcast a second signal into a second coverage area which at least partially overlaps said first coverage area, said second transmitter allocated a second TDM time block having a second guard time, said first and second TDM time blocks forming at least a portion of a TDM repeat interval, said first and second guard times selected based upon signal time of arrival variations between said first and second transmitters, wherein said first transmitter broadcasts said first signal during said first TDM time block and said second transmitter broadcasts said second signal during said second TDM time block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A time division multiplex (TDM) communication system for broadcasting to a plurality of receivers, said TDM communication system comprising:
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at least a first satellite transmitter allocated a first TDM time block and a plurality of second terrestrial transmitters allocated a second TDM time block shared by said second plurality of terrestrial transmitters, said TDM time blocks from said transmitters forming a TDM repeat interval, each of said TDM time blocks including a guard time determined by time of arrival variations between said transmitters; and
a receiver within a coverage area operable to receive each of said signals from each of said transmitters during each of said TDM time blocks over said TDM repeat interval. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A time division multiplex (TDM) communication system for broadcasting to users, said TDM communication system comprising:
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a channel coding device having a plurality of first time multiplexers, each of said first time multiplexers operable to receive a plurality of channels and operable to time multiplex said plurality of channels into a TDM channel data stream;
a waveform generation device having a plurality of second time multiplexers, said plurality of second time multiplexers operable to time multiplex each of said TDM channel data streams between a plurality of transmitters, each of said transmitters being allocated a separate TDM time block forming a portion of a TDM repeat interval; and
a national system operation center and a local system operation center, said national system operation center housing a portion of said channel coding device and said waveform generation device and said local system operation center housing a portion of said channel coding device and said waveform generation device. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A time division multiplex (TDM) communication system for broadcasting to users, said TDM communication system comprising:
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a channel coding device having a plurality of first time multiplexers, each of said first time multiplexers operable to receive a plurality of channels and operable to time multiplex said plurality of channels into a TDM channel data stream;
a waveform generation device having a plurality of second time multiplexers, said plurality of second time multiplexers operable to time multiplex each of said TDM channel data streams between a plurality of transmitters, each of said transmitters being allocated a separate TDM time block forming a portion of a TDM repeat interval, wherein each of said transmitters broadcasts into at least a partially overlapping coverage area; and
a national system operation center and a local system operation center, said national system operation center housing a portion of said channel coding device and said waveform generation device and said local system operation center housing a portion of said channel coding device and said waveform generation device.
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Specification