Method and apparatus for combining transponders on multiple satellites into virtual channels

• US 7,039,119 B2
• Filed: 10/08/2002
• Issued: 05/02/2006
• Est. Priority Date: 02/04/1998
• Status: Expired due to Fees

• Current Assignee: Virlite Communication LLC (Intellectual Ventures LLC)
• Original Assignee: Virtual Satellite Corporation
• Inventors: Friedman, Robert F.
• Primary Examiner(s): Bocure, Tesfaldet
• Application Number:
  US10/267,602
• Publication Number:
  US 20030031265A1
• Time in Patent Office: 1,302 Days
• Field of Search: 375/260, 375/211, 375/267, 375/295, 375/316, 375/299, 375/347, 455 131- 133, 455/12, 455/61, 455/59, 455/101, 455/132, 455/137, 455/139, 370/480, 370/315, 370/316, 370/326
• US Class Current: 375/260
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/18515 Transmission equipment in satellites or space-based relays

Abstract

A satellite communications system provides an information channel between remotely located transmitters and receivers. A virtual satellite system provides the same service, but divides the signal either in power or in data content into subchannels such that any particular signal is conducted to the intended receiver via a plurality of traditional satellite channels. The receiving terminal accepts the plurality of signals simultaneously from a possible plurality of satellites, combining the subchannels comprising the virtual channel into the original signal content as if conducted via a single channel. The receiving antenna system receives satellite subchannel signals from a plurality of directions using multiple antennas or a single antenna with multi-direction capability. Prior to signal combining, the receiver necessarily time-synchronizes the plurality of subchannels by introducing time delay in some channels before combining the subsignals into the original composite. A timing signal present in the virtual satellite system assists the receiver in determining the amount of delay to apply to each incoming signal. The timing signal is either a separate carrier or an additional modulation on the existing information-bearing carrier.

Claims

1. A method for transmitting data to a receiving station over at least one satellite transponder, the method comprising:

dividing an original signal having a first bandwidth into a plurality of subchannels, each subchannel having a bandwidth smaller than the first bandwidth and including a unique information;

adding a synchronization signal to each subchannel so that the plurality of subchannels are synchronized and combined to recreate the original signal after being transmitted through the satellite transponder;

and

adding a propagation delay indicator to each of the subchannels, the propagation delay indicator allowing the unique information in the plurality of subchannels to be synchronized before being combined into a reconstructed version of the original signal.

2. The method of claim 1 further comprising adding the synchronization signal so that the synchronization signal is within the bandwidth of each subchannel and no additional bandwidth allocation is required.

3. The method of claim 1 further comprising adding the synchronization signal on a separate frequency allocation.

4. The method of claim 1 further comprising associating each subchannel with a unique amount of propagation delay.

5. The method of claim 1 wherein the original signal and the subchannels are analog signals.

6. A method for transmitting data to a receiving station over at least one satellite transponder, the method comprising:

dividing an original signal having a first bit rate into a plurality of subchannels, each subchannel carrying information at the same bit rate as the first bit rate and including a unique information;

adding a synchronization signal to each subchannel so that the plurality of subchannels are synchronized and combined to recreate the original signal after being transmitted through the satellite transponder; and

adding a propagation delay indicator to each subchannel, the propagation delay indicator allowing the unique information in the plurality of subchannels to be synchronized before being combined into a reconstructed version of the original signal.

7. The method of claim 6 wherein the synchronization signal is added to the plurality of subchannels within the bandwidth of each subchannel so that no additional bandwidth allocation is required.

8. The method of claim 6 further comprising associating each subchannel with a unique amount of propagation delay.

9. A plurality of subchannels for communication, each of the plurality of subchannels comprising:

a subchannel bandwidth smaller than a bandwidth of an original signal that was divided into the plurality of subchannels;

a unique information within the subchannel bandwidth, wherein combination of the unique information in each of the subchannels is substantially equal to an information in the original signal;

a common timing signal within the subchannel bandwidth, the common timing signal allowing the plurality of subchannels to be properly combined into a reconstructed version of the original signal after the subchannels are transmitted via at least one satellite transponder; and

a propagation delay indicator within the bandwidth of each subchannel, the propagation delay indicator allowing the unique information in the plurality of subchannels to be synchronized before being combined into the reconstructed version of the original signal.

10. The plurality of subchannels of claim 9, wherein the unique information and the synchronization signal are carried within a single frequency range allocation.

11. A plurality of electrical subsignals for communication, wherein an electrical signal having a first bandwidth is divided into the plurality of electrical subsignals for transmission over a plurality of communication channels, wherein the plurality of electrical subsignals are embodied in a carrier wave, and each of the plurality of electrical subsignals has a bandwidth smaller than the first bandwidth, the plurality of electrical subsignals further comprising some information unique to that subsignal so that the plurality of electrical subsignals are identifiable and distinguishable, wherein a synchronization signal is added to the plurality of electrical subsignals within the bandwidth of each subsignal so that no additional bandwidth allocation is required to transmit the synchronization signal, the plurality of tuners receiving the synchronization signal to measure relative propagation delays of the subsignals, the amount of delay in the plurality of delay means is set, and the plurality of tuners are redirected to receive the associated information-bearing subsignals;

whereby the plurality of electrical subsignals are received, synchronized, and combined for re-creating the electrical signal.

12. The claim of 11, wherein the plurality of tuners receive the synchronization signal without employing a coded chip.

13. A plurality of electrical subsignals for communication, wherein an electrical signal having a first bit rate is divided into the plurality of electrical subsignals for transmission over a plurality of communication channels, wherein the plurality of electrical subsignals are embodied in a carrier wave, and each of the plurality of electrical subsignals carries identical information at the same bit rate as the first bit rate, the plurality of electrical subsignals comprises some information unique to that subsignal so that the plurality of electrical subsignals are identifiable and distinguishable wherein a synchronization signal is added to the plurality of electrical subsignals within the bandwidth of each subsignal so that no additional bandwidth allocation is required to transmit the synchronization signal and wherein a plurality of tuners receive the synchronization signal to measure relative propagation delays of the subsignals, the amount of delay in a plurality of delay means is set, and the plurality of tuners are redirected to receive the associated information-bearing subchannels;

whereby the plurality of electrical subsignals are received and combined for re-creating the electrical signal.

14. The claim of 13, wherein the synchronization signal is added to the plurality of electrical subsignals without employing a coded chip.

16. The claim of 14, wherein the synchronization signal is transmitted without employing a coded chip.

15. A plurality of analog subsignals for communication, wherein an analog signal having a first power is divided into the plurality of analog subsignals for transmission over a plurality of communication channels, wherein the plurality of analog subsignals are embodied in a carrier wave, and each of the plurality of analog subsignals has a power smaller than the first power, wherein a synchronization signal is added to the plurality of analog subsignals within the bandwidth of each subsignal so that no additional bandwidth allocation is required to transmit the synchronization signal, wherein a plurality of tuners receive the synchronization signal to measure relative propagation delays of the subsignals, the amount of delay in a plurality of delay means is set, and the plurality of tuners are redirected to receive the associated information-bearing subsignals;

and

whereby the plurality of analog subsignals are received, synchronized, and combined for reconstruction of the analog signal.

17. A satellite communication system comprising:

a transmitting station receiving an original signal, dividing the original signal into a plurality of subchannels to be transmitted over at least one satellite transponder, and adding a synchronization signal and propagation delay indicators to the plurality of subchannels wherein the synchronization signal allows the plurality of subchannels to be combined into a reconstructed original signal and the propagation delay indicators allow the plurality of subchannels to be properly combined into a reconstructed version of the original signal; and

a receiving station receiving the plurality of subchannels from the at least one satellite transponder and combining the subchannels according to the synchronization signal and the propagation delay indicators to reconstruct the original signal.

18. A satellite communication system comprising:

a transmitting station receiving an original signal, dividing the original signal into a plurality of subchannels to be transmitted over at least one satellite transponder, and adding a common timing signal to the plurality of subchannels wherein the common timing signal allows the plurality of subchannels to be combined into a reconstructed original signal wherein each of the plurality of subchannels is associated with a unique amount of propagation delay; and

a receiving station receiving the plurality of subchannels from the at least one satellite transponder and combining the subchannels according to the common timing signal to reconstruct the original signal, the receiving station further comprising a subchannel synchronization component that delays subchannels by a predetermined amount based on order of arrival.