Accessing LP transponders with CP terminals via wavefront multiplexing techniques
First Claim
1. A satellite communication system comprising:
- a circularly-polarized (CP) terminal, at a receiving side of said satellite communication system, configured to concurrently receive data from a first terminal and a second terminal, at a transmitting side of said satellite communication system, through multiple linearly-polarized (LP) communication channels that are on a satellite and at a common frequency slot, wherein one of said linearly-polarized communication channels is configured to carry a first sum of a first signal, from said first terminal, weighted by a first parameter in a first weighting vector plus a second signal, from said second terminal, weighted by a second parameter in a second weighting vector and another one of said linearly-polarized communication channels is configured to carry a second sum of said first signal weighted by a third parameter in said first weighting vector plus said second signal weighted by a fourth parameter in said second weighting vector; and
a polarization-realignment element at a downstream side of said circularly-polarized (CP) terminal at said receiving side of said satellite communication system.
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Accused Products
Abstract
The invention is about a method and apparatus for grouping multiple satellite transponders with both (LP) polarization formats in different frequencies through Wave-Front (WF) Multiplexing (muxing) techniques for ground terminals with incompatible (CP) polarization formats. As a result of this invention, linear polarized (LP) transponders can be accessed and efficiently utilized by circularly polarized (CP) ground terminals and vice versa. This invention consists of conventional ground terminals, a unique organization of space assets, and a unique polarization alignment processor. The applications of wavefront multiplexing techniques to satellite communications offer many potential advantages, including improved flexibility and utility efficiency of existing space assets. Our proposed “Polarization Utility Waveforms” is an entirely new concept in VSAT and Earth Station Antenna diversity. The implementation enables antennas to switch between different polarization formats at the press of a button, and provides tele-port operators with greater flexibility in how they manage their assets.
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Citations
20 Claims
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1. A satellite communication system comprising:
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a circularly-polarized (CP) terminal, at a receiving side of said satellite communication system, configured to concurrently receive data from a first terminal and a second terminal, at a transmitting side of said satellite communication system, through multiple linearly-polarized (LP) communication channels that are on a satellite and at a common frequency slot, wherein one of said linearly-polarized communication channels is configured to carry a first sum of a first signal, from said first terminal, weighted by a first parameter in a first weighting vector plus a second signal, from said second terminal, weighted by a second parameter in a second weighting vector and another one of said linearly-polarized communication channels is configured to carry a second sum of said first signal weighted by a third parameter in said first weighting vector plus said second signal weighted by a fourth parameter in said second weighting vector; and a polarization-realignment element at a downstream side of said circularly-polarized (CP) terminal at said receiving side of said satellite communication system. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A satellite communication system comprising:
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a terminal, at a receiving side of said satellite communication system, configured to concurrently receive data from a first circularly-polarized (CP) terminal and a second circularly-polarized (CP) terminal, at a transmitting side of said satellite communication system, through multiple linearly-polarized (LP) communication channels that are on a satellite and at a common frequency slot, wherein one of said linearly-polarized communication channels is configured to carry a first sum of a first signal, from said first circularly-polarized (CP) terminal at said transmitting side of said satellite communication system, weighted by a first parameter in a first weighting vector plus a second signal, from said second circularly-polarized (CP) terminal at said transmitting side of said satellite communication system, weighted by a second parameter in a second weighting vector, and another one of said linearly-polarized communication channels is configured to carry a second sum of said first signal weighted by a third parameter in said first weighting vector plus said second signal weighted by a fourth parameter in said second weighting vector; and a polarization-realignment element at a downstream side of said terminal at said receiving side of said satellite communication system. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A satellite communication system comprising:
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a circularly-polarized (CP) terminal, at a transmitting side of said communication system, configured to concurrently transmit data to multiple terminals, at a receiving side of said communication system, through multiple linearly-polarized (LP) communication channels that are on a satellite and at a common frequency slot; and a polarization-realignment element at an upstream side of said circularly-polarized (CP) terminal at said transmitting side of said satellite communication system, wherein said polarization-realignment element is configured to have a first input and a second input, wherein one of said linearly-polarized communication channels is configured to carry a first sum of said first input weighted by a first parameter in a first weighting vector plus said second input weighted by a second parameter in a second weighting vector, and another one of said linearly-polarized communication channels is configured to carry a second sum of said first input weighted by a third parameter in said first weighting vector plus said second input weighted by a fourth parameter in said second weighting vector. - View Dependent Claims (14, 15, 16, 17)
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18. A satellite communication system comprising:
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a terminal, at a transmitting side of said satellite communication system, configured to concurrently transmit data to multiple circularly-polarized (CP) terminals, at a receiving side of said communication system, through multiple linearly-polarized (LP) communication channels that are on a satellite and at a common frequency slot; and a polarization-realignment element at an upstream side of said terminal at said transmitting side of said satellite communication system, wherein said polarization-realignment element is configured to have a first input and a second input, wherein one of said linearly-polarized communication channels is configured to carry a first sum of said first input weighted by a first parameter in a first weighting vector plus said second input weighted by a second parameter in a second weighting vector and another one of said linearly-polarized communication channels is configured to carry a second sum of said first input weighted by a third parameter in said first weighting vector plus said second input weighted by a fourth parameter in said second weighting vector. - View Dependent Claims (19, 20)
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Specification