Systems and methods for creating in a transmitter a stream of symbol frames configured for efficient processing in a reciever
AssigneeViaSat, Inc.
InventorsMURAT ARABACI, FAN MO, SAMEEP DAVE, WILLIAM H. MILLER
Life of this patent
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Abstract
A system and method of creating frames comprised of blocks, where each block comprises data symbols corresponding to a higher order quadrature modulation format and support symbols corresponding to a lower order modulation format. One or more of the blocks can further comprise markers comprising distinct symbol patterns. The markers can mark the start of each frame and/or another location in the frame. The support symbols can be in a common location in each block.
Claims24
A method of generating, in a communications transmitter, a stream of symbol blocks each comprising a first region and a second region, the method comprising:
- providing in the first region of a first of the symbol blocks a distinct symbol pattern identifying a start of a frame of the symbol blocks and a first set of data symbols comprising a first set of user bits modulated in accordance with a first quadrature modulation format;
- providing in the second region of the first of the symbol blocks a first set of support symbols comprising a second set of the user bits modulated in accordance with a second quadrature modulation format;
- providing in the first region of a second of the symbol blocks a second set of the data symbols comprising a third set of the user bits modulated in accordance with the first quadrature modulation format;
- providing in the second region of the second of the symbol blocks a second set of the support symbols comprising a fourth set of the user bits modulated in accordance with the second quadrature modulation format;
- and
- outputting the first of the symbol blocks and the second of the symbol blocks for transmission to a remote receiver,
- wherein the first quadrature modulation format is of a higher order than the second quadrature modulation format.
A system configured to output a frame of symbol blocks each comprising a first region and a second region, the frame to be transmitted in a signal to a remote receiver, the system comprising:
- a framer input configured to receive user bits;
- and
- a symbol generator configured to provide:
- a distinct symbol pattern identifying a start of a frame of the symbol blocks and a first set of data symbols comprising a first set of user bits modulated in accordance with a first quadrature modulation format in the first region of a first of the symbol blocks,
- a first set of support symbols comprising a second set of the user bits modulated in accordance with a second quadrature modulation format in the second region of the first of the symbol blocks, the first quadrature modulation format being of a higher order than the second quadrature modulation format, a second set of the data symbols comprising a third set of the user bits modulated in accordance with the first quadrature modulation format in the first region of a second of the symbol blocks, and
- a second set of the support symbols comprising a fourth set of the user bits modulated in accordance with the second quadrature modulation format in the second region of the second of the symbol blocks.
Dependencies are inferred from the claim text.