Digital carrierless amplitude and phase modulation (CAP) transmitter using vector arithmetic structure (VAS)
First Claim
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1. An encoder, comprising:
- a constellation generator, responsive to an input bitstream to produce an impulse comprising an in-phase component and a quadrature component, said impulse defining symbols within a constellation of symbols;
a pair of vector arithmetic structures (VAS), each VAS adapting a respective one of said in-phase and quadrature components to produce respective shaped in-phase and quadrature components; and
a combiner, for combining said shaped in-phase and quadrature components to produce an encoded bitstream.
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Abstract
A method and apparatus for carrierless amplitude and phase CAP encoding of data in a manner avoiding the use of pulse shaping filters for in-phase and quadrature impulse signals. Specifically, in-phase and quadrature vector arithmetic structures (VAS) to adapt respective in-phase and quadrature impulse components to produce appropriate shaped in-phase and quadrature components.
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Citations
16 Claims
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1. An encoder, comprising:
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a constellation generator, responsive to an input bitstream to produce an impulse comprising an in-phase component and a quadrature component, said impulse defining symbols within a constellation of symbols;
a pair of vector arithmetic structures (VAS), each VAS adapting a respective one of said in-phase and quadrature components to produce respective shaped in-phase and quadrature components; and
a combiner, for combining said shaped in-phase and quadrature components to produce an encoded bitstream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A encoding method, comprising:
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processing an input bitstream to produce an impulse defining symbols within a constellation of symbols; and
shaping, using a vector arithmetic structure (VAS), said component to produce a shaped component. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification