METHOD AND APPARATUS FOR IMPLEMENTING HIGH-ORDER MODULATION SCHEMES USING LOW-ORDER MODULATORS
First Claim
1. A processing device comprising:
- a plurality of modulators, the plurality of modulators each performing modulation according to a same first modulation scheme;
a combiner configured to combine outputs from the plurality of modulators and to produce a modulated output based on the combined outputs of the plurality of modulators; and
a signal processor configured to receive a bit stream, convert the bit stream into a plurality of input signals for the plurality of modulators, and to provide the plurality of input signals to the plurality of modulators in such a manner that the combiner generates the modulated output according to a second modulation scheme.
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Accused Products
Abstract
A processing device includes a plurality of modulators, the plurality of modulators performing modulation according to a first modulation scheme, a combiner configured to combine outputs from the plurality of modulators, and a signal processor configured to receive a bit stream and convert the bit stream into a plurality of input signals for the plurality of modulators such that the combiner generates a modulated output according to a second modulation scheme. The plurality of modulators may be low order modulators and a modulation schemes of the modulated output may include, for example, rotated quadrature phase shift keying (QPSK), pulse amplitude modulation (PAM), high order quadrature amplitude modulation (QAM), and multi-resolution high order quadrature amplitude modulation (M-QAM).
9 Citations
31 Claims
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1. A processing device comprising:
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a plurality of modulators, the plurality of modulators each performing modulation according to a same first modulation scheme; a combiner configured to combine outputs from the plurality of modulators and to produce a modulated output based on the combined outputs of the plurality of modulators; and a signal processor configured to receive a bit stream, convert the bit stream into a plurality of input signals for the plurality of modulators, and to provide the plurality of input signals to the plurality of modulators in such a manner that the combiner generates the modulated output according to a second modulation scheme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of modulating a bit stream, the method comprising:
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converting the bit stream into a plurality of input signals; providing the plurality of input signals to a plurality of modulators, each of the plurality of modulators performing modulation according to a same first modulation scheme, generating outputs from the plurality of modulators, and combining the outputs from the plurality of modulators to generate a modulated signal, the plurality of input signals being provided to the plurality of modulators in such a manner that the combining of the outputs generates the modulated signal according to a second modulation scheme. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification