Transmission of baseband and carrier-modulated vector codewords, using a plurality of encoders, each encoder configured to receive information bits and to generate a set of baseband-encoded symbols representing a vector codeword; one or more modulation circuits, each modulation circuit configured to
Transmission of baseband and carrier-modulated vector codewords, using a plurality of encoders, each encoder configured to receive information bits and to generate a set of baseband-encoded symbols representing a vector codeword; one or more modulation circuits, each modulation circuit configured to operate on a corresponding set of baseband-encoded symbols, and using a respective unique carrier frequency, to generate a set of carrier-modulated encoded symbols; and, a summation circuit configured to generate a set of wire-specific outputs, each wire-specific output representing a sum of respective symbols of the carrier-modulated encoded symbols and at least one set of baseband-encoded symbols.
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1. A method comprising: receiving, at a plurality of orthogonal subchannel multi-input comparators (MICs), a set of wire-specific inputs, each wire-specific input carrying a combination of a respective baseband symbol of a baseband codeword and at least one respective carrier-modulated symbol of at
1. A method comprising: receiving, at a plurality of orthogonal subchannel multi-input comparators (MICs), a set of wire-specific inputs, each wire-specific input carrying a combination of a respective baseband symbol of a baseband codeword and at least one respective carrier-modulated symbol of at least one carrier-modulated codeword; andgenerating a plurality of superposition subchannel signals, each superposition subchannel signal generated by a corresponding orthogonal subchannel MIC forming a respective subchannel-specific linear combination of the set of wire-specific inputs, each superposition subchannel signal comprising a respective superposition of (i) a baseband subchannel signal and (ii) one or more carrier-modulated subchannel signals, the baseband subchannel signal and the one or more carrier-modulated subchannel signals associated with the baseband codeword and the at least one respective carrier-modulated codeword, respectively. 2. The method of claim 1, further comprising generating a set of decoded output bits based on the plurality of superposition subchannel signals. 3. The method of claim 2, wherein generating the set of decoded output bits are generated using a plurality of samplers. 4. The method of claim 3, further comprising applying decision feedback equalization (DFE) correction signals to adjust thresholds of the plurality of samplers. 5. The method of claim 1, further comprising parsing, using a plurality of filters, each superposition subchannel signal of the plurality of superposition subchannel signals into the baseband subchannel signal and the at least one carrier-modulated subchannel signal. 6. The method of claim 1, further comprising generating, for each of the at least one carrier-modulated subchannel signal, a corresponding demodulated-baseband subchannel signal using a balanced mixer circuit of a set of at least one balanced mixer circuit. 7. The method of claim 1, wherein each respective subchannel-specific linear combination is performed according to a row of an orthogonal matrix. 8. The method of claim 7, wherein the orthogonal matrix is a Hadamard matrix. 9. The method of claim 8, wherein the Hadamard matrix has a size of 4. 10. The method of claim 1, wherein the baseband codeword and the at least one carrier-modulated codeword are balanced. 11. An apparatus comprising: a plurality of wires of a multi-wire bus, the plurality of wires configured to carry a set of wire-specific inputs, each wire-specific input comprising a combination of a respective baseband symbol of a baseband codeword and at least one respective carrier-modulated symbol of at least one carrier-modulated codeword; anda plurality of orthogonal subchannel multi-input comparators (MICs) configured to generate a plurality of superposition subchannel signals, each superposition subchannel signal generated by a corresponding orthogonal subchannel MIC forming a respective subchannel-specific linear combination of the set of wire-specific inputs, each superposition subchannel signal comprising a respective superposition of (i) a baseband subchannel signal and (ii) one or more carrier-modulated subchannel signals, the baseband subchannel signal and the one or more carrier-modulated subchannel signals associated with the baseband codeword and the at least one respective carrier-modulated codeword, respectively. 12. The apparatus of claim 11, further comprising a plurality of samplers configured to generate a set of decoded output bits based on the plurality of superposition subchannel signals. 13. The apparatus of claim 12, further comprising a decision feedback equalization (DFE) circuit configured to generate a set of DFE correction signals based on the set of decoded output bits. 14. The apparatus of claim 13, wherein the DFE correction signals adjust sampling thresholds of the plurality of samplers. 15. The apparatus of claim 11, further comprising a plurality of filters configured to parse each superposition subchannel signal of the plurality of superposition subchannel signals into the baseband subchannel signal and the at least one carrier-modulated subchannel signal. 16. The apparatus of claim 11, further comprising a set of at least one balanced mixer circuits, each balanced mixer circuit configured to operate on a respective carrier-modulated subchannel signal and to responsively generate a corresponding demodulated-baseband subchannel signal. 17. The apparatus of claim 11, wherein each respective subchannel-specific linear combination is performed according to a row of an orthogonal matrix. 18. The apparatus of claim 17, wherein the orthogonal matrix is a Hadamard matrix. 19. The apparatus of claim 18, wherein the Hadamard matrix has a size of 4. 20. The apparatus of claim 11, wherein the baseband codeword and the at least one carrier-modulated codeword are balanced.
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