High speed communications system

• US 10,382,235 B2
• Filed: 10/30/2018
• Issued: 08/13/2019
• Est. Priority Date: 06/26/2015
• Status: Active Grant

• Current Assignee: Kandou Labs, SA
• Original Assignee: Kandou Labs, SA
• Inventors: Hormati, Ali, Tajalli, Armin, Shokrollahi, Amin
• Primary Examiner(s): Aghdam, Freshteh N
• Application Number:
  US16/175,800
• Publication Number:
  US 20190068414A1
• Time in Patent Office: 287 Days
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 25/03057 with a recursive structure H04L25/03031 takes precedence
• CPC Class Codes: H04L 25/03885 adaptive
• CPC Class Codes: H04L 25/03898 codebook-based design selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456
• CPC Class Codes: H04L 25/49 using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems spectral shaping H04L25/03828

Abstract

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.

Claims

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; and

generating 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; and

parsing, using a plurality of filters, each superposition subchannel signal of the plurality of superposition subchannel signals into the baseband subchannel signal and one or more temporally misaligned carrier-modulated subchannel signals, and separately sampling the baseband subchannel signal and the one or more temporally misaligned carrier-modulated subchannel signals;

wherein

the plurality of filters introducing one or more respective delays between at least two subchannel signals of the baseband subchannel signal and the one or more carrier-modulated subchannel signals.

2. The method of claim 1, further comprising generating respective sets of decoded output bits based on the sampled baseband subchannel signal and the one or more temporally misaligned carrier-modulated subchannel signals.

3. The method of claim 1, further comprising applying decision feedback equalization (DFE) correction signals to adjust thresholds of a plurality of samplers separately sampling the baseband subchannel signal and the one or more temporally misaligned carrier-modulated subchannel signals.

4. The method of claim 1, wherein the plurality of filters introduce respective delays into the baseband subchannel signal and one or more temporally misaligned carrier-modulated subchannel signals.

5. The method of claim 2, further comprising realigning the respective sets of decoded output bits according to the one or more respective delays.

6. The method of claim 1, further comprising generating, for each of the at least one carrier-modulated subchannel signals, a corresponding demodulated-baseband subchannel signal using a balanced mixer circuit of a set of at least one balanced mixer circuits.

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;

a 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;

a plurality of filters configured to parse each superposition subchannel signal of the plurality of superposition subchannel signals into the baseband subchannel signal and one or more temporally misaligned carrier-modulated subchannel signals; and

a plurality of samplers configured to separately sample the baseband subchannel signal and one or more temporally misaligned carrier-modulated subchannel signals.

12. The apparatus of claim 11, wherein the plurality of samplers are configured to generate a set of decoded output bits based on the separately sampled baseband subchannel signal and one or more temporally misaligned carrier-modulated 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, the DFE correction signals configured to adjust sampling thresholds of the plurality of samplers.

14. The apparatus of claim 12, further comprising retiming elements configured to realign the respective sets of decoded output bits according to the one or more respective delays.

15. The apparatus of claim 11, wherein the plurality of filters introduce respective delays into the baseband subchannel signal and the one or more temporally misaligned carrier-modulated subchannel signals.

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.