High speed communications system

• US 10,608,850 B2
• Filed: 08/09/2019
• Issued: 03/31/2020
• 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:
  US16/537,507
• Publication Number:
  US 20190363912A1
• Time in Patent Office: 235 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:

obtaining a set of information bits;

generating a set of spectral-shaped pre-coded signals from the set of information bits based on a previous set of information bits and a superposition of a plurality of mutually orthogonal sub-channel code vectors, each sub-channel code vector associated with a respective information bit of the set of information bits and a corresponding information bit of the previous set of information bits; and

transmitting the set of spectral-shaped pre-coded signals over respective wires of a multi-wire bus.

2. The method of claim 1, wherein transmitting the set of spectral-shaped pre-coded signals over the respective wires of the multi-wire bus comprises generating a set of wire-specific outputs based on a superposition of the set of spectral-shaped pre-coded signals and a set of carrier-modulated spectral-shaped pre-coded signals.

3. The method of claim 2, wherein the set of spectral-shaped pre-coded signals correspond to baseband spectral-shaped pre-coded signals.

4. The method of claim 1, wherein generating the set of spectral-shaped pre-coded signals comprises generating a set of duobinary-encoded bits from the set of information bits and the previous set of information bits, and wherein said each sub-channel code vector is associated with a respective bit of the set of duobinary-encoded bits.

5. The method of claim 1, wherein generating the set of spectral-shaped pre-coded signals comprises:

generating a first set of vector-encoded signals from the set of information bits according to the plurality of mutually-orthogonal sub-channel code vectors;

generating a second set of vector-encoded signals from the previous set of information bits according to the plurality of mutually-orthogonal sub-channel code vectors; and

forming a summation of the first and second sets of vector-encoded signals.

6. The method of claim 1, further comprising obtaining the spectral-shaped pre-coded signals at a plurality of multi-input comparators (MICs), and responsively generating a set of linear signal sub-channels, each linear signal sub-channel generated from a respective mixing operation of the obtained spectral-shaped pre-coded signals according to a respective sub-channel code vector of the plurality of mutually orthogonal sub-channel code vectors.

7. The method of claim 6, wherein said each linear signal sub-channel has one of two possible signal values, and wherein the method further comprises generating a set of output bits representative of the set of information bits by slicing each linear signal sub-channel.

8. The method of claim 6, wherein said each linear signal sub-channel has one of at least three possible signal values.

9. The method of claim 8, further comprising generating a set of output bits by decoding the set of linear signal sub-channels.

10. The method of claim 9, wherein decoding the set of linear signal sub-channels comprises slicing said each linear signal sub-channel against at least two reference voltages.

11. An apparatus comprising:

an encoder configured to obtain a set of information bits, and to responsively generating a set of spectral-shaped pre-coded signals from the set of information bits based on a previous set of information bits and a superposition of a plurality of mutually orthogonal sub-channel code vectors, each sub-channel code vector associated with a respective information bit of the set of information bits and a corresponding information bit of the previous set of information bits; and

a multi-wire bus configured to transport the set of spectral-shaped pre-coded signals over respective wires.

12. The apparatus of claim 11, wherein the encoder comprise a modulation circuit configured to generate a set of carrier-modulated spectral-shaped pre-coded signals, and a summation circuit configured to generate a set of wire-specific outputs from a superposition of the set of spectral-shaped pre-coded signals and the set of carrier-modulated spectral-shaped pre-coded signals.

13. The apparatus of claim 12, wherein the set of spectral-shaped pre-coded signals correspond to baseband spectral-shaped pre-coded signals.

14. The apparatus of claim 11, wherein the encoder comprises:

a duobinary encoder configured to generate the set of spectral-shaped pre-coded signals comprises generating a set of duobinary-encoded bits from the set of information bits and the previous set of information bits; and

a vector signaling encoder configured to generate the set of spectral-shaped pre-coded signals, wherein each sub-channel code vector is associated with a respective bit of the set of duobinary-encoded bits.

15. The apparatus of claim 11, wherein the encoder comprises:

two sets of analog voltage generators driven from first and second sets of vector-encoded signals generated from the set of information bits and the previous set of information bits, respectively, each analog voltage generator configured to generate a respective set of voltages; and

a summation circuit configured to generate the spectral-shaped pre-coded signals by forming a summation of the respective sets of voltages.

16. The apparatus of claim 11, further comprising a plurality of multi-input comparators configured to obtain the spectral-shaped pre-coded signals, and to responsively generate a set of linear signal sub-channels, each linear signal sub-channel generated from a respective mixing operation of the obtained spectral-shaped pre-coded signals according to a respective sub-channel code vector of the plurality of mutually orthogonal sub-channel code vectors.

17. The apparatus of claim 16, wherein said each linear signal sub-channel has one of two possible signal values, and wherein the plurality of MICs are configured to generate a set of output bits representative of the set of information bits by slicing said each linear signal sub-channel.

18. The apparatus of claim 16, wherein said each linear signal sub-channel has one of at least three possible signal values.

19. The apparatus of claim 18, further comprising a decoder configured to generate a set of output bits by decoding the set of linear signal sub-channels.

20. The apparatus of claim 19, wherein the decoder is configured to slice said each linear signal sub-channel of the set of the set of linear signal sub-channels against at least two reference voltages.