BLOCK CODING SCHEME FOR PHY DATA UNIT TRANSMISSION

• US 20160241682A1
• Filed: 02/17/2016
• Published: 08/18/2016
• Est. Priority Date: 02/17/2015
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Inventors: XU, Mingguang, SUN, Yakun, ZHANG, Hongyuan, WANG, Lei, LOU, Hui-Ling
• Granted Patent: US 10,079,918 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0013 Rate matching, e.g. puncturing or repetition of code symbols
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0056 Systems characterized by the type of code used H04L1/08 takes precedence
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2603 Signal structure ensuring backward compatibility with legacy system
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers

Abstract

A communication device receives a plurality of information bits and determines a maximum number of information bits that can be encoded such that, after the plurality of information bits have been encoded using i) a forward error correction scheme, and ii) a block coding scheme, the block coded bits fit within a single orthogonal frequency division multiplex (OFDM) symbol. The maximum number of information bits is based on a number of repetitions of coded information bits by the block coding scheme, and a number of block coded bits for the maximum number of information bits is less than a number of data tones of the single OFDM symbol. The communication device encodes the plurality of information bits using the forward error correction scheme and the block coding scheme to generate block coded bits, and generates a physical layer data unit to include the block coded bits in the single OFDM symbol.

Claims

1. A method for generating a physical layer (PHY) data unit for transmission by a communication device via a communication channel, the method comprising:

receiving, by the communication device, a plurality of information bits to be included in the PHY data unit;

determining, by the communication device, a maximum number of information bits that can be encoded such that, after the plurality of information bits have been encoded using i) a forward error correction scheme to obtain coded information bits, and ii) a block coding scheme to obtain block coded bits from the coded information bits, the block coded bits fit within a single orthogonal frequency division multiplex (OFDM) symbol on the communication channel, wherein

the maximum number of information bits is based on a number of repetitions of the coded information bits by the block coding scheme, and

a number of the block coded bits for the maximum number of information bits is less than a number of data tones of the single OFDM symbol;

encoding, by the communication device, the plurality of information bits with the maximum number of information bits using the forward error correction scheme and the block coding scheme to generate the block coded bits; and

generating, by the communication device, the PHY data unit to include the block coded bits in the single OFDM symbol.

2. The method of claim 1, wherein:

a number of unused data tones of the single OFDM symbol is equal to a difference between the number of data tones of the single OFDM symbol and the number of the block coded bits for the maximum number of information bits, where

the maximum number of information bits is determined as

3. The method of claim 2, wherein generating the PHY data unit comprises filling the number of unused data tones with padded bits.

4. The method of claim 2, wherein generating the PHY data unit comprises filling the number of unused data tones with edge tones.

5. The method of claim 2, wherein generating the PHY data unit comprises filling the number of unused data tones with direct current tones.

6. The method of claim 2, wherein generating the PHY data unit comprises filling the number of unused data tones with pilot tones.

7. The method of claim 2, wherein generating the PHY data unit comprises leaving the number of unused data tones empty.

8. The method of claim 2, wherein generating the PHY data unit comprises filling the number of unused data tones with additional repetitions of the block coded bits.

9. A communication device comprising:

a network interface device having one or more integrated circuits configured to;

receive a plurality of information bits to be included in the PHY data unit,

determine a maximum number of information bits that can be encoded such that, after the plurality of information bits have been encoded using i) a forward error correction scheme to obtain coded information bits, and ii) a block coding scheme to obtain block coded bits from the coded information bits, the block coded bits fit within a single orthogonal frequency division multiplex (OFDM) symbol on the communication channel, wherein

the maximum number of information bits is based on a number of repetitions of the coded information bits by the block coding scheme, and

a number of the block coded bits for the maximum number of information bits is less than a number of data tones of the single OFDM symbol,

encode the plurality of information bits with the maximum number of information bits using the forward error correction scheme and the block coding scheme to generate the block coded bits, and

generate the PHY data unit to include the block coded bits in the single OFDM symbol.

10. The communication device of claim 9, wherein:

a number of unused data tones of the single OFDM symbol is equal to a difference between the number of data tones of the single OFDM symbol and the number of the block coded bits for the maximum number of information bits, where

the maximum number of information bits is determined as

11. The communication device of claim 10, wherein the one or more integrated circuits are configured to fill the number of unused data tones with padded bits.

12. The communication device of claim 10, wherein the one or more integrated circuits are configured to fill the number of unused data tones with one or more of edge tones, direct current tones, or pilot tones.

13. The communication device of claim 10, wherein the one or more integrated circuits are configured to fill the number of unused data tones with additional repetitions of the block coded bits.

14. A method for generating a physical layer (PHY) data unit for transmission by a communication device via a communication channel, the method comprising:

receiving, by the communication device, a plurality of information bits to be included in the PHY data unit;

determining, by the communication device, a maximum number of information bits that can be encoded such that, after the plurality of information bits have been encoded using i) a forward error correction scheme to obtain coded information bits, ii) a block coding scheme to obtain block coded bits from the coded information bits with a base number of repetitions, and iii) a puncturing scheme to obtain punctured bits from the block coded bits, the punctured bits fit within a single orthogonal frequency division multiplex (OFDM) symbol on the communication channel, wherein

the maximum number of information bits is based on a number of repetitions of the coded information bits by the block coding scheme, and

at least some of the plurality of information bits corresponding to the punctured bits have a different number of repetitions;

encoding, by the communication device, the plurality of information bits with the maximum number of information bits using the forward error correction scheme, the block coding scheme, and the puncturing scheme to generate the punctured bits; and

generating, by the communication device, the PHY data unit to include the punctured bits in the single OFDM symbol.

15. The method of claim 14, wherein:

the block coded bits include the punctured bits and a number of surplus bits to be punctured by the puncturing scheme;

the number of surplus bits is equal to a difference between a number of the block coded bits for the maximum number of information bits and a number of data tones of the single OFDM symbol;

the maximum number of information bits is determined as

16. The method of claim 15, wherein the surplus bits are consecutive and positioned at an end of the block coded bits.

17. The method of claim 15, wherein the surplus bits are interleaved with the punctured bits.

19. The communication device of claim 14, wherein:

the block coded bits include the punctured bits and a number of surplus bits to be punctured by the puncturing scheme;

the number of surplus bits is equal to a difference between a number of the block coded bits for the maximum number of information bits and the number of data tones of the single OFDM symbol;

the maximum number of information bits is determined as

20. The communication device of claim 15, wherein the surplus bits are consecutive and positioned at an end of the block coded bits.

18. A communication device comprising:

a network interface device having one or more integrated circuits configured to;

receive a plurality of information bits to be included in the PHY data unit;

determine a maximum number of information bits that can be encoded such that, after the plurality of information bits have been encoded using i) a forward error correction scheme to obtain coded information bits, ii) a block coding scheme to obtain block coded bits from the coded information bits with a base number of repetitions, and iii) a puncturing scheme to obtain punctured bits from the block coded bits, the punctured bits fit within a single orthogonal frequency division multiplex (OFDM) symbol on the communication channel, wherein

the maximum number of information bits is based on a number of repetitions of the coded information bits by the block coding scheme, and

at least some of the plurality of information bits corresponding to the punctured bits have a different number of repetitions;

encode the plurality of information bits with the maximum number of information bits using the forward error correction scheme, the block coding scheme, and the puncturing scheme to generate the punctured bits; and

generate the PHY data unit to include the punctured bits in the single OFDM symbol.