Control mode PHY for WLAN
In a method for generating a physical layer (PHY) data unit for transmission via a communication channel, information bits to be included in the PHY data unit are encoded using a forward error correction (FEC) encoder. Also, the information bits are encoded according to a block coding scheme, where m copies of each bit are included in the information bits, and one or more bits in the m copies of each bit are flipped. The information bits are mapped to a plurality of constellation symbols, and a plurality of orthogonal frequency division multiplexing (OFDM) symbols are generated to include the plurality of constellation symbols. The PHY data unit is generated to include the plurality of OFDM symbols.
1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel, the method comprising:
encoding a plurality of information bits using a forward error correction (FEC) encoder;
encoding the plurality of information bits according to a block coding scheme, comprising
including in the plurality of information bits m copies of each bit in the plurality of information bits, wherein one or more bits in the m copies of each bit are flipped;
after encoding the plurality of information bits according to the block coding scheme, interleaving the plurality of information bits;
mapping the plurality of information bits to a plurality of constellation symbols;
generating a plurality of orthogonal frequency division multiplexing (OFDM) symbols to include the plurality of constellation symbols; and
generating the PHY data unit to include the plurality of OFDM symbols.
2. A method according to claim 1 , wherein encoding the plurality of information bits according to the block coding scheme comprises:
including in the plurality of information bits a plurality of blocks D of bits in the plurality of information bits, wherein each block D corresponds to an exclusive OR of a respective block C of bits in the plurality of information bits with a sequence M of bits.
3. A method according to claim 2 , wherein the sequence M consists of ones.
4. A method according to claim 2 , wherein the sequence M includes multiple zeros and multiple ones.
5. A method according to claim 1 , wherein encoding the plurality of information bits according to the block coding scheme comprises repeating each bit of the plurality of information bits so that each bit is included in the plurality of information bits m consecutive times.
6. A method according to claim 1 , wherein:
encoding the plurality of information bits according to the block coding scheme occurs after encoding the plurality of information bits using the FEC encoder; and
encoding the plurality of information bits according to the block coding scheme comprises repeating each block of n bits so that m consecutive copies of each block of n bits are included in the plurality of information bits.
7. A method according to claim 6 , wherein encoding the plurality of information bits according to the block coding scheme comprises, in each set of m consecutive copies, exclusive ORing at least one of the m copies with a sequence M of bits.
8. A method according to claim 7 , wherein the sequence M includes multiple zeros and multiple ones.
9. A method according to claim 1 , wherein encoding the plurality of information bits according to the block coding scheme further includes interleaving the plurality of information bits according to a predetermined code in addition to interleaving the plurality of information bits after encoding the plurality of information bits according to the block coding scheme.
10. A method according to claim 1 , wherein encoding the plurality of information bits according to the block code is performed after encoding the information bits using the FEC encoder.
11. A method according to claim 1 , wherein encoding the plurality of information bits using the FEC encoder comprises encoding the plurality of information bits using a binary convolutional coding (BCC) encoder.
12. An apparatus for generating a PHY data unit for transmission via a communication channel, the apparatus comprising:
a network interface device including:
a forward error correction (FEC) encoder to encode a plurality of information bits to be included in the PHY data unit; and
a constellation mapper to map the plurality of information bits to a plurality of constellation symbols;
wherein the network interface device is configured to:
encode the plurality of information bits according to a block coding scheme, comprising including m copies of each bit in the plurality of information bits, wherein one or more bits in the m copies of each bit are flipped,
after encoding the plurality of information bits according to the block coding scheme, interleave the plurality of information bits,
generate a plurality of OFDM symbols to include the plurality of constellation symbols, and
generate the PHY data unit to include the plurality of orthogonal frequency division multiplexing (OFDM) symbols.
13. An apparatus according to claim 12 , wherein the network interface device is configured to encode the plurality of information bits according to the block coding scheme at least by including in the plurality of information bits a plurality of blocks D of bits in the plurality of information bits, wherein each block D corresponds to an exclusive OR of a respective block C of bits in the plurality of information bits with a sequence M of bits.
14. An apparatus according to claim 13 , wherein the sequence M consists of ones.
15. An apparatus according to claim 13 , wherein the sequence M includes multiple zeros and multiple ones.
16. An apparatus according to claim 12 , wherein the network interface device is configured to encode the plurality of information bits according to the block coding scheme at least by repeating each bit of the plurality of information bits so that each bit is included in the plurality of information bits m consecutive times.
17. An apparatus according to claim 12 , wherein the network interface device is configured to
encode the plurality of information bits according to the block coding scheme after encoding of the plurality of information bits by the FEC encoder, and
encode the plurality of information bits according to the block coding scheme at least by repeating each block of n bits so that m consecutive copies of each block of n bits are included in the plurality of information bits.
18. A method according to claim 17 , the network interface device is configured to encode the plurality of information bits according to the block coding scheme at least by, in each set of m consecutive copies, exclusive ORing at least one of the m copies with a sequence M of bits.
19. A method according to claim 18 , wherein the sequence M includes multiple zeros and multiple ones.
20. An apparatus according to claim 17 , wherein the network interface is further configured to, as part of encoding the plurality of information bits according to the block coding scheme, interleave the plurality of information bits in each block of n bits in addition to interleaving the plurality of information bits after encoding the plurality of information bits according to the block coding scheme.
21. An apparatus according to claim 12 , wherein the network interface is configured to encode the plurality of information bits according to the block code after encoding of the plurality of information bits by the FEC encoder.
22. An apparatus according to claim 12 , the FEC encoder includes a binary convolutional coding (BCC) encoder.
23. A method for generating a physical layer (PHY) data unit for transmission via a communication channel, the method comprising:
encoding a plurality of information bits using a forward error correction (FEC) encoder;
mapping the plurality of information bits to a plurality of constellation symbols;
encoding the plurality of constellation symbols according to a block coding scheme, comprising
including in the plurality of constellation symbols m copies of each constellation symbol in the plurality of constellation symbols, wherein one or more constellation symbol in the m copies of each constellation symbol are phase shifted;
generating a plurality of orthogonal frequency division multiplexing (OFDM) symbols to include the plurality of constellation symbols; and
generating the PHY data unit to include the plurality of OFDM symbols.
24. A method according to claim 23 , wherein encoding the plurality of constellation symbols according to the block coding scheme comprises:
including in the plurality of constellation symbols a plurality of blocks D of constellation symbols in the plurality of constellation symbols, wherein each block D corresponds to respective constellation symbols in a respective block C multiplied with respective phase rotation factors in a sequence M of phase rotation factors.
25. A method according to claim 24 , wherein the sequence M consists of equal phase rotation factors.
26. A method according to claim 24 , wherein the sequence M includes different phase rotation factors.
27. A method according to claim 23 , wherein encoding the plurality of constellation symbols according to the block coding scheme comprises repeating each block C of n constellation symbols so that m consecutive copies of each block C are included in the plurality of constellation symbols.
28. A method according to claim 27 , wherein encoding the plurality of constellation symbols according to the block coding scheme comprises, in each set of m consecutive copies of C, multiplying, for at least one of the m copies of C, respective constellation symbols in the block C with respective phase rotation factors in a sequence M of phase rotation factors.
29. A method according to claim 28 , wherein the sequence M includes different phase rotation factors.
30. A method according to claim 23 , further comprising interleaving the plurality of information bits according to a predetermined code.
31. A method according to claim 23 , wherein encoding the plurality of information bits using the FEC encoder comprises encoding the plurality of information bits using a binary convolutional coding (BCC) encoder.
32. An apparatus for generating a PHY data unit for transmission via a communication channel, the apparatus comprising:
a network interface device including:
a forward error correction (FEC) encoder to encode a plurality of information bits to be included in the PHY data unit; and
a constellation mapper to map the plurality of information bits to a plurality of constellation symbols;
wherein the network interface device is configured to:
encode the plurality of constellation symbols according to a block coding scheme, at least by including in the plurality of constellation symbols m copies of each constellation symbol in the plurality of constellation symbols, wherein one or more constellation symbol in the m copies of each constellation symbol are phase shifted,
generate a plurality of OFDM symbols to include the plurality of constellation symbols, and
generate the PHY data unit to include the plurality of orthogonal frequency division multiplexing (OFDM) symbols.
33. An apparatus according to claim 32 , wherein the network interface device is configured to encode the plurality of constellation symbols according to the block coding scheme at least by including in the plurality of constellation symbols a plurality of blocks D of constellation symbols in the plurality of constellation symbols, wherein each block D corresponds to respective constellation symbols in a respective block C multiplied with respective phase rotation factors in a sequence M of phase rotation factors.
34. An apparatus according to claim 33 , wherein the sequence M consists of equal phase rotation factors.
35. An apparatus according to claim 33 , wherein the sequence M includes different phase rotation factors.
36. An apparatus according to claim 32 , wherein the network interface device is configured to encode the plurality of constellation symbols according to the block coding scheme at least by repeating each block C of n constellation symbols so that m consecutive copies of each block C are included in the plurality of constellation symbols.
37. A method according to claim 36 , the network interface device is configured to encode the plurality of constellation symbols according to the block coding scheme at least by, in each set of m consecutive copies of C, multiplying, for at least one of the m copies of C, respective constellation symbols in the block C with respective phase rotation factors in a sequence M of phase rotation factors.
38. A method according to claim 37 , wherein the sequence M includes different phase rotation factors.
39. An apparatus according to claim 32 , wherein the network interface is further configured to interleave the plurality of information bits according to a predetermined code.
40. An apparatus according to claim 32 , wherein the FEC encoder includes a binary convolutional coding (BCC) encoder.