Low bandwidth PHY for WLAN
First Claim
1. A method comprising:
- generating a first data unit corresponding to a first physical layer (PHY) mode, wherein generating the first data unit includes(a) forward error correction (FEC) encoding a first plurality of information bits,(b) mapping the FEC-encoded first plurality of information bits to a first plurality of constellation symbols, and(c) generating a first plurality of orthogonal frequency division multiplexing (OFDM) symbols to include the first plurality of constellation symbols, wherein the first plurality of OFDM symbols (i) utilizes a first tone spacing, and (ii) includes a first number of non-zero tones collectively spanning a first bandwidth; and
generating a second data unit corresponding to a second PHY mode, wherein generating the second data unit includes(a) FEC encoding a second plurality of information bits,(b) block encoding the FEC-encoded second plurality of information bits,(c) mapping the block-encoded second plurality of information bits to a second plurality of constellation symbols, and(d) generating a second plurality of OFDM symbols to include the second plurality of constellation symbols, whereinthe second plurality of OFDM symbols (i) utilizes the first tone spacing, and (ii) includes a second number of non-zero tones collectively spanning a second bandwidth,the second number of non-zero tones is less than the first number of non-zero tones, andthe second bandwidth is less than the first bandwidth.
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Abstract
A method includes generating first and second data units corresponding to first and second PHY modes, respectively. Generating the first data unit includes FEC encoding first information bits, mapping the FEC-encoded bits to first constellation symbols, and generating first OFDM symbols to include the first constellation symbols. The first OFDM symbols utilize a first tone spacing, and include a first number of non-zero tones collectively spanning a first bandwidth. Generating the second data unit includes FEC encoding second information bits, block encoding the FEC-encoded bits, mapping the block-encoded bits to second constellation symbols, and generating second OFDM symbols to include the second constellation symbols. The second OFDM symbols utilize the first tone spacing, and include a second number of non-zero tones collectively spanning a second bandwidth less than the first bandwidth. The second number of non-zero tones is less than the first number of non-zero tones.
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Citations
28 Claims
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1. A method comprising:
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generating a first data unit corresponding to a first physical layer (PHY) mode, wherein generating the first data unit includes (a) forward error correction (FEC) encoding a first plurality of information bits, (b) mapping the FEC-encoded first plurality of information bits to a first plurality of constellation symbols, and (c) generating a first plurality of orthogonal frequency division multiplexing (OFDM) symbols to include the first plurality of constellation symbols, wherein the first plurality of OFDM symbols (i) utilizes a first tone spacing, and (ii) includes a first number of non-zero tones collectively spanning a first bandwidth; and generating a second data unit corresponding to a second PHY mode, wherein generating the second data unit includes (a) FEC encoding a second plurality of information bits, (b) block encoding the FEC-encoded second plurality of information bits, (c) mapping the block-encoded second plurality of information bits to a second plurality of constellation symbols, and (d) generating a second plurality of OFDM symbols to include the second plurality of constellation symbols, wherein the second plurality of OFDM symbols (i) utilizes the first tone spacing, and (ii) includes a second number of non-zero tones collectively spanning a second bandwidth, the second number of non-zero tones is less than the first number of non-zero tones, and the second bandwidth is less than the first bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus comprising:
a network interface configured to generate a first data unit corresponding to a first physical layer (PHY) mode, wherein the network interface is configured to generate the first data unit at least in part by (a) forward error correction (FEC) encoding a first plurality of information bits, (b) mapping the FEC-encoded first plurality of information bits to a first plurality of constellation symbols, and (c) generating a first plurality of orthogonal frequency division multiplexing (OFDM) symbols to include the first plurality of constellation symbols, wherein the first plurality of OFDM symbols (i) utilizes a first tone spacing and (ii) includes a first number of non-zero tones collectively spanning a first bandwidth, and generate a second data unit corresponding to a second PHY mode, wherein the network interface is configured to generate the second data unit at least in part by (a) FEC encoding a second plurality of information bits, (b) block encoding the FEC-encoded second plurality of information bits, (c) mapping the block-encoded second plurality of information bits to a second plurality of constellation symbols, and (d) generating a second plurality of OFDM symbols to include the second plurality of constellation symbols, wherein the second plurality of OFDM symbols (i) utilizes the first tone spacing and (ii) includes a second number of non-zero tones collectively spanning a second bandwidth, the second number of non-zero tones is less than the first number of non-zero tones, and the second bandwidth is less than the first bandwidth. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method comprising:
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generating a first data unit corresponding to a first physical layer (PHY) mode, wherein generating the first data unit includes (a) forward error correction (FEC) encoding a first plurality of information bits according to a first modulation and coding scheme (MCS) selected from a plurality of MCSs, wherein the plurality of MCSs corresponds to a plurality of throughput levels, a portion of the first plurality of information bits corresponds to a data portion of the first data unit, and another portion of the first plurality of information bits corresponds to a signal field of a preamble of the first data unit, (b) mapping the FEC-encoded first plurality of information bits to a first plurality of constellation symbols according to the first MCS, and (c) generating a first plurality of orthogonal frequency division multiplexing (OFDM) symbols to include the first plurality of constellation symbols, wherein the first plurality of OFDM symbols (i) utilizes a first tone spacing and (ii) includes a first number of non-zero tones collectively spanning a first bandwidth; and generating a second data unit corresponding to a second PHY mode, wherein generating the second data unit includes (a) FEC encoding a second plurality of information bits according to a second MCS, wherein the second MCS corresponds to a throughput level equal to or less than a lowest throughput level of the plurality of throughput levels, a portion of the second plurality of information bits corresponds to a data portion of the second data unit, and another portion of the second plurality of information bits corresponds to a signal field of a preamble of the second data unit, (b) partitioning the FEC-encoded second plurality of information bits into blocks of n information bits, (c) repeating each block of n information bits two times to generate 2*n information bits, (d) mapping the partitioned and repeated second plurality of information bits to a second plurality of constellation symbols according to the second MCS, and (e) generating a second plurality of OFDM symbols to include the second plurality of constellation symbols, wherein the second plurality of OFDM symbols (i) utilizes the first tone spacing and (ii) includes a second number of non-zero tones collectively spanning a second bandwidth, the second number of non-zero tones is no more than half the first number of non-zero tones, and the second bandwidth is no more than half the first bandwidth. - View Dependent Claims (24, 25)
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26. An apparatus comprising:
a network interface configured to generate a first data unit corresponding to a first physical layer (PHY) mode, wherein the network interface is configured to generate the first data unit at least in part by (a) forward error correction (FEC) encoding a first plurality of information bits according to a first modulation and coding scheme (MCS) selected from a plurality of MCSs, wherein the plurality of MCSs corresponds to a plurality of throughput levels, a portion of the first plurality of information bits corresponds to a data portion of the first data unit, and another portion of the first plurality of information bits corresponds to a signal field of a preamble of the first data unit, (b) mapping the FEC-encoded first plurality of information bits to a first plurality of constellation symbols according to the first MCS, and (c) generating a first plurality of orthogonal frequency division multiplexing (OFDM) symbols to include the first plurality of constellation symbols, wherein the first plurality of OFDM symbols (i) utilizes a first tone spacing and (ii) includes a first number of non-zero tones collectively spanning a first bandwidth, and generate a second data unit corresponding to a second PHY mode, wherein the network interface is configured to generate the second data unit at least in part by (a) FEC encoding a second plurality of information bits according to a second MCS, wherein the second MCS corresponds to a throughput level equal to or less than a lowest throughput level of the plurality of throughput levels, a portion of the second plurality of information bits corresponds to a data portion of the second data unit, and another portion of the second plurality of information bits corresponds to a signal field of a preamble of the second data unit, (b) partitioning the FEC-encoded second plurality of information bits into blocks of n information bits, (c) repeating each block of n information bits two times to generate 2*n information bits, (d) mapping the partitioned and repeated second plurality of information bits to a second plurality of constellation symbols according to the second MCS, and (e) generating a second plurality of OFDM symbols to include the second plurality of constellation symbols, wherein the second plurality of OFDM symbols (i) utilizes the first tone spacing and (ii) includes a second number of non-zero tones collectively spanning a second bandwidth, the second number of non-zero tones is no more than half the first number of non-zero tones, and the second bandwidth is no more than half the first bandwidth. - View Dependent Claims (27, 28)
Specification