Compressed orthogonal frequency division multiplexing (OFDM) symbols in a wireless communication system
First Claim
1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel, the method comprising:
- receiving a plurality of information bits to be included in a data portion of the PHY data unit;
adding one or more first padding bits to the information bits such that the information bits, after being encoded, fill one or more OFDM symbols up to a first portion of a last OFDM symbol, wherein the first portion of the last OFDM symbol is an initial portion of the last OFDM symbol up to a boundary within the last OFDM symbol, and wherein the method includesdetermining a number of excess information bits, of the plurality of information bits, to be included in the last OFDM symbol, andselecting a boundary value of the boundary within the last OFDM symbol based on the determined number of excess information bits;
encoding the information bits and the first padding bits to generate coded bits;
performing one of (i) adding one or more second padding bits to the coded bits corresponding to the last OFDM symbol or (ii) adding one or more padding constellation points to a set of constellation points generated based on the coded bits corresponding to the last OFDM symbol such that the padded coded bits or the padded constellation points occupy a second portion of the last OFDM symbol, wherein the second portion is a remaining portion of the last OFDM symbol after the boundary; and
generating the one or more OFDM symbols, including generating the last OFDM symbol to include (i) the coded information bits corresponding to the last OFDM symbol, (ii) the coded first padding bits in the first portion of the last OFDM symbol to allow a receiving device to stop decoding the one or more OFDM symbols after decoding the first portion of the last OFDM symbol, and (iii) the one or more second padding bits or the one or more padding constellation points in the second portion of the last OFDM symbol; and
generating the PHY data unit to include at least the one or more OFDM symbols.
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Accused Products
Abstract
One or more first padding bits are added to information bits to be included in a data portion of a data unit such that the information bits, after being encoded, fill one or more OFDM symbols up to a boundary within a last OFDM symbol. The information bits and the first padding bits are encoded to generate coded bits. After encoding, coded bits corresponding to the last OFDM symbol are padded, or constellation points generated based on the coded bits corresponding to the last OFDM symbol are padded, such that the padded coded bits or the padded constellation points occupy a remaining portion of the last OFDM symbol after the boundary. The last OFDM symbol of the data portion is generated to include the coded information bits corresponding to the last OFDM symbol, the first padding bits and second padding bits or padding constellation points added after encoding.
107 Citations
16 Claims
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1. A method for generating a physical layer (PHY) data unit for transmission via a communication channel, the method comprising:
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receiving a plurality of information bits to be included in a data portion of the PHY data unit; adding one or more first padding bits to the information bits such that the information bits, after being encoded, fill one or more OFDM symbols up to a first portion of a last OFDM symbol, wherein the first portion of the last OFDM symbol is an initial portion of the last OFDM symbol up to a boundary within the last OFDM symbol, and wherein the method includes determining a number of excess information bits, of the plurality of information bits, to be included in the last OFDM symbol, and selecting a boundary value of the boundary within the last OFDM symbol based on the determined number of excess information bits; encoding the information bits and the first padding bits to generate coded bits; performing one of (i) adding one or more second padding bits to the coded bits corresponding to the last OFDM symbol or (ii) adding one or more padding constellation points to a set of constellation points generated based on the coded bits corresponding to the last OFDM symbol such that the padded coded bits or the padded constellation points occupy a second portion of the last OFDM symbol, wherein the second portion is a remaining portion of the last OFDM symbol after the boundary; and generating the one or more OFDM symbols, including generating the last OFDM symbol to include (i) the coded information bits corresponding to the last OFDM symbol, (ii) the coded first padding bits in the first portion of the last OFDM symbol to allow a receiving device to stop decoding the one or more OFDM symbols after decoding the first portion of the last OFDM symbol, and (iii) the one or more second padding bits or the one or more padding constellation points in the second portion of the last OFDM symbol; and generating the PHY data unit to include at least the one or more OFDM symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus, comprising:
a network interface device having one or more integrated circuits configured to receive a plurality of information bits to be included in a data portion of a physical layer (PHY) data unit; add one or more first padding bits to the information bits such that the information bits, after being encoded, fill one or more OFDM symbols up to a first portion of a last OFDM symbol, wherein the first portion of the last OFDM symbol is an initial portion of the last OFDM symbol up to a boundary within the last OFDM symbol, and wherein the one or more integrated circuits are configured to determine a number of excess information bits, of the plurality of information bits, to be included in the last OFDM symbol, and select a boundary value of the boundary within the last OFDM symbol based on the determined number of excess information bits; encode the information bits and the first padding bits to generate coded bits; perform one of (i) adding one or more second padding bits to the coded bits corresponding to the last OFDM symbol or (ii) adding one or more padding constellation points to a set of constellation points generated based on the coded bits corresponding to the last OFDM symbol such that the padded coded bits or the padded constellation points occupy a second portion of the last OFDM symbol, wherein the second portion is a remaining portion of the last OFDM symbol after the boundary; and generate the one or more OFDM symbols, including generating the last OFDM symbol to include (i) the coded information bits corresponding to the last OFDM symbol, (ii) the coded first padding bits in the first portion of the last OFDM symbol to allow a receiving device to stop decoding the one or more OFDM symbols after decoding the first portion of the last OFDM symbol, and (iii) the one or more second padding bits or the one or more padding constellation points in the second portion of the last OFDM symbol; and generate the PHY data unit to include at least the one or more OFDM symbols. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
Specification