Low-density parity-check (LPDC) coded modulation (LCM) with alignment of LDPC codewords and discrete multi-tone (DMT) symbol boundaries
OwnerRainer Strobel, Vladimir Oksmaninventors
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Abstract
A system for a digital subscriber line (DSL) network with a DSL interface can operate with processing circuitry that can generate symbols in multicarrier communications with codewords for modulation of a parity check. The codewords can be aligned with symbol boundaries of the symbols in a continuous transmission of the multi-carrier communications. The processing circuitry reduces a number of parity bits by puncturing and a number of data bits for shortening of the codewords so that a codeword boundary is aligned with a symbol boundary for one or more symbols, or a transmission frame of symbols.
Claims22
An apparatus employed in a digital subscriber line (DSL) network comprising:
- processing circuitry, comprising a memory with executable instructions, configured to:
- generate a plurality of symbols of multi-carrier communications that comprises frames in a continuous transmission and codewords derived from block codes to enable a modulation for a parity check;
- and
- align the codewords with a symbol boundary of the plurality of symbols based on one or more code settings;
- a DSL interface, configured to provide, to communication circuitry, data for a transmission of the plurality of symbols, wherein the plurality of symbols comprises discrete multi-tone (DMT) symbols or orthogonal frequency-division multiplexing (OFDM) symbols.
A system employed in a digital subscriber line (DSL) network comprising:
- processing circuitry, comprising a memory with executable instructions, configured to:
- process multi-carrier communications comprising a plurality of discrete multi-tone (DMT) symbols;
- and
- align low-density parity-check (LDPC) codewords with one or more DMT symbol boundaries of the plurality of DMT symbols in the multicarrier communications based on a set of settings for puncturing a number of parity bits and shortening a number of data bits of the LDPC codewords;
- a DSL interface, configured to provide, to communication circuitry, data for a transmission of the DMT symbols.
A computer readable storage medium storing executable instructions that, in response to execution, cause one or more processors of a DSL device to perform operations for multi-carrier communications, the operations comprising:
- generating symbols with low-density parity-check (LDPC) codewords that enable LDPC coded modulation (LCM);
- aligning the LDPC codewords with one or more symbol boundaries of the symbols so that an LDPC codeword boundary aligns with a symbol boundary within a continuous transmission for the multi-carrier communications;
- and
- transmitting the aligned LDPC codewords in the continuous transmission, wherein a number of bits varies among the symbols.
Dependencies are inferred from the claim text.