Coding scheme for a wireless communication system

In an orthogonal frequency division modulation (OFDM) communication system, a method for preparing data for transmission on a plurality of transmission channels, wherein each transmission channel is operative to transmit a respective sequence of modulation symbols, the method comprising:

• determining a number of information bits per modulation symbol supported by each transmission channel;
• identifying a modulation scheme for each transmission channel such that the determined number of information bits per modulation symbol is supported;
• determining a coding rate for each transmission channel based at least on the determined number of information bits per modulation symbol and the identified modulation scheme for the transmission channel, wherein at least two transmission channels are associated with different coding rates;
• encoding a plurality of information bits in accordance with a particular Turbo code to provide a plurality of tail and parity bits;
• interleaving the plurality of information and tail and parity bits in accordance with a particular interleaving scheme;
• puncturing the plurality of interleaved bits in accordance with a particular puncturing scheme to provide a number of unpunctured coded bits for the plurality of transmission channels, wherein the puncturing is adjusted to achieve the different coding rates for the at least two transmission channels;
• forming non-binary symbols for the plurality of transmission channels, wherein each non-binary symbol includes a group of unpunctured coded bits;
• and
• mapping each non-binary symbol to a respective modulation symbol.

A communication system configured to prepare data for transmission on a plurality of transmission channels, each transmission channel being operative to transmit a respective sequence of modulation symbols, the system comprising:

• means for determining a number of information bits per modulation symbol supported by each transmission channel;
• means for identifying a modulation scheme for each transmission channel such that the determined number of information bits per modulation symbol is supported;
• means for determining a coding rate for each transmission channel based at least on the determined number of information bits per modulation symbol and the identified modulation scheme for the transmission channel, wherein at least two transmission channels are associated with different coding rates;
• means for encoding a plurality of information bits in accordance with a particular encoding scheme to provide a plurality of coded bits;
• means for puncturing the plurality of coded bits in accordance with a particular puncturing scheme to provide a number of unpunctured coded bits for the plurality of transmission channels;
• and
• means for adjusting the puncturing to achieve the different coding rates for the at least two transmission channels.

A communication system configured to prepare data for transmission on a plurality of transmission channels, each transmission channel being operative to transmit a respective sequence of modulation symbols, the system comprising:

• means for determining a number of information bits per modulation symbol supported by each transmission channel;
• means for identifying a modulation scheme for each transmission channel such that the determined number of information bits per modulation symbol is supported;
• means for determining a coding rate for each transmission channel based at least on the determined number of information bits per modulation symbol and the identified modulation scheme for the transmission channel, wherein at least two transmission channels are associated with different coding rates;
• means for encoding a plurality of information bits in accordance with a particular Turbo code to provide a plurality of tail and parity bits;
• means for interleaving the plurality of information and tail and parity bits in accordance with a particular interleaving scheme;
• means for puncturing the plurality of interleaved bits in accordance with a particular puncturing scheme to provide a number of unpunctured coded bits for the plurality of transmission channels, wherein the puncturing is adjusted to achieve the different coding rates for the at least two transmission channels;
• means for forming non-binary symbols for the plurality of transmission channels, wherein each non-binary symbol includes a group of unpunctured coded bits;
• and
• means for mapping each non-binary symbol to a respective modulation symbol.

A communication system configured to prepare data for transmission on a plurality of transmission channels, each transmission channel operative to transmit a respective sequence of modulation symbols, the system comprising a processor and a memory, the memory embodying instructions executable by the processor to:

• determine a number of information bits per modulation symbol supported by each transmission channel;
• identify a modulation scheme for each transmission channel such that the determined number of information bits per modulation symbol is supported;
• determine a coding rate for each transmission channel based at least on the determined number of information bits per modulation symbol and the identified modulation scheme for the transmission channel, wherein at least two transmission channels are associated with different coding rates;
• encode a plurality of information bits in accordance with a particular encoding scheme to provide a plurality of coded bits;
• puncture the plurality of coded bits in accordance with a particular puncturing scheme to provide a number of unpunctured coded bits for the plurality of transmission channels;
• and
• adjust the puncturing to achieve the different coding rates for the at least two transmission channels.

A communication system configured to prepare data for transmission on a plurality of transmission channels, each transmission channel operative to transmit a respective sequence of modulation symbols, the system comprising a processor and a memory, the memory embodying instructions executable by the processor to:

• determine a number of information bits per modulation symbol supported by each transmission channel;
• identify a modulation scheme for each transmission channel such that the determined number of information bits per modulation symbol is supported;
• determine a coding rate for each transmission channel based at least on the determined number of information bits per modulation symbol and the identified modulation scheme for the transmission channel, wherein at least two transmission channels are associated with different coding rates;
• encode a plurality of information bits in accordance with a particular Turbo code to provide a plurality of tail and parity bits;
• interleave the plurality of information and tail and parity bits in accordance with a particular interleaving scheme;
• puncture the plurality of interleaved bits in accordance with a particular puncturing scheme to provide a number of unpunctured coded bits for the plurality of transmission channels, wherein the puncturing is adjusted to achieve the different coding rates for the at least two transmission channels;
• form non-binary symbols for the plurality of transmission channels, wherein each non-binary symbol includes a group of unpunctured coded bits;
• and
• map each non-binary symbol to a respective modulation symbol.