Telecommunication system and related methods

A method of encoding data for transmission across a telecommunication channel, the method comprising:

• forming a frame by encoding and modulating a message block from a quantity of data to be included in a data payload of the frame using a modulation format and a short-block LDPC code associated with a modulation/code pair (ModCod) selected from a table of ModCods,
• Message Block Size
• ModCod
• Modulation
• Code Rate
• (bits)
• 0
• BPSK
• 0.488
• 2k
• 1
• QPSK
• 0.533
• 4.1k
• 2
• QPSK
• 0.631
• 4.1k
• 3
• QPSK
• 0.706
• 4.1k
• 4
• QPSK
• 0.803
• 4.1k
• 5
• 8-QAM
• 0.642
• 6.1k
• 6
• 8-QAM
• 0.711
• 6.1k
• 7
• 8-QAM
• 0.780
• 6.1k
• 8
• 16-QAM
• 0.731
• 8.2k
• 9
• 16-QAM
• 0.780
• 8.2k
• 10
• 16-QAM
• 0.829
• 8.2k
• 11
• 16-QAM
• 0.853
• 8.2k

A method of transmitting data using adaptive coding and modulation, the method comprising:

• forming a first frame of a plurality of frames by:
• encoding a first message block from a quantity of data to be included in a data payload of the first frame using a first short-block low density parity check (LDPC) code and an encoder to form a first short encoded block;
• modulating the first short encoded block using a first modulation format and a modulator to form a first modulated short encoded block;
• including the first modulated short encoded block in the data payload of the first frame;
• and
• forming a first preamble including a first codeword including a first ModCod and an overhead channel bit value, the ModCod including information relating to the first modulation format and the first short-block LDPC code used to encode the first message block and to modulate the first modulated short encoded block, and the overhead channel bit value adapted to transmit data relating to one or more channel quality metrics through an overhead channel;
• and
• transmitting the first frame of the plurality of frames into a telecommunication channel with a transmitter;
• receiving data relating to one or more channel quality metrics through the overhead channel;
• determining that at least one of the modulation format and the short-block LDPC code used to form frames of the plurality of frames subsequent to the first frame should be changed using the data relating to the one or more channel quality metrics;
• forming a second frame of the plurality of frames by:
• encoding a second message block from a quantity of data to be included in a data payload of the second frame using a second short-block LDPC code and the encoder to form a second short encoded block;
• modulating the second short encoded block using a second modulation format and the modulator to form a second modulated short encoded block wherein at least one of the second short-block LDPC code and the second modulation format is different from the respective first short-block LDPC code and the first modulation format;
• including the second modulated short encoded block in the data payload of the second frame;
• and
• forming a second preamble including a second codeword including a second ModCod and a second overhead channel bit value, the second ModCod including information relating to the second modulation format and the second short-block LDPC code used to encode the second message block and to modulate the second modulated short encoded block, where the second ModCod is different than the first ModCod, and where the second overhead channel bit value is adapted to transmit data relating to one or more channel quality metrics through the overhead channel;
• and
• transmitting the second frame of the plurality of frames into the telecommunication channel with a transmitter;
• wherein the first modulated short encoded block in the first frame and the second modulated short encoded block in the second frame have the same number of symbols.

A transmission system for encoding and modulating data for transmission across a telecommunication channel, the transmission system comprising:

• an encoder adapted to receive a message block from a quantity of data to be included in a data payload of a frame of a plurality of frames and to encode the message block using a short-block low density parity check (LDPC) code to form a short encoded block;
• a modulator coupled to the encoder and adapted to receive the short encoded block;
• to modulate the short encoded block using a modulation format to form a modulated short encoded block, the modulated short encoded block comprising a plurality of symbols;
• and to include the modulated short encoded block in a data payload included in the frame;
• and
• a transmitter coupled to the modulator and adapted to send the frame into the telecommunication channel;
• wherein each modulated short encoded block in the data payload of each of the plurality of frames has a constant number of symbols;
• and
• wherein each frame of the plurality of frames includes a preamble including a modulation/code pair (ModCod) comprising information relating to the modulation format and the short-block LDPC code used to encode the message block and to modulate the short encoded block.