Modulation scheme for communication environments
First Claim
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1. A method comprising:
- receiving a bit stream,generating a coded bit stream of N bits by encoding a first portion of K bits of the bit stream using low density parity check coding technique and an un-coded bit stream of N/3 bits from a second portion of the bit stream,producing a combination by selecting at least N1 bits from the coded bit stream and N1/3 bits from the un-coded bit stream;
determining a symbol, using a pulse amplitude modulation PAM-16 scheme, corresponding to the combination from a symbol set comprising at least sixteen symbols, wherein information bits in each symbol is based on a code rate determined using size of the first portion and size of the coded bit stream; and
transmitting a signal corresponding to the symbol at a rate of at least 10 giga bits per second over a communication medium.
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Abstract
According to an aspect of the present invention, a symbol corresponding to a combination may be determined from a symbol set comprising at least sixteen PAM symbols. A sample such as a pulse may be generated based on the symbol value and a train of such pulses may be transmitted at a rate of at least 10 giga bits per second over a communication medium comprising, for example, a twisted copper cable. The received signal may be demodulated based on the empirically determined reliability values.
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Citations
24 Claims
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1. A method comprising:
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receiving a bit stream, generating a coded bit stream of N bits by encoding a first portion of K bits of the bit stream using low density parity check coding technique and an un-coded bit stream of N/3 bits from a second portion of the bit stream, producing a combination by selecting at least N1 bits from the coded bit stream and N1/3 bits from the un-coded bit stream; determining a symbol, using a pulse amplitude modulation PAM-16 scheme, corresponding to the combination from a symbol set comprising at least sixteen symbols, wherein information bits in each symbol is based on a code rate determined using size of the first portion and size of the coded bit stream; and transmitting a signal corresponding to the symbol at a rate of at least 10 giga bits per second over a communication medium. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus comprising:
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a transmitter is arranged to receive an input bit stream, to generate a coded bit stream of N bits by encoding a first portion of K bits of the input bit stream using low density parity check coding technique and an un-coded bit stream of N/3 bits a second portion of the input bit stream, and to produce a combination by selecting at least N1 bits from the coded bit stream and N1/3 bits from the un-coded bit stream, to determine a symbol, using a pulse amplitude modulation PAM-16 scheme, corresponding to the combination from a symbol set, wherein the symbol set comprises at least sixteen symbols, wherein information bits in each symbol is based on a code rate determined using size of the first portion and size of the coded bit stream, a receiver to demodulate based on a reliability assignment, and a front end device to transmit a signal corresponding to the symbol at a rate of at least 10 giga bits per second over a communication medium. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. A system comprising:
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a network interface to generate and transfer a signal that is representative of a bit stream and that comprises symbols selected from at least one of sixteen symbols, a processor to provide the network interface with the bit stream in response to executing instructions, a memory to store the instructions executed by the processor, the network interface further comprises a transmitter to receive a bit stream, to generate a coded bit stream of N bits by encoding a first portion of K bits of the input bit stream using low density parity check coding technique and an un-coded bit stream of N/3 bits from a second portion of the bit stream and to produce a combination by selecting at least N1 bits from the coded bit stream and N1/3 bits from the un-coded bit stream, to determine a symbol, using a pulse amplitude modulation PAM-16 scheme, corresponding to the combination from a symbol set, wherein the symbol set comprises at least sixteen symbols, wherein information bits in each symbol is based on a code rate determined using size of the first portion and size of the coded bit stream, and a front end device to transmit a signal corresponding to the symbol at a rate of at least 10 giga bits per second over a communication medium. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification